1 /*
2 * Wi-Fi Direct - P2P Invitation procedure
3 * Copyright (c) 2010, 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/wpa_ctrl.h"
14 #include "p2p_i.h"
15 #include "p2p.h"
16
17
p2p_build_invitation_req(struct p2p_data * p2p,struct p2p_device * peer,const u8 * go_dev_addr,int dev_pw_id)18 static struct wpabuf * p2p_build_invitation_req(struct p2p_data *p2p,
19 struct p2p_device *peer,
20 const u8 *go_dev_addr,
21 int dev_pw_id)
22 {
23 struct wpabuf *buf;
24 u8 *len;
25 const u8 *dev_addr;
26 size_t extra = 0;
27
28 #ifdef CONFIG_WIFI_DISPLAY
29 struct wpabuf *wfd_ie = p2p->wfd_ie_invitation;
30 if (wfd_ie && p2p->inv_role == P2P_INVITE_ROLE_ACTIVE_GO) {
31 size_t i;
32 for (i = 0; i < p2p->num_groups; i++) {
33 struct p2p_group *g = p2p->groups[i];
34 struct wpabuf *ie;
35 if (os_memcmp(p2p_group_get_interface_addr(g),
36 p2p->inv_bssid, ETH_ALEN) != 0)
37 continue;
38 ie = p2p_group_get_wfd_ie(g);
39 if (ie) {
40 wfd_ie = ie;
41 break;
42 }
43 }
44 }
45 if (wfd_ie)
46 extra = wpabuf_len(wfd_ie);
47 #endif /* CONFIG_WIFI_DISPLAY */
48
49 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_INV_REQ])
50 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_INV_REQ]);
51
52 buf = wpabuf_alloc(1000 + extra);
53 if (buf == NULL)
54 return NULL;
55
56 peer->dialog_token++;
57 if (peer->dialog_token == 0)
58 peer->dialog_token = 1;
59 p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_REQ,
60 peer->dialog_token);
61
62 len = p2p_buf_add_ie_hdr(buf);
63 if (p2p->inv_role == P2P_INVITE_ROLE_ACTIVE_GO || !p2p->inv_persistent)
64 p2p_buf_add_config_timeout(buf, 0, 0);
65 else
66 p2p_buf_add_config_timeout(buf, p2p->go_timeout,
67 p2p->client_timeout);
68 p2p_buf_add_invitation_flags(buf, p2p->inv_persistent ?
69 P2P_INVITATION_FLAGS_TYPE : 0);
70 if (p2p->inv_role != P2P_INVITE_ROLE_CLIENT ||
71 !(peer->flags & P2P_DEV_NO_PREF_CHAN))
72 p2p_buf_add_operating_channel(buf, p2p->cfg->country,
73 p2p->op_reg_class,
74 p2p->op_channel);
75 if (p2p->inv_bssid_set)
76 p2p_buf_add_group_bssid(buf, p2p->inv_bssid);
77 p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels);
78 if (go_dev_addr)
79 dev_addr = go_dev_addr;
80 else if (p2p->inv_role == P2P_INVITE_ROLE_CLIENT)
81 dev_addr = peer->info.p2p_device_addr;
82 else
83 dev_addr = p2p->cfg->dev_addr;
84 p2p_buf_add_group_id(buf, dev_addr, p2p->inv_ssid, p2p->inv_ssid_len);
85 p2p_buf_add_device_info(buf, p2p, peer);
86 p2p_buf_update_ie_hdr(buf, len);
87
88 p2p_buf_add_pref_channel_list(buf, p2p->pref_freq_list,
89 p2p->num_pref_freq);
90
91 #ifdef CONFIG_WIFI_DISPLAY
92 if (wfd_ie)
93 wpabuf_put_buf(buf, wfd_ie);
94 #endif /* CONFIG_WIFI_DISPLAY */
95
96 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_INV_REQ])
97 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_INV_REQ]);
98
99 if (dev_pw_id >= 0) {
100 /* WSC IE in Invitation Request for NFC static handover */
101 p2p_build_wps_ie(p2p, buf, dev_pw_id, 0);
102 }
103
104 return buf;
105 }
106
107
p2p_build_invitation_resp(struct p2p_data * p2p,struct p2p_device * peer,u8 dialog_token,u8 status,const u8 * group_bssid,u8 reg_class,u8 channel,struct p2p_channels * channels)108 static struct wpabuf * p2p_build_invitation_resp(struct p2p_data *p2p,
109 struct p2p_device *peer,
110 u8 dialog_token, u8 status,
111 const u8 *group_bssid,
112 u8 reg_class, u8 channel,
113 struct p2p_channels *channels)
114 {
115 struct wpabuf *buf;
116 u8 *len;
117 size_t extra = 0;
118
119 #ifdef CONFIG_WIFI_DISPLAY
120 struct wpabuf *wfd_ie = p2p->wfd_ie_invitation;
121 if (wfd_ie && group_bssid) {
122 size_t i;
123 for (i = 0; i < p2p->num_groups; i++) {
124 struct p2p_group *g = p2p->groups[i];
125 struct wpabuf *ie;
126 if (os_memcmp(p2p_group_get_interface_addr(g),
127 group_bssid, ETH_ALEN) != 0)
128 continue;
129 ie = p2p_group_get_wfd_ie(g);
130 if (ie) {
131 wfd_ie = ie;
132 break;
133 }
134 }
135 }
136 if (wfd_ie)
137 extra = wpabuf_len(wfd_ie);
138 #endif /* CONFIG_WIFI_DISPLAY */
139
140 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_INV_RESP])
141 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_INV_RESP]);
142
143 buf = wpabuf_alloc(1000 + extra);
144 if (buf == NULL)
145 return NULL;
146
147 p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_RESP,
148 dialog_token);
149
150 len = p2p_buf_add_ie_hdr(buf);
151 p2p_buf_add_status(buf, status);
152 p2p_buf_add_config_timeout(buf, 0, 0); /* FIX */
153 if (reg_class && channel)
154 p2p_buf_add_operating_channel(buf, p2p->cfg->country,
155 reg_class, channel);
156 if (group_bssid)
157 p2p_buf_add_group_bssid(buf, group_bssid);
158 if (channels)
159 p2p_buf_add_channel_list(buf, p2p->cfg->country, channels);
160 p2p_buf_update_ie_hdr(buf, len);
161
162 #ifdef CONFIG_WIFI_DISPLAY
163 if (wfd_ie)
164 wpabuf_put_buf(buf, wfd_ie);
165 #endif /* CONFIG_WIFI_DISPLAY */
166
167 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_INV_RESP])
168 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_INV_RESP]);
169
170 return buf;
171 }
172
173
p2p_process_invitation_req(struct p2p_data * p2p,const u8 * sa,const u8 * data,size_t len,int rx_freq)174 void p2p_process_invitation_req(struct p2p_data *p2p, const u8 *sa,
175 const u8 *data, size_t len, int rx_freq)
176 {
177 struct p2p_device *dev;
178 struct p2p_message msg;
179 struct wpabuf *resp = NULL;
180 u8 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
181 int freq;
182 int go = 0;
183 u8 group_bssid[ETH_ALEN], *bssid;
184 int op_freq = 0;
185 u8 reg_class = 0, channel = 0;
186 struct p2p_channels all_channels, intersection, *channels = NULL;
187 int persistent;
188
189 os_memset(group_bssid, 0, sizeof(group_bssid));
190
191 p2p_dbg(p2p, "Received Invitation Request from " MACSTR " (freq=%d)",
192 MAC2STR(sa), rx_freq);
193
194 if (p2p_parse(data, len, &msg))
195 return;
196
197 dev = p2p_get_device(p2p, sa);
198 if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) {
199 p2p_dbg(p2p, "Invitation Request from unknown peer " MACSTR,
200 MAC2STR(sa));
201
202 if (p2p_add_device(p2p, sa, rx_freq, NULL, 0, data + 1, len - 1,
203 0)) {
204 p2p_dbg(p2p, "Invitation Request add device failed "
205 MACSTR, MAC2STR(sa));
206 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
207 goto fail;
208 }
209
210 dev = p2p_get_device(p2p, sa);
211 if (dev == NULL) {
212 p2p_dbg(p2p, "Reject Invitation Request from unknown peer "
213 MACSTR, MAC2STR(sa));
214 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
215 goto fail;
216 }
217 }
218
219 if (!msg.group_id || !msg.channel_list) {
220 p2p_dbg(p2p, "Mandatory attribute missing in Invitation Request from "
221 MACSTR, MAC2STR(sa));
222 status = P2P_SC_FAIL_INVALID_PARAMS;
223 goto fail;
224 }
225
226 if (msg.invitation_flags)
227 persistent = *msg.invitation_flags & P2P_INVITATION_FLAGS_TYPE;
228 else {
229 /* Invitation Flags is a mandatory attribute starting from P2P
230 * spec 1.06. As a backwards compatibility mechanism, assume
231 * the request was for a persistent group if the attribute is
232 * missing.
233 */
234 p2p_dbg(p2p, "Mandatory Invitation Flags attribute missing from Invitation Request");
235 persistent = 1;
236 }
237
238 p2p_channels_union(&p2p->cfg->channels, &p2p->cfg->cli_channels,
239 &all_channels);
240
241 if (p2p_peer_channels_check(p2p, &all_channels, dev,
242 msg.channel_list, msg.channel_list_len) <
243 0) {
244 p2p_dbg(p2p, "No common channels found");
245 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
246 goto fail;
247 }
248
249 p2p_channels_dump(p2p, "own channels", &p2p->cfg->channels);
250 p2p_channels_dump(p2p, "own client channels", &all_channels);
251 p2p_channels_dump(p2p, "peer channels", &dev->channels);
252 p2p_channels_intersect(&all_channels, &dev->channels,
253 &intersection);
254 p2p_channels_dump(p2p, "intersection", &intersection);
255
256 if (p2p->cfg->invitation_process) {
257 status = p2p->cfg->invitation_process(
258 p2p->cfg->cb_ctx, sa, msg.group_bssid, msg.group_id,
259 msg.group_id + ETH_ALEN, msg.group_id_len - ETH_ALEN,
260 &go, group_bssid, &op_freq, persistent, &intersection,
261 msg.dev_password_id_present ? msg.dev_password_id : -1);
262 }
263
264 if (go) {
265 p2p_channels_intersect(&p2p->cfg->channels, &dev->channels,
266 &intersection);
267 p2p_channels_dump(p2p, "intersection(GO)", &intersection);
268 if (intersection.reg_classes == 0) {
269 p2p_dbg(p2p, "No common channels found (GO)");
270 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
271 goto fail;
272 }
273 }
274
275 if (op_freq) {
276 p2p_dbg(p2p, "Invitation processing forced frequency %d MHz",
277 op_freq);
278 if (p2p_freq_to_channel(op_freq, ®_class, &channel) < 0) {
279 p2p_dbg(p2p, "Unknown forced freq %d MHz from invitation_process()",
280 op_freq);
281 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
282 goto fail;
283 }
284
285 if (!p2p_channels_includes(&intersection, reg_class, channel))
286 {
287 p2p_dbg(p2p, "forced freq %d MHz not in the supported channels intersection",
288 op_freq);
289 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
290 goto fail;
291 }
292
293 if (status == P2P_SC_SUCCESS)
294 channels = &intersection;
295 } else {
296 p2p_dbg(p2p, "No forced channel from invitation processing - figure out best one to use");
297
298 /* Default to own configuration as a starting point */
299 p2p->op_reg_class = p2p->cfg->op_reg_class;
300 p2p->op_channel = p2p->cfg->op_channel;
301 p2p_dbg(p2p, "Own default op_class %d channel %d",
302 p2p->op_reg_class, p2p->op_channel);
303
304 /* Use peer preference if specified and compatible */
305 if (msg.operating_channel) {
306 int req_freq;
307 req_freq = p2p_channel_to_freq(
308 msg.operating_channel[3],
309 msg.operating_channel[4]);
310 p2p_dbg(p2p, "Peer operating channel preference: %d MHz",
311 req_freq);
312 if (req_freq > 0 &&
313 p2p_channels_includes(&intersection,
314 msg.operating_channel[3],
315 msg.operating_channel[4])) {
316 p2p->op_reg_class = msg.operating_channel[3];
317 p2p->op_channel = msg.operating_channel[4];
318 p2p_dbg(p2p, "Use peer preference op_class %d channel %d",
319 p2p->op_reg_class, p2p->op_channel);
320 } else {
321 p2p_dbg(p2p, "Cannot use peer channel preference");
322 }
323 }
324
325 /* Reselect the channel only for the case of the GO */
326 if (go &&
327 !p2p_channels_includes(&intersection, p2p->op_reg_class,
328 p2p->op_channel)) {
329 p2p_dbg(p2p, "Initially selected channel (op_class %d channel %d) not in channel intersection - try to reselect",
330 p2p->op_reg_class, p2p->op_channel);
331 p2p_reselect_channel(p2p, &intersection);
332 p2p_dbg(p2p, "Re-selection result: op_class %d channel %d",
333 p2p->op_reg_class, p2p->op_channel);
334 if (!p2p_channels_includes(&intersection,
335 p2p->op_reg_class,
336 p2p->op_channel)) {
337 p2p_dbg(p2p, "Peer does not support selected operating channel (reg_class=%u channel=%u)",
338 p2p->op_reg_class, p2p->op_channel);
339 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
340 goto fail;
341 }
342 } else if (go && !(dev->flags & P2P_DEV_FORCE_FREQ) &&
343 !p2p->cfg->cfg_op_channel) {
344 p2p_dbg(p2p, "Try to reselect channel selection with peer information received; previously selected op_class %u channel %u",
345 p2p->op_reg_class, p2p->op_channel);
346 p2p_reselect_channel(p2p, &intersection);
347 }
348
349 /*
350 * Use the driver preferred frequency list extension if
351 * supported.
352 */
353 p2p_check_pref_chan(p2p, go, dev, &msg);
354
355 op_freq = p2p_channel_to_freq(p2p->op_reg_class,
356 p2p->op_channel);
357 if (op_freq < 0) {
358 p2p_dbg(p2p, "Unknown operational channel (country=%c%c reg_class=%u channel=%u)",
359 p2p->cfg->country[0], p2p->cfg->country[1],
360 p2p->op_reg_class, p2p->op_channel);
361 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
362 goto fail;
363 }
364 p2p_dbg(p2p, "Selected operating channel - %d MHz", op_freq);
365
366 if (status == P2P_SC_SUCCESS) {
367 reg_class = p2p->op_reg_class;
368 channel = p2p->op_channel;
369 channels = &intersection;
370 }
371 }
372
373 fail:
374 if (go && status == P2P_SC_SUCCESS && !is_zero_ether_addr(group_bssid))
375 bssid = group_bssid;
376 else
377 bssid = NULL;
378 resp = p2p_build_invitation_resp(p2p, dev, msg.dialog_token, status,
379 bssid, reg_class, channel, channels);
380
381 if (resp == NULL)
382 goto out;
383
384 if (rx_freq > 0)
385 freq = rx_freq;
386 else
387 freq = p2p_channel_to_freq(p2p->cfg->reg_class,
388 p2p->cfg->channel);
389 if (freq < 0) {
390 p2p_dbg(p2p, "Unknown regulatory class/channel");
391 goto out;
392 }
393
394 /*
395 * Store copy of invitation data to be used when processing TX status
396 * callback for the Acton frame.
397 */
398 os_memcpy(p2p->inv_sa, sa, ETH_ALEN);
399 if (msg.group_bssid) {
400 os_memcpy(p2p->inv_group_bssid, msg.group_bssid, ETH_ALEN);
401 p2p->inv_group_bssid_ptr = p2p->inv_group_bssid;
402 } else
403 p2p->inv_group_bssid_ptr = NULL;
404 if (msg.group_id) {
405 if (msg.group_id_len - ETH_ALEN <= SSID_MAX_LEN) {
406 os_memcpy(p2p->inv_ssid, msg.group_id + ETH_ALEN,
407 msg.group_id_len - ETH_ALEN);
408 p2p->inv_ssid_len = msg.group_id_len - ETH_ALEN;
409 }
410 os_memcpy(p2p->inv_go_dev_addr, msg.group_id, ETH_ALEN);
411 } else {
412 p2p->inv_ssid_len = 0;
413 os_memset(p2p->inv_go_dev_addr, 0, ETH_ALEN);
414 }
415 p2p->inv_status = status;
416 p2p->inv_op_freq = op_freq;
417
418 p2p->pending_action_state = P2P_PENDING_INVITATION_RESPONSE;
419 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr,
420 p2p->cfg->dev_addr,
421 wpabuf_head(resp), wpabuf_len(resp), 50) < 0) {
422 p2p_dbg(p2p, "Failed to send Action frame");
423 }
424
425 out:
426 wpabuf_free(resp);
427 p2p_parse_free(&msg);
428 }
429
430
p2p_process_invitation_resp(struct p2p_data * p2p,const u8 * sa,const u8 * data,size_t len)431 void p2p_process_invitation_resp(struct p2p_data *p2p, const u8 *sa,
432 const u8 *data, size_t len)
433 {
434 struct p2p_device *dev;
435 struct p2p_message msg;
436 struct p2p_channels intersection, *channels = NULL;
437
438 p2p_dbg(p2p, "Received Invitation Response from " MACSTR,
439 MAC2STR(sa));
440
441 dev = p2p_get_device(p2p, sa);
442 if (dev == NULL) {
443 p2p_dbg(p2p, "Ignore Invitation Response from unknown peer "
444 MACSTR, MAC2STR(sa));
445 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
446 return;
447 }
448
449 if (dev != p2p->invite_peer) {
450 p2p_dbg(p2p, "Ignore unexpected Invitation Response from peer "
451 MACSTR, MAC2STR(sa));
452 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
453 return;
454 }
455
456 if (p2p_parse(data, len, &msg)) {
457 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
458 return;
459 }
460
461 if (!msg.status) {
462 p2p_dbg(p2p, "Mandatory Status attribute missing in Invitation Response from "
463 MACSTR, MAC2STR(sa));
464 p2p_parse_free(&msg);
465 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
466 return;
467 }
468
469 /*
470 * We should not really receive a replayed response twice since
471 * duplicate frames are supposed to be dropped. However, not all drivers
472 * do that for pre-association frames. We did not use to verify dialog
473 * token matches for invitation response frames, but that check can be
474 * safely used to drop a replayed response to the previous Invitation
475 * Request in case the suggested operating channel was changed. This
476 * allows a duplicated reject frame to be dropped with the assumption
477 * that the real response follows after it.
478 */
479 if (*msg.status == P2P_SC_FAIL_NO_COMMON_CHANNELS &&
480 p2p->retry_invite_req_sent &&
481 msg.dialog_token != dev->dialog_token) {
482 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)",
483 msg.dialog_token, dev->dialog_token);
484 p2p_parse_free(&msg);
485 return;
486 }
487
488 if (*msg.status == P2P_SC_FAIL_NO_COMMON_CHANNELS &&
489 p2p->retry_invite_req &&
490 p2p_channel_random_social(&p2p->cfg->channels, &p2p->op_reg_class,
491 &p2p->op_channel) == 0) {
492 p2p->retry_invite_req = 0;
493 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
494 p2p->cfg->stop_listen(p2p->cfg->cb_ctx);
495 p2p_set_state(p2p, P2P_INVITE);
496 p2p_dbg(p2p, "Resend Invitation Request setting op_class %u channel %u as operating channel",
497 p2p->op_reg_class, p2p->op_channel);
498 p2p->retry_invite_req_sent = 1;
499 p2p_invite_send(p2p, p2p->invite_peer, p2p->invite_go_dev_addr,
500 p2p->invite_dev_pw_id);
501 p2p_parse_free(&msg);
502 return;
503 }
504 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
505 p2p->retry_invite_req = 0;
506
507 if (!msg.channel_list && *msg.status == P2P_SC_SUCCESS) {
508 p2p_dbg(p2p, "Mandatory Channel List attribute missing in Invitation Response from "
509 MACSTR, MAC2STR(sa));
510 #ifdef CONFIG_P2P_STRICT
511 p2p_parse_free(&msg);
512 return;
513 #endif /* CONFIG_P2P_STRICT */
514 /* Try to survive without peer channel list */
515 channels = &p2p->channels;
516 } else if (!msg.channel_list) {
517 /* Non-success cases are not required to include Channel List */
518 channels = &p2p->channels;
519 } else if (p2p_peer_channels_check(p2p, &p2p->channels, dev,
520 msg.channel_list,
521 msg.channel_list_len) < 0) {
522 p2p_dbg(p2p, "No common channels found");
523 p2p_parse_free(&msg);
524 return;
525 } else {
526 p2p_channels_intersect(&p2p->channels, &dev->channels,
527 &intersection);
528 channels = &intersection;
529 }
530
531 if (p2p->cfg->invitation_result) {
532 int peer_oper_freq = 0;
533 int freq = p2p_channel_to_freq(p2p->op_reg_class,
534 p2p->op_channel);
535 if (freq < 0)
536 freq = 0;
537
538 if (msg.operating_channel) {
539 peer_oper_freq = p2p_channel_to_freq(
540 msg.operating_channel[3],
541 msg.operating_channel[4]);
542 if (peer_oper_freq < 0)
543 peer_oper_freq = 0;
544 }
545
546 /*
547 * Use the driver preferred frequency list extension if
548 * supported.
549 */
550 p2p_check_pref_chan(p2p, 0, dev, &msg);
551
552 p2p->cfg->invitation_result(p2p->cfg->cb_ctx, *msg.status,
553 msg.group_bssid, channels, sa,
554 freq, peer_oper_freq);
555 }
556
557 p2p_parse_free(&msg);
558
559 p2p_clear_timeout(p2p);
560 p2p_set_state(p2p, P2P_IDLE);
561 p2p->invite_peer = NULL;
562 }
563
564
p2p_invite_send(struct p2p_data * p2p,struct p2p_device * dev,const u8 * go_dev_addr,int dev_pw_id)565 int p2p_invite_send(struct p2p_data *p2p, struct p2p_device *dev,
566 const u8 *go_dev_addr, int dev_pw_id)
567 {
568 struct wpabuf *req;
569 int freq;
570
571 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq;
572 if (freq <= 0)
573 freq = dev->oob_go_neg_freq;
574 if (freq <= 0) {
575 p2p_dbg(p2p, "No Listen/Operating frequency known for the peer "
576 MACSTR " to send Invitation Request",
577 MAC2STR(dev->info.p2p_device_addr));
578 return -1;
579 }
580
581 req = p2p_build_invitation_req(p2p, dev, go_dev_addr, dev_pw_id);
582 if (req == NULL)
583 return -1;
584 if (p2p->state != P2P_IDLE)
585 p2p_stop_listen_for_freq(p2p, freq);
586 p2p_dbg(p2p, "Sending Invitation Request");
587 p2p_set_state(p2p, P2P_INVITE);
588 p2p->pending_action_state = P2P_PENDING_INVITATION_REQUEST;
589 p2p->invite_peer = dev;
590 dev->invitation_reqs++;
591 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr,
592 p2p->cfg->dev_addr, dev->info.p2p_device_addr,
593 wpabuf_head(req), wpabuf_len(req), 500) < 0) {
594 p2p_dbg(p2p, "Failed to send Action frame");
595 /* Use P2P find to recover and retry */
596 p2p_set_timeout(p2p, 0, 0);
597 } else {
598 dev->flags |= P2P_DEV_WAIT_INV_REQ_ACK;
599 }
600
601 wpabuf_free(req);
602
603 return 0;
604 }
605
606
p2p_invitation_req_cb(struct p2p_data * p2p,int success)607 void p2p_invitation_req_cb(struct p2p_data *p2p, int success)
608 {
609 p2p_dbg(p2p, "Invitation Request TX callback: success=%d", success);
610
611 if (p2p->invite_peer == NULL) {
612 p2p_dbg(p2p, "No pending Invite");
613 return;
614 }
615
616 if (success)
617 p2p->invite_peer->flags &= ~P2P_DEV_WAIT_INV_REQ_ACK;
618
619 /*
620 * Use P2P find, if needed, to find the other device from its listen
621 * channel.
622 */
623 p2p_set_state(p2p, P2P_INVITE);
624 p2p_set_timeout(p2p, 0, success ? 500000 : 100000);
625 }
626
627
p2p_invitation_resp_cb(struct p2p_data * p2p,int success)628 void p2p_invitation_resp_cb(struct p2p_data *p2p, int success)
629 {
630 p2p_dbg(p2p, "Invitation Response TX callback: success=%d", success);
631 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
632
633 if (!success)
634 p2p_dbg(p2p, "Assume Invitation Response was actually received by the peer even though Ack was not reported");
635
636 if (p2p->cfg->invitation_received) {
637 p2p->cfg->invitation_received(p2p->cfg->cb_ctx,
638 p2p->inv_sa,
639 p2p->inv_group_bssid_ptr,
640 p2p->inv_ssid, p2p->inv_ssid_len,
641 p2p->inv_go_dev_addr,
642 p2p->inv_status,
643 p2p->inv_op_freq);
644 }
645 }
646
647
p2p_invite(struct p2p_data * p2p,const u8 * peer,enum p2p_invite_role role,const u8 * bssid,const u8 * ssid,size_t ssid_len,unsigned int force_freq,const u8 * go_dev_addr,int persistent_group,unsigned int pref_freq,int dev_pw_id)648 int p2p_invite(struct p2p_data *p2p, const u8 *peer, enum p2p_invite_role role,
649 const u8 *bssid, const u8 *ssid, size_t ssid_len,
650 unsigned int force_freq, const u8 *go_dev_addr,
651 int persistent_group, unsigned int pref_freq, int dev_pw_id)
652 {
653 struct p2p_device *dev;
654
655 p2p_dbg(p2p, "Request to invite peer " MACSTR " role=%d persistent=%d "
656 "force_freq=%u",
657 MAC2STR(peer), role, persistent_group, force_freq);
658 if (bssid)
659 p2p_dbg(p2p, "Invitation for BSSID " MACSTR, MAC2STR(bssid));
660 if (go_dev_addr) {
661 p2p_dbg(p2p, "Invitation for GO Device Address " MACSTR,
662 MAC2STR(go_dev_addr));
663 os_memcpy(p2p->invite_go_dev_addr_buf, go_dev_addr, ETH_ALEN);
664 p2p->invite_go_dev_addr = p2p->invite_go_dev_addr_buf;
665 } else
666 p2p->invite_go_dev_addr = NULL;
667 wpa_hexdump_ascii(MSG_DEBUG, "Invitation for SSID",
668 ssid, ssid_len);
669 if (dev_pw_id >= 0) {
670 p2p_dbg(p2p, "Invitation to use Device Password ID %d",
671 dev_pw_id);
672 }
673 p2p->invite_dev_pw_id = dev_pw_id;
674 p2p->retry_invite_req = role == P2P_INVITE_ROLE_GO &&
675 persistent_group && !force_freq;
676 p2p->retry_invite_req_sent = 0;
677
678 dev = p2p_get_device(p2p, peer);
679 if (dev == NULL || (dev->listen_freq <= 0 && dev->oper_freq <= 0 &&
680 dev->oob_go_neg_freq <= 0)) {
681 p2p_dbg(p2p, "Cannot invite unknown P2P Device " MACSTR,
682 MAC2STR(peer));
683 return -1;
684 }
685
686 if (p2p_prepare_channel(p2p, dev, force_freq, pref_freq,
687 role != P2P_INVITE_ROLE_CLIENT) < 0)
688 return -1;
689
690 if (persistent_group && role == P2P_INVITE_ROLE_CLIENT && !force_freq &&
691 !pref_freq)
692 dev->flags |= P2P_DEV_NO_PREF_CHAN;
693 else
694 dev->flags &= ~P2P_DEV_NO_PREF_CHAN;
695
696 if (dev->flags & P2P_DEV_GROUP_CLIENT_ONLY) {
697 if (!(dev->info.dev_capab &
698 P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) {
699 p2p_dbg(p2p, "Cannot invite a P2P Device " MACSTR
700 " that is in a group and is not discoverable",
701 MAC2STR(peer));
702 }
703 /* TODO: use device discoverability request through GO */
704 }
705
706 dev->invitation_reqs = 0;
707
708 if (p2p->state != P2P_IDLE)
709 p2p_stop_find(p2p);
710
711 p2p->inv_role = role;
712 p2p->inv_bssid_set = bssid != NULL;
713 if (bssid)
714 os_memcpy(p2p->inv_bssid, bssid, ETH_ALEN);
715 os_memcpy(p2p->inv_ssid, ssid, ssid_len);
716 p2p->inv_ssid_len = ssid_len;
717 p2p->inv_persistent = persistent_group;
718 return p2p_invite_send(p2p, dev, go_dev_addr, dev_pw_id);
719 }
720