/* SPDX-License-Identifier: GPL-2.0 */
/*
 * linux/include/linux/sunrpc/auth_gss.h
 *
 * Declarations for RPCSEC_GSS
 *
 * 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_AUTH_GSS_H
#define _LINUX_SUNRPC_AUTH_GSS_H

#include <linux/refcount.h>
#include <linux/sunrpc/auth.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/gss_api.h>

#define RPC_GSS_VERSION		1

#define MAXSEQ 0x80000000 /* maximum legal sequence number, from rfc 2203 */

enum rpc_gss_proc {
	RPC_GSS_PROC_DATA = 0,
	RPC_GSS_PROC_INIT = 1,
	RPC_GSS_PROC_CONTINUE_INIT = 2,
	RPC_GSS_PROC_DESTROY = 3
};

enum rpc_gss_svc {
	RPC_GSS_SVC_NONE = 1,
	RPC_GSS_SVC_INTEGRITY = 2,
	RPC_GSS_SVC_PRIVACY = 3
};

/* on-the-wire gss cred: */
struct rpc_gss_wire_cred {
	u32			gc_v;		/* version */
	u32			gc_proc;	/* control procedure */
	u32			gc_seq;		/* sequence number */
	u32			gc_svc;		/* service */
	struct xdr_netobj	gc_ctx;		/* context handle */
};

/* on-the-wire gss verifier: */
struct rpc_gss_wire_verf {
	u32			gv_flavor;
	struct xdr_netobj	gv_verf;
};

/* return from gss NULL PROC init sec context */
struct rpc_gss_init_res {
	struct xdr_netobj	gr_ctx;		/* context handle */
	u32			gr_major;	/* major status */
	u32			gr_minor;	/* minor status */
	u32			gr_win;		/* sequence window */
	struct xdr_netobj	gr_token;	/* token */
};

/* The gss_cl_ctx struct holds all the information the rpcsec_gss client
 * code needs to know about a single security context.  In particular,
 * gc_gss_ctx is the context handle that is used to do gss-api calls, while
 * gc_wire_ctx is the context handle that is used to identify the context on
 * the wire when communicating with a server. */

struct gss_cl_ctx {
	refcount_t		count;
	enum rpc_gss_proc	gc_proc;
	u32			gc_seq;
	u32			gc_seq_xmit;
	spinlock_t		gc_seq_lock;
	struct gss_ctx		*gc_gss_ctx;
	struct xdr_netobj	gc_wire_ctx;
	struct xdr_netobj	gc_acceptor;
	u32			gc_win;
	unsigned long		gc_expiry;
	struct rcu_head		gc_rcu;
};

struct gss_upcall_msg;
struct gss_cred {
	struct rpc_cred		gc_base;
	enum rpc_gss_svc	gc_service;
	struct gss_cl_ctx __rcu	*gc_ctx;
	struct gss_upcall_msg	*gc_upcall;
	const char		*gc_principal;
	unsigned long		gc_upcall_timestamp;
};

#endif /* _LINUX_SUNRPC_AUTH_GSS_H */