1 /*
2 * Wi-Fi Direct - P2P Group Owner Negotiation
3 * Copyright (c) 2009-2010, 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 "utils/eloop.h"
13 #include "common/ieee802_11_defs.h"
14 #include "common/wpa_ctrl.h"
15 #include "wps/wps_defs.h"
16 #include "p2p_i.h"
17 #include "p2p.h"
18
19
p2p_go_det(u8 own_intent,u8 peer_value)20 static int p2p_go_det(u8 own_intent, u8 peer_value)
21 {
22 u8 peer_intent = peer_value >> 1;
23 if (own_intent == peer_intent) {
24 if (own_intent == P2P_MAX_GO_INTENT)
25 return -1; /* both devices want to become GO */
26
27 /* Use tie breaker bit to determine GO */
28 return (peer_value & 0x01) ? 0 : 1;
29 }
30
31 return own_intent > peer_intent;
32 }
33
34
p2p_peer_channels_check(struct p2p_data * p2p,struct p2p_channels * own,struct p2p_device * dev,const u8 * channel_list,size_t channel_list_len)35 int p2p_peer_channels_check(struct p2p_data *p2p, struct p2p_channels *own,
36 struct p2p_device *dev,
37 const u8 *channel_list, size_t channel_list_len)
38 {
39 const u8 *pos, *end;
40 struct p2p_channels *ch;
41 u8 channels;
42 struct p2p_channels intersection;
43
44 ch = &dev->channels;
45 os_memset(ch, 0, sizeof(*ch));
46 pos = channel_list;
47 end = channel_list + channel_list_len;
48
49 if (end - pos < 3)
50 return -1;
51 os_memcpy(dev->country, pos, 3);
52 wpa_hexdump_ascii(MSG_DEBUG, "P2P: Peer country", pos, 3);
53 if (pos[2] != 0x04 && os_memcmp(pos, p2p->cfg->country, 2) != 0) {
54 p2p_info(p2p, "Mismatching country (ours=%c%c peer's=%c%c)",
55 p2p->cfg->country[0], p2p->cfg->country[1],
56 pos[0], pos[1]);
57 return -1;
58 }
59 pos += 3;
60
61 while (end - pos > 2) {
62 struct p2p_reg_class *cl = &ch->reg_class[ch->reg_classes];
63 cl->reg_class = *pos++;
64 channels = *pos++;
65 if (channels > end - pos) {
66 p2p_info(p2p, "Invalid peer Channel List");
67 return -1;
68 }
69 cl->channels = channels > P2P_MAX_REG_CLASS_CHANNELS ?
70 P2P_MAX_REG_CLASS_CHANNELS : channels;
71 os_memcpy(cl->channel, pos, cl->channels);
72 pos += channels;
73 ch->reg_classes++;
74 if (ch->reg_classes == P2P_MAX_REG_CLASSES)
75 break;
76 }
77
78 p2p_channels_intersect(own, &dev->channels, &intersection);
79 p2p_dbg(p2p, "Own reg_classes %d peer reg_classes %d intersection reg_classes %d",
80 (int) own->reg_classes,
81 (int) dev->channels.reg_classes,
82 (int) intersection.reg_classes);
83 if (intersection.reg_classes == 0) {
84 p2p_info(p2p, "No common channels found");
85 return -1;
86 }
87 return 0;
88 }
89
90
p2p_peer_channels(struct p2p_data * p2p,struct p2p_device * dev,const u8 * channel_list,size_t channel_list_len)91 static int p2p_peer_channels(struct p2p_data *p2p, struct p2p_device *dev,
92 const u8 *channel_list, size_t channel_list_len)
93 {
94 return p2p_peer_channels_check(p2p, &p2p->channels, dev,
95 channel_list, channel_list_len);
96 }
97
98
p2p_wps_method_pw_id(enum p2p_wps_method wps_method)99 u16 p2p_wps_method_pw_id(enum p2p_wps_method wps_method)
100 {
101 switch (wps_method) {
102 case WPS_PIN_DISPLAY:
103 return DEV_PW_REGISTRAR_SPECIFIED;
104 case WPS_PIN_KEYPAD:
105 return DEV_PW_USER_SPECIFIED;
106 case WPS_PBC:
107 return DEV_PW_PUSHBUTTON;
108 case WPS_NFC:
109 return DEV_PW_NFC_CONNECTION_HANDOVER;
110 case WPS_P2PS:
111 return DEV_PW_P2PS_DEFAULT;
112 default:
113 return DEV_PW_DEFAULT;
114 }
115 }
116
117
p2p_wps_method_str(enum p2p_wps_method wps_method)118 static const char * p2p_wps_method_str(enum p2p_wps_method wps_method)
119 {
120 switch (wps_method) {
121 case WPS_PIN_DISPLAY:
122 return "Display";
123 case WPS_PIN_KEYPAD:
124 return "Keypad";
125 case WPS_PBC:
126 return "PBC";
127 case WPS_NFC:
128 return "NFC";
129 case WPS_P2PS:
130 return "P2PS";
131 default:
132 return "??";
133 }
134 }
135
136
p2p_build_go_neg_req(struct p2p_data * p2p,struct p2p_device * peer)137 static struct wpabuf * p2p_build_go_neg_req(struct p2p_data *p2p,
138 struct p2p_device *peer)
139 {
140 struct wpabuf *buf;
141 u8 *len;
142 u8 group_capab;
143 size_t extra = 0;
144 u16 pw_id;
145
146 #ifdef CONFIG_WIFI_DISPLAY
147 if (p2p->wfd_ie_go_neg)
148 extra = wpabuf_len(p2p->wfd_ie_go_neg);
149 #endif /* CONFIG_WIFI_DISPLAY */
150
151 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ])
152 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ]);
153
154 buf = wpabuf_alloc(1000 + extra);
155 if (buf == NULL)
156 return NULL;
157
158 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_REQ, peer->dialog_token);
159
160 len = p2p_buf_add_ie_hdr(buf);
161 group_capab = 0;
162 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) {
163 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP;
164 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN)
165 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_RECONN;
166 }
167 if (p2p->cross_connect)
168 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN;
169 if (p2p->cfg->p2p_intra_bss)
170 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST;
171 p2p_buf_add_capability(buf, p2p->dev_capab &
172 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY,
173 group_capab);
174 p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | peer->tie_breaker);
175 p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout);
176 p2p_buf_add_listen_channel(buf, p2p->cfg->country, p2p->cfg->reg_class,
177 p2p->cfg->channel);
178 if (p2p->ext_listen_interval)
179 p2p_buf_add_ext_listen_timing(buf, p2p->ext_listen_period,
180 p2p->ext_listen_interval);
181 p2p_buf_add_intended_addr(buf, p2p->intended_addr);
182 p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels);
183 p2p_buf_add_device_info(buf, p2p, peer);
184 p2p_buf_add_operating_channel(buf, p2p->cfg->country,
185 p2p->op_reg_class, p2p->op_channel);
186 p2p_buf_update_ie_hdr(buf, len);
187
188 p2p_buf_add_pref_channel_list(buf, p2p->pref_freq_list,
189 p2p->num_pref_freq);
190
191 /* WPS IE with Device Password ID attribute */
192 pw_id = p2p_wps_method_pw_id(peer->wps_method);
193 if (peer->oob_pw_id)
194 pw_id = peer->oob_pw_id;
195 if (p2p_build_wps_ie(p2p, buf, pw_id, 0) < 0) {
196 p2p_dbg(p2p, "Failed to build WPS IE for GO Negotiation Request");
197 wpabuf_free(buf);
198 return NULL;
199 }
200
201 #ifdef CONFIG_WIFI_DISPLAY
202 if (p2p->wfd_ie_go_neg)
203 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg);
204 #endif /* CONFIG_WIFI_DISPLAY */
205
206 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ])
207 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ]);
208
209 return buf;
210 }
211
212
p2p_connect_send(struct p2p_data * p2p,struct p2p_device * dev)213 int p2p_connect_send(struct p2p_data *p2p, struct p2p_device *dev)
214 {
215 struct wpabuf *req;
216 int freq;
217
218 if (dev->flags & P2P_DEV_PD_BEFORE_GO_NEG) {
219 u16 config_method;
220 p2p_dbg(p2p, "Use PD-before-GO-Neg workaround for " MACSTR,
221 MAC2STR(dev->info.p2p_device_addr));
222 if (dev->wps_method == WPS_PIN_DISPLAY)
223 config_method = WPS_CONFIG_KEYPAD;
224 else if (dev->wps_method == WPS_PIN_KEYPAD)
225 config_method = WPS_CONFIG_DISPLAY;
226 else if (dev->wps_method == WPS_PBC)
227 config_method = WPS_CONFIG_PUSHBUTTON;
228 else if (dev->wps_method == WPS_P2PS)
229 config_method = WPS_CONFIG_P2PS;
230 else
231 return -1;
232 return p2p_prov_disc_req(p2p, dev->info.p2p_device_addr,
233 NULL, config_method, 0, 0, 1);
234 }
235
236 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq;
237 if (dev->oob_go_neg_freq > 0)
238 freq = dev->oob_go_neg_freq;
239 if (freq <= 0) {
240 p2p_dbg(p2p, "No Listen/Operating frequency known for the peer "
241 MACSTR " to send GO Negotiation Request",
242 MAC2STR(dev->info.p2p_device_addr));
243 return -1;
244 }
245
246 req = p2p_build_go_neg_req(p2p, dev);
247 if (req == NULL)
248 return -1;
249 p2p_dbg(p2p, "Sending GO Negotiation Request");
250 p2p_set_state(p2p, P2P_CONNECT);
251 p2p->pending_action_state = P2P_PENDING_GO_NEG_REQUEST;
252 p2p->go_neg_peer = dev;
253 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, NULL);
254 dev->flags |= P2P_DEV_WAIT_GO_NEG_RESPONSE;
255 dev->connect_reqs++;
256 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr,
257 p2p->cfg->dev_addr, dev->info.p2p_device_addr,
258 wpabuf_head(req), wpabuf_len(req), 500) < 0) {
259 p2p_dbg(p2p, "Failed to send Action frame");
260 /* Use P2P find to recover and retry */
261 p2p_set_timeout(p2p, 0, 0);
262 } else
263 dev->go_neg_req_sent++;
264
265 wpabuf_free(req);
266
267 return 0;
268 }
269
270
p2p_build_go_neg_resp(struct p2p_data * p2p,struct p2p_device * peer,u8 dialog_token,u8 status,u8 tie_breaker)271 static struct wpabuf * p2p_build_go_neg_resp(struct p2p_data *p2p,
272 struct p2p_device *peer,
273 u8 dialog_token, u8 status,
274 u8 tie_breaker)
275 {
276 struct wpabuf *buf;
277 u8 *len;
278 u8 group_capab;
279 size_t extra = 0;
280 u16 pw_id;
281
282 p2p_dbg(p2p, "Building GO Negotiation Response");
283
284 #ifdef CONFIG_WIFI_DISPLAY
285 if (p2p->wfd_ie_go_neg)
286 extra = wpabuf_len(p2p->wfd_ie_go_neg);
287 #endif /* CONFIG_WIFI_DISPLAY */
288
289 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP])
290 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]);
291
292 buf = wpabuf_alloc(1000 + extra);
293 if (buf == NULL)
294 return NULL;
295
296 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_RESP, dialog_token);
297
298 len = p2p_buf_add_ie_hdr(buf);
299 p2p_buf_add_status(buf, status);
300 group_capab = 0;
301 if (peer && peer->go_state == LOCAL_GO) {
302 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) {
303 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP;
304 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN)
305 group_capab |=
306 P2P_GROUP_CAPAB_PERSISTENT_RECONN;
307 }
308 if (p2p->cross_connect)
309 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN;
310 if (p2p->cfg->p2p_intra_bss)
311 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST;
312 }
313 p2p_buf_add_capability(buf, p2p->dev_capab &
314 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY,
315 group_capab);
316 p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | tie_breaker);
317 p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout);
318 if (p2p->override_pref_op_class) {
319 p2p_dbg(p2p, "Override operating channel preference");
320 p2p_buf_add_operating_channel(buf, p2p->cfg->country,
321 p2p->override_pref_op_class,
322 p2p->override_pref_channel);
323 } else if (peer && peer->go_state == REMOTE_GO && !p2p->num_pref_freq) {
324 p2p_dbg(p2p, "Omit Operating Channel attribute");
325 } else {
326 p2p_buf_add_operating_channel(buf, p2p->cfg->country,
327 p2p->op_reg_class,
328 p2p->op_channel);
329 }
330 p2p_buf_add_intended_addr(buf, p2p->intended_addr);
331 if (status || peer == NULL) {
332 p2p_buf_add_channel_list(buf, p2p->cfg->country,
333 &p2p->channels);
334 } else if (peer->go_state == REMOTE_GO) {
335 p2p_buf_add_channel_list(buf, p2p->cfg->country,
336 &p2p->channels);
337 } else {
338 struct p2p_channels res;
339 p2p_channels_intersect(&p2p->channels, &peer->channels,
340 &res);
341 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res);
342 }
343 p2p_buf_add_device_info(buf, p2p, peer);
344 if (peer && peer->go_state == LOCAL_GO) {
345 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid,
346 p2p->ssid_len);
347 }
348 p2p_buf_update_ie_hdr(buf, len);
349
350 /* WPS IE with Device Password ID attribute */
351 pw_id = p2p_wps_method_pw_id(peer ? peer->wps_method : WPS_NOT_READY);
352 if (peer && peer->oob_pw_id)
353 pw_id = peer->oob_pw_id;
354 if (p2p_build_wps_ie(p2p, buf, pw_id, 0) < 0) {
355 p2p_dbg(p2p, "Failed to build WPS IE for GO Negotiation Response");
356 wpabuf_free(buf);
357 return NULL;
358 }
359
360 #ifdef CONFIG_WIFI_DISPLAY
361 if (p2p->wfd_ie_go_neg)
362 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg);
363 #endif /* CONFIG_WIFI_DISPLAY */
364
365 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP])
366 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]);
367
368 return buf;
369 }
370
371
372 /**
373 * p2p_reselect_channel - Re-select operating channel based on peer information
374 * @p2p: P2P module context from p2p_init()
375 * @intersection: Support channel list intersection from local and peer
376 *
377 * This function is used to re-select the best channel after having received
378 * information from the peer to allow supported channel lists to be intersected.
379 * This can be used to improve initial channel selection done in
380 * p2p_prepare_channel() prior to the start of GO Negotiation. In addition, this
381 * can be used for Invitation case.
382 */
p2p_reselect_channel(struct p2p_data * p2p,struct p2p_channels * intersection)383 void p2p_reselect_channel(struct p2p_data *p2p,
384 struct p2p_channels *intersection)
385 {
386 struct p2p_reg_class *cl;
387 int freq;
388 u8 op_reg_class, op_channel;
389 unsigned int i;
390 const int op_classes_5ghz[] = { 124, 125, 115, 0 };
391 const int op_classes_ht40[] = { 126, 127, 116, 117, 0 };
392 const int op_classes_vht[] = { 128, 129, 130, 0 };
393 const int op_classes_edmg[] = { 181, 182, 183, 0 };
394
395 if (p2p->own_freq_preference > 0 &&
396 p2p_freq_to_channel(p2p->own_freq_preference,
397 &op_reg_class, &op_channel) == 0 &&
398 p2p_channels_includes(intersection, op_reg_class, op_channel)) {
399 p2p_dbg(p2p, "Pick own channel preference (reg_class %u channel %u) from intersection",
400 op_reg_class, op_channel);
401 p2p->op_reg_class = op_reg_class;
402 p2p->op_channel = op_channel;
403 return;
404 }
405
406 if (p2p->best_freq_overall > 0 &&
407 p2p_freq_to_channel(p2p->best_freq_overall,
408 &op_reg_class, &op_channel) == 0 &&
409 p2p_channels_includes(intersection, op_reg_class, op_channel)) {
410 p2p_dbg(p2p, "Pick best overall channel (reg_class %u channel %u) from intersection",
411 op_reg_class, op_channel);
412 p2p->op_reg_class = op_reg_class;
413 p2p->op_channel = op_channel;
414 return;
415 }
416
417 /* First, try to pick the best channel from another band */
418 freq = p2p_channel_to_freq(p2p->op_reg_class, p2p->op_channel);
419 if (freq >= 2400 && freq < 2500 && p2p->best_freq_5 > 0 &&
420 !p2p_channels_includes(intersection, p2p->op_reg_class,
421 p2p->op_channel) &&
422 p2p_freq_to_channel(p2p->best_freq_5,
423 &op_reg_class, &op_channel) == 0 &&
424 p2p_channels_includes(intersection, op_reg_class, op_channel)) {
425 p2p_dbg(p2p, "Pick best 5 GHz channel (reg_class %u channel %u) from intersection",
426 op_reg_class, op_channel);
427 p2p->op_reg_class = op_reg_class;
428 p2p->op_channel = op_channel;
429 return;
430 }
431
432 if (freq >= 4900 && freq < 6000 && p2p->best_freq_24 > 0 &&
433 !p2p_channels_includes(intersection, p2p->op_reg_class,
434 p2p->op_channel) &&
435 p2p_freq_to_channel(p2p->best_freq_24,
436 &op_reg_class, &op_channel) == 0 &&
437 p2p_channels_includes(intersection, op_reg_class, op_channel)) {
438 p2p_dbg(p2p, "Pick best 2.4 GHz channel (reg_class %u channel %u) from intersection",
439 op_reg_class, op_channel);
440 p2p->op_reg_class = op_reg_class;
441 p2p->op_channel = op_channel;
442 return;
443 }
444
445 /* Select channel with highest preference if the peer supports it */
446 for (i = 0; p2p->cfg->pref_chan && i < p2p->cfg->num_pref_chan; i++) {
447 if (p2p_channels_includes(intersection,
448 p2p->cfg->pref_chan[i].op_class,
449 p2p->cfg->pref_chan[i].chan)) {
450 p2p->op_reg_class = p2p->cfg->pref_chan[i].op_class;
451 p2p->op_channel = p2p->cfg->pref_chan[i].chan;
452 p2p_dbg(p2p, "Pick highest preferred channel (op_class %u channel %u) from intersection",
453 p2p->op_reg_class, p2p->op_channel);
454 return;
455 }
456 }
457
458 /* Try a channel where we might be able to use EDMG */
459 if (p2p_channel_select(intersection, op_classes_edmg,
460 &p2p->op_reg_class, &p2p->op_channel) == 0) {
461 p2p_dbg(p2p, "Pick possible EDMG channel (op_class %u channel %u) from intersection",
462 p2p->op_reg_class, p2p->op_channel);
463 return;
464 }
465
466 /* Try a channel where we might be able to use VHT */
467 if (p2p_channel_select(intersection, op_classes_vht,
468 &p2p->op_reg_class, &p2p->op_channel) == 0) {
469 p2p_dbg(p2p, "Pick possible VHT channel (op_class %u channel %u) from intersection",
470 p2p->op_reg_class, p2p->op_channel);
471 return;
472 }
473
474 /* Try a channel where we might be able to use HT40 */
475 if (p2p_channel_select(intersection, op_classes_ht40,
476 &p2p->op_reg_class, &p2p->op_channel) == 0) {
477 p2p_dbg(p2p, "Pick possible HT40 channel (op_class %u channel %u) from intersection",
478 p2p->op_reg_class, p2p->op_channel);
479 return;
480 }
481
482 /* Prefer a 5 GHz channel */
483 if (p2p_channel_select(intersection, op_classes_5ghz,
484 &p2p->op_reg_class, &p2p->op_channel) == 0) {
485 p2p_dbg(p2p, "Pick possible 5 GHz channel (op_class %u channel %u) from intersection",
486 p2p->op_reg_class, p2p->op_channel);
487 return;
488 }
489
490 /*
491 * Try to see if the original channel is in the intersection. If
492 * so, no need to change anything, as it already contains some
493 * randomness.
494 */
495 if (p2p_channels_includes(intersection, p2p->op_reg_class,
496 p2p->op_channel)) {
497 p2p_dbg(p2p, "Using original operating class and channel (op_class %u channel %u) from intersection",
498 p2p->op_reg_class, p2p->op_channel);
499 return;
500 }
501
502 /*
503 * Fall back to whatever is included in the channel intersection since
504 * no better options seems to be available.
505 */
506 cl = &intersection->reg_class[0];
507 p2p_dbg(p2p, "Pick another channel (reg_class %u channel %u) from intersection",
508 cl->reg_class, cl->channel[0]);
509 p2p->op_reg_class = cl->reg_class;
510 p2p->op_channel = cl->channel[0];
511 }
512
513
p2p_go_select_channel(struct p2p_data * p2p,struct p2p_device * dev,u8 * status)514 int p2p_go_select_channel(struct p2p_data *p2p, struct p2p_device *dev,
515 u8 *status)
516 {
517 struct p2p_channels tmp, intersection;
518
519 p2p_channels_dump(p2p, "own channels", &p2p->channels);
520 p2p_channels_dump(p2p, "peer channels", &dev->channels);
521 p2p_channels_intersect(&p2p->channels, &dev->channels, &tmp);
522 p2p_channels_dump(p2p, "intersection", &tmp);
523 p2p_channels_remove_freqs(&tmp, &p2p->no_go_freq);
524 p2p_channels_dump(p2p, "intersection after no-GO removal", &tmp);
525 p2p_channels_intersect(&tmp, &p2p->cfg->channels, &intersection);
526 p2p_channels_dump(p2p, "intersection with local channel list",
527 &intersection);
528 if (intersection.reg_classes == 0 ||
529 intersection.reg_class[0].channels == 0) {
530 *status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
531 p2p_dbg(p2p, "No common channels found");
532 return -1;
533 }
534
535 if (!p2p_channels_includes(&intersection, p2p->op_reg_class,
536 p2p->op_channel)) {
537 if (dev->flags & P2P_DEV_FORCE_FREQ) {
538 *status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
539 p2p_dbg(p2p, "Peer does not support the forced channel");
540 return -1;
541 }
542
543 p2p_dbg(p2p, "Selected operating channel (op_class %u channel %u) not acceptable to the peer",
544 p2p->op_reg_class, p2p->op_channel);
545 p2p_reselect_channel(p2p, &intersection);
546 } else if (!(dev->flags & P2P_DEV_FORCE_FREQ) &&
547 !p2p->cfg->cfg_op_channel) {
548 p2p_dbg(p2p, "Try to optimize channel selection with peer information received; previously selected op_class %u channel %u",
549 p2p->op_reg_class, p2p->op_channel);
550 p2p_reselect_channel(p2p, &intersection);
551 }
552
553 if (!p2p->ssid_set) {
554 p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len);
555 p2p->ssid_set = 1;
556 }
557
558 return 0;
559 }
560
561
p2p_check_pref_chan_no_recv(struct p2p_data * p2p,int go,struct p2p_device * dev,struct p2p_message * msg,unsigned freq_list[],unsigned int size)562 static void p2p_check_pref_chan_no_recv(struct p2p_data *p2p, int go,
563 struct p2p_device *dev,
564 struct p2p_message *msg,
565 unsigned freq_list[], unsigned int size)
566 {
567 u8 op_class, op_channel;
568 unsigned int oper_freq = 0, i, j;
569 int found = 0;
570
571 p2p_dbg(p2p,
572 "Peer didn't provide a preferred frequency list, see if any of our preferred channels are supported by peer device");
573
574 /*
575 * Search for a common channel in our preferred frequency list which is
576 * also supported by the peer device.
577 */
578 for (i = 0; i < size && !found; i++) {
579 /* Make sure that the common frequency is supported by peer. */
580 oper_freq = freq_list[i];
581 if (p2p_freq_to_channel(oper_freq, &op_class,
582 &op_channel) < 0)
583 continue; /* cannot happen due to earlier check */
584 for (j = 0; j < msg->channel_list_len; j++) {
585 if (!msg->channel_list ||
586 op_channel != msg->channel_list[j])
587 continue;
588
589 p2p->op_reg_class = op_class;
590 p2p->op_channel = op_channel;
591 os_memcpy(&p2p->channels, &p2p->cfg->channels,
592 sizeof(struct p2p_channels));
593 found = 1;
594 break;
595 }
596 }
597
598 if (found) {
599 p2p_dbg(p2p,
600 "Freq %d MHz is a preferred channel and is also supported by peer, use it as the operating channel",
601 oper_freq);
602 } else {
603 p2p_dbg(p2p,
604 "None of our preferred channels are supported by peer!");
605 }
606 }
607
608
p2p_check_pref_chan_recv(struct p2p_data * p2p,int go,struct p2p_device * dev,struct p2p_message * msg,unsigned freq_list[],unsigned int size)609 static void p2p_check_pref_chan_recv(struct p2p_data *p2p, int go,
610 struct p2p_device *dev,
611 struct p2p_message *msg,
612 unsigned freq_list[], unsigned int size)
613 {
614 u8 op_class, op_channel;
615 unsigned int oper_freq = 0, i, j;
616 int found = 0;
617
618 /*
619 * Peer device supports a Preferred Frequency List.
620 * Search for a common channel in the preferred frequency lists
621 * of both peer and local devices.
622 */
623 for (i = 0; i < size && !found; i++) {
624 for (j = 2; j < (msg->pref_freq_list_len / 2); j++) {
625 oper_freq = p2p_channel_to_freq(
626 msg->pref_freq_list[2 * j],
627 msg->pref_freq_list[2 * j + 1]);
628 if (freq_list[i] != oper_freq)
629 continue;
630 if (p2p_freq_to_channel(oper_freq, &op_class,
631 &op_channel) < 0)
632 continue; /* cannot happen */
633 p2p->op_reg_class = op_class;
634 p2p->op_channel = op_channel;
635 os_memcpy(&p2p->channels, &p2p->cfg->channels,
636 sizeof(struct p2p_channels));
637 found = 1;
638 break;
639 }
640 }
641
642 if (found) {
643 p2p_dbg(p2p,
644 "Freq %d MHz is a common preferred channel for both peer and local, use it as operating channel",
645 oper_freq);
646 } else {
647 p2p_dbg(p2p, "No common preferred channels found!");
648 }
649 }
650
651
p2p_check_pref_chan(struct p2p_data * p2p,int go,struct p2p_device * dev,struct p2p_message * msg)652 void p2p_check_pref_chan(struct p2p_data *p2p, int go,
653 struct p2p_device *dev, struct p2p_message *msg)
654 {
655 unsigned int freq_list[P2P_MAX_PREF_CHANNELS], size;
656 unsigned int i;
657 u8 op_class, op_channel;
658 char txt[100], *pos, *end;
659 int res;
660
661 /*
662 * Use the preferred channel list from the driver only if there is no
663 * forced_freq, e.g., P2P_CONNECT freq=..., and no preferred operating
664 * channel hardcoded in the configuration file.
665 */
666 if (!p2p->cfg->get_pref_freq_list || p2p->cfg->num_pref_chan ||
667 (dev->flags & P2P_DEV_FORCE_FREQ) || p2p->cfg->cfg_op_channel)
668 return;
669
670 /* Obtain our preferred frequency list from driver based on P2P role. */
671 size = P2P_MAX_PREF_CHANNELS;
672 if (p2p->cfg->get_pref_freq_list(p2p->cfg->cb_ctx, go, &size,
673 freq_list))
674 return;
675 /* Filter out frequencies that are not acceptable for P2P use */
676 i = 0;
677 while (i < size) {
678 if (p2p_freq_to_channel(freq_list[i], &op_class,
679 &op_channel) < 0 ||
680 (!p2p_channels_includes(&p2p->cfg->channels,
681 op_class, op_channel) &&
682 (go || !p2p_channels_includes(&p2p->cfg->cli_channels,
683 op_class, op_channel)))) {
684 p2p_dbg(p2p,
685 "Ignore local driver frequency preference %u MHz since it is not acceptable for P2P use (go=%d)",
686 freq_list[i], go);
687 if (size - i - 1 > 0)
688 os_memmove(&freq_list[i], &freq_list[i + 1],
689 (size - i - 1) *
690 sizeof(unsigned int));
691 size--;
692 continue;
693 }
694
695 /* Preferred frequency is acceptable for P2P use */
696 i++;
697 }
698
699 pos = txt;
700 end = pos + sizeof(txt);
701 for (i = 0; i < size; i++) {
702 res = os_snprintf(pos, end - pos, " %u", freq_list[i]);
703 if (os_snprintf_error(end - pos, res))
704 break;
705 pos += res;
706 }
707 *pos = '\0';
708 p2p_dbg(p2p, "Local driver frequency preference (size=%u):%s",
709 size, txt);
710
711 /*
712 * Check if peer's preference of operating channel is in
713 * our preferred channel list.
714 */
715 for (i = 0; i < size; i++) {
716 if (freq_list[i] == (unsigned int) dev->oper_freq)
717 break;
718 }
719 if (i != size &&
720 p2p_freq_to_channel(freq_list[i], &op_class, &op_channel) == 0) {
721 /* Peer operating channel preference matches our preference */
722 p2p->op_reg_class = op_class;
723 p2p->op_channel = op_channel;
724 os_memcpy(&p2p->channels, &p2p->cfg->channels,
725 sizeof(struct p2p_channels));
726 return;
727 }
728
729 p2p_dbg(p2p,
730 "Peer operating channel preference: %d MHz is not in our preferred channel list",
731 dev->oper_freq);
732
733 /*
734 Check if peer's preferred channel list is
735 * _not_ included in the GO Negotiation Request or Invitation Request.
736 */
737 if (msg->pref_freq_list_len == 0)
738 p2p_check_pref_chan_no_recv(p2p, go, dev, msg, freq_list, size);
739 else
740 p2p_check_pref_chan_recv(p2p, go, dev, msg, freq_list, size);
741 }
742
743
p2p_process_go_neg_req(struct p2p_data * p2p,const u8 * sa,const u8 * data,size_t len,int rx_freq)744 void p2p_process_go_neg_req(struct p2p_data *p2p, const u8 *sa,
745 const u8 *data, size_t len, int rx_freq)
746 {
747 struct p2p_device *dev = NULL;
748 struct wpabuf *resp;
749 struct p2p_message msg;
750 u8 status = P2P_SC_FAIL_INVALID_PARAMS;
751 int tie_breaker = 0;
752 int freq;
753
754 p2p_dbg(p2p, "Received GO Negotiation Request from " MACSTR "(freq=%d)",
755 MAC2STR(sa), rx_freq);
756
757 if (p2p_parse(data, len, &msg))
758 return;
759
760 if (!msg.capability) {
761 p2p_dbg(p2p, "Mandatory Capability attribute missing from GO Negotiation Request");
762 #ifdef CONFIG_P2P_STRICT
763 goto fail;
764 #endif /* CONFIG_P2P_STRICT */
765 }
766
767 if (msg.go_intent)
768 tie_breaker = *msg.go_intent & 0x01;
769 else {
770 p2p_dbg(p2p, "Mandatory GO Intent attribute missing from GO Negotiation Request");
771 #ifdef CONFIG_P2P_STRICT
772 goto fail;
773 #endif /* CONFIG_P2P_STRICT */
774 }
775
776 if (!msg.config_timeout) {
777 p2p_dbg(p2p, "Mandatory Configuration Timeout attribute missing from GO Negotiation Request");
778 #ifdef CONFIG_P2P_STRICT
779 goto fail;
780 #endif /* CONFIG_P2P_STRICT */
781 }
782
783 if (!msg.listen_channel) {
784 p2p_dbg(p2p, "No Listen Channel attribute received");
785 goto fail;
786 }
787 if (!msg.operating_channel) {
788 p2p_dbg(p2p, "No Operating Channel attribute received");
789 goto fail;
790 }
791 if (!msg.channel_list) {
792 p2p_dbg(p2p, "No Channel List attribute received");
793 goto fail;
794 }
795 if (!msg.intended_addr) {
796 p2p_dbg(p2p, "No Intended P2P Interface Address attribute received");
797 goto fail;
798 }
799 if (!msg.p2p_device_info) {
800 p2p_dbg(p2p, "No P2P Device Info attribute received");
801 goto fail;
802 }
803
804 if (os_memcmp(msg.p2p_device_addr, sa, ETH_ALEN) != 0) {
805 p2p_dbg(p2p, "Unexpected GO Negotiation Request SA=" MACSTR
806 " != dev_addr=" MACSTR,
807 MAC2STR(sa), MAC2STR(msg.p2p_device_addr));
808 goto fail;
809 }
810
811 dev = p2p_get_device(p2p, sa);
812
813 if (msg.status && *msg.status) {
814 p2p_dbg(p2p, "Unexpected Status attribute (%d) in GO Negotiation Request",
815 *msg.status);
816 if (dev && p2p->go_neg_peer == dev &&
817 *msg.status == P2P_SC_FAIL_REJECTED_BY_USER) {
818 /*
819 * This mechanism for using Status attribute in GO
820 * Negotiation Request is not compliant with the P2P
821 * specification, but some deployed devices use it to
822 * indicate rejection of GO Negotiation in a case where
823 * they have sent out GO Negotiation Response with
824 * status 1. The P2P specification explicitly disallows
825 * this. To avoid unnecessary interoperability issues
826 * and extra frames, mark the pending negotiation as
827 * failed and do not reply to this GO Negotiation
828 * Request frame.
829 */
830 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
831 p2p_go_neg_failed(p2p, *msg.status);
832 p2p_parse_free(&msg);
833 return;
834 }
835 goto fail;
836 }
837
838 if (dev == NULL)
839 dev = p2p_add_dev_from_go_neg_req(p2p, sa, &msg);
840 else if ((dev->flags & P2P_DEV_PROBE_REQ_ONLY) ||
841 !(dev->flags & P2P_DEV_REPORTED))
842 p2p_add_dev_info(p2p, sa, dev, &msg);
843 else if (!dev->listen_freq && !dev->oper_freq) {
844 /*
845 * This may happen if the peer entry was added based on PD
846 * Request and no Probe Request/Response frame has been received
847 * from this peer (or that information has timed out).
848 */
849 p2p_dbg(p2p, "Update peer " MACSTR
850 " based on GO Neg Req since listen/oper freq not known",
851 MAC2STR(dev->info.p2p_device_addr));
852 p2p_add_dev_info(p2p, sa, dev, &msg);
853 }
854
855 if (p2p->go_neg_peer && p2p->go_neg_peer == dev)
856 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, NULL);
857
858 if (dev && dev->flags & P2P_DEV_USER_REJECTED) {
859 p2p_dbg(p2p, "User has rejected this peer");
860 status = P2P_SC_FAIL_REJECTED_BY_USER;
861 } else if (dev == NULL ||
862 (dev->wps_method == WPS_NOT_READY &&
863 (p2p->authorized_oob_dev_pw_id == 0 ||
864 p2p->authorized_oob_dev_pw_id !=
865 msg.dev_password_id))) {
866 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR,
867 MAC2STR(sa));
868 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
869 p2p->cfg->go_neg_req_rx(p2p->cfg->cb_ctx, sa,
870 msg.dev_password_id,
871 msg.go_intent ? (*msg.go_intent >> 1) :
872 0);
873 } else if (p2p->go_neg_peer && p2p->go_neg_peer != dev) {
874 p2p_dbg(p2p, "Already in Group Formation with another peer");
875 status = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
876 } else {
877 int go;
878
879 if (!p2p->go_neg_peer) {
880 p2p_dbg(p2p, "Starting GO Negotiation with previously authorized peer");
881 if (!(dev->flags & P2P_DEV_FORCE_FREQ)) {
882 p2p_dbg(p2p, "Use default channel settings");
883 p2p->op_reg_class = p2p->cfg->op_reg_class;
884 p2p->op_channel = p2p->cfg->op_channel;
885 os_memcpy(&p2p->channels, &p2p->cfg->channels,
886 sizeof(struct p2p_channels));
887 } else {
888 p2p_dbg(p2p, "Use previously configured forced channel settings");
889 }
890 }
891
892 dev->flags &= ~P2P_DEV_NOT_YET_READY;
893
894 if (!msg.go_intent) {
895 p2p_dbg(p2p, "No GO Intent attribute received");
896 goto fail;
897 }
898 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) {
899 p2p_dbg(p2p, "Invalid GO Intent value (%u) received",
900 *msg.go_intent >> 1);
901 goto fail;
902 }
903
904 if (dev->go_neg_req_sent &&
905 os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) > 0) {
906 p2p_dbg(p2p, "Do not reply since peer has higher address and GO Neg Request already sent");
907 p2p_parse_free(&msg);
908 return;
909 }
910
911 if (dev->go_neg_req_sent &&
912 (dev->flags & P2P_DEV_PEER_WAITING_RESPONSE)) {
913 p2p_dbg(p2p,
914 "Do not reply since peer is waiting for us to start a new GO Negotiation and GO Neg Request already sent");
915 p2p_parse_free(&msg);
916 return;
917 }
918
919 go = p2p_go_det(p2p->go_intent, *msg.go_intent);
920 if (go < 0) {
921 p2p_dbg(p2p, "Incompatible GO Intent");
922 status = P2P_SC_FAIL_BOTH_GO_INTENT_15;
923 goto fail;
924 }
925
926 if (p2p_peer_channels(p2p, dev, msg.channel_list,
927 msg.channel_list_len) < 0) {
928 p2p_dbg(p2p, "No common channels found");
929 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
930 goto fail;
931 }
932
933 switch (msg.dev_password_id) {
934 case DEV_PW_REGISTRAR_SPECIFIED:
935 p2p_dbg(p2p, "PIN from peer Display");
936 if (dev->wps_method != WPS_PIN_KEYPAD) {
937 p2p_dbg(p2p, "We have wps_method=%s -> incompatible",
938 p2p_wps_method_str(dev->wps_method));
939 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
940 goto fail;
941 }
942 break;
943 case DEV_PW_USER_SPECIFIED:
944 p2p_dbg(p2p, "Peer entered PIN on Keypad");
945 if (dev->wps_method != WPS_PIN_DISPLAY) {
946 p2p_dbg(p2p, "We have wps_method=%s -> incompatible",
947 p2p_wps_method_str(dev->wps_method));
948 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
949 goto fail;
950 }
951 break;
952 case DEV_PW_PUSHBUTTON:
953 p2p_dbg(p2p, "Peer using pushbutton");
954 if (dev->wps_method != WPS_PBC) {
955 p2p_dbg(p2p, "We have wps_method=%s -> incompatible",
956 p2p_wps_method_str(dev->wps_method));
957 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
958 goto fail;
959 }
960 break;
961 case DEV_PW_P2PS_DEFAULT:
962 p2p_dbg(p2p, "Peer using P2PS pin");
963 if (dev->wps_method != WPS_P2PS) {
964 p2p_dbg(p2p,
965 "We have wps_method=%s -> incompatible",
966 p2p_wps_method_str(dev->wps_method));
967 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
968 goto fail;
969 }
970 break;
971 default:
972 if (msg.dev_password_id &&
973 msg.dev_password_id == dev->oob_pw_id) {
974 p2p_dbg(p2p, "Peer using NFC");
975 if (dev->wps_method != WPS_NFC) {
976 p2p_dbg(p2p, "We have wps_method=%s -> incompatible",
977 p2p_wps_method_str(
978 dev->wps_method));
979 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
980 goto fail;
981 }
982 break;
983 }
984 #ifdef CONFIG_WPS_NFC
985 if (p2p->authorized_oob_dev_pw_id &&
986 msg.dev_password_id ==
987 p2p->authorized_oob_dev_pw_id) {
988 p2p_dbg(p2p, "Using static handover with our device password from NFC Tag");
989 dev->wps_method = WPS_NFC;
990 dev->oob_pw_id = p2p->authorized_oob_dev_pw_id;
991 break;
992 }
993 #endif /* CONFIG_WPS_NFC */
994 p2p_dbg(p2p, "Unsupported Device Password ID %d",
995 msg.dev_password_id);
996 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
997 goto fail;
998 }
999
1000 if (go && p2p_go_select_channel(p2p, dev, &status) < 0)
1001 goto fail;
1002
1003 dev->go_state = go ? LOCAL_GO : REMOTE_GO;
1004 dev->oper_freq = p2p_channel_to_freq(msg.operating_channel[3],
1005 msg.operating_channel[4]);
1006 p2p_dbg(p2p, "Peer operating channel preference: %d MHz",
1007 dev->oper_freq);
1008
1009 /*
1010 * Use the driver preferred frequency list extension if
1011 * supported.
1012 */
1013 p2p_check_pref_chan(p2p, go, dev, &msg);
1014
1015 if (msg.config_timeout) {
1016 dev->go_timeout = msg.config_timeout[0];
1017 dev->client_timeout = msg.config_timeout[1];
1018 }
1019
1020 p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa));
1021 if (p2p->state != P2P_IDLE)
1022 p2p_stop_find_for_freq(p2p, rx_freq);
1023 p2p_set_state(p2p, P2P_GO_NEG);
1024 p2p_clear_timeout(p2p);
1025 dev->dialog_token = msg.dialog_token;
1026 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN);
1027 p2p->go_neg_peer = dev;
1028 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, NULL);
1029 status = P2P_SC_SUCCESS;
1030 }
1031
1032 fail:
1033 if (dev)
1034 dev->status = status;
1035 resp = p2p_build_go_neg_resp(p2p, dev, msg.dialog_token, status,
1036 !tie_breaker);
1037 p2p_parse_free(&msg);
1038 if (resp == NULL)
1039 return;
1040 p2p_dbg(p2p, "Sending GO Negotiation Response");
1041 if (rx_freq > 0)
1042 freq = rx_freq;
1043 else
1044 freq = p2p_channel_to_freq(p2p->cfg->reg_class,
1045 p2p->cfg->channel);
1046 if (freq < 0) {
1047 p2p_dbg(p2p, "Unknown regulatory class/channel");
1048 wpabuf_free(resp);
1049 return;
1050 }
1051 if (status == P2P_SC_SUCCESS) {
1052 p2p->pending_action_state = P2P_PENDING_GO_NEG_RESPONSE;
1053 dev->flags |= P2P_DEV_WAIT_GO_NEG_CONFIRM;
1054 if (os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) < 0) {
1055 /*
1056 * Peer has smaller address, so the GO Negotiation
1057 * Response from us is expected to complete
1058 * negotiation. Ignore a GO Negotiation Response from
1059 * the peer if it happens to be received after this
1060 * point due to a race condition in GO Negotiation
1061 * Request transmission and processing.
1062 */
1063 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE;
1064 }
1065 } else
1066 p2p->pending_action_state =
1067 P2P_PENDING_GO_NEG_RESPONSE_FAILURE;
1068 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr,
1069 p2p->cfg->dev_addr,
1070 wpabuf_head(resp), wpabuf_len(resp), 100) < 0) {
1071 p2p_dbg(p2p, "Failed to send Action frame");
1072 }
1073
1074 wpabuf_free(resp);
1075 }
1076
1077
p2p_build_go_neg_conf(struct p2p_data * p2p,struct p2p_device * peer,u8 dialog_token,u8 status,const u8 * resp_chan,int go)1078 static struct wpabuf * p2p_build_go_neg_conf(struct p2p_data *p2p,
1079 struct p2p_device *peer,
1080 u8 dialog_token, u8 status,
1081 const u8 *resp_chan, int go)
1082 {
1083 struct wpabuf *buf;
1084 u8 *len;
1085 struct p2p_channels res;
1086 u8 group_capab;
1087 size_t extra = 0;
1088
1089 p2p_dbg(p2p, "Building GO Negotiation Confirm");
1090
1091 #ifdef CONFIG_WIFI_DISPLAY
1092 if (p2p->wfd_ie_go_neg)
1093 extra = wpabuf_len(p2p->wfd_ie_go_neg);
1094 #endif /* CONFIG_WIFI_DISPLAY */
1095
1096 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF])
1097 extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]);
1098
1099 buf = wpabuf_alloc(1000 + extra);
1100 if (buf == NULL)
1101 return NULL;
1102
1103 p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_CONF, dialog_token);
1104
1105 len = p2p_buf_add_ie_hdr(buf);
1106 p2p_buf_add_status(buf, status);
1107 group_capab = 0;
1108 if (peer->go_state == LOCAL_GO) {
1109 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) {
1110 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP;
1111 if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN)
1112 group_capab |=
1113 P2P_GROUP_CAPAB_PERSISTENT_RECONN;
1114 }
1115 if (p2p->cross_connect)
1116 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN;
1117 if (p2p->cfg->p2p_intra_bss)
1118 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST;
1119 }
1120 p2p_buf_add_capability(buf, p2p->dev_capab &
1121 ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY,
1122 group_capab);
1123 if (go || resp_chan == NULL)
1124 p2p_buf_add_operating_channel(buf, p2p->cfg->country,
1125 p2p->op_reg_class,
1126 p2p->op_channel);
1127 else
1128 p2p_buf_add_operating_channel(buf, (const char *) resp_chan,
1129 resp_chan[3], resp_chan[4]);
1130 p2p_channels_intersect(&p2p->channels, &peer->channels, &res);
1131 p2p_buf_add_channel_list(buf, p2p->cfg->country, &res);
1132 if (go) {
1133 p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid,
1134 p2p->ssid_len);
1135 }
1136 p2p_buf_update_ie_hdr(buf, len);
1137
1138 #ifdef CONFIG_WIFI_DISPLAY
1139 if (p2p->wfd_ie_go_neg)
1140 wpabuf_put_buf(buf, p2p->wfd_ie_go_neg);
1141 #endif /* CONFIG_WIFI_DISPLAY */
1142
1143 if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF])
1144 wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]);
1145
1146 return buf;
1147 }
1148
1149
p2p_process_go_neg_resp(struct p2p_data * p2p,const u8 * sa,const u8 * data,size_t len,int rx_freq)1150 void p2p_process_go_neg_resp(struct p2p_data *p2p, const u8 *sa,
1151 const u8 *data, size_t len, int rx_freq)
1152 {
1153 struct p2p_device *dev;
1154 int go = -1;
1155 struct p2p_message msg;
1156 u8 status = P2P_SC_SUCCESS;
1157 int freq;
1158
1159 p2p_dbg(p2p, "Received GO Negotiation Response from " MACSTR
1160 " (freq=%d)", MAC2STR(sa), rx_freq);
1161 dev = p2p_get_device(p2p, sa);
1162 if (dev == NULL || dev->wps_method == WPS_NOT_READY ||
1163 dev != p2p->go_neg_peer) {
1164 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR,
1165 MAC2STR(sa));
1166 return;
1167 }
1168
1169 if (p2p_parse(data, len, &msg))
1170 return;
1171
1172 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_RESPONSE)) {
1173 p2p_dbg(p2p, "Was not expecting GO Negotiation Response - ignore");
1174 p2p_parse_free(&msg);
1175 return;
1176 }
1177 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE;
1178
1179 if (msg.dialog_token != dev->dialog_token) {
1180 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)",
1181 msg.dialog_token, dev->dialog_token);
1182 p2p_parse_free(&msg);
1183 return;
1184 }
1185
1186 if (!msg.status) {
1187 p2p_dbg(p2p, "No Status attribute received");
1188 status = P2P_SC_FAIL_INVALID_PARAMS;
1189 goto fail;
1190 }
1191 if (*msg.status) {
1192 p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status);
1193 dev->go_neg_req_sent = 0;
1194 if (*msg.status == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) {
1195 p2p_dbg(p2p, "Wait for the peer to become ready for GO Negotiation");
1196 dev->flags |= P2P_DEV_NOT_YET_READY;
1197 eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p,
1198 NULL);
1199 eloop_register_timeout(120, 0, p2p_go_neg_wait_timeout,
1200 p2p, NULL);
1201 if (p2p->state == P2P_CONNECT_LISTEN)
1202 p2p_set_state(p2p, P2P_WAIT_PEER_CONNECT);
1203 else
1204 p2p_set_state(p2p, P2P_WAIT_PEER_IDLE);
1205 p2p_set_timeout(p2p, 0, 0);
1206 } else {
1207 p2p_dbg(p2p, "Stop GO Negotiation attempt");
1208 p2p_go_neg_failed(p2p, *msg.status);
1209 }
1210 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
1211 p2p_parse_free(&msg);
1212 return;
1213 }
1214
1215 if (!msg.capability) {
1216 p2p_dbg(p2p, "Mandatory Capability attribute missing from GO Negotiation Response");
1217 #ifdef CONFIG_P2P_STRICT
1218 status = P2P_SC_FAIL_INVALID_PARAMS;
1219 goto fail;
1220 #endif /* CONFIG_P2P_STRICT */
1221 }
1222
1223 if (!msg.p2p_device_info) {
1224 p2p_dbg(p2p, "Mandatory P2P Device Info attribute missing from GO Negotiation Response");
1225 #ifdef CONFIG_P2P_STRICT
1226 status = P2P_SC_FAIL_INVALID_PARAMS;
1227 goto fail;
1228 #endif /* CONFIG_P2P_STRICT */
1229 }
1230
1231 if (!msg.intended_addr) {
1232 p2p_dbg(p2p, "No Intended P2P Interface Address attribute received");
1233 status = P2P_SC_FAIL_INVALID_PARAMS;
1234 goto fail;
1235 }
1236
1237 if (!msg.go_intent) {
1238 p2p_dbg(p2p, "No GO Intent attribute received");
1239 status = P2P_SC_FAIL_INVALID_PARAMS;
1240 goto fail;
1241 }
1242 if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) {
1243 p2p_dbg(p2p, "Invalid GO Intent value (%u) received",
1244 *msg.go_intent >> 1);
1245 status = P2P_SC_FAIL_INVALID_PARAMS;
1246 goto fail;
1247 }
1248
1249 go = p2p_go_det(p2p->go_intent, *msg.go_intent);
1250 if (go < 0) {
1251 p2p_dbg(p2p, "Incompatible GO Intent");
1252 status = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
1253 goto fail;
1254 }
1255
1256 if (!go && msg.group_id) {
1257 /* Store SSID for Provisioning step */
1258 p2p->ssid_len = msg.group_id_len - ETH_ALEN;
1259 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len);
1260 } else if (!go) {
1261 p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Response");
1262 p2p->ssid_len = 0;
1263 status = P2P_SC_FAIL_INVALID_PARAMS;
1264 goto fail;
1265 }
1266
1267 if (!msg.config_timeout) {
1268 p2p_dbg(p2p, "Mandatory Configuration Timeout attribute missing from GO Negotiation Response");
1269 #ifdef CONFIG_P2P_STRICT
1270 status = P2P_SC_FAIL_INVALID_PARAMS;
1271 goto fail;
1272 #endif /* CONFIG_P2P_STRICT */
1273 } else {
1274 dev->go_timeout = msg.config_timeout[0];
1275 dev->client_timeout = msg.config_timeout[1];
1276 }
1277
1278 if (msg.wfd_subelems) {
1279 wpabuf_free(dev->info.wfd_subelems);
1280 dev->info.wfd_subelems = wpabuf_dup(msg.wfd_subelems);
1281 }
1282
1283 if (!msg.operating_channel && !go) {
1284 /*
1285 * Note: P2P Client may omit Operating Channel attribute to
1286 * indicate it does not have a preference.
1287 */
1288 p2p_dbg(p2p, "No Operating Channel attribute received");
1289 status = P2P_SC_FAIL_INVALID_PARAMS;
1290 goto fail;
1291 }
1292 if (!msg.channel_list) {
1293 p2p_dbg(p2p, "No Channel List attribute received");
1294 status = P2P_SC_FAIL_INVALID_PARAMS;
1295 goto fail;
1296 }
1297
1298 if (p2p_peer_channels(p2p, dev, msg.channel_list,
1299 msg.channel_list_len) < 0) {
1300 p2p_dbg(p2p, "No common channels found");
1301 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
1302 goto fail;
1303 }
1304
1305 if (msg.operating_channel) {
1306 dev->oper_freq = p2p_channel_to_freq(msg.operating_channel[3],
1307 msg.operating_channel[4]);
1308 p2p_dbg(p2p, "Peer operating channel preference: %d MHz",
1309 dev->oper_freq);
1310 } else
1311 dev->oper_freq = 0;
1312
1313 switch (msg.dev_password_id) {
1314 case DEV_PW_REGISTRAR_SPECIFIED:
1315 p2p_dbg(p2p, "PIN from peer Display");
1316 if (dev->wps_method != WPS_PIN_KEYPAD) {
1317 p2p_dbg(p2p, "We have wps_method=%s -> incompatible",
1318 p2p_wps_method_str(dev->wps_method));
1319 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
1320 goto fail;
1321 }
1322 break;
1323 case DEV_PW_USER_SPECIFIED:
1324 p2p_dbg(p2p, "Peer entered PIN on Keypad");
1325 if (dev->wps_method != WPS_PIN_DISPLAY) {
1326 p2p_dbg(p2p, "We have wps_method=%s -> incompatible",
1327 p2p_wps_method_str(dev->wps_method));
1328 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
1329 goto fail;
1330 }
1331 break;
1332 case DEV_PW_PUSHBUTTON:
1333 p2p_dbg(p2p, "Peer using pushbutton");
1334 if (dev->wps_method != WPS_PBC) {
1335 p2p_dbg(p2p, "We have wps_method=%s -> incompatible",
1336 p2p_wps_method_str(dev->wps_method));
1337 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
1338 goto fail;
1339 }
1340 break;
1341 case DEV_PW_P2PS_DEFAULT:
1342 p2p_dbg(p2p, "P2P: Peer using P2PS default pin");
1343 if (dev->wps_method != WPS_P2PS) {
1344 p2p_dbg(p2p, "We have wps_method=%s -> incompatible",
1345 p2p_wps_method_str(dev->wps_method));
1346 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
1347 goto fail;
1348 }
1349 break;
1350 default:
1351 if (msg.dev_password_id &&
1352 msg.dev_password_id == dev->oob_pw_id) {
1353 p2p_dbg(p2p, "Peer using NFC");
1354 if (dev->wps_method != WPS_NFC) {
1355 p2p_dbg(p2p, "We have wps_method=%s -> incompatible",
1356 p2p_wps_method_str(dev->wps_method));
1357 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
1358 goto fail;
1359 }
1360 break;
1361 }
1362 p2p_dbg(p2p, "Unsupported Device Password ID %d",
1363 msg.dev_password_id);
1364 status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
1365 goto fail;
1366 }
1367
1368 if (go && p2p_go_select_channel(p2p, dev, &status) < 0)
1369 goto fail;
1370
1371 /*
1372 * Use the driver preferred frequency list extension if local device is
1373 * GO.
1374 */
1375 if (go)
1376 p2p_check_pref_chan(p2p, go, dev, &msg);
1377
1378 p2p_set_state(p2p, P2P_GO_NEG);
1379 p2p_clear_timeout(p2p);
1380
1381 p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa));
1382 os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN);
1383
1384 fail:
1385 /* Store GO Negotiation Confirmation to allow retransmission */
1386 wpabuf_free(dev->go_neg_conf);
1387 dev->go_neg_conf = p2p_build_go_neg_conf(p2p, dev, msg.dialog_token,
1388 status, msg.operating_channel,
1389 go);
1390 p2p_parse_free(&msg);
1391 if (dev->go_neg_conf == NULL)
1392 return;
1393 p2p_dbg(p2p, "Sending GO Negotiation Confirm");
1394 if (status == P2P_SC_SUCCESS) {
1395 p2p->pending_action_state = P2P_PENDING_GO_NEG_CONFIRM;
1396 dev->go_state = go ? LOCAL_GO : REMOTE_GO;
1397 } else
1398 p2p->pending_action_state = P2P_NO_PENDING_ACTION;
1399 if (rx_freq > 0)
1400 freq = rx_freq;
1401 else
1402 freq = dev->listen_freq;
1403
1404 dev->go_neg_conf_freq = freq;
1405 dev->go_neg_conf_sent = 0;
1406
1407 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, sa,
1408 wpabuf_head(dev->go_neg_conf),
1409 wpabuf_len(dev->go_neg_conf), 50) < 0) {
1410 p2p_dbg(p2p, "Failed to send Action frame");
1411 p2p_go_neg_failed(p2p, -1);
1412 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
1413 } else
1414 dev->go_neg_conf_sent++;
1415 if (status != P2P_SC_SUCCESS) {
1416 p2p_dbg(p2p, "GO Negotiation failed");
1417 p2p_go_neg_failed(p2p, status);
1418 }
1419 }
1420
1421
p2p_process_go_neg_conf(struct p2p_data * p2p,const u8 * sa,const u8 * data,size_t len)1422 void p2p_process_go_neg_conf(struct p2p_data *p2p, const u8 *sa,
1423 const u8 *data, size_t len)
1424 {
1425 struct p2p_device *dev;
1426 struct p2p_message msg;
1427
1428 p2p_dbg(p2p, "Received GO Negotiation Confirm from " MACSTR,
1429 MAC2STR(sa));
1430 dev = p2p_get_device(p2p, sa);
1431 if (dev == NULL || dev->wps_method == WPS_NOT_READY ||
1432 dev != p2p->go_neg_peer) {
1433 p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR,
1434 MAC2STR(sa));
1435 return;
1436 }
1437
1438 if (p2p->pending_action_state == P2P_PENDING_GO_NEG_RESPONSE) {
1439 p2p_dbg(p2p, "Stopped waiting for TX status on GO Negotiation Response since we already received Confirmation");
1440 p2p->pending_action_state = P2P_NO_PENDING_ACTION;
1441 }
1442
1443 if (p2p_parse(data, len, &msg))
1444 return;
1445
1446 if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_CONFIRM)) {
1447 p2p_dbg(p2p, "Was not expecting GO Negotiation Confirm - ignore");
1448 p2p_parse_free(&msg);
1449 return;
1450 }
1451 dev->flags &= ~P2P_DEV_WAIT_GO_NEG_CONFIRM;
1452 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
1453
1454 if (msg.dialog_token != dev->dialog_token) {
1455 p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)",
1456 msg.dialog_token, dev->dialog_token);
1457 p2p_parse_free(&msg);
1458 return;
1459 }
1460
1461 if (!msg.status) {
1462 p2p_dbg(p2p, "No Status attribute received");
1463 p2p_parse_free(&msg);
1464 return;
1465 }
1466 if (*msg.status) {
1467 p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status);
1468 p2p_go_neg_failed(p2p, *msg.status);
1469 p2p_parse_free(&msg);
1470 return;
1471 }
1472
1473 if (dev->go_state == REMOTE_GO && msg.group_id) {
1474 /* Store SSID for Provisioning step */
1475 p2p->ssid_len = msg.group_id_len - ETH_ALEN;
1476 os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len);
1477 } else if (dev->go_state == REMOTE_GO) {
1478 p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Confirmation");
1479 p2p->ssid_len = 0;
1480 p2p_go_neg_failed(p2p, P2P_SC_FAIL_INVALID_PARAMS);
1481 p2p_parse_free(&msg);
1482 return;
1483 }
1484
1485 if (!msg.operating_channel) {
1486 p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation");
1487 #ifdef CONFIG_P2P_STRICT
1488 p2p_parse_free(&msg);
1489 return;
1490 #endif /* CONFIG_P2P_STRICT */
1491 } else if (dev->go_state == REMOTE_GO) {
1492 int oper_freq = p2p_channel_to_freq(msg.operating_channel[3],
1493 msg.operating_channel[4]);
1494 if (oper_freq != dev->oper_freq) {
1495 p2p_dbg(p2p, "Updated peer (GO) operating channel preference from %d MHz to %d MHz",
1496 dev->oper_freq, oper_freq);
1497 dev->oper_freq = oper_freq;
1498 }
1499 }
1500
1501 if (!msg.channel_list) {
1502 p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation");
1503 #ifdef CONFIG_P2P_STRICT
1504 p2p_parse_free(&msg);
1505 return;
1506 #endif /* CONFIG_P2P_STRICT */
1507 }
1508
1509 p2p_parse_free(&msg);
1510
1511 if (dev->go_state == UNKNOWN_GO) {
1512 /*
1513 * This should not happen since GO negotiation has already
1514 * been completed.
1515 */
1516 p2p_dbg(p2p, "Unexpected GO Neg state - do not know which end becomes GO");
1517 return;
1518 }
1519
1520 /*
1521 * The peer could have missed our ctrl::ack frame for GO Negotiation
1522 * Confirm and continue retransmitting the frame. To reduce the
1523 * likelihood of the peer not getting successful TX status for the
1524 * GO Negotiation Confirm frame, wait a short time here before starting
1525 * the group so that we will remain on the current channel to
1526 * acknowledge any possible retransmission from the peer.
1527 */
1528 p2p_dbg(p2p, "20 ms wait on current channel before starting group");
1529 os_sleep(0, 20000);
1530
1531 p2p_go_complete(p2p, dev);
1532 }
1533
