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