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