epan/dissectors/packet-aoe.c

   1 /* packet-aoe.c
   2  * Routines for dissecting the ATA over Ethernet protocol.
   3  *   Ronnie Sahlberg 2004
   4  *
   5  * $Id$
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include "config.h"
  23
  24 #include <glib.h>
  25
  26 #include <epan/packet.h>
  27 #include <epan/wmem/wmem.h>
  28 #include <epan/conversation.h>
  29 #include <etypes.h>
  30
  31 void proto_register_aoe(void);
  32 void proto_reg_handoff_aoe(void);
  33
  34 static int proto_aoe;
  35 static int hf_aoe_version=-1;
  36 static int hf_aoe_flags_response=-1;
  37 static int hf_aoe_flags_error=-1;
  38 static int hf_aoe_error=-1;
  39 static int hf_aoe_major=-1;
  40 static int hf_aoe_minor=-1;
  41 static int hf_aoe_cmd=-1;
  42 static int hf_aoe_tag=-1;
  43 static int hf_aoe_aflags_e=-1;
  44 static int hf_aoe_aflags_d=-1;
  45 static int hf_aoe_aflags_a=-1;
  46 static int hf_aoe_aflags_w=-1;
  47 static int hf_aoe_err_feature=-1;
  48 static int hf_aoe_sector_count=-1;
  49 static int hf_aoe_acmd=-1;
  50 static int hf_aoe_astatus=-1;
  51 static int hf_aoe_lba=-1;
  52 static int hf_aoe_response_in=-1;
  53 static int hf_aoe_response_to=-1;
  54 static int hf_aoe_time=-1;
  55
  56 static gint ett_aoe = -1;
  57 static gint ett_aoe_flags = -1;
  58
  59 #define AOE_FLAGS_RESPONSE 0x08
  60 #define AOE_FLAGS_ERROR    0x04
  61
  62 #define AOE_AFLAGS_E    0x40
  63 #define AOE_AFLAGS_D    0x10
  64 #define AOE_AFLAGS_A    0x02
  65 #define AOE_AFLAGS_W    0x01
  66
  67 static const true_false_string tfs_aflags_e = {
  68   "LBA48 extended command",
  69   "Normal command"
  70 };
  71 static const true_false_string tfs_aflags_d = {
  72   "?",
  73   "?"
  74 };
  75 static const true_false_string tfs_aflags_a = {
  76   "ASYNCHRONOUS Write",
  77   "synchronous write"
  78 };
  79 static const true_false_string tfs_aflags_w = {
  80   "WRITE to the device",
  81   "No write to device"
  82 };
  83
  84 static const true_false_string tfs_response = {
  85   "Response",
  86   "Request"
  87 };
  88
  89 static const true_false_string tfs_error = {
  90   "Error",
  91   "No error"
  92 };
  93
  94 static const value_string error_vals[] = {
  95   { 1, "Unrecognized command code" },
  96   { 2, "Bad argument parameter" },
  97   { 3, "Device unavailable" },
  98   { 4, "Config string present" },
  99   { 5, "Unsupported version" },
 100   { 0, NULL}
 101 };
 102
 103 #define AOE_CMD_ISSUE_ATA_COMMAND  0
 104 #define AOE_CMD_QUERY_CONFIG_INFO  1
 105 static const value_string cmd_vals[] = {
 106   { AOE_CMD_ISSUE_ATA_COMMAND, "Issue ATA Command" },
 107   { AOE_CMD_QUERY_CONFIG_INFO, "Query Config Information" },
 108   { 0, NULL}
 109 };
 110
 111 static const value_string ata_cmd_vals[] = {
 112   { 0x00, "NOP" },
 113   { 0x08, "Atapi soft reset" },
 114   { 0x10, "Recalibrate" },
 115   { 0x20, "Read sectors (with retry)" },
 116   { 0x21, "Read sectors (no retry)" },
 117   { 0x22, "Read long (with retry)" },
 118   { 0x23, "Read long (no retry)" },
 119   { 0x24, "Read ext" },
 120   { 0x30, "Write sectors (with retry)" },
 121   { 0x31, "Write sectors (no retry)" },
 122   { 0x32, "Write long (with retry)" },
 123   { 0x33, "Write long (no retry)" },
 124   { 0x34, "Write ext" },
 125   { 0x3c, "Write verify" },
 126   { 0x40, "Read verify sectors (with retry)" },
 127   { 0x41, "Read verify sectors (no retry)" },
 128   { 0x50, "Format track" },
 129   { 0x70, "Seek" },
 130   { 0x90, "Execute device diagnostics" },
 131   { 0x91, "Initialize device parameters" },
 132   { 0x92, "Download microcode" },
 133   { 0x94, "Standy immediate" },
 134   { 0x95, "Idle immediate" },
 135   { 0x96, "Standby" },
 136   { 0x97, "Idle" },
 137   { 0x98, "Check power mode" },
 138   { 0x99, "Sleep" },
 139   { 0xa0, "Atapi packet" },
 140   { 0xa1, "Atapi identify device" },
 141   { 0xa2, "Atapi service" },
 142   { 0xb0, "Smart" },
 143   { 0xc4, "Read multiple" },
 144   { 0xc5, "Write multiple" },
 145   { 0xc6, "Set multiple mode" },
 146   { 0xc8, "Read dma (with retry)" },
 147   { 0xc9, "Read dma (no retry)" },
 148   { 0xca, "Write dma (with retry)" },
 149   { 0xcb, "Write dma (no retry)" },
 150   { 0xde, "Door lock" },
 151   { 0xdf, "Door unlock" },
 152   { 0xe0, "Standy immediate" },
 153   { 0xe1, "Idle immediate" },
 154   { 0xe2, "Standby" },
 155   { 0xe3, "Idle" },
 156   { 0xe4, "Read buffer" },
 157   { 0xe5, "Check power mode" },
 158   { 0xe6, "Sleep" },
 159   { 0xe8, "Write buffer" },
 160   { 0xec, "Identify Device" },
 161   { 0xed, "Media eject" },
 162   { 0xee, "Identify device dma" },
 163   { 0xef, "Set features" },
 164   { 0xf1, "Security set password" },
 165   { 0xf2, "Security unlock" },
 166   { 0xf3, "Security erase prepare" },
 167   { 0xf4, "Security erase unit" },
 168   { 0xf5, "Security freeze" },
 169   { 0xf6, "Security disable password" },
 170   { 0, NULL}
 171 };
 172
 173 typedef struct ata_info_t {
 174   guint32 tag;
 175   void *conversation; /* just used to multiplex different conversations */
 176   guint32 request_frame;
 177   guint32 response_frame;
 178   nstime_t req_time;
 179   guint8 cmd;
 180 } ata_info_t;
 181 static GHashTable *ata_cmd_unmatched = NULL;
 182 static GHashTable *ata_cmd_matched = NULL;
 183
 184 static guint
 185 ata_cmd_hash_matched(gconstpointer k)
 186 {
 187   return GPOINTER_TO_UINT(k);
 188 }
 189
 190 static gint
 191 ata_cmd_equal_matched(gconstpointer k1, gconstpointer k2)
 192 {
 193   return k1==k2;
 194 }
 195
 196 static guint
 197 ata_cmd_hash_unmatched(gconstpointer k)
 198 {
 199   const ata_info_t *key = (const ata_info_t *)k;
 200
 201   return key->tag;
 202 }
 203
 204 static gint
 205 ata_cmd_equal_unmatched(gconstpointer k1, gconstpointer k2)
 206 {
 207   const ata_info_t *key1 = (const ata_info_t *)k1;
 208   const ata_info_t *key2 = (const ata_info_t *)k2;
 209
 210   return (key1->tag==key2->tag)&&(key1->conversation==key2->conversation);
 211 }
 212
 213 static void
 214 dissect_ata_pdu(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gboolean response, guint32 tag)
 215 {
 216   proto_item *tmp_item;
 217   guint8 aflags;
 218   guint64 lba;
 219   ata_info_t *ata_info=NULL;
 220   conversation_t *conversation;
 221
 222   /* only create a conversation for ATA commands */
 223   conversation = find_or_create_conversation(pinfo);
 224
 225   if( !(pinfo->fd->flags.visited) ){
 226     if(!response){
 227       ata_info_t *tmp_ata_info;
 228       /* first time we see this request so add a struct for request/response
 229          matching */
 230       ata_info=wmem_new(wmem_file_scope(), ata_info_t);
 231       ata_info->tag=tag;
 232       ata_info->conversation=conversation;
 233       ata_info->request_frame=pinfo->fd->num;
 234       ata_info->response_frame=0;
 235       ata_info->cmd=tvb_get_guint8(tvb, offset+3);
 236       ata_info->req_time=pinfo->fd->abs_ts;
 237
 238       tmp_ata_info=(ata_info_t *)g_hash_table_lookup(ata_cmd_unmatched, ata_info);
 239       if(tmp_ata_info){
 240         g_hash_table_remove(ata_cmd_unmatched, tmp_ata_info);
 241       }
 242       g_hash_table_insert(ata_cmd_unmatched, ata_info, ata_info);
 243     } else {
 244       ata_info_t tmp_ata_info;
 245       /* first time we see this response so see if we can match it with
 246          a request */
 247       tmp_ata_info.tag=tag;
 248       tmp_ata_info.conversation=conversation;
 249       ata_info=(ata_info_t *)g_hash_table_lookup(ata_cmd_unmatched, &tmp_ata_info);
 250       /* woo hoo we could, so no need to store this in unmatched any more,
 251          move both request and response to the matched table */
 252       if(ata_info){
 253         ata_info->response_frame=pinfo->fd->num;
 254         g_hash_table_remove(ata_cmd_unmatched, ata_info);
 255         g_hash_table_insert(ata_cmd_matched, GUINT_TO_POINTER(ata_info->request_frame), ata_info);
 256         g_hash_table_insert(ata_cmd_matched, GUINT_TO_POINTER(ata_info->response_frame), ata_info);
 257       }
 258     }
 259   } else {
 260     ata_info=(ata_info_t *)g_hash_table_lookup(ata_cmd_matched, GUINT_TO_POINTER(pinfo->fd->num));
 261   }
 262
 263   if(ata_info){
 264     if(response){
 265       if(ata_info->request_frame){
 266         nstime_t delta_ts;
 267         tmp_item=proto_tree_add_uint(tree, hf_aoe_response_to, tvb, 0, 0, ata_info->request_frame);
 268         PROTO_ITEM_SET_GENERATED(tmp_item);
 269                 nstime_delta(&delta_ts, &pinfo->fd->abs_ts, &ata_info->req_time);
 270         tmp_item=proto_tree_add_time(tree, hf_aoe_time, tvb, offset, 0, &delta_ts);
 271         PROTO_ITEM_SET_GENERATED(tmp_item);
 272       }
 273     } else {
 274       if(ata_info->response_frame){
 275         tmp_item=proto_tree_add_uint(tree, hf_aoe_response_in, tvb, 0, 0, ata_info->response_frame);
 276         PROTO_ITEM_SET_GENERATED(tmp_item);
 277       }
 278     }
 279   }
 280
 281   /* aflags */
 282   aflags=tvb_get_guint8(tvb, offset);
 283   proto_tree_add_item(tree, hf_aoe_aflags_e, tvb, offset, 1, ENC_BIG_ENDIAN);
 284   if(aflags&AOE_AFLAGS_E){
 285     proto_tree_add_item(tree, hf_aoe_aflags_d, tvb, offset, 1, ENC_BIG_ENDIAN);
 286   }
 287   if(aflags&AOE_AFLAGS_W){
 288     proto_tree_add_item(tree, hf_aoe_aflags_a, tvb, offset, 1, ENC_BIG_ENDIAN);
 289   }
 290   proto_tree_add_item(tree, hf_aoe_aflags_w, tvb, offset, 1, ENC_BIG_ENDIAN);
 291   offset++;
 292
 293   /* err/feature */
 294   proto_tree_add_item(tree, hf_aoe_err_feature, tvb, offset, 1, ENC_BIG_ENDIAN);
 295   offset++;
 296
 297   /* sector count */
 298   proto_tree_add_item(tree, hf_aoe_sector_count, tvb, offset, 1, ENC_BIG_ENDIAN);
 299   offset++;
 300
 301   /* ata command/status */
 302   if(!response){
 303     proto_tree_add_item(tree, hf_aoe_acmd, tvb, offset, 1, ENC_BIG_ENDIAN);
 304     col_append_fstr(pinfo->cinfo, COL_INFO, " ATA:%s", val_to_str(tvb_get_guint8(tvb, offset), ata_cmd_vals, " Unknown ATA<0x%02x>"));
 305   } else {
 306     proto_tree_add_item(tree, hf_aoe_astatus, tvb, offset, 1, ENC_BIG_ENDIAN);
 307     if(ata_info != NULL && ata_info->request_frame){
 308       /* we dont know what command it was unless we saw the request_frame */
 309       tmp_item=proto_tree_add_uint(tree, hf_aoe_acmd, tvb, 0, 0, ata_info->cmd);
 310       PROTO_ITEM_SET_GENERATED(tmp_item);
 311       col_append_fstr(pinfo->cinfo, COL_INFO, " ATA:%s", val_to_str(ata_info->cmd, ata_cmd_vals, " Unknown ATA<0x%02x>"));
 312     }
 313   }
 314   offset++;
 315
 316   /*lba   probably complete wrong */
 317   lba=tvb_get_letohs(tvb, offset+4);
 318   lba=(lba<<32)|tvb_get_letohl(tvb, offset);
 319   offset+=8;
 320   proto_tree_add_uint64(tree, hf_aoe_lba, tvb, offset-8, 6, lba);
 321
 322 }
 323
 324 static void
 325 dissect_aoe_v1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 326 {
 327   guint8 flags, cmd;
 328   guint32 tag;
 329   proto_item *flags_item=NULL;
 330   proto_tree *flags_tree=NULL;
 331
 332   /* read and dissect the flags */
 333   flags=tvb_get_guint8(tvb, 0)&0x0f;
 334   if(tree){
 335     flags_item=proto_tree_add_text(tree, tvb, 0, 1, "Flags:");
 336     flags_tree=proto_item_add_subtree(flags_item, ett_aoe_flags);
 337   }
 338   proto_tree_add_item(flags_tree, hf_aoe_flags_response, tvb, 0, 1, ENC_BIG_ENDIAN);
 339   proto_tree_add_item(flags_tree, hf_aoe_flags_error, tvb, 0, 1, ENC_BIG_ENDIAN);
 340   if(flags_item){
 341     proto_item_append_text(flags_item,(flags&AOE_FLAGS_RESPONSE)?" Response":" Request");
 342     if(flags&AOE_FLAGS_ERROR){
 343       proto_item_append_text(flags_item, " Error");
 344     }
 345   }
 346
 347
 348   /* error */
 349   if(flags&AOE_FLAGS_ERROR){
 350     proto_tree_add_item(tree, hf_aoe_error, tvb, 1, 1, ENC_BIG_ENDIAN);
 351         col_append_fstr(pinfo->cinfo, COL_INFO, "Error:%s ", val_to_str(tvb_get_guint8(tvb, 1), error_vals, "Unknown error<%d>"));
 352   }
 353
 354   /* major/minor address */
 355   proto_tree_add_item(tree, hf_aoe_major, tvb, 2, 2, ENC_BIG_ENDIAN);
 356   proto_tree_add_item(tree, hf_aoe_minor, tvb, 4, 1, ENC_BIG_ENDIAN);
 357
 358   /* command */
 359   cmd=tvb_get_guint8(tvb, 5);
 360   proto_tree_add_item(tree, hf_aoe_cmd, tvb, 5, 1, ENC_BIG_ENDIAN);
 361   col_append_fstr(pinfo->cinfo, COL_INFO, "%s %s", val_to_str(cmd, cmd_vals, "Unknown command<%d>"), (flags&AOE_FLAGS_RESPONSE)?"Response":"Request");
 362
 363
 364   /* tag */
 365   tag=tvb_get_letohl(tvb, 6);
 366   proto_tree_add_item(tree, hf_aoe_tag, tvb, 6, 4, ENC_BIG_ENDIAN);
 367
 368
 369   switch(cmd){
 370   case AOE_CMD_ISSUE_ATA_COMMAND:
 371     dissect_ata_pdu(pinfo, tree, tvb, 10, flags&AOE_FLAGS_RESPONSE, tag);
 372     break;
 373   case AOE_CMD_QUERY_CONFIG_INFO:
 374     break;
 375   }
 376
 377 }
 378
 379 static void
 380 dissect_aoe(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
 381 {
 382   proto_item *item=NULL;
 383   proto_tree *tree=NULL;
 384   guint8 version;
 385
 386   col_set_str(pinfo->cinfo, COL_PROTOCOL, "AoE");
 387   col_clear(pinfo->cinfo, COL_INFO);
 388
 389   if (parent_tree) {
 390     item = proto_tree_add_item(parent_tree, proto_aoe, tvb, 0, -1, ENC_NA);
 391     tree = proto_item_add_subtree(item, ett_aoe);
 392   }
 393
 394   version=tvb_get_guint8(tvb, 0)>>4;
 395   proto_tree_add_uint(tree, hf_aoe_version, tvb, 0, 1, version);
 396   switch(version){
 397   case 1:
 398     dissect_aoe_v1(tvb, pinfo, tree);
 399     break;
 400   }
 401 }
 402
 403 static void
 404 ata_init(void)
 405 {
 406   if(ata_cmd_unmatched){
 407     g_hash_table_destroy(ata_cmd_unmatched);
 408     ata_cmd_unmatched=NULL;
 409   }
 410   ata_cmd_unmatched=g_hash_table_new(ata_cmd_hash_unmatched, ata_cmd_equal_unmatched);
 411
 412   if(ata_cmd_matched){
 413     g_hash_table_destroy(ata_cmd_matched);
 414     ata_cmd_matched=NULL;
 415   }
 416   ata_cmd_matched=g_hash_table_new(ata_cmd_hash_matched, ata_cmd_equal_matched);
 417
 418 }
 419
 420 void
 421 proto_register_aoe(void)
 422 {
 423
 424   static hf_register_info hf[] = {
 425     { &hf_aoe_cmd,
 426       { "Command", "aoe.cmd", FT_UINT8, BASE_DEC, VALS(cmd_vals), 0x0,
 427         "AOE Command", HFILL}},
 428     { &hf_aoe_version,
 429       { "Version", "aoe.version", FT_UINT8, BASE_DEC, NULL, 0x0,
 430         "Version of the AOE protocol", HFILL}},
 431     { &hf_aoe_error,
 432       { "Error", "aoe.error", FT_UINT8, BASE_DEC, VALS(error_vals), 0x0,
 433         "Error code", HFILL}},
 434     { &hf_aoe_err_feature,
 435       { "Err/Feature", "aoe.err_feature", FT_UINT8, BASE_HEX, NULL, 0x0,
 436         NULL, HFILL}},
 437     { &hf_aoe_sector_count,
 438       { "Sector Count", "aoe.sector_count", FT_UINT8, BASE_DEC, NULL, 0x0,
 439         NULL, HFILL}},
 440     { &hf_aoe_flags_response,
 441       { "Response flag", "aoe.response", FT_BOOLEAN, 8, TFS(&tfs_response), AOE_FLAGS_RESPONSE, "Whether this is a response PDU or not", HFILL}},
 442     { &hf_aoe_flags_error,
 443       { "Error flag", "aoe.flags_error", FT_BOOLEAN, 8, TFS(&tfs_error), AOE_FLAGS_ERROR, "Whether this is an error PDU or not", HFILL}},
 444     { &hf_aoe_major,
 445       { "Major", "aoe.major", FT_UINT16, BASE_HEX, NULL, 0x0,
 446         "Major address", HFILL}},
 447     { &hf_aoe_minor,
 448       { "Minor", "aoe.minor", FT_UINT8, BASE_HEX, NULL, 0x0,
 449         "Minor address", HFILL}},
 450     { &hf_aoe_acmd,
 451       { "ATA Cmd", "aoe.ata.cmd", FT_UINT8, BASE_HEX, VALS(ata_cmd_vals), 0x0,
 452         "ATA command opcode", HFILL}},
 453     { &hf_aoe_astatus,
 454       { "ATA Status", "aoe.ata.status", FT_UINT8, BASE_HEX, NULL, 0x0,
 455         "ATA status bits", HFILL}},
 456     { &hf_aoe_tag,
 457       { "Tag", "aoe.tag", FT_UINT32, BASE_HEX, NULL, 0x0,
 458         "Command Tag", HFILL}},
 459     { &hf_aoe_aflags_e,
 460       { "E", "aoe.aflags.e", FT_BOOLEAN, 8, TFS(&tfs_aflags_e), AOE_AFLAGS_E, "Whether this is a normal or LBA48 command", HFILL}},
 461     { &hf_aoe_aflags_d,
 462       { "D", "aoe.aflags.d", FT_BOOLEAN, 8, TFS(&tfs_aflags_d), AOE_AFLAGS_D, NULL, HFILL}},
 463     { &hf_aoe_aflags_a,
 464       { "A", "aoe.aflags.a", FT_BOOLEAN, 8, TFS(&tfs_aflags_a), AOE_AFLAGS_A, "Whether this is an asynchronous write or not", HFILL}},
 465     { &hf_aoe_aflags_w,
 466       { "W", "aoe.aflags.w", FT_BOOLEAN, 8, TFS(&tfs_aflags_w), AOE_AFLAGS_W, "Is this a command writing data to the device or not", HFILL}},
 467     { &hf_aoe_lba,
 468       { "Lba", "aoe.lba", FT_UINT64, BASE_HEX, NULL, 0x00, "Lba address", HFILL}},
 469     { &hf_aoe_response_in,
 470       { "Response In", "aoe.response_in", FT_FRAMENUM, BASE_NONE, NULL, 0x0, "The response to this packet is in this frame", HFILL }},
 471     { &hf_aoe_response_to,
 472       { "Response To", "aoe.response_to", FT_FRAMENUM, BASE_NONE, NULL, 0x0, "This is a response to the ATA command in this frame", HFILL }},
 473     { &hf_aoe_time,
 474       { "Time from request", "aoe.time", FT_RELATIVE_TIME, BASE_NONE, NULL, 0, "Time between Request and Reply for ATA calls", HFILL }},
 475   };
 476
 477   static gint *ett[] = {
 478     &ett_aoe,
 479     &ett_aoe_flags,
 480   };
 481
 482   proto_aoe = proto_register_protocol("ATAoverEthernet", "AOE", "aoe");
 483   proto_register_field_array(proto_aoe, hf, array_length(hf));
 484   proto_register_subtree_array(ett, array_length(ett));
 485
 486   register_dissector("aoe", dissect_aoe, proto_aoe);
 487   register_init_routine(ata_init);
 488 }
 489
 490 void
 491 proto_reg_handoff_aoe(void)
 492 {
 493   dissector_handle_t aoe_handle;
 494
 495   aoe_handle = find_dissector("aoe");
 496   dissector_add_uint("ethertype", ETHERTYPE_AOE, aoe_handle);
 497
 498 }