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wireshark/packet-sll.c

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/* packet-sll.c
* Routines for disassembly of packets from Linux "cooked mode" captures
*
* $Id: packet-sll.c,v 1.21 2003/12/22 20:26:21 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* 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
#include <stdio.h>
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include "packet-sll.h"
#include "packet-ipx.h"
#include "packet-llc.h"
#include <epan/resolv.h>
#include "etypes.h"
static int proto_sll = -1;
static int hf_sll_pkttype = -1;
static int hf_sll_hatype = -1;
static int hf_sll_halen = -1;
static int hf_sll_src_eth = -1;
static int hf_sll_src_other = -1;
static int hf_sll_ltype = -1;
static int hf_sll_etype = -1;
static int hf_sll_trailer = -1;
static gint ett_sll = -1;
/*
* A DLT_LINUX_SLL fake link-layer header.
*/
#define SLL_HEADER_SIZE 16 /* total header length */
#define SLL_ADDRLEN 8 /* length of address field */
/*
* The LINUX_SLL_ values for "sll_pkttype".
*/
#define LINUX_SLL_HOST 0
#define LINUX_SLL_BROADCAST 1
#define LINUX_SLL_MULTICAST 2
#define LINUX_SLL_OTHERHOST 3
#define LINUX_SLL_OUTGOING 4
static const value_string packet_type_vals[] = {
{ LINUX_SLL_HOST, "Unicast to us" },
{ LINUX_SLL_BROADCAST, "Broadcast" },
{ LINUX_SLL_MULTICAST, "Multicast" },
{ LINUX_SLL_OTHERHOST, "Unicast to another host" },
{ LINUX_SLL_OUTGOING, "Sent by us" },
{ 0, NULL }
};
/*
* The LINUX_SLL_ values for "sll_protocol".
*/
#define LINUX_SLL_P_802_3 0x0001 /* Novell 802.3 frames without 802.2 LLC header */
#define LINUX_SLL_P_802_2 0x0004 /* 802.2 frames (not D/I/X Ethernet) */
static const value_string ltype_vals[] = {
{ LINUX_SLL_P_802_3, "Raw 802.3" },
{ LINUX_SLL_P_802_2, "802.2 LLC" },
{ 0, NULL }
};
static dissector_handle_t ipx_handle;
static dissector_handle_t llc_handle;
static dissector_handle_t data_handle;
void
capture_sll(const guchar *pd, int len, packet_counts *ld)
{
guint16 protocol;
if (!BYTES_ARE_IN_FRAME(0, len, SLL_HEADER_SIZE)) {
ld->other++;
return;
}
protocol = pntohs(&pd[14]);
if (protocol <= 1536) { /* yes, 1536 - that's how Linux does it */
/*
* "proto" is *not* a length field, it's a Linux internal
* protocol type.
*/
switch (protocol) {
case LINUX_SLL_P_802_2:
/*
* 802.2 LLC.
*/
capture_llc(pd, len, SLL_HEADER_SIZE, ld);
break;
case LINUX_SLL_P_802_3:
/*
* Novell IPX inside 802.3 with no 802.2 LLC
* header.
*/
capture_ipx(ld);
break;
default:
ld->other++;
break;
}
} else
capture_ethertype(protocol, pd, SLL_HEADER_SIZE, len, ld);
}
static void
dissect_sll(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint16 pkttype;
guint16 protocol;
guint16 hatype, halen;
const guint8 *src;
proto_item *ti;
tvbuff_t *next_tvb;
proto_tree *fh_tree = NULL;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "SLL");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
pkttype = tvb_get_ntohs(tvb, 0);
/*
* Set "pinfo->p2p_dir" if the packet wasn't received
* promiscuously.
*/
switch (pkttype) {
case LINUX_SLL_HOST:
case LINUX_SLL_BROADCAST:
case LINUX_SLL_MULTICAST:
pinfo->p2p_dir = P2P_DIR_RECV;
break;
case LINUX_SLL_OUTGOING:
pinfo->p2p_dir = P2P_DIR_SENT;
break;
}
if (check_col(pinfo->cinfo, COL_INFO))
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(pkttype, packet_type_vals, "Unknown (%u)"));
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_sll, tvb, 0,
SLL_HEADER_SIZE, "Linux cooked capture");
fh_tree = proto_item_add_subtree(ti, ett_sll);
proto_tree_add_item(fh_tree, hf_sll_pkttype, tvb, 0, 2, FALSE);
}
/*
* XXX - check the link-layer address type value?
* For now, we just assume 6 means Ethernet.
*/
hatype = tvb_get_ntohs(tvb, 2);
halen = tvb_get_ntohs(tvb, 4);
if (tree) {
proto_tree_add_uint(fh_tree, hf_sll_hatype, tvb, 2, 2, hatype);
proto_tree_add_uint(fh_tree, hf_sll_halen, tvb, 4, 2, halen);
}
if (halen == 6) {
src = tvb_get_ptr(tvb, 6, 6);
SET_ADDRESS(&pinfo->dl_src, AT_ETHER, 6, src);
SET_ADDRESS(&pinfo->src, AT_ETHER, 6, src);
if (tree) {
proto_tree_add_ether(fh_tree, hf_sll_src_eth, tvb,
6, 6, src);
}
} else {
if (tree) {
proto_tree_add_item(fh_tree, hf_sll_src_other, tvb,
6, halen, FALSE);
}
}
protocol = tvb_get_ntohs(tvb, 14);
if (protocol <= 1536) { /* yes, 1536 - that's how Linux does it */
/*
* "proto" is *not* a length field, it's a Linux internal
* protocol type.
* We therefore cannot say how much of the packet will
* be trailer data.
* XXX - do the same thing we do for packets with Ethertypes?
*/
proto_tree_add_uint(fh_tree, hf_sll_ltype, tvb, 14, 2,
protocol);
next_tvb = tvb_new_subset(tvb, SLL_HEADER_SIZE, -1, -1);
switch (protocol) {
case LINUX_SLL_P_802_2:
/*
* 802.2 LLC.
*/
call_dissector(llc_handle, next_tvb, pinfo, tree);
break;
case LINUX_SLL_P_802_3:
/*
* Novell IPX inside 802.3 with no 802.2 LLC
* header.
*/
call_dissector(ipx_handle, next_tvb, pinfo, tree);
break;
default:
call_dissector(data_handle,next_tvb, pinfo, tree);
break;
}
} else {
ethertype(protocol, tvb, SLL_HEADER_SIZE, pinfo, tree,
fh_tree, hf_sll_etype, hf_sll_trailer, 0);
}
}
void
proto_register_sll(void)
{
static hf_register_info hf[] = {
{ &hf_sll_pkttype,
{ "Packet type", "sll.pkttype", FT_UINT16, BASE_DEC,
VALS(packet_type_vals), 0x0, "Packet type", HFILL }},
/* ARP hardware type? With Linux extensions? */
{ &hf_sll_hatype,
{ "Link-layer address type", "sll.hatype", FT_UINT16, BASE_DEC,
NULL, 0x0, "Link-layer address type", HFILL }},
{ &hf_sll_halen,
{ "Link-layer address length", "sll.halen", FT_UINT16, BASE_DEC,
NULL, 0x0, "Link-layer address length", HFILL }},
/* Source address if it's an Ethernet-type address */
{ &hf_sll_src_eth,
{ "Source", "sll.src.eth", FT_ETHER, BASE_NONE, NULL, 0x0,
"Source link-layer address", HFILL }},
/* Source address if it's not an Ethernet-type address */
{ &hf_sll_src_other,
{ "Source", "sll.src.other", FT_BYTES, BASE_HEX, NULL, 0x0,
"Source link-layer address", HFILL }},
/* if the protocol field is an internal Linux protocol type */
{ &hf_sll_ltype,
{ "Protocol", "sll.ltype", FT_UINT16, BASE_HEX,
VALS(ltype_vals), 0x0, "Linux protocol type", HFILL }},
/* registered here but handled in ethertype.c */
{ &hf_sll_etype,
{ "Protocol", "sll.etype", FT_UINT16, BASE_HEX,
VALS(etype_vals), 0x0, "Ethernet protocol type", HFILL }},
{ &hf_sll_trailer,
{ "Trailer", "sll.trailer", FT_BYTES, BASE_NONE, NULL, 0x0,
"Trailer", HFILL }},
};
static gint *ett[] = {
&ett_sll,
};
proto_sll = proto_register_protocol("Linux cooked-mode capture",
"SLL", "sll" );
proto_register_field_array(proto_sll, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_sll(void)
{
dissector_handle_t sll_handle;
/*
* Get handles for the IPX and LLC dissectors.
*/
llc_handle = find_dissector("llc");
ipx_handle = find_dissector("ipx");
data_handle = find_dissector("data");
sll_handle = create_dissector_handle(dissect_sll, proto_sll);
dissector_add("wtap_encap", WTAP_ENCAP_SLL, sll_handle);
}
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