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#include "l2_packet.h"
25#include "wpa_supplicant.h"
26
27
28struct wpa_driver_hostap_data {
29	void *wext; /* private data for driver_wext */
30	void *ctx;
31	char ifname[IFNAMSIZ + 1];
32	int sock;
33	int current_mode; /* infra/adhoc */
34};
35
36
37static int hostapd_ioctl(struct wpa_driver_hostap_data *drv,
38			 struct prism2_hostapd_param *param,
39			 int len, int show_err)
40{
41	struct iwreq iwr;
42
43	os_memset(&iwr, 0, sizeof(iwr));
44	os_strncpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
45	iwr.u.data.pointer = (caddr_t) param;
46	iwr.u.data.length = len;
47
48	if (ioctl(drv->sock, PRISM2_IOCTL_HOSTAPD, &iwr) < 0) {
49		int ret = errno;
50		if (show_err)
51			perror("ioctl[PRISM2_IOCTL_HOSTAPD]");
52		return ret;
53	}
54
55	return 0;
56}
57
58
59static int wpa_driver_hostap_set_wpa_ie(struct wpa_driver_hostap_data *drv,
60					const u8 *wpa_ie, size_t wpa_ie_len)
61{
62	struct prism2_hostapd_param *param;
63	int res;
64	size_t blen = PRISM2_HOSTAPD_GENERIC_ELEMENT_HDR_LEN + wpa_ie_len;
65	if (blen < sizeof(*param))
66		blen = sizeof(*param);
67
68	param = os_zalloc(blen);
69	if (param == NULL)
70		return -1;
71
72	param->cmd = PRISM2_HOSTAPD_SET_GENERIC_ELEMENT;
73	param->u.generic_elem.len = wpa_ie_len;
74	os_memcpy(param->u.generic_elem.data, wpa_ie, wpa_ie_len);
75	res = hostapd_ioctl(drv, param, blen, 1);
76
77	os_free(param);
78
79	return res;
80}
81
82
83static int prism2param(struct wpa_driver_hostap_data *drv, int param,
84		       int value)
85{
86	struct iwreq iwr;
87	int *i, ret = 0;
88
89	os_memset(&iwr, 0, sizeof(iwr));
90	os_strncpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
91	i = (int *) iwr.u.name;
92	*i++ = param;
93	*i++ = value;
94
95	if (ioctl(drv->sock, PRISM2_IOCTL_PRISM2_PARAM, &iwr) < 0) {
96		perror("ioctl[PRISM2_IOCTL_PRISM2_PARAM]");
97		ret = -1;
98	}
99	return ret;
100}
101
102
103static int wpa_driver_hostap_set_wpa(void *priv, int enabled)
104{
105	struct wpa_driver_hostap_data *drv = priv;
106	int ret = 0;
107
108	wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);
109
110	if (!enabled && wpa_driver_hostap_set_wpa_ie(drv, NULL, 0) < 0)
111		ret = -1;
112	if (prism2param(drv, PRISM2_PARAM_HOST_ROAMING, enabled ? 2 : 0) < 0)
113		ret = -1;
114	if (prism2param(drv, PRISM2_PARAM_WPA, enabled) < 0)
115		ret = -1;
116
117	return ret;
118}
119
120
121static void show_set_key_error(struct prism2_hostapd_param *param)
122{
123	switch (param->u.crypt.err) {
124	case HOSTAP_CRYPT_ERR_UNKNOWN_ALG:
125		wpa_printf(MSG_INFO, "Unknown algorithm '%s'.",
126			   param->u.crypt.alg);
127		wpa_printf(MSG_INFO, "You may need to load kernel module to "
128			   "register that algorithm.");
129		wpa_printf(MSG_INFO, "E.g., 'modprobe hostap_crypt_wep' for "
130			   "WEP.");
131		break;
132	case HOSTAP_CRYPT_ERR_UNKNOWN_ADDR:
133		wpa_printf(MSG_INFO, "Unknown address " MACSTR ".",
134			   MAC2STR(param->sta_addr));
135		break;
136	case HOSTAP_CRYPT_ERR_CRYPT_INIT_FAILED:
137		wpa_printf(MSG_INFO, "Crypt algorithm initialization failed.");
138		break;
139	case HOSTAP_CRYPT_ERR_KEY_SET_FAILED:
140		wpa_printf(MSG_INFO, "Key setting failed.");
141		break;
142	case HOSTAP_CRYPT_ERR_TX_KEY_SET_FAILED:
143		wpa_printf(MSG_INFO, "TX key index setting failed.");
144		break;
145	case HOSTAP_CRYPT_ERR_CARD_CONF_FAILED:
146		wpa_printf(MSG_INFO, "Card configuration failed.");
147		break;
148	}
149}
150
151
152static int wpa_driver_hostap_set_key(void *priv, wpa_alg alg,
153				     const u8 *addr, int key_idx,
154				     int set_tx, const u8 *seq, size_t seq_len,
155				     const u8 *key, size_t key_len)
156{
157	struct wpa_driver_hostap_data *drv = priv;
158	struct prism2_hostapd_param *param;
159	u8 *buf;
160	size_t blen;
161	int ret = 0;
162	char *alg_name;
163
164	switch (alg) {
165	case WPA_ALG_NONE:
166		alg_name = "none";
167		break;
168	case WPA_ALG_WEP:
169		alg_name = "WEP";
170		break;
171	case WPA_ALG_TKIP:
172		alg_name = "TKIP";
173		break;
174	case WPA_ALG_CCMP:
175		alg_name = "CCMP";
176		break;
177	default:
178		return -1;
179	}
180
181	wpa_printf(MSG_DEBUG, "%s: alg=%s key_idx=%d set_tx=%d seq_len=%lu "
182		   "key_len=%lu", __FUNCTION__, alg_name, key_idx, set_tx,
183		   (unsigned long) seq_len, (unsigned long) key_len);
184
185	if (seq_len > 8)
186		return -2;
187
188	blen = sizeof(*param) + key_len;
189	buf = os_zalloc(blen);
190	if (buf == NULL)
191		return -1;
192
193	param = (struct prism2_hostapd_param *) buf;
194	param->cmd = PRISM2_SET_ENCRYPTION;
195	/* TODO: In theory, STA in client mode can use five keys; four default
196	 * keys for receiving (with keyidx 0..3) and one individual key for
197	 * both transmitting and receiving (keyidx 0) _unicast_ packets. Now,
198	 * keyidx 0 is reserved for this unicast use and default keys can only
199	 * use keyidx 1..3 (i.e., default key with keyidx 0 is not supported).
200	 * This should be fine for more or less all cases, but for completeness
201	 * sake, the driver could be enhanced to support the missing key. */
202#if 0
203	if (addr == NULL)
204		os_memset(param->sta_addr, 0xff, ETH_ALEN);
205	else
206		os_memcpy(param->sta_addr, addr, ETH_ALEN);
207#else
208	os_memset(param->sta_addr, 0xff, ETH_ALEN);
209#endif
210	os_strncpy((char *) param->u.crypt.alg, alg_name,
211		   HOSTAP_CRYPT_ALG_NAME_LEN);
212	param->u.crypt.flags = set_tx ? HOSTAP_CRYPT_FLAG_SET_TX_KEY : 0;
213	param->u.crypt.idx = key_idx;
214	os_memcpy(param->u.crypt.seq, seq, seq_len);
215	param->u.crypt.key_len = key_len;
216	os_memcpy((u8 *) (param + 1), key, key_len);
217
218	if (hostapd_ioctl(drv, param, blen, 1)) {
219		wpa_printf(MSG_WARNING, "Failed to set encryption.");
220		show_set_key_error(param);
221		ret = -1;
222	}
223	os_free(buf);
224
225	return ret;
226}
227
228
229static int wpa_driver_hostap_set_countermeasures(void *priv, int enabled)
230{
231	struct wpa_driver_hostap_data *drv = priv;
232	wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);
233	return prism2param(drv, PRISM2_PARAM_TKIP_COUNTERMEASURES, enabled);
234}
235
236
237static int wpa_driver_hostap_set_drop_unencrypted(void *priv, int enabled)
238{
239	struct wpa_driver_hostap_data *drv = priv;
240	wpa_printf(MSG_DEBUG, "%s: enabled=%d", __FUNCTION__, enabled);
241	return prism2param(drv, PRISM2_PARAM_DROP_UNENCRYPTED, enabled);
242}
243
244
245static int wpa_driver_hostap_reset(struct wpa_driver_hostap_data *drv,
246				   int type)
247{
248	struct iwreq iwr;
249	int *i, ret = 0;
250
251	wpa_printf(MSG_DEBUG, "%s: type=%d", __FUNCTION__, type);
252
253	os_memset(&iwr, 0, sizeof(iwr));
254	os_strncpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
255	i = (int *) iwr.u.name;
256	*i++ = type;
257
258	if (ioctl(drv->sock, PRISM2_IOCTL_RESET, &iwr) < 0) {
259	        perror("ioctl[PRISM2_IOCTL_RESET]");
260	        ret = -1;
261	}
262	return ret;
263}
264
265
266static int wpa_driver_hostap_mlme(struct wpa_driver_hostap_data *drv,
267				  const u8 *addr, int cmd, int reason_code)
268{
269	struct prism2_hostapd_param param;
270	int ret;
271
272	/* There does not seem to be a better way of deauthenticating or
273	 * disassociating with Prism2/2.5/3 than sending the management frame
274	 * and then resetting the Port0 to make sure both the AP and the STA
275	 * end up in disconnected state. */
276	os_memset(&param, 0, sizeof(param));
277	param.cmd = PRISM2_HOSTAPD_MLME;
278	os_memcpy(param.sta_addr, addr, ETH_ALEN);
279	param.u.mlme.cmd = cmd;
280	param.u.mlme.reason_code = reason_code;
281	ret = hostapd_ioctl(drv, &param, sizeof(param), 1);
282	if (ret == 0) {
283		os_sleep(0, 100000);
284		ret = wpa_driver_hostap_reset(drv, 2);
285	}
286	return ret;
287}
288
289
290static int wpa_driver_hostap_deauthenticate(void *priv, const u8 *addr,
291					    int reason_code)
292{
293	struct wpa_driver_hostap_data *drv = priv;
294	wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
295	return wpa_driver_hostap_mlme(drv, addr, MLME_STA_DEAUTH,
296				      reason_code);
297}
298
299
300static int wpa_driver_hostap_disassociate(void *priv, const u8 *addr,
301					  int reason_code)
302{
303	struct wpa_driver_hostap_data *drv = priv;
304	wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
305	return wpa_driver_hostap_mlme(drv, addr, MLME_STA_DISASSOC,
306				      reason_code);
307}
308
309
310static int
311wpa_driver_hostap_associate(void *priv,
312			    struct wpa_driver_associate_params *params)
313{
314	struct wpa_driver_hostap_data *drv = priv;
315	int ret = 0;
316	int allow_unencrypted_eapol;
317
318	wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
319
320	if (params->mode != drv->current_mode) {
321		/* At the moment, Host AP driver requires host_roaming=2 for
322		 * infrastructure mode and host_roaming=0 for adhoc. */
323		if (prism2param(drv, PRISM2_PARAM_HOST_ROAMING,
324				params->mode == IEEE80211_MODE_IBSS ? 0 : 2) <
325		    0) {
326			wpa_printf(MSG_DEBUG, "%s: failed to set host_roaming",
327				   __func__);
328		}
329		drv->current_mode = params->mode;
330	}
331
332	if (prism2param(drv, PRISM2_PARAM_PRIVACY_INVOKED,
333			params->key_mgmt_suite != KEY_MGMT_NONE) < 0)
334		ret = -1;
335	if (wpa_driver_hostap_set_wpa_ie(drv, params->wpa_ie,
336					 params->wpa_ie_len) < 0)
337		ret = -1;
338	if (wpa_driver_wext_set_mode(drv->wext, params->mode) < 0)
339		ret = -1;
340	if (params->freq &&
341	    wpa_driver_wext_set_freq(drv->wext, params->freq) < 0)
342		ret = -1;
343	if (wpa_driver_wext_set_ssid(drv->wext, params->ssid, params->ssid_len)
344	    < 0)
345		ret = -1;
346	if (wpa_driver_wext_set_bssid(drv->wext, params->bssid) < 0)
347		ret = -1;
348
349	/* Allow unencrypted EAPOL messages even if pairwise keys are set when
350	 * not using WPA. IEEE 802.1X specifies that these frames are not
351	 * encrypted, but WPA encrypts them when pairwise keys are in use. */
352	if (params->key_mgmt_suite == KEY_MGMT_802_1X ||
353	    params->key_mgmt_suite == KEY_MGMT_PSK)
354		allow_unencrypted_eapol = 0;
355	else
356		allow_unencrypted_eapol = 1;
357
358	if (prism2param(drv, PRISM2_PARAM_IEEE_802_1X,
359			allow_unencrypted_eapol) < 0) {
360		wpa_printf(MSG_DEBUG, "hostap: Failed to configure "
361			   "ieee_802_1x param");
362		/* Ignore this error.. driver_hostap.c can also be used with
363		 * other drivers that do not support this prism2_param. */
364	}
365
366	return ret;
367}
368
369
370static int wpa_driver_hostap_scan(void *priv, const u8 *ssid, size_t ssid_len)
371{
372	struct wpa_driver_hostap_data *drv = priv;
373	struct prism2_hostapd_param param;
374	int ret;
375
376	if (ssid == NULL) {
377		/* Use standard Linux Wireless Extensions ioctl if possible
378		 * because some drivers using hostap code in wpa_supplicant
379		 * might not support Host AP specific scan request (with SSID
380		 * info). */
381		return wpa_driver_wext_scan(drv->wext, ssid, ssid_len);
382	}
383
384	if (ssid_len > 32)
385		ssid_len = 32;
386
387	os_memset(&param, 0, sizeof(param));
388	param.cmd = PRISM2_HOSTAPD_SCAN_REQ;
389	param.u.scan_req.ssid_len = ssid_len;
390	os_memcpy(param.u.scan_req.ssid, ssid, ssid_len);
391	ret = hostapd_ioctl(drv, &param, sizeof(param), 1);
392
393	/* Not all drivers generate "scan completed" wireless event, so try to
394	 * read results after a timeout. */
395	eloop_cancel_timeout(wpa_driver_wext_scan_timeout, drv->wext,
396			     drv->ctx);
397	eloop_register_timeout(3, 0, wpa_driver_wext_scan_timeout, drv->wext,
398			       drv->ctx);
399
400	return ret;
401}
402
403
404static int wpa_driver_hostap_set_auth_alg(void *priv, int auth_alg)
405{
406	struct wpa_driver_hostap_data *drv = priv;
407	int algs = 0;
408
409	if (auth_alg & AUTH_ALG_OPEN_SYSTEM)
410		algs |= 1;
411	if (auth_alg & AUTH_ALG_SHARED_KEY)
412		algs |= 2;
413	if (auth_alg & AUTH_ALG_LEAP)
414		algs |= 4;
415	if (algs == 0)
416		algs = 1; /* at least one algorithm should be set */
417
418	return prism2param(drv, PRISM2_PARAM_AP_AUTH_ALGS, algs);
419}
420
421
422static int wpa_driver_hostap_get_bssid(void *priv, u8 *bssid)
423{
424	struct wpa_driver_hostap_data *drv = priv;
425	return wpa_driver_wext_get_bssid(drv->wext, bssid);
426}
427
428
429static int wpa_driver_hostap_get_ssid(void *priv, u8 *ssid)
430{
431	struct wpa_driver_hostap_data *drv = priv;
432	return wpa_driver_wext_get_ssid(drv->wext, ssid);
433}
434
435
436static int wpa_driver_hostap_get_scan_results(void *priv,
437					      struct wpa_scan_result *results,
438					      size_t max_size)
439{
440	struct wpa_driver_hostap_data *drv = priv;
441	return wpa_driver_wext_get_scan_results(drv->wext, results, max_size);
442}
443
444
445static int wpa_driver_hostap_set_operstate(void *priv, int state)
446{
447	struct wpa_driver_hostap_data *drv = priv;
448	return wpa_driver_wext_set_operstate(drv->wext, state);
449}
450
451
452static void * wpa_driver_hostap_init(void *ctx, const char *ifname)
453{
454	struct wpa_driver_hostap_data *drv;
455
456	drv = os_zalloc(sizeof(*drv));
457	if (drv == NULL)
458		return NULL;
459	drv->wext = wpa_driver_wext_init(ctx, ifname);
460	if (drv->wext == NULL) {
461		os_free(drv);
462		return NULL;
463	}
464
465	drv->ctx = ctx;
466	os_strncpy(drv->ifname, ifname, sizeof(drv->ifname));
467	drv->sock = socket(PF_INET, SOCK_DGRAM, 0);
468	if (drv->sock < 0) {
469		perror("socket");
470		wpa_driver_wext_deinit(drv->wext);
471		os_free(drv);
472		return NULL;
473	}
474
475	if (os_strncmp(ifname, "wlan", 4) == 0) {
476		/*
477		 * Host AP driver may use both wlan# and wifi# interface in
478		 * wireless events.
479		 */
480		char ifname2[IFNAMSIZ + 1];
481		os_strncpy(ifname2, ifname, sizeof(ifname2));
482		os_memcpy(ifname2, "wifi", 4);
483		wpa_driver_wext_alternative_ifindex(drv->wext, ifname2);
484	}
485
486	return drv;
487}
488
489
490static void wpa_driver_hostap_deinit(void *priv)
491{
492	struct wpa_driver_hostap_data *drv = priv;
493	wpa_driver_wext_deinit(drv->wext);
494	close(drv->sock);
495	os_free(drv);
496}
497
498
499const struct wpa_driver_ops wpa_driver_hostap_ops = {
500	.name = "hostap",
501	.desc = "Host AP driver (Intersil Prism2/2.5/3)",
502	.get_bssid = wpa_driver_hostap_get_bssid,
503	.get_ssid = wpa_driver_hostap_get_ssid,
504	.set_wpa = wpa_driver_hostap_set_wpa,
505	.set_key = wpa_driver_hostap_set_key,
506	.set_countermeasures = wpa_driver_hostap_set_countermeasures,
507	.set_drop_unencrypted = wpa_driver_hostap_set_drop_unencrypted,
508	.scan = wpa_driver_hostap_scan,
509	.get_scan_results = wpa_driver_hostap_get_scan_results,
510	.deauthenticate = wpa_driver_hostap_deauthenticate,
511	.disassociate = wpa_driver_hostap_disassociate,
512	.associate = wpa_driver_hostap_associate,
513	.set_auth_alg = wpa_driver_hostap_set_auth_alg,
514	.init = wpa_driver_hostap_init,
515	.deinit = wpa_driver_hostap_deinit,
516	.set_operstate = wpa_driver_hostap_set_operstate,
517};
518