[PATCH 12/26] MBO: Add supported operating classes element to association request
Ilan Peer
ilan.peer at intel.com
Mon Feb 15 06:53:35 PST 2016
From: Avraham Stern <avraham.stern at intel.com>
Signed-off-by: Avraham Stern <avraham.stern at intel.com>
---
wpa_supplicant/mbo.c | 263 ++++++++++++++++++++++++++++++++++++++
wpa_supplicant/sme.c | 36 ++++--
wpa_supplicant/wpa_supplicant.c | 31 +++--
wpa_supplicant/wpa_supplicant_i.h | 2 +
4 files changed, 313 insertions(+), 19 deletions(-)
diff --git a/wpa_supplicant/mbo.c b/wpa_supplicant/mbo.c
index 10954e8..43e7033 100644
--- a/wpa_supplicant/mbo.c
+++ b/wpa_supplicant/mbo.c
@@ -355,3 +355,266 @@ void wpas_mbo_scan_ie(struct wpa_supplicant *wpa_s, struct wpabuf *ie)
wpabuf_put_u8(ie, 1);
wpabuf_put_u8(ie, wpa_s->conf->mbo_cell_capa);
}
+
+
+enum chan_allowed {
+ NOT_ALLOWED, ALLOWED,
+};
+
+static int allow_channel(struct hostapd_hw_modes *mode, u8 chan,
+ unsigned int *flags)
+{
+ int i;
+
+ for (i = 0; i < mode->num_channels; i++) {
+ if (mode->channels[i].chan == chan)
+ break;
+ }
+
+ if (i == mode->num_channels ||
+ (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED))
+ return NOT_ALLOWED;
+
+ if (flags)
+ *flags = mode->channels[i].flag;
+
+ return ALLOWED;
+}
+
+
+static int get_center_80mhz(struct hostapd_hw_modes *mode, u8 channel)
+{
+ u8 center_channels[] = {42, 58, 106, 122, 138, 155};
+ size_t i;
+
+ if (mode->mode != HOSTAPD_MODE_IEEE80211A)
+ return 0;
+
+ for (i = 0; i < ARRAY_SIZE(center_channels); i++) {
+ /*
+ * In 80 MHz, the bandwidth "spans" 12 channels (e.g., 36-48),
+ * so the center channel is 6 channels away from the start/end.
+ */
+ if (channel >= center_channels[i] - 6 &&
+ channel <= center_channels[i] + 6)
+ return center_channels[i];
+ }
+
+ return 0;
+}
+
+
+static enum chan_allowed verify_80mhz(struct hostapd_hw_modes *mode, u8 channel)
+{
+ u8 center_chan;
+ unsigned int i;
+
+ center_chan = get_center_80mhz(mode, channel);
+ if (!center_chan)
+ return NOT_ALLOWED;
+
+ /* check all the channels are available */
+ for (i = 0; i < 4; i++) {
+ unsigned int flags;
+ u8 adj_chan = center_chan - 6 + i * 4;
+
+ if (allow_channel(mode, adj_chan, &flags) == NOT_ALLOWED)
+ return NOT_ALLOWED;
+
+ if (i == 0 && !(flags & HOSTAPD_CHAN_VHT_10_70))
+ return NOT_ALLOWED;
+ if (i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_50))
+ return NOT_ALLOWED;
+ if (i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_30))
+ return NOT_ALLOWED;
+ if (i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_10))
+ return NOT_ALLOWED;
+ }
+
+ return ALLOWED;
+}
+
+
+static int get_center_160mhz(struct hostapd_hw_modes *mode, u8 channel)
+{
+ u8 center_channels[] = { 50, 114 };
+ unsigned int i;
+
+ if (mode->mode != HOSTAPD_MODE_IEEE80211A)
+ return 0;
+
+ for (i = 0; i < ARRAY_SIZE(center_channels); i++) {
+ /*
+ * In 160 MHz, the bandwidth "spans" 28 channels (e.g., 36-64),
+ * so the center channel is 14 channels away from the start/end.
+ */
+ if (channel >= center_channels[i] - 14 &&
+ channel <= center_channels[i] + 14)
+ return center_channels[i];
+ }
+
+ return 0;
+}
+
+
+static enum chan_allowed verify_160mhz(struct hostapd_hw_modes *mode,
+ u8 channel)
+{
+ u8 center_chan;
+ unsigned int i;
+
+ center_chan = get_center_160mhz(mode, channel);
+ if (!center_chan)
+ return NOT_ALLOWED;
+
+ /* Check all the channels are available */
+ for (i = 0; i < 8; i++) {
+ unsigned int flags;
+ u8 adj_chan = center_chan - 14 + i * 4;
+
+ if (allow_channel(mode, adj_chan, &flags) == NOT_ALLOWED)
+ return NOT_ALLOWED;
+
+ if (i == 0 && !(flags & HOSTAPD_CHAN_VHT_10_150))
+ return NOT_ALLOWED;
+ if (i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_130))
+ return NOT_ALLOWED;
+ if (i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_110))
+ return NOT_ALLOWED;
+ if (i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_90))
+ return NOT_ALLOWED;
+ if (i == 4 && !(flags & HOSTAPD_CHAN_VHT_90_70))
+ return NOT_ALLOWED;
+ if (i == 5 && !(flags & HOSTAPD_CHAN_VHT_110_50))
+ return NOT_ALLOWED;
+ if (i == 6 && !(flags & HOSTAPD_CHAN_VHT_130_30))
+ return NOT_ALLOWED;
+ if (i == 7 && !(flags & HOSTAPD_CHAN_VHT_150_10))
+ return NOT_ALLOWED;
+ }
+
+ return ALLOWED;
+}
+
+
+enum chan_allowed verify_channel(struct hostapd_hw_modes *mode, u8 channel,
+ u8 bw)
+{
+ unsigned int flag = 0;
+ enum chan_allowed res, res2;
+
+ res2 = res = allow_channel(mode, channel, &flag);
+ if (bw == BW40MINUS) {
+ if (!(flag & HOSTAPD_CHAN_HT40MINUS))
+ return NOT_ALLOWED;
+ res2 = allow_channel(mode, channel - 4, NULL);
+ } else if (bw == BW40PLUS) {
+ if (!(flag & HOSTAPD_CHAN_HT40PLUS))
+ return NOT_ALLOWED;
+ res2 = allow_channel(mode, channel + 4, NULL);
+ } else if (bw == BW80) {
+ res2 = verify_80mhz(mode, channel);
+ } else if (bw == BW160) {
+ res2 = verify_160mhz(mode, channel);
+ }
+
+ if (res == NOT_ALLOWED || res2 == NOT_ALLOWED)
+ return NOT_ALLOWED;
+
+ return ALLOWED;
+}
+
+
+static int wpas_op_class_supported(struct wpa_supplicant *wpa_s,
+ const struct oper_class_map *op_class)
+{
+ int chan;
+ size_t i;
+ struct hostapd_hw_modes *mode = get_mode(wpa_s->hw.modes,
+ wpa_s->hw.num_modes,
+ op_class->mode);
+
+ if (!mode)
+ return 0;
+
+ if (op_class->op_class == 128 || op_class->op_class == 130) {
+ u8 channels[] = {42, 58, 106, 122, 138, 155};
+
+ for (i = 0; i < ARRAY_SIZE(channels); i++) {
+ if (verify_channel(mode, channels[i], op_class->bw) ==
+ NOT_ALLOWED)
+ return 0;
+ }
+
+ return 1;
+ }
+
+ if (op_class->op_class == 129) {
+ if (verify_channel(mode, 50, op_class->bw) == NOT_ALLOWED ||
+ verify_channel(mode, 114, op_class->bw) == NOT_ALLOWED)
+ return 0;
+
+ return 1;
+ }
+
+ for (chan = op_class->min_chan; chan <= op_class->max_chan;
+ chan += op_class->inc) {
+ if (verify_channel(mode, chan, op_class->bw) == NOT_ALLOWED)
+ return 0;
+ }
+
+ return 1;
+}
+
+
+int wpas_mbo_supp_op_class_ie(struct wpa_supplicant *wpa_s, int freq, u8 *pos,
+ size_t len)
+{
+ struct wpabuf *buf;
+ u8 op, current, chan;
+ u8 *ie_len;
+ int res;
+
+ /*
+ * Assume 20MHz channel for now.
+ * TODO: Use the secondary channel and VHT channel width that will be
+ * used after association.
+ */
+ if (ieee80211_freq_to_channel_ext(freq, 0, VHT_CHANWIDTH_USE_HT,
+ ¤t, &chan) == NUM_HOSTAPD_MODES)
+ return 0;
+
+ /* need 3 bytes for EID, length and current op class + 1 byte for every
+ * other supported operating class */
+ buf = wpabuf_alloc(op_class_size + 3);
+ if (!buf)
+ return 0;
+
+ wpabuf_put_u8(buf, WLAN_EID_SUPPORTED_OPERATING_CLASSES);
+
+ /* will set the length later, putting a placeholder */
+ ie_len = wpabuf_mhead_u8(buf) + wpabuf_len(buf);
+ wpabuf_put_u8(buf, 0);
+ wpabuf_put_u8(buf, current);
+
+ for (op = 0; op_class[op].op_class; op++) {
+ if (wpas_op_class_supported(wpa_s, &op_class[op]))
+ wpabuf_put_u8(buf, op_class[op].op_class);
+ }
+
+ *ie_len = wpabuf_len(buf) - 2;
+ if (*ie_len < 2 || wpabuf_len(buf) > len) {
+ wpa_printf(MSG_ERROR,
+ "Failed to add supported operating classes IE");
+ res = 0;
+ } else {
+ os_memcpy(pos, wpabuf_head(buf), wpabuf_len(buf));
+ res = wpabuf_len(buf);
+ wpa_hexdump(MSG_DEBUG,
+ "MBO: Added supported operating classes IE",
+ wpabuf_head(buf), wpabuf_len(buf));
+ }
+
+ wpabuf_free(buf);
+ return res;
+}
diff --git a/wpa_supplicant/sme.c b/wpa_supplicant/sme.c
index b37c20a..b19776c 100644
--- a/wpa_supplicant/sme.c
+++ b/wpa_supplicant/sme.c
@@ -208,6 +208,9 @@ static void sme_send_authentication(struct wpa_supplicant *wpa_s,
u8 ext_capab[18];
int ext_capab_len;
int skip_auth;
+#ifdef CONFIG_MBO
+ const u8 *mbo;
+#endif
if (bss == NULL) {
wpa_msg(wpa_s, MSG_ERROR, "SME: No scan result available for "
@@ -453,6 +456,21 @@ static void sme_send_authentication(struct wpa_supplicant *wpa_s,
}
#endif /* CONFIG_FST */
+#ifdef CONFIG_MBO
+ mbo = wpa_bss_get_vendor_ie_subtype(bss, OUI_WFA, MBO_OUI_TYPE);
+ if (mbo) {
+ int len;
+
+ len = wpas_mbo_supp_op_class_ie(wpa_s, bss->freq,
+ wpa_s->sme.assoc_req_ie +
+ wpa_s->sme.assoc_req_ie_len,
+ sizeof(wpa_s->sme.assoc_req_ie) -
+ wpa_s->sme.assoc_req_ie_len);
+ if (len > 0)
+ wpa_s->sme.assoc_req_ie_len += len;
+ }
+#endif
+
ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
sizeof(ext_capab));
if (ext_capab_len > 0) {
@@ -483,17 +501,15 @@ static void sme_send_authentication(struct wpa_supplicant *wpa_s,
sme_auth_handle_rrm(wpa_s, bss);
#ifdef CONFIG_MBO
- if (wpa_bss_get_vendor_ie_subtype(bss, OUI_WFA, MBO_OUI_TYPE)) {
- u8 *pos;
- size_t len;
- int res;
+ if (mbo) {
+ int len;
- pos = wpa_s->sme.assoc_req_ie + wpa_s->sme.assoc_req_ie_len;
- len = sizeof(wpa_s->sme.assoc_req_ie) -
- wpa_s->sme.assoc_req_ie_len;
- res = wpas_mbo_ie(wpa_s, pos, len);
- if (res >= 0)
- wpa_s->sme.assoc_req_ie_len += res;
+ len = wpas_mbo_ie(wpa_s, wpa_s->sme.assoc_req_ie +
+ wpa_s->sme.assoc_req_ie_len,
+ sizeof(wpa_s->sme.assoc_req_ie) -
+ wpa_s->sme.assoc_req_ie_len);
+ if (len >= 0)
+ wpa_s->sme.assoc_req_ie_len += len;
}
#endif /* CONFIG_MBO */
diff --git a/wpa_supplicant/wpa_supplicant.c b/wpa_supplicant/wpa_supplicant.c
index dc7a586..d1c5723 100644
--- a/wpa_supplicant/wpa_supplicant.c
+++ b/wpa_supplicant/wpa_supplicant.c
@@ -2049,6 +2049,9 @@ static void wpas_start_assoc_cb(struct wpa_radio_work *work, int deinit)
struct ieee80211_vht_capabilities vhtcaps;
struct ieee80211_vht_capabilities vhtcaps_mask;
#endif /* CONFIG_VHT_OVERRIDES */
+#ifdef CONFIG_MBO
+ const u8 *mbo = NULL;
+#endif
if (deinit) {
if (work->started) {
@@ -2253,6 +2256,19 @@ static void wpas_start_assoc_cb(struct wpa_radio_work *work, int deinit)
}
#endif /* CONFIG_HS20 */
+#ifdef CONFIG_MBO
+ if (bss) {
+ mbo = wpa_bss_get_vendor_ie_subtype(bss, OUI_WFA, MBO_OUI_TYPE);
+ if (mbo) {
+ int len = wpas_mbo_supp_op_class_ie(wpa_s, bss->freq,
+ wpa_ie + wpa_ie_len,
+ sizeof(wpa_ie) - wpa_ie_len);
+ if (len > 0)
+ wpa_ie_len += len;
+ }
+ }
+#endif /* CONFIG_MBO */
+
/*
* Workaround: Add Extended Capabilities element only if the AP
* included this element in Beacon/Probe Response frames. Some older
@@ -2302,16 +2318,13 @@ static void wpas_start_assoc_cb(struct wpa_radio_work *work, int deinit)
#endif /* CONFIG_FST */
#ifdef CONFIG_MBO
- if (wpa_bss_get_vendor_ie_subtype(bss, OUI_WFA, MBO_OUI_TYPE)) {
- u8 *pos;
- size_t len;
- int res;
+ if (mbo) {
+ int len;
- pos = wpa_ie + wpa_ie_len;
- len = sizeof(wpa_ie) - wpa_ie_len;
- res = wpas_mbo_ie(wpa_s, pos, len);
- if (res >= 0)
- wpa_ie_len += res;
+ len = wpas_mbo_ie(wpa_s, wpa_ie + wpa_ie_len,
+ sizeof(wpa_ie) - wpa_ie_len);
+ if (len >= 0)
+ wpa_ie_len += len;
}
#endif /* CONFIG_MBO */
diff --git a/wpa_supplicant/wpa_supplicant_i.h b/wpa_supplicant/wpa_supplicant_i.h
index 3737dd4..ec486a7 100644
--- a/wpa_supplicant/wpa_supplicant_i.h
+++ b/wpa_supplicant/wpa_supplicant_i.h
@@ -1148,6 +1148,8 @@ const u8 *wpas_mbo_get_bss_attr(struct wpa_supplicant *wpa_s,
struct wpa_bss *bss, enum mbo_attr_id attr);
int wpas_mbo_update_np_chan(struct wpa_supplicant *wpa_s, const char *np_chan);
void wpas_mbo_scan_ie(struct wpa_supplicant *wpa_s, struct wpabuf *ie);
+int wpas_mbo_supp_op_class_ie(struct wpa_supplicant *wpa_s, int freq, u8 *pos,
+ size_t len);
/**
* wpa_supplicant_ctrl_iface_ctrl_rsp_handle - Handle a control response
--
1.9.1
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