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MBO: Send MBO WNM-Notification Request frames to notify changes

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Send a WNM-Notification Request frame with Non-preferred Channel Report
subelement if the non-preferred channels list changes during an
association.

Signed-off-by: David Spinadel <david.spinadel@intel.com>
This commit is contained in:
David Spinadel 2016-02-15 16:53:25 +02:00 committed by Jouni Malinen
parent 92c6e2e3a9
commit 2d5b8614b7
2 changed files with 76 additions and 5 deletions
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80
wpa_supplicant/mbo.c
View file

@ -68,15 +68,40 @@ static void wpas_mbo_non_pref_chan_attr(struct wpa_supplicant *wpa_s,
}
static void wpas_mbo_non_pref_chan_attrs(struct wpa_supplicant *wpa_s,
struct wpabuf *mbo)
static void wpas_mbo_non_pref_chan_subelem_hdr(struct wpabuf *mbo, u8 len)
{
wpabuf_put_u8(mbo, WLAN_EID_VENDOR_SPECIFIC);
wpabuf_put_u8(mbo, len); /* Length */
wpabuf_put_be24(mbo, OUI_WFA);
wpabuf_put_u8(mbo, MBO_ATTR_ID_NON_PREF_CHAN_REPORT);
}
static void wpas_mbo_non_pref_chan_subelement(struct wpa_supplicant *wpa_s,
struct wpabuf *mbo, u8 start,
u8 end)
{
size_t size = end - start + 8;
if (size + 2 > wpabuf_tailroom(mbo))
return;
wpas_mbo_non_pref_chan_subelem_hdr(mbo, size);
wpas_mbo_non_pref_chan_attr_body(wpa_s, mbo, start, end);
}
static void wpas_mbo_non_pref_chan_attrs(struct wpa_supplicant *wpa_s,
struct wpabuf *mbo, int subelement)
{
u8 i, start = 0;
struct wpa_mbo_non_pref_channel *start_pref;
if (!wpa_s->non_pref_chan || !wpa_s->non_pref_chan_num)
if (!wpa_s->non_pref_chan || !wpa_s->non_pref_chan_num) {
if (subelement)
wpas_mbo_non_pref_chan_subelem_hdr(mbo, 4);
return;
}
start_pref = &wpa_s->non_pref_chan[0];
for (i = 1; i <= wpa_s->non_pref_chan_num; i++) {
@ -89,7 +114,12 @@ static void wpas_mbo_non_pref_chan_attrs(struct wpa_supplicant *wpa_s,
non_pref->reason != start_pref->reason ||
non_pref->reason_detail != start_pref->reason_detail ||
non_pref->preference != start_pref->preference) {
wpas_mbo_non_pref_chan_attr(wpa_s, mbo, start, i);
if (subelement)
wpas_mbo_non_pref_chan_subelement(wpa_s, mbo,
start, i);
else
wpas_mbo_non_pref_chan_attr(wpa_s, mbo, start,
i);
if (!non_pref)
return;
@ -116,7 +146,7 @@ int wpas_mbo_ie(struct wpa_supplicant *wpa_s, u8 *buf, size_t len)
return 0;
/* Add non-preferred channels attribute */
wpas_mbo_non_pref_chan_attrs(wpa_s, mbo);
wpas_mbo_non_pref_chan_attrs(wpa_s, mbo, 0);
res = mbo_add_ie(buf, len, wpabuf_head_u8(mbo), wpabuf_len(mbo));
if (!res)
@ -127,6 +157,45 @@ int wpas_mbo_ie(struct wpa_supplicant *wpa_s, u8 *buf, size_t len)
}
static void wpas_mbo_send_wnm_notification(struct wpa_supplicant *wpa_s)
{
struct wpabuf *buf;
int res;
/*
* Send WNM-Notification Request frame only in case of a change in
* non-preferred channels list during association, if the AP supports
* MBO.
*/
if (wpa_s->wpa_state != WPA_COMPLETED || !wpa_s->current_bss ||
!wpa_bss_get_vendor_ie(wpa_s->current_bss, MBO_IE_VENDOR_TYPE))
return;
buf = wpabuf_alloc(512);
if (!buf)
return;
wpabuf_put_u8(buf, WLAN_ACTION_WNM);
wpabuf_put_u8(buf, WNM_NOTIFICATION_REQ);
wpa_s->mbo_wnm_token++;
if (wpa_s->mbo_wnm_token == 0)
wpa_s->mbo_wnm_token++;
wpabuf_put_u8(buf, wpa_s->mbo_wnm_token);
wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC); /* Type */
wpas_mbo_non_pref_chan_attrs(wpa_s, buf, 1);
res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
wpa_s->own_addr, wpa_s->bssid,
wpabuf_head(buf), wpabuf_len(buf), 0);
if (res < 0)
wpa_printf(MSG_DEBUG,
"Failed to send WNM-Notification Request frame with non-preferred channel list");
wpabuf_free(buf);
}
static int wpa_non_pref_chan_is_eq(struct wpa_mbo_non_pref_channel *a,
struct wpa_mbo_non_pref_channel *b)
{
@ -252,6 +321,7 @@ update:
os_free(wpa_s->non_pref_chan);
wpa_s->non_pref_chan = chans;
wpa_s->non_pref_chan_num = num;
wpas_mbo_send_wnm_notification(wpa_s);
return 0;

1
wpa_supplicant/wpa_supplicant_i.h
View file

@ -1027,6 +1027,7 @@ struct wpa_supplicant {
u8 preference;
} *non_pref_chan;
size_t non_pref_chan_num;
u8 mbo_wnm_token;
#endif /* CONFIG_MBO */
};