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HiepLM
2025-12-29 16:21:22 +07:00
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Devices/Libraries/Systems/can-utils/isotptun.c Executable file
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/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
/*
* isotptun.c - IP over CAN ISO-TP (ISO15765-2) tunnel / proof-of-concept
*
* This program creates a Linux tunnel netdevice 'ctunX' and transfers the
* ethernet frames inside ISO15765-2 (unreliable) datagrams on CAN.
*
* Use e.g. "ifconfig ctun0 123.123.123.1 pointopoint 123.123.123.2 up"
* to create a point-to-point IP connection on CAN.
*
* Copyright (c) 2008 Volkswagen Group Electronic Research
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Volkswagen nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* Alternatively, provided that this notice is retained in full, this
* software may be distributed under the terms of the GNU General
* Public License ("GPL") version 2, in which case the provisions of the
* GPL apply INSTEAD OF those given above.
*
* The provided data structures and external interfaces from this code
* are not restricted to be used by modules with a GPL compatible license.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* Send feedback to <linux-can@vger.kernel.org>
*
*/
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <linux/can.h>
#include <linux/can/isotp.h>
#include <linux/if_tun.h>
/* Change this to whatever your daemon is called */
#define DAEMON_NAME "isotptun"
#define NO_CAN_ID 0xFFFFFFFFU
#define DEFAULT_NAME "ctun%d"
/* stay on 4095 bytes for the max. PDU length which is still much more than the standard ethernet MTU */
#define MAX_PDU_LENGTH 4095
#define BUF_LEN (MAX_PDU_LENGTH + 1)
static volatile int running = 1;
static volatile sig_atomic_t signal_num;
static void fake_syslog(int priority, const char *format, ...)
{
va_list ap;
fprintf(stderr, "[%d] ", priority);
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
fprintf(stderr, "\n");
}
typedef void (*syslog_t)(int priority, const char *format, ...);
static syslog_t syslogger = syslog;
void perror_syslog(const char *s)
{
const char *colon = s ? ": " : "";
syslogger(LOG_ERR, "%s%s%s", s, colon, strerror(errno));
}
void print_usage(char *prg)
{
fprintf(stderr, "%s - IP over CAN ISO-TP (ISO15765-2) tunnel / proof-of-concept.\n", prg);
fprintf(stderr, "\nUsage: %s [options] <CAN interface>\n\n", prg);
fprintf(stderr, "This program creates a Linux tunnel netdevice 'ctunX' and transfers the\n");
fprintf(stderr, "ethernet frames inside ISO15765-2 (unreliable) datagrams on CAN.\n\n");
fprintf(stderr, "Options:\n");
fprintf(stderr, " -s <can_id> (source can_id. Use 8 digits for extended IDs)\n");
fprintf(stderr, " -d <can_id> (destination can_id. Use 8 digits for extended IDs)\n");
fprintf(stderr, " -n <name> (name of created IP netdevice. Default: '%s')\n", DEFAULT_NAME);
fprintf(stderr, " -x <addr>[:<rxaddr>] (extended addressing / opt. separate rxaddr)\n");
fprintf(stderr, " -L <mtu>:<tx_dl>:<tx_flags> (link layer options for CAN FD)\n");
fprintf(stderr, " -p [tx]:[rx] (set and enable tx/rx padding bytes)\n");
fprintf(stderr, " -P <mode> (check rx padding for (l)ength (c)ontent (a)ll)\n");
fprintf(stderr, " -t <time ns> (transmit time in nanosecs)\n");
fprintf(stderr, " -b <bs> (blocksize. 0 = off)\n");
fprintf(stderr, " -m <val> (STmin in ms/ns. See spec.)\n");
fprintf(stderr, " -w <num> (max. wait frame transmissions.)\n");
fprintf(stderr, " -D (daemonize to background when tun device created)\n");
fprintf(stderr, " -h (half duplex mode.)\n");
fprintf(stderr, " -v (verbose mode. Print symbols for tunneled msgs.)\n");
fprintf(stderr, "\nCAN IDs and addresses are given and expected in hexadecimal values.\n");
fprintf(stderr, "Use e.g. 'ifconfig ctun0 123.123.123.1 pointopoint 123.123.123.2 up'\n");
fprintf(stderr, "to create a point-to-point IP connection on CAN.\n");
fprintf(stderr, "\n");
}
void sigterm(int signo)
{
running = 0;
signal_num = signo;
}
int main(int argc, char **argv)
{
fd_set rdfs;
int s, t;
struct sockaddr_can addr;
struct ifreq ifr;
static struct can_isotp_options opts;
static struct can_isotp_fc_options fcopts;
static struct can_isotp_ll_options llopts;
int opt, ret;
extern int optind, opterr, optopt;
static int verbose;
unsigned char buffer[BUF_LEN];
static char name[sizeof(ifr.ifr_name)] = DEFAULT_NAME;
int nbytes;
int run_as_daemon = 0;
addr.can_addr.tp.tx_id = addr.can_addr.tp.rx_id = NO_CAN_ID;
while ((opt = getopt(argc, argv, "s:d:n:x:p:P:t:b:m:whL:vD?")) != -1) {
switch (opt) {
case 's':
addr.can_addr.tp.tx_id = strtoul(optarg, NULL, 16);
if (strlen(optarg) > 7)
addr.can_addr.tp.tx_id |= CAN_EFF_FLAG;
break;
case 'd':
addr.can_addr.tp.rx_id = strtoul(optarg, NULL, 16);
if (strlen(optarg) > 7)
addr.can_addr.tp.rx_id |= CAN_EFF_FLAG;
break;
case 'n':
if (strlen(optarg) > sizeof(name) - 1) {
print_usage(basename(argv[0]));
exit(EXIT_FAILURE);
}
/* ensure string termination */
memset(name, 0, sizeof(name));
strncpy(name, optarg, sizeof(name) - 1);
break;
case 'x':
{
int elements = sscanf(optarg, "%hhx:%hhx",
&opts.ext_address,
&opts.rx_ext_address);
if (elements == 1)
opts.flags |= CAN_ISOTP_EXTEND_ADDR;
else if (elements == 2)
opts.flags |= (CAN_ISOTP_EXTEND_ADDR | CAN_ISOTP_RX_EXT_ADDR);
else {
fprintf(stderr, "incorrect extended addr values '%s'.\n", optarg);
print_usage(basename(argv[0]));
exit(EXIT_FAILURE);
}
break;
}
case 'p':
{
int elements = sscanf(optarg, "%hhx:%hhx",
&opts.txpad_content,
&opts.rxpad_content);
if (elements == 1)
opts.flags |= CAN_ISOTP_TX_PADDING;
else if (elements == 2)
opts.flags |= (CAN_ISOTP_TX_PADDING | CAN_ISOTP_RX_PADDING);
else if (sscanf(optarg, ":%hhx", &opts.rxpad_content) == 1)
opts.flags |= CAN_ISOTP_RX_PADDING;
else {
fprintf(stderr, "incorrect padding values '%s'.\n", optarg);
print_usage(basename(argv[0]));
exit(EXIT_FAILURE);
}
break;
}
case 'P':
if (optarg[0] == 'l')
opts.flags |= CAN_ISOTP_CHK_PAD_LEN;
else if (optarg[0] == 'c')
opts.flags |= CAN_ISOTP_CHK_PAD_DATA;
else if (optarg[0] == 'a')
opts.flags |= (CAN_ISOTP_CHK_PAD_LEN | CAN_ISOTP_CHK_PAD_DATA);
else {
fprintf(stderr, "unknown padding check option '%c'.\n", optarg[0]);
print_usage(basename(argv[0]));
exit(EXIT_FAILURE);
}
break;
case 't':
opts.frame_txtime = strtoul(optarg, NULL, 10);
break;
case 'b':
fcopts.bs = strtoul(optarg, NULL, 16) & 0xFF;
break;
case 'm':
fcopts.stmin = strtoul(optarg, NULL, 16) & 0xFF;
break;
case 'w':
fcopts.wftmax = strtoul(optarg, NULL, 16) & 0xFF;
break;
case 'h':
opts.flags |= CAN_ISOTP_HALF_DUPLEX;
break;
case 'L':
if (sscanf(optarg, "%hhu:%hhu:%hhu",
&llopts.mtu,
&llopts.tx_dl,
&llopts.tx_flags) != 3) {
fprintf(stderr, "unknown link layer options '%s'.\n", optarg);
print_usage(basename(argv[0]));
exit(EXIT_FAILURE);
}
break;
case 'v':
verbose = 1;
break;
case 'D':
run_as_daemon = 1;
break;
case '?':
print_usage(basename(argv[0]));
exit(EXIT_SUCCESS);
break;
default:
fprintf(stderr, "Unknown option %c\n", opt);
print_usage(basename(argv[0]));
exit(EXIT_FAILURE);
break;
}
}
if ((argc - optind != 1) ||
(addr.can_addr.tp.tx_id == NO_CAN_ID) ||
(addr.can_addr.tp.rx_id == NO_CAN_ID)) {
print_usage(basename(argv[0]));
exit(EXIT_FAILURE);
}
if (!run_as_daemon)
syslogger = fake_syslog;
/* Initialize the logging interface */
openlog(DAEMON_NAME, LOG_PID, LOG_LOCAL5);
if ((s = socket(PF_CAN, SOCK_DGRAM, CAN_ISOTP)) < 0) {
perror_syslog("socket");
exit(EXIT_FAILURE);
}
setsockopt(s, SOL_CAN_ISOTP, CAN_ISOTP_OPTS, &opts, sizeof(opts));
setsockopt(s, SOL_CAN_ISOTP, CAN_ISOTP_RECV_FC, &fcopts, sizeof(fcopts));
if (llopts.tx_dl) {
if (setsockopt(s, SOL_CAN_ISOTP, CAN_ISOTP_LL_OPTS, &llopts, sizeof(llopts)) < 0) {
perror_syslog("link layer sockopt");
exit(EXIT_FAILURE);
}
}
addr.can_family = AF_CAN;
addr.can_ifindex = if_nametoindex(argv[optind]);
if (!addr.can_ifindex) {
perror_syslog("if_nametoindex");
close(s);
exit(EXIT_FAILURE);
}
if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
perror_syslog("bind");
close(s);
exit(EXIT_FAILURE);
}
if ((t = open("/dev/net/tun", O_RDWR)) < 0) {
perror_syslog("open tunfd");
close(s);
close(t);
exit(EXIT_FAILURE);
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
/* string termination is ensured at commandline option handling */
strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
if (ioctl(t, TUNSETIFF, (void *) &ifr) < 0) {
perror_syslog("ioctl tunfd");
close(s);
close(t);
exit(EXIT_FAILURE);
}
/* Now the tun device exists. We can daemonize to let the
* parent continue and use the network interface. */
if (run_as_daemon) {
if (daemon(0, 0)) {
syslogger(LOG_ERR, "failed to daemonize");
exit(EXIT_FAILURE);
}
}
signal(SIGTERM, sigterm);
signal(SIGHUP, sigterm);
signal(SIGINT, sigterm);
while (running) {
FD_ZERO(&rdfs);
FD_SET(s, &rdfs);
FD_SET(t, &rdfs);
if ((ret = select(t+1, &rdfs, NULL, NULL, NULL)) < 0) {
perror_syslog("select");
continue;
}
if (FD_ISSET(s, &rdfs)) {
nbytes = read(s, buffer, BUF_LEN);
if (nbytes < 0) {
perror_syslog("read isotp socket");
return -1;
}
if (nbytes > MAX_PDU_LENGTH)
return -1;
ret = write(t, buffer, nbytes);
if (verbose) {
if (ret < 0 && errno == EAGAIN)
printf(";");
else
printf(",");
fflush(stdout);
}
}
if (FD_ISSET(t, &rdfs)) {
nbytes = read(t, buffer, BUF_LEN);
if (nbytes < 0) {
perror_syslog("read tunfd");
return -1;
}
if (nbytes > MAX_PDU_LENGTH)
return -1;
ret = write(s, buffer, nbytes);
if (verbose) {
if (ret < 0 && errno == EAGAIN)
printf(":");
else
printf(".");
fflush(stdout);
}
}
}
close(s);
close(t);
if (signal_num)
return 128 + signal_num;
return EXIT_SUCCESS;
}