p2p_build.c revision 069fa2c39ec7120656a2ea8cca83c5ee41ddab60 
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
139void p2p_buf_add_status(struct wpabuf *buf, u8 status)
140{
141	/* Status */
142	wpabuf_put_u8(buf, P2P_ATTR_STATUS);
143	wpabuf_put_le16(buf, 1);
144	wpabuf_put_u8(buf, status);
145	wpa_printf(MSG_DEBUG, "P2P: * Status: %d", status);
146}
147
148
149void p2p_buf_add_device_info(struct wpabuf *buf, struct p2p_data *p2p,
150			     struct p2p_device *peer)
151{
152	u8 *len;
153	u16 methods;
154	size_t nlen, i;
155
156	/* P2P Device Info */
157	wpabuf_put_u8(buf, P2P_ATTR_DEVICE_INFO);
158	len = wpabuf_put(buf, 2); /* IE length to be filled */
159
160	/* P2P Device address */
161	wpabuf_put_data(buf, p2p->cfg->dev_addr, ETH_ALEN);
162
163	/* Config Methods */
164	methods = 0;
165	if (peer && peer->wps_method != WPS_NOT_READY) {
166		if (peer->wps_method == WPS_PBC)
167			methods |= WPS_CONFIG_PUSHBUTTON;
168		else if (peer->wps_method == WPS_PIN_DISPLAY ||
169			 peer->wps_method == WPS_PIN_KEYPAD)
170			methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
171	} else if (p2p->cfg->config_methods) {
172		methods |= p2p->cfg->config_methods &
173			(WPS_CONFIG_PUSHBUTTON | WPS_CONFIG_DISPLAY |
174			 WPS_CONFIG_KEYPAD);
175	} else {
176		methods |= WPS_CONFIG_PUSHBUTTON;
177		methods |= WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
178	}
179	wpabuf_put_be16(buf, methods);
180
181	/* Primary Device Type */
182	wpabuf_put_data(buf, p2p->cfg->pri_dev_type,
183			sizeof(p2p->cfg->pri_dev_type));
184
185	/* Number of Secondary Device Types */
186	wpabuf_put_u8(buf, p2p->cfg->num_sec_dev_types);
187
188	/* Secondary Device Type List */
189	for (i = 0; i < p2p->cfg->num_sec_dev_types; i++)
190		wpabuf_put_data(buf, p2p->cfg->sec_dev_type[i],
191				WPS_DEV_TYPE_LEN);
192
193	/* Device Name */
194	nlen = p2p->cfg->dev_name ? os_strlen(p2p->cfg->dev_name) : 0;
195	wpabuf_put_be16(buf, ATTR_DEV_NAME);
196	wpabuf_put_be16(buf, nlen);
197	wpabuf_put_data(buf, p2p->cfg->dev_name, nlen);
198
199	/* Update attribute length */
200	WPA_PUT_LE16(len, (u8 *) wpabuf_put(buf, 0) - len - 2);
201	wpa_printf(MSG_DEBUG, "P2P: * Device Info");
202}
203
204
205void p2p_buf_add_device_id(struct wpabuf *buf, const u8 *dev_addr)
206{
207	/* P2P Device ID */
208	wpabuf_put_u8(buf, P2P_ATTR_DEVICE_ID);
209	wpabuf_put_le16(buf, ETH_ALEN);
210	wpabuf_put_data(buf, dev_addr, ETH_ALEN);
211	wpa_printf(MSG_DEBUG, "P2P: * Device ID: " MACSTR, MAC2STR(dev_addr));
212}
213
214
215void p2p_buf_add_config_timeout(struct wpabuf *buf, u8 go_timeout,
216				u8 client_timeout)
217{
218	/* Configuration Timeout */
219	wpabuf_put_u8(buf, P2P_ATTR_CONFIGURATION_TIMEOUT);
220	wpabuf_put_le16(buf, 2);
221	wpabuf_put_u8(buf, go_timeout);
222	wpabuf_put_u8(buf, client_timeout);
223	wpa_printf(MSG_DEBUG, "P2P: * Configuration Timeout: GO %d (*10ms)  "
224		   "client %d (*10ms)", go_timeout, client_timeout);
225}
226
227
228void p2p_buf_add_intended_addr(struct wpabuf *buf, const u8 *interface_addr)
229{
230	/* Intended P2P Interface Address */
231	wpabuf_put_u8(buf, P2P_ATTR_INTENDED_INTERFACE_ADDR);
232	wpabuf_put_le16(buf, ETH_ALEN);
233	wpabuf_put_data(buf, interface_addr, ETH_ALEN);
234	wpa_printf(MSG_DEBUG, "P2P: * Intended P2P Interface Address " MACSTR,
235		   MAC2STR(interface_addr));
236}
237
238
239void p2p_buf_add_group_bssid(struct wpabuf *buf, const u8 *bssid)
240{
241	/* P2P Group BSSID */
242	wpabuf_put_u8(buf, P2P_ATTR_GROUP_BSSID);
243	wpabuf_put_le16(buf, ETH_ALEN);
244	wpabuf_put_data(buf, bssid, ETH_ALEN);
245	wpa_printf(MSG_DEBUG, "P2P: * P2P Group BSSID " MACSTR,
246		   MAC2STR(bssid));
247}
248
249
250void p2p_buf_add_group_id(struct wpabuf *buf, const u8 *dev_addr,
251			  const u8 *ssid, size_t ssid_len)
252{
253	/* P2P Group ID */
254	wpabuf_put_u8(buf, P2P_ATTR_GROUP_ID);
255	wpabuf_put_le16(buf, ETH_ALEN + ssid_len);
256	wpabuf_put_data(buf, dev_addr, ETH_ALEN);
257	wpabuf_put_data(buf, ssid, ssid_len);
258	wpa_printf(MSG_DEBUG, "P2P: * P2P Group ID " MACSTR,
259		   MAC2STR(dev_addr));
260}
261
262
263void p2p_buf_add_invitation_flags(struct wpabuf *buf, u8 flags)
264{
265	/* Invitation Flags */
266	wpabuf_put_u8(buf, P2P_ATTR_INVITATION_FLAGS);
267	wpabuf_put_le16(buf, 1);
268	wpabuf_put_u8(buf, flags);
269	wpa_printf(MSG_DEBUG, "P2P: * Invitation Flags: bitmap 0x%x", flags);
270}
271
272
273static void p2p_buf_add_noa_desc(struct wpabuf *buf, struct p2p_noa_desc *desc)
274{
275	if (desc == NULL)
276		return;
277
278	wpabuf_put_u8(buf, desc->count_type);
279	wpabuf_put_le32(buf, desc->duration);
280	wpabuf_put_le32(buf, desc->interval);
281	wpabuf_put_le32(buf, desc->start_time);
282}
283
284
285void p2p_buf_add_noa(struct wpabuf *buf, u8 noa_index, u8 opp_ps, u8 ctwindow,
286		     struct p2p_noa_desc *desc1, struct p2p_noa_desc *desc2)
287{
288	/* Notice of Absence */
289	wpabuf_put_u8(buf, P2P_ATTR_NOTICE_OF_ABSENCE);
290	wpabuf_put_le16(buf, 2 + (desc1 ? 13 : 0) + (desc2 ? 13 : 0));
291	wpabuf_put_u8(buf, noa_index);
292	wpabuf_put_u8(buf, (opp_ps ? 0x80 : 0) | (ctwindow & 0x7f));
293	p2p_buf_add_noa_desc(buf, desc1);
294	p2p_buf_add_noa_desc(buf, desc2);
295	wpa_printf(MSG_DEBUG, "P2P: * Notice of Absence");
296}
297
298
299void p2p_buf_add_ext_listen_timing(struct wpabuf *buf, u16 period,
300				   u16 interval)
301{
302	/* Extended Listen Timing */
303	wpabuf_put_u8(buf, P2P_ATTR_EXT_LISTEN_TIMING);
304	wpabuf_put_le16(buf, 4);
305	wpabuf_put_le16(buf, period);
306	wpabuf_put_le16(buf, interval);
307	wpa_printf(MSG_DEBUG, "P2P: * Extended Listen Timing (period %u msec  "
308		   "interval %u msec)", period, interval);
309}
310
311
312void p2p_buf_add_p2p_interface(struct wpabuf *buf, struct p2p_data *p2p)
313{
314	/* P2P Interface */
315	wpabuf_put_u8(buf, P2P_ATTR_INTERFACE);
316	wpabuf_put_le16(buf, ETH_ALEN + 1 + ETH_ALEN);
317	/* P2P Device address */
318	wpabuf_put_data(buf, p2p->cfg->dev_addr, ETH_ALEN);
319	/*
320	 * FIX: Fetch interface address list from driver. Do not include
321	 * the P2P Device address if it is never used as interface address.
322	 */
323	/* P2P Interface Address Count */
324	wpabuf_put_u8(buf, 1);
325	wpabuf_put_data(buf, p2p->cfg->dev_addr, ETH_ALEN);
326}
327
328
329static void p2p_add_wps_string(struct wpabuf *buf, enum wps_attribute attr,
330			       const char *val)
331{
332	size_t len;
333
334	wpabuf_put_be16(buf, attr);
335	len = val ? os_strlen(val) : 0;
336#ifndef CONFIG_WPS_STRICT
337	if (len == 0) {
338		/*
339		 * Some deployed WPS implementations fail to parse zeor-length
340		 * attributes. As a workaround, send a space character if the
341		 * device attribute string is empty.
342		 */
343		wpabuf_put_be16(buf, 1);
344		wpabuf_put_u8(buf, ' ');
345		return;
346	}
347#endif /* CONFIG_WPS_STRICT */
348	wpabuf_put_be16(buf, len);
349	if (val)
350		wpabuf_put_data(buf, val, len);
351}
352
353
354void p2p_build_wps_ie(struct p2p_data *p2p, struct wpabuf *buf, int pw_id,
355		      int all_attr)
356{
357	u8 *len;
358	int i;
359
360	wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC);
361	len = wpabuf_put(buf, 1);
362	wpabuf_put_be32(buf, WPS_DEV_OUI_WFA);
363
364	wps_build_version(buf);
365
366	if (all_attr) {
367		wpabuf_put_be16(buf, ATTR_WPS_STATE);
368		wpabuf_put_be16(buf, 1);
369		wpabuf_put_u8(buf, WPS_STATE_NOT_CONFIGURED);
370	}
371
372	if (pw_id >= 0) {
373		/* Device Password ID */
374		wpabuf_put_be16(buf, ATTR_DEV_PASSWORD_ID);
375		wpabuf_put_be16(buf, 2);
376		wpa_printf(MSG_DEBUG, "P2P: WPS IE Device Password ID: %d",
377			   pw_id);
378		wpabuf_put_be16(buf, pw_id);
379	}
380
381	if (all_attr) {
382		wpabuf_put_be16(buf, ATTR_RESPONSE_TYPE);
383		wpabuf_put_be16(buf, 1);
384		wpabuf_put_u8(buf, WPS_RESP_ENROLLEE_INFO);
385
386		wps_build_uuid_e(buf, p2p->cfg->uuid);
387		p2p_add_wps_string(buf, ATTR_MANUFACTURER,
388				   p2p->cfg->manufacturer);
389		p2p_add_wps_string(buf, ATTR_MODEL_NAME, p2p->cfg->model_name);
390		p2p_add_wps_string(buf, ATTR_MODEL_NUMBER,
391				   p2p->cfg->model_number);
392		p2p_add_wps_string(buf, ATTR_SERIAL_NUMBER,
393				   p2p->cfg->serial_number);
394
395		wpabuf_put_be16(buf, ATTR_PRIMARY_DEV_TYPE);
396		wpabuf_put_be16(buf, WPS_DEV_TYPE_LEN);
397		wpabuf_put_data(buf, p2p->cfg->pri_dev_type, WPS_DEV_TYPE_LEN);
398
399		p2p_add_wps_string(buf, ATTR_DEV_NAME, p2p->cfg->dev_name);
400
401		wpabuf_put_be16(buf, ATTR_CONFIG_METHODS);
402		wpabuf_put_be16(buf, 2);
403		wpabuf_put_be16(buf, p2p->cfg->config_methods);
404	}
405
406	wps_build_wfa_ext(buf, 0, NULL, 0);
407
408	if (all_attr && p2p->cfg->num_sec_dev_types) {
409		wpabuf_put_be16(buf, ATTR_SECONDARY_DEV_TYPE_LIST);
410		wpabuf_put_be16(buf, WPS_DEV_TYPE_LEN *
411				p2p->cfg->num_sec_dev_types);
412		wpabuf_put_data(buf, p2p->cfg->sec_dev_type,
413				WPS_DEV_TYPE_LEN *
414				p2p->cfg->num_sec_dev_types);
415	}
416
417	/* Add the WPS vendor extensions */
418	for (i = 0; i < P2P_MAX_WPS_VENDOR_EXT; i++) {
419		if (p2p->wps_vendor_ext[i] == NULL)
420			break;
421		if (wpabuf_tailroom(buf) <
422		    4 + wpabuf_len(p2p->wps_vendor_ext[i]))
423			continue;
424		wpabuf_put_be16(buf, ATTR_VENDOR_EXT);
425		wpabuf_put_be16(buf, wpabuf_len(p2p->wps_vendor_ext[i]));
426		wpabuf_put_buf(buf, p2p->wps_vendor_ext[i]);
427	}
428
429	p2p_buf_update_ie_hdr(buf, len);
430}
431