1/*
2 * Common driver-related functions
3 * Copyright (c) 2003-2011, Jouni Malinen <j@w1.fi>
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#include "utils/common.h"
11#include "driver.h"
12
13void wpa_scan_results_free(struct wpa_scan_results *res)
14{
15	size_t i;
16
17	if (res == NULL)
18		return;
19
20	for (i = 0; i < res->num; i++)
21		os_free(res->res[i]);
22	os_free(res->res);
23	os_free(res);
24}
25
26
27const char * event_to_string(enum wpa_event_type event)
28{
29#define E2S(n) case EVENT_ ## n: return #n
30	switch (event) {
31	E2S(ASSOC);
32	E2S(DISASSOC);
33	E2S(MICHAEL_MIC_FAILURE);
34	E2S(SCAN_RESULTS);
35	E2S(ASSOCINFO);
36	E2S(INTERFACE_STATUS);
37	E2S(PMKID_CANDIDATE);
38	E2S(STKSTART);
39	E2S(TDLS);
40	E2S(FT_RESPONSE);
41	E2S(IBSS_RSN_START);
42	E2S(AUTH);
43	E2S(DEAUTH);
44	E2S(ASSOC_REJECT);
45	E2S(AUTH_TIMED_OUT);
46	E2S(ASSOC_TIMED_OUT);
47	E2S(WPS_BUTTON_PUSHED);
48	E2S(TX_STATUS);
49	E2S(RX_FROM_UNKNOWN);
50	E2S(RX_MGMT);
51	E2S(REMAIN_ON_CHANNEL);
52	E2S(CANCEL_REMAIN_ON_CHANNEL);
53	E2S(RX_PROBE_REQ);
54	E2S(NEW_STA);
55	E2S(EAPOL_RX);
56	E2S(SIGNAL_CHANGE);
57	E2S(INTERFACE_ENABLED);
58	E2S(INTERFACE_DISABLED);
59	E2S(CHANNEL_LIST_CHANGED);
60	E2S(INTERFACE_UNAVAILABLE);
61	E2S(BEST_CHANNEL);
62	E2S(UNPROT_DEAUTH);
63	E2S(UNPROT_DISASSOC);
64	E2S(STATION_LOW_ACK);
65	E2S(IBSS_PEER_LOST);
66	E2S(DRIVER_GTK_REKEY);
67	E2S(SCHED_SCAN_STOPPED);
68	E2S(DRIVER_CLIENT_POLL_OK);
69	E2S(EAPOL_TX_STATUS);
70	E2S(CH_SWITCH);
71	E2S(WNM);
72	E2S(CONNECT_FAILED_REASON);
73	E2S(DFS_RADAR_DETECTED);
74	E2S(DFS_CAC_FINISHED);
75	E2S(DFS_CAC_ABORTED);
76	E2S(DFS_NOP_FINISHED);
77	E2S(SURVEY);
78	E2S(SCAN_STARTED);
79	E2S(AVOID_FREQUENCIES);
80	E2S(NEW_PEER_CANDIDATE);
81	E2S(ACS_CHANNEL_SELECTED);
82	E2S(DFS_CAC_STARTED);
83	}
84
85	return "UNKNOWN";
86#undef E2S
87}
88
89
90const char * channel_width_to_string(enum chan_width width)
91{
92	switch (width) {
93	case CHAN_WIDTH_20_NOHT:
94		return "20 MHz (no HT)";
95	case CHAN_WIDTH_20:
96		return "20 MHz";
97	case CHAN_WIDTH_40:
98		return "40 MHz";
99	case CHAN_WIDTH_80:
100		return "80 MHz";
101	case CHAN_WIDTH_80P80:
102		return "80+80 MHz";
103	case CHAN_WIDTH_160:
104		return "160 MHz";
105	default:
106		return "unknown";
107	}
108}
109
110
111int ht_supported(const struct hostapd_hw_modes *mode)
112{
113	if (!(mode->flags & HOSTAPD_MODE_FLAG_HT_INFO_KNOWN)) {
114		/*
115		 * The driver did not indicate whether it supports HT. Assume
116		 * it does to avoid connection issues.
117		 */
118		return 1;
119	}
120
121	/*
122	 * IEEE Std 802.11n-2009 20.1.1:
123	 * An HT non-AP STA shall support all EQM rates for one spatial stream.
124	 */
125	return mode->mcs_set[0] == 0xff;
126}
127
128
129int vht_supported(const struct hostapd_hw_modes *mode)
130{
131	if (!(mode->flags & HOSTAPD_MODE_FLAG_VHT_INFO_KNOWN)) {
132		/*
133		 * The driver did not indicate whether it supports VHT. Assume
134		 * it does to avoid connection issues.
135		 */
136		return 1;
137	}
138
139	/*
140	 * A VHT non-AP STA shall support MCS 0-7 for one spatial stream.
141	 * TODO: Verify if this complies with the standard
142	 */
143	return (mode->vht_mcs_set[0] & 0x3) != 3;
144}
145
146
147static int wpa_check_wowlan_trigger(const char *start, const char *trigger,
148				    int capa_trigger, u8 *param_trigger)
149{
150	if (os_strcmp(start, trigger) != 0)
151		return 0;
152	if (!capa_trigger)
153		return 0;
154
155	*param_trigger = 1;
156	return 1;
157}
158
159
160struct wowlan_triggers *
161wpa_get_wowlan_triggers(const char *wowlan_triggers,
162			const struct wpa_driver_capa *capa)
163{
164	struct wowlan_triggers *triggers;
165	char *start, *end, *buf;
166	int last;
167
168	if (!wowlan_triggers)
169		return NULL;
170
171	buf = os_strdup(wowlan_triggers);
172	if (buf == NULL)
173		return NULL;
174
175	triggers = os_zalloc(sizeof(*triggers));
176	if (triggers == NULL)
177		goto out;
178
179#define CHECK_TRIGGER(trigger) \
180	wpa_check_wowlan_trigger(start, #trigger,			\
181				  capa->wowlan_triggers.trigger,	\
182				  &triggers->trigger)
183
184	start = buf;
185	while (*start != '\0') {
186		while (isblank(*start))
187			start++;
188		if (*start == '\0')
189			break;
190		end = start;
191		while (!isblank(*end) && *end != '\0')
192			end++;
193		last = *end == '\0';
194		*end = '\0';
195
196		if (!CHECK_TRIGGER(any) &&
197		    !CHECK_TRIGGER(disconnect) &&
198		    !CHECK_TRIGGER(magic_pkt) &&
199		    !CHECK_TRIGGER(gtk_rekey_failure) &&
200		    !CHECK_TRIGGER(eap_identity_req) &&
201		    !CHECK_TRIGGER(four_way_handshake) &&
202		    !CHECK_TRIGGER(rfkill_release)) {
203			wpa_printf(MSG_DEBUG,
204				   "Unknown/unsupported wowlan trigger '%s'",
205				   start);
206			os_free(triggers);
207			triggers = NULL;
208			goto out;
209		}
210
211		if (last)
212			break;
213		start = end + 1;
214	}
215#undef CHECK_TRIGGER
216
217out:
218	os_free(buf);
219	return triggers;
220}
221