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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.
*/
#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.49 2007-10-22 19:37:51 guy Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#include <stdio.h>
#include <pcap.h>
#include <string.h>

#include "interface.h"
#include "extract.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "atm.h"
#include "atmuni31.h"
#include "llc.h"

#include "ether.h"

#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

struct tok oam_f_values[] = {
    { VCI_OAMF4SC, "OAM F4 (segment)" },
    { VCI_OAMF4EC, "OAM F4 (end)" },
    { 0, NULL }
};

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

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

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 }
};

struct tok oam_pm_functype_values[] = {
    { 0x0, "Forward Monitoring" },
    { 0x1, "Backward Reporting" },
    { 0x2, "Monitoring and Reporting" },
    { 0, NULL }
};

struct tok oam_ad_functype_values[] = {
    { 0x0, "Performance Monitoring" },
    { 0x1, "Continuity Check" },
    { 0, NULL }
};

#define OAM_FM_LOOPBACK_INDICATOR_MASK 0x1

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(const u_char *p, int length, int caplen)
{
u_short extracted_ethertype;

if (!llc_print(p, length, caplen, NULL, NULL,
&extracted_ethertype)) {
/* ether_type not known, print raw packet */
if (extracted_ethertype) {
printf("(LLC %s) ",
etherproto_string(htons(extracted_ethertype)));
}
if (!suppress_default_print)
default_print(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(const struct pcap_pkthdr *h, const u_char *p)
{
u_int caplen = h->caplen;
u_int length = h->len;
u_int32_t llchdr;
u_int hdrlen = 0;

if (caplen < 8) {
printf("[|atm]");
return (caplen);
}

        /* Cisco Style NLPID ? */
        if (*p == LLC_UI) {
            if (eflag)
                printf("CNLPID ");
            isoclns_print(p+1, length-1, caplen-1);
            return hdrlen;
        }

/*
* 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 (eflag)
printf("%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(p, length, caplen);
return (hdrlen);
}

/*
* ATM signalling.
*/
static 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(const u_char *p, int caplen)
{
bpf_u_int32 call_ref;

if (caplen < PROTO_POS) {
printf("[|atm]");
return;
}
if (p[PROTO_POS] == Q2931) {
/*
* protocol:Q.2931 for User to Network Interface
* (UNI 3.1) signalling
*/
printf("Q.2931");
if (caplen < MSG_TYPE_POS) {
printf(" [|atm]");
return;
}
printf(":%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]);
printf("CALL_REF:0x%06x", call_ref);
} else {
/* SCCOP with some unknown protocol atop it */
printf("SSCOP, proto %d ", p[PROTO_POS]);
}
}

/*
* Print an ATM PDU (such as an AAL5 PDU).
*/
void
atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
    u_int caplen)
{
if (eflag)
printf("VPI:%u VCI:%u ", vpi, vci);

if (vpi == 0) {
switch (vci) {

case VCI_PPC:
sig_print(p, caplen);
return;

case VCI_BCC:
printf("broadcast sig: ");
return;

case VCI_OAMF4SC: /* fall through */
case VCI_OAMF4EC:
                        oam_print(p, length, ATM_OAM_HEC);
return;

case VCI_METAC:
printf("meta: ");
return;

case VCI_ILMIC:
printf("ilmi: ");
snmp_print(p, length);
return;
}
}

switch (traftype) {

case ATM_LLC:
default:
/*
* Assumes traffic is LLC if unknown.
*/
atm_llc_print(p, length, caplen);
break;

case ATM_LANE:
lane_print(p, length, caplen);
break;
}
}

struct oam_fm_loopback_t {
    u_int8_t loopback_indicator;
    u_int8_t correlation_tag[4];
    u_int8_t loopback_id[12];
    u_int8_t source_id[12];
    u_int8_t unused[16];
};

struct oam_fm_ais_rdi_t {
    u_int8_t failure_type;
    u_int8_t failure_location[16];
    u_int8_t unused[28];
};

int
oam_print (const u_char *p, u_int length, u_int hec) {

    u_int32_t cell_header;
    u_int16_t vpi, vci, cksum, cksum_shouldbe, idx;
    u_int8_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;

    printf("%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 (!vflag) {
        return 1;
    }

    printf("\n\tcell-type %s (%u)",
           tok2str(oam_celltype_values, "unknown", cell_type),
           cell_type);

    if (oam_functype_values[cell_type] == NULL)
        printf(", func-type unknown (%u)", func_type);
    else
        printf(", 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);
        printf("\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));
        printf("\n\tLocation-ID ");
        for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) {
            if (idx % 2) {
                printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->loopback_id[idx]));
            }
        }
        printf("\n\tSource-ID ");
        for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) {
            if (idx % 2) {
                printf("%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);
        printf("\n\tFailure-type 0x%02x", oam_ptr.oam_fm_ais_rdi->failure_type);
        printf("\n\tLocation-ID ");
        for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) {
            if (idx % 2) {
                printf("%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);
    
    printf("\n\tcksum 0x%03x (%scorrect)",
           cksum,
           cksum_shouldbe == 0 ? "" : "in");

    return 1;
}
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