[PATCH 1/4] nl80211: add supported BW parsing

[Dmitrii Lebed]

From: Dmitry Lebed <dlebed at quantenna.com>

Add NL80211_FREQUENCY_ATTR_NO_* channel attributes parsing.
Needed for correct checking if channel is available in
particular BW.

Signed-off-by: Dmitry Lebed <dlebed at quantenna.com>
---
 src/ap/dfs.c                      |  1 -
 src/drivers/driver.h              | 20 ++++++++++++++++++++
 src/drivers/driver_nl80211_capa.c | 20 ++++++++++++++++++++
 3 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/src/ap/dfs.c b/src/ap/dfs.c
index f1476eee0..8c56cbb96 100644
--- a/src/ap/dfs.c
+++ b/src/ap/dfs.c
@@ -172,7 +172,6 @@ static int is_in_chanlist(struct hostapd_iface *iface,
        return freq_range_list_includes(&iface->conf->acs_ch_list, chan->chan);
 }

-
 /*
  * The function assumes HT40+ operation.
  * Make sure to adjust the following variables after calling this:
diff --git a/src/drivers/driver.h b/src/drivers/driver.h
index 92a58b2f2..37a31d3bc 100644
--- a/src/drivers/driver.h
+++ b/src/drivers/driver.h
@@ -58,6 +58,20 @@
 #define HOSTAPD_CHAN_VHT_130_30 0x04000000
 #define HOSTAPD_CHAN_VHT_150_10 0x08000000

+/* Allowed BW mask */
+enum hostapd_chan_width_attr {
+       HOSTAPD_CHAN_WIDTH_10   = BIT(0),
+       HOSTAPD_CHAN_WIDTH_20   = BIT(1),
+       HOSTAPD_CHAN_WIDTH_40P  = BIT(2),
+       HOSTAPD_CHAN_WIDTH_40M  = BIT(3),
+       HOSTAPD_CHAN_WIDTH_80   = BIT(4),
+       HOSTAPD_CHAN_WIDTH_160  = BIT(5),
+
+       /* all new elements goes before this line */
+       __HOSTAPD_CHAN_WIDTH_AFTER_LAST,
+       HOSTAPD_CHAN_WIDTH_ALL = __HOSTAPD_CHAN_WIDTH_AFTER_LAST - 2
+};
+
 /* Filter gratuitous ARP */
 #define WPA_DATA_FRAME_FILTER_FLAG_ARP BIT(0)
 /* Filter unsolicited Neighbor Advertisement */
@@ -110,6 +124,12 @@ struct hostapd_channel_data {
         */
        int flag;

+       /**
+        * allowed_bw - allowed channel width bitmask
+        * see enum hostapd_chan_width_attr
+        */
+       u32 allowed_bw;
+
        /**
         * max_tx_power - Regulatory transmit power limit in dBm
         */
diff --git a/src/drivers/driver_nl80211_capa.c b/src/drivers/driver_nl80211_capa.c
index e5bc7693b..ea6139c87 100644
--- a/src/drivers/driver_nl80211_capa.c
+++ b/src/drivers/driver_nl80211_capa.c
@@ -1286,6 +1286,7 @@ static void phy_info_freq(struct hostapd_hw_modes *mode,
        u8 channel;
        chan->freq = nla_get_u32(tb_freq[NL80211_FREQUENCY_ATTR_FREQ]);
        chan->flag = 0;
+       chan->allowed_bw = HOSTAPD_CHAN_WIDTH_ALL;
        chan->dfs_cac_ms = 0;
        if (ieee80211_freq_to_chan(chan->freq, &channel) != NUM_HOSTAPD_MODES)
                chan->chan = channel;
@@ -1301,6 +1302,19 @@ static void phy_info_freq(struct hostapd_hw_modes *mode,
        if (tb_freq[NL80211_FREQUENCY_ATTR_GO_CONCURRENT])
                chan->flag |= HOSTAPD_CHAN_GO_CONCURRENT;

+       if (tb_freq[NL80211_FREQUENCY_ATTR_NO_10MHZ])
+               chan->allowed_bw &= ~HOSTAPD_CHAN_WIDTH_10;
+       if (tb_freq[NL80211_FREQUENCY_ATTR_NO_20MHZ])
+               chan->allowed_bw &= ~HOSTAPD_CHAN_WIDTH_20;
+       if (tb_freq[NL80211_FREQUENCY_ATTR_NO_HT40_PLUS])
+               chan->allowed_bw &= ~HOSTAPD_CHAN_WIDTH_40P;
+       if (tb_freq[NL80211_FREQUENCY_ATTR_NO_HT40_MINUS])
+               chan->allowed_bw &= ~HOSTAPD_CHAN_WIDTH_40M;
+       if (tb_freq[NL80211_FREQUENCY_ATTR_NO_80MHZ])
+               chan->allowed_bw &= ~HOSTAPD_CHAN_WIDTH_80;
+       if (tb_freq[NL80211_FREQUENCY_ATTR_NO_160MHZ])
+               chan->allowed_bw &= ~HOSTAPD_CHAN_WIDTH_160;
+
        if (tb_freq[NL80211_FREQUENCY_ATTR_DFS_STATE]) {
                enum nl80211_dfs_state state =
                        nla_get_u32(tb_freq[NL80211_FREQUENCY_ATTR_DFS_STATE]);
@@ -1335,6 +1349,12 @@ static int phy_info_freqs(struct phy_info_arg *phy_info,
                [NL80211_FREQUENCY_ATTR_RADAR] = { .type = NLA_FLAG },
                [NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32 },
                [NL80211_FREQUENCY_ATTR_DFS_STATE] = { .type = NLA_U32 },
+               [NL80211_FREQUENCY_ATTR_NO_10MHZ] = { .type = NLA_FLAG },
+               [NL80211_FREQUENCY_ATTR_NO_20MHZ] = { .type = NLA_FLAG },
+               [NL80211_FREQUENCY_ATTR_NO_HT40_PLUS] = { .type = NLA_FLAG },
+               [NL80211_FREQUENCY_ATTR_NO_HT40_MINUS] = { .type = NLA_FLAG },
+               [NL80211_FREQUENCY_ATTR_NO_80MHZ] = { .type = NLA_FLAG },
+               [NL80211_FREQUENCY_ATTR_NO_160MHZ] = { .type = NLA_FLAG },
        };
        int new_channels = 0;
        struct hostapd_channel_data *channel;
--
2.16.1



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