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AP MLD: Fix advertisement of MLD capabilities

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Previously, hostapd directly advertised the MLD capabilities received
from the driver. Since this information is exchanged during
initialization time only, the driver will advertise the maximum
supported values. hostapd should parse it and then based on the current
situation fill the values accordingly.

For example, the maximum number of simultaneous links is supposed to be
a value between 0 and 14, which is the number of affiliated APs minus 1.
The driver advertises this value as 5 and hostapd, irrespective of the
current active links, puts 5 in the frames.

Fix this by parsing the value from the driver capabilities and then
using the values as per the current situation of the links. The
advertised values will be used as the upper limit.

Signed-off-by: Aditya Kumar Singh <quic_adisi@quicinc.com>
This commit is contained in:
Aditya Kumar Singh 2024-03-06 12:09:58 +05:30 committed by Jouni Malinen
parent 7a0501d20d
commit 9fdbaf2ed6
1 changed files with 21 additions and 2 deletions
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23
src/ap/ieee802_11_eht.c
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@ -450,6 +450,8 @@ static u8 * hostapd_eid_eht_basic_ml_common(struct hostapd_data *hapd,
size_t len, slice_len;
u8 link_id;
u8 common_info_len;
u16 mld_cap;
u8 max_simul_links, active_links;
/*
* As the Multi-Link element can exceed the size of 255 bytes need to
@ -499,9 +501,26 @@ static u8 * hostapd_eid_eht_basic_ml_common(struct hostapd_data *hapd,
hapd->iface->mld_eml_capa);
wpabuf_put_le16(buf, hapd->iface->mld_eml_capa);
mld_cap = hapd->iface->mld_mld_capa;
max_simul_links = mld_cap & EHT_ML_MLD_CAPA_MAX_NUM_SIM_LINKS_MASK;
active_links = hapd->mld->num_links - 1;
if (active_links > max_simul_links) {
wpa_printf(MSG_ERROR,
"MLD: Error in max simultaneous links, advertised: 0x%x current: 0x%x",
max_simul_links, active_links);
active_links = max_simul_links;
}
mld_cap &= ~EHT_ML_MLD_CAPA_MAX_NUM_SIM_LINKS_MASK;
mld_cap |= active_links & EHT_ML_MLD_CAPA_MAX_NUM_SIM_LINKS_MASK;
/* TODO: Advertise T2LM based on driver support as well */
mld_cap &= ~EHT_ML_MLD_CAPA_TID_TO_LINK_MAP_NEG_SUPP_MSK;
wpa_printf(MSG_DEBUG, "MLD: MLD Capabilities and Operations=0x%x",
hapd->iface->mld_mld_capa);
wpabuf_put_le16(buf, hapd->iface->mld_mld_capa);
mld_cap);
wpabuf_put_le16(buf, mld_cap);
if (include_mld_id) {
wpa_printf(MSG_DEBUG, "MLD: AP MLD ID=0x%x",