ieee80211: Add Extreme (Zebra) Vendor Specific TLV

Only decode subtype 1 : AP Name with unknown data (7 bytes)

Change-Id: I4fc0c6fff1a931075ab333a8527251f12acb2827
Reviewed-on: https://code.wireshark.org/review/19586
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>

3 files changed, 81 insertions, 0 deletions

diff --git a/epan/dissectors/packet-ieee80211.c b/epan/dissectors/packet-ieee80211.c
index d181fa193c..807f84e868 100644
--- a/epan/dissectors/packet-ieee80211.c
+++ b/epan/dissectors/packet-ieee80211.c
@@ -4332,6 +4332,12 @@ static int hf_ieee80211_vs_meru_subtype = -1;
 static int hf_ieee80211_vs_meru_sublength = -1;
 static int hf_ieee80211_vs_meru_subdata = -1;
 
+static int hf_ieee80211_vs_extreme_subtype = -1;
+static int hf_ieee80211_vs_extreme_subdata = -1;
+static int hf_ieee80211_vs_extreme_unknown = -1;
+static int hf_ieee80211_vs_extreme_ap_length = -1;
+static int hf_ieee80211_vs_extreme_ap_name = -1;
+
 static int hf_ieee80211_rsn_ie_pmkid = -1;
 static int hf_ieee80211_rsn_ie_unknown = -1;
 
@@ -10581,6 +10587,50 @@ dissect_vendor_ie_meru(proto_item *item _U_, proto_tree *ietree,
   }
 }
 
+static const value_string ieee80211_vs_extreme_subtype_vals[] = {
+  { 1, "AP Name"},
+  { 0, NULL }
+};
+
+static void
+dissect_vendor_ie_extreme(proto_item *item _U_, proto_tree *ietree,
+                          tvbuff_t *tvb, int offset, guint32 tag_len,
+                          packet_info *pinfo)
+{
+  guint32 type, length;
+  proto_item *ti_len;
+
+  proto_tree_add_item_ret_uint(ietree, hf_ieee80211_vs_extreme_subtype, tvb, offset, 1, ENC_NA, &type);
+  offset += 1;
+  tag_len -= 1;
+
+  proto_tree_add_item(ietree, hf_ieee80211_vs_extreme_subdata, tvb, offset, tag_len, ENC_NA);
+
+  switch(type){
+    case 1: /* Unknown (7 bytes) + AP Name Length (1 byte) + AP Name */
+
+      proto_tree_add_item(ietree, hf_ieee80211_vs_extreme_unknown, tvb, offset, 7, ENC_NA);
+      offset += 7;
+      tag_len -= 1;
+
+      ti_len = proto_tree_add_item_ret_uint(ietree, hf_ieee80211_vs_extreme_ap_length, tvb, offset, 1, ENC_NA, &length);
+      offset += 1;
+      tag_len -= 1;
+
+      if (tag_len < length) {
+        expert_add_info_format(pinfo, ti_len, &ei_ieee80211_tag_length, "Tag length < AP Length");
+        length = tag_len;
+      }
+
+    proto_tree_add_item(ietree, hf_ieee80211_vs_extreme_ap_name, tvb, offset, length, ENC_ASCII|ENC_NA);
+
+    break;
+    default:
+    /* Expert info ? */
+    break;
+  }
+}
+
 /* 802.11-2012 8.4.2.37 QoS Capability element */
 static int
 dissect_qos_capability(proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, int offset, int ftype)
@@ -15221,6 +15271,9 @@ add_tagged_field(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset
         case OUI_MERU:
           dissect_vendor_ie_meru(ti, tree, tvb, offset, tag_vs_len, pinfo);
           break;
+        case OUI_ZEBRA_EXTREME:
+          dissect_vendor_ie_extreme(ti, tree, tvb, offset, tag_vs_len, pinfo);
+          break;
         default:
           proto_tree_add_item(tree, hf_ieee80211_tag_vendor_data, tvb, offset, tag_vs_len, ENC_NA);
           break;
@@ -26056,6 +26109,32 @@ proto_register_ieee80211(void)
       FT_BYTES, BASE_NONE, NULL, 0,
       NULL, HFILL }},
 
+    /* Vendor Specific : Extreme (Zebra) */
+    {&hf_ieee80211_vs_extreme_subtype,
+     {"Subtype", "wlan.vs.extreme.subtype",
+      FT_UINT8, BASE_DEC, VALS(ieee80211_vs_extreme_subtype_vals), 0,
+      NULL, HFILL }},
+
+    {&hf_ieee80211_vs_extreme_subdata,
+     {"Subdata", "wlan.vs.extreme.subdata",
+      FT_BYTES, BASE_NONE, NULL, 0,
+      NULL, HFILL }},
+
+    {&hf_ieee80211_vs_extreme_unknown,
+     {"Unknown", "wlan.vs.extreme.unknown",
+      FT_BYTES, BASE_NONE, NULL, 0,
+      NULL, HFILL }},
+
+    {&hf_ieee80211_vs_extreme_ap_length,
+     {"AP Length", "wlan.vs.extreme.ap_length",
+      FT_UINT8, BASE_DEC, NULL, 0,
+      NULL, HFILL }},
+
+    {&hf_ieee80211_vs_extreme_ap_name,
+     {"AP Name", "wlan.vs.extreme.ap_name",
+      FT_STRING, BASE_NONE, NULL, 0,
+      NULL, HFILL }},
+
     {&hf_ieee80211_tsinfo,
      {"Traffic Stream (TS) Info", "wlan.ts_info",
       FT_UINT24, BASE_HEX, NULL, 0,
diff --git a/epan/oui.c b/epan/oui.c
index 535c671bd0..26c1157db8 100644
--- a/epan/oui.c
+++ b/epan/oui.c
@@ -87,6 +87,7 @@ http://www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/113ed_cr/ibm_r
     { OUI_DCBX,             "Data Center Bridging Capabilities Exchange" },
     { OUI_AVAYA,            "Avaya" },
     { OUI_MERU,             "Meru Network (Fortinet)" },
+    { OUI_ZEBRA_EXTREME,    "Extreme (Zebra)" },
     { 0,                    NULL }
 };
 
diff --git a/epan/oui.h b/epan/oui.h
index c0c6a9f5a4..3417993873 100644
--- a/epan/oui.h
+++ b/epan/oui.h
@@ -88,6 +88,7 @@
 #define OUI_WFA             0x506F9A    /* Wi-Fi Alliance */
 #define OUI_3GPP2           0xCF0002    /* 3GPP2 */
 #define OUI_MERU            0x000ce6    /* Meru Network (Fortinet) */
+#define OUI_ZEBRA_EXTREME   0x00A0F8    /* Extreme/WING (Zebra) */
 
 extern const value_string oui_vals[];