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NetBSD/dist/tcpdump/print-llc.c

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/* $NetBSD: print-llc.c,v 1.5 2002/05/31 09:45:45 itojun Exp $ */
/*
* 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
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static const char rcsid[] =
"@(#) Header: /tcpdump/master/tcpdump/print-llc.c,v 1.45 2002/04/07 09:50:33 guy Exp";
#else
__RCSID("$NetBSD: print-llc.c,v 1.5 2002/05/31 09:45:45 itojun Exp $");
#endif
#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"
#include "ethertype.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) {
/*
* This is an Ethernet_802.3 IPX frame; it has an
* 802.3 header (i.e., an Ethernet header where the
* type/length field is <= ETHERMTU, i.e. it's a length
* field, not a type field), but has no 802.2 header -
* the IPX packet starts right after the Ethernet header,
* with a signature of two bytes of 0xFF (which is
* LLCSAP_GLOBAL).
*
* (It might also have been an Ethernet_802.3 IPX at
* one time, but got bridged onto another network,
* such as an 802.11 network; this has appeared in at
* least one capture file.)
*/
printf("(NOV-802.3) ");
ipx_print(p, length);
return (1);
}
if (llc.ssap == LLCSAP_8021D && llc.dsap == LLCSAP_8021D) {
stp_print(p, length);
return (1);
}
if (llc.ssap == LLCSAP_IPX && llc.dsap == LLCSAP_IPX &&
llc.llcui == LLC_UI) {
/*
* This is an Ethernet_802.2 IPX frame, with an 802.3
* header and an 802.2 LLC header with the source and
* destination SAPs being the IPX SAP.
*
* Skip DSAP, LSAP, and control field.
*/
printf("(NOV-802.2) ");
p += 3;
length -= 3;
caplen -= 3;
ipx_print(p, length);
return (1);
}
#ifdef TCPDUMP_DO_SMB
if (llc.ssap == LLCSAP_NETBEUI && llc.dsap == LLCSAP_NETBEUI
&& (!(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, length);
return (1);
}
#endif
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) {
u_int32_t orgcode;
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);
orgcode = EXTRACT_24BITS(&llc.llc_orgcode[0]);
et = EXTRACT_16BITS(&llc.llc_ethertype[0]);
switch (orgcode) {
case OUI_ENCAP_ETHER:
case OUI_CISCO_90:
/*
* This is an encapsulated Ethernet packet,
* or a packet bridged by some piece of
* Cisco hardware; the protocol ID is
* an Ethernet protocol type.
*/
ret = ether_encap_print(et, p, length, caplen,
extracted_ethertype);
if (ret)
return (ret);
break;
case OUI_APPLETALK:
if (et == ETHERTYPE_ATALK) {
/*
* No, I have no idea why Apple used one
* of their own OUIs, rather than
* 0x000000, and an Ethernet packet
* type, for Appletalk data packets,
* but used 0x000000 and an Ethernet
* packet type for AARP packets.
*/
ret = ether_encap_print(et, p, length, caplen,
extracted_ethertype);
if (ret)
return (ret);
}
break;
case OUI_CISCO:
if (et == PID_CISCO_CDP) {
cdp_print(p, length, caplen, esrc, edst);
return 1;
}
break;
case OUI_RFC2684:
switch (et) {
case PID_RFC2684_ETH_FCS:
case PID_RFC2684_ETH_NOFCS:
/*
* XXX - remove the last two bytes for
* PID_RFC2684_ETH_FCS?
*/
/*
* Skip the padding.
*/
caplen -= 2;
length -= 2;
p += 2;
/*
* What remains is an Ethernet packet.
*/
ether_print(p, length, caplen);
return (1);
case PID_RFC2684_802_5_FCS:
case PID_RFC2684_802_5_NOFCS:
/*
* XXX - remove the last two bytes for
* PID_RFC2684_ETH_FCS?
*/
/*
* Skip the padding, but not the Access
* Control field.
*/
caplen -= 2;
length -= 2;
p += 2;
/*
* What remains is an 802.5 Token Ring
* packet.
*/
token_print(p, length, caplen);
return (1);
case PID_RFC2684_FDDI_FCS:
case PID_RFC2684_FDDI_NOFCS:
/*
* XXX - remove the last two bytes for
* PID_RFC2684_ETH_FCS?
*/
/*
* Skip the padding.
*/
caplen -= 3;
length -= 3;
p += 3;
/*
* What remains is an FDDI packet.
*/
fddi_print(p, length, caplen);
return (1);
case PID_RFC2684_BPDU:
stp_print(p, length);
return (1);
}
}
}
if ((llc.ssap & ~LLC_GSAP) == llc.dsap) {
if (eflag || esrc == NULL || edst == NULL)
(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 || esrc == NULL || edst == NULL)
(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;
}
}
} 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);
return(1);
}
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