p2p_build.c revision 5460547a121207cf7a99eac45e05fcdd83be3161 
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	wpa_hexdump_ascii(MSG_DEBUG, "P2P: P2P Group ID SSID", ssid, ssid_len);
262}
263
264
265void p2p_buf_add_invitation_flags(struct wpabuf *buf, u8 flags)
266{
267	/* Invitation Flags */
268	wpabuf_put_u8(buf, P2P_ATTR_INVITATION_FLAGS);
269	wpabuf_put_le16(buf, 1);
270	wpabuf_put_u8(buf, flags);
271	wpa_printf(MSG_DEBUG, "P2P: * Invitation Flags: bitmap 0x%x", flags);
272}
273
274
275static void p2p_buf_add_noa_desc(struct wpabuf *buf, struct p2p_noa_desc *desc)
276{
277	if (desc == NULL)
278		return;
279
280	wpabuf_put_u8(buf, desc->count_type);
281	wpabuf_put_le32(buf, desc->duration);
282	wpabuf_put_le32(buf, desc->interval);
283	wpabuf_put_le32(buf, desc->start_time);
284}
285
286
287void p2p_buf_add_noa(struct wpabuf *buf, u8 noa_index, u8 opp_ps, u8 ctwindow,
288		     struct p2p_noa_desc *desc1, struct p2p_noa_desc *desc2)
289{
290	/* Notice of Absence */
291	wpabuf_put_u8(buf, P2P_ATTR_NOTICE_OF_ABSENCE);
292	wpabuf_put_le16(buf, 2 + (desc1 ? 13 : 0) + (desc2 ? 13 : 0));
293	wpabuf_put_u8(buf, noa_index);
294	wpabuf_put_u8(buf, (opp_ps ? 0x80 : 0) | (ctwindow & 0x7f));
295	p2p_buf_add_noa_desc(buf, desc1);
296	p2p_buf_add_noa_desc(buf, desc2);
297	wpa_printf(MSG_DEBUG, "P2P: * Notice of Absence");
298}
299
300
301void p2p_buf_add_ext_listen_timing(struct wpabuf *buf, u16 period,
302				   u16 interval)
303{
304	/* Extended Listen Timing */
305	wpabuf_put_u8(buf, P2P_ATTR_EXT_LISTEN_TIMING);
306	wpabuf_put_le16(buf, 4);
307	wpabuf_put_le16(buf, period);
308	wpabuf_put_le16(buf, interval);
309	wpa_printf(MSG_DEBUG, "P2P: * Extended Listen Timing (period %u msec  "
310		   "interval %u msec)", period, interval);
311}
312
313
314void p2p_buf_add_p2p_interface(struct wpabuf *buf, struct p2p_data *p2p)
315{
316	/* P2P Interface */
317	wpabuf_put_u8(buf, P2P_ATTR_INTERFACE);
318	wpabuf_put_le16(buf, ETH_ALEN + 1 + ETH_ALEN);
319	/* P2P Device address */
320	wpabuf_put_data(buf, p2p->cfg->dev_addr, ETH_ALEN);
321	/*
322	 * FIX: Fetch interface address list from driver. Do not include
323	 * the P2P Device address if it is never used as interface address.
324	 */
325	/* P2P Interface Address Count */
326	wpabuf_put_u8(buf, 1);
327	wpabuf_put_data(buf, p2p->cfg->dev_addr, ETH_ALEN);
328}
329
330
331static int p2p_add_wps_string(struct wpabuf *buf, enum wps_attribute attr,
332			      const char *val)
333{
334	size_t len;
335
336	len = val ? os_strlen(val) : 0;
337	if (wpabuf_tailroom(buf) < 4 + len)
338		return -1;
339	wpabuf_put_be16(buf, attr);
340#ifndef CONFIG_WPS_STRICT
341	if (len == 0) {
342		/*
343		 * Some deployed WPS implementations fail to parse zeor-length
344		 * attributes. As a workaround, send a space character if the
345		 * device attribute string is empty.
346		 */
347		if (wpabuf_tailroom(buf) < 3)
348			return -1;
349		wpabuf_put_be16(buf, 1);
350		wpabuf_put_u8(buf, ' ');
351		return 0;
352	}
353#endif /* CONFIG_WPS_STRICT */
354	wpabuf_put_be16(buf, len);
355	if (val)
356		wpabuf_put_data(buf, val, len);
357	return 0;
358}
359
360
361int p2p_build_wps_ie(struct p2p_data *p2p, struct wpabuf *buf, int pw_id,
362		     int all_attr)
363{
364	u8 *len;
365	int i;
366
367	if (wpabuf_tailroom(buf) < 6)
368		return -1;
369	wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC);
370	len = wpabuf_put(buf, 1);
371	wpabuf_put_be32(buf, WPS_DEV_OUI_WFA);
372
373	if (wps_build_version(buf) < 0)
374		return -1;
375
376	if (all_attr) {
377		if (wpabuf_tailroom(buf) < 5)
378			return -1;
379		wpabuf_put_be16(buf, ATTR_WPS_STATE);
380		wpabuf_put_be16(buf, 1);
381		wpabuf_put_u8(buf, WPS_STATE_NOT_CONFIGURED);
382	}
383
384	if (pw_id >= 0) {
385		if (wpabuf_tailroom(buf) < 6)
386			return -1;
387		/* Device Password ID */
388		wpabuf_put_be16(buf, ATTR_DEV_PASSWORD_ID);
389		wpabuf_put_be16(buf, 2);
390		wpa_printf(MSG_DEBUG, "P2P: WPS IE Device Password ID: %d",
391			   pw_id);
392		wpabuf_put_be16(buf, pw_id);
393	}
394
395	if (all_attr) {
396		if (wpabuf_tailroom(buf) < 5)
397			return -1;
398		wpabuf_put_be16(buf, ATTR_RESPONSE_TYPE);
399		wpabuf_put_be16(buf, 1);
400		wpabuf_put_u8(buf, WPS_RESP_ENROLLEE_INFO);
401
402		if (wps_build_uuid_e(buf, p2p->cfg->uuid) < 0 ||
403		    p2p_add_wps_string(buf, ATTR_MANUFACTURER,
404				       p2p->cfg->manufacturer) < 0 ||
405		    p2p_add_wps_string(buf, ATTR_MODEL_NAME,
406				       p2p->cfg->model_name) < 0 ||
407		    p2p_add_wps_string(buf, ATTR_MODEL_NUMBER,
408				       p2p->cfg->model_number) < 0 ||
409		    p2p_add_wps_string(buf, ATTR_SERIAL_NUMBER,
410				       p2p->cfg->serial_number) < 0)
411			return -1;
412
413		if (wpabuf_tailroom(buf) < 4 + WPS_DEV_TYPE_LEN)
414			return -1;
415		wpabuf_put_be16(buf, ATTR_PRIMARY_DEV_TYPE);
416		wpabuf_put_be16(buf, WPS_DEV_TYPE_LEN);
417		wpabuf_put_data(buf, p2p->cfg->pri_dev_type, WPS_DEV_TYPE_LEN);
418
419		if (p2p_add_wps_string(buf, ATTR_DEV_NAME, p2p->cfg->dev_name)
420		    < 0)
421			return -1;
422
423		if (wpabuf_tailroom(buf) < 6)
424			return -1;
425		wpabuf_put_be16(buf, ATTR_CONFIG_METHODS);
426		wpabuf_put_be16(buf, 2);
427		wpabuf_put_be16(buf, p2p->cfg->config_methods);
428	}
429
430	if (wps_build_wfa_ext(buf, 0, NULL, 0) < 0)
431		return -1;
432
433	if (all_attr && p2p->cfg->num_sec_dev_types) {
434		if (wpabuf_tailroom(buf) <
435		    4 + WPS_DEV_TYPE_LEN * p2p->cfg->num_sec_dev_types)
436			return -1;
437		wpabuf_put_be16(buf, ATTR_SECONDARY_DEV_TYPE_LIST);
438		wpabuf_put_be16(buf, WPS_DEV_TYPE_LEN *
439				p2p->cfg->num_sec_dev_types);
440		wpabuf_put_data(buf, p2p->cfg->sec_dev_type,
441				WPS_DEV_TYPE_LEN *
442				p2p->cfg->num_sec_dev_types);
443	}
444
445	/* Add the WPS vendor extensions */
446	for (i = 0; i < P2P_MAX_WPS_VENDOR_EXT; i++) {
447		if (p2p->wps_vendor_ext[i] == NULL)
448			break;
449		if (wpabuf_tailroom(buf) <
450		    4 + wpabuf_len(p2p->wps_vendor_ext[i]))
451			continue;
452		wpabuf_put_be16(buf, ATTR_VENDOR_EXT);
453		wpabuf_put_be16(buf, wpabuf_len(p2p->wps_vendor_ext[i]));
454		wpabuf_put_buf(buf, p2p->wps_vendor_ext[i]);
455	}
456
457	p2p_buf_update_ie_hdr(buf, len);
458
459	return 0;
460}
461