269 lines
6.9 KiB
C
269 lines
6.9 KiB
C
/*
|
|
* Copyright (c) 1992, 1993, 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.
|
|
*
|
|
* Code by Matt Thomas, Digital Equipment Corporation
|
|
* with an awful lot of hacking by Jeffrey Mogul, DECWRL
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] =
|
|
"@(#) $Header: /tcpdump/master/tcpdump/print-llc.c,v 1.32 2000/12/18 07:55:36 guy Exp $";
|
|
#endif
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/time.h>
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <ctype.h>
|
|
#include <netdb.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "interface.h"
|
|
#include "addrtoname.h"
|
|
#include "extract.h" /* must come after interface.h */
|
|
|
|
#include "llc.h"
|
|
|
|
static struct tok cmd2str[] = {
|
|
{ LLC_UI, "ui" },
|
|
{ LLC_TEST, "test" },
|
|
{ LLC_XID, "xid" },
|
|
{ LLC_UA, "ua" },
|
|
{ LLC_DISC, "disc" },
|
|
{ LLC_DM, "dm" },
|
|
{ LLC_SABME, "sabme" },
|
|
{ LLC_FRMR, "frmr" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
/*
|
|
* Returns non-zero IFF it succeeds in printing the header
|
|
*/
|
|
int
|
|
llc_print(const u_char *p, u_int length, u_int caplen,
|
|
const u_char *esrc, const u_char *edst, u_short *extracted_ethertype)
|
|
{
|
|
struct llc llc;
|
|
register u_short et;
|
|
u_int16_t control;
|
|
register int ret;
|
|
|
|
if (caplen < 3) {
|
|
(void)printf("[|llc]");
|
|
default_print((u_char *)p, caplen);
|
|
return(0);
|
|
}
|
|
|
|
/* Watch out for possible alignment problems */
|
|
memcpy((char *)&llc, (char *)p, min(caplen, sizeof(llc)));
|
|
|
|
if (llc.ssap == LLCSAP_GLOBAL && llc.dsap == LLCSAP_GLOBAL) {
|
|
ipx_print(p, length);
|
|
return (1);
|
|
}
|
|
|
|
/* Cisco Discovery Protocol - SNAP & ether type 0x2000 */
|
|
if(llc.ssap == LLCSAP_SNAP && llc.dsap == LLCSAP_SNAP &&
|
|
llc.llcui == LLC_UI &&
|
|
llc.ethertype[0] == 0x20 && llc.ethertype[1] == 0x00 ) {
|
|
cdp_print( p, length, caplen, esrc, edst);
|
|
return (1);
|
|
}
|
|
|
|
if (llc.ssap == LLCSAP_8021D && llc.dsap == LLCSAP_8021D) {
|
|
stp_print(p, length);
|
|
return (1);
|
|
}
|
|
if (llc.ssap == 0xf0 && llc.dsap == 0xf0
|
|
&& (!(llc.llcu & LLC_S_FMT) || llc.llcu == LLC_U_FMT)) {
|
|
/*
|
|
* we don't actually have a full netbeui parser yet, but the
|
|
* smb parser can handle many smb-in-netbeui packets, which
|
|
* is very useful, so we call that
|
|
*
|
|
* We don't call it for S frames, however, just I frames
|
|
* (which are frames that don't have the low-order bit,
|
|
* LLC_S_FMT, set in the first byte of the control field)
|
|
* and UI frames (whose control field is just 3, LLC_U_FMT).
|
|
*/
|
|
|
|
/*
|
|
* Skip the DSAP and LSAP.
|
|
*/
|
|
p += 2;
|
|
length -= 2;
|
|
caplen -= 2;
|
|
|
|
/*
|
|
* OK, what type of LLC frame is this? The length
|
|
* of the control field depends on that - I frames
|
|
* have a two-byte control field, and U frames have
|
|
* a one-byte control field.
|
|
*/
|
|
if (llc.llcu == LLC_U_FMT) {
|
|
control = llc.llcu;
|
|
p += 1;
|
|
length -= 1;
|
|
caplen -= 1;
|
|
} else {
|
|
/*
|
|
* The control field in I and S frames is
|
|
* little-endian.
|
|
*/
|
|
control = EXTRACT_LE_16BITS(&llc.llcu);
|
|
p += 2;
|
|
length -= 2;
|
|
caplen -= 2;
|
|
}
|
|
netbeui_print(control, p, p + min(caplen, length));
|
|
return (1);
|
|
}
|
|
if (llc.ssap == LLCSAP_ISONS && llc.dsap == LLCSAP_ISONS
|
|
&& llc.llcui == LLC_UI) {
|
|
isoclns_print(p + 3, length - 3, caplen - 3, esrc, edst);
|
|
return (1);
|
|
}
|
|
|
|
if (llc.ssap == LLCSAP_SNAP && llc.dsap == LLCSAP_SNAP
|
|
&& llc.llcui == LLC_UI) {
|
|
if (caplen < sizeof(llc)) {
|
|
(void)printf("[|llc-snap]");
|
|
default_print((u_char *)p, caplen);
|
|
return (0);
|
|
}
|
|
if (vflag)
|
|
(void)printf("snap %s ", protoid_string(llc.llcpi));
|
|
|
|
caplen -= sizeof(llc);
|
|
length -= sizeof(llc);
|
|
p += sizeof(llc);
|
|
|
|
/* This is an encapsulated Ethernet packet */
|
|
et = EXTRACT_16BITS(&llc.ethertype[0]);
|
|
ret = ether_encap_print(et, p, length, caplen,
|
|
extracted_ethertype);
|
|
if (ret)
|
|
return (ret);
|
|
}
|
|
|
|
if ((llc.ssap & ~LLC_GSAP) == llc.dsap) {
|
|
if (eflag)
|
|
(void)printf("%s ", llcsap_string(llc.dsap));
|
|
else
|
|
(void)printf("%s > %s %s ",
|
|
etheraddr_string(esrc),
|
|
etheraddr_string(edst),
|
|
llcsap_string(llc.dsap));
|
|
} else {
|
|
if (eflag)
|
|
(void)printf("%s > %s ",
|
|
llcsap_string(llc.ssap & ~LLC_GSAP),
|
|
llcsap_string(llc.dsap));
|
|
else
|
|
(void)printf("%s %s > %s %s ",
|
|
etheraddr_string(esrc),
|
|
llcsap_string(llc.ssap & ~LLC_GSAP),
|
|
etheraddr_string(edst),
|
|
llcsap_string(llc.dsap));
|
|
}
|
|
|
|
if ((llc.llcu & LLC_U_FMT) == LLC_U_FMT) {
|
|
u_int16_t cmd;
|
|
const char *m;
|
|
char f;
|
|
|
|
cmd = LLC_U_CMD(llc.llcu);
|
|
m = tok2str(cmd2str, "%02x", cmd);
|
|
switch ((llc.ssap & LLC_GSAP) | (llc.llcu & LLC_U_POLL)) {
|
|
case 0: f = 'C'; break;
|
|
case LLC_GSAP: f = 'R'; break;
|
|
case LLC_U_POLL: f = 'P'; break;
|
|
case LLC_GSAP|LLC_U_POLL: f = 'F'; break;
|
|
default: f = '?'; break;
|
|
}
|
|
|
|
printf("%s/%c", m, f);
|
|
|
|
p += 3;
|
|
length -= 3;
|
|
caplen -= 3;
|
|
|
|
if ((llc.llcu & ~LLC_U_POLL) == LLC_XID) {
|
|
if (*p == LLC_XID_FI) {
|
|
printf(": %02x %02x", p[1], p[2]);
|
|
p += 3;
|
|
length -= 3;
|
|
caplen -= 3;
|
|
}
|
|
}
|
|
|
|
if (cmd == LLC_UI && f == 'C') {
|
|
/*
|
|
* we don't have a proper ipx decoder yet, but there
|
|
* is a partial one in the smb code
|
|
*/
|
|
ipx_netbios_print(p,p+min(caplen,length));
|
|
}
|
|
} else {
|
|
char f;
|
|
|
|
/*
|
|
* The control field in I and S frames is little-endian.
|
|
*/
|
|
control = EXTRACT_LE_16BITS(&llc.llcu);
|
|
switch ((llc.ssap & LLC_GSAP) | (control & LLC_IS_POLL)) {
|
|
case 0: f = 'C'; break;
|
|
case LLC_GSAP: f = 'R'; break;
|
|
case LLC_IS_POLL: f = 'P'; break;
|
|
case LLC_GSAP|LLC_IS_POLL: f = 'F'; break;
|
|
default: f = '?'; break;
|
|
}
|
|
|
|
if ((control & LLC_S_FMT) == LLC_S_FMT) {
|
|
static char *llc_s[] = { "rr", "rej", "rnr", "03" };
|
|
(void)printf("%s (r=%d,%c)",
|
|
llc_s[LLC_S_CMD(control)],
|
|
LLC_IS_NR(control),
|
|
f);
|
|
} else {
|
|
(void)printf("I (s=%d,r=%d,%c)",
|
|
LLC_I_NS(control),
|
|
LLC_IS_NR(control),
|
|
f);
|
|
}
|
|
p += 4;
|
|
length -= 4;
|
|
caplen -= 4;
|
|
}
|
|
(void)printf(" len=%d", length);
|
|
if (caplen > 0 && !qflag) {
|
|
default_print_unaligned(p, caplen);
|
|
}
|
|
return(1);
|
|
}
|