/*
* linux/include/linux/sunrpc/gss_api.h
*
* Somewhat simplified version of the gss api.
*
* Dug Song <[email protected]>
* Andy Adamson <[email protected]>
* Bruce Fields <[email protected]>
* Copyright (c) 2000 The Regents of the University of Michigan
*/

#ifndef _LINUX_SUNRPC_GSS_API_H
#define _LINUX_SUNRPC_GSS_API_H

#ifdef __KERNEL__
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/msg_prot.h>
#include <linux/uio.h>

/* The mechanism-independent gss-api context: */
struct gss_ctx {
struct gss_api_mech *mech_type;
void *internal_ctx_id;
};

#define GSS_C_NO_BUFFER ((struct xdr_netobj) 0)
#define GSS_C_NO_CONTEXT ((struct gss_ctx *) 0)
#define GSS_C_QOP_DEFAULT (0)

/*XXX arbitrary length - is this set somewhere? */
#define GSS_OID_MAX_LEN 32
struct rpcsec_gss_oid {
unsigned int len;
u8 data[GSS_OID_MAX_LEN];
};

/* From RFC 3530 */
struct rpcsec_gss_info {
struct rpcsec_gss_oid oid;
u32 qop;
u32 service;
};

/* gss-api prototypes; note that these are somewhat simplified versions of
* the prototypes specified in RFC 2744. */
int gss_import_sec_context(
const void* input_token,
size_t bufsize,
struct gss_api_mech *mech,
struct gss_ctx **ctx_id,
time_t *endtime,
gfp_t gfp_mask);
u32 gss_get_mic(
struct gss_ctx *ctx_id,
struct xdr_buf *message,
struct xdr_netobj *mic_token);
u32 gss_verify_mic(
struct gss_ctx *ctx_id,
struct xdr_buf *message,
struct xdr_netobj *mic_token);
u32 gss_wrap(
struct gss_ctx *ctx_id,
int offset,
struct xdr_buf *outbuf,
struct page **inpages);
u32 gss_unwrap(
struct gss_ctx *ctx_id,
int offset,
struct xdr_buf *inbuf);
u32 gss_delete_sec_context(
struct gss_ctx **ctx_id);

rpc_authflavor_t gss_svc_to_pseudoflavor(struct gss_api_mech *, u32 qop,
u32 service);
u32 gss_pseudoflavor_to_service(struct gss_api_mech *, u32 pseudoflavor);
char *gss_service_to_auth_domain_name(struct gss_api_mech *, u32 service);

struct pf_desc {
u32 pseudoflavor;
u32 qop;
u32 service;
char *name;
char *auth_domain_name;
};

/* Different mechanisms (e.g., krb5 or spkm3) may implement gss-api, and
* mechanisms may be dynamically registered or unregistered by modules. */

/* Each mechanism is described by the following struct: */
struct gss_api_mech {
struct list_head gm_list;
struct module *gm_owner;
struct rpcsec_gss_oid gm_oid;
char *gm_name;
const struct gss_api_ops *gm_ops;
/* pseudoflavors supported by this mechanism: */
int gm_pf_num;
struct pf_desc * gm_pfs;
/* Should the following be a callback operation instead? */
const char *gm_upcall_enctypes;
};

/* and must provide the following operations: */
struct gss_api_ops {
int (*gss_import_sec_context)(
const void *input_token,
size_t bufsize,
struct gss_ctx *ctx_id,
time_t *endtime,
gfp_t gfp_mask);
u32 (*gss_get_mic)(
struct gss_ctx *ctx_id,
struct xdr_buf *message,
struct xdr_netobj *mic_token);
u32 (*gss_verify_mic)(
struct gss_ctx *ctx_id,
struct xdr_buf *message,
struct xdr_netobj *mic_token);
u32 (*gss_wrap)(
struct gss_ctx *ctx_id,
int offset,
struct xdr_buf *outbuf,
struct page **inpages);
u32 (*gss_unwrap)(
struct gss_ctx *ctx_id,
int offset,
struct xdr_buf *buf);
void (*gss_delete_sec_context)(
void *internal_ctx_id);
};

int gss_mech_register(struct gss_api_mech *);
void gss_mech_unregister(struct gss_api_mech *);

/* returns a mechanism descriptor given an OID, and increments the mechanism's
* reference count. */
struct gss_api_mech * gss_mech_get_by_OID(struct rpcsec_gss_oid *);

/* Given a GSS security tuple, look up a pseudoflavor */
rpc_authflavor_t gss_mech_info2flavor(struct rpcsec_gss_info *);

/* Given a pseudoflavor, look up a GSS security tuple */
int gss_mech_flavor2info(rpc_authflavor_t, struct rpcsec_gss_info *);

/* Returns a reference to a mechanism, given a name like "krb5" etc. */
struct gss_api_mech *gss_mech_get_by_name(const char *);

/* Similar, but get by pseudoflavor. */
struct gss_api_mech *gss_mech_get_by_pseudoflavor(u32);

/* Fill in an array with a list of supported pseudoflavors */
int gss_mech_list_pseudoflavors(rpc_authflavor_t *, int);

struct gss_api_mech * gss_mech_get(struct gss_api_mech *);

/* For every successful gss_mech_get or gss_mech_get_by_* call there must be a
* corresponding call to gss_mech_put. */
void gss_mech_put(struct gss_api_mech *);

#endif /* __KERNEL__ */
#endif /* _LINUX_SUNRPC_GSS_API_H */