Add support for new peekremote features.

Enhanced peekremote dissector to take into account the new extended
flags written by Cisco APs in sniffer mode after WLC version 8.5.

Support for 80mhz channel flag (bit 9), short preamble (bit 8), amount
of spatial streams (bit 14-16)
dot11_ht_vht_flags=0x00000551 <--short preamble encoded to 10th bit of
dot11_ht_vht_flags.
dot11_ht_vht_flags=0x00008bc8 <--80MHz info encoded to 9th bit of
dot11_ht_vht_flags.

The spatial streams information is already encoded to 16:15:14 bits of
dot11_ht_vht_flags. The following are the bit pattern representation,
000 - 1 spatial stream
001 - 2 spatial streams
010 - 3 spatial streams

Bug: 14452
Change-Id: If0539e356b32a791901d213a653f7a98521667ee
Reviewed-on: https://code.wireshark.org/review/26178
Reviewed-by: Guy Harris <guy@alum.mit.edu>

1 files changed, 30 insertions, 1 deletions

diff --git a/epan/dissectors/packet-peekremote.c b/epan/dissectors/packet-peekremote.c
index 4dc3bfd2a6..d6fecbc2d2 100644
--- a/epan/dissectors/packet-peekremote.c
+++ b/epan/dissectors/packet-peekremote.c
@@ -118,6 +118,14 @@ static const value_string peekremote_mcs_index_vals_ac[] = {
   { 0, NULL }
 };
 
+static const value_string spatialstreams_vals[] = {
+  { 0, "1" },
+  { 1, "2" },
+  { 2, "3" },
+  { 3, "4" },
+  { 0, NULL }
+};
+
 static const value_string peekremote_type_vals[] = {
   { 6, "kMediaSpecificHdrType_Wireless3" },
   { 0, NULL }
@@ -143,7 +151,10 @@ static const value_string peekremote_type_vals[] = {
 #define EXT_FLAG_AMSDU                          0x00000040
 #define EXT_FLAG_802_11ac                       0x00000080
 #define EXT_FLAG_MCS_INDEX_USED                 0x00000100
-#define EXT_FLAGS_RESERVED                      0xFFFFFE00
+#define EXT_FLAG_80MHZ                          0x00000200
+#define EXT_FLAG_SHORTPREAMBLE                  0x00000400
+#define EXT_FLAG_SPATIALSTREAMS                 0x0001C000
+#define EXT_FLAGS_RESERVED                      0xFFFE0000
 
 /* hfi elements */
 #define THIS_HF_INIT HFI_INIT(proto_peekremote)
@@ -300,6 +311,18 @@ static header_field_info hfi_peekremote_extflags_future_use THIS_HF_INIT =
       { "MCS index used",     "peekremote.extflags.future_use", FT_BOOLEAN, 32, TFS(&tfs_yes_no),
         EXT_FLAG_MCS_INDEX_USED, NULL, HFILL };
 
+static header_field_info hfi_peekremote_extflags_80mhz THIS_HF_INIT =
+      { "80 Mhz",     "peekremote.extflags.80mhz", FT_BOOLEAN, 32, TFS(&tfs_yes_no),
+        EXT_FLAG_80MHZ, NULL, HFILL };
+
+static header_field_info hfi_peekremote_extflags_shortpreamble THIS_HF_INIT =
+      { "Short preamble",     "peekremote.extflags.shortpreamble", FT_BOOLEAN, 32, TFS(&tfs_yes_no),
+        EXT_FLAG_SHORTPREAMBLE, NULL, HFILL };
+
+static header_field_info hfi_peekremote_extflags_spatialstreams THIS_HF_INIT =
+      { "Spatial streams",     "peekremote.extflags.spatialstreams", FT_UINT32, BASE_DEC, VALS(spatialstreams_vals),
+        EXT_FLAG_SPATIALSTREAMS, NULL, HFILL };
+
 static header_field_info hfi_peekremote_extflags_reserved THIS_HF_INIT =
       { "Reserved",     "peekremote.extflags.reserved", FT_UINT32, BASE_HEX, NULL,
         EXT_FLAGS_RESERVED, "Must be zero", HFILL };
@@ -365,6 +388,9 @@ dissect_peekremote_extflags(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *t
   proto_tree_add_item(extflags_tree, &hfi_peekremote_extflags_amsdu, tvb, offset, 4, ENC_BIG_ENDIAN);
   proto_tree_add_item(extflags_tree, &hfi_peekremote_extflags_11ac, tvb, offset, 4, ENC_BIG_ENDIAN);
   proto_tree_add_item(extflags_tree, &hfi_peekremote_extflags_future_use, tvb, offset, 4, ENC_BIG_ENDIAN);
+  proto_tree_add_item(extflags_tree, &hfi_peekremote_extflags_80mhz, tvb, offset, 4, ENC_BIG_ENDIAN);
+  proto_tree_add_item(extflags_tree, &hfi_peekremote_extflags_shortpreamble, tvb, offset, 4, ENC_BIG_ENDIAN);
+  proto_tree_add_item(extflags_tree, &hfi_peekremote_extflags_spatialstreams, tvb, offset, 4, ENC_BIG_ENDIAN);
   proto_tree_add_item(extflags_tree, &hfi_peekremote_extflags_reserved, tvb, offset, 4, ENC_BIG_ENDIAN);
 
   return 4;
@@ -651,6 +677,9 @@ proto_register_peekremote(void)
     &hfi_peekremote_extflags_amsdu,
     &hfi_peekremote_extflags_11ac,
     &hfi_peekremote_extflags_future_use,
+    &hfi_peekremote_extflags_80mhz,
+    &hfi_peekremote_extflags_shortpreamble,
+    &hfi_peekremote_extflags_spatialstreams,
     &hfi_peekremote_extflags_reserved,
     &hfi_peekremote_signal_1_dbm,
     &hfi_peekremote_signal_2_dbm,