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hw_features: Fix check of supported 802.11ac channel width

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The two channel width bits in the VHT capability field can be decoded in
following values (IEEE Std 802.11ac-2013 8.4.2.160.2 VHT Capabilities
Info field):

 * 0: no 160 or 80+80 MHz support
 * 1: 160 MHz support
 * 2: 160 and 80+80 MHz support
 * 3: (reserved)

The check must therefore not be done bitwise but instead it must checked
whether the capabilities announced by the driver are at least the ones
requested by the user.

Fixes: c781eb8428 ("hostapd: Verify VHT capabilities are supported by driver")
Signed-off-by: Sven Eckelmann <sven.eckelmann@openmesh.com>
This commit is contained in:
Sven Eckelmann 2017-06-09 11:39:51 +02:00 committed by Jouni Malinen
parent 9a6e2a5ede
commit b0fc2ef3a3
2 changed files with 2 additions and 2 deletions
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3
src/common/hw_features_common.c
View file

@ -526,8 +526,7 @@ int ieee80211ac_cap_check(u32 hw, u32 conf)
} while (0)
VHT_CAP_CHECK_MAX(VHT_CAP_MAX_MPDU_LENGTH_MASK);
VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160MHZ);
VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ);
VHT_CAP_CHECK_MAX(VHT_CAP_SUPP_CHAN_WIDTH_MASK);
VHT_CAP_CHECK(VHT_CAP_RXLDPC);
VHT_CAP_CHECK(VHT_CAP_SHORT_GI_80);
VHT_CAP_CHECK(VHT_CAP_SHORT_GI_160);

1
src/common/ieee802_11_defs.h
View file

@ -1127,6 +1127,7 @@ struct ieee80211_ampe_ie {
#define VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ((u32) BIT(2))
#define VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ ((u32) BIT(3))
#define VHT_CAP_SUPP_CHAN_WIDTH_MASK ((u32) BIT(2) | BIT(3))
#define VHT_CAP_SUPP_CHAN_WIDTH_MASK_SHIFT 2
#define VHT_CAP_RXLDPC ((u32) BIT(4))
#define VHT_CAP_SHORT_GI_80 ((u32) BIT(5))
#define VHT_CAP_SHORT_GI_160 ((u32) BIT(6))