1/*
2 * WPA Supplicant - driver interaction with Linux Host AP driver
3 * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
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#include <sys/ioctl.h>
17
18#include "wireless_copy.h"
19#include "common.h"
20#include "driver.h"
21#include "driver_wext.h"
22#include "eloop.h"
23#include "driver_hostap.h"
24
25
26struct wpa_driver_hostap_data {
27	void *wext; /* private data for driver_wext */
28	void *ctx;
29	char ifname[IFNAMSIZ + 1];
30	int sock;
31	int current_mode; /* infra/adhoc */
32};
33
34
35static int hostapd_ioctl(struct wpa_driver_hostap_data *drv,
36			 struct prism2_hostapd_param *param,
37			 int len, int show_err)
38{
39	struct iwreq iwr;
40
41	os_memset(&iwr, 0, sizeof(iwr));
42	os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
43	iwr.u.data.pointer = (caddr_t) param;
44	iwr.u.data.length = len;
45
46	if (ioctl(drv->sock, PRISM2_IOCTL_HOSTAPD, &iwr) < 0) {
47		int ret = errno;
48		if (show_err)
49			perror("ioctl[PRISM2_IOCTL_HOSTAPD]");
50		return ret;
51	}
52
53	return 0;
54}
55
56
57static int wpa_driver_hostap_set_wpa_ie(struct wpa_driver_hostap_data *drv,
58					const u8 *wpa_ie, size_t wpa_ie_len)
59{
60	struct prism2_hostapd_param *param;
61	int res;
62	size_t blen = PRISM2_HOSTAPD_GENERIC_ELEMENT_HDR_LEN + wpa_ie_len;
63	if (blen < sizeof(*param))
64		blen = sizeof(*param);
65
66	param = os_zalloc(blen);
67	if (param == NULL)
68		return -1;
69
70	param->cmd = PRISM2_HOSTAPD_SET_GENERIC_ELEMENT;
71	param->u.generic_elem.len = wpa_ie_len;
72	os_memcpy(param->u.generic_elem.data, wpa_ie, wpa_ie_len);
73	res = hostapd_ioctl(drv, param, blen, 1);
74
75	os_free(param);
76
77	return res;
78}
79
80
81static int prism2param(struct wpa_driver_hostap_data *drv, int param,
82		       int value)
83{
84	struct iwreq iwr;
85	int *i, ret = 0;
86
87	os_memset(&iwr, 0, sizeof(iwr));
88	os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
89	i = (int *) iwr.u.name;
90	*i++ = param;
91	*i++ = value;
92
93	if (ioctl(drv->sock, PRISM2_IOCTL_PRISM2_PARAM, &iwr) < 0) {
94		perror("ioctl[PRISM2_IOCTL_PRISM2_PARAM]");
95		ret = -1;
96	}
97	return ret;
98}
99
100
101static int wpa_driver_hostap_set_wpa(void *priv, int enabled)
102{
103	struct wpa_driver_hostap_data *drv = priv;
104	int ret = 0;
105
106	wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);
107
108	if (!enabled && wpa_driver_hostap_set_wpa_ie(drv, NULL, 0) < 0)
109		ret = -1;
110	if (prism2param(drv, PRISM2_PARAM_HOST_ROAMING, enabled ? 2 : 0) < 0)
111		ret = -1;
112	if (prism2param(drv, PRISM2_PARAM_WPA, enabled) < 0)
113		ret = -1;
114
115	return ret;
116}
117
118
119static void show_set_key_error(struct prism2_hostapd_param *param)
120{
121	switch (param->u.crypt.err) {
122	case HOSTAP_CRYPT_ERR_UNKNOWN_ALG:
123		wpa_printf(MSG_INFO, "Unknown algorithm '%s'.",
124			   param->u.crypt.alg);
125		wpa_printf(MSG_INFO, "You may need to load kernel module to "
126			   "register that algorithm.");
127		wpa_printf(MSG_INFO, "E.g., 'modprobe hostap_crypt_wep' for "
128			   "WEP.");
129		break;
130	case HOSTAP_CRYPT_ERR_UNKNOWN_ADDR:
131		wpa_printf(MSG_INFO, "Unknown address " MACSTR ".",
132			   MAC2STR(param->sta_addr));
133		break;
134	case HOSTAP_CRYPT_ERR_CRYPT_INIT_FAILED:
135		wpa_printf(MSG_INFO, "Crypt algorithm initialization failed.");
136		break;
137	case HOSTAP_CRYPT_ERR_KEY_SET_FAILED:
138		wpa_printf(MSG_INFO, "Key setting failed.");
139		break;
140	case HOSTAP_CRYPT_ERR_TX_KEY_SET_FAILED:
141		wpa_printf(MSG_INFO, "TX key index setting failed.");
142		break;
143	case HOSTAP_CRYPT_ERR_CARD_CONF_FAILED:
144		wpa_printf(MSG_INFO, "Card configuration failed.");
145		break;
146	}
147}
148
149
150static int wpa_driver_hostap_set_key(void *priv, wpa_alg alg,
151				     const u8 *addr, int key_idx,
152				     int set_tx, const u8 *seq, size_t seq_len,
153				     const u8 *key, size_t key_len)
154{
155	struct wpa_driver_hostap_data *drv = priv;
156	struct prism2_hostapd_param *param;
157	u8 *buf;
158	size_t blen;
159	int ret = 0;
160	char *alg_name;
161
162	switch (alg) {
163	case WPA_ALG_NONE:
164		alg_name = "none";
165		break;
166	case WPA_ALG_WEP:
167		alg_name = "WEP";
168		break;
169	case WPA_ALG_TKIP:
170		alg_name = "TKIP";
171		break;
172	case WPA_ALG_CCMP:
173		alg_name = "CCMP";
174		break;
175	default:
176		return -1;
177	}
178
179	wpa_printf(MSG_DEBUG, "%s: alg=%s key_idx=%d set_tx=%d seq_len=%lu "
180		   "key_len=%lu", __FUNCTION__, alg_name, key_idx, set_tx,
181		   (unsigned long) seq_len, (unsigned long) key_len);
182
183	if (seq_len > 8)
184		return -2;
185
186	blen = sizeof(*param) + key_len;
187	buf = os_zalloc(blen);
188	if (buf == NULL)
189		return -1;
190
191	param = (struct prism2_hostapd_param *) buf;
192	param->cmd = PRISM2_SET_ENCRYPTION;
193	/* TODO: In theory, STA in client mode can use five keys; four default
194	 * keys for receiving (with keyidx 0..3) and one individual key for
195	 * both transmitting and receiving (keyidx 0) _unicast_ packets. Now,
196	 * keyidx 0 is reserved for this unicast use and default keys can only
197	 * use keyidx 1..3 (i.e., default key with keyidx 0 is not supported).
198	 * This should be fine for more or less all cases, but for completeness
199	 * sake, the driver could be enhanced to support the missing key. */
200#if 0
201	if (addr == NULL)
202		os_memset(param->sta_addr, 0xff, ETH_ALEN);
203	else
204		os_memcpy(param->sta_addr, addr, ETH_ALEN);
205#else
206	os_memset(param->sta_addr, 0xff, ETH_ALEN);
207#endif
208	os_strlcpy((char *) param->u.crypt.alg, alg_name,
209		   HOSTAP_CRYPT_ALG_NAME_LEN);
210	param->u.crypt.flags = set_tx ? HOSTAP_CRYPT_FLAG_SET_TX_KEY : 0;
211	param->u.crypt.idx = key_idx;
212	os_memcpy(param->u.crypt.seq, seq, seq_len);
213	param->u.crypt.key_len = key_len;
214	os_memcpy((u8 *) (param + 1), key, key_len);
215
216	if (hostapd_ioctl(drv, param, blen, 1)) {
217		wpa_printf(MSG_WARNING, "Failed to set encryption.");
218		show_set_key_error(param);
219		ret = -1;
220	}
221	os_free(buf);
222
223	return ret;
224}
225
226
227static int wpa_driver_hostap_set_countermeasures(void *priv, int enabled)
228{
229	struct wpa_driver_hostap_data *drv = priv;
230	wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);
231	return prism2param(drv, PRISM2_PARAM_TKIP_COUNTERMEASURES, enabled);
232}
233
234
235static int wpa_driver_hostap_set_drop_unencrypted(void *priv, int enabled)
236{
237	struct wpa_driver_hostap_data *drv = priv;
238	wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);
239	return prism2param(drv, PRISM2_PARAM_DROP_UNENCRYPTED, enabled);
240}
241
242
243static int wpa_driver_hostap_reset(struct wpa_driver_hostap_data *drv,
244				   int type)
245{
246	struct iwreq iwr;
247	int *i, ret = 0;
248
249	wpa_printf(MSG_DEBUG, "%s: type=%d", __FUNCTION__, type);
250
251	os_memset(&iwr, 0, sizeof(iwr));
252	os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
253	i = (int *) iwr.u.name;
254	*i++ = type;
255
256	if (ioctl(drv->sock, PRISM2_IOCTL_RESET, &iwr) < 0) {
257	        perror("ioctl[PRISM2_IOCTL_RESET]");
258	        ret = -1;
259	}
260	return ret;
261}
262
263
264static int wpa_driver_hostap_mlme(struct wpa_driver_hostap_data *drv,
265				  const u8 *addr, int cmd, int reason_code)
266{
267	struct prism2_hostapd_param param;
268	int ret;
269
270	/* There does not seem to be a better way of deauthenticating or
271	 * disassociating with Prism2/2.5/3 than sending the management frame
272	 * and then resetting the Port0 to make sure both the AP and the STA
273	 * end up in disconnected state. */
274	os_memset(&param, 0, sizeof(param));
275	param.cmd = PRISM2_HOSTAPD_MLME;
276	os_memcpy(param.sta_addr, addr, ETH_ALEN);
277	param.u.mlme.cmd = cmd;
278	param.u.mlme.reason_code = reason_code;
279	ret = hostapd_ioctl(drv, &param, sizeof(param), 1);
280	if (ret == 0) {
281		os_sleep(0, 100000);
282		ret = wpa_driver_hostap_reset(drv, 2);
283	}
284	return ret;
285}
286
287
288static int wpa_driver_hostap_deauthenticate(void *priv, const u8 *addr,
289					    int reason_code)
290{
291	struct wpa_driver_hostap_data *drv = priv;
292	wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
293	return wpa_driver_hostap_mlme(drv, addr, MLME_STA_DEAUTH,
294				      reason_code);
295}
296
297
298static int wpa_driver_hostap_disassociate(void *priv, const u8 *addr,
299					  int reason_code)
300{
301	struct wpa_driver_hostap_data *drv = priv;
302	wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
303	return wpa_driver_hostap_mlme(drv, addr, MLME_STA_DISASSOC,
304				      reason_code);
305}
306
307
308static int
309wpa_driver_hostap_associate(void *priv,
310			    struct wpa_driver_associate_params *params)
311{
312	struct wpa_driver_hostap_data *drv = priv;
313	int ret = 0;
314	int allow_unencrypted_eapol;
315
316	wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
317
318	if (params->mode != drv->current_mode) {
319		/* At the moment, Host AP driver requires host_roaming=2 for
320		 * infrastructure mode and host_roaming=0 for adhoc. */
321		if (prism2param(drv, PRISM2_PARAM_HOST_ROAMING,
322				params->mode == IEEE80211_MODE_IBSS ? 0 : 2) <
323		    0) {
324			wpa_printf(MSG_DEBUG, "%s: failed to set host_roaming",
325				   __func__);
326		}
327		drv->current_mode = params->mode;
328	}
329
330	if (prism2param(drv, PRISM2_PARAM_PRIVACY_INVOKED,
331			params->key_mgmt_suite != KEY_MGMT_NONE) < 0)
332		ret = -1;
333	if (wpa_driver_hostap_set_wpa_ie(drv, params->wpa_ie,
334					 params->wpa_ie_len) < 0)
335		ret = -1;
336	if (wpa_driver_wext_set_mode(drv->wext, params->mode) < 0)
337		ret = -1;
338	if (params->freq &&
339	    wpa_driver_wext_set_freq(drv->wext, params->freq) < 0)
340		ret = -1;
341	if (wpa_driver_wext_set_ssid(drv->wext, params->ssid, params->ssid_len)
342	    < 0)
343		ret = -1;
344	if (wpa_driver_wext_set_bssid(drv->wext, params->bssid) < 0)
345		ret = -1;
346
347	/* Allow unencrypted EAPOL messages even if pairwise keys are set when
348	 * not using WPA. IEEE 802.1X specifies that these frames are not
349	 * encrypted, but WPA encrypts them when pairwise keys are in use. */
350	if (params->key_mgmt_suite == KEY_MGMT_802_1X ||
351	    params->key_mgmt_suite == KEY_MGMT_PSK)
352		allow_unencrypted_eapol = 0;
353	else
354		allow_unencrypted_eapol = 1;
355
356	if (prism2param(drv, PRISM2_PARAM_IEEE_802_1X,
357			allow_unencrypted_eapol) < 0) {
358		wpa_printf(MSG_DEBUG, "hostap: Failed to configure "
359			   "ieee_802_1x param");
360		/* Ignore this error.. driver_hostap.c can also be used with
361		 * other drivers that do not support this prism2_param. */
362	}
363
364	return ret;
365}
366
367
368static int wpa_driver_hostap_scan(void *priv, const u8 *ssid, size_t ssid_len)
369{
370	struct wpa_driver_hostap_data *drv = priv;
371	struct prism2_hostapd_param param;
372	int ret;
373
374	if (ssid == NULL) {
375		/* Use standard Linux Wireless Extensions ioctl if possible
376		 * because some drivers using hostap code in wpa_supplicant
377		 * might not support Host AP specific scan request (with SSID
378		 * info). */
379		return wpa_driver_wext_scan(drv->wext, ssid, ssid_len);
380	}
381
382	if (ssid_len > 32)
383		ssid_len = 32;
384
385	os_memset(&param, 0, sizeof(param));
386	param.cmd = PRISM2_HOSTAPD_SCAN_REQ;
387	param.u.scan_req.ssid_len = ssid_len;
388	os_memcpy(param.u.scan_req.ssid, ssid, ssid_len);
389	ret = hostapd_ioctl(drv, &param, sizeof(param), 1);
390
391	/* Not all drivers generate "scan completed" wireless event, so try to
392	 * read results after a timeout. */
393	eloop_cancel_timeout(wpa_driver_wext_scan_timeout, drv->wext,
394			     drv->ctx);
395	eloop_register_timeout(3, 0, wpa_driver_wext_scan_timeout, drv->wext,
396			       drv->ctx);
397
398	return ret;
399}
400
401
402static int wpa_driver_hostap_set_auth_alg(void *priv, int auth_alg)
403{
404	struct wpa_driver_hostap_data *drv = priv;
405	int algs = 0;
406
407	if (auth_alg & AUTH_ALG_OPEN_SYSTEM)
408		algs |= 1;
409	if (auth_alg & AUTH_ALG_SHARED_KEY)
410		algs |= 2;
411	if (auth_alg & AUTH_ALG_LEAP)
412		algs |= 4;
413	if (algs == 0)
414		algs = 1; /* at least one algorithm should be set */
415
416	return prism2param(drv, PRISM2_PARAM_AP_AUTH_ALGS, algs);
417}
418
419
420static int wpa_driver_hostap_get_bssid(void *priv, u8 *bssid)
421{
422	struct wpa_driver_hostap_data *drv = priv;
423	return wpa_driver_wext_get_bssid(drv->wext, bssid);
424}
425
426
427static int wpa_driver_hostap_get_ssid(void *priv, u8 *ssid)
428{
429	struct wpa_driver_hostap_data *drv = priv;
430	return wpa_driver_wext_get_ssid(drv->wext, ssid);
431}
432
433
434static struct wpa_scan_results * wpa_driver_hostap_get_scan_results(void *priv)
435{
436	struct wpa_driver_hostap_data *drv = priv;
437	return wpa_driver_wext_get_scan_results(drv->wext);
438}
439
440
441static int wpa_driver_hostap_set_operstate(void *priv, int state)
442{
443	struct wpa_driver_hostap_data *drv = priv;
444	return wpa_driver_wext_set_operstate(drv->wext, state);
445}
446
447
448static void * wpa_driver_hostap_init(void *ctx, const char *ifname)
449{
450	struct wpa_driver_hostap_data *drv;
451
452	drv = os_zalloc(sizeof(*drv));
453	if (drv == NULL)
454		return NULL;
455	drv->wext = wpa_driver_wext_init(ctx, ifname);
456	if (drv->wext == NULL) {
457		os_free(drv);
458		return NULL;
459	}
460
461	drv->ctx = ctx;
462	os_strlcpy(drv->ifname, ifname, sizeof(drv->ifname));
463	drv->sock = socket(PF_INET, SOCK_DGRAM, 0);
464	if (drv->sock < 0) {
465		perror("socket");
466		wpa_driver_wext_deinit(drv->wext);
467		os_free(drv);
468		return NULL;
469	}
470
471	if (os_strncmp(ifname, "wlan", 4) == 0) {
472		/*
473		 * Host AP driver may use both wlan# and wifi# interface in
474		 * wireless events.
475		 */
476		char ifname2[IFNAMSIZ + 1];
477		os_strlcpy(ifname2, ifname, sizeof(ifname2));
478		os_memcpy(ifname2, "wifi", 4);
479		wpa_driver_wext_alternative_ifindex(drv->wext, ifname2);
480	}
481
482	return drv;
483}
484
485
486static void wpa_driver_hostap_deinit(void *priv)
487{
488	struct wpa_driver_hostap_data *drv = priv;
489	wpa_driver_wext_deinit(drv->wext);
490	close(drv->sock);
491	os_free(drv);
492}
493
494
495const struct wpa_driver_ops wpa_driver_hostap_ops = {
496	.name = "hostap",
497	.desc = "Host AP driver (Intersil Prism2/2.5/3)",
498	.get_bssid = wpa_driver_hostap_get_bssid,
499	.get_ssid = wpa_driver_hostap_get_ssid,
500	.set_wpa = wpa_driver_hostap_set_wpa,
501	.set_key = wpa_driver_hostap_set_key,
502	.set_countermeasures = wpa_driver_hostap_set_countermeasures,
503	.set_drop_unencrypted = wpa_driver_hostap_set_drop_unencrypted,
504	.scan = wpa_driver_hostap_scan,
505	.get_scan_results2 = wpa_driver_hostap_get_scan_results,
506	.deauthenticate = wpa_driver_hostap_deauthenticate,
507	.disassociate = wpa_driver_hostap_disassociate,
508	.associate = wpa_driver_hostap_associate,
509	.set_auth_alg = wpa_driver_hostap_set_auth_alg,
510	.init = wpa_driver_hostap_init,
511	.deinit = wpa_driver_hostap_deinit,
512	.set_operstate = wpa_driver_hostap_set_operstate,
513};
514