Disconnect hostapd from building in base
[dragonfly.git] / contrib / hostapd / src / ap / ieee802_11_ht.c
CommitLineData
4781064b
JM
1/*
2 * hostapd / IEEE 802.11n HT
3 * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
4 * Copyright (c) 2007-2008, Intel Corporation
5 *
6 * This software may be distributed under the terms of the BSD license.
7 * See README for more details.
8 */
9
10#include "utils/includes.h"
11
12#include "utils/common.h"
13#include "common/ieee802_11_defs.h"
14#include "hostapd.h"
15#include "ap_config.h"
16#include "sta_info.h"
17#include "beacon.h"
18#include "ieee802_11.h"
19
20
21u8 * hostapd_eid_ht_capabilities(struct hostapd_data *hapd, u8 *eid)
22{
23 struct ieee80211_ht_capabilities *cap;
24 u8 *pos = eid;
25
26 if (!hapd->iconf->ieee80211n || !hapd->iface->current_mode ||
27 hapd->conf->disable_11n)
28 return eid;
29
30 *pos++ = WLAN_EID_HT_CAP;
31 *pos++ = sizeof(*cap);
32
33 cap = (struct ieee80211_ht_capabilities *) pos;
34 os_memset(cap, 0, sizeof(*cap));
35 cap->ht_capabilities_info = host_to_le16(hapd->iconf->ht_capab);
36 cap->a_mpdu_params = hapd->iface->current_mode->a_mpdu_params;
37 os_memcpy(cap->supported_mcs_set, hapd->iface->current_mode->mcs_set,
38 16);
39
40 /* TODO: ht_extended_capabilities (now fully disabled) */
41 /* TODO: tx_bf_capability_info (now fully disabled) */
42 /* TODO: asel_capabilities (now fully disabled) */
43
44 pos += sizeof(*cap);
45
46 if (hapd->iconf->obss_interval) {
47 struct ieee80211_obss_scan_parameters *scan_params;
48
49 *pos++ = WLAN_EID_OVERLAPPING_BSS_SCAN_PARAMS;
50 *pos++ = sizeof(*scan_params);
51
52 scan_params = (struct ieee80211_obss_scan_parameters *) pos;
53 os_memset(scan_params, 0, sizeof(*scan_params));
54 scan_params->width_trigger_scan_interval =
55 host_to_le16(hapd->iconf->obss_interval);
56
57 /* TODO: Fill in more parameters (supplicant ignores them) */
58
59 pos += sizeof(*scan_params);
60 }
61
62 return pos;
63}
64
65
66u8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid)
67{
68 struct ieee80211_ht_operation *oper;
69 u8 *pos = eid;
70
71 if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
72 return eid;
73
74 *pos++ = WLAN_EID_HT_OPERATION;
75 *pos++ = sizeof(*oper);
76
77 oper = (struct ieee80211_ht_operation *) pos;
78 os_memset(oper, 0, sizeof(*oper));
79
80 oper->control_chan = hapd->iconf->channel;
81 oper->operation_mode = host_to_le16(hapd->iface->ht_op_mode);
82 if (hapd->iconf->secondary_channel == 1)
83 oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE |
84 HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH;
85 if (hapd->iconf->secondary_channel == -1)
86 oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW |
87 HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH;
88
89 pos += sizeof(*oper);
90
91 return pos;
92}
93
94
95/*
96op_mode
97Set to 0 (HT pure) under the followign conditions
98 - all STAs in the BSS are 20/40 MHz HT in 20/40 MHz BSS or
99 - all STAs in the BSS are 20 MHz HT in 20 MHz BSS
100Set to 1 (HT non-member protection) if there may be non-HT STAs
101 in both the primary and the secondary channel
102Set to 2 if only HT STAs are associated in BSS,
103 however and at least one 20 MHz HT STA is associated
104Set to 3 (HT mixed mode) when one or more non-HT STAs are associated
105*/
106int hostapd_ht_operation_update(struct hostapd_iface *iface)
107{
108 u16 cur_op_mode, new_op_mode;
109 int op_mode_changes = 0;
110
111 if (!iface->conf->ieee80211n || iface->conf->ht_op_mode_fixed)
112 return 0;
113
114 wpa_printf(MSG_DEBUG, "%s current operation mode=0x%X",
115 __func__, iface->ht_op_mode);
116
117 if (!(iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT)
118 && iface->num_sta_ht_no_gf) {
119 iface->ht_op_mode |=
120 HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT;
121 op_mode_changes++;
122 } else if ((iface->ht_op_mode &
123 HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT) &&
124 iface->num_sta_ht_no_gf == 0) {
125 iface->ht_op_mode &=
126 ~HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT;
127 op_mode_changes++;
128 }
129
130 if (!(iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT) &&
131 (iface->num_sta_no_ht || iface->olbc_ht)) {
132 iface->ht_op_mode |= HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT;
133 op_mode_changes++;
134 } else if ((iface->ht_op_mode &
135 HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT) &&
136 (iface->num_sta_no_ht == 0 && !iface->olbc_ht)) {
137 iface->ht_op_mode &=
138 ~HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT;
139 op_mode_changes++;
140 }
141
142 new_op_mode = 0;
143 if (iface->num_sta_no_ht)
144 new_op_mode = OP_MODE_MIXED;
145 else if (iface->conf->secondary_channel && iface->num_sta_ht_20mhz)
146 new_op_mode = OP_MODE_20MHZ_HT_STA_ASSOCED;
147 else if (iface->olbc_ht)
148 new_op_mode = OP_MODE_MAY_BE_LEGACY_STAS;
149 else
150 new_op_mode = OP_MODE_PURE;
151
152 cur_op_mode = iface->ht_op_mode & HT_INFO_OPERATION_MODE_OP_MODE_MASK;
153 if (cur_op_mode != new_op_mode) {
154 iface->ht_op_mode &= ~HT_INFO_OPERATION_MODE_OP_MODE_MASK;
155 iface->ht_op_mode |= new_op_mode;
156 op_mode_changes++;
157 }
158
159 wpa_printf(MSG_DEBUG, "%s new operation mode=0x%X changes=%d",
160 __func__, iface->ht_op_mode, op_mode_changes);
161
162 return op_mode_changes;
163}
164
165
166u16 copy_sta_ht_capab(struct hostapd_data *hapd, struct sta_info *sta,
167 const u8 *ht_capab, size_t ht_capab_len)
168{
169 /* Disable HT caps for STAs associated to no-HT BSSes. */
170 if (!ht_capab ||
171 ht_capab_len < sizeof(struct ieee80211_ht_capabilities) ||
172 hapd->conf->disable_11n) {
173 sta->flags &= ~WLAN_STA_HT;
174 os_free(sta->ht_capabilities);
175 sta->ht_capabilities = NULL;
176 return WLAN_STATUS_SUCCESS;
177 }
178
179 if (sta->ht_capabilities == NULL) {
180 sta->ht_capabilities =
181 os_zalloc(sizeof(struct ieee80211_ht_capabilities));
182 if (sta->ht_capabilities == NULL)
183 return WLAN_STATUS_UNSPECIFIED_FAILURE;
184 }
185
186 sta->flags |= WLAN_STA_HT;
187 os_memcpy(sta->ht_capabilities, ht_capab,
188 sizeof(struct ieee80211_ht_capabilities));
189
190 return WLAN_STATUS_SUCCESS;
191}
192
193
194static void update_sta_ht(struct hostapd_data *hapd, struct sta_info *sta)
195{
196 u16 ht_capab;
197
198 ht_capab = le_to_host16(sta->ht_capabilities->ht_capabilities_info);
199 wpa_printf(MSG_DEBUG, "HT: STA " MACSTR " HT Capabilities Info: "
200 "0x%04x", MAC2STR(sta->addr), ht_capab);
201 if ((ht_capab & HT_CAP_INFO_GREEN_FIELD) == 0) {
202 if (!sta->no_ht_gf_set) {
203 sta->no_ht_gf_set = 1;
204 hapd->iface->num_sta_ht_no_gf++;
205 }
206 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no greenfield, num "
207 "of non-gf stations %d",
208 __func__, MAC2STR(sta->addr),
209 hapd->iface->num_sta_ht_no_gf);
210 }
211 if ((ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) == 0) {
212 if (!sta->ht_20mhz_set) {
213 sta->ht_20mhz_set = 1;
214 hapd->iface->num_sta_ht_20mhz++;
215 }
216 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - 20 MHz HT, num of "
217 "20MHz HT STAs %d",
218 __func__, MAC2STR(sta->addr),
219 hapd->iface->num_sta_ht_20mhz);
220 }
221}
222
223
224static void update_sta_no_ht(struct hostapd_data *hapd, struct sta_info *sta)
225{
226 if (!sta->no_ht_set) {
227 sta->no_ht_set = 1;
228 hapd->iface->num_sta_no_ht++;
229 }
230 if (hapd->iconf->ieee80211n) {
231 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no HT, num of "
232 "non-HT stations %d",
233 __func__, MAC2STR(sta->addr),
234 hapd->iface->num_sta_no_ht);
235 }
236}
237
238
239void update_ht_state(struct hostapd_data *hapd, struct sta_info *sta)
240{
241 if ((sta->flags & WLAN_STA_HT) && sta->ht_capabilities)
242 update_sta_ht(hapd, sta);
243 else
244 update_sta_no_ht(hapd, sta);
245
246 if (hostapd_ht_operation_update(hapd->iface) > 0)
247 ieee802_11_set_beacons(hapd->iface);
248}
249
250
251void hostapd_get_ht_capab(struct hostapd_data *hapd,
252 struct ieee80211_ht_capabilities *ht_cap,
253 struct ieee80211_ht_capabilities *neg_ht_cap)
254{
255 u16 cap;
256
257 if (ht_cap == NULL)
258 return;
259 os_memcpy(neg_ht_cap, ht_cap, sizeof(*neg_ht_cap));
260 cap = le_to_host16(neg_ht_cap->ht_capabilities_info);
261
262 /*
263 * Mask out HT features we don't support, but don't overwrite
264 * non-symmetric features like STBC and SMPS. Just because
265 * we're not in dynamic SMPS mode the STA might still be.
266 */
267 cap &= (hapd->iconf->ht_capab | HT_CAP_INFO_RX_STBC_MASK |
268 HT_CAP_INFO_TX_STBC | HT_CAP_INFO_SMPS_MASK);
269
270 /*
271 * STBC needs to be handled specially
272 * if we don't support RX STBC, mask out TX STBC in the STA's HT caps
273 * if we don't support TX STBC, mask out RX STBC in the STA's HT caps
274 */
275 if (!(hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK))
276 cap &= ~HT_CAP_INFO_TX_STBC;
277 if (!(hapd->iconf->ht_capab & HT_CAP_INFO_TX_STBC))
278 cap &= ~HT_CAP_INFO_RX_STBC_MASK;
279
280 neg_ht_cap->ht_capabilities_info = host_to_le16(cap);
281}