Branch data Line data Source code
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 : 643 : u8 * hostapd_eid_ht_capabilities(struct hostapd_data *hapd, u8 *eid)
22 : : {
23 : : struct ieee80211_ht_capabilities *cap;
24 : 643 : u8 *pos = eid;
25 : :
26 [ + + ][ + - ]: 643 : if (!hapd->iconf->ieee80211n || !hapd->iface->current_mode ||
[ - + ]
27 : 642 : hapd->conf->disable_11n)
28 : 1 : return eid;
29 : :
30 : 642 : *pos++ = WLAN_EID_HT_CAP;
31 : 642 : *pos++ = sizeof(*cap);
32 : :
33 : 642 : cap = (struct ieee80211_ht_capabilities *) pos;
34 : 642 : os_memset(cap, 0, sizeof(*cap));
35 : 642 : cap->ht_capabilities_info = host_to_le16(hapd->iconf->ht_capab);
36 : 642 : cap->a_mpdu_params = hapd->iface->current_mode->a_mpdu_params;
37 : 642 : 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 : 642 : pos += sizeof(*cap);
45 : :
46 [ - + ]: 642 : if (hapd->iconf->obss_interval) {
47 : : struct ieee80211_obss_scan_parameters *scan_params;
48 : :
49 : 0 : *pos++ = WLAN_EID_OVERLAPPING_BSS_SCAN_PARAMS;
50 : 0 : *pos++ = sizeof(*scan_params);
51 : :
52 : 0 : scan_params = (struct ieee80211_obss_scan_parameters *) pos;
53 : 0 : os_memset(scan_params, 0, sizeof(*scan_params));
54 : 0 : scan_params->width_trigger_scan_interval =
55 : 0 : host_to_le16(hapd->iconf->obss_interval);
56 : :
57 : : /* TODO: Fill in more parameters (supplicant ignores them) */
58 : :
59 : 0 : pos += sizeof(*scan_params);
60 : : }
61 : :
62 : 643 : return pos;
63 : : }
64 : :
65 : :
66 : 643 : u8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid)
67 : : {
68 : : struct ieee80211_ht_operation *oper;
69 : 643 : u8 *pos = eid;
70 : :
71 [ + + ][ - + ]: 643 : if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
72 : 1 : return eid;
73 : :
74 : 642 : *pos++ = WLAN_EID_HT_OPERATION;
75 : 642 : *pos++ = sizeof(*oper);
76 : :
77 : 642 : oper = (struct ieee80211_ht_operation *) pos;
78 : 642 : os_memset(oper, 0, sizeof(*oper));
79 : :
80 : 642 : oper->control_chan = hapd->iconf->channel;
81 : 642 : oper->operation_mode = host_to_le16(hapd->iface->ht_op_mode);
82 [ - + ]: 642 : if (hapd->iconf->secondary_channel == 1)
83 : 0 : oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE |
84 : : HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH;
85 [ - + ]: 642 : if (hapd->iconf->secondary_channel == -1)
86 : 0 : oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW |
87 : : HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH;
88 : :
89 : 642 : pos += sizeof(*oper);
90 : :
91 : 643 : 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 : 230 : int hostapd_ht_operation_update(struct hostapd_iface *iface)
107 : : {
108 : : u16 cur_op_mode, new_op_mode;
109 : 230 : int op_mode_changes = 0;
110 : :
111 [ + - ][ - + ]: 230 : if (!iface->conf->ieee80211n || iface->conf->ht_op_mode_fixed)
112 : 0 : return 0;
113 : :
114 : 230 : wpa_printf(MSG_DEBUG, "%s current operation mode=0x%X",
115 : 230 : __func__, iface->ht_op_mode);
116 : :
117 [ + - ]: 230 : if (!(iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT)
118 [ - + ]: 230 : && iface->num_sta_ht_no_gf) {
119 : 0 : iface->ht_op_mode |=
120 : : HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT;
121 : 0 : op_mode_changes++;
122 [ - + ]: 230 : } else if ((iface->ht_op_mode &
123 [ # # ]: 0 : HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT) &&
124 : 0 : iface->num_sta_ht_no_gf == 0) {
125 : 0 : iface->ht_op_mode &=
126 : : ~HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT;
127 : 0 : op_mode_changes++;
128 : : }
129 : :
130 [ + - ][ + - ]: 230 : if (!(iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT) &&
131 [ - + ]: 230 : (iface->num_sta_no_ht || iface->olbc_ht)) {
132 : 0 : iface->ht_op_mode |= HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT;
133 : 0 : op_mode_changes++;
134 [ - + ]: 230 : } else if ((iface->ht_op_mode &
135 [ # # ]: 0 : HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT) &&
136 [ # # ]: 0 : (iface->num_sta_no_ht == 0 && !iface->olbc_ht)) {
137 : 0 : iface->ht_op_mode &=
138 : : ~HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT;
139 : 0 : op_mode_changes++;
140 : : }
141 : :
142 : 230 : new_op_mode = 0;
143 [ - + ]: 230 : if (iface->num_sta_no_ht)
144 : 0 : new_op_mode = OP_MODE_MIXED;
145 [ - + ][ # # ]: 230 : else if (iface->conf->secondary_channel && iface->num_sta_ht_20mhz)
146 : 0 : new_op_mode = OP_MODE_20MHZ_HT_STA_ASSOCED;
147 [ - + ]: 230 : else if (iface->olbc_ht)
148 : 0 : new_op_mode = OP_MODE_MAY_BE_LEGACY_STAS;
149 : : else
150 : 230 : new_op_mode = OP_MODE_PURE;
151 : :
152 : 230 : cur_op_mode = iface->ht_op_mode & HT_INFO_OPERATION_MODE_OP_MODE_MASK;
153 [ - + ]: 230 : if (cur_op_mode != new_op_mode) {
154 : 0 : iface->ht_op_mode &= ~HT_INFO_OPERATION_MODE_OP_MODE_MASK;
155 : 0 : iface->ht_op_mode |= new_op_mode;
156 : 0 : op_mode_changes++;
157 : : }
158 : :
159 : 230 : wpa_printf(MSG_DEBUG, "%s new operation mode=0x%X changes=%d",
160 : 230 : __func__, iface->ht_op_mode, op_mode_changes);
161 : :
162 : 230 : return op_mode_changes;
163 : : }
164 : :
165 : :
166 : 117 : 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 [ + - ][ + - ]: 117 : if (!ht_capab ||
171 [ - + ]: 117 : ht_capab_len < sizeof(struct ieee80211_ht_capabilities) ||
172 : 117 : hapd->conf->disable_11n) {
173 : 0 : sta->flags &= ~WLAN_STA_HT;
174 : 0 : os_free(sta->ht_capabilities);
175 : 0 : sta->ht_capabilities = NULL;
176 : 0 : return WLAN_STATUS_SUCCESS;
177 : : }
178 : :
179 [ + + ]: 117 : if (sta->ht_capabilities == NULL) {
180 : 113 : sta->ht_capabilities =
181 : 113 : os_zalloc(sizeof(struct ieee80211_ht_capabilities));
182 [ - + ]: 113 : if (sta->ht_capabilities == NULL)
183 : 0 : return WLAN_STATUS_UNSPECIFIED_FAILURE;
184 : : }
185 : :
186 : 117 : sta->flags |= WLAN_STA_HT;
187 : 117 : os_memcpy(sta->ht_capabilities, ht_capab,
188 : : sizeof(struct ieee80211_ht_capabilities));
189 : :
190 : 117 : return WLAN_STATUS_SUCCESS;
191 : : }
192 : :
193 : :
194 : 117 : static void update_sta_ht(struct hostapd_data *hapd, struct sta_info *sta)
195 : : {
196 : : u16 ht_capab;
197 : :
198 : 117 : ht_capab = le_to_host16(sta->ht_capabilities->ht_capabilities_info);
199 : 117 : wpa_printf(MSG_DEBUG, "HT: STA " MACSTR " HT Capabilities Info: "
200 : 702 : "0x%04x", MAC2STR(sta->addr), ht_capab);
201 [ - + ]: 117 : if ((ht_capab & HT_CAP_INFO_GREEN_FIELD) == 0) {
202 [ # # ]: 0 : if (!sta->no_ht_gf_set) {
203 : 0 : sta->no_ht_gf_set = 1;
204 : 0 : hapd->iface->num_sta_ht_no_gf++;
205 : : }
206 : 0 : wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no greenfield, num "
207 : : "of non-gf stations %d",
208 : 0 : __func__, MAC2STR(sta->addr),
209 : 0 : hapd->iface->num_sta_ht_no_gf);
210 : : }
211 [ - + ]: 117 : if ((ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) == 0) {
212 [ # # ]: 0 : if (!sta->ht_20mhz_set) {
213 : 0 : sta->ht_20mhz_set = 1;
214 : 0 : hapd->iface->num_sta_ht_20mhz++;
215 : : }
216 : 0 : wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - 20 MHz HT, num of "
217 : : "20MHz HT STAs %d",
218 : 0 : __func__, MAC2STR(sta->addr),
219 : 0 : hapd->iface->num_sta_ht_20mhz);
220 : : }
221 : 117 : }
222 : :
223 : :
224 : 0 : static void update_sta_no_ht(struct hostapd_data *hapd, struct sta_info *sta)
225 : : {
226 [ # # ]: 0 : if (!sta->no_ht_set) {
227 : 0 : sta->no_ht_set = 1;
228 : 0 : hapd->iface->num_sta_no_ht++;
229 : : }
230 [ # # ]: 0 : if (hapd->iconf->ieee80211n) {
231 : 0 : wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no HT, num of "
232 : : "non-HT stations %d",
233 : 0 : __func__, MAC2STR(sta->addr),
234 : 0 : hapd->iface->num_sta_no_ht);
235 : : }
236 : 0 : }
237 : :
238 : :
239 : 117 : void update_ht_state(struct hostapd_data *hapd, struct sta_info *sta)
240 : : {
241 [ + - ][ + - ]: 117 : if ((sta->flags & WLAN_STA_HT) && sta->ht_capabilities)
242 : 117 : update_sta_ht(hapd, sta);
243 : : else
244 : 0 : update_sta_no_ht(hapd, sta);
245 : :
246 [ - + ]: 117 : if (hostapd_ht_operation_update(hapd->iface) > 0)
247 : 0 : ieee802_11_set_beacons(hapd->iface);
248 : 117 : }
249 : :
250 : :
251 : 117 : 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 [ - + ]: 117 : if (ht_cap == NULL)
258 : 117 : return;
259 : 117 : os_memcpy(neg_ht_cap, ht_cap, sizeof(*neg_ht_cap));
260 : 117 : 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 : 117 : 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 [ + - ]: 117 : if (!(hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK))
276 : 117 : cap &= ~HT_CAP_INFO_TX_STBC;
277 [ + - ]: 117 : if (!(hapd->iconf->ht_capab & HT_CAP_INFO_TX_STBC))
278 : 117 : cap &= ~HT_CAP_INFO_RX_STBC_MASK;
279 : :
280 : 117 : neg_ht_cap->ht_capabilities_info = host_to_le16(cap);
281 : : }
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