-/*
- * $Id$
- */
-
/*
* isotptun.c - IP over CAN ISO-TP (ISO15765-2) tunnel / proof-of-concept
*
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
- * Send feedback to <socketcan-users@lists.berlios.de>
+ * Send feedback to <linux-can@vger.kernel.org>
*
*/
#include <string.h>
#include <libgen.h>
#include <errno.h>
+#include <signal.h>
#include <net/if.h>
#include <sys/types.h>
#include <linux/if_tun.h>
#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;
void print_usage(char *prg)
{
fprintf(stderr, "ethernet frames inside ISO15765-2 (unreliable) datagrams on CAN.\n\n");
fprintf(stderr, "Options: -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, " -x <addr> (extended addressing mode.)\n");
- fprintf(stderr, " -p <byte> (padding byte rx path)\n");
- fprintf(stderr, " -q <byte> (padding byte tx path)\n");
- fprintf(stderr, " -P <mode> (check padding. (l)ength (c)ontent (a)ll)\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, "\n");
}
+void sigterm(int signo)
+{
+ running = 0;
+}
+
int main(int argc, char **argv)
{
fd_set rdfs;
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 quit;
static int verbose;
-
- unsigned char buffer[4096];
+ unsigned char buffer[BUF_LEN];
+ static char name[IFNAMSIZ] = DEFAULT_NAME;
int nbytes;
+ signal(SIGTERM, sigterm);
+ signal(SIGHUP, sigterm);
+ signal(SIGINT, sigterm);
+
addr.can_addr.tp.tx_id = addr.can_addr.tp.rx_id = NO_CAN_ID;
- while ((opt = getopt(argc, argv, "s:d:x:p:q:P:t:b:m:whv")) != -1) {
+ while ((opt = getopt(argc, argv, "s:d:n:x:p:P:t:b:m:whL:v?")) != -1) {
switch (opt) {
case 's':
addr.can_addr.tp.tx_id = strtoul(optarg, (char **)NULL, 16);
addr.can_addr.tp.rx_id |= CAN_EFF_FLAG;
break;
- case 'x':
- opts.flags |= CAN_ISOTP_EXTEND_ADDR;
- opts.ext_address = strtoul(optarg, (char **)NULL, 16) & 0xFF;
+ case 'n':
+ strncpy(name, optarg, IFNAMSIZ-1);
break;
- case 'p':
- opts.flags |= CAN_ISOTP_RX_PADDING;
- opts.rxpad_content = strtoul(optarg, (char **)NULL, 16) & 0xFF;
+ 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 {
+ printf("incorrect extended addr values '%s'.\n", optarg);
+ print_usage(basename(argv[0]));
+ exit(0);
+ }
break;
+ }
- case 'q':
- opts.flags |= CAN_ISOTP_TX_PADDING;
- opts.txpad_content = strtoul(optarg, (char **)NULL, 16) & 0xFF;
+ 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 {
+ printf("incorrect padding values '%s'.\n", optarg);
+ print_usage(basename(argv[0]));
+ exit(0);
+ }
break;
+ }
case 'P':
if (optarg[0] == 'l')
else if (optarg[0] == 'c')
opts.flags |= CAN_ISOTP_CHK_PAD_DATA;
else if (optarg[0] == 'a')
- opts.flags |= (CAN_ISOTP_CHK_PAD_DATA | CAN_ISOTP_CHK_PAD_DATA);
+ opts.flags |= (CAN_ISOTP_CHK_PAD_LEN | CAN_ISOTP_CHK_PAD_DATA);
else {
printf("unknown padding check option '%c'.\n", optarg[0]);
print_usage(basename(argv[0]));
opts.flags |= CAN_ISOTP_HALF_DUPLEX;
break;
+ case 'L':
+ if (sscanf(optarg, "%hhu:%hhu:%hhu",
+ &llopts.mtu,
+ &llopts.tx_dl,
+ &llopts.tx_flags) != 3) {
+ printf("unknown link layer options '%s'.\n", optarg);
+ print_usage(basename(argv[0]));
+ exit(0);
+ }
+ break;
+
case 'v':
verbose = 1;
break;
+ case '?':
+ print_usage(basename(argv[0]));
+ exit(0);
+ break;
+
default:
fprintf(stderr, "Unknown option %c\n", opt);
print_usage(basename(argv[0]));
- exit(0);
+ exit(1);
break;
}
}
(addr.can_addr.tp.tx_id == NO_CAN_ID) ||
(addr.can_addr.tp.rx_id == NO_CAN_ID)) {
print_usage(basename(argv[0]));
- exit(0);
+ exit(1);
}
if ((s = socket(PF_CAN, SOCK_DGRAM, CAN_ISOTP)) < 0) {
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("link layer sockopt");
+ exit(1);
+ }
+ }
+
+ strncpy(ifr.ifr_name, argv[optind], IFNAMSIZ);
+ ifr.ifr_ifindex = if_nametoindex(ifr.ifr_name);
+ if (!ifr.ifr_ifindex) {
+ perror("if_nametoindex");
+ close(s);
+ exit(1);
+ }
+
addr.can_family = AF_CAN;
- strcpy(ifr.ifr_name, argv[optind]);
- ioctl(s, SIOCGIFINDEX, &ifr);
addr.can_ifindex = ifr.ifr_ifindex;
if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
- strncpy(ifr.ifr_name, "ctun%d", IFNAMSIZ);
+ strncpy(ifr.ifr_name, name, IFNAMSIZ - 1);
+ ifr.ifr_name[IFNAMSIZ - 1] = '\0';
if (ioctl(t, TUNSETIFF, (void *) &ifr) < 0) {
perror("ioctl tunfd");
exit(1);
}
- while (!quit) {
+ while (running) {
FD_ZERO(&rdfs);
FD_SET(s, &rdfs);
FD_SET(t, &rdfs);
- FD_SET(0, &rdfs);
if ((ret = select(t+1, &rdfs, NULL, NULL, NULL)) < 0) {
perror("select");
continue;
}
- if (FD_ISSET(0, &rdfs)) {
- getchar();
- quit = 1;
- printf("quit due to keyboard input.\n");
- }
-
if (FD_ISSET(s, &rdfs)) {
- nbytes = read(s, buffer, 4096);
+ nbytes = read(s, buffer, BUF_LEN);
if (nbytes < 0) {
perror("read isotp socket");
return -1;
}
- if (nbytes > 4095)
+ if (nbytes > MAX_PDU_LENGTH)
return -1;
ret = write(t, buffer, nbytes);
if (verbose) {
}
if (FD_ISSET(t, &rdfs)) {
- nbytes = read(t, buffer, 4096);
+ nbytes = read(t, buffer, BUF_LEN);
if (nbytes < 0) {
perror("read tunfd");
return -1;
}
- if (nbytes > 4095)
+ if (nbytes > MAX_PDU_LENGTH)
return -1;
ret = write(s, buffer, nbytes);
if (verbose) {
projects / can-utils.git / blobdiff