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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __TSM_H
#define __TSM_H
#include <linux/sizes.h>
#include <linux/types.h>
#include <linux/uuid.h>
#define TSM_INBLOB_MAX 64
#define TSM_OUTBLOB_MAX SZ_32K
/*
* Privilege level is a nested permission concept to allow confidential
* guests to partition address space, 4-levels are supported.
*/
#define TSM_PRIVLEVEL_MAX 3
/**
* struct tsm_desc - option descriptor for generating tsm report blobs
* @privlevel: optional privilege level to associate with @outblob
* @inblob_len: sizeof @inblob
* @inblob: arbitrary input data
* @service_provider: optional name of where to obtain the tsm report blob
* @service_guid: optional service-provider service guid to attest
* @service_manifest_version: optional service-provider service manifest version requested
*/
struct tsm_desc {
unsigned int privlevel;
size_t inblob_len;
u8 inblob[TSM_INBLOB_MAX];
char *service_provider;
guid_t service_guid;
unsigned int service_manifest_version;
};
/**
* struct tsm_report - track state of report generation relative to options
* @desc: input parameters to @report_new()
* @outblob_len: sizeof(@outblob)
* @outblob: generated evidence to provider to the attestation agent
* @auxblob_len: sizeof(@auxblob)
* @auxblob: (optional) auxiliary data to the report (e.g. certificate data)
* @manifestblob_len: sizeof(@manifestblob)
* @manifestblob: (optional) manifest data associated with the report
*/
struct tsm_report {
struct tsm_desc desc;
size_t outblob_len;
u8 *outblob;
size_t auxblob_len;
u8 *auxblob;
size_t manifestblob_len;
u8 *manifestblob;
};
/**
* enum tsm_attr_index - index used to reference report attributes
* @TSM_REPORT_GENERATION: index of the report generation number attribute
* @TSM_REPORT_PROVIDER: index of the provider name attribute
* @TSM_REPORT_PRIVLEVEL: index of the desired privilege level attribute
* @TSM_REPORT_PRIVLEVEL_FLOOR: index of the minimum allowed privileg level attribute
* @TSM_REPORT_SERVICE_PROVIDER: index of the service provider identifier attribute
* @TSM_REPORT_SERVICE_GUID: index of the service GUID attribute
* @TSM_REPORT_SERVICE_MANIFEST_VER: index of the service manifest version attribute
*/
enum tsm_attr_index {
TSM_REPORT_GENERATION,
TSM_REPORT_PROVIDER,
TSM_REPORT_PRIVLEVEL,
TSM_REPORT_PRIVLEVEL_FLOOR,
TSM_REPORT_SERVICE_PROVIDER,
TSM_REPORT_SERVICE_GUID,
TSM_REPORT_SERVICE_MANIFEST_VER,
};
/**
* enum tsm_bin_attr_index - index used to reference binary report attributes
* @TSM_REPORT_INBLOB: index of the binary report input attribute
* @TSM_REPORT_OUTBLOB: index of the binary report output attribute
* @TSM_REPORT_AUXBLOB: index of the binary auxiliary data attribute
* @TSM_REPORT_MANIFESTBLOB: index of the binary manifest data attribute
*/
enum tsm_bin_attr_index {
TSM_REPORT_INBLOB,
TSM_REPORT_OUTBLOB,
TSM_REPORT_AUXBLOB,
TSM_REPORT_MANIFESTBLOB,
};
/**
* struct tsm_ops - attributes and operations for tsm instances
* @name: tsm id reflected in /sys/kernel/config/tsm/report/$report/provider
* @privlevel_floor: convey base privlevel for nested scenarios
* @report_new: Populate @report with the report blob and auxblob
* (optional), return 0 on successful population, or -errno otherwise
* @report_attr_visible: show or hide a report attribute entry
* @report_bin_attr_visible: show or hide a report binary attribute entry
*
* Implementation specific ops, only one is expected to be registered at
* a time i.e. only one of "sev-guest", "tdx-guest", etc.
*/
struct tsm_ops {
const char *name;
unsigned int privlevel_floor;
int (*report_new)(struct tsm_report *report, void *data);
bool (*report_attr_visible)(int n);
bool (*report_bin_attr_visible)(int n);
};
int tsm_register(const struct tsm_ops *ops, void *priv);
int tsm_unregister(const struct tsm_ops *ops);
#endif /* __TSM_H */
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