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wireshark/epan/dissectors/packet-socketcan.c

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/* packet-socketcan.c
* Routines for disassembly of packets from SocketCAN
* Felix Obenhuber <felix@obenhuber.de>
*
* Added support for the DeviceNet Dissector
* Hans-Joergen Gunnarsson <hag@hms.se>
* Copyright 2013
*
* 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/prefs.h>
#include <epan/expert.h>
#include <epan/decode_as.h>
#include <epan/uat.h>
#include <wiretap/wtap.h>
#include "packet-sll.h"
#include "packet-socketcan.h"
void proto_register_socketcan(void);
void proto_reg_handoff_socketcan(void);
static int hf_can_len = -1;
static int hf_can_infoent_ext = -1;
static int hf_can_infoent_std = -1;
static int hf_can_extflag = -1;
static int hf_can_rtrflag = -1;
static int hf_can_errflag = -1;
static int hf_can_reserved = -1;
static int hf_can_padding = -1;
static int hf_can_err_tx_timeout = -1;
static int hf_can_err_lostarb = -1;
static int hf_can_err_ctrl = -1;
static int hf_can_err_prot = -1;
static int hf_can_err_trx = -1;
static int hf_can_err_ack = -1;
static int hf_can_err_busoff = -1;
static int hf_can_err_buserror = -1;
static int hf_can_err_restarted = -1;
static int hf_can_err_reserved = -1;
static int hf_can_err_lostarb_bit_number = -1;
static int hf_can_err_ctrl_rx_overflow = -1;
static int hf_can_err_ctrl_tx_overflow = -1;
static int hf_can_err_ctrl_rx_warning = -1;
static int hf_can_err_ctrl_tx_warning = -1;
static int hf_can_err_ctrl_rx_passive = -1;
static int hf_can_err_ctrl_tx_passive = -1;
static int hf_can_err_ctrl_active = -1;
static int hf_can_err_prot_error_type_bit = -1;
static int hf_can_err_prot_error_type_form = -1;
static int hf_can_err_prot_error_type_stuff = -1;
static int hf_can_err_prot_error_type_bit0 = -1;
static int hf_can_err_prot_error_type_bit1 = -1;
static int hf_can_err_prot_error_type_overload = -1;
static int hf_can_err_prot_error_type_active = -1;
static int hf_can_err_prot_error_type_tx = -1;
static int hf_can_err_prot_error_location = -1;
static int hf_can_err_trx_canh = -1;
static int hf_can_err_trx_canl = -1;
static int hf_can_err_ctrl_specific = -1;
static expert_field ei_can_err_dlc_mismatch = EI_INIT;
static int hf_canfd_brsflag = -1;
static int hf_canfd_esiflag = -1;
static gint ett_can = -1;
static gint ett_can_fd = -1;
static int proto_can = -1;
static int proto_canfd = -1;
static gboolean byte_swap = FALSE;
static gboolean heuristic_first = FALSE;
static heur_dissector_list_t heur_subdissector_list;
static heur_dtbl_entry_t *heur_dtbl_entry;
#define LINUX_CAN_STD 0
#define LINUX_CAN_EXT 1
#define LINUX_CAN_ERR 2
#define CAN_LEN_OFFSET 4
#define CAN_DATA_OFFSET 8
#define CANFD_FLAG_OFFSET 5
#define CANFD_BRS 0x01 /* bit rate switch (second bitrate for payload data) */
#define CANFD_ESI 0x02 /* error state indicator of the transmitting node */
static dissector_table_t can_id_dissector_table = NULL;
static dissector_table_t can_extended_id_dissector_table = NULL;
static dissector_table_t subdissector_table = NULL;
static dissector_handle_t socketcan_classic_handle;
static dissector_handle_t socketcan_fd_handle;
static const value_string can_err_prot_error_location_vals[] =
{
{ 0x00, "unspecified" },
{ 0x02, "ID bits 28 - 21 (SFF: 10 - 3)" },
{ 0x03, "start of frame" },
{ 0x04, "substitute RTR (SFF: RTR)" },
{ 0x05, "identifier extension" },
{ 0x06, "ID bits 20 - 18 (SFF: 2 - 0)" },
{ 0x07, "ID bits 17-13" },
{ 0x08, "CRC sequence" },
{ 0x09, "reserved bit 0" },
{ 0x0A, "data section" },
{ 0x0B, "data length code" },
{ 0x0C, "RTR" },
{ 0x0D, "reserved bit 1" },
{ 0x0E, "ID bits 4-0" },
{ 0x0F, "ID bits 12-5" },
{ 0x12, "intermission" },
{ 0x18, "CRC delimiter" },
{ 0x19, "ACK slot" },
{ 0x1A, "end of frame" },
{ 0x1B, "ACK delimiter" },
{ 0, NULL }
};
static const value_string can_err_trx_canh_vals[] =
{
{ 0x00, "unspecified" },
{ 0x04, "no wire" },
{ 0x05, "short to BAT" },
{ 0x06, "short to VCC" },
{ 0x07, "short to GND" },
{ 0, NULL }
};
static const value_string can_err_trx_canl_vals[] =
{
{ 0x00, "unspecified" },
{ 0x04, "no wire" },
{ 0x05, "short to BAT" },
{ 0x06, "short to VCC" },
{ 0x07, "short to GND" },
{ 0x08, "short to CANH" },
{ 0, NULL }
};
/********* UATs *********/
/* Interface Config UAT */
typedef struct _interface_config {
guint interface_id;
gchar *interface_name;
guint bus_id;
} interface_config_t;
#define DATAFILE_CAN_INTERFACE_MAPPING "CAN_interface_mapping"
static GHashTable *data_can_interfaces_by_id = NULL;
static GHashTable *data_can_interfaces_by_name = NULL;
static interface_config_t* interface_configs = NULL;
static guint interface_config_num = 0;
UAT_HEX_CB_DEF(interface_configs, interface_id, interface_config_t)
UAT_CSTRING_CB_DEF(interface_configs, interface_name, interface_config_t)
UAT_HEX_CB_DEF(interface_configs, bus_id, interface_config_t)
static void *
copy_interface_config_cb(void *n, const void *o, size_t size _U_) {
interface_config_t *new_rec = (interface_config_t *)n;
const interface_config_t *old_rec = (const interface_config_t *)o;
new_rec->interface_id = old_rec->interface_id;
new_rec->interface_name = g_strdup(old_rec->interface_name);
new_rec->bus_id = old_rec->bus_id;
return new_rec;
}
static gboolean
update_interface_config(void *r, char **err) {
interface_config_t *rec = (interface_config_t *)r;
if (rec->interface_id > 0xffffffff) {
*err = ws_strdup_printf("We currently only support 32 bit identifiers (ID: %i Name: %s)",
rec->interface_id, rec->interface_name);
return FALSE;
}
if (rec->bus_id > 0xffff) {
*err = ws_strdup_printf("We currently only support 16 bit bus identifiers (ID: %i Name: %s Bus-ID: %i)",
rec->interface_id, rec->interface_name, rec->bus_id);
return FALSE;
}
return TRUE;
}
static void
free_interface_config_cb(void *r) {
interface_config_t *rec = (interface_config_t *)r;
/* freeing result of g_strdup */
g_free(rec->interface_name);
rec->interface_name = NULL;
}
static interface_config_t *
ht_lookup_interface_config_by_id(unsigned int identifier) {
interface_config_t *tmp = NULL;
unsigned int *id = NULL;
if (interface_configs == NULL) {
return NULL;
}
id = wmem_new(wmem_epan_scope(), unsigned int);
*id = (unsigned int)identifier;
tmp = (interface_config_t *)g_hash_table_lookup(data_can_interfaces_by_id, id);
wmem_free(wmem_epan_scope(), id);
return tmp;
}
static interface_config_t *
ht_lookup_interface_config_by_name(const gchar *name) {
interface_config_t *tmp = NULL;
gchar *key = NULL;
if (interface_configs == NULL) {
return NULL;
}
key = wmem_strdup(wmem_epan_scope(), name);
tmp = (interface_config_t *)g_hash_table_lookup(data_can_interfaces_by_name, key);
wmem_free(wmem_epan_scope(), key);
return tmp;
}
static void
can_free_key(gpointer key) {
wmem_free(wmem_epan_scope(), key);
}
static void
post_update_can_interfaces_cb(void) {
guint i;
int *key_id = NULL;
gchar *key_name = NULL;
/* destroy old hash tables, if they exist */
if (data_can_interfaces_by_id) {
g_hash_table_destroy(data_can_interfaces_by_id);
data_can_interfaces_by_id = NULL;
}
if (data_can_interfaces_by_name) {
g_hash_table_destroy(data_can_interfaces_by_name);
data_can_interfaces_by_name = NULL;
}
/* create new hash table */
data_can_interfaces_by_id = g_hash_table_new_full(g_int_hash, g_int_equal, &can_free_key, NULL);
data_can_interfaces_by_name = g_hash_table_new_full(g_str_hash, g_str_equal, &can_free_key, NULL);
if (data_can_interfaces_by_id == NULL || data_can_interfaces_by_name == NULL || interface_configs == NULL || interface_config_num == 0) {
return;
}
for (i = 0; i < interface_config_num; i++) {
if (interface_configs[i].interface_id != 0xfffffff) {
key_id = wmem_new(wmem_epan_scope(), int);
*key_id = interface_configs[i].interface_id;
g_hash_table_insert(data_can_interfaces_by_id, key_id, &interface_configs[i]);
}
if (interface_configs[i].interface_name != NULL && interface_configs[i].interface_name[0] != 0) {
key_name = wmem_strdup(wmem_epan_scope(), interface_configs[i].interface_name);
g_hash_table_insert(data_can_interfaces_by_name, key_name, &interface_configs[i]);
}
}
}
/* We match based on the config in the following order:
* - interface_name matches and interface_id matches
* - interface_name matches and interface_id = 0xffffffff
* - interface_name = "" and interface_id matches
*/
static guint
get_bus_id(packet_info *pinfo) {
guint32 interface_id = pinfo->rec->rec_header.packet_header.interface_id;
const char *interface_name = epan_get_interface_name(pinfo->epan, interface_id);
interface_config_t *tmp = NULL;
if (!(pinfo->rec->presence_flags & WTAP_HAS_INTERFACE_ID)) {
return 0;
}
if (interface_name != NULL && interface_name[0] != 0) {
tmp = ht_lookup_interface_config_by_name(interface_name);
if (tmp != NULL && (tmp->interface_id == 0xffffffff || tmp->interface_id == interface_id)) {
/* name + id match or name match and id = any */
return tmp->bus_id;
}
tmp = ht_lookup_interface_config_by_id(interface_id);
if (tmp != NULL && (tmp->interface_name == NULL || tmp->interface_name[0] == 0)) {
/* id matches and name is any */
return tmp->bus_id;
}
}
/* we found nothing */
return 0;
}
gboolean
socketcan_call_subdissectors(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree, struct can_info* can_info, const gboolean use_heuristics_first)
{
dissector_table_t effective_can_id_dissector_table = (can_info->id & CAN_EFF_FLAG) ? can_extended_id_dissector_table : can_id_dissector_table;
guint32 effective_can_id = (can_info->id & CAN_EFF_FLAG) ? can_info->id & CAN_EFF_MASK : can_info->id & CAN_SFF_MASK;
if (!dissector_try_uint_new(effective_can_id_dissector_table, effective_can_id, tvb, pinfo, tree, TRUE, can_info))
{
if (!use_heuristics_first)
{
if (!dissector_try_payload_new(subdissector_table, tvb, pinfo, tree, TRUE, can_info))
{
if (!dissector_try_heuristic(heur_subdissector_list, tvb, pinfo, tree, &heur_dtbl_entry, can_info))
{
return FALSE;
}
}
}
else
{
if (!dissector_try_heuristic(heur_subdissector_list, tvb, pinfo, tree, &heur_dtbl_entry, can_info))
{
if (!dissector_try_payload_new(subdissector_table, tvb, pinfo, tree, FALSE, can_info))
{
return FALSE;
}
}
}
}
return TRUE;
}
/*
* Either:
*
* 1) a given SocketCAN frame is known to contain a classic CAN
* packet based on information outside the SocketCAN header;
*
* 2) a given SocketCAN frame is known to contain a CAN FD
* packet based on information outside the SocketCAN header;
*
* 3) we don't know whether the given SocketCAN frame is a
* classic CAN packet or a CAN FD packet, and will have
* to check the CANFD_FDF bit in the "FD flags" field of
* the SocketCAN headder to determine that.
*/
typedef enum {
PACKET_TYPE_CAN,
PACKET_TYPE_CAN_FD,
PACKET_TYPE_UNKNOWN
} can_packet_type_t;
static int
dissect_socketcan_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
guint encoding, can_packet_type_t can_packet_type)
{
proto_tree *can_tree;
proto_item *ti;
guint8 frame_type;
struct can_info can_info;
int * const *can_flags;
static int * const can_std_flags[] = {
&hf_can_infoent_std,
&hf_can_extflag,
&hf_can_rtrflag,
&hf_can_errflag,
NULL,
};
static int * const can_ext_flags[] = {
&hf_can_infoent_ext,
&hf_can_extflag,
&hf_can_rtrflag,
&hf_can_errflag,
NULL,
};
static int * const can_std_flags_fd[] = {
&hf_can_infoent_std,
&hf_can_extflag,
NULL,
};
static int * const can_ext_flags_fd[] = {
&hf_can_infoent_ext,
&hf_can_extflag,
NULL,
};
static int * const canfd_flag_fields[] = {
&hf_canfd_brsflag,
&hf_canfd_esiflag,
NULL,
};
static int * const can_err_flags[] = {
&hf_can_errflag,
&hf_can_err_tx_timeout,
&hf_can_err_lostarb,
&hf_can_err_ctrl,
&hf_can_err_prot,
&hf_can_err_trx,
&hf_can_err_ack,
&hf_can_err_busoff,
&hf_can_err_buserror,
&hf_can_err_restarted,
&hf_can_err_reserved,
NULL,
};
can_info.id = tvb_get_guint32(tvb, 0, encoding);
can_info.len = tvb_get_guint8(tvb, CAN_LEN_OFFSET);
/*
* If we weren't told the type of this frame, check
* whether the CANFD_FDF flag is set in the FD flags
* field of the header; if so, it's a CAN FD frame.
* otherwise, it's a CAN frame.
*
* However, trust the CANFD_FDF flag only if the only
* bits set in the FD flags field are the known bits,
* and the two bytes following that field are both
* zero. This is because some older LINKTYPE_CAN_SOCKETCAN
* frames had uninitialized junk in the FD flags field,
* so we treat a frame with what appears to be uninitialized
* junk as being CAN rather than CAN FD, under the assumption
* that the CANFD_FDF bit is set because the field is
* uninitialized, not because it was explicitly set because
* it's a CAN FD frame. At least some newer code that sets
* that flag also makes sure that the fields in question are
* initialized, so we assume that if they're not initialized
* the code is older code that didn't support CAN FD.
*/
if (can_packet_type == PACKET_TYPE_UNKNOWN) {
guint8 fd_flags;
fd_flags = tvb_get_guint8(tvb, CANFD_FLAG_OFFSET);
if ((fd_flags & CANFD_FDF) &&
((fd_flags & ~(CANFD_BRS|CANFD_ESI|CANFD_FDF)) == 0) &&
tvb_get_guint8(tvb, CANFD_FLAG_OFFSET + 1) == 0 &&
tvb_get_guint8(tvb, CANFD_FLAG_OFFSET + 2) == 0)
can_packet_type = PACKET_TYPE_CAN_FD;
else
can_packet_type = PACKET_TYPE_CAN;
}
can_info.fd = (can_packet_type == PACKET_TYPE_CAN_FD);
can_info.bus_id = get_bus_id(pinfo);
/* Error Message Frames are only encapsulated in Classic CAN frames */
if (can_packet_type == PACKET_TYPE_CAN && (can_info.id & CAN_ERR_FLAG))
{
frame_type = LINUX_CAN_ERR;
can_flags = can_err_flags;
}
else if (can_info.id & CAN_EFF_FLAG)
{
frame_type = LINUX_CAN_EXT;
can_info.id &= (CAN_EFF_MASK | CAN_FLAG_MASK);
can_flags = (can_packet_type == PACKET_TYPE_CAN_FD) ? can_ext_flags_fd : can_ext_flags;
}
else
{
frame_type = LINUX_CAN_STD;
can_info.id &= (CAN_SFF_MASK | CAN_FLAG_MASK);
can_flags = (can_packet_type == PACKET_TYPE_CAN_FD) ? can_std_flags_fd : can_std_flags;
}
col_set_str(pinfo->cinfo, COL_PROTOCOL, (can_packet_type == PACKET_TYPE_CAN_FD) ? "CANFD" : "CAN");
col_clear(pinfo->cinfo, COL_INFO);
guint32 effective_can_id = (can_info.id & CAN_EFF_FLAG) ? can_info.id & CAN_EFF_MASK : can_info.id & CAN_SFF_MASK;
char* id_name = (can_info.id & CAN_EFF_FLAG) ? "Ext. ID" : "ID";
col_add_fstr(pinfo->cinfo, COL_INFO, "%s: %d (0x%" PRIx32 "), Length: %d", id_name, effective_can_id, effective_can_id, can_info.len);
ti = proto_tree_add_item(tree, (can_packet_type == PACKET_TYPE_CAN_FD) ? proto_canfd : proto_can, tvb, 0, -1, ENC_NA);
can_tree = proto_item_add_subtree(ti, (can_packet_type == PACKET_TYPE_CAN_FD) ? ett_can_fd : ett_can);
proto_item_append_text(can_tree, ", %s: %d (0x%" PRIx32 "), Length: %d", id_name, effective_can_id, effective_can_id, can_info.len);
proto_tree_add_bitmask_list(can_tree, tvb, 0, 4, can_flags, encoding);
proto_tree_add_item(can_tree, hf_can_len, tvb, CAN_LEN_OFFSET, 1, ENC_NA);
if (frame_type == LINUX_CAN_ERR && can_info.len != CAN_ERR_DLC)
{
proto_tree_add_expert(tree, pinfo, &ei_can_err_dlc_mismatch, tvb, CAN_LEN_OFFSET, 1);
}
if (can_packet_type == PACKET_TYPE_CAN_FD) {
proto_tree_add_bitmask_list(can_tree, tvb, CANFD_FLAG_OFFSET, 1, canfd_flag_fields, ENC_NA);
proto_tree_add_item(can_tree, hf_can_reserved, tvb, CANFD_FLAG_OFFSET+1, 2, ENC_NA);
} else
proto_tree_add_item(can_tree, hf_can_reserved, tvb, CANFD_FLAG_OFFSET, 3, ENC_NA);
if (frame_type == LINUX_CAN_ERR)
{
int * const *flag;
const char *sepa = ": ";
col_set_str(pinfo->cinfo, COL_INFO, "ERR");
for (flag = can_err_flags; *flag; flag++)
{
header_field_info *hfi;
hfi = proto_registrar_get_nth(**flag);
if (!hfi)
continue;
if ((can_info.id & hfi->bitmask & ~CAN_FLAG_MASK) == 0)
continue;
col_append_sep_str(pinfo->cinfo, COL_INFO, sepa, hfi->name);
sepa = ", ";
}
if (can_info.id & CAN_ERR_LOSTARB)
proto_tree_add_item(can_tree, hf_can_err_lostarb_bit_number, tvb, CAN_DATA_OFFSET+0, 1, ENC_NA);
if (can_info.id & CAN_ERR_CTRL)
{
static int * const can_err_ctrl_flags[] = {
&hf_can_err_ctrl_rx_overflow,
&hf_can_err_ctrl_tx_overflow,
&hf_can_err_ctrl_rx_warning,
&hf_can_err_ctrl_tx_warning,
&hf_can_err_ctrl_rx_passive,
&hf_can_err_ctrl_tx_passive,
&hf_can_err_ctrl_active,
NULL,
};
proto_tree_add_bitmask_list(can_tree, tvb, CAN_DATA_OFFSET+1, 1, can_err_ctrl_flags, ENC_NA);
}
if (can_info.id & CAN_ERR_PROT)
{
static int * const can_err_prot_error_type_flags[] = {
&hf_can_err_prot_error_type_bit,
&hf_can_err_prot_error_type_form,
&hf_can_err_prot_error_type_stuff,
&hf_can_err_prot_error_type_bit0,
&hf_can_err_prot_error_type_bit1,
&hf_can_err_prot_error_type_overload,
&hf_can_err_prot_error_type_active,
&hf_can_err_prot_error_type_tx,
NULL
};
proto_tree_add_bitmask_list(can_tree, tvb, CAN_DATA_OFFSET+2, 1, can_err_prot_error_type_flags, ENC_NA);
proto_tree_add_item(can_tree, hf_can_err_prot_error_location, tvb, CAN_DATA_OFFSET+3, 1, ENC_NA);
}
if (can_info.id & CAN_ERR_TRX)
{
proto_tree_add_item(can_tree, hf_can_err_trx_canh, tvb, CAN_DATA_OFFSET+4, 1, ENC_NA);
proto_tree_add_item(can_tree, hf_can_err_trx_canl, tvb, CAN_DATA_OFFSET+4, 1, ENC_NA);
}
proto_tree_add_item(can_tree, hf_can_err_ctrl_specific, tvb, CAN_DATA_OFFSET+5, 3, ENC_NA);
}
else
{
tvbuff_t *next_tvb;
if (can_info.id & CAN_RTR_FLAG)
{
col_append_str(pinfo->cinfo, COL_INFO, "(Remote Transmission Request)");
}
next_tvb = tvb_new_subset_length(tvb, CAN_DATA_OFFSET, can_info.len);
if (!socketcan_call_subdissectors(next_tvb, pinfo, tree, &can_info, heuristic_first))
{
call_data_dissector(next_tvb, pinfo, tree);
}
}
if (tvb_captured_length_remaining(tvb, CAN_DATA_OFFSET+can_info.len) > 0)
{
proto_tree_add_item(can_tree, hf_can_padding, tvb, CAN_DATA_OFFSET+can_info.len, -1, ENC_NA);
}
return tvb_captured_length(tvb);
}
static int
dissect_socketcan_bigendian(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
void* data _U_)
{
return dissect_socketcan_common(tvb, pinfo, tree,
byte_swap ? ENC_LITTLE_ENDIAN : ENC_BIG_ENDIAN, PACKET_TYPE_UNKNOWN);
}
static int
dissect_socketcan_classic(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
void* data _U_)
{
return dissect_socketcan_common(tvb, pinfo, tree,
byte_swap ? ENC_ANTI_HOST_ENDIAN : ENC_HOST_ENDIAN, PACKET_TYPE_CAN);
}
static int
dissect_socketcan_fd(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
void* data _U_)
{
return dissect_socketcan_common(tvb, pinfo, tree,
byte_swap ? ENC_ANTI_HOST_ENDIAN : ENC_HOST_ENDIAN, PACKET_TYPE_CAN_FD);
}
void
proto_register_socketcan(void)
{
static hf_register_info hf[] = {
{
&hf_can_infoent_ext,
{
"ID", "can.id",
FT_UINT32, BASE_DEC_HEX,
NULL, CAN_EFF_MASK,
NULL, HFILL
}
},
{
&hf_can_infoent_std,
{
"ID", "can.id",
FT_UINT32, BASE_DEC_HEX,
NULL, CAN_SFF_MASK,
NULL, HFILL
}
},
{
&hf_can_extflag,
{
"Extended Flag", "can.flags.xtd",
FT_BOOLEAN, 32,
NULL, CAN_EFF_FLAG,
NULL, HFILL
}
},
{
&hf_can_rtrflag,
{
"Remote Transmission Request Flag", "can.flags.rtr",
FT_BOOLEAN, 32,
NULL, CAN_RTR_FLAG,
NULL, HFILL
}
},
{
&hf_can_errflag,
{
"Error Message Flag", "can.flags.err",
FT_BOOLEAN, 32,
NULL, CAN_ERR_FLAG,
NULL, HFILL
}
},
{
&hf_can_len,
{
"Frame-Length", "can.len",
FT_UINT8, BASE_DEC,
NULL, 0x0,
NULL, HFILL
}
},
{
&hf_can_reserved,
{
"Reserved", "can.reserved",
FT_BYTES, BASE_NONE,
NULL, 0x0,
NULL, HFILL
}
},
{
&hf_can_padding,
{
"Padding", "can.padding",
FT_BYTES, BASE_NONE,
NULL, 0x0,
NULL, HFILL
}
},
{
&hf_canfd_brsflag,
{
"Bit Rate Setting", "canfd.flags.brs",
FT_BOOLEAN, 8,
NULL, CANFD_BRS,
NULL, HFILL
}
},
{
&hf_canfd_esiflag,
{
"Error State Indicator", "canfd.flags.esi",
FT_BOOLEAN, 8,
NULL, CANFD_ESI,
NULL, HFILL
}
},
{
&hf_can_err_tx_timeout,
{
"Transmit timeout", "can.err.tx_timeout",
FT_BOOLEAN, 32,
NULL, CAN_ERR_TX_TIMEOUT,
NULL, HFILL
}
},
{
&hf_can_err_lostarb,
{
"Lost arbitration", "can.err.lostarb",
FT_BOOLEAN, 32,
NULL, CAN_ERR_LOSTARB,
NULL, HFILL
}
},
{
&hf_can_err_ctrl,
{
"Controller problems", "can.err.ctrl",
FT_BOOLEAN, 32,
NULL, CAN_ERR_CTRL,
NULL, HFILL
}
},
{
&hf_can_err_prot,
{
"Protocol violation", "can.err.prot",
FT_BOOLEAN, 32,
NULL, CAN_ERR_PROT,
NULL, HFILL
}
},
{
&hf_can_err_trx,
{
"Transceiver status", "can.err.trx",
FT_BOOLEAN, 32,
NULL, CAN_ERR_TRX,
NULL, HFILL
}
},
{
&hf_can_err_ack,
{
"No acknowledgement", "can.err.ack",
FT_BOOLEAN, 32,
NULL, CAN_ERR_ACK,
NULL, HFILL
}
},
{
&hf_can_err_busoff,
{
"Bus off", "can.err.busoff",
FT_BOOLEAN, 32,
NULL, CAN_ERR_BUSOFF,
NULL, HFILL
}
},
{
&hf_can_err_buserror,
{
"Bus error", "can.err.buserror",
FT_BOOLEAN, 32,
NULL, CAN_ERR_BUSERROR,
NULL, HFILL
}
},
{
&hf_can_err_restarted,
{
"Controller restarted", "can.err.restarted",
FT_BOOLEAN, 32,
NULL, CAN_ERR_RESTARTED,
NULL, HFILL
}
},
{
&hf_can_err_reserved,
{
"Reserved", "can.err.reserved",
FT_UINT32, BASE_HEX,
NULL, CAN_ERR_RESERVED,
NULL, HFILL
}
},
{
&hf_can_err_lostarb_bit_number,
{
"Lost arbitration in bit number", "can.err.lostarb.bitnum",
FT_UINT8, BASE_DEC,
NULL, 0,
NULL, HFILL
}
},
{
&hf_can_err_ctrl_rx_overflow,
{
"RX buffer overflow", "can.err.ctrl.rx_overflow",
FT_BOOLEAN, 8,
NULL, 0x01,
NULL, HFILL
}
},
{
&hf_can_err_ctrl_tx_overflow,
{
"TX buffer overflow", "can.err.ctrl.tx_overflow",
FT_BOOLEAN, 8,
NULL, 0x02,
NULL, HFILL
}
},
{
&hf_can_err_ctrl_rx_warning,
{
"Reached warning level for RX errors", "can.err.ctrl.rx_warning",
FT_BOOLEAN, 8,
NULL, 0x04,
NULL, HFILL
}
},
{
&hf_can_err_ctrl_tx_warning,
{
"Reached warning level for TX errors", "can.err.ctrl.tx_warning",
FT_BOOLEAN, 8,
NULL, 0x08,
NULL, HFILL
}
},
{
&hf_can_err_ctrl_rx_passive,
{
"Reached error passive status RX", "can.err.ctrl.rx_passive",
FT_BOOLEAN, 8,
NULL, 0x10,
NULL, HFILL
}
},
{
&hf_can_err_ctrl_tx_passive,
{
"Reached error passive status TX", "can.err.ctrl.tx_passive",
FT_BOOLEAN, 8,
NULL, 0x20,
NULL, HFILL
}
},
{
&hf_can_err_ctrl_active,
{
"Recovered to error active state", "can.err.ctrl.active",
FT_BOOLEAN, 8,
NULL, 0x40,
NULL, HFILL
}
},
{
&hf_can_err_prot_error_type_bit,
{
"Single bit error", "can.err.prot.type.bit",
FT_BOOLEAN, 8,
NULL, 0x01,
NULL, HFILL
}
},
{
&hf_can_err_prot_error_type_form,
{
"Frame format error", "can.err.prot.type.form",
FT_BOOLEAN, 8,
NULL, 0x02,
NULL, HFILL
}
},
{
&hf_can_err_prot_error_type_stuff,
{
"Bit stuffing error", "can.err.prot.type.stuff",
FT_BOOLEAN, 8,
NULL, 0x04,
NULL, HFILL
}
},
{
&hf_can_err_prot_error_type_bit0,
{
"Unable to send dominant bit", "can.err.prot.type.bit0",
FT_BOOLEAN, 8,
NULL, 0x08,
NULL, HFILL
}
},
{
&hf_can_err_prot_error_type_bit1,
{
"Unable to send recessive bit", "can.err.prot.type.bit1",
FT_BOOLEAN, 8,
NULL, 0x10,
NULL, HFILL
}
},
{
&hf_can_err_prot_error_type_overload,
{
"Bus overload", "can.err.prot.type.overload",
FT_BOOLEAN, 8,
NULL, 0x20,
NULL, HFILL
}
},
{
&hf_can_err_prot_error_type_active,
{
"Active error announcement", "can.err.prot.type.active",
FT_BOOLEAN, 8,
NULL, 0x40,
NULL, HFILL
}
},
{
&hf_can_err_prot_error_type_tx,
{
"Error occurred on transmission", "can.err.prot.type.tx",
FT_BOOLEAN, 8,
NULL, 0x80,
NULL, HFILL
}
},
{
&hf_can_err_prot_error_location,
{
"Protocol error location", "can.err.prot.location",
FT_UINT8, BASE_DEC,
VALS(can_err_prot_error_location_vals), 0,
NULL, HFILL
}
},
{
&hf_can_err_trx_canh,
{
"Transceiver CANH status", "can.err.trx.canh",
FT_UINT8, BASE_DEC,
VALS(can_err_trx_canh_vals), 0x0F,
NULL, HFILL
}
},
{
&hf_can_err_trx_canl,
{
"Transceiver CANL status", "can.err.trx.canl",
FT_UINT8, BASE_DEC,
VALS(can_err_trx_canl_vals), 0xF0,
NULL, HFILL
}
},
{
&hf_can_err_ctrl_specific,
{
"Controller specific data", "can.err.ctrl_specific",
FT_BYTES, SEP_SPACE,
NULL, 0,
NULL, HFILL
}
},
};
uat_t *can_interface_uat = NULL;
/* Setup protocol subtree array */
static gint *ett[] =
{
&ett_can,
&ett_can_fd
};
static ei_register_info ei[] = {
{
&ei_can_err_dlc_mismatch,
{
"can.err.dlc_mismatch", PI_MALFORMED, PI_ERROR,
"ERROR: DLC mismatch", EXPFILL
}
}
};
module_t *can_module;
proto_can = proto_register_protocol("Controller Area Network", "CAN", "can");
/*
* "can-hostendian" is a legacy name (there never was, in any libpcap
* release, a SocketCAN LINKTYPE_ value for a host-endian CAN ID
* and flags field); we need to keep it around in case some candump
* or Busmaster capture that was saved as a pcap or pcapng file,
* as those use a linktype of LINKTYPE_WIRESHARK_UPPER_PDU with
* "can-hostendian" as the dissector name.
*/
socketcan_classic_handle = register_dissector("can-hostendian", dissect_socketcan_classic, proto_can);
proto_canfd = proto_register_protocol("Controller Area Network FD", "CANFD", "canfd");
socketcan_fd_handle = register_dissector("canfd", dissect_socketcan_fd, proto_canfd);
proto_register_field_array(proto_can, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_register_field_array(expert_register_protocol(proto_can), ei, array_length(ei));
can_module = prefs_register_protocol(proto_can, NULL);
prefs_register_obsolete_preference(can_module, "protocol");
prefs_register_bool_preference(can_module, "byte_swap",
"Byte-swap the CAN ID/flags field",
"Whether the CAN ID/flags field should be byte-swapped",
&byte_swap);
prefs_register_bool_preference(can_module, "try_heuristic_first",
"Try heuristic sub-dissectors first",
"Try to decode a packet using an heuristic sub-dissector"
" before using a sub-dissector registered to \"decode as\"",
&heuristic_first);
can_id_dissector_table = register_dissector_table("can.id", "CAN ID", proto_can, FT_UINT32, BASE_DEC);
can_extended_id_dissector_table = register_dissector_table("can.extended_id", "CAN Extended ID", proto_can, FT_UINT32, BASE_DEC);
subdissector_table = register_decode_as_next_proto(proto_can, "can.subdissector", "CAN next level dissector", NULL);
heur_subdissector_list = register_heur_dissector_list("can", proto_can);
static uat_field_t can_interface_mapping_uat_fields[] = {
UAT_FLD_HEX(interface_configs, interface_id, "Interface ID", "ID of the Interface with 0xffffffff = any (hex uint32 without leading 0x)"),
UAT_FLD_CSTRING(interface_configs, interface_name, "Interface Name", "Name of the Interface, empty = any (string)"),
UAT_FLD_HEX(interface_configs, bus_id, "Bus ID", "Bus ID of the Interface (hex uint16 without leading 0x)"),
UAT_END_FIELDS
};
can_interface_uat = uat_new("CAN Interface Mapping",
sizeof(interface_config_t), /* record size */
DATAFILE_CAN_INTERFACE_MAPPING, /* filename */
TRUE, /* from profile */
(void**)&interface_configs, /* data_ptr */
&interface_config_num, /* numitems_ptr */
UAT_AFFECTS_DISSECTION, /* but not fields */
NULL, /* help */
copy_interface_config_cb, /* copy callback */
update_interface_config, /* update callback */
free_interface_config_cb, /* free callback */
post_update_can_interfaces_cb, /* post update callback */
NULL, /* reset callback */
can_interface_mapping_uat_fields /* UAT field definitions */
);
prefs_register_uat_preference(can_module, "_can_interface_mapping", "Interface Mapping",
"A table to define the mapping between interface and Bus ID.", can_interface_uat);
}
void
proto_reg_handoff_socketcan(void)
{
dissector_handle_t socketcan_bigendian_handle;
socketcan_bigendian_handle = create_dissector_handle(dissect_socketcan_bigendian, proto_can);
dissector_add_uint("wtap_encap", WTAP_ENCAP_SOCKETCAN, socketcan_bigendian_handle);
dissector_add_uint("sll.ltype", LINUX_SLL_P_CAN, socketcan_classic_handle);
dissector_add_uint("sll.ltype", LINUX_SLL_P_CANFD, socketcan_fd_handle);
}
/*
* 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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