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/* packet-llc.c
* Routines for IEEE 802.2 LLC layer
* Gilbert Ramirez <gram@verdict.uthscsa.edu>
*
* $Id: packet-llc.c,v 1.14 1999/03/23 03:14:39 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@unicom.net>
* Copyright 1998 Gerald Combs
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include <glib.h>
#include "packet.h"
typedef void (capture_func_t)(const u_char *, int, guint32, packet_counts *);
typedef void (dissect_func_t)(const u_char *, int, frame_data *, proto_tree *);
struct sap_info {
guint8 sap;
capture_func_t *capture_func;
dissect_func_t *dissect_func;
char *text;
};
static struct sap_info saps[] = {
{ 0x00, NULL, NULL, "NULL LSAP" },
{ 0x02, NULL, NULL, "LLC Sub-Layer Management Individual" },
{ 0x03, NULL, NULL, "LLC Sub-Layer Management Group" },
{ 0x04, NULL, NULL, "SNA Path Control Individual" },
{ 0x05, NULL, NULL, "SNA Path Control Group" },
{ 0x06, capture_ip, dissect_ip, "TCP/IP" },
{ 0x08, NULL, NULL, "SNA" },
{ 0x0C, NULL, NULL, "SNA" },
{ 0x42, NULL, NULL, "Spanning Tree BPDU" },
{ 0x7F, NULL, NULL, "ISO 802.2" },
{ 0x80, NULL, NULL, "XNS" },
{ 0xAA, NULL, NULL, "SNAP" },
/*{ 0xBA, NULL, dissect_vines, "Banyan Vines" },
{ 0xBC, NULL, dissect_vines, "Banyan Vines" },*/
{ 0xBA, NULL, NULL, "Banyan Vines" },
{ 0xBC, NULL, NULL, "Banyan Vines" },
{ 0xE0, NULL, dissect_ipx, "NetWare" },
{ 0xF0, NULL, NULL, "NetBIOS" },
{ 0xF4, NULL, NULL, "IBM Net Management Individual" },
{ 0xF5, NULL, NULL, "IBM Net Management Group" },
{ 0xF8, NULL, NULL, "Remote Program Load" },
{ 0xFC, NULL, NULL, "Remote Program Load" },
{ 0xFE, NULL, dissect_osi, "ISO Network Layer" },
{ 0xFF, NULL, NULL, "Global LSAP" },
{ 0x00, NULL, NULL, NULL }
};
static char*
sap_text(u_char sap) {
int i=0;
while (saps[i].text != NULL) {
if (saps[i].sap == sap) {
return saps[i].text;
}
i++;
}
return "Unknown";
}
static capture_func_t *
sap_capture_func(u_char sap) {
int i=0;
while (saps[i].text != NULL) {
if (saps[i].sap == sap) {
return saps[i].capture_func;
}
i++;
}
return NULL;
}
static dissect_func_t *
sap_dissect_func(u_char sap) {
int i=0;
while (saps[i].text != NULL) {
if (saps[i].sap == sap) {
return saps[i].dissect_func;
}
i++;
}
return dissect_data;
}
static char*
llc_org(const u_char *ptr) {
unsigned long org = (ptr[0] << 16) | (ptr[1] << 8) | ptr[2];
char *llc_org[1] = {
"Encapsulated Ethernet"};
if (org > 0) {
return "Unknown";
}
else {
return llc_org[org];
}
}
void
capture_llc(const u_char *pd, int offset, guint32 cap_len, packet_counts *ld) {
guint16 etype;
int is_snap;
capture_func_t *capture;
is_snap = (pd[offset] == 0xAA) && (pd[offset+1] == 0xAA);
if (is_snap) {
etype = (pd[offset+6] << 8) | pd[offset+7];
offset += 8;
capture_ethertype(etype, offset, pd, cap_len, ld);
}
else {
capture = sap_capture_func(pd[offset]);
/* non-SNAP */
offset += 3;
if (capture) {
capture(pd, offset, cap_len, ld);
}
else {
ld->other++;
}
}
}
void
dissect_llc(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
proto_tree *llc_tree = NULL;
proto_item *ti;
guint16 etype;
int is_snap;
dissect_func_t *dissect;
/* LLC Strings */
char *llc_ctrl[4] = {
"Information Transfer", "Supervisory",
"", "Unnumbered Information" };
is_snap = (pd[offset] == 0xAA) && (pd[offset+1] == 0xAA);
if (check_col(fd, COL_PROTOCOL)) {
col_add_str(fd, COL_PROTOCOL, "LLC");
}
if (tree) {
ti = proto_tree_add_item(tree, offset, (is_snap ? 8 : 3),
"Logical-Link Control");
llc_tree = proto_tree_new();
proto_item_add_subtree(ti, llc_tree, ETT_LLC);
proto_tree_add_item(llc_tree, offset, 1, "DSAP: %s (0x%02X)",
sap_text(pd[offset]), pd[offset]);
proto_tree_add_item(llc_tree, offset+1, 1, "SSAP: %s (0x%02X)",
sap_text(pd[offset+1]), pd[offset+1]);
proto_tree_add_item(llc_tree, offset+2, 1, "Control: %s",
llc_ctrl[pd[offset+2] & 3]);
}
if (is_snap) {
if (check_col(fd, COL_INFO)) {
col_add_str(fd, COL_INFO, "802.2 LLC (SNAP)");
}
if (tree) {
proto_tree_add_item(llc_tree, offset+3, 3,
"Organization Code: %s (%02X-%02X-%02X)",
llc_org(&pd[offset+3]),
pd[offset+3], pd[offset+4], pd[offset+5]);
}
etype = (pd[offset+6] << 8) | pd[offset+7];
offset += 8;
ethertype(etype, offset, pd, fd, tree, llc_tree);
}
else {
if (check_col(fd, COL_INFO)) {
col_add_fstr(fd, COL_INFO, "802.2 LLC (%s)", sap_text(pd[offset]));
}
dissect = sap_dissect_func(pd[offset]);
/* non-SNAP */
offset += 3;
if (dissect) {
dissect(pd, offset, fd, tree);
}
else {
dissect_data(pd, offset, fd, tree);
}
}
}
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