1 /*
2 * hostapd / IEEE 802.11ac VHT
3 * Copyright (c) 2002-2009, 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 BSD license
7 *
8 * See README and COPYING for more details.
9 */
10
11 #include "utils/includes.h"
12
13 #include "utils/common.h"
14 #include "common/ieee802_11_defs.h"
15 #include "hostapd.h"
16 #include "ap_config.h"
17 #include "sta_info.h"
18 #include "beacon.h"
19 #include "ieee802_11.h"
20
21
hostapd_eid_vht_capabilities(struct hostapd_data * hapd,u8 * eid)22 u8 * hostapd_eid_vht_capabilities(struct hostapd_data *hapd, u8 *eid)
23 {
24 struct ieee80211_vht_capabilities *cap;
25 u8 *pos = eid;
26
27 if (!hapd->iconf->ieee80211ac || !hapd->iface->current_mode ||
28 hapd->conf->disable_11ac)
29 return eid;
30
31 *pos++ = WLAN_EID_VHT_CAP;
32 *pos++ = sizeof(*cap);
33
34 cap = (struct ieee80211_vht_capabilities *) pos;
35 os_memset(cap, 0, sizeof(*cap));
36 cap->vht_capabilities_info = host_to_le32(
37 hapd->iface->conf->vht_capab);
38
39 /* Supported MCS set comes from hw */
40 os_memcpy(&cap->vht_supported_mcs_set,
41 hapd->iface->current_mode->vht_mcs_set, 8);
42
43 pos += sizeof(*cap);
44
45 return pos;
46 }
47
48
hostapd_eid_vht_operation(struct hostapd_data * hapd,u8 * eid)49 u8 * hostapd_eid_vht_operation(struct hostapd_data *hapd, u8 *eid)
50 {
51 struct ieee80211_vht_operation *oper;
52 u8 *pos = eid;
53
54 if (!hapd->iconf->ieee80211ac || hapd->conf->disable_11ac)
55 return eid;
56
57 *pos++ = WLAN_EID_VHT_OPERATION;
58 *pos++ = sizeof(*oper);
59
60 oper = (struct ieee80211_vht_operation *) pos;
61 os_memset(oper, 0, sizeof(*oper));
62
63 /*
64 * center freq = 5 GHz + (5 * index)
65 * So index 42 gives center freq 5.210 GHz
66 * which is channel 42 in 5G band
67 */
68 oper->vht_op_info_chan_center_freq_seg0_idx =
69 hapd->iconf->vht_oper_centr_freq_seg0_idx;
70 oper->vht_op_info_chan_center_freq_seg1_idx =
71 hapd->iconf->vht_oper_centr_freq_seg1_idx;
72
73 oper->vht_op_info_chwidth = hapd->iconf->vht_oper_chwidth;
74
75 /* VHT Basic MCS set comes from hw */
76 /* Hard code 1 stream, MCS0-7 is a min Basic VHT MCS rates */
77 oper->vht_basic_mcs_set = host_to_le16(0xfffc);
78 pos += sizeof(*oper);
79
80 return pos;
81 }
82
83
copy_sta_vht_capab(struct hostapd_data * hapd,struct sta_info * sta,const u8 * vht_capab,size_t vht_capab_len)84 u16 copy_sta_vht_capab(struct hostapd_data *hapd, struct sta_info *sta,
85 const u8 *vht_capab, size_t vht_capab_len)
86 {
87 /* Disable VHT caps for STAs associated to no-VHT BSSes. */
88 if (!vht_capab ||
89 vht_capab_len < sizeof(struct ieee80211_vht_capabilities) ||
90 hapd->conf->disable_11ac) {
91 sta->flags &= ~WLAN_STA_VHT;
92 os_free(sta->vht_capabilities);
93 sta->vht_capabilities = NULL;
94 return WLAN_STATUS_SUCCESS;
95 }
96
97 if (sta->vht_capabilities == NULL) {
98 sta->vht_capabilities =
99 os_zalloc(sizeof(struct ieee80211_vht_capabilities));
100 if (sta->vht_capabilities == NULL)
101 return WLAN_STATUS_UNSPECIFIED_FAILURE;
102 }
103
104 sta->flags |= WLAN_STA_VHT;
105 os_memcpy(sta->vht_capabilities, vht_capab,
106 sizeof(struct ieee80211_vht_capabilities));
107
108 return WLAN_STATUS_SUCCESS;
109 }
110
111
set_sta_vht_opmode(struct hostapd_data * hapd,struct sta_info * sta,const u8 * vht_oper_notif)112 u16 set_sta_vht_opmode(struct hostapd_data *hapd, struct sta_info *sta,
113 const u8 *vht_oper_notif)
114 {
115 if (!vht_oper_notif) {
116 sta->flags &= ~WLAN_STA_VHT_OPMODE_ENABLED;
117 return WLAN_STATUS_SUCCESS;
118 }
119
120 sta->flags |= WLAN_STA_VHT_OPMODE_ENABLED;
121 sta->vht_opmode = *vht_oper_notif;
122 return WLAN_STATUS_SUCCESS;
123 }
124
125
hostapd_get_vht_capab(struct hostapd_data * hapd,struct ieee80211_vht_capabilities * vht_cap,struct ieee80211_vht_capabilities * neg_vht_cap)126 void hostapd_get_vht_capab(struct hostapd_data *hapd,
127 struct ieee80211_vht_capabilities *vht_cap,
128 struct ieee80211_vht_capabilities *neg_vht_cap)
129 {
130 u32 cap, own_cap, sym_caps;
131
132 if (vht_cap == NULL)
133 return;
134 os_memcpy(neg_vht_cap, vht_cap, sizeof(*neg_vht_cap));
135
136 cap = le_to_host32(neg_vht_cap->vht_capabilities_info);
137 own_cap = hapd->iconf->vht_capab;
138
139 /* mask out symmetric VHT capabilities we don't support */
140 sym_caps = VHT_CAP_SHORT_GI_80 | VHT_CAP_SHORT_GI_160;
141 cap &= ~sym_caps | (own_cap & sym_caps);
142
143 /* mask out beamformer/beamformee caps if not supported */
144 if (!(own_cap & VHT_CAP_SU_BEAMFORMER_CAPABLE))
145 cap &= ~(VHT_CAP_SU_BEAMFORMEE_CAPABLE |
146 VHT_CAP_BEAMFORMEE_STS_MAX);
147
148 if (!(own_cap & VHT_CAP_SU_BEAMFORMEE_CAPABLE))
149 cap &= ~(VHT_CAP_SU_BEAMFORMER_CAPABLE |
150 VHT_CAP_SOUNDING_DIMENSION_MAX);
151
152 if (!(own_cap & VHT_CAP_MU_BEAMFORMER_CAPABLE))
153 cap &= ~VHT_CAP_MU_BEAMFORMEE_CAPABLE;
154
155 if (!(own_cap & VHT_CAP_MU_BEAMFORMEE_CAPABLE))
156 cap &= ~VHT_CAP_MU_BEAMFORMER_CAPABLE;
157
158 /* mask channel widths we don't support */
159 switch (own_cap & VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
160 case VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
161 break;
162 case VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
163 if (cap & VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) {
164 cap &= ~VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
165 cap |= VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
166 }
167 break;
168 default:
169 cap &= ~VHT_CAP_SUPP_CHAN_WIDTH_MASK;
170 break;
171 }
172
173 if (!(cap & VHT_CAP_SUPP_CHAN_WIDTH_MASK))
174 cap &= ~VHT_CAP_SHORT_GI_160;
175
176 /*
177 * if we don't support RX STBC, mask out TX STBC in the STA's HT caps
178 * if we don't support TX STBC, mask out RX STBC in the STA's HT caps
179 */
180 if (!(own_cap & VHT_CAP_RXSTBC_MASK))
181 cap &= ~VHT_CAP_TXSTBC;
182 if (!(own_cap & VHT_CAP_TXSTBC))
183 cap &= ~VHT_CAP_RXSTBC_MASK;
184
185 neg_vht_cap->vht_capabilities_info = host_to_le32(cap);
186 }
187