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wlantest: Initial support for Multiple BSSID procedure

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Parse the Multiple BSSID element in Beacon frames and create and update
all the nontransmitted BSSs.

Signed-off-by: Jouni Malinen <quic_jouni@quicinc.com>
This commit is contained in:
Jouni Malinen 2024-06-10 21:27:00 +03:00 committed by Jouni Malinen
parent 1b96745f1d
commit 2829f1c439
3 changed files with 117 additions and 0 deletions
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6
src/common/ieee802_11_common.c
View file

@ -607,6 +607,12 @@ static ParseRes __ieee802_11_parse_elems(const u8 *start, size_t len,
elems->rrm_enabled = pos;
elems->rrm_enabled_len = elen;
break;
case WLAN_EID_MULTIPLE_BSSID:
if (elen < 1)
break;
elems->mbssid = pos;
elems->mbssid_len = elen;
break;
case WLAN_EID_CAG_NUMBER:
elems->cag_number = pos;
elems->cag_number_len = elen;

2
src/common/ieee802_11_common.h
View file

@ -115,6 +115,7 @@ struct ieee802_11_elems {
const u8 *tdls_mle;
const u8 *prior_access_mle;
const u8 *mbssid_known_bss;
const u8 *mbssid;
u8 ssid_len;
u8 supp_rates_len;
@ -177,6 +178,7 @@ struct ieee802_11_elems {
size_t tdls_mle_len;
size_t prior_access_mle_len;
u8 mbssid_known_bss_len;
u8 mbssid_len;
struct mb_ies_info mb_ies;

109
wlantest/rx_mgmt.c
View file

@ -439,6 +439,115 @@ static void rx_mgmt_beacon(struct wlantest *wt, const u8 *data, size_t len)
if (!bss->proberesp_seen)
bss_update(wt, bss, &elems, 1);
if (elems.mbssid) {
const u8 *pos = elems.mbssid;
const u8 *end = elems.mbssid + elems.mbssid_len;
u8 max_bss = *pos++;
while (end - pos > 2) {
u8 s_id, s_len, ssid_len, bssid_idx;
const u8 *s_data, *ssid;
u16 capa;
u8 bssid[ETH_ALEN], b;
struct ieee802_11_elems m_elems, merged;
struct wlantest_bss *m_bss;
s_id = *pos++;
s_len = *pos++;
if (end - pos < s_len)
break;
s_data = pos;
pos += s_len;
if (s_id !=
WLAN_MBSSID_SUBELEMENT_NONTRANSMITTED_BSSID_PROFILE)
continue;
/* Nontransmitted BSSID Capability element */
if (pos - s_data < 4 ||
s_data[0] != WLAN_EID_NONTRANSMITTED_BSSID_CAPA ||
s_data[1] < 2)
continue;
capa = WPA_GET_LE16(&s_data[2]);
s_data += 2 + s_data[1];
/* SSID element */
if (pos - s_data < 2 ||
s_data[0] != WLAN_EID_SSID)
continue;
ssid = &s_data[2];
ssid_len = s_data[1];
s_data += 2 + s_data[1];
/* Multiple BSSID-Index element */
if (pos - s_data < 3 ||
s_data[0] != WLAN_EID_MULTIPLE_BSSID_INDEX)
continue;
bssid_idx = s_data[2];
s_data += 2 + s_data[1];
if (max_bss < 1 || max_bss > 8)
break;
os_memcpy(bssid, mgmt->bssid, ETH_ALEN);
b = bssid[5] % (1 << max_bss);
bssid[5] = bssid[5] - b +
(b + bssid_idx) % (1 << max_bss);
wpa_printf(MSG_MSGDUMP, "MBSSID: " MACSTR
" Capa 0x%x idx=%u MaxBSSID Indicator=%u",
MAC2STR(bssid), capa, bssid_idx, max_bss);
wpa_hexdump(MSG_MSGDUMP, "MBSSID: SSID",
ssid, ssid_len);
/* Rest of the elements */
wpa_hexdump(MSG_MSGDUMP, "MBSSID: Elements",
s_data, pos - s_data);
if (ieee802_11_parse_elems(s_data, pos - s_data,
&m_elems,
0) == ParseFailed) {
wpa_printf(MSG_DEBUG,
"MBSSID: Failed to parse nontransmitted BSS elements");
continue;
}
/* TODO: Noninheritance and rest of elements */
os_memcpy(&merged, &elems, sizeof(merged));
merged.ssid = ssid;
merged.ssid_len = ssid_len;
m_bss = bss_get(wt, bssid);
if (!m_bss)
continue;
if (!m_bss->proberesp_seen)
m_bss->capab_info = capa;
if (m_elems.basic_mle) {
merged.basic_mle = m_elems.basic_mle;
merged.basic_mle_len = m_elems.basic_mle_len;
}
if (m_elems.rsn_ie) {
merged.rsn_ie = m_elems.rsn_ie;
merged.rsn_ie_len = m_elems.rsn_ie_len;
}
if (m_elems.rsnxe) {
merged.rsnxe = m_elems.rsnxe;
merged.rsnxe_len = m_elems.rsnxe_len;
}
if (merged.rsnxe) {
os_memcpy(m_bss->rsnxe, merged.rsnxe,
merged.rsnxe_len);
m_bss->rsnxe_len = merged.rsnxe_len;
} else {
m_bss->rsnxe_len = 0;
}
if (!m_bss->proberesp_seen)
bss_update(wt, m_bss, &merged, 1);
}
}
mme = get_ie(mgmt->u.beacon.variable, len - offset, WLAN_EID_MMIE);
if (!mme) {
if (bss->bigtk_idx) {