ieee802_11_vht.c revision 7a5e50a0554bee77a9da492ea3d86f46147f1671 
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 "drivers/driver.h"
16#include "hostapd.h"
17#include "ap_config.h"
18#include "sta_info.h"
19#include "beacon.h"
20#include "ieee802_11.h"
21
22
23u8 * hostapd_eid_vht_capabilities(struct hostapd_data *hapd, u8 *eid)
24{
25	struct ieee80211_vht_capabilities *cap;
26	u8 *pos = eid;
27
28	if (!hapd->iconf->ieee80211ac || !hapd->iface->current_mode ||
29	    hapd->conf->disable_11ac)
30		return eid;
31
32	*pos++ = WLAN_EID_VHT_CAP;
33	*pos++ = sizeof(*cap);
34
35	cap = (struct ieee80211_vht_capabilities *) pos;
36	os_memset(cap, 0, sizeof(*cap));
37	cap->vht_capabilities_info = host_to_le32(
38		hapd->iface->current_mode->vht_capab);
39
40	/* Supported MCS set comes from hw */
41	os_memcpy(&cap->vht_supported_mcs_set,
42	          hapd->iface->current_mode->vht_mcs_set, 8);
43
44	pos += sizeof(*cap);
45
46	return pos;
47}
48
49
50u8 * hostapd_eid_vht_operation(struct hostapd_data *hapd, u8 *eid)
51{
52	struct ieee80211_vht_operation *oper;
53	u8 *pos = eid;
54
55	if (!hapd->iconf->ieee80211ac || hapd->conf->disable_11ac)
56		return eid;
57
58	*pos++ = WLAN_EID_VHT_OPERATION;
59	*pos++ = sizeof(*oper);
60
61	oper = (struct ieee80211_vht_operation *) pos;
62	os_memset(oper, 0, sizeof(*oper));
63
64	/*
65	 * center freq = 5 GHz + (5 * index)
66	 * So index 42 gives center freq 5.210 GHz
67	 * which is channel 42 in 5G band
68	 */
69	oper->vht_op_info_chan_center_freq_seg0_idx =
70		hapd->iconf->vht_oper_centr_freq_seg0_idx;
71	oper->vht_op_info_chan_center_freq_seg1_idx =
72		hapd->iconf->vht_oper_centr_freq_seg1_idx;
73
74	oper->vht_op_info_chwidth = hapd->iconf->vht_oper_chwidth;
75
76	/* VHT Basic MCS set comes from hw */
77	/* Hard code 1 stream, MCS0-7 is a min Basic VHT MCS rates */
78	oper->vht_basic_mcs_set = host_to_le16(0xfffc);
79	pos += sizeof(*oper);
80
81	return pos;
82}
83
84
85u16 copy_sta_vht_capab(struct hostapd_data *hapd, struct sta_info *sta,
86		       const u8 *vht_capab, size_t vht_capab_len)
87{
88	/* Disable VHT caps for STAs associated to no-VHT BSSes. */
89	if (!vht_capab ||
90	    vht_capab_len < sizeof(struct ieee80211_vht_capabilities) ||
91	    hapd->conf->disable_11ac) {
92		sta->flags &= ~WLAN_STA_VHT;
93		os_free(sta->vht_capabilities);
94		sta->vht_capabilities = NULL;
95		return WLAN_STATUS_SUCCESS;
96	}
97
98	if (sta->vht_capabilities == NULL) {
99		sta->vht_capabilities =
100			os_zalloc(sizeof(struct ieee80211_vht_capabilities));
101		if (sta->vht_capabilities == NULL)
102			return WLAN_STATUS_UNSPECIFIED_FAILURE;
103	}
104
105	sta->flags |= WLAN_STA_VHT;
106	os_memcpy(sta->vht_capabilities, vht_capab,
107		  sizeof(struct ieee80211_vht_capabilities));
108
109	return WLAN_STATUS_SUCCESS;
110}
111
112void hostapd_get_vht_capab(struct hostapd_data *hapd,
113			   struct ieee80211_vht_capabilities *vht_cap,
114			   struct ieee80211_vht_capabilities *neg_vht_cap)
115{
116	if (vht_cap == NULL)
117		return;
118	os_memcpy(neg_vht_cap, vht_cap, sizeof(*neg_vht_cap));
119
120	/* TODO: mask own capabilities, like get_ht_capab() */
121}
122