1 /*
2 * Wi-Fi Direct - P2P group operations
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 "common/ieee802_11_defs.h"
13 #include "common/ieee802_11_common.h"
14 #include "common/wpa_ctrl.h"
15 #include "wps/wps_defs.h"
16 #include "wps/wps_i.h"
17 #include "p2p_i.h"
18 #include "p2p.h"
19
20
21 struct p2p_group_member {
22 struct p2p_group_member *next;
23 u8 addr[ETH_ALEN]; /* P2P Interface Address */
24 u8 dev_addr[ETH_ALEN]; /* P2P Device Address */
25 struct wpabuf *p2p_ie;
26 struct wpabuf *wfd_ie;
27 struct wpabuf *client_info;
28 u8 dev_capab;
29 };
30
31 /**
32 * struct p2p_group - Internal P2P module per-group data
33 */
34 struct p2p_group {
35 struct p2p_data *p2p;
36 struct p2p_group_config *cfg;
37 struct p2p_group_member *members;
38 unsigned int num_members;
39 int group_formation;
40 int beacon_update;
41 struct wpabuf *noa;
42 struct wpabuf *wfd_ie;
43 };
44
45
p2p_group_init(struct p2p_data * p2p,struct p2p_group_config * config)46 struct p2p_group * p2p_group_init(struct p2p_data *p2p,
47 struct p2p_group_config *config)
48 {
49 struct p2p_group *group, **groups;
50
51 group = os_zalloc(sizeof(*group));
52 if (group == NULL)
53 return NULL;
54
55 groups = os_realloc_array(p2p->groups, p2p->num_groups + 1,
56 sizeof(struct p2p_group *));
57 if (groups == NULL) {
58 os_free(group);
59 return NULL;
60 }
61 groups[p2p->num_groups++] = group;
62 p2p->groups = groups;
63
64 group->p2p = p2p;
65 group->cfg = config;
66 group->group_formation = 1;
67 group->beacon_update = 1;
68 p2p_group_update_ies(group);
69 group->cfg->idle_update(group->cfg->cb_ctx, 1);
70
71 return group;
72 }
73
74
p2p_group_free_member(struct p2p_group_member * m)75 static void p2p_group_free_member(struct p2p_group_member *m)
76 {
77 wpabuf_free(m->wfd_ie);
78 wpabuf_free(m->p2p_ie);
79 wpabuf_free(m->client_info);
80 os_free(m);
81 }
82
83
p2p_group_free_members(struct p2p_group * group)84 static void p2p_group_free_members(struct p2p_group *group)
85 {
86 struct p2p_group_member *m, *prev;
87 m = group->members;
88 group->members = NULL;
89 group->num_members = 0;
90 while (m) {
91 prev = m;
92 m = m->next;
93 p2p_group_free_member(prev);
94 }
95 }
96
97
p2p_group_deinit(struct p2p_group * group)98 void p2p_group_deinit(struct p2p_group *group)
99 {
100 size_t g;
101 struct p2p_data *p2p;
102
103 if (group == NULL)
104 return;
105
106 p2p = group->p2p;
107
108 for (g = 0; g < p2p->num_groups; g++) {
109 if (p2p->groups[g] == group) {
110 while (g + 1 < p2p->num_groups) {
111 p2p->groups[g] = p2p->groups[g + 1];
112 g++;
113 }
114 p2p->num_groups--;
115 break;
116 }
117 }
118
119 p2p_group_free_members(group);
120 os_free(group->cfg);
121 wpabuf_free(group->noa);
122 wpabuf_free(group->wfd_ie);
123 os_free(group);
124 }
125
126
p2p_client_info(struct wpabuf * ie,struct p2p_group_member * m)127 static void p2p_client_info(struct wpabuf *ie, struct p2p_group_member *m)
128 {
129 if (m->client_info == NULL)
130 return;
131 if (wpabuf_tailroom(ie) < wpabuf_len(m->client_info) + 1)
132 return;
133 wpabuf_put_buf(ie, m->client_info);
134 }
135
136
p2p_group_add_common_ies(struct p2p_group * group,struct wpabuf * ie)137 static void p2p_group_add_common_ies(struct p2p_group *group,
138 struct wpabuf *ie)
139 {
140 u8 dev_capab = group->p2p->dev_capab, group_capab = 0;
141
142 /* P2P Capability */
143 dev_capab &= ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY;
144 group_capab |= P2P_GROUP_CAPAB_GROUP_OWNER;
145 if (group->cfg->persistent_group) {
146 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP;
147 if (group->cfg->persistent_group == 2)
148 group_capab |= P2P_GROUP_CAPAB_PERSISTENT_RECONN;
149 }
150 if (group->p2p->cfg->p2p_intra_bss)
151 group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST;
152 if (group->group_formation)
153 group_capab |= P2P_GROUP_CAPAB_GROUP_FORMATION;
154 if (group->p2p->cross_connect)
155 group_capab |= P2P_GROUP_CAPAB_CROSS_CONN;
156 if (group->num_members >= group->cfg->max_clients)
157 group_capab |= P2P_GROUP_CAPAB_GROUP_LIMIT;
158 if (group->cfg->ip_addr_alloc)
159 group_capab |= P2P_GROUP_CAPAB_IP_ADDR_ALLOCATION;
160 p2p_buf_add_capability(ie, dev_capab, group_capab);
161 }
162
163
p2p_group_add_noa(struct wpabuf * ie,struct wpabuf * noa)164 static void p2p_group_add_noa(struct wpabuf *ie, struct wpabuf *noa)
165 {
166 if (noa == NULL)
167 return;
168 /* Notice of Absence */
169 wpabuf_put_u8(ie, P2P_ATTR_NOTICE_OF_ABSENCE);
170 wpabuf_put_le16(ie, wpabuf_len(noa));
171 wpabuf_put_buf(ie, noa);
172 }
173
174
p2p_group_encaps_probe_resp(struct wpabuf * subelems)175 static struct wpabuf * p2p_group_encaps_probe_resp(struct wpabuf *subelems)
176 {
177 struct wpabuf *ie;
178 const u8 *pos, *end;
179 size_t len;
180
181 if (subelems == NULL)
182 return NULL;
183
184 len = wpabuf_len(subelems) + 100;
185
186 ie = wpabuf_alloc(len);
187 if (ie == NULL)
188 return NULL;
189
190 pos = wpabuf_head(subelems);
191 end = pos + wpabuf_len(subelems);
192
193 while (end > pos) {
194 size_t frag_len = end - pos;
195 if (frag_len > 251)
196 frag_len = 251;
197 wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
198 wpabuf_put_u8(ie, 4 + frag_len);
199 wpabuf_put_be32(ie, P2P_IE_VENDOR_TYPE);
200 wpabuf_put_data(ie, pos, frag_len);
201 pos += frag_len;
202 }
203
204 return ie;
205 }
206
207
p2p_group_build_beacon_ie(struct p2p_group * group)208 static struct wpabuf * p2p_group_build_beacon_ie(struct p2p_group *group)
209 {
210 struct wpabuf *ie;
211 u8 *len;
212 size_t extra = 0;
213
214 #ifdef CONFIG_WIFI_DISPLAY
215 if (group->p2p->wfd_ie_beacon)
216 extra = wpabuf_len(group->p2p->wfd_ie_beacon);
217 #endif /* CONFIG_WIFI_DISPLAY */
218
219 if (group->p2p->vendor_elem &&
220 group->p2p->vendor_elem[VENDOR_ELEM_BEACON_P2P_GO])
221 extra += wpabuf_len(group->p2p->vendor_elem[VENDOR_ELEM_BEACON_P2P_GO]);
222
223 ie = wpabuf_alloc(257 + extra);
224 if (ie == NULL)
225 return NULL;
226
227 #ifdef CONFIG_WIFI_DISPLAY
228 if (group->p2p->wfd_ie_beacon)
229 wpabuf_put_buf(ie, group->p2p->wfd_ie_beacon);
230 #endif /* CONFIG_WIFI_DISPLAY */
231
232 if (group->p2p->vendor_elem &&
233 group->p2p->vendor_elem[VENDOR_ELEM_BEACON_P2P_GO])
234 wpabuf_put_buf(ie,
235 group->p2p->vendor_elem[VENDOR_ELEM_BEACON_P2P_GO]);
236
237 len = p2p_buf_add_ie_hdr(ie);
238 p2p_group_add_common_ies(group, ie);
239 p2p_buf_add_device_id(ie, group->p2p->cfg->dev_addr);
240 p2p_group_add_noa(ie, group->noa);
241 p2p_buf_update_ie_hdr(ie, len);
242
243 return ie;
244 }
245
246
247 #ifdef CONFIG_WIFI_DISPLAY
248
p2p_group_get_wfd_ie(struct p2p_group * g)249 struct wpabuf * p2p_group_get_wfd_ie(struct p2p_group *g)
250 {
251 return g->wfd_ie;
252 }
253
254
wifi_display_encaps(struct wpabuf * subelems)255 struct wpabuf * wifi_display_encaps(struct wpabuf *subelems)
256 {
257 struct wpabuf *ie;
258 const u8 *pos, *end;
259
260 if (subelems == NULL)
261 return NULL;
262
263 ie = wpabuf_alloc(wpabuf_len(subelems) + 100);
264 if (ie == NULL)
265 return NULL;
266
267 pos = wpabuf_head(subelems);
268 end = pos + wpabuf_len(subelems);
269
270 while (end > pos) {
271 size_t frag_len = end - pos;
272 if (frag_len > 251)
273 frag_len = 251;
274 wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
275 wpabuf_put_u8(ie, 4 + frag_len);
276 wpabuf_put_be32(ie, WFD_IE_VENDOR_TYPE);
277 wpabuf_put_data(ie, pos, frag_len);
278 pos += frag_len;
279 }
280
281 return ie;
282 }
283
284
wifi_display_add_dev_info_descr(struct wpabuf * buf,struct p2p_group_member * m)285 static int wifi_display_add_dev_info_descr(struct wpabuf *buf,
286 struct p2p_group_member *m)
287 {
288 const u8 *pos, *end;
289 const u8 *dev_info = NULL;
290 const u8 *assoc_bssid = NULL;
291 const u8 *coupled_sink = NULL;
292 u8 zero_addr[ETH_ALEN];
293
294 if (m->wfd_ie == NULL)
295 return 0;
296
297 os_memset(zero_addr, 0, ETH_ALEN);
298 pos = wpabuf_head_u8(m->wfd_ie);
299 end = pos + wpabuf_len(m->wfd_ie);
300 while (end - pos >= 3) {
301 u8 id;
302 u16 len;
303
304 id = *pos++;
305 len = WPA_GET_BE16(pos);
306 pos += 2;
307 if (len > end - pos)
308 break;
309
310 switch (id) {
311 case WFD_SUBELEM_DEVICE_INFO:
312 if (len < 6)
313 break;
314 dev_info = pos;
315 break;
316 case WFD_SUBELEM_ASSOCIATED_BSSID:
317 if (len < ETH_ALEN)
318 break;
319 assoc_bssid = pos;
320 break;
321 case WFD_SUBELEM_COUPLED_SINK:
322 if (len < 1 + ETH_ALEN)
323 break;
324 coupled_sink = pos;
325 break;
326 }
327
328 pos += len;
329 }
330
331 if (dev_info == NULL)
332 return 0;
333
334 wpabuf_put_u8(buf, 23);
335 wpabuf_put_data(buf, m->dev_addr, ETH_ALEN);
336 if (assoc_bssid)
337 wpabuf_put_data(buf, assoc_bssid, ETH_ALEN);
338 else
339 wpabuf_put_data(buf, zero_addr, ETH_ALEN);
340 wpabuf_put_data(buf, dev_info, 2); /* WFD Device Info */
341 wpabuf_put_data(buf, dev_info + 4, 2); /* WFD Device Max Throughput */
342 if (coupled_sink) {
343 wpabuf_put_data(buf, coupled_sink, 1 + ETH_ALEN);
344 } else {
345 wpabuf_put_u8(buf, 0);
346 wpabuf_put_data(buf, zero_addr, ETH_ALEN);
347 }
348
349 return 1;
350 }
351
352
353 static struct wpabuf *
wifi_display_build_go_ie(struct p2p_group * group)354 wifi_display_build_go_ie(struct p2p_group *group)
355 {
356 struct wpabuf *wfd_subelems, *wfd_ie;
357 struct p2p_group_member *m;
358 u8 *len;
359 unsigned int count = 0;
360
361 if (!group->p2p->wfd_ie_probe_resp)
362 return NULL;
363
364 wfd_subelems = wpabuf_alloc(wpabuf_len(group->p2p->wfd_ie_probe_resp) +
365 group->num_members * 24 + 100);
366 if (wfd_subelems == NULL)
367 return NULL;
368 if (group->p2p->wfd_dev_info)
369 wpabuf_put_buf(wfd_subelems, group->p2p->wfd_dev_info);
370 if (group->p2p->wfd_r2_dev_info)
371 wpabuf_put_buf(wfd_subelems, group->p2p->wfd_r2_dev_info);
372 if (group->p2p->wfd_assoc_bssid)
373 wpabuf_put_buf(wfd_subelems,
374 group->p2p->wfd_assoc_bssid);
375 if (group->p2p->wfd_coupled_sink_info)
376 wpabuf_put_buf(wfd_subelems,
377 group->p2p->wfd_coupled_sink_info);
378
379 /* Build WFD Session Info */
380 wpabuf_put_u8(wfd_subelems, WFD_SUBELEM_SESSION_INFO);
381 len = wpabuf_put(wfd_subelems, 2);
382 m = group->members;
383 while (m) {
384 if (wifi_display_add_dev_info_descr(wfd_subelems, m))
385 count++;
386 m = m->next;
387 }
388
389 if (count == 0) {
390 /* No Wi-Fi Display clients - do not include subelement */
391 wfd_subelems->used -= 3;
392 } else {
393 WPA_PUT_BE16(len, (u8 *) wpabuf_put(wfd_subelems, 0) - len -
394 2);
395 p2p_dbg(group->p2p, "WFD: WFD Session Info: %u descriptors",
396 count);
397 }
398
399 wfd_ie = wifi_display_encaps(wfd_subelems);
400 wpabuf_free(wfd_subelems);
401
402 return wfd_ie;
403 }
404
wifi_display_group_update(struct p2p_group * group)405 static void wifi_display_group_update(struct p2p_group *group)
406 {
407 wpabuf_free(group->wfd_ie);
408 group->wfd_ie = wifi_display_build_go_ie(group);
409 }
410
411 #endif /* CONFIG_WIFI_DISPLAY */
412
413
p2p_buf_add_group_info(struct p2p_group * group,struct wpabuf * buf,int max_clients)414 void p2p_buf_add_group_info(struct p2p_group *group, struct wpabuf *buf,
415 int max_clients)
416 {
417 u8 *group_info;
418 int count = 0;
419 struct p2p_group_member *m;
420
421 p2p_dbg(group->p2p, "* P2P Group Info");
422 group_info = wpabuf_put(buf, 0);
423 wpabuf_put_u8(buf, P2P_ATTR_GROUP_INFO);
424 wpabuf_put_le16(buf, 0); /* Length to be filled */
425 for (m = group->members; m; m = m->next) {
426 p2p_client_info(buf, m);
427 count++;
428 if (max_clients >= 0 && count >= max_clients)
429 break;
430 }
431 WPA_PUT_LE16(group_info + 1,
432 (u8 *) wpabuf_put(buf, 0) - group_info - 3);
433 }
434
435
p2p_group_buf_add_id(struct p2p_group * group,struct wpabuf * buf)436 void p2p_group_buf_add_id(struct p2p_group *group, struct wpabuf *buf)
437 {
438 p2p_buf_add_group_id(buf, group->p2p->cfg->dev_addr, group->cfg->ssid,
439 group->cfg->ssid_len);
440 }
441
442
p2p_group_build_probe_resp_ie(struct p2p_group * group)443 static struct wpabuf * p2p_group_build_probe_resp_ie(struct p2p_group *group)
444 {
445 struct wpabuf *p2p_subelems, *ie;
446
447 p2p_subelems = wpabuf_alloc(500);
448 if (p2p_subelems == NULL)
449 return NULL;
450
451 p2p_group_add_common_ies(group, p2p_subelems);
452 p2p_group_add_noa(p2p_subelems, group->noa);
453
454 /* P2P Device Info */
455 p2p_buf_add_device_info(p2p_subelems, group->p2p, NULL);
456
457 /* P2P Group Info: Only when at least one P2P Client is connected */
458 if (group->members)
459 p2p_buf_add_group_info(group, p2p_subelems, -1);
460
461 ie = p2p_group_encaps_probe_resp(p2p_subelems);
462 wpabuf_free(p2p_subelems);
463
464 if (group->p2p->vendor_elem &&
465 group->p2p->vendor_elem[VENDOR_ELEM_PROBE_RESP_P2P_GO]) {
466 struct wpabuf *extra;
467 extra = wpabuf_dup(group->p2p->vendor_elem[VENDOR_ELEM_PROBE_RESP_P2P_GO]);
468 ie = wpabuf_concat(extra, ie);
469 }
470
471 #ifdef CONFIG_WIFI_DISPLAY
472 if (group->wfd_ie) {
473 struct wpabuf *wfd = wpabuf_dup(group->wfd_ie);
474 ie = wpabuf_concat(wfd, ie);
475 }
476 #endif /* CONFIG_WIFI_DISPLAY */
477
478 return ie;
479 }
480
481
p2p_group_update_ies(struct p2p_group * group)482 void p2p_group_update_ies(struct p2p_group *group)
483 {
484 struct wpabuf *beacon_ie;
485 struct wpabuf *probe_resp_ie;
486
487 #ifdef CONFIG_WIFI_DISPLAY
488 wifi_display_group_update(group);
489 #endif /* CONFIG_WIFI_DISPLAY */
490
491 probe_resp_ie = p2p_group_build_probe_resp_ie(group);
492 if (probe_resp_ie == NULL)
493 return;
494 wpa_hexdump_buf(MSG_MSGDUMP, "P2P: Update GO Probe Response P2P IE",
495 probe_resp_ie);
496
497 if (group->beacon_update) {
498 beacon_ie = p2p_group_build_beacon_ie(group);
499 if (beacon_ie)
500 group->beacon_update = 0;
501 wpa_hexdump_buf(MSG_MSGDUMP, "P2P: Update GO Beacon P2P IE",
502 beacon_ie);
503 } else
504 beacon_ie = NULL;
505
506 group->cfg->ie_update(group->cfg->cb_ctx, beacon_ie, probe_resp_ie);
507 }
508
509
510 /**
511 * p2p_build_client_info - Build P2P Client Info Descriptor
512 * @addr: MAC address of the peer device
513 * @p2p_ie: P2P IE from (Re)Association Request
514 * @dev_capab: Buffer for returning Device Capability
515 * @dev_addr: Buffer for returning P2P Device Address
516 * Returns: P2P Client Info Descriptor or %NULL on failure
517 *
518 * This function builds P2P Client Info Descriptor based on the information
519 * available from (Re)Association Request frame. Group owner can use this to
520 * build the P2P Group Info attribute for Probe Response frames.
521 */
p2p_build_client_info(const u8 * addr,struct wpabuf * p2p_ie,u8 * dev_capab,u8 * dev_addr)522 static struct wpabuf * p2p_build_client_info(const u8 *addr,
523 struct wpabuf *p2p_ie,
524 u8 *dev_capab, u8 *dev_addr)
525 {
526 const u8 *spos;
527 struct p2p_message msg;
528 u8 *len_pos;
529 struct wpabuf *buf;
530
531 if (p2p_ie == NULL)
532 return NULL;
533
534 os_memset(&msg, 0, sizeof(msg));
535 if (p2p_parse_p2p_ie(p2p_ie, &msg) ||
536 msg.capability == NULL || msg.p2p_device_info == NULL)
537 return NULL;
538
539 buf = wpabuf_alloc(ETH_ALEN + 1 + 1 + msg.p2p_device_info_len);
540 if (buf == NULL)
541 return NULL;
542
543 *dev_capab = msg.capability[0];
544 os_memcpy(dev_addr, msg.p2p_device_addr, ETH_ALEN);
545
546 spos = msg.p2p_device_info; /* P2P Device address */
547
548 /* P2P Client Info Descriptor */
549 /* Length to be set */
550 len_pos = wpabuf_put(buf, 1);
551 /* P2P Device address */
552 wpabuf_put_data(buf, spos, ETH_ALEN);
553 /* P2P Interface address */
554 wpabuf_put_data(buf, addr, ETH_ALEN);
555 /* Device Capability Bitmap */
556 wpabuf_put_u8(buf, msg.capability[0]);
557 /*
558 * Config Methods, Primary Device Type, Number of Secondary Device
559 * Types, Secondary Device Type List, Device Name copied from
560 * Device Info
561 */
562 wpabuf_put_data(buf, spos + ETH_ALEN,
563 msg.p2p_device_info_len - ETH_ALEN);
564
565 *len_pos = wpabuf_len(buf) - 1;
566
567
568 return buf;
569 }
570
571
p2p_group_remove_member(struct p2p_group * group,const u8 * addr)572 static int p2p_group_remove_member(struct p2p_group *group, const u8 *addr)
573 {
574 struct p2p_group_member *m, *prev;
575
576 if (group == NULL)
577 return 0;
578
579 m = group->members;
580 prev = NULL;
581 while (m) {
582 if (os_memcmp(m->addr, addr, ETH_ALEN) == 0)
583 break;
584 prev = m;
585 m = m->next;
586 }
587
588 if (m == NULL)
589 return 0;
590
591 if (prev)
592 prev->next = m->next;
593 else
594 group->members = m->next;
595 p2p_group_free_member(m);
596 group->num_members--;
597
598 return 1;
599 }
600
601
p2p_group_notif_assoc(struct p2p_group * group,const u8 * addr,const u8 * ie,size_t len)602 int p2p_group_notif_assoc(struct p2p_group *group, const u8 *addr,
603 const u8 *ie, size_t len)
604 {
605 struct p2p_group_member *m;
606
607 if (group == NULL)
608 return -1;
609
610 p2p_add_device(group->p2p, addr, 0, NULL, 0, ie, len, 0);
611
612 m = os_zalloc(sizeof(*m));
613 if (m == NULL)
614 return -1;
615 os_memcpy(m->addr, addr, ETH_ALEN);
616 m->p2p_ie = ieee802_11_vendor_ie_concat(ie, len, P2P_IE_VENDOR_TYPE);
617 if (m->p2p_ie) {
618 m->client_info = p2p_build_client_info(addr, m->p2p_ie,
619 &m->dev_capab,
620 m->dev_addr);
621 }
622 #ifdef CONFIG_WIFI_DISPLAY
623 m->wfd_ie = ieee802_11_vendor_ie_concat(ie, len, WFD_IE_VENDOR_TYPE);
624 #endif /* CONFIG_WIFI_DISPLAY */
625
626 p2p_group_remove_member(group, addr);
627
628 m->next = group->members;
629 group->members = m;
630 group->num_members++;
631 p2p_dbg(group->p2p, "Add client " MACSTR
632 " to group (p2p=%d wfd=%d client_info=%d); num_members=%u/%u",
633 MAC2STR(addr), m->p2p_ie ? 1 : 0, m->wfd_ie ? 1 : 0,
634 m->client_info ? 1 : 0,
635 group->num_members, group->cfg->max_clients);
636 if (group->num_members == group->cfg->max_clients)
637 group->beacon_update = 1;
638 p2p_group_update_ies(group);
639 if (group->num_members == 1)
640 group->cfg->idle_update(group->cfg->cb_ctx, 0);
641
642 return 0;
643 }
644
645
p2p_group_assoc_resp_ie(struct p2p_group * group,u8 status)646 struct wpabuf * p2p_group_assoc_resp_ie(struct p2p_group *group, u8 status)
647 {
648 struct wpabuf *resp;
649 u8 *rlen;
650 size_t extra = 0;
651
652 #ifdef CONFIG_WIFI_DISPLAY
653 if (group->wfd_ie)
654 extra = wpabuf_len(group->wfd_ie);
655 #endif /* CONFIG_WIFI_DISPLAY */
656
657 if (group->p2p->vendor_elem &&
658 group->p2p->vendor_elem[VENDOR_ELEM_P2P_ASSOC_RESP])
659 extra += wpabuf_len(group->p2p->vendor_elem[VENDOR_ELEM_P2P_ASSOC_RESP]);
660
661 /*
662 * (Re)Association Response - P2P IE
663 * Status attribute (shall be present when association request is
664 * denied)
665 * Extended Listen Timing (may be present)
666 */
667 resp = wpabuf_alloc(20 + extra);
668 if (resp == NULL)
669 return NULL;
670
671 #ifdef CONFIG_WIFI_DISPLAY
672 if (group->wfd_ie)
673 wpabuf_put_buf(resp, group->wfd_ie);
674 #endif /* CONFIG_WIFI_DISPLAY */
675
676 if (group->p2p->vendor_elem &&
677 group->p2p->vendor_elem[VENDOR_ELEM_P2P_ASSOC_RESP])
678 wpabuf_put_buf(resp,
679 group->p2p->vendor_elem[VENDOR_ELEM_P2P_ASSOC_RESP]);
680
681 rlen = p2p_buf_add_ie_hdr(resp);
682 if (status != P2P_SC_SUCCESS)
683 p2p_buf_add_status(resp, status);
684 p2p_buf_update_ie_hdr(resp, rlen);
685
686 return resp;
687 }
688
689
p2p_group_notif_disassoc(struct p2p_group * group,const u8 * addr)690 void p2p_group_notif_disassoc(struct p2p_group *group, const u8 *addr)
691 {
692 if (p2p_group_remove_member(group, addr)) {
693 p2p_dbg(group->p2p, "Remove client " MACSTR
694 " from group; num_members=%u/%u",
695 MAC2STR(addr), group->num_members,
696 group->cfg->max_clients);
697 if (group->num_members == group->cfg->max_clients - 1)
698 group->beacon_update = 1;
699 p2p_group_update_ies(group);
700 if (group->num_members == 0)
701 group->cfg->idle_update(group->cfg->cb_ctx, 1);
702 }
703 }
704
705
706 /**
707 * p2p_match_dev_type_member - Match client device type with requested type
708 * @m: Group member
709 * @wps: WPS TLVs from Probe Request frame (concatenated WPS IEs)
710 * Returns: 1 on match, 0 on mismatch
711 *
712 * This function can be used to match the Requested Device Type attribute in
713 * WPS IE with the device types of a group member for deciding whether a GO
714 * should reply to a Probe Request frame.
715 */
p2p_match_dev_type_member(struct p2p_group_member * m,struct wpabuf * wps)716 static int p2p_match_dev_type_member(struct p2p_group_member *m,
717 struct wpabuf *wps)
718 {
719 const u8 *pos, *end;
720 struct wps_parse_attr attr;
721 u8 num_sec;
722
723 if (m->client_info == NULL || wps == NULL)
724 return 0;
725
726 pos = wpabuf_head(m->client_info);
727 end = pos + wpabuf_len(m->client_info);
728
729 pos += 1 + 2 * ETH_ALEN + 1 + 2;
730 if (end - pos < WPS_DEV_TYPE_LEN + 1)
731 return 0;
732
733 if (wps_parse_msg(wps, &attr))
734 return 1; /* assume no Requested Device Type attributes */
735
736 if (attr.num_req_dev_type == 0)
737 return 1; /* no Requested Device Type attributes -> match */
738
739 if (dev_type_list_match(pos, attr.req_dev_type, attr.num_req_dev_type))
740 return 1; /* Match with client Primary Device Type */
741
742 pos += WPS_DEV_TYPE_LEN;
743 num_sec = *pos++;
744 if (end - pos < num_sec * WPS_DEV_TYPE_LEN)
745 return 0;
746 while (num_sec > 0) {
747 num_sec--;
748 if (dev_type_list_match(pos, attr.req_dev_type,
749 attr.num_req_dev_type))
750 return 1; /* Match with client Secondary Device Type */
751 pos += WPS_DEV_TYPE_LEN;
752 }
753
754 /* No matching device type found */
755 return 0;
756 }
757
758
p2p_group_match_dev_type(struct p2p_group * group,struct wpabuf * wps)759 int p2p_group_match_dev_type(struct p2p_group *group, struct wpabuf *wps)
760 {
761 struct p2p_group_member *m;
762
763 if (p2p_match_dev_type(group->p2p, wps))
764 return 1; /* Match with own device type */
765
766 for (m = group->members; m; m = m->next) {
767 if (p2p_match_dev_type_member(m, wps))
768 return 1; /* Match with group client device type */
769 }
770
771 /* No match with Requested Device Type */
772 return 0;
773 }
774
775
p2p_group_match_dev_id(struct p2p_group * group,struct wpabuf * p2p)776 int p2p_group_match_dev_id(struct p2p_group *group, struct wpabuf *p2p)
777 {
778 struct p2p_group_member *m;
779 struct p2p_message msg;
780
781 os_memset(&msg, 0, sizeof(msg));
782 if (p2p_parse_p2p_ie(p2p, &msg))
783 return 1; /* Failed to parse - assume no filter on Device ID */
784
785 if (!msg.device_id)
786 return 1; /* No filter on Device ID */
787
788 if (os_memcmp(msg.device_id, group->p2p->cfg->dev_addr, ETH_ALEN) == 0)
789 return 1; /* Match with our P2P Device Address */
790
791 for (m = group->members; m; m = m->next) {
792 if (os_memcmp(msg.device_id, m->dev_addr, ETH_ALEN) == 0)
793 return 1; /* Match with group client P2P Device Address */
794 }
795
796 /* No match with Device ID */
797 return 0;
798 }
799
800
p2p_group_notif_formation_done(struct p2p_group * group)801 void p2p_group_notif_formation_done(struct p2p_group *group)
802 {
803 if (group == NULL)
804 return;
805 group->group_formation = 0;
806 group->beacon_update = 1;
807 p2p_group_update_ies(group);
808 }
809
810
p2p_group_notif_noa(struct p2p_group * group,const u8 * noa,size_t noa_len)811 int p2p_group_notif_noa(struct p2p_group *group, const u8 *noa,
812 size_t noa_len)
813 {
814 if (noa == NULL) {
815 wpabuf_free(group->noa);
816 group->noa = NULL;
817 } else {
818 if (group->noa) {
819 if (wpabuf_size(group->noa) >= noa_len) {
820 group->noa->used = 0;
821 wpabuf_put_data(group->noa, noa, noa_len);
822 } else {
823 wpabuf_free(group->noa);
824 group->noa = NULL;
825 }
826 }
827
828 if (!group->noa) {
829 group->noa = wpabuf_alloc_copy(noa, noa_len);
830 if (group->noa == NULL)
831 return -1;
832 }
833 }
834
835 group->beacon_update = 1;
836 p2p_group_update_ies(group);
837 return 0;
838 }
839
840
p2p_group_get_client(struct p2p_group * group,const u8 * dev_id)841 static struct p2p_group_member * p2p_group_get_client(struct p2p_group *group,
842 const u8 *dev_id)
843 {
844 struct p2p_group_member *m;
845
846 for (m = group->members; m; m = m->next) {
847 if (os_memcmp(dev_id, m->dev_addr, ETH_ALEN) == 0)
848 return m;
849 }
850
851 return NULL;
852 }
853
854
p2p_group_get_client_interface_addr(struct p2p_group * group,const u8 * dev_addr)855 const u8 * p2p_group_get_client_interface_addr(struct p2p_group *group,
856 const u8 *dev_addr)
857 {
858 struct p2p_group_member *m;
859
860 if (!group)
861 return NULL;
862 m = p2p_group_get_client(group, dev_addr);
863 if (m)
864 return m->addr;
865 return NULL;
866 }
867
868
p2p_group_get_client_iface(struct p2p_group * group,const u8 * interface_addr)869 static struct p2p_group_member * p2p_group_get_client_iface(
870 struct p2p_group *group, const u8 *interface_addr)
871 {
872 struct p2p_group_member *m;
873
874 for (m = group->members; m; m = m->next) {
875 if (os_memcmp(interface_addr, m->addr, ETH_ALEN) == 0)
876 return m;
877 }
878
879 return NULL;
880 }
881
882
p2p_group_get_dev_addr(struct p2p_group * group,const u8 * addr)883 const u8 * p2p_group_get_dev_addr(struct p2p_group *group, const u8 *addr)
884 {
885 struct p2p_group_member *m;
886
887 if (group == NULL)
888 return NULL;
889 m = p2p_group_get_client_iface(group, addr);
890 if (m && !is_zero_ether_addr(m->dev_addr))
891 return m->dev_addr;
892 return NULL;
893 }
894
895
p2p_build_go_disc_req(void)896 static struct wpabuf * p2p_build_go_disc_req(void)
897 {
898 struct wpabuf *buf;
899
900 buf = wpabuf_alloc(100);
901 if (buf == NULL)
902 return NULL;
903
904 p2p_buf_add_action_hdr(buf, P2P_GO_DISC_REQ, 0);
905
906 return buf;
907 }
908
909
p2p_group_go_discover(struct p2p_group * group,const u8 * dev_id,const u8 * searching_dev,int rx_freq)910 int p2p_group_go_discover(struct p2p_group *group, const u8 *dev_id,
911 const u8 *searching_dev, int rx_freq)
912 {
913 struct p2p_group_member *m;
914 struct wpabuf *req;
915 struct p2p_data *p2p = group->p2p;
916 int freq;
917
918 m = p2p_group_get_client(group, dev_id);
919 if (m == NULL || m->client_info == NULL) {
920 p2p_dbg(group->p2p, "Requested client was not in this group "
921 MACSTR, MAC2STR(group->cfg->interface_addr));
922 return -1;
923 }
924
925 if (!(m->dev_capab & P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) {
926 p2p_dbg(group->p2p, "Requested client does not support client discoverability");
927 return -1;
928 }
929
930 p2p_dbg(group->p2p, "Schedule GO Discoverability Request to be sent to "
931 MACSTR, MAC2STR(dev_id));
932
933 req = p2p_build_go_disc_req();
934 if (req == NULL)
935 return -1;
936
937 /* TODO: Should really use group operating frequency here */
938 freq = rx_freq;
939
940 p2p->pending_action_state = P2P_PENDING_GO_DISC_REQ;
941 if (p2p->cfg->send_action(p2p->cfg->cb_ctx, freq, m->addr,
942 group->cfg->interface_addr,
943 group->cfg->interface_addr,
944 wpabuf_head(req), wpabuf_len(req), 200, NULL)
945 < 0)
946 {
947 p2p_dbg(p2p, "Failed to send Action frame");
948 }
949
950 wpabuf_free(req);
951
952 return 0;
953 }
954
955
p2p_group_get_interface_addr(struct p2p_group * group)956 const u8 * p2p_group_get_interface_addr(struct p2p_group *group)
957 {
958 return group->cfg->interface_addr;
959 }
960
961
p2p_group_presence_req(struct p2p_group * group,const u8 * client_interface_addr,const u8 * noa,size_t noa_len)962 u8 p2p_group_presence_req(struct p2p_group *group,
963 const u8 *client_interface_addr,
964 const u8 *noa, size_t noa_len)
965 {
966 struct p2p_group_member *m;
967 u8 curr_noa[50];
968 int curr_noa_len;
969
970 m = p2p_group_get_client_iface(group, client_interface_addr);
971 if (m == NULL || m->client_info == NULL) {
972 p2p_dbg(group->p2p, "Client was not in this group");
973 return P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
974 }
975
976 wpa_hexdump(MSG_DEBUG, "P2P: Presence Request NoA", noa, noa_len);
977
978 if (group->p2p->cfg->get_noa)
979 curr_noa_len = group->p2p->cfg->get_noa(
980 group->p2p->cfg->cb_ctx, group->cfg->interface_addr,
981 curr_noa, sizeof(curr_noa));
982 else
983 curr_noa_len = -1;
984 if (curr_noa_len < 0)
985 p2p_dbg(group->p2p, "Failed to fetch current NoA");
986 else if (curr_noa_len == 0)
987 p2p_dbg(group->p2p, "No NoA being advertized");
988 else
989 wpa_hexdump(MSG_DEBUG, "P2P: Current NoA", curr_noa,
990 curr_noa_len);
991
992 /* TODO: properly process request and store copy */
993 if (curr_noa_len > 0 || curr_noa_len == -1)
994 return P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
995
996 return P2P_SC_SUCCESS;
997 }
998
999
p2p_get_group_num_members(struct p2p_group * group)1000 unsigned int p2p_get_group_num_members(struct p2p_group *group)
1001 {
1002 if (!group)
1003 return 0;
1004
1005 return group->num_members;
1006 }
1007
1008
p2p_client_limit_reached(struct p2p_group * group)1009 int p2p_client_limit_reached(struct p2p_group *group)
1010 {
1011 if (!group || !group->cfg)
1012 return 1;
1013
1014 return group->num_members >= group->cfg->max_clients;
1015 }
1016
1017
p2p_iterate_group_members(struct p2p_group * group,void ** next)1018 const u8 * p2p_iterate_group_members(struct p2p_group *group, void **next)
1019 {
1020 struct p2p_group_member *iter = *next;
1021
1022 if (!iter)
1023 iter = group->members;
1024 else
1025 iter = iter->next;
1026
1027 *next = iter;
1028
1029 if (!iter)
1030 return NULL;
1031
1032 return iter->dev_addr;
1033 }
1034
1035
p2p_group_is_client_connected(struct p2p_group * group,const u8 * dev_addr)1036 int p2p_group_is_client_connected(struct p2p_group *group, const u8 *dev_addr)
1037 {
1038 struct p2p_group_member *m;
1039
1040 for (m = group->members; m; m = m->next) {
1041 if (os_memcmp(m->dev_addr, dev_addr, ETH_ALEN) == 0)
1042 return 1;
1043 }
1044
1045 return 0;
1046 }
1047
1048
p2p_group_is_group_id_match(struct p2p_group * group,const u8 * group_id,size_t group_id_len)1049 int p2p_group_is_group_id_match(struct p2p_group *group, const u8 *group_id,
1050 size_t group_id_len)
1051 {
1052 if (group_id_len != ETH_ALEN + group->cfg->ssid_len)
1053 return 0;
1054 if (os_memcmp(group_id, group->p2p->cfg->dev_addr, ETH_ALEN) != 0)
1055 return 0;
1056 return os_memcmp(group_id + ETH_ALEN, group->cfg->ssid,
1057 group->cfg->ssid_len) == 0;
1058 }
1059
1060
p2p_group_force_beacon_update_ies(struct p2p_group * group)1061 void p2p_group_force_beacon_update_ies(struct p2p_group *group)
1062 {
1063 group->beacon_update = 1;
1064 p2p_group_update_ies(group);
1065 }
1066
1067
p2p_group_get_freq(struct p2p_group * group)1068 int p2p_group_get_freq(struct p2p_group *group)
1069 {
1070 return group->cfg->freq;
1071 }
1072
1073
p2p_group_get_config(struct p2p_group * group)1074 const struct p2p_group_config * p2p_group_get_config(struct p2p_group *group)
1075 {
1076 return group->cfg;
1077 }
1078
1079
p2p_loop_on_all_groups(struct p2p_data * p2p,int (* group_callback)(struct p2p_group * group,void * user_data),void * user_data)1080 void p2p_loop_on_all_groups(struct p2p_data *p2p,
1081 int (*group_callback)(struct p2p_group *group,
1082 void *user_data),
1083 void *user_data)
1084 {
1085 unsigned int i;
1086
1087 for (i = 0; i < p2p->num_groups; i++) {
1088 if (!group_callback(p2p->groups[i], user_data))
1089 break;
1090 }
1091 }
1092
1093
p2p_group_get_common_freqs(struct p2p_group * group,int * common_freqs,unsigned int * num)1094 int p2p_group_get_common_freqs(struct p2p_group *group, int *common_freqs,
1095 unsigned int *num)
1096
1097 {
1098 struct p2p_channels intersect, res;
1099 struct p2p_group_member *m;
1100
1101 if (!group || !common_freqs || !num)
1102 return -1;
1103
1104 os_memset(&intersect, 0, sizeof(intersect));
1105 os_memset(&res, 0, sizeof(res));
1106
1107 p2p_channels_union(&intersect, &group->p2p->cfg->channels,
1108 &intersect);
1109
1110 p2p_channels_dump(group->p2p,
1111 "Group common freqs before iterating members",
1112 &intersect);
1113
1114 for (m = group->members; m; m = m->next) {
1115 struct p2p_device *dev;
1116
1117 dev = p2p_get_device(group->p2p, m->dev_addr);
1118 if (!dev || dev->channels.reg_classes == 0)
1119 continue;
1120
1121 p2p_channels_intersect(&intersect, &dev->channels, &res);
1122 intersect = res;
1123 }
1124
1125 p2p_channels_dump(group->p2p, "Group common channels", &intersect);
1126
1127 os_memset(common_freqs, 0, *num * sizeof(int));
1128 *num = p2p_channels_to_freqs(&intersect, common_freqs, *num);
1129
1130 return 0;
1131 }
1132