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tcpdump/print-cfm.c
Francois-Xavier Le Bail 5cea270318 Remove all storage class specifier 'register' 
Let the compiler do the optimizations (or not) based on build options.

Avoid 'value has been optimized out' messages in gdb using '-O0'.
2017-12-13 19:17:47 +01:00

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/*
* 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 "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;
nd_mac_addr original_mac;
nd_mac_addr target_mac;
};
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,
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_U_1(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,
const u_char *pptr, 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_U_4(msg_ptr.cfm_ccm->sequence),
EXTRACT_BE_U_2(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 = EXTRACT_U_1(namesp);
namesp++;
names_data_remaining--; /* We know this is != 0 */
if (md_nameformat != CFM_CCM_MD_FORMAT_NONE) {
md_namelength = EXTRACT_U_1(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 = EXTRACT_U_1(namesp);
namesp++;
names_data_remaining--; /* We know this is != 0 */
ma_namelength = EXTRACT_U_1(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_U_4(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_U_4(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_TCHECK_1(tptr);
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_TCHECK_LEN(tptr, sizeof(struct cfm_tlv_header_t));
cfm_tlv_len=EXTRACT_BE_U_2(&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_TCHECK_LEN(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_U_1(tptr)),
EXTRACT_U_1(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_U_1(tptr)),
EXTRACT_U_1(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_U_3(tptr)),
EXTRACT_BE_U_3(tptr),
EXTRACT_U_1(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_U_1(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_U_1(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 != MAC_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_U_1(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_U_1(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"));
}
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