1 /*
2 * Wi-Fi Direct - P2P Invitation procedure
3 * Copyright (c) 2010, Atheros Communications
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15 #include "includes.h"
16
17 #include "common.h"
18 #include "common/ieee802_11_defs.h"
19 #include "p2p_i.h"
20 #include "p2p.h"
21
22
p2p_build_invitation_req(struct p2p_data * p2p,struct p2p_device * peer,const u8 * go_dev_addr)23 static struct wpabuf * p2p_build_invitation_req(struct p2p_data *p2p,
24 struct p2p_device *peer,
25 const u8 *go_dev_addr)
26 {
27 struct wpabuf *buf;
28 u8 *len;
29 const u8 *dev_addr;
30
31 buf = wpabuf_alloc(1000);
32 if (buf == NULL)
33 return NULL;
34
35 peer->dialog_token++;
36 if (peer->dialog_token == 0)
37 peer->dialog_token = 1;
38 p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_REQ,
39 peer->dialog_token);
40
41 len = p2p_buf_add_ie_hdr(buf);
42 if (p2p->inv_role == P2P_INVITE_ROLE_ACTIVE_GO || !p2p->inv_persistent)
43 p2p_buf_add_config_timeout(buf, 0, 0);
44 else
45 p2p_buf_add_config_timeout(buf, 100, 20);
46 p2p_buf_add_invitation_flags(buf, p2p->inv_persistent ?
47 P2P_INVITATION_FLAGS_TYPE : 0);
48 p2p_buf_add_operating_channel(buf, p2p->cfg->country,
49 p2p->op_reg_class, p2p->op_channel);
50 if (p2p->inv_bssid_set)
51 p2p_buf_add_group_bssid(buf, p2p->inv_bssid);
52 p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels);
53 if (go_dev_addr)
54 dev_addr = go_dev_addr;
55 else if (p2p->inv_role == P2P_INVITE_ROLE_CLIENT)
56 dev_addr = peer->info.p2p_device_addr;
57 else
58 #ifdef ANDROID_BRCM_P2P_PATCH
59 dev_addr = p2p->cfg->p2p_dev_addr;
60 #else
61 dev_addr = p2p->cfg->dev_addr;
62 #endif
63 p2p_buf_add_group_id(buf, dev_addr, p2p->inv_ssid, p2p->inv_ssid_len);
64 p2p_buf_add_device_info(buf, p2p, peer);
65 p2p_buf_update_ie_hdr(buf, len);
66
67 return buf;
68 }
69
70
p2p_build_invitation_resp(struct p2p_data * p2p,struct p2p_device * peer,u8 dialog_token,u8 status,const u8 * group_bssid,u8 reg_class,u8 channel,struct p2p_channels * channels)71 static struct wpabuf * p2p_build_invitation_resp(struct p2p_data *p2p,
72 struct p2p_device *peer,
73 u8 dialog_token, u8 status,
74 const u8 *group_bssid,
75 u8 reg_class, u8 channel,
76 struct p2p_channels *channels)
77 {
78 struct wpabuf *buf;
79 u8 *len;
80
81 buf = wpabuf_alloc(1000);
82 if (buf == NULL)
83 return NULL;
84
85 p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_RESP,
86 dialog_token);
87
88 len = p2p_buf_add_ie_hdr(buf);
89 p2p_buf_add_status(buf, status);
90 p2p_buf_add_config_timeout(buf, 0, 0); /* FIX */
91 if (reg_class && channel)
92 p2p_buf_add_operating_channel(buf, p2p->cfg->country,
93 reg_class, channel);
94 if (group_bssid)
95 p2p_buf_add_group_bssid(buf, group_bssid);
96 if (channels)
97 p2p_buf_add_channel_list(buf, p2p->cfg->country, channels);
98 p2p_buf_update_ie_hdr(buf, len);
99
100 return buf;
101 }
102
103
p2p_process_invitation_req(struct p2p_data * p2p,const u8 * sa,const u8 * data,size_t len,int rx_freq)104 void p2p_process_invitation_req(struct p2p_data *p2p, const u8 *sa,
105 const u8 *data, size_t len, int rx_freq)
106 {
107 struct p2p_device *dev;
108 struct p2p_message msg;
109 struct wpabuf *resp = NULL;
110 u8 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
111 int freq;
112 int go = 0;
113 u8 group_bssid[ETH_ALEN], *bssid;
114 int op_freq = 0;
115 u8 reg_class = 0, channel = 0;
116 struct p2p_channels intersection, *channels = NULL;
117 int persistent;
118
119 os_memset(group_bssid, 0, sizeof(group_bssid));
120
121 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
122 "P2P: Received Invitation Request from " MACSTR " (freq=%d)",
123 MAC2STR(sa), rx_freq);
124
125 if (p2p_parse(data, len, &msg))
126 return;
127
128 dev = p2p_get_device(p2p, sa);
129 if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) {
130 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
131 "P2P: Invitation Request from unknown peer "
132 MACSTR, MAC2STR(sa));
133
134 if (p2p_add_device(p2p, sa, rx_freq, 0, data + 1, len - 1)) {
135 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
136 "P2P: Invitation Request add device failed "
137 MACSTR, MAC2STR(sa));
138 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
139 goto fail;
140 }
141
142 dev = p2p_get_device(p2p, sa);
143 if (dev == NULL) {
144 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
145 "P2P: Reject Invitation Request from unknown "
146 "peer " MACSTR, MAC2STR(sa));
147 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
148 goto fail;
149 }
150 }
151
152 if (!msg.group_id || !msg.channel_list) {
153 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
154 "P2P: Mandatory attribute missing in Invitation "
155 "Request from " MACSTR, MAC2STR(sa));
156 status = P2P_SC_FAIL_INVALID_PARAMS;
157 goto fail;
158 }
159
160 if (msg.invitation_flags)
161 persistent = *msg.invitation_flags & P2P_INVITATION_FLAGS_TYPE;
162 else {
163 /* Invitation Flags is a mandatory attribute starting from P2P
164 * spec 1.06. As a backwards compatibility mechanism, assume
165 * the request was for a persistent group if the attribute is
166 * missing.
167 */
168 wpa_printf(MSG_DEBUG, "P2P: Mandatory Invitation Flags "
169 "attribute missing from Invitation Request");
170 persistent = 1;
171 }
172
173 if (p2p_peer_channels_check(p2p, &p2p->cfg->channels, dev,
174 msg.channel_list, msg.channel_list_len) <
175 0) {
176 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
177 "P2P: No common channels found");
178 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
179 goto fail;
180 }
181
182 if (p2p->cfg->invitation_process) {
183 status = p2p->cfg->invitation_process(
184 p2p->cfg->cb_ctx, sa, msg.group_bssid, msg.group_id,
185 msg.group_id + ETH_ALEN, msg.group_id_len - ETH_ALEN,
186 &go, group_bssid, &op_freq, persistent);
187 }
188
189 if (op_freq) {
190 if (p2p_freq_to_channel(p2p->cfg->country, op_freq,
191 ®_class, &channel) < 0) {
192 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
193 "P2P: Unknown forced freq %d MHz from "
194 "invitation_process()", op_freq);
195 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
196 goto fail;
197 }
198
199 p2p_channels_intersect(&p2p->cfg->channels, &dev->channels,
200 &intersection);
201 if (!p2p_channels_includes(&intersection, reg_class, channel))
202 {
203 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
204 "P2P: forced freq %d MHz not in the supported "
205 "channels interaction", op_freq);
206 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
207 goto fail;
208 }
209
210 if (status == P2P_SC_SUCCESS)
211 channels = &intersection;
212 } else {
213 op_freq = p2p_channel_to_freq(p2p->cfg->country,
214 p2p->cfg->op_reg_class,
215 p2p->cfg->op_channel);
216 if (op_freq < 0) {
217 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
218 "P2P: Unknown operational channel "
219 "(country=%c%c reg_class=%u channel=%u)",
220 p2p->cfg->country[0], p2p->cfg->country[1],
221 p2p->cfg->op_reg_class, p2p->cfg->op_channel);
222 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
223 goto fail;
224 }
225
226 p2p_channels_intersect(&p2p->cfg->channels, &dev->channels,
227 &intersection);
228 if (status == P2P_SC_SUCCESS) {
229 reg_class = p2p->cfg->op_reg_class;
230 channel = p2p->cfg->op_channel;
231 channels = &intersection;
232 }
233 }
234
235 fail:
236 if (go && status == P2P_SC_SUCCESS && !is_zero_ether_addr(group_bssid))
237 bssid = group_bssid;
238 else
239 bssid = NULL;
240 resp = p2p_build_invitation_resp(p2p, dev, msg.dialog_token, status,
241 bssid, reg_class, channel, channels);
242
243 if (resp == NULL)
244 goto out;
245
246 if (rx_freq > 0)
247 freq = rx_freq;
248 else
249 freq = p2p_channel_to_freq(p2p->cfg->country,
250 p2p->cfg->reg_class,
251 p2p->cfg->channel);
252 if (freq < 0) {
253 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
254 "P2P: Unknown regulatory class/channel");
255 goto out;
256 }
257
258 /*
259 * Store copy of invitation data to be used when processing TX status
260 * callback for the Acton frame.
261 */
262 os_memcpy(p2p->inv_sa, sa, ETH_ALEN);
263 if (msg.group_bssid) {
264 os_memcpy(p2p->inv_group_bssid, msg.group_bssid, ETH_ALEN);
265 p2p->inv_group_bssid_ptr = p2p->inv_group_bssid;
266 } else
267 p2p->inv_group_bssid_ptr = NULL;
268 if (msg.group_id_len - ETH_ALEN <= 32) {
269 os_memcpy(p2p->inv_ssid, msg.group_id + ETH_ALEN,
270 msg.group_id_len - ETH_ALEN);
271 p2p->inv_ssid_len = msg.group_id_len - ETH_ALEN;
272 }
273 os_memcpy(p2p->inv_go_dev_addr, msg.group_id, ETH_ALEN);
274 p2p->inv_status = status;
275 p2p->inv_op_freq = op_freq;
276
277 p2p->pending_action_state = P2P_PENDING_INVITATION_RESPONSE;
278 if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr,
279 p2p->cfg->dev_addr,
280 wpabuf_head(resp), wpabuf_len(resp), 200) < 0) {
281 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
282 "P2P: Failed to send Action frame");
283 }
284
285 out:
286 wpabuf_free(resp);
287 p2p_parse_free(&msg);
288 }
289
290
p2p_process_invitation_resp(struct p2p_data * p2p,const u8 * sa,const u8 * data,size_t len)291 void p2p_process_invitation_resp(struct p2p_data *p2p, const u8 *sa,
292 const u8 *data, size_t len)
293 {
294 struct p2p_device *dev;
295 struct p2p_message msg;
296
297 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
298 "P2P: Received Invitation Response from " MACSTR,
299 MAC2STR(sa));
300
301 dev = p2p_get_device(p2p, sa);
302 if (dev == NULL) {
303 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
304 "P2P: Ignore Invitation Response from unknown peer "
305 MACSTR, MAC2STR(sa));
306 return;
307 }
308
309 if (dev != p2p->invite_peer) {
310 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
311 "P2P: Ignore unexpected Invitation Response from peer "
312 MACSTR, MAC2STR(sa));
313 return;
314 }
315
316 if (p2p_parse(data, len, &msg))
317 return;
318
319 if (!msg.status) {
320 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
321 "P2P: Mandatory Status attribute missing in "
322 "Invitation Response from " MACSTR, MAC2STR(sa));
323 p2p_parse_free(&msg);
324 return;
325 }
326
327 if (p2p->cfg->invitation_result)
328 p2p->cfg->invitation_result(p2p->cfg->cb_ctx, *msg.status,
329 msg.group_bssid);
330
331 p2p_parse_free(&msg);
332
333 p2p_clear_timeout(p2p);
334 p2p_set_state(p2p, P2P_IDLE);
335 p2p->invite_peer = NULL;
336 }
337
338
p2p_invite_send(struct p2p_data * p2p,struct p2p_device * dev,const u8 * go_dev_addr)339 int p2p_invite_send(struct p2p_data *p2p, struct p2p_device *dev,
340 const u8 *go_dev_addr)
341 {
342 struct wpabuf *req;
343 int freq;
344
345 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq;
346 if (freq <= 0) {
347 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
348 "P2P: No Listen/Operating frequency known for the "
349 "peer " MACSTR " to send Invitation Request",
350 MAC2STR(dev->info.p2p_device_addr));
351 return -1;
352 }
353
354 req = p2p_build_invitation_req(p2p, dev, go_dev_addr);
355 if (req == NULL)
356 return -1;
357 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
358 "P2P: Sending Invitation Request");
359 p2p_set_state(p2p, P2P_INVITE);
360 p2p->pending_action_state = P2P_PENDING_INVITATION_REQUEST;
361 p2p->invite_peer = dev;
362 dev->invitation_reqs++;
363 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr,
364 p2p->cfg->dev_addr, dev->info.p2p_device_addr,
365 wpabuf_head(req), wpabuf_len(req), 200) < 0) {
366 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
367 "P2P: Failed to send Action frame");
368 /* Use P2P find to recover and retry */
369 p2p_set_timeout(p2p, 0, 0);
370 }
371
372 wpabuf_free(req);
373
374 return 0;
375 }
376
377
p2p_invitation_req_cb(struct p2p_data * p2p,int success)378 void p2p_invitation_req_cb(struct p2p_data *p2p, int success)
379 {
380 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
381 "P2P: Invitation Request TX callback: success=%d", success);
382
383 if (p2p->invite_peer == NULL) {
384 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
385 "P2P: No pending Invite");
386 return;
387 }
388
389 /*
390 * Use P2P find, if needed, to find the other device from its listen
391 * channel.
392 */
393 p2p_set_state(p2p, P2P_INVITE);
394 p2p_set_timeout(p2p, 0, 100000);
395 }
396
397
p2p_invitation_resp_cb(struct p2p_data * p2p,int success)398 void p2p_invitation_resp_cb(struct p2p_data *p2p, int success)
399 {
400 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
401 "P2P: Invitation Response TX callback: success=%d", success);
402 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
403
404 if (success && p2p->cfg->invitation_received) {
405 p2p->cfg->invitation_received(p2p->cfg->cb_ctx,
406 p2p->inv_sa,
407 p2p->inv_group_bssid_ptr,
408 p2p->inv_ssid, p2p->inv_ssid_len,
409 p2p->inv_go_dev_addr,
410 p2p->inv_status,
411 p2p->inv_op_freq);
412 }
413 }
414
415
p2p_invite(struct p2p_data * p2p,const u8 * peer,enum p2p_invite_role role,const u8 * bssid,const u8 * ssid,size_t ssid_len,unsigned int force_freq,const u8 * go_dev_addr,int persistent_group)416 int p2p_invite(struct p2p_data *p2p, const u8 *peer, enum p2p_invite_role role,
417 const u8 *bssid, const u8 *ssid, size_t ssid_len,
418 unsigned int force_freq, const u8 *go_dev_addr,
419 int persistent_group)
420 {
421 struct p2p_device *dev;
422
423 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
424 "P2P: Request to invite peer " MACSTR " role=%d persistent=%d "
425 "force_freq=%u",
426 MAC2STR(peer), role, persistent_group, force_freq);
427 if (bssid)
428 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
429 "P2P: Invitation for BSSID " MACSTR, MAC2STR(bssid));
430 if (go_dev_addr) {
431 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
432 "P2P: Invitation for GO Device Address " MACSTR,
433 MAC2STR(go_dev_addr));
434 os_memcpy(p2p->invite_go_dev_addr_buf, go_dev_addr, ETH_ALEN);
435 p2p->invite_go_dev_addr = p2p->invite_go_dev_addr_buf;
436 } else
437 p2p->invite_go_dev_addr = NULL;
438 wpa_hexdump_ascii(MSG_DEBUG, "P2P: Invitation for SSID",
439 ssid, ssid_len);
440
441 dev = p2p_get_device(p2p, peer);
442 if (dev == NULL || (dev->listen_freq <= 0 && dev->oper_freq <= 0)) {
443 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
444 "P2P: Cannot invite unknown P2P Device " MACSTR,
445 MAC2STR(peer));
446 return -1;
447 }
448
449 if (dev->flags & P2P_DEV_GROUP_CLIENT_ONLY) {
450 if (!(dev->info.dev_capab &
451 P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) {
452 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
453 "P2P: Cannot invite a P2P Device " MACSTR
454 " that is in a group and is not discoverable",
455 MAC2STR(peer));
456 }
457 /* TODO: use device discoverability request through GO */
458 }
459
460 dev->invitation_reqs = 0;
461
462 if (force_freq) {
463 if (p2p_freq_to_channel(p2p->cfg->country, force_freq,
464 &p2p->op_reg_class, &p2p->op_channel) <
465 0) {
466 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
467 "P2P: Unsupported frequency %u MHz",
468 force_freq);
469 return -1;
470 }
471 p2p->channels.reg_classes = 1;
472 p2p->channels.reg_class[0].channels = 1;
473 p2p->channels.reg_class[0].reg_class = p2p->op_reg_class;
474 p2p->channels.reg_class[0].channel[0] = p2p->op_channel;
475 } else {
476 p2p->op_reg_class = p2p->cfg->op_reg_class;
477 p2p->op_channel = p2p->cfg->op_channel;
478 os_memcpy(&p2p->channels, &p2p->cfg->channels,
479 sizeof(struct p2p_channels));
480 }
481
482 if (p2p->state != P2P_IDLE)
483 p2p_stop_find(p2p);
484
485 p2p->inv_role = role;
486 p2p->inv_bssid_set = bssid != NULL;
487 if (bssid)
488 os_memcpy(p2p->inv_bssid, bssid, ETH_ALEN);
489 os_memcpy(p2p->inv_ssid, ssid, ssid_len);
490 p2p->inv_ssid_len = ssid_len;
491 p2p->inv_persistent = persistent_group;
492 return p2p_invite_send(p2p, dev, go_dev_addr);
493 }
494