epan/dissectors/packet-wifi-display.c

   1 /* packet-wifi-display.c
   2  *
   3  * Wi-Fi Display
   4  *
   5  * Copyright 2011-2013 Qualcomm Atheros, Inc.
   6  *
   7  * SPDX-License-Identifier: GPL-2.0-or-later
   8  */
   9
  10 # include "config.h"
  11
  12 #include <epan/packet.h>
  13 #include <epan/to_str.h>
  14 #include <epan/expert.h>
  15 #include <epan/tfs.h>
  16 #include <wsutil/array.h>
  17
  18 #include "packet-ieee80211.h"
  19
  20 void proto_register_wifi_display(void);
  21 void proto_reg_handoff_wifi_display(void);
  22
  23 static int proto_wifi_display;
  24
  25 static int hf_wfd_subelem_id;
  26 static int hf_wfd_subelem_len;
  27
  28 static int hf_wfd_subelem_dev_info_type;
  29 static int hf_wfd_subelem_dev_info_coupled_sink_source;
  30 static int hf_wfd_subelem_dev_info_coupled_sink_sink;
  31 static int hf_wfd_subelem_dev_info_available;
  32 static int hf_wfd_subelem_dev_info_wsd;
  33 static int hf_wfd_subelem_dev_info_pc;
  34 static int hf_wfd_subelem_dev_info_content_protection;
  35 static int hf_wfd_subelem_dev_info_time_sync;
  36 static int hf_wfd_subelem_dev_info_control_port;
  37 static int hf_wfd_subelem_dev_info_max_throughput;
  38 static int hf_wfd_subelem_dev_info_audio_unsupp_pri_sink;
  39 static int hf_wfd_subelem_dev_info_audio_only_supp_source;
  40 static int hf_wfd_subelem_dev_info_tdls_persistent_group;
  41 static int hf_wfd_subelem_dev_info_tdls_persistent_group_reinvoke;
  42 static int hf_wfd_subelem_dev_info_reserved;
  43
  44 static int hf_wfd_subelem_assoc_bssid;
  45
  46 static int hf_wfd_subelem_coupled_sink_status_bitmap;
  47 static int hf_wfd_subelem_coupled_sink_reserved;
  48 static int hf_wfd_subelem_coupled_sink_mac_addr;
  49
  50 static int hf_wfd_subelem_session_descr_len;
  51 static int hf_wfd_subelem_session_dev_addr;
  52 static int hf_wfd_subelem_session_assoc_bssid;
  53 static int hf_wfd_subelem_session_dev_info_type;
  54 static int hf_wfd_subelem_session_dev_info_coupled_sink_source;
  55 static int hf_wfd_subelem_session_dev_info_coupled_sink_sink;
  56 static int hf_wfd_subelem_session_dev_info_available;
  57 static int hf_wfd_subelem_session_dev_info_wsd;
  58 static int hf_wfd_subelem_session_dev_info_pc;
  59 static int hf_wfd_subelem_session_dev_info_content_protection;
  60 static int hf_wfd_subelem_session_dev_info_time_sync;
  61 static int hf_wfd_subelem_session_dev_info_audio_unsupp_pri_sink;
  62 static int hf_wfd_subelem_session_dev_info_audio_only_supp_source;
  63 static int hf_wfd_subelem_session_dev_info_tdls_persistent_group;
  64 static int hf_wfd_subelem_session_dev_info_tdls_persistent_group_reinvoke;
  65 static int hf_wfd_subelem_session_dev_info_reserved;
  66 static int hf_wfd_subelem_session_dev_info_max_throughput;
  67 static int hf_wfd_subelem_session_coupled_sink_status_bitmap;
  68 static int hf_wfd_subelem_session_coupled_sink_reserved;
  69 static int hf_wfd_subelem_session_coupled_sink_addr;
  70 static int hf_wfd_subelem_session_extra_info;
  71
  72 static int hf_wfd_subelem_ext_capab;
  73 static int hf_wfd_subelem_ext_capab_uibc;
  74 static int hf_wfd_subelem_ext_capab_i2c_read_write;
  75 static int hf_wfd_subelem_ext_capab_preferred_display_mode;
  76 static int hf_wfd_subelem_ext_capab_standby_resume_control;
  77 static int hf_wfd_subelem_ext_capab_tdls_persistent;
  78 static int hf_wfd_subelem_ext_capab_tdls_persistent_bssid;
  79 static int hf_wfd_subelem_ext_capab_reserved;
  80
  81 static int hf_wfd_subelem_alt_mac_addr;
  82
  83 static int ett_wfd_subelem;
  84 static int ett_wfd_dev_info_descr;
  85
  86 static expert_field ei_wfd_subelem_len_invalid;
  87 static expert_field ei_wfd_subelem_session_descr_invalid;
  88 static expert_field ei_wfd_subelem_id;
  89
  90 static dissector_handle_t wifi_display_ie_handle;
  91
  92 enum wifi_display_subelem {
  93   WFD_SUBELEM_DEVICE_INFO = 0,
  94   WFD_SUBELEM_ASSOCIATED_BSSID = 1,
  95   WFD_SUBELEM_AUDIO_FORMATS = 2,
  96   WFD_SUBELEM_VIDEO_FORMATS = 3,
  97   WFD_SUBELEM_3D_VIDEO_FORMATS = 4,
  98   WFD_SUBELEM_CONTENT_PROTECTION = 5,
  99   WFD_SUBELEM_COUPLED_SINK = 6,
 100   WFD_SUBELEM_EXT_CAPAB = 7,
 101   WFD_SUBELEM_LOCAL_IP_ADDRESS = 8,
 102   WFD_SUBELEM_SESSION_INFO = 9,
 103   WFD_SUBELEM_ALT_MAC_ADDR = 10
 104 };
 105
 106 static const value_string wfd_subelem_ids[] = {
 107   { WFD_SUBELEM_DEVICE_INFO, "WFD Device Information" },
 108   { WFD_SUBELEM_ASSOCIATED_BSSID, "Associated BSSID" },
 109   { WFD_SUBELEM_AUDIO_FORMATS, "WFD Audio Formats" },
 110   { WFD_SUBELEM_VIDEO_FORMATS, "WFD Video Formats" },
 111   { WFD_SUBELEM_3D_VIDEO_FORMATS, "WFD 3D Video Formats" },
 112   { WFD_SUBELEM_CONTENT_PROTECTION, "WFD Content Protection" },
 113   { WFD_SUBELEM_COUPLED_SINK, "Coupled Sink Information" },
 114   { WFD_SUBELEM_EXT_CAPAB, "WFD Extended Capability" },
 115   { WFD_SUBELEM_LOCAL_IP_ADDRESS, "Local IP Address" },
 116   { WFD_SUBELEM_SESSION_INFO, "WFD Session Information" },
 117   { WFD_SUBELEM_ALT_MAC_ADDR, "Alternative MAC Address" },
 118   { 0, NULL }
 119 };
 120
 121
 122 static const value_string wfd_dev_info_types[] = {
 123   { 0, "WFD source" },
 124   { 1, "WFD primary sink" },
 125   { 2, "WFD secondary sink" },
 126   { 3, "WFD source/primary sink" },
 127   { 0, NULL }
 128 };
 129
 130 static const value_string wfd_dev_info_avail[] = {
 131   { 0, "Not available for WFD Session" },
 132   { 1, "Available for WFD Session" },
 133   { 0, NULL }
 134 };
 135
 136 static const value_string wfd_dev_info_pc[] = {
 137   { 0, "P2P" },
 138   { 1, "TDLS" },
 139   { 0, NULL }
 140 };
 141
 142 static const value_string wfd_coupled_sink_status_bitmap[] = {
 143   { 0, "Not coupled/Available for Coupling" },
 144   { 1, "Coupled" },
 145   { 2, "Teardown Coupling" },
 146   { 3, "Reserved" },
 147   { 0, NULL }
 148 };
 149
 150 static void
 151 dissect_wfd_subelem_device_info(proto_tree *tree, tvbuff_t *tvb, int offset)
 152 {
 153   proto_tree_add_item(tree, hf_wfd_subelem_dev_info_type,
 154                       tvb, offset, 2, ENC_BIG_ENDIAN);
 155   proto_tree_add_item(tree, hf_wfd_subelem_dev_info_coupled_sink_source,
 156                       tvb, offset, 2, ENC_BIG_ENDIAN);
 157   proto_tree_add_item(tree, hf_wfd_subelem_dev_info_coupled_sink_sink,
 158                       tvb, offset, 2, ENC_BIG_ENDIAN);
 159   proto_tree_add_item(tree, hf_wfd_subelem_dev_info_available,
 160                       tvb, offset, 2, ENC_BIG_ENDIAN);
 161   proto_tree_add_item(tree, hf_wfd_subelem_dev_info_wsd,
 162                       tvb, offset, 2, ENC_BIG_ENDIAN);
 163   proto_tree_add_item(tree, hf_wfd_subelem_dev_info_pc,
 164                       tvb, offset, 2, ENC_BIG_ENDIAN);
 165   proto_tree_add_item(tree, hf_wfd_subelem_dev_info_content_protection,
 166                       tvb, offset, 2, ENC_BIG_ENDIAN);
 167   proto_tree_add_item(tree, hf_wfd_subelem_dev_info_time_sync,
 168                       tvb, offset, 2, ENC_BIG_ENDIAN);
 169   proto_tree_add_item(tree, hf_wfd_subelem_dev_info_audio_unsupp_pri_sink,
 170                       tvb, offset, 2, ENC_BIG_ENDIAN);
 171   proto_tree_add_item(tree, hf_wfd_subelem_dev_info_audio_only_supp_source,
 172                       tvb, offset, 2, ENC_BIG_ENDIAN);
 173   proto_tree_add_item(tree, hf_wfd_subelem_dev_info_tdls_persistent_group,
 174                       tvb, offset, 2, ENC_BIG_ENDIAN);
 175   proto_tree_add_item(tree,
 176                       hf_wfd_subelem_dev_info_tdls_persistent_group_reinvoke,
 177                       tvb, offset, 2, ENC_BIG_ENDIAN);
 178   proto_tree_add_item(tree, hf_wfd_subelem_dev_info_reserved,
 179                       tvb, offset, 2, ENC_BIG_ENDIAN);
 180   offset += 2;
 181
 182   proto_tree_add_item(tree, hf_wfd_subelem_dev_info_control_port,
 183                       tvb, offset, 2, ENC_BIG_ENDIAN);
 184   offset += 2;
 185
 186   proto_tree_add_item(tree, hf_wfd_subelem_dev_info_max_throughput,
 187                       tvb, offset, 2, ENC_BIG_ENDIAN);
 188 }
 189
 190 static void
 191 dissect_wfd_subelem_associated_bssid(packet_info *pinfo, proto_tree *tree,
 192                                      tvbuff_t *tvb, int offset, int len)
 193 {
 194   if (len < 6) {
 195     expert_add_info_format(pinfo, tree, &ei_wfd_subelem_len_invalid, "Too short Wi-Fi Display Associated BSSID");
 196     return;
 197   }
 198   proto_tree_add_item(tree, hf_wfd_subelem_assoc_bssid, tvb, offset, 6, ENC_NA);
 199 }
 200
 201 static void
 202 dissect_wfd_subelem_coupled_sink(packet_info *pinfo, proto_tree *tree,
 203                                  tvbuff_t *tvb, int offset, int len)
 204 {
 205   if (len < 1) {
 206     expert_add_info_format(pinfo, tree, &ei_wfd_subelem_len_invalid, "Too short Wi-Fi Display Coupled Sink");
 207     return;
 208   }
 209   proto_tree_add_item(tree, hf_wfd_subelem_coupled_sink_status_bitmap,
 210                       tvb, offset, 1, ENC_BIG_ENDIAN);
 211   proto_tree_add_item(tree, hf_wfd_subelem_coupled_sink_reserved,
 212                       tvb, offset, 1, ENC_BIG_ENDIAN);
 213   if (len < 1 + 6) {
 214     expert_add_info_format(pinfo, tree, &ei_wfd_subelem_len_invalid, "Too short Wi-Fi Display Coupled Sink");
 215     return;
 216   }
 217   proto_tree_add_item(tree, hf_wfd_subelem_coupled_sink_mac_addr, tvb,
 218                       offset + 1, 6, ENC_NA);
 219 }
 220
 221 static void
 222 dissect_wfd_subelem_session_info(packet_info *pinfo, proto_tree *tree,
 223                                  tvbuff_t *tvb, int offset, uint16_t len)
 224 {
 225   int end = offset + len, next;
 226   proto_item *item;
 227   proto_tree *descr;
 228
 229   while (offset < end) {
 230     uint8_t dlen = tvb_get_uint8(tvb, offset);
 231     next = offset + 1 + dlen;
 232
 233     descr = proto_tree_add_subtree(tree, tvb, offset, 1 + dlen,
 234                                ett_wfd_dev_info_descr, &item, "WFD Device Info Descriptor");
 235     if (offset + 1 + dlen > end || dlen < 23) {
 236       expert_add_info(pinfo, item, &ei_wfd_subelem_session_descr_invalid);
 237       break;
 238     }
 239
 240     proto_tree_add_item(descr, hf_wfd_subelem_session_descr_len,
 241                         tvb, offset, 1, ENC_BIG_ENDIAN);
 242     offset++;
 243
 244     proto_tree_add_item(descr, hf_wfd_subelem_session_dev_addr, tvb, offset, 6,
 245                         ENC_NA);
 246     proto_item_append_text(descr, ": %s", tvb_ether_to_str(pinfo->pool, tvb, offset));
 247     offset += 6;
 248
 249     proto_tree_add_item(descr, hf_wfd_subelem_session_assoc_bssid,
 250                         tvb, offset, 6, ENC_NA);
 251     offset += 6;
 252
 253     proto_tree_add_item(descr, hf_wfd_subelem_session_dev_info_type,
 254                         tvb, offset, 2, ENC_BIG_ENDIAN);
 255     proto_tree_add_item(descr,
 256                         hf_wfd_subelem_session_dev_info_coupled_sink_source,
 257                         tvb, offset, 2, ENC_BIG_ENDIAN);
 258     proto_tree_add_item(descr,
 259                         hf_wfd_subelem_session_dev_info_coupled_sink_sink,
 260                         tvb, offset, 2, ENC_BIG_ENDIAN);
 261     proto_tree_add_item(descr, hf_wfd_subelem_session_dev_info_available,
 262                         tvb, offset, 2, ENC_BIG_ENDIAN);
 263     proto_tree_add_item(descr, hf_wfd_subelem_session_dev_info_wsd,
 264                         tvb, offset, 2, ENC_BIG_ENDIAN);
 265     proto_tree_add_item(descr, hf_wfd_subelem_session_dev_info_pc,
 266                         tvb, offset, 2, ENC_BIG_ENDIAN);
 267     proto_tree_add_item(descr,
 268                         hf_wfd_subelem_session_dev_info_content_protection,
 269                         tvb, offset, 2, ENC_BIG_ENDIAN);
 270     proto_tree_add_item(descr, hf_wfd_subelem_session_dev_info_time_sync,
 271                         tvb, offset, 2, ENC_BIG_ENDIAN);
 272     proto_tree_add_item(tree,
 273                         hf_wfd_subelem_session_dev_info_audio_unsupp_pri_sink,
 274                         tvb, offset, 2, ENC_BIG_ENDIAN);
 275     proto_tree_add_item(tree,
 276                         hf_wfd_subelem_session_dev_info_audio_only_supp_source,
 277                         tvb, offset, 2, ENC_BIG_ENDIAN);
 278     proto_tree_add_item(tree,
 279                         hf_wfd_subelem_session_dev_info_tdls_persistent_group,
 280                         tvb, offset, 2, ENC_BIG_ENDIAN);
 281     proto_tree_add_item(tree,
 282                         hf_wfd_subelem_session_dev_info_tdls_persistent_group_reinvoke,
 283                         tvb, offset, 2, ENC_BIG_ENDIAN);
 284     proto_tree_add_item(tree,
 285                         hf_wfd_subelem_session_dev_info_reserved,
 286                         tvb, offset, 2, ENC_BIG_ENDIAN);
 287     offset += 2;
 288
 289     proto_tree_add_item(descr, hf_wfd_subelem_session_dev_info_max_throughput,
 290                         tvb, offset, 2, ENC_BIG_ENDIAN);
 291     offset += 2;
 292
 293     proto_tree_add_item(descr,
 294                         hf_wfd_subelem_session_coupled_sink_status_bitmap,
 295                         tvb, offset, 1, ENC_BIG_ENDIAN);
 296     proto_tree_add_item(descr,
 297                         hf_wfd_subelem_session_coupled_sink_reserved,
 298                         tvb, offset, 1, ENC_BIG_ENDIAN);
 299     offset++;
 300
 301     proto_tree_add_item(descr, hf_wfd_subelem_session_coupled_sink_addr,
 302                         tvb, offset, 6, ENC_NA);
 303     offset += 6;
 304
 305     if (offset < next) {
 306       proto_tree_add_item(descr, hf_wfd_subelem_session_extra_info, tvb, offset, next - offset, ENC_NA);
 307     }
 308
 309     offset = next;
 310   }
 311 }
 312
 313 static void
 314 dissect_wfd_subelem_ext_capab(packet_info *pinfo, proto_tree *tree,
 315                                  tvbuff_t *tvb, int offset, int len)
 316 {
 317   if (len<2) {
 318     expert_add_info_format(pinfo, tree, &ei_wfd_subelem_len_invalid,
 319                            "Too short Wi-Fi Display Extended Capability");
 320     return;
 321   }
 322   proto_tree_add_item(tree, hf_wfd_subelem_ext_capab,
 323                       tvb, offset, 2, ENC_BIG_ENDIAN);
 324   proto_tree_add_item(tree, hf_wfd_subelem_ext_capab_uibc,
 325                       tvb, offset, 2, ENC_BIG_ENDIAN);
 326   proto_tree_add_item(tree, hf_wfd_subelem_ext_capab_i2c_read_write,
 327                       tvb, offset, 2, ENC_BIG_ENDIAN);
 328   proto_tree_add_item(tree, hf_wfd_subelem_ext_capab_preferred_display_mode,
 329                       tvb, offset, 2, ENC_BIG_ENDIAN);
 330   proto_tree_add_item(tree, hf_wfd_subelem_ext_capab_standby_resume_control,
 331                       tvb, offset, 2, ENC_BIG_ENDIAN);
 332   proto_tree_add_item(tree, hf_wfd_subelem_ext_capab_tdls_persistent,
 333                       tvb, offset, 2, ENC_BIG_ENDIAN);
 334   proto_tree_add_item(tree, hf_wfd_subelem_ext_capab_tdls_persistent_bssid,
 335                       tvb, offset, 2, ENC_BIG_ENDIAN);
 336   proto_tree_add_item(tree, hf_wfd_subelem_ext_capab_reserved,
 337                       tvb, offset, 2, ENC_BIG_ENDIAN);
 338 }
 339
 340 static void
 341 dissect_wfd_subelem_alt_mac_addr(packet_info *pinfo, proto_tree *tree,
 342                                  tvbuff_t *tvb, int offset, int len)
 343 {
 344   if (len<6) {
 345     expert_add_info_format(pinfo, tree, &ei_wfd_subelem_len_invalid,
 346                            "Too short Wi-Fi Display Alternative MAC Address");
 347     return;
 348   }
 349   proto_tree_add_item(tree, hf_wfd_subelem_alt_mac_addr,
 350                       tvb, offset, 6, ENC_NA);
 351 }
 352
 353 static int
 354 dissect_wifi_display_ie(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, void *data _U_)
 355 {
 356   int end = tvb_reported_length(tvb);
 357   int offset = 0;
 358   uint8_t id;
 359   uint16_t len;
 360   proto_tree *wfd_tree;
 361   proto_item *subelem;
 362
 363   while (offset < end) {
 364     if (end - offset < 2) {
 365       expert_add_info_format(pinfo, tree, &ei_wfd_subelem_len_invalid, "Packet too short for Wi-Fi Display subelement");
 366       break;
 367     }
 368
 369     id = tvb_get_uint8(tvb, offset);
 370     len = tvb_get_ntohs(tvb, offset + 1);
 371     wfd_tree = proto_tree_add_subtree(tree, tvb, offset, 3 + len,
 372                                   ett_wfd_subelem, &subelem,
 373                                   val_to_str(id, wfd_subelem_ids,
 374                                              "Unknown subelement ID (%u)"));
 375     if (offset + 3 + len > end) {
 376       expert_add_info_format(pinfo, subelem, &ei_wfd_subelem_len_invalid, "Packet too short for Wi-Fi Display subelement payload");
 377     }
 378
 379     proto_tree_add_item(wfd_tree, hf_wfd_subelem_id, tvb, offset, 1,
 380                         ENC_BIG_ENDIAN);
 381     offset++;
 382     proto_tree_add_item(wfd_tree, hf_wfd_subelem_len, tvb, offset, 2,
 383                         ENC_BIG_ENDIAN);
 384     offset += 2;
 385
 386     switch (id) {
 387     case WFD_SUBELEM_DEVICE_INFO:
 388       dissect_wfd_subelem_device_info(wfd_tree, tvb, offset);
 389       break;
 390     case WFD_SUBELEM_ASSOCIATED_BSSID:
 391       dissect_wfd_subelem_associated_bssid(pinfo, wfd_tree, tvb, offset, len);
 392       break;
 393     case WFD_SUBELEM_COUPLED_SINK:
 394       dissect_wfd_subelem_coupled_sink(pinfo, wfd_tree, tvb, offset, len);
 395       break;
 396     case WFD_SUBELEM_SESSION_INFO:
 397       dissect_wfd_subelem_session_info(pinfo, wfd_tree, tvb, offset, len);
 398       break;
 399     case WFD_SUBELEM_EXT_CAPAB:
 400       dissect_wfd_subelem_ext_capab(pinfo, wfd_tree, tvb, offset, len);
 401       break;
 402     case WFD_SUBELEM_ALT_MAC_ADDR:
 403       dissect_wfd_subelem_alt_mac_addr(pinfo, wfd_tree, tvb, offset, len);
 404       break;
 405     default:
 406       expert_add_info(pinfo, subelem, &ei_wfd_subelem_id);
 407       break;
 408     }
 409
 410     offset += len;
 411   }
 412
 413   return tvb_captured_length(tvb);
 414 }
 415
 416 void
 417 proto_register_wifi_display(void)
 418 {
 419   static hf_register_info hf[] = {
 420     { &hf_wfd_subelem_id,
 421       { "Subelement ID", "wifi_display.subelem.id",
 422         FT_UINT8, BASE_DEC, VALS(wfd_subelem_ids), 0, NULL, HFILL }},
 423     { &hf_wfd_subelem_len,
 424       { "Length", "wifi_display.subelem.length",
 425         FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }},
 426     { &hf_wfd_subelem_dev_info_type,
 427       { "Device type", "wifi_display.subelem.dev_info.type",
 428         FT_UINT16, BASE_DEC, VALS(wfd_dev_info_types), 0x0003, NULL, HFILL }},
 429     { &hf_wfd_subelem_dev_info_coupled_sink_source,
 430       { "Coupled sink operation supported by WFD source",
 431         "wifi_display.subelem.dev_info.coupled_sink_by_source",
 432         FT_BOOLEAN, 16, NULL, 0x0004, NULL, HFILL }},
 433     { &hf_wfd_subelem_dev_info_coupled_sink_sink,
 434       { "Coupled sink operation supported by WFD sink",
 435         "wifi_display.subelem.dev_info.coupled_sink_by_sink",
 436         FT_BOOLEAN, 16, NULL, 0x0008, NULL, HFILL }},
 437     { &hf_wfd_subelem_dev_info_available,
 438       { "Available for WFD Session", "wifi_display.subelem.dev_info.available",
 439         FT_UINT16, BASE_DEC, VALS(wfd_dev_info_avail), 0x0030, NULL, HFILL }},
 440     { &hf_wfd_subelem_dev_info_wsd,
 441       { "WFD Service Discovery", "wifi_display.subelem.dev_info.wsd",
 442         FT_BOOLEAN, 16, NULL, 0x0040, NULL, HFILL }},
 443     { &hf_wfd_subelem_dev_info_pc,
 444       { "Preferred Connectivity", "wifi_display.subelem.dev_info.pc",
 445         FT_UINT16, BASE_DEC, VALS(wfd_dev_info_pc), 0x0080, NULL, HFILL }},
 446     { &hf_wfd_subelem_dev_info_content_protection,
 447       { "Content Protection using HDCP2.0",
 448         "wifi_display.subelem.dev_info.content_protection",
 449         FT_BOOLEAN, 16, NULL, 0x0100, NULL, HFILL }},
 450     { &hf_wfd_subelem_dev_info_time_sync,
 451       { "Time Synchronization using 802.1AS",
 452         "wifi_display.subelem.dev_info.time_sync",
 453         FT_BOOLEAN, 16, NULL, 0x0200, NULL, HFILL }},
 454     { &hf_wfd_subelem_dev_info_audio_unsupp_pri_sink,
 455       { "Audio un-supported at Primary sink",
 456         "wifi_display.subelem.session.audio_unsupp_pri_sink",
 457         FT_BOOLEAN, 16, NULL, 0x0400, NULL, HFILL }},
 458     { &hf_wfd_subelem_dev_info_audio_only_supp_source,
 459       { "Audio only support af WFD source",
 460         "wifi_display.subelem.session.audio_only_supp_source",
 461         FT_BOOLEAN, 16, NULL, 0x0800, NULL, HFILL }},
 462     { &hf_wfd_subelem_dev_info_tdls_persistent_group,
 463       { "TDLS Persistent Group",
 464         "wifi_display.subelem.session.tdls_persistent_group",
 465         FT_BOOLEAN, 16, NULL, 0x1000, NULL, HFILL }},
 466     { &hf_wfd_subelem_dev_info_tdls_persistent_group_reinvoke,
 467       { "TDLS Persistent Group Re-invoke",
 468         "wifi_display.subelem.session.tdls_persistent_group_reinvoke",
 469         FT_BOOLEAN, 16, NULL, 0x2000, NULL, HFILL }},
 470     { &hf_wfd_subelem_dev_info_reserved,
 471       { "Reserved", "wifi_display.subelem.session.reserved",
 472         FT_UINT16, BASE_DEC, NULL, 0xc000, NULL, HFILL }},
 473     { &hf_wfd_subelem_dev_info_control_port,
 474       { "Session Management Control Port",
 475         "wifi_display.subelem.dev_info.control_port",
 476         FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }},
 477     { &hf_wfd_subelem_dev_info_max_throughput,
 478       { "WFD Device Maximum Throughput (Mbps)",
 479         "wifi_display.subelem.dev_info.max_throughput",
 480         FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }},
 481     { &hf_wfd_subelem_assoc_bssid,
 482       { "Associated BSSID", "wifi_display.subelem.assoc_bssid.bssid",
 483         FT_ETHER, BASE_NONE, NULL, 0, NULL, HFILL }},
 484     { &hf_wfd_subelem_coupled_sink_status_bitmap,
 485       { "Coupled Sink Status bitmap",
 486         "wifi_display.subelem.coupled_sink.status",
 487         FT_UINT8, BASE_DEC, VALS(wfd_coupled_sink_status_bitmap), 0x03,
 488         NULL, HFILL }},
 489     { &hf_wfd_subelem_coupled_sink_reserved,
 490       { "Reserved", "wifi_display.subelem.coupled_sink.reserved",
 491         FT_UINT8, BASE_DEC, NULL, 0xfc, NULL, HFILL }},
 492     { &hf_wfd_subelem_coupled_sink_mac_addr,
 493       { "Coupled Sink MAC Address",
 494         "wifi_display.subelem.coupled_sink.mac_addr",
 495         FT_ETHER, BASE_NONE, NULL, 0, NULL, HFILL }},
 496     { &hf_wfd_subelem_session_descr_len,
 497       { "Descriptor length",
 498         "wifi_display.subelem.session.descr_len",
 499         FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }},
 500     { &hf_wfd_subelem_session_dev_addr,
 501       { "Device address",
 502         "wifi_display.subelem.session.device_address",
 503         FT_ETHER, BASE_NONE, NULL, 0, NULL, HFILL }},
 504     { &hf_wfd_subelem_session_assoc_bssid,
 505       { "Associated BSSID",
 506         "wifi_display.subelem.session.associated_bssid",
 507         FT_ETHER, BASE_NONE, NULL, 0, NULL, HFILL }},
 508     { &hf_wfd_subelem_session_dev_info_type,
 509       { "Device type", "wifi_display.subelem.session.type",
 510         FT_UINT16, BASE_DEC, VALS(wfd_dev_info_types), 0x0003, NULL, HFILL }},
 511     { &hf_wfd_subelem_session_dev_info_coupled_sink_source,
 512       { "Coupled sink operation supported by WFD source",
 513         "wifi_display.subelem.session.coupled_sink_by_source",
 514         FT_BOOLEAN, 16, NULL, 0x0004, NULL, HFILL }},
 515     { &hf_wfd_subelem_session_dev_info_coupled_sink_sink,
 516       { "Coupled sink operation supported by WFD sink",
 517         "wifi_display.subelem.session.coupled_sink_by_sink",
 518         FT_BOOLEAN, 16, NULL, 0x0008, NULL, HFILL }},
 519     { &hf_wfd_subelem_session_dev_info_available,
 520       { "Available for WFD Session", "wifi_display.subelem.session.available",
 521         FT_UINT16, BASE_DEC, VALS(wfd_dev_info_avail), 0x0030, NULL, HFILL }},
 522     { &hf_wfd_subelem_session_dev_info_wsd,
 523       { "WFD Service Discovery", "wifi_display.subelem.session.wsd",
 524         FT_BOOLEAN, 16, NULL, 0x0040, NULL, HFILL }},
 525     { &hf_wfd_subelem_session_dev_info_pc,
 526       { "Preferred Connectivity", "wifi_display.subelem.session.pc",
 527         FT_UINT16, BASE_DEC, VALS(wfd_dev_info_pc), 0x0080, NULL, HFILL }},
 528     { &hf_wfd_subelem_session_dev_info_content_protection,
 529       { "Content Protection using HDCP2.0",
 530         "wifi_display.subelem.session.content_protection",
 531         FT_BOOLEAN, 16, NULL, 0x0100, NULL, HFILL }},
 532     { &hf_wfd_subelem_session_dev_info_time_sync,
 533       { "Time Synchronization using 802.1AS",
 534         "wifi_display.subelem.session.time_sync",
 535         FT_BOOLEAN, 16, NULL, 0x0200, NULL, HFILL }},
 536     { &hf_wfd_subelem_session_dev_info_audio_unsupp_pri_sink,
 537       { "Audio un-supported at Primary sink",
 538         "wifi_display.subelem.session.audio_unsupp_pri_sink",
 539         FT_BOOLEAN, 16, NULL, 0x0400, NULL, HFILL }},
 540     { &hf_wfd_subelem_session_dev_info_audio_only_supp_source,
 541       { "Audio only support af WFD source",
 542         "wifi_display.subelem.session.audio_only_supp_source",
 543         FT_BOOLEAN, 16, NULL, 0x0800, NULL, HFILL }},
 544     { &hf_wfd_subelem_session_dev_info_tdls_persistent_group,
 545       { "TDLS Persistent Group",
 546         "wifi_display.subelem.session.tdls_persistent_group",
 547         FT_BOOLEAN, 16, NULL, 0x1000, NULL, HFILL }},
 548     { &hf_wfd_subelem_session_dev_info_tdls_persistent_group_reinvoke,
 549       { "TDLS Persistent Group Re-invoke",
 550         "wifi_display.subelem.session.tdls_persistent_group_reinvoke",
 551         FT_BOOLEAN, 16, NULL, 0x2000, NULL, HFILL }},
 552     { &hf_wfd_subelem_session_dev_info_reserved,
 553       { "Reserved", "wifi_display.subelem.session.reserved",
 554         FT_UINT16, BASE_DEC, NULL, 0xc000, NULL, HFILL }},
 555     { &hf_wfd_subelem_session_dev_info_max_throughput,
 556       { "WFD Device Maximum Throughput (Mbps)",
 557         "wifi_display.subelem.session.max_throughput",
 558         FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }},
 559     { &hf_wfd_subelem_session_coupled_sink_status_bitmap,
 560       { "Coupled Sink Status bitmap",
 561         "wifi_display.subelem.session.coupled_sink_status",
 562         FT_UINT8, BASE_DEC, VALS(wfd_coupled_sink_status_bitmap), 0x03,
 563         NULL, HFILL }},
 564     { &hf_wfd_subelem_session_coupled_sink_reserved,
 565       { "Reserved", "wifi_display.subelem.session.coupled_sink.reserved",
 566         FT_UINT8, BASE_DEC, NULL, 0xfc, NULL, HFILL }},
 567     { &hf_wfd_subelem_session_coupled_sink_addr,
 568       { "Coupled peer sink address",
 569         "wifi_display.subelem.session.coupled_peer_sink_addr",
 570         FT_ETHER, BASE_NONE, NULL, 0, NULL, HFILL }},
 571     { &hf_wfd_subelem_session_extra_info,
 572       { "Extra info in the end of descriptor",
 573         "wifi_display.subelem.session.extra_info",
 574         FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL }},
 575     { &hf_wfd_subelem_ext_capab,
 576       { "WFD Extended Capability Bitmap",
 577         "wifi_display.subelem.ext_capab",
 578         FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},
 579     { &hf_wfd_subelem_ext_capab_uibc,
 580       { "User Input Back Channel(UIBC)",
 581         "wifi_display.subelem.ext_capab.uibc",
 582         FT_BOOLEAN, 16, TFS (&tfs_supported_not_supported), 0x0001, NULL, HFILL }},
 583     { &hf_wfd_subelem_ext_capab_i2c_read_write,
 584       { "I2C Read/Write",
 585         "wifi_display.subelem.ext_capab.i2c_read_write",
 586         FT_BOOLEAN, 16, TFS (&tfs_supported_not_supported), 0x0002, NULL, HFILL }},
 587     { &hf_wfd_subelem_ext_capab_preferred_display_mode,
 588       { "Preferred Display Mode",
 589         "wifi_display.subelem.ext_capab.preferred_display_mode",
 590         FT_BOOLEAN, 16, TFS (&tfs_supported_not_supported), 0x0004, NULL, HFILL }},
 591     { &hf_wfd_subelem_ext_capab_standby_resume_control,
 592       { "Standby and Resume Control",
 593         "wifi_display.subelem.ext_capab.standby_resume_control",
 594         FT_BOOLEAN, 16, TFS (&tfs_supported_not_supported), 0x0008, NULL, HFILL }},
 595     { &hf_wfd_subelem_ext_capab_tdls_persistent,
 596       { "TDLS Persistent",
 597         "wifi_display.subelem.ext_capab.tdls_persistent",
 598         FT_BOOLEAN, 16, TFS (&tfs_supported_not_supported), 0x0010, NULL, HFILL }},
 599     { &hf_wfd_subelem_ext_capab_tdls_persistent_bssid,
 600       { "TDLS Persistent BSSID",
 601         "wifi_display.subelem.ext_capab.tdls_persistent_bssid",
 602         FT_BOOLEAN, 16, TFS (&tfs_supported_not_supported), 0x0020, NULL, HFILL }},
 603     { &hf_wfd_subelem_ext_capab_reserved,
 604       { "Reserved", "wifi_display.subelem.ext_capab.reserved",
 605         FT_UINT16, BASE_HEX, NULL, 0xffc0, NULL, HFILL }},
 606     { &hf_wfd_subelem_alt_mac_addr,
 607       { "Alternative MAC Address", "wifi_display.subelem.alt_mac_addr",
 608         FT_ETHER, BASE_NONE, NULL, 0, NULL, HFILL }},
 609   };
 610   static int *ett[] = {
 611     &ett_wfd_subelem,
 612     &ett_wfd_dev_info_descr
 613   };
 614
 615   static ei_register_info ei[] = {
 616       { &ei_wfd_subelem_len_invalid, { "wifi_display.subelem.length.invalid", PI_MALFORMED, PI_ERROR, "Subelement length invalid", EXPFILL }},
 617       { &ei_wfd_subelem_session_descr_invalid, { "wifi_display.subelem.session.descr_invalid", PI_MALFORMED, PI_ERROR, "Invalid WFD Device Info Descriptor", EXPFILL }},
 618       { &ei_wfd_subelem_id, { "wifi_display.subelem.id.unknown", PI_PROTOCOL, PI_WARN, "Unknown subelement payload", EXPFILL }},
 619   };
 620
 621   expert_module_t* expert_wifi_display;
 622
 623   proto_wifi_display = proto_register_protocol("Wi-Fi Display", "WFD", "wifi_display");
 624   proto_register_field_array(proto_wifi_display, hf, array_length(hf));
 625   proto_register_subtree_array(ett, array_length(ett));
 626
 627   expert_wifi_display = expert_register_protocol(proto_wifi_display);
 628   expert_register_field_array(expert_wifi_display, ei, array_length(ei));
 629
 630   wifi_display_ie_handle = register_dissector("wifi_display_ie", dissect_wifi_display_ie, proto_wifi_display);
 631
 632 }
 633
 634 void
 635 proto_reg_handoff_wifi_display(void)
 636 {
 637   dissector_add_uint("wlan.ie.wifi_alliance.subtype", WFA_SUBTYPE_WIFI_DISPLAY, wifi_display_ie_handle);
 638 }
 639
 640 /*
 641  * Editor modelines
 642  *
 643  * Local Variables:
 644  * c-basic-offset: 2
 645  * tab-width: 8
 646  * indent-tabs-mode: nil
 647  * End:
 648  *
 649  * ex: set shiftwidth=2 tabstop=8 expandtab:
 650  * :indentSize=2:tabSize=8:noTabs=true:
 651  */