nexmon – Rev 1
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/*
* Copyright (c) 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* 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, (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, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* 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.
*/
#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 "atm.h"
#include "atmuni31.h"
#include "llc.h"
static const char tstr[] = "[|atm]";
#define OAM_CRC10_MASK 0x3ff
#define OAM_PAYLOAD_LEN 48
#define OAM_FUNCTION_SPECIFIC_LEN 45 /* this excludes crc10 and cell-type/function-type */
#define OAM_CELLTYPE_FUNCTYPE_LEN 1
static const struct tok oam_f_values[] = {
{ VCI_OAMF4SC, "OAM F4 (segment)" },
{ VCI_OAMF4EC, "OAM F4 (end)" },
{ 0, NULL }
};
static const struct tok atm_pty_values[] = {
{ 0x0, "user data, uncongested, SDU 0" },
{ 0x1, "user data, uncongested, SDU 1" },
{ 0x2, "user data, congested, SDU 0" },
{ 0x3, "user data, congested, SDU 1" },
{ 0x4, "VCC OAM F5 flow segment" },
{ 0x5, "VCC OAM F5 flow end-to-end" },
{ 0x6, "Traffic Control and resource Mgmt" },
{ 0, NULL }
};
#define OAM_CELLTYPE_FM 0x1
#define OAM_CELLTYPE_PM 0x2
#define OAM_CELLTYPE_AD 0x8
#define OAM_CELLTYPE_SM 0xf
static const struct tok oam_celltype_values[] = {
{ OAM_CELLTYPE_FM, "Fault Management" },
{ OAM_CELLTYPE_PM, "Performance Management" },
{ OAM_CELLTYPE_AD, "activate/deactivate" },
{ OAM_CELLTYPE_SM, "System Management" },
{ 0, NULL }
};
#define OAM_FM_FUNCTYPE_AIS 0x0
#define OAM_FM_FUNCTYPE_RDI 0x1
#define OAM_FM_FUNCTYPE_CONTCHECK 0x4
#define OAM_FM_FUNCTYPE_LOOPBACK 0x8
static const struct tok oam_fm_functype_values[] = {
{ OAM_FM_FUNCTYPE_AIS, "AIS" },
{ OAM_FM_FUNCTYPE_RDI, "RDI" },
{ OAM_FM_FUNCTYPE_CONTCHECK, "Continuity Check" },
{ OAM_FM_FUNCTYPE_LOOPBACK, "Loopback" },
{ 0, NULL }
};
static const struct tok oam_pm_functype_values[] = {
{ 0x0, "Forward Monitoring" },
{ 0x1, "Backward Reporting" },
{ 0x2, "Monitoring and Reporting" },
{ 0, NULL }
};
static const struct tok oam_ad_functype_values[] = {
{ 0x0, "Performance Monitoring" },
{ 0x1, "Continuity Check" },
{ 0, NULL }
};
#define OAM_FM_LOOPBACK_INDICATOR_MASK 0x1
static const struct tok oam_fm_loopback_indicator_values[] = {
{ 0x0, "Reply" },
{ 0x1, "Request" },
{ 0, NULL }
};
static const struct tok *oam_functype_values[16] = {
NULL,
oam_fm_functype_values, /* 1 */
oam_pm_functype_values, /* 2 */
NULL,
NULL,
NULL,
NULL,
NULL,
oam_ad_functype_values, /* 8 */
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL
};
/*
* Print an RFC 1483 LLC-encapsulated ATM frame.
*/
static void
atm_llc_print(netdissect_options *ndo,
const u_char *p, int length, int caplen)
{
u_short extracted_ethertype;
if (!llc_print(ndo, p, length, caplen, NULL, NULL,
&extracted_ethertype)) {
/* ether_type not known, print raw packet */
if (extracted_ethertype) {
ND_PRINT((ndo, "(LLC %s) ",
etherproto_string(htons(extracted_ethertype))));
}
if (!ndo->ndo_suppress_default_print)
ND_DEFAULTPRINT(p, caplen);
}
}
/*
* Given a SAP value, generate the LLC header value for a UI packet
* with that SAP as the source and destination SAP.
*/
#define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03)
/*
* This is the top level routine of the printer. 'p' points
* to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
* 'h->len' is the length of the packet off the wire, and 'h->caplen'
* is the number of bytes actually captured.
*/
u_int
atm_if_print(netdissect_options *ndo,
const struct pcap_pkthdr *h, const u_char *p)
{
u_int caplen = h->caplen;
u_int length = h->len;
uint32_t llchdr;
u_int hdrlen = 0;
if (caplen < 1 || length < 1) {
ND_PRINT((ndo, "%s", tstr));
return (caplen);
}
/* Cisco Style NLPID ? */
if (*p == LLC_UI) {
if (ndo->ndo_eflag)
ND_PRINT((ndo, "CNLPID "));
isoclns_print(ndo, p + 1, length - 1, caplen - 1);
return hdrlen;
}
/*
* Must have at least a DSAP, an SSAP, and the first byte of the
* control field.
*/
if (caplen < 3 || length < 3) {
ND_PRINT((ndo, "%s", tstr));
return (caplen);
}
/*
* Extract the presumed LLC header into a variable, for quick
* testing.
* Then check for a header that's neither a header for a SNAP
* packet nor an RFC 2684 routed NLPID-formatted PDU nor
* an 802.2-but-no-SNAP IP packet.
*/
llchdr = EXTRACT_24BITS(p);
if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
llchdr != LLC_UI_HDR(LLCSAP_IP)) {
/*
* XXX - assume 802.6 MAC header from Fore driver.
*
* Unfortunately, the above list doesn't check for
* all known SAPs, doesn't check for headers where
* the source and destination SAP aren't the same,
* and doesn't check for non-UI frames. It also
* runs the risk of an 802.6 MAC header that happens
* to begin with one of those values being
* incorrectly treated as an 802.2 header.
*
* So is that Fore driver still around? And, if so,
* is it still putting 802.6 MAC headers on ATM
* packets? If so, could it be changed to use a
* new DLT_IEEE802_6 value if we added it?
*/
if (caplen < 20 || length < 20) {
ND_PRINT((ndo, "%s", tstr));
return (caplen);
}
if (ndo->ndo_eflag)
ND_PRINT((ndo, "%08x%08x %08x%08x ",
EXTRACT_32BITS(p),
EXTRACT_32BITS(p+4),
EXTRACT_32BITS(p+8),
EXTRACT_32BITS(p+12)));
p += 20;
length -= 20;
caplen -= 20;
hdrlen += 20;
}
atm_llc_print(ndo, p, length, caplen);
return (hdrlen);
}
/*
* ATM signalling.
*/
static const struct tok msgtype2str[] = {
{ CALL_PROCEED, "Call_proceeding" },
{ CONNECT, "Connect" },
{ CONNECT_ACK, "Connect_ack" },
{ SETUP, "Setup" },
{ RELEASE, "Release" },
{ RELEASE_DONE, "Release_complete" },
{ RESTART, "Restart" },
{ RESTART_ACK, "Restart_ack" },
{ STATUS, "Status" },
{ STATUS_ENQ, "Status_enquiry" },
{ ADD_PARTY, "Add_party" },
{ ADD_PARTY_ACK, "Add_party_ack" },
{ ADD_PARTY_REJ, "Add_party_reject" },
{ DROP_PARTY, "Drop_party" },
{ DROP_PARTY_ACK, "Drop_party_ack" },
{ 0, NULL }
};
static void
sig_print(netdissect_options *ndo,
const u_char *p, int caplen)
{
uint32_t call_ref;
if (caplen < PROTO_POS) {
ND_PRINT((ndo, "%s", tstr));
return;
}
if (p[PROTO_POS] == Q2931) {
/*
* protocol:Q.2931 for User to Network Interface
* (UNI 3.1) signalling
*/
ND_PRINT((ndo, "Q.2931"));
if (caplen < MSG_TYPE_POS) {
ND_PRINT((ndo, " %s", tstr));
return;
}
ND_PRINT((ndo, ":%s ",
tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS])));
/*
* The call reference comes before the message type,
* so if we know we have the message type, which we
* do from the caplen test above, we also know we have
* the call reference.
*/
call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
ND_PRINT((ndo, "CALL_REF:0x%06x", call_ref));
} else {
/* SCCOP with some unknown protocol atop it */
ND_PRINT((ndo, "SSCOP, proto %d ", p[PROTO_POS]));
}
}
/*
* Print an ATM PDU (such as an AAL5 PDU).
*/
void
atm_print(netdissect_options *ndo,
u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
u_int caplen)
{
if (ndo->ndo_eflag)
ND_PRINT((ndo, "VPI:%u VCI:%u ", vpi, vci));
if (vpi == 0) {
switch (vci) {
case VCI_PPC:
sig_print(ndo, p, caplen);
return;
case VCI_BCC:
ND_PRINT((ndo, "broadcast sig: "));
return;
case VCI_OAMF4SC: /* fall through */
case VCI_OAMF4EC:
oam_print(ndo, p, length, ATM_OAM_HEC);
return;
case VCI_METAC:
ND_PRINT((ndo, "meta: "));
return;
case VCI_ILMIC:
ND_PRINT((ndo, "ilmi: "));
snmp_print(ndo, p, length);
return;
}
}
switch (traftype) {
case ATM_LLC:
default:
/*
* Assumes traffic is LLC if unknown.
*/
atm_llc_print(ndo, p, length, caplen);
break;
case ATM_LANE:
lane_print(ndo, p, length, caplen);
break;
}
}
struct oam_fm_loopback_t {
uint8_t loopback_indicator;
uint8_t correlation_tag[4];
uint8_t loopback_id[12];
uint8_t source_id[12];
uint8_t unused[16];
};
struct oam_fm_ais_rdi_t {
uint8_t failure_type;
uint8_t failure_location[16];
uint8_t unused[28];
};
int
oam_print (netdissect_options *ndo,
const u_char *p, u_int length, u_int hec)
{
uint32_t cell_header;
uint16_t vpi, vci, cksum, cksum_shouldbe, idx;
uint8_t cell_type, func_type, payload, clp;
union {
const struct oam_fm_loopback_t *oam_fm_loopback;
const struct oam_fm_ais_rdi_t *oam_fm_ais_rdi;
} oam_ptr;
cell_header = EXTRACT_32BITS(p+hec);
cell_type = ((*(p+ATM_HDR_LEN_NOHEC+hec))>>4) & 0x0f;
func_type = (*(p+ATM_HDR_LEN_NOHEC+hec)) & 0x0f;
vpi = (cell_header>>20)&0xff;
vci = (cell_header>>4)&0xffff;
payload = (cell_header>>1)&0x7;
clp = cell_header&0x1;
ND_PRINT((ndo, "%s, vpi %u, vci %u, payload [ %s ], clp %u, length %u",
tok2str(oam_f_values, "OAM F5", vci),
vpi, vci,
tok2str(atm_pty_values, "Unknown", payload),
clp, length));
if (!ndo->ndo_vflag) {
return 1;
}
ND_PRINT((ndo, "\n\tcell-type %s (%u)",
tok2str(oam_celltype_values, "unknown", cell_type),
cell_type));
if (oam_functype_values[cell_type] == NULL)
ND_PRINT((ndo, ", func-type unknown (%u)", func_type));
else
ND_PRINT((ndo, ", func-type %s (%u)",
tok2str(oam_functype_values[cell_type],"none",func_type),
func_type));
p += ATM_HDR_LEN_NOHEC + hec;
switch (cell_type << 4 | func_type) {
case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_LOOPBACK):
oam_ptr.oam_fm_loopback = (const struct oam_fm_loopback_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
ND_PRINT((ndo, "\n\tLoopback-Indicator %s, Correlation-Tag 0x%08x",
tok2str(oam_fm_loopback_indicator_values,
"Unknown",
oam_ptr.oam_fm_loopback->loopback_indicator & OAM_FM_LOOPBACK_INDICATOR_MASK),
EXTRACT_32BITS(&oam_ptr.oam_fm_loopback->correlation_tag)));
ND_PRINT((ndo, "\n\tLocation-ID "));
for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) {
if (idx % 2) {
ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->loopback_id[idx])));
}
}
ND_PRINT((ndo, "\n\tSource-ID "));
for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) {
if (idx % 2) {
ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->source_id[idx])));
}
}
break;
case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_AIS):
case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_RDI):
oam_ptr.oam_fm_ais_rdi = (const struct oam_fm_ais_rdi_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
ND_PRINT((ndo, "\n\tFailure-type 0x%02x", oam_ptr.oam_fm_ais_rdi->failure_type));
ND_PRINT((ndo, "\n\tLocation-ID "));
for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) {
if (idx % 2) {
ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_ais_rdi->failure_location[idx])));
}
}
break;
case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_CONTCHECK):
/* FIXME */
break;
default:
break;
}
/* crc10 checksum verification */
cksum = EXTRACT_16BITS(p + OAM_CELLTYPE_FUNCTYPE_LEN + OAM_FUNCTION_SPECIFIC_LEN)
& OAM_CRC10_MASK;
cksum_shouldbe = verify_crc10_cksum(0, p, OAM_PAYLOAD_LEN);
ND_PRINT((ndo, "\n\tcksum 0x%03x (%scorrect)",
cksum,
cksum_shouldbe == 0 ? "" : "in"));
return 1;
}