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hostapd: Add Multi-AP protocol support

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The purpose of Multi-AP specification is to enable inter-operability
across Wi-Fi access points (APs) from different vendors.

This patch introduces one new configuration parameter 'multi_ap' to
enable Multi-AP functionality and to configure the BSS as a backhaul
and/or fronthaul BSS.

Advertise vendor specific Multi-AP capabilities in (Re)Association
Response frame, if Multi-AP functionality is enabled through the
configuration parameter.

A backhaul AP must support receiving both 3addr and 4addr frames from a
backhaul STA, so create a VLAN for it just like is done for WDS, i.e.,
by calling hostapd_set_wds_sta(). Since Multi-AP requires WPA2 (never
WEP), we can safely call hostapd_set_wds_encryption() as well and we can
reuse the entire WDS condition.

To parse the Multi-AP Extension subelement, we use get_ie(): even though
that function is meant for parsing IEs, it works for subelements.

Signed-off-by: Venkateswara Naralasetty <vnaralas@codeaurora.org>
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
This commit is contained in:
Venkateswara Naralasetty 2018-12-05 11:23:51 +01:00 • committed by Jouni Malinen
parent 3006241e43
commit 9c06f0f6ae
9 changed files with 134 additions and 2 deletions
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24
src/common/ieee802_11_common.c
View file

@ -126,6 +126,10 @@ static int ieee802_11_parse_vendor_specific(const u8 *pos, size_t elen,
elems->roaming_cons_sel = pos;
elems->roaming_cons_sel_len = elen;
break;
case MULTI_AP_OUI_TYPE:
elems->multi_ap = pos;
elems->multi_ap_len = elen;
break;
default:
wpa_printf(MSG_MSGDUMP, "Unknown WFA "
"information element ignored "
@ -1558,6 +1562,26 @@ size_t mbo_add_ie(u8 *buf, size_t len, const u8 *attr, size_t attr_len)
}
size_t add_multi_ap_ie(u8 *buf, size_t len, u8 value)
{
u8 *pos = buf;
if (len < 9)
return 0;
*pos++ = WLAN_EID_VENDOR_SPECIFIC;
*pos++ = 7; /* len */
WPA_PUT_BE24(pos, OUI_WFA);
pos += 3;
*pos++ = MULTI_AP_OUI_TYPE;
*pos++ = MULTI_AP_SUB_ELEM_TYPE;
*pos++ = 1; /* len */
*pos++ = value;
return pos - buf;
}
static const struct country_op_class us_op_class[] = {
{ 1, 115 },
{ 2, 118 },

4
src/common/ieee802_11_common.h
View file

@ -86,6 +86,7 @@ struct ieee802_11_elems {
const u8 *roaming_cons_sel;
const u8 *password_id;
const u8 *oci;
const u8 *multi_ap;
u8 ssid_len;
u8 supp_rates_len;
@ -133,6 +134,7 @@ struct ieee802_11_elems {
u8 roaming_cons_sel_len;
u8 password_id_len;
u8 oci_len;
u8 multi_ap_len;
struct mb_ies_info mb_ies;
};
@ -194,6 +196,8 @@ const u8 * get_ie_ext(const u8 *ies, size_t len, u8 ext);
size_t mbo_add_ie(u8 *buf, size_t len, const u8 *attr, size_t attr_len);
size_t add_multi_ap_ie(u8 *buf, size_t len, u8 value);
struct country_op_class {
u8 country_op_class;
u8 global_op_class;

7
src/common/ieee802_11_defs.h
View file

@ -1213,6 +1213,13 @@ struct ieee80211_ampe_ie {
#define MBO_OUI_TYPE 22
#define OWE_IE_VENDOR_TYPE 0x506f9a1c
#define OWE_OUI_TYPE 28
#define MULTI_AP_OUI_TYPE 0x1B
#define MULTI_AP_SUB_ELEM_TYPE 0x06
#define MULTI_AP_TEAR_DOWN BIT(4)
#define MULTI_AP_FRONTHAUL_BSS BIT(5)
#define MULTI_AP_BACKHAUL_BSS BIT(6)
#define MULTI_AP_BACKHAUL_STA BIT(7)
#define WMM_OUI_TYPE 2
#define WMM_OUI_SUBTYPE_INFORMATION_ELEMENT 0