Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 12558] New: Inconsistent VHT data rate

[bugzilla-daemon@xxxxxxxxxxxxx]

Bug ID	12558
Summary	Inconsistent VHT data rate
Product	Wireshark
Version	2.0.4
Hardware	x86
OS	Mac OS X 10.11
Status	UNCONFIRMED
Severity	Major
Priority	Low
Component	Dissection engine (libwireshark)
Assignee	bugzilla-admin@wireshark.org
Reporter	shukla.a@gmail.com

Created attachment 14680 [details]
vht 20mhz mcs 9 1ss packet

Build Information:
Paste the COMPLETE build information from "Help->About Wireshark", "wireshark
-v", or "tshark -v".
--
    VHT 20MHz MCS 9 1/2/3/4 stream data rate not displayed.
    Currently the other illegal MCSs e.g., 80MHz MCS6 when LDPC is not being
used are disaplyed as data rate values.
    Also, VHT 20MHz 3x3 MCS9 is valid which as of now is not computed.
    Changed the rate table to include rate (mbps) for VHT 20MHz MCS9 to have
    consistent behavior among all MCSs, spatial stream combinations.
    Attached a packet capture showing example packet.

The following patch should fix this issue.

diff --git a/epan/dissectors/packet-ieee80211-radiotap.c
b/epan/dissectors/packet-ieee80211-radiotap.c
index 3d4d6d5..ac67b0d 100644
--- a/epan/dissectors/packet-ieee80211-radiotap.c
+++ b/epan/dissectors/packet-ieee80211-radiotap.c
@@ -374,7 +374,7 @@ static const struct mcs_vht_info
ieee80211_vhtinfo[MAX_MCS_VHT_INDEX+1] = {
                },
                /* MCS  9  */
                {       "256-QAM",      "5/6",
-                               {               /* 20 Mhz */  {    0.0f,       
        /* SGI */    0.0f, },
+                               {               /* 20 Mhz */  {   86.7f,       
        /* SGI */   96.3f, },
                                                /* 40 Mhz */  {  180.0f,       
        /* SGI */  200.0f, },
                                                /* 80 Mhz */  {  390.0f,       
        /* SGI */  433.3f, },
                                                /* 160 Mhz */ {  780.0f,       
        /* SGI */  866.7f, }

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