2aa31bea47
"etypes.h". svn path=/trunk/; revision=3314
290 lines
7.5 KiB
C
290 lines
7.5 KiB
C
/* packet-sll.c
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* Routines for disassembly of packets from Linux "cooked mode" captures
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*
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* $Id: packet-sll.c,v 1.9 2001/04/17 06:43:19 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <glib.h>
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#include "packet.h"
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#include "packet-ipx.h"
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#include "packet-llc.h"
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#include "resolv.h"
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#include "etypes.h"
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static int proto_sll = -1;
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static int hf_sll_pkttype = -1;
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static int hf_sll_hatype = -1;
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static int hf_sll_halen = -1;
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static int hf_sll_src_eth = -1;
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static int hf_sll_src_other = -1;
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static int hf_sll_ltype = -1;
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static int hf_sll_etype = -1;
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static int hf_sll_trailer = -1;
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static gint ett_sll = -1;
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/*
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* A DLT_LINUX_SLL fake link-layer header.
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*/
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#define SLL_HEADER_SIZE 16 /* total header length */
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#define SLL_ADDRLEN 8 /* length of address field */
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/*
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* The LINUX_SLL_ values for "sll_pkttype".
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*/
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#define LINUX_SLL_HOST 0
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#define LINUX_SLL_BROADCAST 1
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#define LINUX_SLL_MULTICAST 2
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#define LINUX_SLL_OTHERHOST 3
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#define LINUX_SLL_OUTGOING 4
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static const value_string packet_type_vals[] = {
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{ LINUX_SLL_HOST, "Unicast to us" },
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{ LINUX_SLL_BROADCAST, "Broadcast" },
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{ LINUX_SLL_MULTICAST, "Multicast" },
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{ LINUX_SLL_OTHERHOST, "Unicast to another host" },
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{ LINUX_SLL_OUTGOING, "Sent by us" },
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{ 0, NULL }
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};
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/*
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* The LINUX_SLL_ values for "sll_protocol".
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*/
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#define LINUX_SLL_P_802_3 0x0001 /* Novell 802.3 frames without 802.2 LLC header */
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#define LINUX_SLL_P_802_2 0x0004 /* 802.2 frames (not D/I/X Ethernet) */
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static const value_string ltype_vals[] = {
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{ LINUX_SLL_P_802_3, "Raw 802.3" },
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{ LINUX_SLL_P_802_2, "802.2 LLC" },
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{ 0, NULL }
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};
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static dissector_handle_t ipx_handle;
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static dissector_handle_t llc_handle;
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void
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capture_sll(const u_char *pd, packet_counts *ld)
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{
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guint16 protocol;
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if (!BYTES_ARE_IN_FRAME(0, SLL_HEADER_SIZE)) {
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ld->other++;
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return;
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}
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protocol = pntohs(&pd[14]);
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if (protocol <= 1536) { /* yes, 1536 - that's how Linux does it */
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/*
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* "proto" is *not* a length field, it's a Linux internal
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* protocol type.
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*/
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switch (protocol) {
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case LINUX_SLL_P_802_2:
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/*
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* 802.2 LLC.
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*/
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capture_llc(pd, SLL_HEADER_SIZE, ld);
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break;
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case LINUX_SLL_P_802_3:
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/*
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* Novell IPX inside 802.3 with no 802.2 LLC
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* header.
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*/
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capture_ipx(pd, SLL_HEADER_SIZE, ld);
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break;
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default:
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ld->other++;
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break;
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}
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} else
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capture_ethertype(protocol, SLL_HEADER_SIZE, pd, ld);
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}
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static void
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dissect_sll(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint16 pkttype;
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guint16 protocol;
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guint16 hatype, halen;
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const guint8 *src;
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proto_item *ti;
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tvbuff_t *next_tvb;
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proto_tree *fh_tree = NULL;
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if (check_col(pinfo->fd, COL_PROTOCOL))
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col_set_str(pinfo->fd, COL_PROTOCOL, "SLL");
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if (check_col(pinfo->fd, COL_INFO))
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col_clear(pinfo->fd, COL_INFO);
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pkttype = tvb_get_ntohs(tvb, 0);
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if (check_col(pinfo->fd, COL_INFO))
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col_add_str(pinfo->fd, COL_INFO,
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val_to_str(pkttype, packet_type_vals, "Unknown (%u)"));
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_sll, tvb, 0,
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SLL_HEADER_SIZE, "Linux cooked capture");
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fh_tree = proto_item_add_subtree(ti, ett_sll);
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proto_tree_add_item(fh_tree, hf_sll_pkttype, tvb, 0, 2, FALSE);
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}
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/*
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* XXX - check the link-layer address type value?
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* For now, we just assume 6 means Ethernet.
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*/
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hatype = tvb_get_ntohs(tvb, 2);
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halen = tvb_get_ntohs(tvb, 4);
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if (tree) {
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proto_tree_add_uint(fh_tree, hf_sll_hatype, tvb, 2, 2, hatype);
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proto_tree_add_uint(fh_tree, hf_sll_halen, tvb, 4, 2, halen);
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}
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if (halen == 6) {
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src = tvb_get_ptr(tvb, 6, 6);
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SET_ADDRESS(&pinfo->dl_src, AT_ETHER, 6, src);
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SET_ADDRESS(&pinfo->src, AT_ETHER, 6, src);
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if (tree) {
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proto_tree_add_ether(fh_tree, hf_sll_src_eth, tvb,
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6, 6, src);
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}
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} else {
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if (tree) {
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proto_tree_add_bytes(fh_tree, hf_sll_src_other, tvb,
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6, halen, tvb_get_ptr(tvb, 6, halen));
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}
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}
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protocol = tvb_get_ntohs(tvb, 14);
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if (protocol <= 1536) { /* yes, 1536 - that's how Linux does it */
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/*
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* "proto" is *not* a length field, it's a Linux internal
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* protocol type.
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* We therefore cannot say how much of the packet will
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* be trailer data.
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* XXX - do the same thing we do for packets with Ethertypes?
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*/
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proto_tree_add_uint(fh_tree, hf_sll_ltype, tvb, 14, 2,
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protocol);
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next_tvb = tvb_new_subset(tvb, SLL_HEADER_SIZE, -1, -1);
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switch (protocol) {
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case LINUX_SLL_P_802_2:
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/*
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* 802.2 LLC.
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*/
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call_dissector(llc_handle, next_tvb, pinfo, tree);
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break;
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case LINUX_SLL_P_802_3:
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/*
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* Novell IPX inside 802.3 with no 802.2 LLC
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* header.
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*/
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call_dissector(ipx_handle, next_tvb, pinfo, tree);
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break;
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default:
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dissect_data(next_tvb, 0, pinfo, tree);
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break;
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}
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} else {
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ethertype(protocol, tvb, SLL_HEADER_SIZE, pinfo, tree,
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fh_tree, hf_sll_etype, hf_sll_trailer);
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}
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}
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void
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proto_register_sll(void)
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{
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static hf_register_info hf[] = {
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{ &hf_sll_pkttype,
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{ "Packet type", "sll.pkttype", FT_UINT16, BASE_DEC,
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VALS(packet_type_vals), 0x0, "Packet type" }},
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/* ARP hardware type? With Linux extensions? */
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{ &hf_sll_hatype,
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{ "Link-layer address type", "sll.hatype", FT_UINT16, BASE_DEC,
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NULL, 0x0, "Link-layer address type" }},
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{ &hf_sll_halen,
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{ "Link-layer address length", "sll.halen", FT_UINT16, BASE_DEC,
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NULL, 0x0, "Link-layer address length" }},
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/* Source address if it's an Ethernet-type address */
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{ &hf_sll_src_eth,
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{ "Source", "sll.src.eth", FT_ETHER, BASE_NONE, NULL, 0x0,
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"Source link-layer address" }},
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/* Source address if it's not an Ethernet-type address */
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{ &hf_sll_src_other,
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{ "Source", "sll.src.other", FT_BYTES, BASE_HEX, NULL, 0x0,
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"Source link-layer address" }},
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/* if the protocol field is an internal Linux protocol type */
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{ &hf_sll_ltype,
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{ "Protocol", "sll.ltype", FT_UINT16, BASE_HEX,
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VALS(ltype_vals), 0x0, "Linux protocol type" }},
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/* registered here but handled in ethertype.c */
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{ &hf_sll_etype,
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{ "Protocol", "sll.etype", FT_UINT16, BASE_HEX,
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VALS(etype_vals), 0x0, "Ethernet protocol type" }},
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{ &hf_sll_trailer,
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{ "Trailer", "sll.trailer", FT_BYTES, BASE_NONE, NULL, 0x0,
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"Trailer" }},
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};
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static gint *ett[] = {
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&ett_sll,
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};
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proto_sll = proto_register_protocol("Linux cooked-mode capture",
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"SLL", "sll" );
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proto_register_field_array(proto_sll, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_sll(void)
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{
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/*
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* Get handles for the IPX and LLC dissectors.
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*/
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llc_handle = find_dissector("llc");
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ipx_handle = find_dissector("ipx");
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dissector_add("wtap_encap", WTAP_ENCAP_SLL, dissect_sll, proto_sll);
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}
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