433 lines
11 KiB
C
433 lines
11 KiB
C
/*
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* This module implements decoding of the ATA over Ethernet (AoE) protocol
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* according to the following specification:
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* http://support.coraid.com/documents/AoEr11.txt
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*
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* Copyright (c) 2014 The TCPDUMP project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#define NETDISSECT_REWORKED
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include "interface.h"
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#include "extract.h"
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#include "addrtoname.h"
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#include "ether.h"
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static const char tstr[] = " [|aoe]";
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static const char cstr[] = " (corrupt)";
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#define AOE_V1 1
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#define ATA_SECTOR_SIZE 512
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#define AOEV1_CMD_ISSUE_ATA_COMMAND 0
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#define AOEV1_CMD_QUERY_CONFIG_INFORMATION 1
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#define AOEV1_CMD_MAC_MASK_LIST 2
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#define AOEV1_CMD_RESERVE_RELEASE 3
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static const struct tok cmdcode_str[] = {
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{ AOEV1_CMD_ISSUE_ATA_COMMAND, "Issue ATA Command" },
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{ AOEV1_CMD_QUERY_CONFIG_INFORMATION, "Query Config Information" },
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{ AOEV1_CMD_MAC_MASK_LIST, "MAC Mask List" },
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{ AOEV1_CMD_RESERVE_RELEASE, "Reserve/Release" },
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{ 0, NULL }
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};
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#define AOEV1_COMMON_HDR_LEN 10U /* up to but w/o Arg */
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#define AOEV1_ISSUE_ARG_LEN 12U /* up to but w/o Data */
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#define AOEV1_QUERY_ARG_LEN 8U /* up to but w/o Config String */
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#define AOEV1_MAC_ARG_LEN 4U /* up to but w/o Directive 0 */
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#define AOEV1_RESERVE_ARG_LEN 2U /* up to but w/o Ethernet address 0 */
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#define AOEV1_MAX_CONFSTR_LEN 1024U
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#define AOEV1_FLAG_R 0x08
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#define AOEV1_FLAG_E 0x04
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static const struct tok aoev1_flag_str[] = {
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{ AOEV1_FLAG_R, "Response" },
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{ AOEV1_FLAG_E, "Error" },
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{ 0x02, "MBZ-0x02" },
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{ 0x01, "MBZ-0x01" },
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{ 0, NULL }
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};
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static const struct tok aoev1_errcode_str[] = {
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{ 1, "Unrecognized command code" },
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{ 2, "Bad argument parameter" },
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{ 3, "Device unavailable" },
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{ 4, "Config string present" },
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{ 5, "Unsupported version" },
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{ 6, "Target is reserved" },
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{ 0, NULL }
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};
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#define AOEV1_AFLAG_E 0x40
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#define AOEV1_AFLAG_D 0x10
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#define AOEV1_AFLAG_A 0x02
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#define AOEV1_AFLAG_W 0x01
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static const struct tok aoev1_aflag_str[] = {
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{ 0x08, "MBZ-0x08" },
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{ AOEV1_AFLAG_E, "Ext48" },
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{ 0x06, "MBZ-0x06" },
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{ AOEV1_AFLAG_D, "Device" },
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{ 0x04, "MBZ-0x04" },
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{ 0x03, "MBZ-0x03" },
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{ AOEV1_AFLAG_A, "Async" },
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{ AOEV1_AFLAG_W, "Write" },
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{ 0, NULL }
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};
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static const struct tok aoev1_ccmd_str[] = {
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{ 0, "read config string" },
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{ 1, "test config string" },
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{ 2, "test config string prefix" },
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{ 3, "set config string" },
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{ 4, "force set config string" },
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{ 0, NULL }
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};
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static const struct tok aoev1_mcmd_str[] = {
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{ 0, "Read Mac Mask List" },
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{ 1, "Edit Mac Mask List" },
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{ 0, NULL }
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};
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static const struct tok aoev1_merror_str[] = {
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{ 1, "Unspecified Error" },
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{ 2, "Bad DCmd directive" },
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{ 3, "Mask list full" },
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{ 0, NULL }
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};
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static const struct tok aoev1_dcmd_str[] = {
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{ 0, "No Directive" },
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{ 1, "Add mac address to mask list" },
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{ 2, "Delete mac address from mask list" },
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{ 0, NULL }
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};
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static const struct tok aoev1_rcmd_str[] = {
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{ 0, "Read reserve list" },
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{ 1, "Set reserve list" },
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{ 2, "Force set reserve list" },
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{ 0, NULL }
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};
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static void
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aoev1_issue_print(netdissect_options *ndo,
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const u_char *cp, const u_int len)
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{
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const u_char *ep = cp + len;
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if (len < AOEV1_ISSUE_ARG_LEN)
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goto corrupt;
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/* AFlags */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, "\n\tAFlags: [%s]", bittok2str(aoev1_aflag_str, "none", *cp)));
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cp += 1;
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/* Err/Feature */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, ", Err/Feature: %u", *cp));
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cp += 1;
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/* Sector Count (not correlated with the length) */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, ", Sector Count: %u", *cp));
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cp += 1;
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/* Cmd/Status */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, ", Cmd/Status: %u", *cp));
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cp += 1;
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/* lba0 */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, "\n\tlba0: %u", *cp));
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cp += 1;
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/* lba1 */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, ", lba1: %u", *cp));
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cp += 1;
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/* lba2 */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, ", lba2: %u", *cp));
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cp += 1;
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/* lba3 */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, ", lba3: %u", *cp));
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cp += 1;
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/* lba4 */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, ", lba4: %u", *cp));
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cp += 1;
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/* lba5 */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, ", lba5: %u", *cp));
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cp += 1;
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/* Reserved */
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ND_TCHECK2(*cp, 2);
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cp += 2;
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/* Data */
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if (len > AOEV1_ISSUE_ARG_LEN)
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ND_PRINT((ndo, "\n\tData: %u bytes", len - AOEV1_ISSUE_ARG_LEN));
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return;
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corrupt:
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ND_PRINT((ndo, "%s", cstr));
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ND_TCHECK2(*cp, ep - cp);
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return;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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}
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static void
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aoev1_query_print(netdissect_options *ndo,
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const u_char *cp, const u_int len)
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{
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const u_char *ep = cp + len;
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uint16_t cslen;
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if (len < AOEV1_QUERY_ARG_LEN)
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goto corrupt;
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/* Buffer Count */
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ND_TCHECK2(*cp, 2);
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ND_PRINT((ndo, "\n\tBuffer Count: %u", EXTRACT_16BITS(cp)));
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cp += 2;
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/* Firmware Version */
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ND_TCHECK2(*cp, 2);
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ND_PRINT((ndo, ", Firmware Version: %u", EXTRACT_16BITS(cp)));
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cp += 2;
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/* Sector Count */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, ", Sector Count: %u", *cp));
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cp += 1;
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/* AoE/CCmd */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, ", AoE: %u, CCmd: %s", (*cp & 0xF0) >> 4,
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tok2str(aoev1_ccmd_str, "Unknown (0x02x)", *cp & 0x0F)));
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cp += 1;
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/* Config String Length */
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ND_TCHECK2(*cp, 2);
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cslen = EXTRACT_16BITS(cp);
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cp += 2;
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if (cslen > AOEV1_MAX_CONFSTR_LEN || AOEV1_QUERY_ARG_LEN + cslen > len)
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goto corrupt;
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/* Config String */
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ND_TCHECK2(*cp, cslen);
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if (cslen) {
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ND_PRINT((ndo, "\n\tConfig String (length %u): ", cslen));
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if (fn_printn(ndo, cp, cslen, ndo->ndo_snapend))
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goto trunc;
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}
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return;
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corrupt:
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ND_PRINT((ndo, "%s", cstr));
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ND_TCHECK2(*cp, ep - cp);
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return;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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}
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static void
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aoev1_mac_print(netdissect_options *ndo,
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const u_char *cp, const u_int len)
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{
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const u_char *ep = cp + len;
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uint8_t dircount, i;
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if (len < AOEV1_MAC_ARG_LEN)
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goto corrupt;
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/* Reserved */
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ND_TCHECK2(*cp, 1);
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cp += 1;
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/* MCmd */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, "\n\tMCmd: %s", tok2str(aoev1_mcmd_str, "Unknown (0x%02x)", *cp)));
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cp += 1;
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/* MError */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, ", MError: %s", tok2str(aoev1_merror_str, "Unknown (0x%02x)", *cp)));
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cp += 1;
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/* Dir Count */
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ND_TCHECK2(*cp, 1);
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dircount = *cp;
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cp += 1;
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ND_PRINT((ndo, ", Dir Count: %u", dircount));
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if (AOEV1_MAC_ARG_LEN + dircount * 8 > len)
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goto corrupt;
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/* directives */
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for (i = 0; i < dircount; i++) {
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/* Reserved */
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ND_TCHECK2(*cp, 1);
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cp += 1;
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/* DCmd */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, "\n\t DCmd: %s", tok2str(aoev1_dcmd_str, "Unknown (0x%02x)", *cp)));
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cp += 1;
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/* Ethernet Address */
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ND_TCHECK2(*cp, ETHER_ADDR_LEN);
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ND_PRINT((ndo, ", Ethernet Address: %s", etheraddr_string(ndo, cp)));
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cp += ETHER_ADDR_LEN;
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}
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return;
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corrupt:
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ND_PRINT((ndo, "%s", cstr));
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ND_TCHECK2(*cp, ep - cp);
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return;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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}
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static void
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aoev1_reserve_print(netdissect_options *ndo,
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const u_char *cp, const u_int len)
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{
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const u_char *ep = cp + len;
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uint8_t nmacs, i;
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if (len < AOEV1_RESERVE_ARG_LEN || (len - AOEV1_RESERVE_ARG_LEN) % ETHER_ADDR_LEN)
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goto corrupt;
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/* RCmd */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, "\n\tRCmd: %s", tok2str(aoev1_rcmd_str, "Unknown (0x%02x)", *cp)));
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cp += 1;
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/* NMacs (correlated with the length) */
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ND_TCHECK2(*cp, 1);
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nmacs = *cp;
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cp += 1;
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ND_PRINT((ndo, ", NMacs: %u", nmacs));
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if (AOEV1_RESERVE_ARG_LEN + nmacs * ETHER_ADDR_LEN != len)
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goto corrupt;
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/* addresses */
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for (i = 0; i < nmacs; i++) {
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ND_PRINT((ndo, "\n\tEthernet Address %u: %s", i, etheraddr_string(ndo, cp)));
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cp += ETHER_ADDR_LEN;
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}
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return;
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corrupt:
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ND_PRINT((ndo, "%s", cstr));
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ND_TCHECK2(*cp, ep - cp);
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return;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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}
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/* cp points to the Ver/Flags octet */
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static void
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aoev1_print(netdissect_options *ndo,
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const u_char *cp, const u_int len)
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{
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const u_char *ep = cp + len;
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uint8_t flags, command;
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void (*cmd_decoder)(netdissect_options *, const u_char *, const u_int);
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if (len < AOEV1_COMMON_HDR_LEN)
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goto corrupt;
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/* Flags */
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flags = *cp & 0x0F;
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ND_PRINT((ndo, ", Flags: [%s]", bittok2str(aoev1_flag_str, "none", flags)));
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cp += 1;
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if (! ndo->ndo_vflag)
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return;
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/* Error */
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ND_TCHECK2(*cp, 1);
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if (flags & AOEV1_FLAG_E)
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ND_PRINT((ndo, "\n\tError: %s", tok2str(aoev1_errcode_str, "Invalid (%u)", *cp)));
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cp += 1;
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/* Major */
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ND_TCHECK2(*cp, 2);
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ND_PRINT((ndo, "\n\tMajor: 0x%04x", EXTRACT_16BITS(cp)));
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cp += 2;
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/* Minor */
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ND_TCHECK2(*cp, 1);
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ND_PRINT((ndo, ", Minor: 0x%02x", *cp));
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cp += 1;
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/* Command */
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ND_TCHECK2(*cp, 1);
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command = *cp;
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cp += 1;
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ND_PRINT((ndo, ", Command: %s", tok2str(cmdcode_str, "Unknown (0x%02x)", command)));
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/* Tag */
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ND_TCHECK2(*cp, 4);
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ND_PRINT((ndo, ", Tag: 0x%08x", EXTRACT_32BITS(cp)));
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cp += 4;
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/* Arg */
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cmd_decoder =
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command == AOEV1_CMD_ISSUE_ATA_COMMAND ? aoev1_issue_print :
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command == AOEV1_CMD_QUERY_CONFIG_INFORMATION ? aoev1_query_print :
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command == AOEV1_CMD_MAC_MASK_LIST ? aoev1_mac_print :
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command == AOEV1_CMD_RESERVE_RELEASE ? aoev1_reserve_print :
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NULL;
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if (cmd_decoder != NULL)
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cmd_decoder(ndo, cp, len - AOEV1_COMMON_HDR_LEN);
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return;
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corrupt:
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ND_PRINT((ndo, "%s", cstr));
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ND_TCHECK2(*cp, ep - cp);
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return;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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}
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void
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aoe_print(netdissect_options *ndo,
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const u_char *cp, const u_int len)
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{
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const u_char *ep = cp + len;
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uint8_t ver;
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ND_PRINT((ndo, "AoE length %u", len));
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if (len < 1)
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goto corrupt;
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/* Ver/Flags */
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ND_TCHECK2(*cp, 1);
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ver = (*cp & 0xF0) >> 4;
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/* Don't advance cp yet: low order 4 bits are version-specific. */
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ND_PRINT((ndo, ", Ver %u", ver));
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switch (ver) {
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case AOE_V1:
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aoev1_print(ndo, cp, len);
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break;
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}
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return;
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corrupt:
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ND_PRINT((ndo, "%s", cstr));
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ND_TCHECK2(*cp, ep - cp);
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return;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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}
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