The Tcpdump Group git mirrors - tcpdump/blob - print-aoe.c

   1 /*
   2  * This module implements decoding of the ATA over Ethernet (AoE) protocol
   3  * according to the following specification:
   4  * http://support.coraid.com/documents/AoEr11.txt
   5  *
   6  * Copyright (c) 2014 The TCPDUMP project
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  21  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  22  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  26  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  28  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #define NETDISSECT_REWORKED
  33 #ifdef HAVE_CONFIG_H
  34 #include "config.h"
  35 #endif
  36
  37 #include <tcpdump-stdinc.h>
  38
  39 #include "interface.h"
  40 #include "extract.h"
  41 #include "addrtoname.h"
  42 #include "ether.h"
  43
  44 static const char tstr[] = " [|aoe]";
  45 static const char cstr[] = " (corrupt)";
  46
  47 #define AOE_V1 1
  48 #define ATA_SECTOR_SIZE 512
  49
  50 #define AOEV1_CMD_ISSUE_ATA_COMMAND        0
  51 #define AOEV1_CMD_QUERY_CONFIG_INFORMATION 1
  52 #define AOEV1_CMD_MAC_MASK_LIST            2
  53 #define AOEV1_CMD_RESERVE_RELEASE          3
  54
  55 static const struct tok cmdcode_str[] = {
  56         { AOEV1_CMD_ISSUE_ATA_COMMAND,        "Issue ATA Command"        },
  57         { AOEV1_CMD_QUERY_CONFIG_INFORMATION, "Query Config Information" },
  58         { AOEV1_CMD_MAC_MASK_LIST,            "MAC Mask List"            },
  59         { AOEV1_CMD_RESERVE_RELEASE,          "Reserve/Release"          },
  60         { 0, NULL }
  61 };
  62
  63 #define AOEV1_COMMON_HDR_LEN    10U /* up to but w/o Arg                */
  64 #define AOEV1_ISSUE_ARG_LEN     12U /* up to but w/o Data               */
  65 #define AOEV1_QUERY_ARG_LEN      8U /* up to but w/o Config String      */
  66 #define AOEV1_MAC_ARG_LEN        4U /* up to but w/o Directive 0        */
  67 #define AOEV1_RESERVE_ARG_LEN    2U /* up to but w/o Ethernet address 0 */
  68 #define AOEV1_MAX_CONFSTR_LEN 1024U
  69
  70 #define AOEV1_FLAG_R 0x08
  71 #define AOEV1_FLAG_E 0x04
  72
  73 static const struct tok aoev1_flag_str[] = {
  74         { AOEV1_FLAG_R, "Response" },
  75         { AOEV1_FLAG_E, "Error"    },
  76         { 0x02,         "MBZ-0x02" },
  77         { 0x01,         "MBZ-0x01" },
  78         { 0, NULL }
  79 };
  80
  81 static const struct tok aoev1_errcode_str[] = {
  82         { 1, "Unrecognized command code" },
  83         { 2, "Bad argument parameter"    },
  84         { 3, "Device unavailable"        },
  85         { 4, "Config string present"     },
  86         { 5, "Unsupported version"       },
  87         { 6, "Target is reserved"        },
  88         { 0, NULL }
  89 };
  90
  91 #define AOEV1_AFLAG_E 0x40
  92 #define AOEV1_AFLAG_D 0x10
  93 #define AOEV1_AFLAG_A 0x02
  94 #define AOEV1_AFLAG_W 0x01
  95
  96 static const struct tok aoev1_aflag_str[] = {
  97         { 0x08,          "MBZ-0x08" },
  98         { AOEV1_AFLAG_E, "Ext48"    },
  99         { 0x06,          "MBZ-0x06" },
 100         { AOEV1_AFLAG_D, "Device"   },
 101         { 0x04,          "MBZ-0x04" },
 102         { 0x03,          "MBZ-0x03" },
 103         { AOEV1_AFLAG_A, "Async"    },
 104         { AOEV1_AFLAG_W, "Write"    },
 105         { 0, NULL }
 106 };
 107
 108 static const struct tok aoev1_ccmd_str[] = {
 109         { 0, "read config string"        },
 110         { 1, "test config string"        },
 111         { 2, "test config string prefix" },
 112         { 3, "set config string"         },
 113         { 4, "force set config string"   },
 114         { 0, NULL }
 115 };
 116
 117 static const struct tok aoev1_mcmd_str[] = {
 118         { 0, "Read Mac Mask List" },
 119         { 1, "Edit Mac Mask List" },
 120         { 0, NULL }
 121 };
 122
 123 static const struct tok aoev1_merror_str[] = {
 124         { 1, "Unspecified Error"  },
 125         { 2, "Bad DCmd directive" },
 126         { 3, "Mask list full"     },
 127         { 0, NULL }
 128 };
 129
 130 static const struct tok aoev1_dcmd_str[] = {
 131         { 0, "No Directive"                      },
 132         { 1, "Add mac address to mask list"      },
 133         { 2, "Delete mac address from mask list" },
 134         { 0, NULL }
 135 };
 136
 137 static const struct tok aoev1_rcmd_str[] = {
 138         { 0, "Read reserve list"      },
 139         { 1, "Set reserve list"       },
 140         { 2, "Force set reserve list" },
 141         { 0, NULL }
 142 };
 143
 144 static void
 145 aoev1_issue_print(netdissect_options *ndo,
 146                   const u_char *cp, const u_int len)
 147 {
 148         const u_char *ep = cp + len;
 149
 150         if (len < AOEV1_ISSUE_ARG_LEN)
 151                 goto corrupt;
 152         /* AFlags */
 153         ND_TCHECK2(*cp, 1);
 154         ND_PRINT((ndo, "\n\tAFlags: [%s]", bittok2str(aoev1_aflag_str, "none", *cp)));
 155         cp += 1;
 156         /* Err/Feature */
 157         ND_TCHECK2(*cp, 1);
 158         ND_PRINT((ndo, ", Err/Feature: %u", *cp));
 159         cp += 1;
 160         /* Sector Count (not correlated with the length) */
 161         ND_TCHECK2(*cp, 1);
 162         ND_PRINT((ndo, ", Sector Count: %u", *cp));
 163         cp += 1;
 164         /* Cmd/Status */
 165         ND_TCHECK2(*cp, 1);
 166         ND_PRINT((ndo, ", Cmd/Status: %u", *cp));
 167         cp += 1;
 168         /* lba0 */
 169         ND_TCHECK2(*cp, 1);
 170         ND_PRINT((ndo, "\n\tlba0: %u", *cp));
 171         cp += 1;
 172         /* lba1 */
 173         ND_TCHECK2(*cp, 1);
 174         ND_PRINT((ndo, ", lba1: %u", *cp));
 175         cp += 1;
 176         /* lba2 */
 177         ND_TCHECK2(*cp, 1);
 178         ND_PRINT((ndo, ", lba2: %u", *cp));
 179         cp += 1;
 180         /* lba3 */
 181         ND_TCHECK2(*cp, 1);
 182         ND_PRINT((ndo, ", lba3: %u", *cp));
 183         cp += 1;
 184         /* lba4 */
 185         ND_TCHECK2(*cp, 1);
 186         ND_PRINT((ndo, ", lba4: %u", *cp));
 187         cp += 1;
 188         /* lba5 */
 189         ND_TCHECK2(*cp, 1);
 190         ND_PRINT((ndo, ", lba5: %u", *cp));
 191         cp += 1;
 192         /* Reserved */
 193         ND_TCHECK2(*cp, 2);
 194         cp += 2;
 195         /* Data */
 196         if (len > AOEV1_ISSUE_ARG_LEN)
 197                 ND_PRINT((ndo, "\n\tData: %u bytes", len - AOEV1_ISSUE_ARG_LEN));
 198         return;
 199
 200 corrupt:
 201         ND_PRINT((ndo, "%s", cstr));
 202         ND_TCHECK2(*cp, ep - cp);
 203         return;
 204 trunc:
 205         ND_PRINT((ndo, "%s", tstr));
 206 }
 207
 208 static void
 209 aoev1_query_print(netdissect_options *ndo,
 210                   const u_char *cp, const u_int len)
 211 {
 212         const u_char *ep = cp + len;
 213         uint16_t cslen;
 214
 215         if (len < AOEV1_QUERY_ARG_LEN)
 216                 goto corrupt;
 217         /* Buffer Count */
 218         ND_TCHECK2(*cp, 2);
 219         ND_PRINT((ndo, "\n\tBuffer Count: %u", EXTRACT_16BITS(cp)));
 220         cp += 2;
 221         /* Firmware Version */
 222         ND_TCHECK2(*cp, 2);
 223         ND_PRINT((ndo, ", Firmware Version: %u", EXTRACT_16BITS(cp)));
 224         cp += 2;
 225         /* Sector Count */
 226         ND_TCHECK2(*cp, 1);
 227         ND_PRINT((ndo, ", Sector Count: %u", *cp));
 228         cp += 1;
 229         /* AoE/CCmd */
 230         ND_TCHECK2(*cp, 1);
 231         ND_PRINT((ndo, ", AoE: %u, CCmd: %s", (*cp & 0xF0) >> 4,
 232                   tok2str(aoev1_ccmd_str, "Unknown (0x02x)", *cp & 0x0F)));
 233         cp += 1;
 234         /* Config String Length */
 235         ND_TCHECK2(*cp, 2);
 236         cslen = EXTRACT_16BITS(cp);
 237         cp += 2;
 238         if (cslen > AOEV1_MAX_CONFSTR_LEN || AOEV1_QUERY_ARG_LEN + cslen > len)
 239                 goto corrupt;
 240         /* Config String */
 241         ND_TCHECK2(*cp, cslen);
 242         if (cslen) {
 243                 ND_PRINT((ndo, "\n\tConfig String (length %u): ", cslen));
 244                 if (fn_printn(ndo, cp, cslen, ndo->ndo_snapend))
 245                         goto trunc;
 246         }
 247         return;
 248
 249 corrupt:
 250         ND_PRINT((ndo, "%s", cstr));
 251         ND_TCHECK2(*cp, ep - cp);
 252         return;
 253 trunc:
 254         ND_PRINT((ndo, "%s", tstr));
 255 }
 256
 257 static void
 258 aoev1_mac_print(netdissect_options *ndo,
 259                 const u_char *cp, const u_int len)
 260 {
 261         const u_char *ep = cp + len;
 262         uint8_t dircount, i;
 263
 264         if (len < AOEV1_MAC_ARG_LEN)
 265                 goto corrupt;
 266         /* Reserved */
 267         ND_TCHECK2(*cp, 1);
 268         cp += 1;
 269         /* MCmd */
 270         ND_TCHECK2(*cp, 1);
 271         ND_PRINT((ndo, "\n\tMCmd: %s", tok2str(aoev1_mcmd_str, "Unknown (0x%02x)", *cp)));
 272         cp += 1;
 273         /* MError */
 274         ND_TCHECK2(*cp, 1);
 275         ND_PRINT((ndo, ", MError: %s", tok2str(aoev1_merror_str, "Unknown (0x%02x)", *cp)));
 276         cp += 1;
 277         /* Dir Count */
 278         ND_TCHECK2(*cp, 1);
 279         dircount = *cp;
 280         cp += 1;
 281         ND_PRINT((ndo, ", Dir Count: %u", dircount));
 282         if (AOEV1_MAC_ARG_LEN + dircount * 8 > len)
 283                 goto corrupt;
 284         /* directives */
 285         for (i = 0; i < dircount; i++) {
 286                 /* Reserved */
 287                 ND_TCHECK2(*cp, 1);
 288                 cp += 1;
 289                 /* DCmd */
 290                 ND_TCHECK2(*cp, 1);
 291                 ND_PRINT((ndo, "\n\t DCmd: %s", tok2str(aoev1_dcmd_str, "Unknown (0x%02x)", *cp)));
 292                 cp += 1;
 293                 /* Ethernet Address */
 294                 ND_TCHECK2(*cp, ETHER_ADDR_LEN);
 295                 ND_PRINT((ndo, ", Ethernet Address: %s", etheraddr_string(ndo, cp)));
 296                 cp += ETHER_ADDR_LEN;
 297         }
 298         return;
 299
 300 corrupt:
 301         ND_PRINT((ndo, "%s", cstr));
 302         ND_TCHECK2(*cp, ep - cp);
 303         return;
 304 trunc:
 305         ND_PRINT((ndo, "%s", tstr));
 306 }
 307
 308 static void
 309 aoev1_reserve_print(netdissect_options *ndo,
 310                     const u_char *cp, const u_int len)
 311 {
 312         const u_char *ep = cp + len;
 313         uint8_t nmacs, i;
 314
 315         if (len < AOEV1_RESERVE_ARG_LEN || (len - AOEV1_RESERVE_ARG_LEN) % ETHER_ADDR_LEN)
 316                 goto corrupt;
 317         /* RCmd */
 318         ND_TCHECK2(*cp, 1);
 319         ND_PRINT((ndo, "\n\tRCmd: %s", tok2str(aoev1_rcmd_str, "Unknown (0x%02x)", *cp)));
 320         cp += 1;
 321         /* NMacs (correlated with the length) */
 322         ND_TCHECK2(*cp, 1);
 323         nmacs = *cp;
 324         cp += 1;
 325         ND_PRINT((ndo, ", NMacs: %u", nmacs));
 326         if (AOEV1_RESERVE_ARG_LEN + nmacs * ETHER_ADDR_LEN != len)
 327                 goto corrupt;
 328         /* addresses */
 329         for (i = 0; i < nmacs; i++) {
 330                 ND_PRINT((ndo, "\n\tEthernet Address %u: %s", i, etheraddr_string(ndo, cp)));
 331                 cp += ETHER_ADDR_LEN;
 332         }
 333         return;
 334
 335 corrupt:
 336         ND_PRINT((ndo, "%s", cstr));
 337         ND_TCHECK2(*cp, ep - cp);
 338         return;
 339 trunc:
 340         ND_PRINT((ndo, "%s", tstr));
 341 }
 342
 343 /* cp points to the Ver/Flags octet */
 344 static void
 345 aoev1_print(netdissect_options *ndo,
 346             const u_char *cp, const u_int len)
 347 {
 348         const u_char *ep = cp + len;
 349         uint8_t flags, command;
 350         void (*cmd_decoder)(netdissect_options *, const u_char *, const u_int);
 351
 352         if (len < AOEV1_COMMON_HDR_LEN)
 353                 goto corrupt;
 354         /* Flags */
 355         flags = *cp & 0x0F;
 356         ND_PRINT((ndo, ", Flags: [%s]", bittok2str(aoev1_flag_str, "none", flags)));
 357         cp += 1;
 358         if (! ndo->ndo_vflag)
 359                 return;
 360         /* Error */
 361         ND_TCHECK2(*cp, 1);
 362         if (flags & AOEV1_FLAG_E)
 363                 ND_PRINT((ndo, "\n\tError: %s", tok2str(aoev1_errcode_str, "Invalid (%u)", *cp)));
 364         cp += 1;
 365         /* Major */
 366         ND_TCHECK2(*cp, 2);
 367         ND_PRINT((ndo, "\n\tMajor: 0x%04x", EXTRACT_16BITS(cp)));
 368         cp += 2;
 369         /* Minor */
 370         ND_TCHECK2(*cp, 1);
 371         ND_PRINT((ndo, ", Minor: 0x%02x", *cp));
 372         cp += 1;
 373         /* Command */
 374         ND_TCHECK2(*cp, 1);
 375         command = *cp;
 376         cp += 1;
 377         ND_PRINT((ndo, ", Command: %s", tok2str(cmdcode_str, "Unknown (0x%02x)", command)));
 378         /* Tag */
 379         ND_TCHECK2(*cp, 4);
 380         ND_PRINT((ndo, ", Tag: 0x%08x", EXTRACT_32BITS(cp)));
 381         cp += 4;
 382         /* Arg */
 383         cmd_decoder =
 384                 command == AOEV1_CMD_ISSUE_ATA_COMMAND        ? aoev1_issue_print :
 385                 command == AOEV1_CMD_QUERY_CONFIG_INFORMATION ? aoev1_query_print :
 386                 command == AOEV1_CMD_MAC_MASK_LIST            ? aoev1_mac_print :
 387                 command == AOEV1_CMD_RESERVE_RELEASE          ? aoev1_reserve_print :
 388                 NULL;
 389         if (cmd_decoder != NULL)
 390                 cmd_decoder(ndo, cp, len - AOEV1_COMMON_HDR_LEN);
 391         return;
 392
 393 corrupt:
 394         ND_PRINT((ndo, "%s", cstr));
 395         ND_TCHECK2(*cp, ep - cp);
 396         return;
 397 trunc:
 398         ND_PRINT((ndo, "%s", tstr));
 399 }
 400
 401 void
 402 aoe_print(netdissect_options *ndo,
 403           const u_char *cp, const u_int len)
 404 {
 405         const u_char *ep = cp + len;
 406         uint8_t ver;
 407
 408         ND_PRINT((ndo, "AoE length %u", len));
 409
 410         if (len < 1)
 411                 goto corrupt;
 412         /* Ver/Flags */
 413         ND_TCHECK2(*cp, 1);
 414         ver = (*cp & 0xF0) >> 4;
 415         /* Don't advance cp yet: low order 4 bits are version-specific. */
 416         ND_PRINT((ndo, ", Ver %u", ver));
 417
 418         switch (ver) {
 419                 case AOE_V1:
 420                         aoev1_print(ndo, cp, len);
 421                         break;
 422         }
 423         return;
 424
 425 corrupt:
 426         ND_PRINT((ndo, "%s", cstr));
 427         ND_TCHECK2(*cp, ep - cp);
 428         return;
 429 trunc:
 430         ND_PRINT((ndo, "%s", tstr));
 431 }
 432