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