mirrors/tcpdump
0
0
Fork 0
mirror of https://github.com/the-tcpdump-group/tcpdump.git synced 2024-11-30 13:34:04 +08:00
Code Issues Packages Projects Releases Wiki Activity
f411a05060
tcpdump/print-cfm.c

765 lines
24 KiB
C
Raw Blame History

/*
* Copyright (c) 1998-2006 The TCPDUMP project
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code
* distributions retain the above copyright notice and this paragraph
* in its entirety, and (2) distributions including binary code include
* the above copyright notice and this paragraph in its entirety in
* the documentation or other materials provided with the distribution.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*
* Original code by Hannes Gredler (hannes@gredler.at)
*/
/* \summary: IEEE 802.1ag Connectivity Fault Management (CFM) protocols printer */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <netdissect-stdinc.h>
#include <stdio.h>
#include "netdissect.h"
#include "extract.h"
#include "ether.h"
#include "addrtoname.h"
#include "oui.h"
#include "af.h"
struct cfm_common_header_t {
uint8_t mdlevel_version;
uint8_t opcode;
uint8_t flags;
uint8_t first_tlv_offset;
};
#define CFM_VERSION 0
#define CFM_EXTRACT_VERSION(x) (((x)&0x1f))
#define CFM_EXTRACT_MD_LEVEL(x) (((x)&0xe0)>>5)
#define CFM_OPCODE_CCM 1
#define CFM_OPCODE_LBR 2
#define CFM_OPCODE_LBM 3
#define CFM_OPCODE_LTR 4
#define CFM_OPCODE_LTM 5
static const struct tok cfm_opcode_values[] = {
{ CFM_OPCODE_CCM, "Continuity Check Message"},
{ CFM_OPCODE_LBR, "Loopback Reply"},
{ CFM_OPCODE_LBM, "Loopback Message"},
{ CFM_OPCODE_LTR, "Linktrace Reply"},
{ CFM_OPCODE_LTM, "Linktrace Message"},
{ 0, NULL}
};
/*
* Message Formats.
*/
struct cfm_ccm_t {
uint8_t sequence[4];
uint8_t ma_epi[2];
uint8_t names[48];
uint8_t itu_t_y_1731[16];
};
/*
* Timer Bases for the CCM Interval field.
* Expressed in units of seconds.
*/
static const float ccm_interval_base[8] = {0, 0.003333, 0.01, 0.1, 1, 10, 60, 600};
#define CCM_INTERVAL_MIN_MULTIPLIER 3.25
#define CCM_INTERVAL_MAX_MULTIPLIER 3.5
#define CFM_CCM_RDI_FLAG 0x80
#define CFM_EXTRACT_CCM_INTERVAL(x) (((x)&0x07))
#define CFM_CCM_MD_FORMAT_8021 0
#define CFM_CCM_MD_FORMAT_NONE 1
#define CFM_CCM_MD_FORMAT_DNS 2
#define CFM_CCM_MD_FORMAT_MAC 3
#define CFM_CCM_MD_FORMAT_CHAR 4
static const struct tok cfm_md_nameformat_values[] = {
{ CFM_CCM_MD_FORMAT_8021, "IEEE 802.1"},
{ CFM_CCM_MD_FORMAT_NONE, "No MD Name present"},
{ CFM_CCM_MD_FORMAT_DNS, "DNS string"},
{ CFM_CCM_MD_FORMAT_MAC, "MAC + 16Bit Integer"},
{ CFM_CCM_MD_FORMAT_CHAR, "Character string"},
{ 0, NULL}
};
#define CFM_CCM_MA_FORMAT_8021 0
#define CFM_CCM_MA_FORMAT_VID 1
#define CFM_CCM_MA_FORMAT_CHAR 2
#define CFM_CCM_MA_FORMAT_INT 3
#define CFM_CCM_MA_FORMAT_VPN 4
static const struct tok cfm_ma_nameformat_values[] = {
{ CFM_CCM_MA_FORMAT_8021, "IEEE 802.1"},
{ CFM_CCM_MA_FORMAT_VID, "Primary VID"},
{ CFM_CCM_MA_FORMAT_CHAR, "Character string"},
{ CFM_CCM_MA_FORMAT_INT, "16Bit Integer"},
{ CFM_CCM_MA_FORMAT_VPN, "RFC2685 VPN-ID"},
{ 0, NULL}
};
struct cfm_lbm_t {
uint8_t transaction_id[4];
};
struct cfm_ltm_t {
uint8_t transaction_id[4];
uint8_t ttl;
uint8_t original_mac[ETHER_ADDR_LEN];
uint8_t target_mac[ETHER_ADDR_LEN];
};
static const struct tok cfm_ltm_flag_values[] = {
{ 0x80, "Use Forwarding-DB only"},
{ 0, NULL}
};
struct cfm_ltr_t {
uint8_t transaction_id[4];
uint8_t ttl;
uint8_t replay_action;
};
static const struct tok cfm_ltr_flag_values[] = {
{ 0x80, "UseFDB Only"},
{ 0x40, "FwdYes"},
{ 0x20, "Terminal MEP"},
{ 0, NULL}
};
static const struct tok cfm_ltr_replay_action_values[] = {
{ 1, "Exact Match"},
{ 2, "Filtering DB"},
{ 3, "MIP CCM DB"},
{ 0, NULL}
};
#define CFM_TLV_END 0
#define CFM_TLV_SENDER_ID 1
#define CFM_TLV_PORT_STATUS 2
#define CFM_TLV_INTERFACE_STATUS 3
#define CFM_TLV_DATA 4
#define CFM_TLV_REPLY_INGRESS 5
#define CFM_TLV_REPLY_EGRESS 6
#define CFM_TLV_PRIVATE 31
static const struct tok cfm_tlv_values[] = {
{ CFM_TLV_END, "End"},
{ CFM_TLV_SENDER_ID, "Sender ID"},
{ CFM_TLV_PORT_STATUS, "Port status"},
{ CFM_TLV_INTERFACE_STATUS, "Interface status"},
{ CFM_TLV_DATA, "Data"},
{ CFM_TLV_REPLY_INGRESS, "Reply Ingress"},
{ CFM_TLV_REPLY_EGRESS, "Reply Egress"},
{ CFM_TLV_PRIVATE, "Organization Specific"},
{ 0, NULL}
};
/*
* TLVs
*/
struct cfm_tlv_header_t {
uint8_t type;
uint8_t length[2];
};
/* FIXME define TLV formats */
static const struct tok cfm_tlv_port_status_values[] = {
{ 1, "Blocked"},
{ 2, "Up"},
{ 0, NULL}
};
static const struct tok cfm_tlv_interface_status_values[] = {
{ 1, "Up"},
{ 2, "Down"},
{ 3, "Testing"},
{ 5, "Dormant"},
{ 6, "not present"},
{ 7, "lower Layer down"},
{ 0, NULL}
};
#define CFM_CHASSIS_ID_CHASSIS_COMPONENT 1
#define CFM_CHASSIS_ID_INTERFACE_ALIAS 2
#define CFM_CHASSIS_ID_PORT_COMPONENT 3
#define CFM_CHASSIS_ID_MAC_ADDRESS 4
#define CFM_CHASSIS_ID_NETWORK_ADDRESS 5
#define CFM_CHASSIS_ID_INTERFACE_NAME 6
#define CFM_CHASSIS_ID_LOCAL 7
static const struct tok cfm_tlv_senderid_chassisid_values[] = {
{ 0, "Reserved"},
{ CFM_CHASSIS_ID_CHASSIS_COMPONENT, "Chassis component"},
{ CFM_CHASSIS_ID_INTERFACE_ALIAS, "Interface alias"},
{ CFM_CHASSIS_ID_PORT_COMPONENT, "Port component"},
{ CFM_CHASSIS_ID_MAC_ADDRESS, "MAC address"},
{ CFM_CHASSIS_ID_NETWORK_ADDRESS, "Network address"},
{ CFM_CHASSIS_ID_INTERFACE_NAME, "Interface name"},
{ CFM_CHASSIS_ID_LOCAL, "Locally assigned"},
{ 0, NULL}
};
static int
cfm_network_addr_print(netdissect_options *ndo,
register const u_char *tptr, const u_int length)
{
u_int network_addr_type;
u_int hexdump = FALSE;
/*
* Although AFIs are typically 2 octects wide,
* 802.1ab specifies that this field width
* is only one octet.
*/
if (length < 1) {
ND_PRINT((ndo, "\n\t Network Address Type (invalid, no data"));
return hexdump;
}
/* The calling function must make any due ND_TCHECK calls. */
network_addr_type = EXTRACT_8BITS(tptr);
ND_PRINT((ndo, "\n\t Network Address Type %s (%u)",
tok2str(af_values, "Unknown", network_addr_type),
network_addr_type));
/*
* Resolve the passed in Address.
*/
switch(network_addr_type) {
case AFNUM_INET:
if (length != 1 + 4) {
ND_PRINT((ndo, "(invalid IPv4 address length %u)", length - 1));
hexdump = TRUE;
break;
}
ND_PRINT((ndo, ", %s", ipaddr_string(ndo, tptr + 1)));
break;
case AFNUM_INET6:
if (length != 1 + 16) {
ND_PRINT((ndo, "(invalid IPv6 address length %u)", length - 1));
hexdump = TRUE;
break;
}
ND_PRINT((ndo, ", %s", ip6addr_string(ndo, tptr + 1)));
break;
default:
hexdump = TRUE;
break;
}
return hexdump;
}
void
cfm_print(netdissect_options *ndo,
register const u_char *pptr, register u_int length)
{
const struct cfm_common_header_t *cfm_common_header;
const struct cfm_tlv_header_t *cfm_tlv_header;
const uint8_t *tptr, *tlv_ptr;
const uint8_t *namesp;
u_int names_data_remaining;
uint8_t md_nameformat, md_namelength;
const uint8_t *md_name;
uint8_t ma_nameformat, ma_namelength;
const uint8_t *ma_name;
u_int hexdump, tlen, cfm_tlv_len, cfm_tlv_type, ccm_interval;
union {
const struct cfm_ccm_t *cfm_ccm;
const struct cfm_lbm_t *cfm_lbm;
const struct cfm_ltm_t *cfm_ltm;
const struct cfm_ltr_t *cfm_ltr;
} msg_ptr;
tptr=pptr;
cfm_common_header = (const struct cfm_common_header_t *)pptr;
if (length < sizeof(*cfm_common_header))
goto tooshort;
ND_TCHECK(*cfm_common_header);
/*
* Sanity checking of the header.
*/
if (CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version) != CFM_VERSION) {
ND_PRINT((ndo, "CFMv%u not supported, length %u",
CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version), length));
return;
}
ND_PRINT((ndo, "CFMv%u %s, MD Level %u, length %u",
CFM_EXTRACT_VERSION(cfm_common_header->mdlevel_version),
tok2str(cfm_opcode_values, "unknown (%u)", cfm_common_header->opcode),
CFM_EXTRACT_MD_LEVEL(cfm_common_header->mdlevel_version),
length));
/*
* In non-verbose mode just print the opcode and md-level.
*/
if (ndo->ndo_vflag < 1) {
return;
}
ND_PRINT((ndo, "\n\tFirst TLV offset %u", cfm_common_header->first_tlv_offset));
tptr += sizeof(struct cfm_common_header_t);
tlen = length - sizeof(struct cfm_common_header_t);
/*
* Sanity check the first TLV offset.
*/
if (cfm_common_header->first_tlv_offset > tlen) {
ND_PRINT((ndo, " (too large, must be <= %u)", tlen));
return;
}
switch (cfm_common_header->opcode) {
case CFM_OPCODE_CCM:
msg_ptr.cfm_ccm = (const struct cfm_ccm_t *)tptr;
if (cfm_common_header->first_tlv_offset < sizeof(*msg_ptr.cfm_ccm)) {
ND_PRINT((ndo, " (too small 1, must be >= %lu)",
(unsigned long) sizeof(*msg_ptr.cfm_ccm)));
return;
}
if (tlen < sizeof(*msg_ptr.cfm_ccm))
goto tooshort;
ND_TCHECK(*msg_ptr.cfm_ccm);
ccm_interval = CFM_EXTRACT_CCM_INTERVAL(cfm_common_header->flags);
ND_PRINT((ndo, ", Flags [CCM Interval %u%s]",
ccm_interval,
cfm_common_header->flags & CFM_CCM_RDI_FLAG ?
", RDI" : ""));
/*
* Resolve the CCM interval field.
*/
if (ccm_interval) {
ND_PRINT((ndo, "\n\t CCM Interval %.3fs"
", min CCM Lifetime %.3fs, max CCM Lifetime %.3fs",
ccm_interval_base[ccm_interval],
ccm_interval_base[ccm_interval] * CCM_INTERVAL_MIN_MULTIPLIER,
ccm_interval_base[ccm_interval] * CCM_INTERVAL_MAX_MULTIPLIER));
}
ND_PRINT((ndo, "\n\t Sequence Number 0x%08x, MA-End-Point-ID 0x%04x",
EXTRACT_BE_32BITS(msg_ptr.cfm_ccm->sequence),
EXTRACT_BE_16BITS(msg_ptr.cfm_ccm->ma_epi)));
namesp = msg_ptr.cfm_ccm->names;
names_data_remaining = sizeof(msg_ptr.cfm_ccm->names);
/*
* Resolve the MD fields.
*/
md_nameformat = *namesp;
namesp++;
names_data_remaining--; /* We know this is != 0 */
if (md_nameformat != CFM_CCM_MD_FORMAT_NONE) {
md_namelength = *namesp;
namesp++;
names_data_remaining--; /* We know this is !=0 */
ND_PRINT((ndo, "\n\t MD Name Format %s (%u), MD Name length %u",
tok2str(cfm_md_nameformat_values, "Unknown",
md_nameformat),
md_nameformat,
md_namelength));
/*
* -3 for the MA short name format and length and one byte
* of MA short name.
*/
if (md_namelength > names_data_remaining - 3) {
ND_PRINT((ndo, " (too large, must be <= %u)", names_data_remaining - 2));
return;
}
md_name = namesp;
ND_PRINT((ndo, "\n\t MD Name: "));
switch (md_nameformat) {
case CFM_CCM_MD_FORMAT_DNS:
case CFM_CCM_MD_FORMAT_CHAR:
safeputs(ndo, md_name, md_namelength);
break;
case CFM_CCM_MD_FORMAT_MAC:
if (md_namelength == 6) {
ND_PRINT((ndo, "\n\t MAC %s", etheraddr_string(ndo,
md_name)));
} else {
ND_PRINT((ndo, "\n\t MAC (length invalid)"));
}
break;
/* FIXME add printers for those MD formats - hexdump for now */
case CFM_CCM_MA_FORMAT_8021:
default:
print_unknown_data(ndo, md_name, "\n\t ",
md_namelength);
}
namesp += md_namelength;
names_data_remaining -= md_namelength;
} else {
ND_PRINT((ndo, "\n\t MD Name Format %s (%u)",
tok2str(cfm_md_nameformat_values, "Unknown",
md_nameformat),
md_nameformat));
}
/*
* Resolve the MA fields.
*/
ma_nameformat = *namesp;
namesp++;
names_data_remaining--; /* We know this is != 0 */
ma_namelength = *namesp;
namesp++;
names_data_remaining--; /* We know this is != 0 */
ND_PRINT((ndo, "\n\t MA Name-Format %s (%u), MA name length %u",
tok2str(cfm_ma_nameformat_values, "Unknown",
ma_nameformat),
ma_nameformat,
ma_namelength));
if (ma_namelength > names_data_remaining) {
ND_PRINT((ndo, " (too large, must be <= %u)", names_data_remaining));
return;
}
ma_name = namesp;
ND_PRINT((ndo, "\n\t MA Name: "));
switch (ma_nameformat) {
case CFM_CCM_MA_FORMAT_CHAR:
safeputs(ndo, ma_name, ma_namelength);
break;
/* FIXME add printers for those MA formats - hexdump for now */
case CFM_CCM_MA_FORMAT_8021:
case CFM_CCM_MA_FORMAT_VID:
case CFM_CCM_MA_FORMAT_INT:
case CFM_CCM_MA_FORMAT_VPN:
default:
print_unknown_data(ndo, ma_name, "\n\t ", ma_namelength);
}
break;
case CFM_OPCODE_LTM:
msg_ptr.cfm_ltm = (const struct cfm_ltm_t *)tptr;
if (cfm_common_header->first_tlv_offset < sizeof(*msg_ptr.cfm_ltm)) {
ND_PRINT((ndo, " (too small 4, must be >= %lu)",
(unsigned long) sizeof(*msg_ptr.cfm_ltm)));
return;
}
if (tlen < sizeof(*msg_ptr.cfm_ltm))
goto tooshort;
ND_TCHECK(*msg_ptr.cfm_ltm);
ND_PRINT((ndo, ", Flags [%s]",
bittok2str(cfm_ltm_flag_values, "none", cfm_common_header->flags)));
ND_PRINT((ndo, "\n\t Transaction-ID 0x%08x, ttl %u",
EXTRACT_BE_32BITS(msg_ptr.cfm_ltm->transaction_id),
msg_ptr.cfm_ltm->ttl));
ND_PRINT((ndo, "\n\t Original-MAC %s, Target-MAC %s",
etheraddr_string(ndo, msg_ptr.cfm_ltm->original_mac),
etheraddr_string(ndo, msg_ptr.cfm_ltm->target_mac)));
break;
case CFM_OPCODE_LTR:
msg_ptr.cfm_ltr = (const struct cfm_ltr_t *)tptr;
if (cfm_common_header->first_tlv_offset < sizeof(*msg_ptr.cfm_ltr)) {
ND_PRINT((ndo, " (too small 5, must be >= %lu)",
(unsigned long) sizeof(*msg_ptr.cfm_ltr)));
return;
}
if (tlen < sizeof(*msg_ptr.cfm_ltr))
goto tooshort;
ND_TCHECK(*msg_ptr.cfm_ltr);
ND_PRINT((ndo, ", Flags [%s]",
bittok2str(cfm_ltr_flag_values, "none", cfm_common_header->flags)));
ND_PRINT((ndo, "\n\t Transaction-ID 0x%08x, ttl %u",
EXTRACT_BE_32BITS(msg_ptr.cfm_ltr->transaction_id),
msg_ptr.cfm_ltr->ttl));
ND_PRINT((ndo, "\n\t Replay-Action %s (%u)",
tok2str(cfm_ltr_replay_action_values,
"Unknown",
msg_ptr.cfm_ltr->replay_action),
msg_ptr.cfm_ltr->replay_action));
break;
/*
* No message decoder yet.
* Hexdump everything up until the start of the TLVs
*/
case CFM_OPCODE_LBR:
case CFM_OPCODE_LBM:
default:
print_unknown_data(ndo, tptr, "\n\t ",
tlen - cfm_common_header->first_tlv_offset);
break;
}
tptr += cfm_common_header->first_tlv_offset;
tlen -= cfm_common_header->first_tlv_offset;
while (tlen > 0) {
cfm_tlv_header = (const struct cfm_tlv_header_t *)tptr;
/* Enough to read the tlv type ? */
ND_TCHECK2(*tptr, 1);
cfm_tlv_type=cfm_tlv_header->type;
ND_PRINT((ndo, "\n\t%s TLV (0x%02x)",
tok2str(cfm_tlv_values, "Unknown", cfm_tlv_type),
cfm_tlv_type));
if (cfm_tlv_type == CFM_TLV_END) {
/* Length is "Not present if the Type field is 0." */
return;
}
/* do we have the full tlv header ? */
if (tlen < sizeof(struct cfm_tlv_header_t))
goto tooshort;
ND_TCHECK2(*tptr, sizeof(struct cfm_tlv_header_t));
cfm_tlv_len=EXTRACT_BE_16BITS(&cfm_tlv_header->length);
ND_PRINT((ndo, ", length %u", cfm_tlv_len));
tptr += sizeof(struct cfm_tlv_header_t);
tlen -= sizeof(struct cfm_tlv_header_t);
tlv_ptr = tptr;
/* do we have the full tlv ? */
if (tlen < cfm_tlv_len)
goto tooshort;
ND_TCHECK2(*tptr, cfm_tlv_len);
hexdump = FALSE;
switch(cfm_tlv_type) {
case CFM_TLV_PORT_STATUS:
if (cfm_tlv_len < 1) {
ND_PRINT((ndo, " (too short, must be >= 1)"));
return;
}
ND_PRINT((ndo, ", Status: %s (%u)",
tok2str(cfm_tlv_port_status_values, "Unknown", EXTRACT_8BITS(tptr)),
EXTRACT_8BITS(tptr)));
break;
case CFM_TLV_INTERFACE_STATUS:
if (cfm_tlv_len < 1) {
ND_PRINT((ndo, " (too short, must be >= 1)"));
return;
}
ND_PRINT((ndo, ", Status: %s (%u)",
tok2str(cfm_tlv_interface_status_values, "Unknown", EXTRACT_8BITS(tptr)),
EXTRACT_8BITS(tptr)));
break;
case CFM_TLV_PRIVATE:
if (cfm_tlv_len < 4) {
ND_PRINT((ndo, " (too short, must be >= 4)"));
return;
}
ND_PRINT((ndo, ", Vendor: %s (%u), Sub-Type %u",
tok2str(oui_values,"Unknown", EXTRACT_BE_24BITS(tptr)),
EXTRACT_BE_24BITS(tptr),
*(tptr + 3)));
hexdump = TRUE;
break;
case CFM_TLV_SENDER_ID:
{
u_int chassis_id_type, chassis_id_length;
u_int mgmt_addr_length;
if (cfm_tlv_len < 1) {
ND_PRINT((ndo, " (too short, must be >= 1)"));
goto next_tlv;
}
/*
* Get the Chassis ID length and check it.
* IEEE 802.1Q-2014 Section 21.5.3.1
*/
chassis_id_length = EXTRACT_8BITS(tptr);
tptr++;
tlen--;
cfm_tlv_len--;
if (chassis_id_length) {
/*
* IEEE 802.1Q-2014 Section 21.5.3.2: Chassis ID Subtype, references
* IEEE 802.1AB-2005 Section 9.5.2.2, subsequently
* IEEE 802.1AB-2016 Section 8.5.2.2: chassis ID subtype
*/
if (cfm_tlv_len < 1) {
ND_PRINT((ndo, "\n\t (TLV too short)"));
goto next_tlv;
}
chassis_id_type = EXTRACT_8BITS(tptr);
cfm_tlv_len--;
ND_PRINT((ndo, "\n\t Chassis-ID Type %s (%u), Chassis-ID length %u",
tok2str(cfm_tlv_senderid_chassisid_values,
"Unknown",
chassis_id_type),
chassis_id_type,
chassis_id_length));
if (cfm_tlv_len < chassis_id_length) {
ND_PRINT((ndo, "\n\t (TLV too short)"));
goto next_tlv;
}
/* IEEE 802.1Q-2014 Section 21.5.3.3: Chassis ID */
switch (chassis_id_type) {
case CFM_CHASSIS_ID_MAC_ADDRESS:
if (chassis_id_length != ETHER_ADDR_LEN) {
ND_PRINT((ndo, " (invalid MAC address length)"));
hexdump = TRUE;
break;
}
ND_PRINT((ndo, "\n\t MAC %s", etheraddr_string(ndo, tptr + 1)));
break;
case CFM_CHASSIS_ID_NETWORK_ADDRESS:
hexdump |= cfm_network_addr_print(ndo, tptr + 1, chassis_id_length);
break;
case CFM_CHASSIS_ID_INTERFACE_NAME: /* fall through */
case CFM_CHASSIS_ID_INTERFACE_ALIAS:
case CFM_CHASSIS_ID_LOCAL:
case CFM_CHASSIS_ID_CHASSIS_COMPONENT:
case CFM_CHASSIS_ID_PORT_COMPONENT:
safeputs(ndo, tptr + 1, chassis_id_length);
break;
default:
hexdump = TRUE;
break;
}
cfm_tlv_len -= chassis_id_length;
tptr += 1 + chassis_id_length;
tlen -= 1 + chassis_id_length;
}
/*
* Check if there is a Management Address.
* IEEE 802.1Q-2014 Section 21.5.3.4: Management Address Domain Length
* This and all subsequent fields are not present if the TLV length
* allows only the above fields.
*/
if (cfm_tlv_len == 0) {
/* No, there isn't; we're done. */
break;
}
/* Here mgmt_addr_length stands for the management domain length. */
mgmt_addr_length = EXTRACT_8BITS(tptr);
tptr++;
tlen--;
cfm_tlv_len--;
ND_PRINT((ndo, "\n\t Management Address Domain Length %u", mgmt_addr_length));
if (mgmt_addr_length) {
/* IEEE 802.1Q-2014 Section 21.5.3.5: Management Address Domain */
if (cfm_tlv_len < mgmt_addr_length) {
ND_PRINT((ndo, "\n\t (TLV too short)"));
goto next_tlv;
}
cfm_tlv_len -= mgmt_addr_length;
/*
* XXX - this is an OID; print it as such.
*/
hex_print(ndo, "\n\t Management Address Domain: ", tptr, mgmt_addr_length);
tptr += mgmt_addr_length;
tlen -= mgmt_addr_length;
/*
* IEEE 802.1Q-2014 Section 21.5.3.6: Management Address Length
* This field is present if Management Address Domain Length is not 0.
*/
if (cfm_tlv_len < 1) {
ND_PRINT((ndo, " (Management Address Length is missing)"));
hexdump = TRUE;
break;
}
/* Here mgmt_addr_length stands for the management address length. */
mgmt_addr_length = EXTRACT_8BITS(tptr);
tptr++;
tlen--;
cfm_tlv_len--;
ND_PRINT((ndo, "\n\t Management Address Length %u", mgmt_addr_length));
if (mgmt_addr_length) {
/* IEEE 802.1Q-2014 Section 21.5.3.7: Management Address */
if (cfm_tlv_len < mgmt_addr_length) {
ND_PRINT((ndo, "\n\t (TLV too short)"));
return;
}
cfm_tlv_len -= mgmt_addr_length;
/*
* XXX - this is a TransportDomain; print it as such.
*/
hex_print(ndo, "\n\t Management Address: ", tptr, mgmt_addr_length);
tptr += mgmt_addr_length;
tlen -= mgmt_addr_length;
}
}
break;
}
/*
* FIXME those are the defined TLVs that lack a decoder
* you are welcome to contribute code ;-)
*/
case CFM_TLV_DATA:
case CFM_TLV_REPLY_INGRESS:
case CFM_TLV_REPLY_EGRESS:
default:
hexdump = TRUE;
break;
}
/* do we want to see an additional hexdump ? */
if (hexdump || ndo->ndo_vflag > 1)
print_unknown_data(ndo, tlv_ptr, "\n\t ", cfm_tlv_len);
next_tlv:
tptr+=cfm_tlv_len;
tlen-=cfm_tlv_len;
}
return;
tooshort:
ND_PRINT((ndo, "\n\t\t packet is too short"));
return;
trunc:
ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
}
Reference in New Issue View Git Blame Copy Permalink