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wiphy: add getter for HT capabilities

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This adds some additional parsing to obtain the AMPDU parameter
byte as well as wiphy_get_ht_capabilities() which returns the
complete IE (combining the 3 separate kernel attributes).
This commit is contained in:
James Prestwood 2022-12-20 13:43:12 -08:00 committed by Denis Kenzior
parent d87ba1f486
commit 9e01563e8c
2 changed files with 56 additions and 0 deletions
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53
src/wiphy.c
View File

@ -910,6 +910,42 @@ bool wiphy_country_is_unknown(struct wiphy *wiphy)
(cc[0] == 'X' && cc[1] == 'X'));
}
const uint8_t *wiphy_get_ht_capabilities(const struct wiphy *wiphy,
enum band_freq band,
size_t *size)
{
static uint8_t ht_capa[26];
const struct band *bandp = wiphy_get_band(wiphy, band);
if (!bandp)
return NULL;
if (!bandp->ht_supported)
return NULL;
memset(ht_capa, 0, sizeof(ht_capa));
/*
* The kernel segments the HT capabilities element into multiple
* attributes. For convenience on the caller just combine them and
* return the full IE rather than adding 3 separate getters. This also
* provides a way to check if HT is supported.
*/
memcpy(ht_capa, bandp->ht_capabilities, 2);
ht_capa[2] = bandp->ht_ampdu_params;
memcpy(ht_capa + 3, bandp->ht_mcs_set, 16);
/*
* TODO: HT Extended capabilities, beamforming, and ASEL capabilities
* are not available to get from the kernel, leave as zero.
*/
if (size)
*size = sizeof(ht_capa);
return ht_capa;
}
int wiphy_estimate_data_rate(struct wiphy *wiphy,
const void *ies, uint16_t ies_len,
const struct scan_bss *bss,
@ -1617,6 +1653,23 @@ static void parse_supported_bands(struct wiphy *wiphy,
memcpy(band->ht_capabilities, data, len);
band->ht_supported = true;
break;
/*
* AMPDU factor/density are part of A-MPDU Parameters,
* 802.11-2020 Section 9.4.2.55.3.
*/
case NL80211_BAND_ATTR_HT_AMPDU_FACTOR:
if (L_WARN_ON(len != 1))
continue;
band->ht_ampdu_params |= l_get_u8(data) & 0x3;
break;
case NL80211_BAND_ATTR_HT_AMPDU_DENSITY:
if (L_WARN_ON(len != 1))
continue;
band->ht_ampdu_params |=
(l_get_u8(data) & 0x7) << 2;
break;
case NL80211_BAND_ATTR_IFTYPE_DATA:
if (!l_genl_attr_recurse(&attr, &nested))
continue;

3
src/wiphy.h
View File

@ -138,6 +138,9 @@ bool wiphy_get_rsnxe(const struct wiphy *wiphy, uint8_t *buf, size_t len);
void wiphy_get_reg_domain_country(struct wiphy *wiphy, char *out);
bool wiphy_country_is_unknown(struct wiphy *wiphy);
const uint8_t *wiphy_get_ht_capabilities(const struct wiphy *wiphy,
enum band_freq band,
size_t *size);
void wiphy_generate_random_address(struct wiphy *wiphy, uint8_t addr[static 6]);
void wiphy_generate_address_from_ssid(struct wiphy *wiphy, const char *ssid,
uint8_t addr[static 6]);