Disconnect hostapd from building in base
[dragonfly.git] / contrib / hostapd / src / ap / ieee802_11_ht.c
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
21 u8 * 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
66 u8 * 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 /*
96 op_mode
97 Set 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
100 Set to 1 (HT non-member protection) if there may be non-HT STAs
101         in both the primary and the secondary channel
102 Set to 2 if only HT STAs are associated in BSS,
103         however and at least one 20 MHz HT STA is associated
104 Set to 3 (HT mixed mode) when one or more non-HT STAs are associated
105 */
106 int 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
166 u16 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
194 static 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
224 static 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
239 void 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
251 void 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 }