263 lines
7.2 KiB
C
263 lines
7.2 KiB
C
/* packet-netlink.c
|
|
*
|
|
* $Id$
|
|
*
|
|
* Wireshark - Network traffic analyzer
|
|
* By Gerald Combs <gerald@wireshark.org>
|
|
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
/* http://www.tcpdump.org/linktypes/LINKTYPE_NETLINK.html */
|
|
|
|
#define NEW_PROTO_TREE_API
|
|
|
|
#include "config.h"
|
|
|
|
#include <glib.h>
|
|
|
|
#include <epan/arptypes.h>
|
|
#include <epan/packet.h>
|
|
#include <wiretap/wtap.h>
|
|
|
|
#include "packet-netlink.h"
|
|
|
|
/*
|
|
* A DLT_LINUX_SLL fake link-layer header.
|
|
*/
|
|
#define SLL_HEADER_SIZE 16 /* total header length */
|
|
|
|
static const value_string family_vals[] = {
|
|
{ WS_NETLINK_ROUTE, "Route" },
|
|
{ WS_NETLINK_UNUSED, "Unused" },
|
|
{ WS_NETLINK_USERSOCK, "user-mode" },
|
|
{ WS_NETLINK_FIREWALL, "Unused (formerly: ip_queue)" },
|
|
{ WS_NETLINK_SOCK_DIAG, "socket monitoring" },
|
|
{ WS_NETLINK_NFLOG, "Netfilter ULOG" },
|
|
{ WS_NETLINK_XFRM, "IPsec" },
|
|
{ WS_NETLINK_SELINUX, "SELinux events" },
|
|
{ WS_NETLINK_ISCSI, "Open-iSCSI" },
|
|
{ WS_NETLINK_AUDIT, "Auditing" },
|
|
{ WS_NETLINK_FIB_LOOKUP, "FIB lookup" },
|
|
{ WS_NETLINK_CONNECTOR, "Kernel connector" },
|
|
{ WS_NETLINK_NETFILTER, "Netfilter" },
|
|
{ WS_NETLINK_IP6_FW, "Unused (formerly: ip6_queue)" },
|
|
{ WS_NETLINK_DNRTMSG, "DECnet routing messages" },
|
|
{ WS_NETLINK_KOBJECT_UEVENT, "Kernel messages" },
|
|
{ WS_NETLINK_GENERIC, "Generic" },
|
|
{ WS_NETLINK_SCSITRANSPORT, "SCSI Transports" },
|
|
{ WS_NETLINK_ECRYPTFS, "ecryptfs" },
|
|
{ WS_NETLINK_RDMA, "RDMA" },
|
|
{ WS_NETLINK_CRYPTO, "Crypto layer" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string type_vals[] = {
|
|
{ WS_NLMSG_NOOP, "nothing" },
|
|
{ WS_NLMSG_ERROR, "error" },
|
|
{ WS_NLMSG_DONE, "end of a dump" },
|
|
{ WS_NLMSG_OVERRUN, "data lost" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static dissector_handle_t netlink_handle;
|
|
|
|
static header_field_info *hfi_netlink = NULL;
|
|
|
|
#define NETLINK_HFI_INIT HFI_INIT(proto_netlink)
|
|
|
|
static header_field_info hfi_netlink_hatype NETLINK_HFI_INIT =
|
|
{ "Link-layer address type", "netlink.hatype", FT_UINT16, BASE_DEC,
|
|
NULL, 0x0, NULL, HFILL };
|
|
|
|
/* Linux netlink protocol type */
|
|
static header_field_info hfi_netlink_family NETLINK_HFI_INIT =
|
|
{ "Family", "netlink.family", FT_UINT16, BASE_HEX,
|
|
VALS(family_vals), 0x00, NULL, HFILL };
|
|
|
|
|
|
static header_field_info hfi_netlink_hdr_len NETLINK_HFI_INIT =
|
|
{ "Length", "netlink.hdr_len", FT_UINT32, BASE_DEC,
|
|
NULL, 0x00, NULL, HFILL };
|
|
|
|
static header_field_info hfi_netlink_hdr_type NETLINK_HFI_INIT =
|
|
{ "Type", "netlink.hdr_type", FT_UINT16, BASE_HEX,
|
|
VALS(type_vals), 0x00, NULL, HFILL };
|
|
|
|
static header_field_info hfi_netlink_hdr_flags NETLINK_HFI_INIT =
|
|
{ "Flags", "netlink.hdr_flags", FT_UINT16, BASE_HEX,
|
|
NULL, 0x00, NULL, HFILL };
|
|
|
|
static header_field_info hfi_netlink_hdr_seq NETLINK_HFI_INIT =
|
|
{ "Sequence", "netlink.hdr_seq", FT_UINT32, BASE_HEX,
|
|
NULL, 0x00, NULL, HFILL };
|
|
|
|
static header_field_info hfi_netlink_hdr_pid NETLINK_HFI_INIT =
|
|
{ "Port ID", "netlink.hdr_pid", FT_UINT32, BASE_HEX,
|
|
NULL, 0x00, NULL, HFILL };
|
|
|
|
static gint ett_netlink_cooked = -1;
|
|
static gint ett_netlink_msghdr = -1;
|
|
static gint ett_netlink_msg = -1;
|
|
|
|
static dissector_table_t netlink_dissector_table;
|
|
static dissector_handle_t data_handle;
|
|
|
|
static int
|
|
dissect_netlink(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *_data _U_)
|
|
{
|
|
guint16 protocol, hatype;
|
|
proto_item *ti;
|
|
tvbuff_t *next_tvb;
|
|
proto_tree *fh_tree = NULL;
|
|
|
|
int offset;
|
|
|
|
hatype = tvb_get_ntohs(tvb, 2);
|
|
if (hatype != ARPHRD_NETLINK)
|
|
return 0;
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Netlink");
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_protocol_format(tree, hfi_netlink->id, tvb, 0,
|
|
SLL_HEADER_SIZE, "Linux netlink (cooked header)");
|
|
fh_tree = proto_item_add_subtree(ti, ett_netlink_cooked);
|
|
}
|
|
|
|
/* Unused 2B */
|
|
offset = 2;
|
|
|
|
proto_tree_add_item(fh_tree, &hfi_netlink_hatype, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
/* Unused 10B */
|
|
offset += 10;
|
|
|
|
protocol = tvb_get_ntohs(tvb, offset);
|
|
proto_tree_add_item(fh_tree, &hfi_netlink_family, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
/* DISSECTOR_ASSERT(offset == 16); */
|
|
|
|
while (tvb_reported_length_remaining(tvb, offset) >= 16) {
|
|
struct packet_netlink_data data;
|
|
|
|
int pkt_end_offset;
|
|
guint32 pkt_len;
|
|
|
|
proto_tree *fh_msg;
|
|
proto_tree *fh_hdr;
|
|
|
|
int encoding = ENC_LITTLE_ENDIAN; /* XXX */
|
|
|
|
pkt_len = tvb_get_letohl(tvb, offset);
|
|
|
|
pkt_end_offset = offset + pkt_len;
|
|
|
|
ti = proto_tree_add_text(tree, tvb, offset, pkt_len, "Netlink message");
|
|
fh_msg = proto_item_add_subtree(ti, ett_netlink_msg);
|
|
|
|
ti = proto_tree_add_text(fh_msg, tvb, offset, 16, "Header");
|
|
fh_hdr = proto_item_add_subtree(ti, ett_netlink_msghdr);
|
|
|
|
proto_tree_add_item(fh_hdr, &hfi_netlink_hdr_len, tvb, offset, 4, encoding);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item(fh_hdr, &hfi_netlink_hdr_type, tvb, offset, 2, encoding);
|
|
data.type = tvb_get_letohs(tvb, offset);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(fh_hdr, &hfi_netlink_hdr_flags, tvb, offset, 2, encoding);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(fh_hdr, &hfi_netlink_hdr_seq, tvb, offset, 4, encoding);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item(fh_hdr, &hfi_netlink_hdr_pid, tvb, offset, 4, encoding);
|
|
offset += 4;
|
|
|
|
if (pkt_len > 16) {
|
|
data.magic = PACKET_NETLINK_MAGIC;
|
|
data.encoding = encoding;
|
|
|
|
next_tvb = tvb_new_subset_length(tvb, offset, pkt_len-16);
|
|
|
|
if (!dissector_try_uint_new(netlink_dissector_table, protocol, next_tvb, pinfo, fh_msg, TRUE, &data))
|
|
call_dissector(data_handle, next_tvb, pinfo, fh_msg);
|
|
|
|
} else if (pkt_len != 16) {
|
|
/* XXX, expert info */
|
|
break;
|
|
}
|
|
|
|
offset = pkt_end_offset;
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
void
|
|
proto_register_netlink(void)
|
|
{
|
|
#ifndef HAVE_HFI_SECTION_INIT
|
|
static header_field_info *hfi[] = {
|
|
/* Cooked header */
|
|
&hfi_netlink_hatype,
|
|
&hfi_netlink_family,
|
|
|
|
/* Netlink message header */
|
|
&hfi_netlink_hdr_len,
|
|
&hfi_netlink_hdr_type,
|
|
&hfi_netlink_hdr_flags,
|
|
&hfi_netlink_hdr_seq,
|
|
&hfi_netlink_hdr_pid,
|
|
};
|
|
#endif
|
|
|
|
static gint *ett[] = {
|
|
&ett_netlink_cooked,
|
|
&ett_netlink_msghdr,
|
|
&ett_netlink_msg
|
|
};
|
|
|
|
int proto_netlink;
|
|
|
|
proto_netlink = proto_register_protocol("Linux netlink protocol", "NETLINK", "netlink" );
|
|
hfi_netlink = proto_registrar_get_nth(proto_netlink);
|
|
|
|
proto_register_fields(proto_netlink, hfi, array_length(hfi));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
netlink_handle = new_create_dissector_handle(dissect_netlink, proto_netlink);
|
|
|
|
netlink_dissector_table = register_dissector_table(
|
|
"netlink.protocol",
|
|
"Linux netlink protocol type",
|
|
FT_UINT16,
|
|
BASE_HEX
|
|
);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_netlink(void)
|
|
{
|
|
data_handle = find_dissector("data");
|
|
|
|
dissector_add_uint("wtap_encap", WTAP_ENCAP_NETLINK, netlink_handle);
|
|
}
|