p2p_build.c revision 1f69aa52ea2e0a73ac502565df8c666ee49cab6a 
1/*
2 * P2P - IE builder
3 * Copyright (c) 2009-2010, 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 "wps/wps_i.h"
20#include "p2p_i.h"
21
22
23void p2p_buf_add_action_hdr(struct wpabuf *buf, u8 subtype, u8 dialog_token)
24{
25	wpabuf_put_u8(buf, WLAN_ACTION_VENDOR_SPECIFIC);
26	wpabuf_put_be24(buf, OUI_WFA);
27	wpabuf_put_u8(buf, P2P_OUI_TYPE);
28
29	wpabuf_put_u8(buf, subtype); /* OUI Subtype */
30	wpabuf_put_u8(buf, dialog_token);
31	wpa_printf(MSG_DEBUG, "P2P: * Dialog Token: %d", dialog_token);
32}
33
34
35void p2p_buf_add_public_action_hdr(struct wpabuf *buf, u8 subtype,
36				   u8 dialog_token)
37{
38	wpabuf_put_u8(buf, WLAN_ACTION_PUBLIC);
39	wpabuf_put_u8(buf, WLAN_PA_VENDOR_SPECIFIC);
40	wpabuf_put_be24(buf, OUI_WFA);
41	wpabuf_put_u8(buf, P2P_OUI_TYPE);
42
43	wpabuf_put_u8(buf, subtype); /* OUI Subtype */
44	wpabuf_put_u8(buf, dialog_token);
45	wpa_printf(MSG_DEBUG, "P2P: * Dialog Token: %d", dialog_token);
46}
47
48
49u8 * p2p_buf_add_ie_hdr(struct wpabuf *buf)
50{
51	u8 *len;
52
53	/* P2P IE header */
54	wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC);
55	len = wpabuf_put(buf, 1); /* IE length to be filled */
56	wpabuf_put_be24(buf, OUI_WFA);
57	wpabuf_put_u8(buf, P2P_OUI_TYPE);
58	wpa_printf(MSG_DEBUG, "P2P: * P2P IE header");
59	return len;
60}
61
62
63void p2p_buf_update_ie_hdr(struct wpabuf *buf, u8 *len)
64{
65	/* Update P2P IE Length */
66	*len = (u8 *) wpabuf_put(buf, 0) - len - 1;
67}
68
69
70void p2p_buf_add_capability(struct wpabuf *buf, u8 dev_capab, u8 group_capab)
71{
72	/* P2P Capability */
73	wpabuf_put_u8(buf, P2P_ATTR_CAPABILITY);
74	wpabuf_put_le16(buf, 2);
75	wpabuf_put_u8(buf, dev_capab); /* Device Capabilities */
76	wpabuf_put_u8(buf, group_capab); /* Group Capabilities */
77	wpa_printf(MSG_DEBUG, "P2P: * Capability dev=%02x group=%02x",
78		   dev_capab, group_capab);
79}
80
81
82void p2p_buf_add_go_intent(struct wpabuf *buf, u8 go_intent)
83{
84	/* Group Owner Intent */
85	wpabuf_put_u8(buf, P2P_ATTR_GROUP_OWNER_INTENT);
86	wpabuf_put_le16(buf, 1);
87	wpabuf_put_u8(buf, go_intent);
88	wpa_printf(MSG_DEBUG, "P2P: * GO Intent: Intent %u Tie breaker %u",
89		   go_intent >> 1, go_intent & 0x01);
90}
91
92
93void p2p_buf_add_listen_channel(struct wpabuf *buf, const char *country,
94				u8 reg_class, u8 channel)
95{
96	/* Listen Channel */
97	wpabuf_put_u8(buf, P2P_ATTR_LISTEN_CHANNEL);
98	wpabuf_put_le16(buf, 5);
99	wpabuf_put_data(buf, country, 3);
100	wpabuf_put_u8(buf, reg_class); /* Regulatory Class */
101	wpabuf_put_u8(buf, channel); /* Channel Number */
102	wpa_printf(MSG_DEBUG, "P2P: * Listen Channel: Regulatory Class %u "
103		   "Channel %u", reg_class, channel);
104}
105
106
107void p2p_buf_add_operating_channel(struct wpabuf *buf, const char *country,
108				   u8 reg_class, u8 channel)
109{
110	/* Operating Channel */
111	wpabuf_put_u8(buf, P2P_ATTR_OPERATING_CHANNEL);
112	wpabuf_put_le16(buf, 5);
113	wpabuf_put_data(buf, country, 3);
114	wpabuf_put_u8(buf, reg_class); /* Regulatory Class */
115	wpabuf_put_u8(buf, channel); /* Channel Number */
116	wpa_printf(MSG_DEBUG, "P2P: * Operating Channel: Regulatory Class %u "
117		   "Channel %u", reg_class, channel);
118}
119
120
121void p2p_buf_add_channel_list(struct wpabuf *buf, const char *country,
122			      struct p2p_channels *chan)
123{
124	u8 *len;
125	size_t i;
126
127	/* Channel List */
128	wpabuf_put_u8(buf, P2P_ATTR_CHANNEL_LIST);
129	len = wpabuf_put(buf, 2); /* IE length to be filled */
130	wpabuf_put_data(buf, country, 3); /* Country String */
131
132	for (i = 0; i < chan->reg_classes; i++) {
133		struct p2p_reg_class *c = &chan->reg_class[i];
134		wpabuf_put_u8(buf, c->reg_class);
135		wpabuf_put_u8(buf, c->channels);
136		wpabuf_put_data(buf, c->channel, c->channels);
137	}
138
139	/* Update attribute length */
140	WPA_PUT_LE16(len, (u8 *) wpabuf_put(buf, 0) - len - 2);
141	wpa_printf(MSG_DEBUG, "P2P: * Channel List");
142}
143
144
145void p2p_buf_add_status(struct wpabuf *buf, u8 status)
146{
147	/* Status */
148	wpabuf_put_u8(buf, P2P_ATTR_STATUS);
149	wpabuf_put_le16(buf, 1);
150	wpabuf_put_u8(buf, status);
151	wpa_printf(MSG_DEBUG, "P2P: * Status: %d", status);
152}
153
154
155void p2p_buf_add_device_info(struct wpabuf *buf, struct p2p_data *p2p,
156			     struct p2p_device *peer)
157{
158	u8 *len;
159	u16 methods;
160	size_t nlen, i;
161
162	/* P2P Device Info */
163	wpabuf_put_u8(buf, P2P_ATTR_DEVICE_INFO);
164	len = wpabuf_put(buf, 2); /* IE length to be filled */
165
166	/* P2P Device address */
167	wpabuf_put_data(buf, p2p->cfg->dev_addr, ETH_ALEN);
168
169	/* Config Methods */
170	methods = 0;
171	if (peer && peer->wps_method != WPS_NOT_READY) {
172		if (peer->wps_method == WPS_PBC)
173			methods |= WPS_CONFIG_PUSHBUTTON;
174		else if (peer->wps_method == WPS_PIN_DISPLAY ||
175			 peer->wps_method == WPS_PIN_KEYPAD)
176			methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
177	} else if (p2p->cfg->config_methods) {
178		methods |= p2p->cfg->config_methods &
179			(WPS_CONFIG_PUSHBUTTON | WPS_CONFIG_DISPLAY |
180			 WPS_CONFIG_KEYPAD);
181	} else {
182		methods |= WPS_CONFIG_PUSHBUTTON;
183		methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
184	}
185	wpabuf_put_be16(buf, methods);
186
187	/* Primary Device Type */
188	wpabuf_put_data(buf, p2p->cfg->pri_dev_type,
189			sizeof(p2p->cfg->pri_dev_type));
190
191	/* Number of Secondary Device Types */
192	wpabuf_put_u8(buf, p2p->cfg->num_sec_dev_types);
193
194	/* Secondary Device Type List */
195	for (i = 0; i < p2p->cfg->num_sec_dev_types; i++)
196		wpabuf_put_data(buf, p2p->cfg->sec_dev_type[i],
197				WPS_DEV_TYPE_LEN);
198
199	/* Device Name */
200	nlen = p2p->cfg->dev_name ? os_strlen(p2p->cfg->dev_name) : 0;
201	wpabuf_put_be16(buf, ATTR_DEV_NAME);
202	wpabuf_put_be16(buf, nlen);
203	wpabuf_put_data(buf, p2p->cfg->dev_name, nlen);
204
205	/* Update attribute length */
206	WPA_PUT_LE16(len, (u8 *) wpabuf_put(buf, 0) - len - 2);
207	wpa_printf(MSG_DEBUG, "P2P: * Device Info");
208}
209
210
211void p2p_buf_add_device_id(struct wpabuf *buf, const u8 *dev_addr)
212{
213	/* P2P Device ID */
214	wpabuf_put_u8(buf, P2P_ATTR_DEVICE_ID);
215	wpabuf_put_le16(buf, ETH_ALEN);
216	wpabuf_put_data(buf, dev_addr, ETH_ALEN);
217	wpa_printf(MSG_DEBUG, "P2P: * Device ID: " MACSTR, MAC2STR(dev_addr));
218}
219
220
221void p2p_buf_add_config_timeout(struct wpabuf *buf, u8 go_timeout,
222				u8 client_timeout)
223{
224	/* Configuration Timeout */
225	wpabuf_put_u8(buf, P2P_ATTR_CONFIGURATION_TIMEOUT);
226	wpabuf_put_le16(buf, 2);
227	wpabuf_put_u8(buf, go_timeout);
228	wpabuf_put_u8(buf, client_timeout);
229	wpa_printf(MSG_DEBUG, "P2P: * Configuration Timeout: GO %d (*10ms)  "
230		   "client %d (*10ms)", go_timeout, client_timeout);
231}
232
233
234void p2p_buf_add_intended_addr(struct wpabuf *buf, const u8 *interface_addr)
235{
236	/* Intended P2P Interface Address */
237	wpabuf_put_u8(buf, P2P_ATTR_INTENDED_INTERFACE_ADDR);
238	wpabuf_put_le16(buf, ETH_ALEN);
239	wpabuf_put_data(buf, interface_addr, ETH_ALEN);
240	wpa_printf(MSG_DEBUG, "P2P: * Intended P2P Interface Address " MACSTR,
241		   MAC2STR(interface_addr));
242}
243
244
245void p2p_buf_add_group_bssid(struct wpabuf *buf, const u8 *bssid)
246{
247	/* P2P Group BSSID */
248	wpabuf_put_u8(buf, P2P_ATTR_GROUP_BSSID);
249	wpabuf_put_le16(buf, ETH_ALEN);
250	wpabuf_put_data(buf, bssid, ETH_ALEN);
251	wpa_printf(MSG_DEBUG, "P2P: * P2P Group BSSID " MACSTR,
252		   MAC2STR(bssid));
253}
254
255
256void p2p_buf_add_group_id(struct wpabuf *buf, const u8 *dev_addr,
257			  const u8 *ssid, size_t ssid_len)
258{
259	/* P2P Group ID */
260	wpabuf_put_u8(buf, P2P_ATTR_GROUP_ID);
261	wpabuf_put_le16(buf, ETH_ALEN + ssid_len);
262	wpabuf_put_data(buf, dev_addr, ETH_ALEN);
263	wpabuf_put_data(buf, ssid, ssid_len);
264	wpa_printf(MSG_DEBUG, "P2P: * P2P Group ID " MACSTR,
265		   MAC2STR(dev_addr));
266}
267
268
269void p2p_buf_add_invitation_flags(struct wpabuf *buf, u8 flags)
270{
271	/* Invitation Flags */
272	wpabuf_put_u8(buf, P2P_ATTR_INVITATION_FLAGS);
273	wpabuf_put_le16(buf, 1);
274	wpabuf_put_u8(buf, flags);
275	wpa_printf(MSG_DEBUG, "P2P: * Invitation Flags: bitmap 0x%x", flags);
276}
277
278
279static void p2p_buf_add_noa_desc(struct wpabuf *buf, struct p2p_noa_desc *desc)
280{
281	if (desc == NULL)
282		return;
283
284	wpabuf_put_u8(buf, desc->count_type);
285	wpabuf_put_le32(buf, desc->duration);
286	wpabuf_put_le32(buf, desc->interval);
287	wpabuf_put_le32(buf, desc->start_time);
288}
289
290
291void p2p_buf_add_noa(struct wpabuf *buf, u8 noa_index, u8 opp_ps, u8 ctwindow,
292		     struct p2p_noa_desc *desc1, struct p2p_noa_desc *desc2)
293{
294	/* Notice of Absence */
295	wpabuf_put_u8(buf, P2P_ATTR_NOTICE_OF_ABSENCE);
296	wpabuf_put_le16(buf, 2 + (desc1 ? 13 : 0) + (desc2 ? 13 : 0));
297	wpabuf_put_u8(buf, noa_index);
298	wpabuf_put_u8(buf, (opp_ps ? 0x80 : 0) | (ctwindow & 0x7f));
299	p2p_buf_add_noa_desc(buf, desc1);
300	p2p_buf_add_noa_desc(buf, desc2);
301	wpa_printf(MSG_DEBUG, "P2P: * Notice of Absence");
302}
303
304
305void p2p_buf_add_ext_listen_timing(struct wpabuf *buf, u16 period,
306				   u16 interval)
307{
308	/* Extended Listen Timing */
309	wpabuf_put_u8(buf, P2P_ATTR_EXT_LISTEN_TIMING);
310	wpabuf_put_le16(buf, 4);
311	wpabuf_put_le16(buf, period);
312	wpabuf_put_le16(buf, interval);
313	wpa_printf(MSG_DEBUG, "P2P: * Extended Listen Timing (period %u msec  "
314		   "interval %u msec)", period, interval);
315}
316
317
318void p2p_buf_add_p2p_interface(struct wpabuf *buf, struct p2p_data *p2p)
319{
320	/* P2P Interface */
321	wpabuf_put_u8(buf, P2P_ATTR_INTERFACE);
322	wpabuf_put_le16(buf, ETH_ALEN + 1 + ETH_ALEN);
323	/* P2P Device address */
324	wpabuf_put_data(buf, p2p->cfg->dev_addr, ETH_ALEN);
325	/*
326	 * FIX: Fetch interface address list from driver. Do not include
327	 * the P2P Device address if it is never used as interface address.
328	 */
329	/* P2P Interface Address Count */
330	wpabuf_put_u8(buf, 1);
331	wpabuf_put_data(buf, p2p->cfg->dev_addr, ETH_ALEN);
332}
333
334
335static void p2p_add_wps_string(struct wpabuf *buf, enum wps_attribute attr,
336			       const char *val)
337{
338	size_t len;
339
340	wpabuf_put_be16(buf, attr);
341	len = val ? os_strlen(val) : 0;
342#ifndef CONFIG_WPS_STRICT
343	if (len == 0) {
344		/*
345		 * Some deployed WPS implementations fail to parse zeor-length
346		 * attributes. As a workaround, send a space character if the
347		 * device attribute string is empty.
348		 */
349		wpabuf_put_be16(buf, 1);
350		wpabuf_put_u8(buf, ' ');
351		return;
352	}
353#endif /* CONFIG_WPS_STRICT */
354	wpabuf_put_be16(buf, len);
355	if (val)
356		wpabuf_put_data(buf, val, len);
357}
358
359
360void p2p_build_wps_ie(struct p2p_data *p2p, struct wpabuf *buf, u16 pw_id,
361		      int all_attr)
362{
363	u8 *len;
364	int i;
365
366	wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC);
367	len = wpabuf_put(buf, 1);
368	wpabuf_put_be32(buf, WPS_DEV_OUI_WFA);
369
370	wps_build_version(buf);
371
372	if (all_attr) {
373		wpabuf_put_be16(buf, ATTR_WPS_STATE);
374		wpabuf_put_be16(buf, 1);
375		wpabuf_put_u8(buf, WPS_STATE_NOT_CONFIGURED);
376	}
377
378	/* Device Password ID */
379	wpabuf_put_be16(buf, ATTR_DEV_PASSWORD_ID);
380	wpabuf_put_be16(buf, 2);
381	wpa_printf(MSG_DEBUG, "P2P: WPS IE Device Password ID: %d", pw_id);
382	wpabuf_put_be16(buf, pw_id);
383
384	if (all_attr) {
385		wpabuf_put_be16(buf, ATTR_RESPONSE_TYPE);
386		wpabuf_put_be16(buf, 1);
387		wpabuf_put_u8(buf, WPS_RESP_ENROLLEE_INFO);
388
389		wps_build_uuid_e(buf, p2p->cfg->uuid);
390		p2p_add_wps_string(buf, ATTR_MANUFACTURER,
391				   p2p->cfg->manufacturer);
392		p2p_add_wps_string(buf, ATTR_MODEL_NAME, p2p->cfg->model_name);
393		p2p_add_wps_string(buf, ATTR_MODEL_NUMBER,
394				   p2p->cfg->model_number);
395		p2p_add_wps_string(buf, ATTR_SERIAL_NUMBER,
396				   p2p->cfg->serial_number);
397
398		wpabuf_put_be16(buf, ATTR_PRIMARY_DEV_TYPE);
399		wpabuf_put_be16(buf, WPS_DEV_TYPE_LEN);
400		wpabuf_put_data(buf, p2p->cfg->pri_dev_type, WPS_DEV_TYPE_LEN);
401
402		p2p_add_wps_string(buf, ATTR_DEV_NAME, p2p->cfg->dev_name);
403
404		wpabuf_put_be16(buf, ATTR_CONFIG_METHODS);
405		wpabuf_put_be16(buf, 2);
406		wpabuf_put_be16(buf, p2p->cfg->config_methods);
407	}
408
409	wps_build_wfa_ext(buf, 0, NULL, 0);
410
411	if (all_attr && p2p->cfg->num_sec_dev_types) {
412		wpabuf_put_be16(buf, ATTR_SECONDARY_DEV_TYPE_LIST);
413		wpabuf_put_be16(buf, WPS_DEV_TYPE_LEN *
414				p2p->cfg->num_sec_dev_types);
415		wpabuf_put_data(buf, p2p->cfg->sec_dev_type,
416				WPS_DEV_TYPE_LEN *
417				p2p->cfg->num_sec_dev_types);
418	}
419
420	/* Add the WPS vendor extensions */
421	for (i = 0; i < P2P_MAX_WPS_VENDOR_EXT; i++) {
422		if (p2p->wps_vendor_ext[i] == NULL)
423			break;
424		if (wpabuf_tailroom(buf) <
425		    4 + wpabuf_len(p2p->wps_vendor_ext[i]))
426			continue;
427		wpabuf_put_be16(buf, ATTR_VENDOR_EXT);
428		wpabuf_put_be16(buf, wpabuf_len(p2p->wps_vendor_ext[i]));
429		wpabuf_put_buf(buf, p2p->wps_vendor_ext[i]);
430	}
431
432	p2p_buf_update_ie_hdr(buf, len);
433}
434