2 * Wi-Fi Direct - P2P Invitation procedure
3 * Copyright (c) 2010, Atheros Communications
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.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
18 #include "common/ieee802_11_defs.h"
23 static struct wpabuf * p2p_build_invitation_req(struct p2p_data *p2p,
24 struct p2p_device *peer,
25 const u8 *go_dev_addr)
31 buf = wpabuf_alloc(1000);
36 if (peer->dialog_token == 0)
37 peer->dialog_token = 1;
38 p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_REQ,
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);
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);
54 dev_addr = go_dev_addr;
55 else if (p2p->inv_role == P2P_INVITE_ROLE_CLIENT)
56 dev_addr = peer->p2p_device_addr;
58 dev_addr = p2p->cfg->dev_addr;
59 p2p_buf_add_group_id(buf, dev_addr, p2p->inv_ssid, p2p->inv_ssid_len);
60 p2p_buf_add_device_info(buf, p2p, peer);
61 p2p_buf_update_ie_hdr(buf, len);
67 static struct wpabuf * p2p_build_invitation_resp(struct p2p_data *p2p,
68 struct p2p_device *peer,
69 u8 dialog_token, u8 status,
70 const u8 *group_bssid,
71 u8 reg_class, u8 channel,
72 struct p2p_channels *channels)
77 buf = wpabuf_alloc(1000);
81 p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_RESP,
84 len = p2p_buf_add_ie_hdr(buf);
85 p2p_buf_add_status(buf, status);
86 p2p_buf_add_config_timeout(buf, 0, 0); /* FIX */
87 if (reg_class && channel)
88 p2p_buf_add_operating_channel(buf, p2p->cfg->country,
91 p2p_buf_add_group_bssid(buf, group_bssid);
93 p2p_buf_add_channel_list(buf, p2p->cfg->country, channels);
94 p2p_buf_update_ie_hdr(buf, len);
100 void p2p_process_invitation_req(struct p2p_data *p2p, const u8 *sa,
101 const u8 *data, size_t len, int rx_freq)
103 struct p2p_device *dev;
104 struct p2p_message msg;
105 struct wpabuf *resp = NULL;
106 u8 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
109 u8 group_bssid[ETH_ALEN], *bssid;
111 u8 reg_class = 0, channel = 0;
112 struct p2p_channels intersection, *channels = NULL;
115 os_memset(group_bssid, 0, sizeof(group_bssid));
117 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
118 "P2P: Received Invitation Request from " MACSTR " (freq=%d)",
119 MAC2STR(sa), rx_freq);
121 if (p2p_parse(data, len, &msg))
124 dev = p2p_get_device(p2p, sa);
125 if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) {
126 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
127 "P2P: Invitation Request from unknown peer "
128 MACSTR, MAC2STR(sa));
130 if (p2p_add_device(p2p, sa, rx_freq, 0, data + 1, len - 1)) {
131 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
132 "P2P: Invitation Request add device failed "
133 MACSTR, MAC2STR(sa));
134 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
138 dev = p2p_get_device(p2p, sa);
140 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
141 "P2P: Reject Invitation Request from unknown "
142 "peer " MACSTR, MAC2STR(sa));
143 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
148 if (!msg.group_id || !msg.channel_list) {
149 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
150 "P2P: Mandatory attribute missing in Invitation "
151 "Request from " MACSTR, MAC2STR(sa));
152 status = P2P_SC_FAIL_INVALID_PARAMS;
156 if (msg.invitation_flags)
157 persistent = *msg.invitation_flags & P2P_INVITATION_FLAGS_TYPE;
159 /* Invitation Flags is a mandatory attribute starting from P2P
160 * spec 1.06. As a backwards compatibility mechanism, assume
161 * the request was for a persistent group if the attribute is
164 wpa_printf(MSG_DEBUG, "P2P: Mandatory Invitation Flags "
165 "attribute missing from Invitation Request");
169 if (p2p_peer_channels_check(p2p, &p2p->cfg->channels, dev,
170 msg.channel_list, msg.channel_list_len) <
172 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
173 "P2P: No common channels found");
174 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
178 if (p2p->cfg->invitation_process) {
179 status = p2p->cfg->invitation_process(
180 p2p->cfg->cb_ctx, sa, msg.group_bssid, msg.group_id,
181 msg.group_id + ETH_ALEN, msg.group_id_len - ETH_ALEN,
182 &go, group_bssid, &op_freq, persistent);
186 if (p2p_freq_to_channel(p2p->cfg->country, op_freq,
187 ®_class, &channel) < 0) {
188 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
189 "P2P: Unknown forced freq %d MHz from "
190 "invitation_process()", op_freq);
191 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
195 p2p_channels_intersect(&p2p->cfg->channels, &dev->channels,
197 if (!p2p_channels_includes(&intersection, reg_class, channel))
199 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
200 "P2P: forced freq %d MHz not in the supported "
201 "channels interaction", op_freq);
202 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
206 if (status == P2P_SC_SUCCESS)
207 channels = &intersection;
209 op_freq = p2p_channel_to_freq(p2p->cfg->country,
210 p2p->cfg->op_reg_class,
211 p2p->cfg->op_channel);
213 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
214 "P2P: Unknown operational channel "
215 "(country=%c%c reg_class=%u channel=%u)",
216 p2p->cfg->country[0], p2p->cfg->country[1],
217 p2p->cfg->op_reg_class, p2p->cfg->op_channel);
218 status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
222 p2p_channels_intersect(&p2p->cfg->channels, &dev->channels,
224 if (status == P2P_SC_SUCCESS) {
225 reg_class = p2p->cfg->op_reg_class;
226 channel = p2p->cfg->op_channel;
227 channels = &intersection;
232 if (go && status == P2P_SC_SUCCESS && !is_zero_ether_addr(group_bssid))
236 resp = p2p_build_invitation_resp(p2p, dev, msg.dialog_token, status,
237 bssid, reg_class, channel, channels);
245 freq = p2p_channel_to_freq(p2p->cfg->country,
249 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
250 "P2P: Unknown regulatory class/channel");
255 * Store copy of invitation data to be used when processing TX status
256 * callback for the Acton frame.
258 os_memcpy(p2p->inv_sa, sa, ETH_ALEN);
259 if (msg.group_bssid) {
260 os_memcpy(p2p->inv_group_bssid, msg.group_bssid, ETH_ALEN);
261 p2p->inv_group_bssid_ptr = p2p->inv_group_bssid;
263 p2p->inv_group_bssid_ptr = NULL;
264 if (msg.group_id_len - ETH_ALEN <= 32) {
265 os_memcpy(p2p->inv_ssid, msg.group_id + ETH_ALEN,
266 msg.group_id_len - ETH_ALEN);
267 p2p->inv_ssid_len = msg.group_id_len - ETH_ALEN;
269 os_memcpy(p2p->inv_go_dev_addr, msg.group_id, ETH_ALEN);
270 p2p->inv_status = status;
271 p2p->inv_op_freq = op_freq;
273 p2p->pending_action_state = P2P_PENDING_INVITATION_RESPONSE;
274 if (p2p->cfg->send_action(p2p->cfg->cb_ctx, freq, sa,
275 p2p->cfg->dev_addr, p2p->cfg->dev_addr,
276 wpabuf_head(resp), wpabuf_len(resp), 200) <
278 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
279 "P2P: Failed to send Action frame");
284 p2p_parse_free(&msg);
288 void p2p_process_invitation_resp(struct p2p_data *p2p, const u8 *sa,
289 const u8 *data, size_t len)
291 struct p2p_device *dev;
292 struct p2p_message msg;
294 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
295 "P2P: Received Invitation Response from " MACSTR,
298 dev = p2p_get_device(p2p, sa);
300 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
301 "P2P: Ignore Invitation Response from unknown peer "
302 MACSTR, MAC2STR(sa));
306 if (dev != p2p->invite_peer) {
307 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
308 "P2P: Ignore unexpected Invitation Response from peer "
309 MACSTR, MAC2STR(sa));
313 if (p2p_parse(data, len, &msg))
317 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
318 "P2P: Mandatory Status attribute missing in "
319 "Invitation Response from " MACSTR, MAC2STR(sa));
320 p2p_parse_free(&msg);
324 if (p2p->cfg->invitation_result)
325 p2p->cfg->invitation_result(p2p->cfg->cb_ctx, *msg.status,
328 p2p_parse_free(&msg);
330 p2p_clear_timeout(p2p);
331 p2p_set_state(p2p, P2P_IDLE);
332 p2p->invite_peer = NULL;
336 int p2p_invite_send(struct p2p_data *p2p, struct p2p_device *dev,
337 const u8 *go_dev_addr)
342 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq;
344 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
345 "P2P: No Listen/Operating frequency known for the "
346 "peer " MACSTR " to send Invitation Request",
347 MAC2STR(dev->p2p_device_addr));
351 req = p2p_build_invitation_req(p2p, dev, go_dev_addr);
354 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
355 "P2P: Sending Invitation Request");
356 p2p_set_state(p2p, P2P_INVITE);
357 p2p->pending_action_state = P2P_PENDING_INVITATION_REQUEST;
358 p2p->invite_peer = dev;
359 dev->invitation_reqs++;
360 if (p2p->cfg->send_action(p2p->cfg->cb_ctx, freq,
361 dev->p2p_device_addr, p2p->cfg->dev_addr,
362 dev->p2p_device_addr,
363 wpabuf_head(req), wpabuf_len(req), 200) < 0)
365 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
366 "P2P: Failed to send Action frame");
367 /* Use P2P find to recover and retry */
368 p2p_set_timeout(p2p, 0, 0);
377 void p2p_invitation_req_cb(struct p2p_data *p2p, int success)
379 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
380 "P2P: Invitation Request TX callback: success=%d", success);
382 if (p2p->invite_peer == NULL) {
383 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
384 "P2P: No pending Invite");
389 * Use P2P find, if needed, to find the other device from its listen
392 p2p_set_state(p2p, P2P_INVITE);
393 p2p_set_timeout(p2p, 0, 100000);
397 void p2p_invitation_resp_cb(struct p2p_data *p2p, int success)
399 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
400 "P2P: Invitation Response TX callback: success=%d", success);
401 p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
403 if (success && p2p->cfg->invitation_received) {
404 p2p->cfg->invitation_received(p2p->cfg->cb_ctx,
406 p2p->inv_group_bssid_ptr,
407 p2p->inv_ssid, p2p->inv_ssid_len,
408 p2p->inv_go_dev_addr,
415 int p2p_invite(struct p2p_data *p2p, const u8 *peer, enum p2p_invite_role role,
416 const u8 *bssid, const u8 *ssid, size_t ssid_len,
417 unsigned int force_freq, const u8 *go_dev_addr,
418 int persistent_group)
420 struct p2p_device *dev;
422 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
423 "P2P: Request to invite peer " MACSTR " role=%d persistent=%d "
425 MAC2STR(peer), role, persistent_group, force_freq);
427 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
428 "P2P: Invitation for BSSID " MACSTR, MAC2STR(bssid));
430 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
431 "P2P: Invitation for GO Device Address " MACSTR,
432 MAC2STR(go_dev_addr));
433 os_memcpy(p2p->invite_go_dev_addr_buf, go_dev_addr, ETH_ALEN);
434 p2p->invite_go_dev_addr = p2p->invite_go_dev_addr_buf;
436 p2p->invite_go_dev_addr = NULL;
437 wpa_hexdump_ascii(MSG_DEBUG, "P2P: Invitation for SSID",
440 dev = p2p_get_device(p2p, peer);
441 if (dev == NULL || (dev->listen_freq <= 0 && dev->oper_freq <= 0)) {
442 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
443 "P2P: Cannot invite unknown P2P Device " MACSTR,
448 if (dev->flags & P2P_DEV_GROUP_CLIENT_ONLY) {
449 if (!(dev->dev_capab & P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) {
450 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
451 "P2P: Cannot invite a P2P Device " MACSTR
452 " that is in a group and is not discoverable",
455 /* TODO: use device discoverability request through GO */
458 dev->invitation_reqs = 0;
461 if (p2p_freq_to_channel(p2p->cfg->country, force_freq,
462 &p2p->op_reg_class, &p2p->op_channel) <
464 wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
465 "P2P: Unsupported frequency %u MHz",
469 p2p->channels.reg_classes = 1;
470 p2p->channels.reg_class[0].channels = 1;
471 p2p->channels.reg_class[0].reg_class = p2p->op_reg_class;
472 p2p->channels.reg_class[0].channel[0] = p2p->op_channel;
474 p2p->op_reg_class = p2p->cfg->op_reg_class;
475 p2p->op_channel = p2p->cfg->op_channel;
476 os_memcpy(&p2p->channels, &p2p->cfg->channels,
477 sizeof(struct p2p_channels));
480 if (p2p->state != P2P_IDLE)
483 p2p->inv_role = role;
484 p2p->inv_bssid_set = bssid != NULL;
486 os_memcpy(p2p->inv_bssid, bssid, ETH_ALEN);
487 os_memcpy(p2p->inv_ssid, ssid, ssid_len);
488 p2p->inv_ssid_len = ssid_len;
489 p2p->inv_persistent = persistent_group;
490 return p2p_invite_send(p2p, dev, go_dev_addr);