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Subject[PATCH v2 1/3] tpm: vtpm_proxy: Add ioctl to get supported flags
Date
Add an ioctl to get the supported flags.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
---
drivers/char/tpm/tpm_vtpm_proxy.c | 29 +++++++++++++++++++++++++++++
include/uapi/linux/vtpm_proxy.h | 11 +++++++++++
2 files changed, 40 insertions(+)

diff --git a/drivers/char/tpm/tpm_vtpm_proxy.c b/drivers/char/tpm/tpm_vtpm_proxy.c
index 751059d..fb4d207 100644
--- a/drivers/char/tpm/tpm_vtpm_proxy.c
+++ b/drivers/char/tpm/tpm_vtpm_proxy.c
@@ -592,6 +592,33 @@ static long vtpmx_ioc_new_dev(struct file *file, unsigned int ioctl,
return 0;
}

+/**
+ * vtpmx_ioc_get_supt_flags - handler for the %VTPM_PROXY_IOC_GET_SUPT_FLAGS
+ * ioctl
+ * @file: /dev/vtpmx
+ * @ioctl: the ioctl number
+ * @arg: pointer to the struct vtpmx_proxy_get_supt_flags
+ *
+ * Return the bitfield of supported flags
+ */
+static long vtpmx_ioc_get_supt_flags(struct file *file, unsigned int ioctl,
+ unsigned long arg)
+{
+ void __user *argp = (void __user *)arg;
+ struct vtpm_proxy_supt_flags __user *vtpm_supt_flags_p = argp;
+ struct vtpm_proxy_supt_flags flags = {
+ .flags = VTPM_PROXY_FLAGS_ALL,
+ };
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (copy_to_user(vtpm_supt_flags_p, &flags, sizeof(flags)))
+ return -EFAULT;
+
+ return 0;
+}
+
/*
* vtpmx_fops_ioctl: ioctl on /dev/vtpmx
*
@@ -604,6 +631,8 @@ static long vtpmx_fops_ioctl(struct file *f, unsigned int ioctl,
switch (ioctl) {
case VTPM_PROXY_IOC_NEW_DEV:
return vtpmx_ioc_new_dev(f, ioctl, arg);
+ case VTPM_PROXY_IOC_GET_SUPT_FLAGS:
+ return vtpmx_ioc_get_supt_flags(f, ioctl, arg);
default:
return -ENOIOCTLCMD;
}
diff --git a/include/uapi/linux/vtpm_proxy.h b/include/uapi/linux/vtpm_proxy.h
index a69e991..83e64e7 100644
--- a/include/uapi/linux/vtpm_proxy.h
+++ b/include/uapi/linux/vtpm_proxy.h
@@ -44,6 +44,17 @@ struct vtpm_proxy_new_dev {
__u32 minor; /* output */
};

+/**
+ * struct vtpm_proxy_supt_flags - parameter structure for the
+ * %VTPM_PROXY_IOC_GET_SUPT_FLAGS ioctl
+ * @flags: flags supported by the vtpm proxy driver
+ */
+struct vtpm_proxy_supt_flags {
+ __u32 flags; /* output */
+};
+
#define VTPM_PROXY_IOC_NEW_DEV _IOWR(0xa1, 0x00, struct vtpm_proxy_new_dev)
+#define VTPM_PROXY_IOC_GET_SUPT_FLAGS \
+ _IOR(0xa1, 0x01, struct vtpm_proxy_supt_flags)

#endif /* _UAPI_LINUX_VTPM_PROXY_H */
--
2.4.3
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