MODULE_LICENSE("GPL");
+enum msg_types {
+ CAN_FRAME,
+};
+
+struct cegw_job
+{
+ struct kref refcount;
+ struct socket* can_sock;
+ struct socket* udp_sock;
+ __u32 udp_dstcnt;
+ struct sockaddr_in udp_dst[0];
+};
+
static int cegw_udp2can(void *data);
static int cegw_udp_send(struct socket *udp_sock, struct can_frame *cf,
struct sockaddr_in* addr);
static int cegw_udp_send(struct socket *udp_sock, struct can_frame *cf, struct sockaddr_in* addr)
{
struct msghdr mh;
- struct kvec vec;
+ struct kvec vec[2];
int err;
+ __u16 type = CAN_FRAME;
mh.msg_name = addr;
mh.msg_namelen = sizeof(*addr);
mh.msg_controllen = 0;
mh.msg_flags = 0;
- vec.iov_base = cf;
- vec.iov_len = sizeof(*cf);
+ type = cpu_to_be16(type);
+ vec[0].iov_base = &type;
+ vec[1].iov_base = cf;
+ vec[1].iov_len = sizeof(*cf);
- err = kernel_sendmsg(udp_sock, &mh, &vec, 1, sizeof(*cf));
+ err = kernel_sendmsg(udp_sock, &mh, vec, 2, sizeof(*cf));
return err;
}
static int cegw_udp2can(void *data)
{
struct can_frame cf;
- struct kvec vec;
+ struct kvec vec[2];
struct msghdr mh;
struct cegw_job *job = (struct cegw_job *)data;
struct socket *udp_sock = NULL, *can_sock = NULL;
int ret = 0;
+ __u16 type;
memset(&mh, 0, sizeof(mh));
udp_sock = job->udp_sock;
can_sock = job->can_sock;
while (1) {
- vec.iov_base = &cf;
- vec.iov_len = sizeof(cf);
- ret = kernel_recvmsg(udp_sock, &mh, &vec, 1,
- sizeof(cf), 0);
- if (ret < 1)
+ vec[0].iov_base = &type;
+ vec[0].iov_len = sizeof(type);
+ vec[1].iov_base = &cf;
+ vec[1].iov_len = sizeof(cf);
+ ret = kernel_recvmsg(udp_sock, &mh, vec, 2,
+ sizeof(cf), 0);
+ if (ret != sizeof(type) + sizeof(cf))
break;
- cf.can_id = be32_to_cpu(cf.can_id);
- cegw_can_send(can_sock, &cf);
+ type = be16_to_cpu(type);
+ switch (type) {
+ case CAN_FRAME:
+ cf.can_id = be32_to_cpu(cf.can_id);
+ cegw_can_send(can_sock, &cf);
+ default:;
+ }
}
cegw_thread_stop(job);
vec.iov_len = sizeof(cf);
ret = kernel_recvmsg(can_sock, &mh, &vec, 1,
- sizeof(cf), 0);
- if (ret < 1)
+ sizeof(cf), 0);
+ if (ret != sizeof(cf))
break;
cf.can_id = cpu_to_be32(cf.can_id);
struct cegw_job *job = (struct cegw_job *)data;
kref_init(&job->refcount);
- kref_get(&job->refcount);
task = kthread_run(cegw_udp2can, data, "canethgw_udp2can");
if (IS_ERR(task)) {
- kref_sub(&job->refcount, 2, cegw_job_release);
+ kref_put(&job->refcount, cegw_job_release);
return -ENOMEM;
}
+ kref_get(&job->refcount);
task = kthread_run(cegw_can2udp, data, "canethgw_can2udp");
if (IS_ERR(task)) {
cegw_thread_stop(job);
if (addrlen != sizeof(struct sockaddr_in))
return -EAFNOSUPPORT;
- /* */
job = kmalloc(GFP_KERNEL, sizeof(*job) + dstcnt*addrlen );
if (job == NULL)
return -ENOMEM;
return err;
}
+ if (job->can_sock->ops->family != AF_CAN ||
+ job->can_sock->type != CAN_RAW) {
+ kfree(job);
+ return -EBADF;
+ }
+
job->udp_dstcnt = dstcnt;
err = cegw_thread_start(job);
static long cegw_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
- int err;
+ long err;
switch (cmd) {
case CEGW_IOCTL_START: