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