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authorAvraham Stern <avraham.stern@intel.com>2016-02-15 14:53:34 (GMT)
committerJouni Malinen <j@w1.fi>2016-02-22 17:53:04 (GMT)
commit5e57ba2505589210118799a2261044cabe42055f (patch)
tree0f86d23087507aa972fa647179277a821f00393f /wpa_supplicant/mbo.c
parent7d46f586debf2b36cce934913e7def92fee3d404 (diff)
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MBO: Add Supported Operating Classes element to Association Request
Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Diffstat (limited to 'wpa_supplicant/mbo.c')
-rw-r--r--wpa_supplicant/mbo.c252
1 files changed, 252 insertions, 0 deletions
diff --git a/wpa_supplicant/mbo.c b/wpa_supplicant/mbo.c
index a60d1d3..4663dd2 100644
--- a/wpa_supplicant/mbo.c
+++ b/wpa_supplicant/mbo.c
@@ -368,3 +368,255 @@ 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 enum chan_allowed 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)) ||
+ (i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_50)) ||
+ (i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_30)) ||
+ (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)) ||
+ (i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_130)) ||
+ (i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_110)) ||
+ (i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_90)) ||
+ (i == 4 && !(flags & HOSTAPD_CHAN_VHT_90_70)) ||
+ (i == 5 && !(flags & HOSTAPD_CHAN_VHT_110_50)) ||
+ (i == 6 && !(flags & HOSTAPD_CHAN_VHT_130_30)) ||
+ (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;
+
+ 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 20 MHz 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,
+ &current, &chan) == NUM_HOSTAPD_MODES)
+ return 0;
+
+ /*
+ * Need 3 bytes for EID, length, and current operating class, plus
+ * 1 byte for every other supported operating class.
+ */
+ buf = wpabuf_alloc(global_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_put(buf, 1);
+ wpabuf_put_u8(buf, current);
+
+ for (op = 0; global_op_class[op].op_class; op++) {
+ if (wpas_op_class_supported(wpa_s, &global_op_class[op]))
+ wpabuf_put_u8(buf, global_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_buf(MSG_DEBUG,
+ "MBO: Added supported operating classes IE",
+ buf);
+ }
+
+ wpabuf_free(buf);
+ return res;
+}