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
)
43 p2p_buf_add_config_timeout(buf
, 0, 0);
45 p2p_buf_add_config_timeout(buf
, 100, 20);
46 p2p_buf_add_operating_channel(buf
, p2p
->cfg
->country
,
47 p2p
->op_reg_class
, p2p
->op_channel
);
48 if (p2p
->inv_bssid_set
)
49 p2p_buf_add_group_bssid(buf
, p2p
->inv_bssid
);
50 p2p_buf_add_channel_list(buf
, p2p
->cfg
->country
, &p2p
->channels
);
52 dev_addr
= go_dev_addr
;
53 else if (p2p
->inv_role
== P2P_INVITE_ROLE_CLIENT
)
54 dev_addr
= peer
->p2p_device_addr
;
56 dev_addr
= p2p
->cfg
->dev_addr
;
57 p2p_buf_add_group_id(buf
, dev_addr
, p2p
->inv_ssid
, p2p
->inv_ssid_len
);
58 p2p_buf_add_invitation_flags(buf
, p2p
->inv_persistent
?
59 P2P_INVITATION_FLAGS_TYPE
: 0);
60 p2p_buf_update_ie_hdr(buf
, len
);
66 static struct wpabuf
* p2p_build_invitation_resp(struct p2p_data
*p2p
,
67 struct p2p_device
*peer
,
68 u8 dialog_token
, u8 status
,
69 const u8
*group_bssid
,
70 u8 reg_class
, u8 channel
,
71 struct p2p_channels
*channels
)
76 buf
= wpabuf_alloc(1000);
80 p2p_buf_add_public_action_hdr(buf
, P2P_INVITATION_RESP
,
83 len
= p2p_buf_add_ie_hdr(buf
);
84 p2p_buf_add_status(buf
, status
);
85 p2p_buf_add_config_timeout(buf
, 0, 0); /* FIX */
86 if (reg_class
&& channel
)
87 p2p_buf_add_operating_channel(buf
, p2p
->cfg
->country
,
90 p2p_buf_add_group_bssid(buf
, group_bssid
);
92 p2p_buf_add_channel_list(buf
, p2p
->cfg
->country
, channels
);
93 p2p_buf_update_ie_hdr(buf
, len
);
99 void p2p_process_invitation_req(struct p2p_data
*p2p
, const u8
*sa
,
100 const u8
*data
, size_t len
, int rx_freq
)
102 struct p2p_device
*dev
;
103 struct p2p_message msg
;
104 struct wpabuf
*resp
= NULL
;
105 u8 status
= P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE
;
108 u8 group_bssid
[ETH_ALEN
], *bssid
;
110 u8 reg_class
= 0, channel
= 0;
111 struct p2p_channels intersection
, *channels
= NULL
;
114 os_memset(group_bssid
, 0, sizeof(group_bssid
));
116 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
117 "P2P: Received Invitation Request from " MACSTR
" (freq=%d)",
118 MAC2STR(sa
), rx_freq
);
120 if (p2p_parse(data
, len
, &msg
))
123 dev
= p2p_get_device(p2p
, sa
);
125 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
126 "P2P: Reject Invitation Request from unknown peer "
127 MACSTR
, MAC2STR(sa
));
128 status
= P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE
;
132 if (!msg
.group_id
|| !msg
.channel_list
) {
133 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
134 "P2P: Mandatory attribute missing in Invitation "
135 "Request from " MACSTR
, MAC2STR(sa
));
136 status
= P2P_SC_FAIL_INVALID_PARAMS
;
140 if (msg
.invitation_flags
)
141 persistent
= *msg
.invitation_flags
& P2P_INVITATION_FLAGS_TYPE
;
143 /* Invitation Flags is a mandatory attribute starting from P2P
144 * spec 1.06. As a backwards compatibility mechanism, assume
145 * the request was for a persistent group if the attribute is
148 wpa_printf(MSG_DEBUG
, "P2P: Mandatory Invitation Flags "
149 "attribute missing from Invitation Request");
153 if (p2p_peer_channels_check(p2p
, &p2p
->cfg
->channels
, dev
,
154 msg
.channel_list
, msg
.channel_list_len
) <
156 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
157 "P2P: No common channels found");
158 status
= P2P_SC_FAIL_NO_COMMON_CHANNELS
;
162 if (p2p
->cfg
->invitation_process
) {
163 status
= p2p
->cfg
->invitation_process(
164 p2p
->cfg
->cb_ctx
, sa
, msg
.group_bssid
, msg
.group_id
,
165 msg
.group_id
+ ETH_ALEN
, msg
.group_id_len
- ETH_ALEN
,
166 &go
, group_bssid
, &op_freq
, persistent
);
170 if (p2p_freq_to_channel(p2p
->cfg
->country
, op_freq
,
171 ®_class
, &channel
) < 0) {
172 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
173 "P2P: Unknown forced freq %d MHz from "
174 "invitation_process()", op_freq
);
175 status
= P2P_SC_FAIL_NO_COMMON_CHANNELS
;
179 p2p_channels_intersect(&p2p
->cfg
->channels
, &dev
->channels
,
181 if (!p2p_channels_includes(&intersection
, reg_class
, channel
))
183 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
184 "P2P: forced freq %d MHz not in the supported "
185 "channels interaction", op_freq
);
186 status
= P2P_SC_FAIL_NO_COMMON_CHANNELS
;
190 if (status
== P2P_SC_SUCCESS
)
191 channels
= &intersection
;
193 op_freq
= p2p_channel_to_freq(p2p
->cfg
->country
,
194 p2p
->cfg
->op_reg_class
,
195 p2p
->cfg
->op_channel
);
197 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
198 "P2P: Unknown operational channel "
199 "(country=%c%c reg_class=%u channel=%u)",
200 p2p
->cfg
->country
[0], p2p
->cfg
->country
[1],
201 p2p
->cfg
->op_reg_class
, p2p
->cfg
->op_channel
);
202 status
= P2P_SC_FAIL_NO_COMMON_CHANNELS
;
206 p2p_channels_intersect(&p2p
->cfg
->channels
, &dev
->channels
,
208 if (status
== P2P_SC_SUCCESS
) {
209 reg_class
= p2p
->cfg
->op_reg_class
;
210 channel
= p2p
->cfg
->op_channel
;
211 channels
= &intersection
;
216 if (go
&& status
== P2P_SC_SUCCESS
&& !is_zero_ether_addr(group_bssid
))
220 resp
= p2p_build_invitation_resp(p2p
, dev
, msg
.dialog_token
, status
,
221 bssid
, reg_class
, channel
, channels
);
229 freq
= p2p_channel_to_freq(p2p
->cfg
->country
,
233 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
234 "P2P: Unknown regulatory class/channel");
239 * Store copy of invitation data to be used when processing TX status
240 * callback for the Acton frame.
242 os_memcpy(p2p
->inv_sa
, sa
, ETH_ALEN
);
243 if (msg
.group_bssid
) {
244 os_memcpy(p2p
->inv_group_bssid
, msg
.group_bssid
, ETH_ALEN
);
245 p2p
->inv_group_bssid_ptr
= p2p
->inv_group_bssid
;
247 p2p
->inv_group_bssid_ptr
= NULL
;
248 if (msg
.group_id_len
- ETH_ALEN
<= 32) {
249 os_memcpy(p2p
->inv_ssid
, msg
.group_id
+ ETH_ALEN
,
250 msg
.group_id_len
- ETH_ALEN
);
251 p2p
->inv_ssid_len
= msg
.group_id_len
- ETH_ALEN
;
253 os_memcpy(p2p
->inv_go_dev_addr
, msg
.group_id
, ETH_ALEN
);
254 p2p
->inv_status
= status
;
255 p2p
->inv_op_freq
= op_freq
;
257 p2p
->pending_action_state
= P2P_PENDING_INVITATION_RESPONSE
;
258 if (p2p
->cfg
->send_action(p2p
->cfg
->cb_ctx
, freq
, sa
,
259 p2p
->cfg
->dev_addr
, p2p
->cfg
->dev_addr
,
260 wpabuf_head(resp
), wpabuf_len(resp
), 200) <
262 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
263 "P2P: Failed to send Action frame");
268 p2p_parse_free(&msg
);
272 void p2p_process_invitation_resp(struct p2p_data
*p2p
, const u8
*sa
,
273 const u8
*data
, size_t len
)
275 struct p2p_device
*dev
;
276 struct p2p_message msg
;
278 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
279 "P2P: Received Invitation Response from " MACSTR
,
282 dev
= p2p_get_device(p2p
, sa
);
284 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
285 "P2P: Ignore Invitation Response from unknown peer "
286 MACSTR
, MAC2STR(sa
));
290 if (dev
!= p2p
->invite_peer
) {
291 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
292 "P2P: Ignore unexpected Invitation Response from peer "
293 MACSTR
, MAC2STR(sa
));
297 if (p2p_parse(data
, len
, &msg
))
301 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
302 "P2P: Mandatory Status attribute missing in "
303 "Invitation Response from " MACSTR
, MAC2STR(sa
));
304 p2p_parse_free(&msg
);
308 if (p2p
->cfg
->invitation_result
)
309 p2p
->cfg
->invitation_result(p2p
->cfg
->cb_ctx
, *msg
.status
,
312 p2p_parse_free(&msg
);
314 p2p_clear_timeout(p2p
);
315 p2p_set_state(p2p
, P2P_IDLE
);
316 p2p
->invite_peer
= NULL
;
320 int p2p_invite_send(struct p2p_data
*p2p
, struct p2p_device
*dev
,
321 const u8
*go_dev_addr
)
326 freq
= dev
->listen_freq
> 0 ? dev
->listen_freq
: dev
->oper_freq
;
328 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
329 "P2P: No Listen/Operating frequency known for the "
330 "peer " MACSTR
" to send Invitation Request",
331 MAC2STR(dev
->p2p_device_addr
));
335 req
= p2p_build_invitation_req(p2p
, dev
, go_dev_addr
);
338 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
339 "P2P: Sending Invitation Request");
340 p2p_set_state(p2p
, P2P_INVITE
);
341 p2p
->pending_action_state
= P2P_PENDING_INVITATION_REQUEST
;
342 p2p
->invite_peer
= dev
;
343 dev
->invitation_reqs
++;
344 if (p2p
->cfg
->send_action(p2p
->cfg
->cb_ctx
, freq
,
345 dev
->p2p_device_addr
, p2p
->cfg
->dev_addr
,
346 dev
->p2p_device_addr
,
347 wpabuf_head(req
), wpabuf_len(req
), 200) < 0)
349 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
350 "P2P: Failed to send Action frame");
351 /* Use P2P find to recover and retry */
352 p2p_set_timeout(p2p
, 0, 0);
361 void p2p_invitation_req_cb(struct p2p_data
*p2p
, int success
)
363 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
364 "P2P: Invitation Request TX callback: success=%d", success
);
366 if (p2p
->invite_peer
== NULL
) {
367 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
368 "P2P: No pending Invite");
373 * Use P2P find, if needed, to find the other device from its listen
376 p2p_set_state(p2p
, P2P_INVITE
);
377 p2p_set_timeout(p2p
, 0, 100000);
381 void p2p_invitation_resp_cb(struct p2p_data
*p2p
, int success
)
383 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
384 "P2P: Invitation Response TX callback: success=%d", success
);
385 p2p
->cfg
->send_action_done(p2p
->cfg
->cb_ctx
);
387 if (success
&& p2p
->cfg
->invitation_received
) {
388 p2p
->cfg
->invitation_received(p2p
->cfg
->cb_ctx
,
390 p2p
->inv_group_bssid
,
391 p2p
->inv_ssid
, p2p
->inv_ssid_len
,
392 p2p
->inv_go_dev_addr
,
399 int p2p_invite(struct p2p_data
*p2p
, const u8
*peer
, enum p2p_invite_role role
,
400 const u8
*bssid
, const u8
*ssid
, size_t ssid_len
,
401 unsigned int force_freq
, const u8
*go_dev_addr
,
402 int persistent_group
)
404 struct p2p_device
*dev
;
406 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
407 "P2P: Request to invite peer " MACSTR
" role=%d",
408 MAC2STR(peer
), role
);
410 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
411 "P2P: Invitation for BSSID " MACSTR
, MAC2STR(bssid
));
413 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
414 "P2P: Invitation for GO Device Address " MACSTR
,
415 MAC2STR(go_dev_addr
));
416 os_memcpy(p2p
->invite_go_dev_addr_buf
, go_dev_addr
, ETH_ALEN
);
417 p2p
->invite_go_dev_addr
= p2p
->invite_go_dev_addr_buf
;
419 p2p
->invite_go_dev_addr
= NULL
;
420 wpa_hexdump_ascii(MSG_DEBUG
, "P2P: Invitation for SSID",
423 dev
= p2p_get_device(p2p
, peer
);
424 if (dev
== NULL
|| (dev
->listen_freq
<= 0 && dev
->oper_freq
<= 0)) {
425 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
426 "P2P: Cannot invite unknown P2P Device " MACSTR
,
431 if (dev
->flags
& P2P_DEV_GROUP_CLIENT_ONLY
) {
432 if (!(dev
->dev_capab
& P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY
)) {
433 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
434 "P2P: Cannot invite a P2P Device " MACSTR
435 " that is in a group and is not discoverable",
438 /* TODO: use device discoverability request through GO */
441 dev
->invitation_reqs
= 0;
444 if (p2p_freq_to_channel(p2p
->cfg
->country
, force_freq
,
445 &p2p
->op_reg_class
, &p2p
->op_channel
) <
447 wpa_msg(p2p
->cfg
->msg_ctx
, MSG_DEBUG
,
448 "P2P: Unsupported frequency %u MHz",
452 p2p
->channels
.reg_classes
= 1;
453 p2p
->channels
.reg_class
[0].channels
= 1;
454 p2p
->channels
.reg_class
[0].reg_class
= p2p
->op_reg_class
;
455 p2p
->channels
.reg_class
[0].channel
[0] = p2p
->op_channel
;
457 p2p
->op_reg_class
= p2p
->cfg
->op_reg_class
;
458 p2p
->op_channel
= p2p
->cfg
->op_channel
;
459 os_memcpy(&p2p
->channels
, &p2p
->cfg
->channels
,
460 sizeof(struct p2p_channels
));
463 if (p2p
->state
!= P2P_IDLE
)
466 p2p
->inv_role
= role
;
467 p2p
->inv_bssid_set
= bssid
!= NULL
;
469 os_memcpy(p2p
->inv_bssid
, bssid
, ETH_ALEN
);
470 os_memcpy(p2p
->inv_ssid
, ssid
, ssid_len
);
471 p2p
->inv_ssid_len
= ssid_len
;
472 p2p
->inv_persistent
= persistent_group
;
473 return p2p_invite_send(p2p
, dev
, go_dev_addr
);