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tcpdump/print-fr.c
Guy Harris ea5736c8c6 Process VLAN frames and Alteon jumbo frames in the Ethernet printer. 
Instead of having the Ethernet-type handler process the VLAN and Alteon
jumbo frame Ethernet type values, process them in the Ethernet (and
Linux cooked-mode) dissectors.  This makes it easier for the right MAC
addresses to be printed for those packets.

As part of that, rename ether_encap_print() to ethertype_print() - it
doesn't print encapsulated Ethernet frames, it prints payloads whose
packet type is indicated by an Ethernet type field value - and remove
the no-longer-needed "extracted Ethernet type" argument.  That also lets
us eliminate it from the SNAP print routine.

Make ether_print() take a function, and an argument to pass to that
function, as parameters, so that, for example, the ATM LANE printer can
use it and put the LEC ID into the link-layer headeer printout.
2010-02-21 12:44:53 -08:00

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/*
* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
* 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-fr.c,v 1.51 2006-06-23 22:20:32 hannes Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <string.h>
#include <pcap.h>
#include "addrtoname.h"
#include "interface.h"
#include "ethertype.h"
#include "nlpid.h"
#include "extract.h"
#include "oui.h"
static void frf15_print(const u_char *, u_int);
/*
* the frame relay header has a variable length
*
* the EA bit determines if there is another byte
* in the header
*
* minimum header length is 2 bytes
* maximum header length is 4 bytes
*
* 7 6 5 4 3 2 1 0
* +----+----+----+----+----+----+----+----+
* | DLCI (6 bits) | CR | EA |
* +----+----+----+----+----+----+----+----+
* | DLCI (4 bits) |FECN|BECN| DE | EA |
* +----+----+----+----+----+----+----+----+
* | DLCI (7 bits) | EA |
* +----+----+----+----+----+----+----+----+
* | DLCI (6 bits) |SDLC| EA |
* +----+----+----+----+----+----+----+----+
*/
#define FR_EA_BIT 0x01
#define FR_CR_BIT 0x02000000
#define FR_DE_BIT 0x00020000
#define FR_BECN_BIT 0x00040000
#define FR_FECN_BIT 0x00080000
#define FR_SDLC_BIT 0x00000002
struct tok fr_header_flag_values[] = {
{ FR_CR_BIT, "C!" },
{ FR_DE_BIT, "DE" },
{ FR_BECN_BIT, "BECN" },
{ FR_FECN_BIT, "FECN" },
{ FR_SDLC_BIT, "sdlcore" },
{ 0, NULL }
};
/* FRF.15 / FRF.16 */
#define MFR_B_BIT 0x80
#define MFR_E_BIT 0x40
#define MFR_C_BIT 0x20
#define MFR_BEC_MASK (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT)
#define MFR_CTRL_FRAME (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT)
#define MFR_FRAG_FRAME (MFR_B_BIT | MFR_E_BIT )
struct tok frf_flag_values[] = {
{ MFR_B_BIT, "Begin" },
{ MFR_E_BIT, "End" },
{ MFR_C_BIT, "Control" },
{ 0, NULL }
};
/* Finds out Q.922 address length, DLCI and flags. Returns 0 on success
* save the flags dep. on address length
*/
static int parse_q922_addr(const u_char *p, u_int *dlci,
u_int *addr_len, u_int8_t *flags)
{
if ((p[0] & FR_EA_BIT))
return -1;
*addr_len = 2;
*dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4);
flags[0] = p[0] & 0x02; /* populate the first flag fields */
flags[1] = p[1] & 0x0c;
flags[2] = 0; /* clear the rest of the flags */
flags[3] = 0;
if (p[1] & FR_EA_BIT)
return 0; /* 2-byte Q.922 address */
p += 2;
(*addr_len)++; /* 3- or 4-byte Q.922 address */
if ((p[0] & FR_EA_BIT) == 0) {
*dlci = (*dlci << 7) | (p[0] >> 1);
(*addr_len)++; /* 4-byte Q.922 address */
p++;
}
if ((p[0] & FR_EA_BIT) == 0)
return -1; /* more than 4 bytes of Q.922 address? */
flags[3] = p[0] & 0x02;
*dlci = (*dlci << 6) | (p[0] >> 2);
return 0;
}
char *q922_string(const u_char *p) {
static u_int dlci, addr_len;
static u_int8_t flags[4];
static char buffer[sizeof("DLCI xxxxxxxxxx")];
memset(buffer, 0, sizeof(buffer));
if (parse_q922_addr(p, &dlci, &addr_len, flags) == 0){
snprintf(buffer, sizeof(buffer), "DLCI %u", dlci);
}
return buffer;
}
/* Frame Relay packet structure, with flags and CRC removed
+---------------------------+
| Q.922 Address* |
+-- --+
| |
+---------------------------+
| Control (UI = 0x03) |
+---------------------------+
| Optional Pad (0x00) |
+---------------------------+
| NLPID |
+---------------------------+
| . |
| . |
| . |
| Data |
| . |
| . |
+---------------------------+
* Q.922 addresses, as presently defined, are two octets and
contain a 10-bit DLCI. In some networks Q.922 addresses
may optionally be increased to three or four octets.
*/
static u_int
fr_hdrlen(const u_char *p, u_int addr_len)
{
if (!p[addr_len + 1] /* pad exist */)
return addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */;
else
return addr_len + 1 /* UI */ + 1 /* NLPID */;
}
static void
fr_hdr_print(int length, u_int addr_len, u_int dlci, u_int8_t *flags, u_int16_t nlpid)
{
if (qflag) {
(void)printf("Q.922, DLCI %u, length %u: ",
dlci,
length);
} else {
if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */
(void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ",
addr_len,
dlci,
bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
tok2str(nlpid_values,"unknown", nlpid),
nlpid,
length);
else /* must be an ethertype */
(void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ",
addr_len,
dlci,
bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
tok2str(ethertype_values, "unknown", nlpid),
nlpid,
length);
}
}
u_int
fr_if_print(const struct pcap_pkthdr *h, register const u_char *p)
{
register u_int length = h->len;
register u_int caplen = h->caplen;
TCHECK2(*p, 4); /* minimum frame header length */
if ((length = fr_print(p, length)) == 0)
return (0);
else
return length;
trunc:
printf("[|fr]");
return caplen;
}
u_int
fr_print(register const u_char *p, u_int length)
{
u_int16_t extracted_ethertype;
u_int dlci;
u_int addr_len;
u_int16_t nlpid;
u_int hdr_len;
u_int8_t flags[4];
if (parse_q922_addr(p, &dlci, &addr_len, flags)) {
printf("Q.922, invalid address");
return 0;
}
TCHECK2(*p,addr_len+1+1);
hdr_len = fr_hdrlen(p, addr_len);
TCHECK2(*p,hdr_len);
if (p[addr_len] != 0x03 && dlci != 0) {
/* lets figure out if we have cisco style encapsulation: */
extracted_ethertype = EXTRACT_16BITS(p+addr_len);
if (eflag)
fr_hdr_print(length, addr_len, dlci, flags, extracted_ethertype);
if (ethertype_print(extracted_ethertype,
p+addr_len+ETHERTYPE_LEN,
length-addr_len-ETHERTYPE_LEN,
length-addr_len-ETHERTYPE_LEN) == 0)
/* ether_type not known, probably it wasn't one */
printf("UI %02x! ", p[addr_len]);
else
return hdr_len;
}
if (!p[addr_len + 1]) { /* pad byte should be used with 3-byte Q.922 */
if (addr_len != 3)
printf("Pad! ");
} else if (addr_len == 3)
printf("No pad! ");
nlpid = p[hdr_len - 1];
if (eflag)
fr_hdr_print(length, addr_len, dlci, flags, nlpid);
p += hdr_len;
length -= hdr_len;
switch (nlpid) {
case NLPID_IP:
ip_print(gndo, p, length);
break;
#ifdef INET6
case NLPID_IP6:
ip6_print(p, length);
break;
#endif
case NLPID_CLNP:
case NLPID_ESIS:
case NLPID_ISIS:
isoclns_print(p-1, length+1, length+1); /* OSI printers need the NLPID field */
break;
case NLPID_SNAP:
if (snap_print(p, length, length, 0) == 0) {
/* ether_type not known, print raw packet */
if (!eflag)
fr_hdr_print(length + hdr_len, hdr_len,
dlci, flags, nlpid);
if (!suppress_default_print)
default_print(p - hdr_len, length + hdr_len);
}
break;
case NLPID_Q933:
q933_print(p, length);
break;
case NLPID_MFR:
frf15_print(p, length);
break;
case NLPID_PPP:
ppp_print(p, length);
break;
default:
if (!eflag)
fr_hdr_print(length + hdr_len, addr_len,
dlci, flags, nlpid);
if (!xflag)
default_print(p, length);
}
return hdr_len;
trunc:
printf("[|fr]");
return 0;
}
u_int
mfr_if_print(const struct pcap_pkthdr *h, register const u_char *p)
{
register u_int length = h->len;
register u_int caplen = h->caplen;
TCHECK2(*p, 2); /* minimum frame header length */
if ((length = mfr_print(p, length)) == 0)
return (0);
else
return length;
trunc:
printf("[|mfr]");
return caplen;
}
#define MFR_CTRL_MSG_ADD_LINK 1
#define MFR_CTRL_MSG_ADD_LINK_ACK 2
#define MFR_CTRL_MSG_ADD_LINK_REJ 3
#define MFR_CTRL_MSG_HELLO 4
#define MFR_CTRL_MSG_HELLO_ACK 5
#define MFR_CTRL_MSG_REMOVE_LINK 6
#define MFR_CTRL_MSG_REMOVE_LINK_ACK 7
struct tok mfr_ctrl_msg_values[] = {
{ MFR_CTRL_MSG_ADD_LINK, "Add Link" },
{ MFR_CTRL_MSG_ADD_LINK_ACK, "Add Link ACK" },
{ MFR_CTRL_MSG_ADD_LINK_REJ, "Add Link Reject" },
{ MFR_CTRL_MSG_HELLO, "Hello" },
{ MFR_CTRL_MSG_HELLO_ACK, "Hello ACK" },
{ MFR_CTRL_MSG_REMOVE_LINK, "Remove Link" },
{ MFR_CTRL_MSG_REMOVE_LINK_ACK, "Remove Link ACK" },
{ 0, NULL }
};
#define MFR_CTRL_IE_BUNDLE_ID 1
#define MFR_CTRL_IE_LINK_ID 2
#define MFR_CTRL_IE_MAGIC_NUM 3
#define MFR_CTRL_IE_TIMESTAMP 5
#define MFR_CTRL_IE_VENDOR_EXT 6
#define MFR_CTRL_IE_CAUSE 7
struct tok mfr_ctrl_ie_values[] = {
{ MFR_CTRL_IE_BUNDLE_ID, "Bundle ID"},
{ MFR_CTRL_IE_LINK_ID, "Link ID"},
{ MFR_CTRL_IE_MAGIC_NUM, "Magic Number"},
{ MFR_CTRL_IE_TIMESTAMP, "Timestamp"},
{ MFR_CTRL_IE_VENDOR_EXT, "Vendor Extension"},
{ MFR_CTRL_IE_CAUSE, "Cause"},
{ 0, NULL }
};
#define MFR_ID_STRING_MAXLEN 50
struct ie_tlv_header_t {
u_int8_t ie_type;
u_int8_t ie_len;
};
u_int
mfr_print(register const u_char *p, u_int length)
{
u_int tlen,idx,hdr_len = 0;
u_int16_t sequence_num;
u_int8_t ie_type,ie_len;
const u_int8_t *tptr;
/*
* FRF.16 Link Integrity Control Frame
*
* 7 6 5 4 3 2 1 0
* +----+----+----+----+----+----+----+----+
* | B | E | C=1| 0 0 0 0 | EA |
* +----+----+----+----+----+----+----+----+
* | 0 0 0 0 0 0 0 0 |
* +----+----+----+----+----+----+----+----+
* | message type |
* +----+----+----+----+----+----+----+----+
*/
TCHECK2(*p, 4); /* minimum frame header length */
if ((p[0] & MFR_BEC_MASK) == MFR_CTRL_FRAME && p[1] == 0) {
printf("FRF.16 Control, Flags [%s], %s, length %u",
bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)),
tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",p[2]),
length);
tptr = p + 3;
tlen = length -3;
hdr_len = 3;
if (!vflag)
return hdr_len;
while (tlen>sizeof(struct ie_tlv_header_t)) {
TCHECK2(*tptr, sizeof(struct ie_tlv_header_t));
ie_type=tptr[0];
ie_len=tptr[1];
printf("\n\tIE %s (%u), length %u: ",
tok2str(mfr_ctrl_ie_values,"Unknown",ie_type),
ie_type,
ie_len);
/* infinite loop check */
if (ie_type == 0 || ie_len <= sizeof(struct ie_tlv_header_t))
return hdr_len;
TCHECK2(*tptr,ie_len);
tptr+=sizeof(struct ie_tlv_header_t);
/* tlv len includes header */
ie_len-=sizeof(struct ie_tlv_header_t);
tlen-=sizeof(struct ie_tlv_header_t);
switch (ie_type) {
case MFR_CTRL_IE_MAGIC_NUM:
printf("0x%08x",EXTRACT_32BITS(tptr));
break;
case MFR_CTRL_IE_BUNDLE_ID: /* same message format */
case MFR_CTRL_IE_LINK_ID:
for (idx = 0; idx < ie_len && idx < MFR_ID_STRING_MAXLEN; idx++) {
if (*(tptr+idx) != 0) /* don't print null termination */
safeputchar(*(tptr+idx));
else
break;
}
break;
case MFR_CTRL_IE_TIMESTAMP:
if (ie_len == sizeof(struct timeval)) {
ts_print((const struct timeval *)tptr);
break;
}
/* fall through and hexdump if no unix timestamp */
/*
* FIXME those are the defined IEs that lack a decoder
* you are welcome to contribute code ;-)
*/
case MFR_CTRL_IE_VENDOR_EXT:
case MFR_CTRL_IE_CAUSE:
default:
if (vflag <= 1)
print_unknown_data(tptr,"\n\t ",ie_len);
break;
}
/* do we want to see a hexdump of the IE ? */
if (vflag > 1 )
print_unknown_data(tptr,"\n\t ",ie_len);
tlen-=ie_len;
tptr+=ie_len;
}
return hdr_len;
}
/*
* FRF.16 Fragmentation Frame
*
* 7 6 5 4 3 2 1 0
* +----+----+----+----+----+----+----+----+
* | B | E | C=0|seq. (high 4 bits) | EA |
* +----+----+----+----+----+----+----+----+
* | sequence (low 8 bits) |
* +----+----+----+----+----+----+----+----+
* | DLCI (6 bits) | CR | EA |
* +----+----+----+----+----+----+----+----+
* | DLCI (4 bits) |FECN|BECN| DE | EA |
* +----+----+----+----+----+----+----+----+
*/
sequence_num = (p[0]&0x1e)<<7 | p[1];
/* whole packet or first fragment ? */
if ((p[0] & MFR_BEC_MASK) == MFR_FRAG_FRAME ||
(p[0] & MFR_BEC_MASK) == MFR_B_BIT) {
printf("FRF.16 Frag, seq %u, Flags [%s], ",
sequence_num,
bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)));
hdr_len = 2;
fr_print(p+hdr_len,length-hdr_len);
return hdr_len;
}
/* must be a middle or the last fragment */
printf("FRF.16 Frag, seq %u, Flags [%s]",
sequence_num,
bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)));
print_unknown_data(p,"\n\t",length);
return hdr_len;
trunc:
printf("[|mfr]");
return length;
}
/* an NLPID of 0xb1 indicates a 2-byte
* FRF.15 header
*
* 7 6 5 4 3 2 1 0
* +----+----+----+----+----+----+----+----+
* ~ Q.922 header ~
* +----+----+----+----+----+----+----+----+
* | NLPID (8 bits) | NLPID=0xb1
* +----+----+----+----+----+----+----+----+
* | B | E | C |seq. (high 4 bits) | R |
* +----+----+----+----+----+----+----+----+
* | sequence (low 8 bits) |
* +----+----+----+----+----+----+----+----+
*/
#define FR_FRF15_FRAGTYPE 0x01
static void
frf15_print (const u_char *p, u_int length) {
u_int16_t sequence_num, flags;
flags = p[0]&MFR_BEC_MASK;
sequence_num = (p[0]&0x1e)<<7 | p[1];
printf("FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u",
sequence_num,
bittok2str(frf_flag_values,"none",flags),
p[0]&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End",
length);
/* TODO:
* depending on all permutations of the B, E and C bit
* dig as deep as we can - e.g. on the first (B) fragment
* there is enough payload to print the IP header
* on non (B) fragments it depends if the fragmentation
* model is end-to-end or interface based wether we want to print
* another Q.922 header
*/
}
/*
* Q.933 decoding portion for framerelay specific.
*/
/* Q.933 packet format
Format of Other Protocols
using Q.933 NLPID
+-------------------------------+
| Q.922 Address |
+---------------+---------------+
|Control 0x03 | NLPID 0x08 |
+---------------+---------------+
| L2 Protocol ID |
| octet 1 | octet 2 |
+-------------------------------+
| L3 Protocol ID |
| octet 2 | octet 2 |
+-------------------------------+
| Protocol Data |
+-------------------------------+
| FCS |
+-------------------------------+
*/
/* L2 (Octet 1)- Call Reference Usually is 0x0 */
/*
* L2 (Octet 2)- Message Types definition 1 byte long.
*/
/* Call Establish */
#define MSG_TYPE_ESC_TO_NATIONAL 0x00
#define MSG_TYPE_ALERT 0x01
#define MSG_TYPE_CALL_PROCEEDING 0x02
#define MSG_TYPE_CONNECT 0x07
#define MSG_TYPE_CONNECT_ACK 0x0F
#define MSG_TYPE_PROGRESS 0x03
#define MSG_TYPE_SETUP 0x05
/* Call Clear */
#define MSG_TYPE_DISCONNECT 0x45
#define MSG_TYPE_RELEASE 0x4D
#define MSG_TYPE_RELEASE_COMPLETE 0x5A
#define MSG_TYPE_RESTART 0x46
#define MSG_TYPE_RESTART_ACK 0x4E
/* Status */
#define MSG_TYPE_STATUS 0x7D
#define MSG_TYPE_STATUS_ENQ 0x75
struct tok fr_q933_msg_values[] = {
{ MSG_TYPE_ESC_TO_NATIONAL, "ESC to National" },
{ MSG_TYPE_ALERT, "Alert" },
{ MSG_TYPE_CALL_PROCEEDING, "Call proceeding" },
{ MSG_TYPE_CONNECT, "Connect" },
{ MSG_TYPE_CONNECT_ACK, "Connect ACK" },
{ MSG_TYPE_PROGRESS, "Progress" },
{ MSG_TYPE_SETUP, "Setup" },
{ MSG_TYPE_DISCONNECT, "Disconnect" },
{ MSG_TYPE_RELEASE, "Release" },
{ MSG_TYPE_RELEASE_COMPLETE, "Release Complete" },
{ MSG_TYPE_RESTART, "Restart" },
{ MSG_TYPE_RESTART_ACK, "Restart ACK" },
{ MSG_TYPE_STATUS, "Status Reply" },
{ MSG_TYPE_STATUS_ENQ, "Status Enquiry" },
{ 0, NULL }
};
#define MSG_ANSI_LOCKING_SHIFT 0x95
#define FR_LMI_ANSI_REPORT_TYPE_IE 0x01
#define FR_LMI_ANSI_LINK_VERIFY_IE_91 0x19 /* details? */
#define FR_LMI_ANSI_LINK_VERIFY_IE 0x03
#define FR_LMI_ANSI_PVC_STATUS_IE 0x07
#define FR_LMI_CCITT_REPORT_TYPE_IE 0x51
#define FR_LMI_CCITT_LINK_VERIFY_IE 0x53
#define FR_LMI_CCITT_PVC_STATUS_IE 0x57
struct tok fr_q933_ie_values_codeset5[] = {
{ FR_LMI_ANSI_REPORT_TYPE_IE, "ANSI Report Type" },
{ FR_LMI_ANSI_LINK_VERIFY_IE_91, "ANSI Link Verify" },
{ FR_LMI_ANSI_LINK_VERIFY_IE, "ANSI Link Verify" },
{ FR_LMI_ANSI_PVC_STATUS_IE, "ANSI PVC Status" },
{ FR_LMI_CCITT_REPORT_TYPE_IE, "CCITT Report Type" },
{ FR_LMI_CCITT_LINK_VERIFY_IE, "CCITT Link Verify" },
{ FR_LMI_CCITT_PVC_STATUS_IE, "CCITT PVC Status" },
{ 0, NULL }
};
#define FR_LMI_REPORT_TYPE_IE_FULL_STATUS 0
#define FR_LMI_REPORT_TYPE_IE_LINK_VERIFY 1
#define FR_LMI_REPORT_TYPE_IE_ASYNC_PVC 2
struct tok fr_lmi_report_type_ie_values[] = {
{ FR_LMI_REPORT_TYPE_IE_FULL_STATUS, "Full Status" },
{ FR_LMI_REPORT_TYPE_IE_LINK_VERIFY, "Link verify" },
{ FR_LMI_REPORT_TYPE_IE_ASYNC_PVC, "Async PVC Status" },
{ 0, NULL }
};
/* array of 16 codepages - currently we only support codepage 1,5 */
static struct tok *fr_q933_ie_codesets[] = {
NULL,
fr_q933_ie_values_codeset5,
NULL,
NULL,
NULL,
fr_q933_ie_values_codeset5,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL
};
static int fr_q933_print_ie_codeset5(const struct ie_tlv_header_t *ie_p,
const u_char *p);
typedef int (*codeset_pr_func_t)(const struct ie_tlv_header_t *ie_p,
const u_char *p);
/* array of 16 codepages - currently we only support codepage 1,5 */
static codeset_pr_func_t fr_q933_print_ie_codeset[] = {
NULL,
fr_q933_print_ie_codeset5,
NULL,
NULL,
NULL,
fr_q933_print_ie_codeset5,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL
};
void
q933_print(const u_char *p, u_int length)
{
const u_char *ptemp = p;
struct ie_tlv_header_t *ie_p;
int olen;
int is_ansi = 0;
u_int codeset;
u_int ie_is_known = 0;
if (length < 9) { /* shortest: Q.933a LINK VERIFY */
printf("[|q.933]");
return;
}
codeset = p[2]&0x0f; /* extract the codeset */
if (p[2] == MSG_ANSI_LOCKING_SHIFT) {
is_ansi = 1;
}
printf("%s", eflag ? "" : "Q.933, ");
/* printing out header part */
printf("%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset);
if (p[0]) {
printf(", Call Ref: 0x%02x", p[0]);
}
if (vflag) {
printf(", %s (0x%02x), length %u",
tok2str(fr_q933_msg_values,
"unknown message", p[1]),
p[1],
length);
} else {
printf(", %s",
tok2str(fr_q933_msg_values,
"unknown message 0x%02x", p[1]));
}
olen = length; /* preserve the original length for non verbose mode */
if (length < (u_int)(2 - is_ansi)) {
printf("[|q.933]");
return;
}
length -= 2 + is_ansi;
ptemp += 2 + is_ansi;
/* Loop through the rest of IE */
while (length > sizeof(struct ie_tlv_header_t)) {
ie_p = (struct ie_tlv_header_t *)ptemp;
if (length < sizeof(struct ie_tlv_header_t) ||
length < sizeof(struct ie_tlv_header_t) + ie_p->ie_len) {
if (vflag) { /* not bark if there is just a trailer */
printf("\n[|q.933]");
} else {
printf(", length %u",olen);
}
return;
}
/* lets do the full IE parsing only in verbose mode
* however some IEs (DLCI Status, Link Verify)
* are also interestting in non-verbose mode */
if (vflag) {
printf("\n\t%s IE (0x%02x), length %u: ",
tok2str(fr_q933_ie_codesets[codeset],
"unknown", ie_p->ie_type),
ie_p->ie_type,
ie_p->ie_len);
}
/* sanity check */
if (ie_p->ie_type == 0 || ie_p->ie_len == 0) {
return;
}
if (fr_q933_print_ie_codeset[codeset] != NULL) {
ie_is_known = fr_q933_print_ie_codeset[codeset](ie_p, ptemp);
}
if (vflag >= 1 && !ie_is_known) {
print_unknown_data(ptemp+2,"\n\t",ie_p->ie_len);
}
/* do we want to see a hexdump of the IE ? */
if (vflag> 1 && ie_is_known) {
print_unknown_data(ptemp+2,"\n\t ",ie_p->ie_len);
}
length = length - ie_p->ie_len - 2;
ptemp = ptemp + ie_p->ie_len + 2;
}
if (!vflag) {
printf(", length %u",olen);
}
}
static int
fr_q933_print_ie_codeset5(const struct ie_tlv_header_t *ie_p, const u_char *p)
{
u_int dlci;
switch (ie_p->ie_type) {
case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */
case FR_LMI_CCITT_REPORT_TYPE_IE:
if (vflag) {
printf("%s (%u)",
tok2str(fr_lmi_report_type_ie_values,"unknown",p[2]),
p[2]);
}
return 1;
case FR_LMI_ANSI_LINK_VERIFY_IE: /* fall through */
case FR_LMI_CCITT_LINK_VERIFY_IE:
case FR_LMI_ANSI_LINK_VERIFY_IE_91:
if (!vflag) {
printf(", ");
}
printf("TX Seq: %3d, RX Seq: %3d", p[2], p[3]);
return 1;
case FR_LMI_ANSI_PVC_STATUS_IE: /* fall through */
case FR_LMI_CCITT_PVC_STATUS_IE:
if (!vflag) {
printf(", ");
}
/* now parse the DLCI information element. */
if ((ie_p->ie_len < 3) ||
(p[2] & 0x80) ||
((ie_p->ie_len == 3) && !(p[3] & 0x80)) ||
((ie_p->ie_len == 4) && ((p[3] & 0x80) || !(p[4] & 0x80))) ||
((ie_p->ie_len == 5) && ((p[3] & 0x80) || (p[4] & 0x80) ||
!(p[5] & 0x80))) ||
(ie_p->ie_len > 5) ||
!(p[ie_p->ie_len + 1] & 0x80)) {
printf("Invalid DLCI IE");
}
dlci = ((p[2] & 0x3F) << 4) | ((p[3] & 0x78) >> 3);
if (ie_p->ie_len == 4) {
dlci = (dlci << 6) | ((p[4] & 0x7E) >> 1);
}
else if (ie_p->ie_len == 5) {
dlci = (dlci << 13) | (p[4] & 0x7F) | ((p[5] & 0x7E) >> 1);
}
printf("DLCI %u: status %s%s", dlci,
p[ie_p->ie_len + 1] & 0x8 ? "New, " : "",
p[ie_p->ie_len + 1] & 0x2 ? "Active" : "Inactive");
return 1;
}
return 0;
}
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