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wireshark/epan/dissectors/packet-llc.c

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/* packet-llc.c
* Routines for IEEE 802.2 LLC layer
* Gilbert Ramirez <gram@alumni.rice.edu>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/capture_dissectors.h>
#include <wiretap/wtap.h>
#include <wsutil/pint.h>
#include <epan/oui.h>
#include <epan/xdlc.h>
#include <epan/llcsaps.h>
#include <epan/bridged_pids.h>
#include <epan/ppptypes.h>
#include <epan/arcnet_pids.h>
#include <epan/nlpid.h>
#include <epan/addr_resolv.h>
#include "packet-fc.h"
#include "packet-ip.h"
#include "packet-ipx.h"
#include "packet-netbios.h"
#include "packet-sll.h"
#include "packet-juniper.h"
#include "packet-llc.h"
void proto_register_basicxid(void);
void proto_register_llc(void);
void proto_reg_handoff_llc(void);
#define UDP_PORT_LLC_RANGE "12000-12004"
static int proto_llc = -1;
static int hf_llc_dsap = -1;
static int hf_llc_ssap = -1;
static int hf_llc_dsap_sap = -1;
static int hf_llc_dsap_ig = -1;
static int hf_llc_ssap_sap = -1;
static int hf_llc_ssap_cr = -1;
static int hf_llc_ctrl = -1;
static int hf_llc_n_r = -1;
static int hf_llc_n_s = -1;
static int hf_llc_p = -1;
static int hf_llc_p_ext = -1;
static int hf_llc_f = -1;
static int hf_llc_f_ext = -1;
static int hf_llc_s_ftype = -1;
static int hf_llc_u_modifier_cmd = -1;
static int hf_llc_u_modifier_resp = -1;
static int hf_llc_ftype_i = -1;
static int hf_llc_ftype_s_u = -1;
static int hf_llc_ftype_s_u_ext = -1;
static int hf_llc_type = -1;
static int hf_llc_oui = -1;
static int hf_llc_pid = -1;
static int proto_basicxid = -1;
static int hf_llc_xid_format = -1;
static int hf_llc_xid_types = -1;
static int hf_llc_xid_wsize = -1;
static gint ett_llc = -1;
static gint ett_llc_dsap = -1;
static gint ett_llc_ssap = -1;
static gint ett_llc_ctrl = -1;
static gint ett_llc_basicxid = -1;
static dissector_table_t dsap_subdissector_table;
static dissector_table_t xid_subdissector_table;
static dissector_table_t ethertype_subdissector_table;
static dissector_table_t hpteam_subdissector_table;
static dissector_handle_t bpdu_handle;
static dissector_handle_t eth_withoutfcs_handle;
static dissector_handle_t eth_withfcs_handle;
static dissector_handle_t fddi_handle;
static dissector_handle_t tr_handle;
static dissector_handle_t turbo_handle;
static dissector_handle_t mesh_handle;
static dissector_handle_t llc_handle;
/*
* Group/Individual bit, in the DSAP.
*/
#define DSAP_GI_BIT 0x01
/*
* Command/Response bit, in the SSAP.
*
* The low-order bit of the SSAP apparently determines whether this
* is a request or a response. (RFC 1390, "Transmission of IP and
* ARP over FDDI Networks", says
*
* Command frames are identified by having the low order
* bit of the SSAP address reset to zero. Response frames
* have the low order bit of the SSAP address set to one.
*
* and a page I've seen seems to imply that's part of 802.2.)
*/
#define SSAP_CR_BIT 0x01
/*
* Mask to extrace the SAP number from the DSAP or the SSAP.
*/
#define SAP_MASK 0xFE
/*
* These are for SSAP and DSAP, wth last bit always zero.
* XXX - some DSAPs come in separate "individual" and "group" versions,
* with the last bit 0 and 1, respectively (e.g., LLC Sub-layer Management,
* IBM SNA Path Control, IBM Net Management), but, whilst 0xFE is
* the ISO Network Layer Protocol, 0xFF is the Global LSAP.
*/
const value_string sap_vals[] = {
{ SAP_NULL, "NULL LSAP" },
{ SAP_NULL+1, "NULL LSAP" },
{ SAP_LLC_SLMGMT, "LLC Sub-Layer Management" },
{ SAP_SNA_PATHCTRL, "SNA Path Control" },
{ SAP_IP, "TCP/IP" },
{ SAP_SNA1, "SNA" },
{ SAP_SNA2, "SNA" },
{ SAP_PROWAY_NM_INIT, "PROWAY (IEC955) Network Management and Initialization" },
{ SAP_NETWARE1, "NetWare (unofficial?)" },
{ SAP_OSINL1, "ISO Network Layer (OSLAN 1)" },
{ SAP_TI, "Texas Instruments" },
{ SAP_OSINL2, "ISO Network Layer (unofficial?)" },
{ SAP_OSINL3, "ISO Network Layer (unofficial?)" },
{ SAP_BPDU, "Spanning Tree BPDU" },
{ SAP_RS511, "EIA RS-511 Manufacturing Message Service" },
{ SAP_OSINL4, "ISO Network Layer (OSLAN 2)" },
{ SAP_X25, "ISO 8208 (X.25 over 802.2)" },
/*
* XXX - setting the group bit of SAP_X25 make 0x7F; is this just
* a group version of that?
*/
{ 0x7F, "ISO 802.2" },
{ SAP_XNS, "XNS" },
{ SAP_BACNET, "BACnet" },
{ SAP_NESTAR, "Nestar" },
{ SAP_PROWAY_ASLM, "PROWAY (IEC955) Active Station List Maintenance" },
{ SAP_ARP, "ARP" }, /* XXX - hand to "dissect_arp()"? */
{ SAP_HPJD, "HP JetDirect Printer" },
{ SAP_SNAP, "SNAP" },
{ SAP_VINES1, "Banyan Vines" },
{ SAP_VINES2, "Banyan Vines" },
{ SAP_NETWARE2, "NetWare" },
{ SAP_NETBIOS, "NetBIOS" },
{ SAP_IBMNM, "IBM Net Management" },
{ SAP_HPEXT, "HP Extended LLC" },
{ SAP_UB, "Ungermann-Bass" },
{ SAP_RPL, "Remote Program Load" },
{ SAP_OSINL5, "ISO Network Layer" },
{ SAP_GLOBAL, "Global LSAP" },
{ 0x00, NULL }
};
static const value_string format_vals[] = {
{ 0x81, "LLC basic format" },
{ 0, NULL }
};
/*
* Mask to extract the type from XID frame.
*/
#define TYPES_MASK 0x1F
static const value_string type_vals[] = {
{ 1, "Type 1 LLC (Class I LLC)" },
{ 2, "Type 2 LLC" },
{ 3, "Type 1 and Type 2 LLCs (Class II LLC)" },
{ 4, "Type 3 LLC" },
{ 5, "Type 1 and Type 3 LLCs (Class III LLC)" },
{ 6, "Type 2 and Type 3 LLCs" },
{ 7, "Type 1 and Type 2 and Type 3 LLCs (Class IV LLC)" },
{ 0, NULL }
};
/*
* Hash table for translating OUIs to an oui_info_t.
*/
static wmem_map_t *oui_info_table = NULL;
/*
* Decode the SAP value as a bitfield into a string, skipping the GI/CR bit.
* Ordinarily, this could be done easily by specifying a bitmask in the
* corresponding hf_ entry for the DSAP/SSAP value and simply using a
* proto_tree_add_... function to add the item into a proto tree. The
* problem is that the proto_tree_add_... functions always bitshift the
* value if a bitmask is specified. A SAP value always comprises the entire
* octet, however, and must not be shifted. Therefore, using a simple
* proto_tree_add_... function to display the topmost 7 bits of the SAP
* value as a bitfield produces incorrect results (while the bitfield is
* displayed correctly, Wireshark uses the bitshifted value to display the
* associated name and for filtering purposes). This function calls a
* BASE_CUSTOM routine to decode the SAP value as a bitfield
* counter-balancing the bitshift of the original value.
*/
static void
llc_sap_value( gchar *result, guint32 sap )
{
g_snprintf( result, ITEM_LABEL_LENGTH, "%s", val_to_str_const(sap<<1, sap_vals, "Unknown"));
}
/*
* Add an entry for a new OUI.
*/
void
llc_add_oui(guint32 oui, const char *table_name, const char *table_ui_name,
hf_register_info *hf_item, const int proto)
{
oui_info_t *new_info;
new_info = wmem_new(wmem_epan_scope(), oui_info_t);
new_info->table = register_dissector_table(table_name,
table_ui_name, proto, FT_UINT16, BASE_HEX);
new_info->field_info = hf_item;
/*
* Create the hash table for OUI information, if it doesn't
* already exist.
*/
if (oui_info_table == NULL) {
oui_info_table = wmem_map_new(wmem_epan_scope(), g_direct_hash,
g_direct_equal);
}
wmem_map_insert(oui_info_table, GUINT_TO_POINTER(oui), new_info);
}
static gboolean
capture_snap(const guchar *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_)
{
guint32 oui;
guint16 etype;
if (!BYTES_ARE_IN_FRAME(offset, len, 5))
return FALSE;
oui = pd[offset] << 16 | pd[offset+1] << 8 | pd[offset+2];
etype = pntoh16(&pd[offset+3]);
switch (oui) {
case OUI_ENCAP_ETHER:
case OUI_CISCO_90:
return try_capture_dissector("ethertype", etype, pd, offset+5, len, cpinfo, pseudo_header);
case OUI_CISCO:
return try_capture_dissector("ethertype", etype, pd, offset+5, len, cpinfo, pseudo_header);
case OUI_MARVELL:
/*
* OLPC packet. The PID is an Ethertype, but
* there's a mesh header between the PID and
* the payload. (We assume the header is
* 5 bytes, for now).
*/
return try_capture_dissector("ethertype", etype, pd, offset+5+5, len, cpinfo, pseudo_header);
}
return FALSE;
}
static gboolean
capture_llc(const guchar *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_) {
int is_snap;
guint16 control;
int llc_header_len;
if (!BYTES_ARE_IN_FRAME(offset, len, 2))
return FALSE;
is_snap = (pd[offset] == SAP_SNAP) && (pd[offset+1] == SAP_SNAP);
llc_header_len = 2; /* DSAP + SSAP */
/*
* XXX - the page referred to in the comment above about the
* Command/Response bit also implies that LLC Type 2 always
* uses extended operation, so we don't need to determine
* whether it's basic or extended operation; is that the case?
*/
control = get_xdlc_control(pd, offset+2, pd[offset+1] & SSAP_CR_BIT);
llc_header_len += XDLC_CONTROL_LEN(control, TRUE);
if (!BYTES_ARE_IN_FRAME(offset, len, llc_header_len))
return FALSE;
if (!XDLC_IS_INFORMATION(control))
return FALSE;
if (is_snap)
return capture_snap(pd, offset+llc_header_len, len, cpinfo, pseudo_header);
/* non-SNAP */
return try_capture_dissector("llc.dsap", pd[offset], pd, offset + llc_header_len, len, cpinfo, pseudo_header);
}
/* Used only for U frames */
static const xdlc_cf_items llc_cf_items = {
NULL,
NULL,
&hf_llc_p,
&hf_llc_f,
NULL,
&hf_llc_u_modifier_cmd,
&hf_llc_u_modifier_resp,
NULL,
&hf_llc_ftype_s_u
};
/* Used only for I and S frames */
static const xdlc_cf_items llc_cf_items_ext = {
&hf_llc_n_r,
&hf_llc_n_s,
&hf_llc_p_ext,
&hf_llc_f_ext,
&hf_llc_s_ftype,
NULL,
NULL,
&hf_llc_ftype_i,
&hf_llc_ftype_s_u_ext
};
static int
dissect_basicxid(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *xid_tree = NULL;
proto_item *ti = NULL;
guint8 format, types, wsize;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "XID");
col_clear(pinfo->cinfo, COL_INFO);
format = tvb_get_guint8(tvb, 0);
ti = proto_tree_add_item(tree, proto_basicxid, tvb, 0, -1, ENC_NA);
xid_tree = proto_item_add_subtree(ti, ett_llc_basicxid);
proto_tree_add_uint(xid_tree, hf_llc_xid_format, tvb, 0, 1, format);
col_append_str(pinfo->cinfo, COL_INFO, "Basic Format");
types = tvb_get_guint8(tvb, 1);
proto_tree_add_uint(xid_tree, hf_llc_xid_types, tvb, 1,
1, types & TYPES_MASK);
col_append_fstr(pinfo->cinfo, COL_INFO,
"; %s", val_to_str(types & TYPES_MASK, type_vals, "0x%02x")
);
wsize = tvb_get_guint8(tvb, 2);
proto_tree_add_uint(xid_tree, hf_llc_xid_wsize, tvb, 2,
1, (wsize & 0xFE) >> 1);
col_append_fstr(pinfo->cinfo, COL_INFO,
"; Window Size %d", (wsize & 0xFE) >> 1);
return tvb_captured_length(tvb);
}
static int
dissect_llc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *llc_tree;
proto_tree *field_tree;
proto_item *ti, *sap_item;
int is_snap;
guint16 control, etype;
int llc_header_len;
guint8 dsap, ssap, format;
tvbuff_t *next_tvb;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "LLC");
col_clear(pinfo->cinfo, COL_INFO);
dsap = tvb_get_guint8(tvb, 0);
ti = proto_tree_add_item(tree, proto_llc, tvb, 0, -1, ENC_NA);
llc_tree = proto_item_add_subtree(ti, ett_llc);
/* IEEE 1609.3 Ch 5.2.1
* The LLC sublayer header consists solely of a 2-octet field
* that contains an EtherType that identifies the higher layer protocol...
* Check for 0x86DD too?
*/
if (tvb_bytes_exist(tvb, 0, 2) &&
(etype = tvb_get_ntohs(tvb, 0)) == 0x88DC) {
proto_tree_add_item(llc_tree, hf_llc_type, tvb, 0, 2, ENC_BIG_ENDIAN);
next_tvb = tvb_new_subset_remaining(tvb, 2);
if (!dissector_try_uint(ethertype_subdissector_table,
etype, next_tvb, pinfo, tree))
call_data_dissector(next_tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
sap_item = proto_tree_add_item(llc_tree, hf_llc_dsap, tvb, 0, 1, ENC_BIG_ENDIAN);
field_tree = proto_item_add_subtree(sap_item, ett_llc_dsap);
proto_tree_add_item(field_tree, hf_llc_dsap_sap, tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(field_tree, hf_llc_dsap_ig, tvb, 0, 1, ENC_NA);
ssap = tvb_get_guint8(tvb, 1);
sap_item = proto_tree_add_item(llc_tree, hf_llc_ssap, tvb, 1, 1, ENC_BIG_ENDIAN);
field_tree = proto_item_add_subtree(sap_item, ett_llc_ssap);
proto_tree_add_item(field_tree, hf_llc_ssap_sap, tvb, 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(field_tree, hf_llc_ssap_cr, tvb, 1, 1, ENC_NA);
is_snap = (dsap == SAP_SNAP) && (ssap == SAP_SNAP);
llc_header_len = 2; /* DSAP + SSAP */
/*
* XXX - the page referred to in the comment above about the
* Command/Response bit also implies that LLC Type 2 always
* uses extended operation, so we don't need to determine
* whether it's basic or extended operation; is that the case?
*/
control = dissect_xdlc_control(tvb, 2, pinfo, llc_tree,
hf_llc_ctrl, ett_llc_ctrl,
&llc_cf_items, &llc_cf_items_ext,
NULL, NULL, ssap & SSAP_CR_BIT, TRUE, FALSE);
llc_header_len += XDLC_CONTROL_LEN(control, TRUE);
if (is_snap)
llc_header_len += 5; /* 3 bytes of OUI, 2 bytes of protocol ID */
if (tree)
proto_item_set_len(ti, llc_header_len);
if (is_snap) {
dissect_snap(tvb, 2+XDLC_CONTROL_LEN(control, TRUE), pinfo, tree, llc_tree, control,
hf_llc_oui, hf_llc_type, hf_llc_pid, 2);
}
else {
col_append_fstr(pinfo->cinfo, COL_INFO,
"; DSAP %s %s, SSAP %s %s",
val_to_str(dsap & SAP_MASK, sap_vals, "0x%02x"),
dsap & DSAP_GI_BIT ?
"Group" : "Individual",
val_to_str(ssap & SAP_MASK, sap_vals, "0x%02x"),
ssap & SSAP_CR_BIT ?
"Response" : "Command"
);
if (tvb_reported_length_remaining(tvb, llc_header_len) > 0) {
next_tvb = tvb_new_subset_remaining(tvb, llc_header_len);
if (XDLC_IS_INFORMATION(control)) {
/*
* Non-SNAP I or UI frame.
* Try the regular LLC subdissector table
* with the DSAP.
*/
if (!dissector_try_uint(dsap_subdissector_table,
dsap, next_tvb, pinfo, tree)) {
call_data_dissector(next_tvb, pinfo, tree);
}
} else if ((control & (XDLC_U_MODIFIER_MASK|XDLC_U))
== (XDLC_XID|XDLC_U)) {
/*
* Non-SNAP XID frame.
* Test for LLC basic format first
*/
format = tvb_get_guint8(next_tvb, 0);
if (format == 0x81) {
dissect_basicxid(next_tvb, pinfo, tree, data);
} else {
/*
* Try the XID LLC subdissector table
* with the DSAP.
*/
if (!dissector_try_uint(
xid_subdissector_table, dsap,
next_tvb, pinfo, tree)) {
call_data_dissector(next_tvb, pinfo, tree);
}
}
} else {
call_data_dissector(next_tvb, pinfo, tree);
}
}
}
return tvb_captured_length(tvb);
}
/*
* Dissect SNAP header; used elsewhere, e.g. in the Frame Relay dissector.
*/
void
dissect_snap(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree,
proto_tree *snap_tree, int control, int hf_oui, int hf_type, int hf_pid,
int bridge_pad)
{
guint32 oui;
const gchar *oui_str;
guint16 etype;
tvbuff_t *next_tvb;
oui_info_t *oui_info;
dissector_table_t subdissector_table;
int hf;
int mesh_header_len;
/*
* XXX - what about non-UI frames?
*/
etype = tvb_get_ntohs(tvb, offset+3);
proto_tree_add_item_ret_uint(snap_tree, hf_oui, tvb, offset, 3, ENC_BIG_ENDIAN, &oui);
oui_str = uint_get_manuf_name_if_known(oui);
col_append_fstr(pinfo->cinfo, COL_INFO,
"; SNAP, OUI 0x%06X (%s), PID 0x%04X",
oui, oui_str ? oui_str : "Unknown", etype);
switch (oui) {
case OUI_HP_2:
/*
* We don't use the standard SNAP OUI mechanism here
* because that only calls the subdissector for
* information frames, and, according to the HP document
* at
*
* http://www.hp.com/sbso/bus_protect/teaming.pdf
*
* the heartbeats are sent to 03-00-C7-00-00-EE in SNAP
* frames in unnumbered TEST frames, not information
* frames (numbered or unnumbered).
*
* See the comment in epan/dissectors/packet-hpteam.c
* for more details.
*/
oui_info = get_snap_oui_info(oui);
hf = *oui_info->field_info->p_id;
proto_tree_add_uint(snap_tree, hf, tvb, offset+3, 2, etype);
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
if(!dissector_try_uint(hpteam_subdissector_table,etype, next_tvb, pinfo, tree))
call_data_dissector(next_tvb, pinfo, tree);
break;
case OUI_ENCAP_ETHER:
case OUI_CISCO_90:
if (XDLC_IS_INFORMATION(control)) {
if (tree) {
proto_tree_add_uint(snap_tree, hf_type,
tvb, offset+3, 2, etype);
}
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
if (!dissector_try_uint(ethertype_subdissector_table,
etype, next_tvb, pinfo, tree))
call_data_dissector(next_tvb, pinfo, tree);
} else {
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
call_data_dissector(next_tvb, pinfo, tree);
}
break;
case OUI_IEEE_802_1:
/*
* MAC frames bridged over ATM (RFC 2684) or Frame Relay
* (RFC 2427).
*
* We have to figure out how much padding to put
* into the frame. We were handed a "bridge_pad"
* argument which should be 0 for Frame Relay and
* 2 for ATM; we add to that the amount of padding
* common to both bridging types.
*/
if (tree) {
proto_tree_add_uint(snap_tree, hf_pid, tvb, offset+3, 2,
etype);
}
switch (etype) {
case BPID_ETH_WITH_FCS:
next_tvb = tvb_new_subset_remaining(tvb, offset+5+bridge_pad);
call_dissector(eth_withfcs_handle, next_tvb, pinfo,
tree);
break;
case BPID_ETH_WITHOUT_FCS:
next_tvb = tvb_new_subset_remaining(tvb, offset+5+bridge_pad);
call_dissector(eth_withoutfcs_handle, next_tvb, pinfo, tree);
break;
case BPID_802_5_WITH_FCS:
case BPID_802_5_WITHOUT_FCS:
/*
* We treat the last padding byte as the Access
* Control byte, as that's what the Token
* Ring dissector expects the first byte to
* be.
*/
next_tvb = tvb_new_subset_remaining(tvb, offset+5+bridge_pad);
call_dissector(tr_handle, next_tvb, pinfo, tree);
break;
case BPID_FDDI_WITH_FCS:
case BPID_FDDI_WITHOUT_FCS:
next_tvb = tvb_new_subset_remaining(tvb, offset+5+1+bridge_pad);
call_dissector(fddi_handle, next_tvb, pinfo, tree);
break;
case BPID_BPDU:
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
call_dissector(bpdu_handle, next_tvb, pinfo, tree);
break;
default:
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
call_data_dissector(next_tvb, pinfo, tree);
break;
}
break;
case OUI_CABLE_BPDU: /* DOCSIS cable modem spanning tree BPDU */
if (tree) {
proto_tree_add_uint(snap_tree, hf_pid, tvb, offset+3, 2,
etype);
}
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
call_dissector(bpdu_handle, next_tvb, pinfo, tree);
break;
case OUI_TURBOCELL:
next_tvb = tvb_new_subset_remaining(tvb, offset+3);
call_dissector(turbo_handle, next_tvb, pinfo, tree);
break;
case OUI_MARVELL:
/*
* OLPC packet. The PID is an Ethertype, but
* there's a mesh header between the PID and
* the payload.
*/
if (XDLC_IS_INFORMATION(control)) {
if (tree) {
proto_tree_add_uint(snap_tree, hf_type,
tvb, offset+3, 2, etype);
}
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
mesh_header_len = call_dissector(mesh_handle,
next_tvb, pinfo, tree);
next_tvb = tvb_new_subset_remaining(tvb, offset+5+mesh_header_len);
if (!dissector_try_uint(ethertype_subdissector_table,
etype, next_tvb, pinfo, tree))
call_data_dissector(next_tvb, pinfo, tree);
} else {
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
call_data_dissector(next_tvb, pinfo, tree);
}
break;
default:
/*
* Do we have information for this OUI?
*/
oui_info = get_snap_oui_info(oui);
if (oui_info != NULL) {
/*
* Yes - use it.
*/
hf = *oui_info->field_info->p_id;
subdissector_table = oui_info->table;
} else {
/*
* No, use hf_pid for the PID and just dissect
* the payload as data.
*/
hf = hf_pid;
subdissector_table = NULL;
}
if (tree) {
proto_tree_add_uint(snap_tree, hf, tvb, offset+3, 2,
etype);
}
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
if (XDLC_IS_INFORMATION(control)) {
if (subdissector_table != NULL) {
/* do lookup with the subdissector table */
if (dissector_try_uint(subdissector_table,
etype, next_tvb, pinfo, tree))
break;
}
}
call_data_dissector(next_tvb, pinfo, tree);
break;
}
}
/*
* Return the oui_info_t for the PID for a particular OUI value, or NULL
* if there isn't one.
*/
oui_info_t *
get_snap_oui_info(guint32 oui)
{
if (oui_info_table != NULL) {
return (oui_info_t *)wmem_map_lookup(oui_info_table,
GUINT_TO_POINTER(oui));
} else
return NULL;
}
void
proto_register_llc(void)
{
static struct true_false_string ig_bit = { "Group", "Individual" };
static struct true_false_string cr_bit = { "Response", "Command" };
static hf_register_info hf[] = {
{ &hf_llc_dsap,
{ "DSAP", "llc.dsap", FT_UINT8, BASE_HEX,
VALS(sap_vals), 0x0, "Destination Service Access Point", HFILL }},
{ &hf_llc_dsap_sap,
{ "SAP", "llc.dsap.sap", FT_UINT8, BASE_CUSTOM,
CF_FUNC(llc_sap_value), 0xFE, "Service Access Point", HFILL }},
{ &hf_llc_dsap_ig,
{ "IG Bit", "llc.dsap.ig", FT_BOOLEAN, 8,
TFS(&ig_bit), DSAP_GI_BIT, "Individual/Group", HFILL }},
{ &hf_llc_ssap,
{ "SSAP", "llc.ssap", FT_UINT8, BASE_HEX,
VALS(sap_vals), 0x0, "Source Service Access Point", HFILL }},
{ &hf_llc_ssap_sap,
{ "SAP", "llc.ssap.sap", FT_UINT8, BASE_CUSTOM,
CF_FUNC(llc_sap_value), 0xFE, "Service Access Point", HFILL }},
{ &hf_llc_ssap_cr,
{ "CR Bit", "llc.ssap.cr", FT_BOOLEAN, 8,
TFS(&cr_bit), SSAP_CR_BIT, "Command/Response", HFILL }},
{ &hf_llc_ctrl,
{ "Control", "llc.control", FT_UINT16, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
{ &hf_llc_n_r,
{ "N(R)", "llc.control.n_r", FT_UINT16, BASE_DEC,
NULL, XDLC_N_R_EXT_MASK, NULL, HFILL }},
{ &hf_llc_n_s,
{ "N(S)", "llc.control.n_s", FT_UINT16, BASE_DEC,
NULL, XDLC_N_S_EXT_MASK, NULL, HFILL }},
{ &hf_llc_p,
{ "Poll", "llc.control.p", FT_BOOLEAN, 8,
TFS(&tfs_set_notset), XDLC_P_F, NULL, HFILL }},
{ &hf_llc_p_ext,
{ "Poll", "llc.control.p", FT_BOOLEAN, 16,
TFS(&tfs_set_notset), XDLC_P_F_EXT, NULL, HFILL }},
{ &hf_llc_f,
{ "Final", "llc.control.f", FT_BOOLEAN, 8,
TFS(&tfs_set_notset), XDLC_P_F, NULL, HFILL }},
{ &hf_llc_f_ext,
{ "Final", "llc.control.f", FT_BOOLEAN, 16,
TFS(&tfs_set_notset), XDLC_P_F_EXT, NULL, HFILL }},
{ &hf_llc_s_ftype,
{ "Supervisory frame type", "llc.control.s_ftype", FT_UINT16, BASE_HEX,
VALS(stype_vals), XDLC_S_FTYPE_MASK, NULL, HFILL }},
{ &hf_llc_u_modifier_cmd,
{ "Command", "llc.control.u_modifier_cmd", FT_UINT8, BASE_HEX,
VALS(modifier_vals_cmd), XDLC_U_MODIFIER_MASK, NULL, HFILL }},
{ &hf_llc_u_modifier_resp,
{ "Response", "llc.control.u_modifier_resp", FT_UINT8, BASE_HEX,
VALS(modifier_vals_resp), XDLC_U_MODIFIER_MASK, NULL, HFILL }},
{ &hf_llc_ftype_i,
{ "Frame type", "llc.control.ftype", FT_UINT16, BASE_HEX,
VALS(ftype_vals), XDLC_I_MASK, NULL, HFILL }},
{ &hf_llc_ftype_s_u,
{ "Frame type", "llc.control.ftype", FT_UINT8, BASE_HEX,
VALS(ftype_vals), XDLC_S_U_MASK, NULL, HFILL }},
{ &hf_llc_ftype_s_u_ext,
{ "Frame type", "llc.control.ftype", FT_UINT16, BASE_HEX,
VALS(ftype_vals), XDLC_S_U_MASK, NULL, HFILL }},
/* registered here but handled in ethertype.c */
{ &hf_llc_type,
{ "Type", "llc.type", FT_UINT16, BASE_HEX,
VALS(etype_vals), 0x0, NULL, HFILL }},
{ &hf_llc_oui,
{ "Organization Code", "llc.oui", FT_UINT24, BASE_OUI,
NULL, 0x0, NULL, HFILL }},
{ &hf_llc_pid,
{ "Protocol ID", "llc.pid", FT_UINT16, BASE_HEX,
NULL, 0x0, NULL, HFILL }}
};
static gint *ett[] = {
&ett_llc,
&ett_llc_dsap,
&ett_llc_ssap,
&ett_llc_ctrl,
};
proto_llc = proto_register_protocol("Logical-Link Control", "LLC", "llc");
proto_register_field_array(proto_llc, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* subdissector code */
dsap_subdissector_table = register_dissector_table("llc.dsap",
"LLC SAP", proto_llc, FT_UINT8, BASE_HEX);
xid_subdissector_table = register_dissector_table("llc.xid_dsap",
"LLC XID SAP", proto_llc, FT_UINT8, BASE_HEX);
register_capture_dissector_table("llc.dsap", "LLC");
llc_handle = register_dissector("llc", dissect_llc, proto_llc);
register_capture_dissector("llc", capture_llc, proto_llc);
}
void
proto_register_basicxid(void)
{
static hf_register_info hf[] = {
{ &hf_llc_xid_format,
{ "XID Format", "basicxid.llc.xid.format", FT_UINT8, BASE_HEX,
VALS(format_vals), 0x0, NULL, HFILL }},
{ &hf_llc_xid_types,
{ "LLC Types/Classes", "basicxid.llc.xid.types", FT_UINT8, BASE_HEX,
VALS(type_vals), 0x0, NULL, HFILL }},
{ &hf_llc_xid_wsize,
{ "Receive Window Size", "basicxid.llc.xid.wsize", FT_UINT8, BASE_DEC,
NULL, 0x0, NULL, HFILL }}
};
static gint *ett[] = {
&ett_llc_basicxid
};
proto_basicxid = proto_register_protocol("Logical-Link Control Basic Format XID", "Basic Format XID", "basicxid");
proto_register_field_array(proto_basicxid, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("basicxid", dissect_basicxid, proto_basicxid);
}
static void
register_hf(gpointer key _U_, gpointer value, gpointer user_data _U_)
{
oui_info_t *info = (oui_info_t *)value;
proto_register_field_array(proto_llc, info->field_info, 1);
}
void
proto_reg_handoff_llc(void)
{
capture_dissector_handle_t llc_cap_handle;
capture_dissector_handle_t llc_snap_handle;
/*
* Get handles for the BPDU, Ethernet, FDDI, Token Ring and
* Turbocell dissectors.
*/
bpdu_handle = find_dissector_add_dependency("bpdu", proto_llc);
eth_withoutfcs_handle = find_dissector_add_dependency("eth_withoutfcs", proto_llc);
eth_withfcs_handle = find_dissector_add_dependency("eth_withfcs", proto_llc);
fddi_handle = find_dissector_add_dependency("fddi", proto_llc);
tr_handle = find_dissector_add_dependency("tr", proto_llc);
turbo_handle = find_dissector_add_dependency("turbocell", proto_llc);
mesh_handle = find_dissector_add_dependency("mesh", proto_llc);
/*
* Get the Ethertype dissector table.
*/
ethertype_subdissector_table = find_dissector_table("ethertype");
hpteam_subdissector_table = find_dissector_table("llc.hpteam_pid");
dissector_add_uint("wtap_encap", WTAP_ENCAP_ATM_RFC1483, llc_handle);
dissector_add_uint("sll.ltype", LINUX_SLL_P_802_2, llc_handle);
/* RFC 2043 */
dissector_add_uint("ppp.protocol", PPP_LLC, llc_handle);
/* RFC 2353 */
dissector_add_uint_range_with_preference("udp.port", UDP_PORT_LLC_RANGE, llc_handle);
/* IP-over-FC when we have the full FC frame */
dissector_add_uint("fc.ftype", FC_FTYPE_IP, llc_handle);
dissector_add_uint("atm.aal5.type", TRAF_LLCMX, llc_handle);
/*
* BACNET-over-ARCNET is really BACNET-over-802.2 LLC-over-ARCNET,
* apparently.
*/
dissector_add_uint("arcnet.protocol_id", ARCNET_PROTO_BACNET, llc_handle);
dissector_add_uint("ethertype", ETHERTYPE_JUMBO_LLC, llc_handle);
dissector_add_uint("juniper.proto", JUNIPER_PROTO_LLC, llc_handle);
dissector_add_uint("juniper.proto", JUNIPER_PROTO_LLC_SNAP, llc_handle);
llc_cap_handle = find_capture_dissector("llc");
capture_dissector_add_uint("ethertype", ETHERTYPE_JUMBO_LLC, llc_cap_handle);
capture_dissector_add_uint("atm.aal5.type", TRAF_LLCMX, llc_cap_handle);
capture_dissector_add_uint("sll.ltype", LINUX_SLL_P_802_2, llc_cap_handle);
llc_snap_handle = register_capture_dissector("llc_snap", capture_snap, proto_llc);
capture_dissector_add_uint("fr.nlpid", NLPID_SNAP, llc_snap_handle);
/*
* Register all the fields for PIDs for various OUIs.
*/
if (oui_info_table != NULL)
wmem_map_foreach(oui_info_table, register_hf, NULL);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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