p2p_build.c revision 252726 
1/*
2 * P2P - IE builder
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 "wps/wps_i.h"
14#include "p2p_i.h"
15
16
17void p2p_buf_add_action_hdr(struct wpabuf *buf, u8 subtype, u8 dialog_token)
18{
19	wpabuf_put_u8(buf, WLAN_ACTION_VENDOR_SPECIFIC);
20	wpabuf_put_be24(buf, OUI_WFA);
21	wpabuf_put_u8(buf, P2P_OUI_TYPE);
22
23	wpabuf_put_u8(buf, subtype); /* OUI Subtype */
24	wpabuf_put_u8(buf, dialog_token);
25	wpa_printf(MSG_DEBUG, "P2P: * Dialog Token: %d", dialog_token);
26}
27
28
29void p2p_buf_add_public_action_hdr(struct wpabuf *buf, u8 subtype,
30				   u8 dialog_token)
31{
32	wpabuf_put_u8(buf, WLAN_ACTION_PUBLIC);
33	wpabuf_put_u8(buf, WLAN_PA_VENDOR_SPECIFIC);
34	wpabuf_put_be24(buf, OUI_WFA);
35	wpabuf_put_u8(buf, P2P_OUI_TYPE);
36
37	wpabuf_put_u8(buf, subtype); /* OUI Subtype */
38	wpabuf_put_u8(buf, dialog_token);
39	wpa_printf(MSG_DEBUG, "P2P: * Dialog Token: %d", dialog_token);
40}
41
42
43u8 * p2p_buf_add_ie_hdr(struct wpabuf *buf)
44{
45	u8 *len;
46
47	/* P2P IE header */
48	wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC);
49	len = wpabuf_put(buf, 1); /* IE length to be filled */
50	wpabuf_put_be24(buf, OUI_WFA);
51	wpabuf_put_u8(buf, P2P_OUI_TYPE);
52	wpa_printf(MSG_DEBUG, "P2P: * P2P IE header");
53	return len;
54}
55
56
57void p2p_buf_update_ie_hdr(struct wpabuf *buf, u8 *len)
58{
59	/* Update P2P IE Length */
60	*len = (u8 *) wpabuf_put(buf, 0) - len - 1;
61}
62
63
64void p2p_buf_add_capability(struct wpabuf *buf, u8 dev_capab, u8 group_capab)
65{
66	/* P2P Capability */
67	wpabuf_put_u8(buf, P2P_ATTR_CAPABILITY);
68	wpabuf_put_le16(buf, 2);
69	wpabuf_put_u8(buf, dev_capab); /* Device Capabilities */
70	wpabuf_put_u8(buf, group_capab); /* Group Capabilities */
71	wpa_printf(MSG_DEBUG, "P2P: * Capability dev=%02x group=%02x",
72		   dev_capab, group_capab);
73}
74
75
76void p2p_buf_add_go_intent(struct wpabuf *buf, u8 go_intent)
77{
78	/* Group Owner Intent */
79	wpabuf_put_u8(buf, P2P_ATTR_GROUP_OWNER_INTENT);
80	wpabuf_put_le16(buf, 1);
81	wpabuf_put_u8(buf, go_intent);
82	wpa_printf(MSG_DEBUG, "P2P: * GO Intent: Intent %u Tie breaker %u",
83		   go_intent >> 1, go_intent & 0x01);
84}
85
86
87void p2p_buf_add_listen_channel(struct wpabuf *buf, const char *country,
88				u8 reg_class, u8 channel)
89{
90	/* Listen Channel */
91	wpabuf_put_u8(buf, P2P_ATTR_LISTEN_CHANNEL);
92	wpabuf_put_le16(buf, 5);
93	wpabuf_put_data(buf, country, 3);
94	wpabuf_put_u8(buf, reg_class); /* Regulatory Class */
95	wpabuf_put_u8(buf, channel); /* Channel Number */
96	wpa_printf(MSG_DEBUG, "P2P: * Listen Channel: Regulatory Class %u "
97		   "Channel %u", reg_class, channel);
98}
99
100
101void p2p_buf_add_operating_channel(struct wpabuf *buf, const char *country,
102				   u8 reg_class, u8 channel)
103{
104	/* Operating Channel */
105	wpabuf_put_u8(buf, P2P_ATTR_OPERATING_CHANNEL);
106	wpabuf_put_le16(buf, 5);
107	wpabuf_put_data(buf, country, 3);
108	wpabuf_put_u8(buf, reg_class); /* Regulatory Class */
109	wpabuf_put_u8(buf, channel); /* Channel Number */
110	wpa_printf(MSG_DEBUG, "P2P: * Operating Channel: Regulatory Class %u "
111		   "Channel %u", reg_class, channel);
112}
113
114
115void p2p_buf_add_channel_list(struct wpabuf *buf, const char *country,
116			      struct p2p_channels *chan)
117{
118	u8 *len;
119	size_t i;
120
121	/* Channel List */
122	wpabuf_put_u8(buf, P2P_ATTR_CHANNEL_LIST);
123	len = wpabuf_put(buf, 2); /* IE length to be filled */
124	wpabuf_put_data(buf, country, 3); /* Country String */
125
126	for (i = 0; i < chan->reg_classes; i++) {
127		struct p2p_reg_class *c = &chan->reg_class[i];
128		wpabuf_put_u8(buf, c->reg_class);
129		wpabuf_put_u8(buf, c->channels);
130		wpabuf_put_data(buf, c->channel, c->channels);
131	}
132
133	/* Update attribute length */
134	WPA_PUT_LE16(len, (u8 *) wpabuf_put(buf, 0) - len - 2);
135	wpa_hexdump(MSG_DEBUG, "P2P: * Channel List",
136		    len + 2, (u8 *) wpabuf_put(buf, 0) - len - 2);
137}
138
139
140void p2p_buf_add_status(struct wpabuf *buf, u8 status)
141{
142	/* Status */
143	wpabuf_put_u8(buf, P2P_ATTR_STATUS);
144	wpabuf_put_le16(buf, 1);
145	wpabuf_put_u8(buf, status);
146	wpa_printf(MSG_DEBUG, "P2P: * Status: %d", status);
147}
148
149
150void p2p_buf_add_device_info(struct wpabuf *buf, struct p2p_data *p2p,
151			     struct p2p_device *peer)
152{
153	u8 *len;
154	u16 methods;
155	size_t nlen, i;
156
157	/* P2P Device Info */
158	wpabuf_put_u8(buf, P2P_ATTR_DEVICE_INFO);
159	len = wpabuf_put(buf, 2); /* IE length to be filled */
160
161	/* P2P Device address */
162	wpabuf_put_data(buf, p2p->cfg->dev_addr, ETH_ALEN);
163
164	/* Config Methods */
165	methods = 0;
166	if (peer && peer->wps_method != WPS_NOT_READY) {
167		if (peer->wps_method == WPS_PBC)
168			methods |= WPS_CONFIG_PUSHBUTTON;
169		else if (peer->wps_method == WPS_PIN_DISPLAY ||
170			 peer->wps_method == WPS_PIN_KEYPAD)
171			methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
172	} else if (p2p->cfg->config_methods) {
173		methods |= p2p->cfg->config_methods &
174			(WPS_CONFIG_PUSHBUTTON | WPS_CONFIG_DISPLAY |
175			 WPS_CONFIG_KEYPAD);
176	} else {
177		methods |= WPS_CONFIG_PUSHBUTTON;
178		methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
179	}
180	wpabuf_put_be16(buf, methods);
181
182	/* Primary Device Type */
183	wpabuf_put_data(buf, p2p->cfg->pri_dev_type,
184			sizeof(p2p->cfg->pri_dev_type));
185
186	/* Number of Secondary Device Types */
187	wpabuf_put_u8(buf, p2p->cfg->num_sec_dev_types);
188
189	/* Secondary Device Type List */
190	for (i = 0; i < p2p->cfg->num_sec_dev_types; i++)
191		wpabuf_put_data(buf, p2p->cfg->sec_dev_type[i],
192				WPS_DEV_TYPE_LEN);
193
194	/* Device Name */
195	nlen = p2p->cfg->dev_name ? os_strlen(p2p->cfg->dev_name) : 0;
196	wpabuf_put_be16(buf, ATTR_DEV_NAME);
197	wpabuf_put_be16(buf, nlen);
198	wpabuf_put_data(buf, p2p->cfg->dev_name, nlen);
199
200	/* Update attribute length */
201	WPA_PUT_LE16(len, (u8 *) wpabuf_put(buf, 0) - len - 2);
202	wpa_printf(MSG_DEBUG, "P2P: * Device Info");
203}
204
205
206void p2p_buf_add_device_id(struct wpabuf *buf, const u8 *dev_addr)
207{
208	/* P2P Device ID */
209	wpabuf_put_u8(buf, P2P_ATTR_DEVICE_ID);
210	wpabuf_put_le16(buf, ETH_ALEN);
211	wpabuf_put_data(buf, dev_addr, ETH_ALEN);
212	wpa_printf(MSG_DEBUG, "P2P: * Device ID: " MACSTR, MAC2STR(dev_addr));
213}
214
215
216void p2p_buf_add_config_timeout(struct wpabuf *buf, u8 go_timeout,
217				u8 client_timeout)
218{
219	/* Configuration Timeout */
220	wpabuf_put_u8(buf, P2P_ATTR_CONFIGURATION_TIMEOUT);
221	wpabuf_put_le16(buf, 2);
222	wpabuf_put_u8(buf, go_timeout);
223	wpabuf_put_u8(buf, client_timeout);
224	wpa_printf(MSG_DEBUG, "P2P: * Configuration Timeout: GO %d (*10ms)  "
225		   "client %d (*10ms)", go_timeout, client_timeout);
226}
227
228
229void p2p_buf_add_intended_addr(struct wpabuf *buf, const u8 *interface_addr)
230{
231	/* Intended P2P Interface Address */
232	wpabuf_put_u8(buf, P2P_ATTR_INTENDED_INTERFACE_ADDR);
233	wpabuf_put_le16(buf, ETH_ALEN);
234	wpabuf_put_data(buf, interface_addr, ETH_ALEN);
235	wpa_printf(MSG_DEBUG, "P2P: * Intended P2P Interface Address " MACSTR,
236		   MAC2STR(interface_addr));
237}
238
239
240void p2p_buf_add_group_bssid(struct wpabuf *buf, const u8 *bssid)
241{
242	/* P2P Group BSSID */
243	wpabuf_put_u8(buf, P2P_ATTR_GROUP_BSSID);
244	wpabuf_put_le16(buf, ETH_ALEN);
245	wpabuf_put_data(buf, bssid, ETH_ALEN);
246	wpa_printf(MSG_DEBUG, "P2P: * P2P Group BSSID " MACSTR,
247		   MAC2STR(bssid));
248}
249
250
251void p2p_buf_add_group_id(struct wpabuf *buf, const u8 *dev_addr,
252			  const u8 *ssid, size_t ssid_len)
253{
254	/* P2P Group ID */
255	wpabuf_put_u8(buf, P2P_ATTR_GROUP_ID);
256	wpabuf_put_le16(buf, ETH_ALEN + ssid_len);
257	wpabuf_put_data(buf, dev_addr, ETH_ALEN);
258	wpabuf_put_data(buf, ssid, ssid_len);
259	wpa_printf(MSG_DEBUG, "P2P: * P2P Group ID " MACSTR,
260		   MAC2STR(dev_addr));
261}
262
263
264void p2p_buf_add_invitation_flags(struct wpabuf *buf, u8 flags)
265{
266	/* Invitation Flags */
267	wpabuf_put_u8(buf, P2P_ATTR_INVITATION_FLAGS);
268	wpabuf_put_le16(buf, 1);
269	wpabuf_put_u8(buf, flags);
270	wpa_printf(MSG_DEBUG, "P2P: * Invitation Flags: bitmap 0x%x", flags);
271}
272
273
274static void p2p_buf_add_noa_desc(struct wpabuf *buf, struct p2p_noa_desc *desc)
275{
276	if (desc == NULL)
277		return;
278
279	wpabuf_put_u8(buf, desc->count_type);
280	wpabuf_put_le32(buf, desc->duration);
281	wpabuf_put_le32(buf, desc->interval);
282	wpabuf_put_le32(buf, desc->start_time);
283}
284
285
286void p2p_buf_add_noa(struct wpabuf *buf, u8 noa_index, u8 opp_ps, u8 ctwindow,
287		     struct p2p_noa_desc *desc1, struct p2p_noa_desc *desc2)
288{
289	/* Notice of Absence */
290	wpabuf_put_u8(buf, P2P_ATTR_NOTICE_OF_ABSENCE);
291	wpabuf_put_le16(buf, 2 + (desc1 ? 13 : 0) + (desc2 ? 13 : 0));
292	wpabuf_put_u8(buf, noa_index);
293	wpabuf_put_u8(buf, (opp_ps ? 0x80 : 0) | (ctwindow & 0x7f));
294	p2p_buf_add_noa_desc(buf, desc1);
295	p2p_buf_add_noa_desc(buf, desc2);
296	wpa_printf(MSG_DEBUG, "P2P: * Notice of Absence");
297}
298
299
300void p2p_buf_add_ext_listen_timing(struct wpabuf *buf, u16 period,
301				   u16 interval)
302{
303	/* Extended Listen Timing */
304	wpabuf_put_u8(buf, P2P_ATTR_EXT_LISTEN_TIMING);
305	wpabuf_put_le16(buf, 4);
306	wpabuf_put_le16(buf, period);
307	wpabuf_put_le16(buf, interval);
308	wpa_printf(MSG_DEBUG, "P2P: * Extended Listen Timing (period %u msec  "
309		   "interval %u msec)", period, interval);
310}
311
312
313void p2p_buf_add_p2p_interface(struct wpabuf *buf, struct p2p_data *p2p)
314{
315	/* P2P Interface */
316	wpabuf_put_u8(buf, P2P_ATTR_INTERFACE);
317	wpabuf_put_le16(buf, ETH_ALEN + 1 + ETH_ALEN);
318	/* P2P Device address */
319	wpabuf_put_data(buf, p2p->cfg->dev_addr, ETH_ALEN);
320	/*
321	 * FIX: Fetch interface address list from driver. Do not include
322	 * the P2P Device address if it is never used as interface address.
323	 */
324	/* P2P Interface Address Count */
325	wpabuf_put_u8(buf, 1);
326	wpabuf_put_data(buf, p2p->cfg->dev_addr, ETH_ALEN);
327}
328
329
330static void p2p_add_wps_string(struct wpabuf *buf, enum wps_attribute attr,
331			       const char *val)
332{
333	size_t len;
334
335	wpabuf_put_be16(buf, attr);
336	len = val ? os_strlen(val) : 0;
337#ifndef CONFIG_WPS_STRICT
338	if (len == 0) {
339		/*
340		 * Some deployed WPS implementations fail to parse zeor-length
341		 * attributes. As a workaround, send a space character if the
342		 * device attribute string is empty.
343		 */
344		wpabuf_put_be16(buf, 1);
345		wpabuf_put_u8(buf, ' ');
346		return;
347	}
348#endif /* CONFIG_WPS_STRICT */
349	wpabuf_put_be16(buf, len);
350	if (val)
351		wpabuf_put_data(buf, val, len);
352}
353
354
355void p2p_build_wps_ie(struct p2p_data *p2p, struct wpabuf *buf, int pw_id,
356		      int all_attr)
357{
358	u8 *len;
359	int i;
360
361	wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC);
362	len = wpabuf_put(buf, 1);
363	wpabuf_put_be32(buf, WPS_DEV_OUI_WFA);
364
365	wps_build_version(buf);
366
367	if (all_attr) {
368		wpabuf_put_be16(buf, ATTR_WPS_STATE);
369		wpabuf_put_be16(buf, 1);
370		wpabuf_put_u8(buf, WPS_STATE_NOT_CONFIGURED);
371	}
372
373	if (pw_id >= 0) {
374		/* Device Password ID */
375		wpabuf_put_be16(buf, ATTR_DEV_PASSWORD_ID);
376		wpabuf_put_be16(buf, 2);
377		wpa_printf(MSG_DEBUG, "P2P: WPS IE Device Password ID: %d",
378			   pw_id);
379		wpabuf_put_be16(buf, pw_id);
380	}
381
382	if (all_attr) {
383		wpabuf_put_be16(buf, ATTR_RESPONSE_TYPE);
384		wpabuf_put_be16(buf, 1);
385		wpabuf_put_u8(buf, WPS_RESP_ENROLLEE_INFO);
386
387		wps_build_uuid_e(buf, p2p->cfg->uuid);
388		p2p_add_wps_string(buf, ATTR_MANUFACTURER,
389				   p2p->cfg->manufacturer);
390		p2p_add_wps_string(buf, ATTR_MODEL_NAME, p2p->cfg->model_name);
391		p2p_add_wps_string(buf, ATTR_MODEL_NUMBER,
392				   p2p->cfg->model_number);
393		p2p_add_wps_string(buf, ATTR_SERIAL_NUMBER,
394				   p2p->cfg->serial_number);
395
396		wpabuf_put_be16(buf, ATTR_PRIMARY_DEV_TYPE);
397		wpabuf_put_be16(buf, WPS_DEV_TYPE_LEN);
398		wpabuf_put_data(buf, p2p->cfg->pri_dev_type, WPS_DEV_TYPE_LEN);
399
400		p2p_add_wps_string(buf, ATTR_DEV_NAME, p2p->cfg->dev_name);
401
402		wpabuf_put_be16(buf, ATTR_CONFIG_METHODS);
403		wpabuf_put_be16(buf, 2);
404		wpabuf_put_be16(buf, p2p->cfg->config_methods);
405	}
406
407	wps_build_wfa_ext(buf, 0, NULL, 0);
408
409	if (all_attr && p2p->cfg->num_sec_dev_types) {
410		wpabuf_put_be16(buf, ATTR_SECONDARY_DEV_TYPE_LIST);
411		wpabuf_put_be16(buf, WPS_DEV_TYPE_LEN *
412				p2p->cfg->num_sec_dev_types);
413		wpabuf_put_data(buf, p2p->cfg->sec_dev_type,
414				WPS_DEV_TYPE_LEN *
415				p2p->cfg->num_sec_dev_types);
416	}
417
418	/* Add the WPS vendor extensions */
419	for (i = 0; i < P2P_MAX_WPS_VENDOR_EXT; i++) {
420		if (p2p->wps_vendor_ext[i] == NULL)
421			break;
422		if (wpabuf_tailroom(buf) <
423		    4 + wpabuf_len(p2p->wps_vendor_ext[i]))
424			continue;
425		wpabuf_put_be16(buf, ATTR_VENDOR_EXT);
426		wpabuf_put_be16(buf, wpabuf_len(p2p->wps_vendor_ext[i]));
427		wpabuf_put_buf(buf, p2p->wps_vendor_ext[i]);
428	}
429
430	p2p_buf_update_ie_hdr(buf, len);
431}
432