linux/fs/lockd/clnt4xdr.c

// SPDX-License-Identifier: GPL-2.0
/*
 * linux/fs/lockd/clnt4xdr.c
 *
 * XDR functions to encode/decode NLM version 4 RPC arguments and results.
 *
 * NLM client-side only.
 *
 * Copyright (C) 2010, Oracle.  All rights reserved.
 */

#include <linux/types.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/stats.h>
#include <linux/lockd/lockd.h>

#include <uapi/linux/nfs3.h>

#define NLMDBG_FACILITY …

#if (NLMCLNT_OHSIZE > XDR_MAX_NETOBJ)
#  error "NLM host name cannot be larger than XDR_MAX_NETOBJ!"
#endif

#if (NLMCLNT_OHSIZE > NLM_MAXSTRLEN)
#  error "NLM host name cannot be larger than NLM's maximum string length!"
#endif

/*
 * Declare the space requirements for NLM arguments and replies as
 * number of 32bit-words
 */
#define NLM4_void_sz …
#define NLM4_cookie_sz …
#define NLM4_caller_sz …
#define NLM4_owner_sz …
#define NLM4_fhandle_sz …
#define NLM4_lock_sz …
#define NLM4_holder_sz …

#define NLM4_testargs_sz …
#define NLM4_lockargs_sz …
#define NLM4_cancargs_sz …
#define NLM4_unlockargs_sz …

#define NLM4_testres_sz …
#define NLM4_res_sz …
#define NLM4_norep_sz …


static s64 loff_t_to_s64(loff_t offset)
{ … }

static void nlm4_compute_offsets(const struct nlm_lock *lock,
				 u64 *l_offset, u64 *l_len)
{ … }

/*
 * Encode/decode NLMv4 basic data types
 *
 * Basic NLMv4 data types are defined in Appendix II, section 6.1.4
 * of RFC 1813: "NFS Version 3 Protocol Specification" and in Chapter
 * 10 of X/Open's "Protocols for Interworking: XNFS, Version 3W".
 *
 * Not all basic data types have their own encoding and decoding
 * functions.  For run-time efficiency, some data types are encoded
 * or decoded inline.
 */

static void encode_bool(struct xdr_stream *xdr, const int value)
{ … }

static void encode_int32(struct xdr_stream *xdr, const s32 value)
{ … }

/*
 *	typedef opaque netobj<MAXNETOBJ_SZ>
 */
static void encode_netobj(struct xdr_stream *xdr,
			  const u8 *data, const unsigned int length)
{ … }

static int decode_netobj(struct xdr_stream *xdr,
			 struct xdr_netobj *obj)
{ … }

/*
 *	netobj cookie;
 */
static void encode_cookie(struct xdr_stream *xdr,
			  const struct nlm_cookie *cookie)
{ … }

static int decode_cookie(struct xdr_stream *xdr,
			     struct nlm_cookie *cookie)
{ … }

/*
 *	netobj fh;
 */
static void encode_fh(struct xdr_stream *xdr, const struct nfs_fh *fh)
{ … }

/*
 *	enum nlm4_stats {
 *		NLM4_GRANTED = 0,
 *		NLM4_DENIED = 1,
 *		NLM4_DENIED_NOLOCKS = 2,
 *		NLM4_BLOCKED = 3,
 *		NLM4_DENIED_GRACE_PERIOD = 4,
 *		NLM4_DEADLCK = 5,
 *		NLM4_ROFS = 6,
 *		NLM4_STALE_FH = 7,
 *		NLM4_FBIG = 8,
 *		NLM4_FAILED = 9
 *	};
 *
 *	struct nlm4_stat {
 *		nlm4_stats stat;
 *	};
 *
 * NB: we don't swap bytes for the NLM status values.  The upper
 * layers deal directly with the status value in network byte
 * order.
 */
static void encode_nlm4_stat(struct xdr_stream *xdr,
			     const __be32 stat)
{ … }

static int decode_nlm4_stat(struct xdr_stream *xdr, __be32 *stat)
{ … }

/*
 *	struct nlm4_holder {
 *		bool	exclusive;
 *		int32	svid;
 *		netobj	oh;
 *		uint64	l_offset;
 *		uint64	l_len;
 *	};
 */
static void encode_nlm4_holder(struct xdr_stream *xdr,
			       const struct nlm_res *result)
{ … }

static int decode_nlm4_holder(struct xdr_stream *xdr, struct nlm_res *result)
{ … }

/*
 *	string caller_name<LM_MAXSTRLEN>;
 */
static void encode_caller_name(struct xdr_stream *xdr, const char *name)
{ … }

/*
 *	struct nlm4_lock {
 *		string	caller_name<LM_MAXSTRLEN>;
 *		netobj	fh;
 *		netobj	oh;
 *		int32	svid;
 *		uint64	l_offset;
 *		uint64	l_len;
 *	};
 */
static void encode_nlm4_lock(struct xdr_stream *xdr,
			     const struct nlm_lock *lock)
{ … }


/*
 * NLMv4 XDR encode functions
 *
 * NLMv4 argument types are defined in Appendix II of RFC 1813:
 * "NFS Version 3 Protocol Specification" and Chapter 10 of X/Open's
 * "Protocols for Interworking: XNFS, Version 3W".
 */

/*
 *	struct nlm4_testargs {
 *		netobj cookie;
 *		bool exclusive;
 *		struct nlm4_lock alock;
 *	};
 */
static void nlm4_xdr_enc_testargs(struct rpc_rqst *req,
				  struct xdr_stream *xdr,
				  const void *data)
{ … }

/*
 *	struct nlm4_lockargs {
 *		netobj cookie;
 *		bool block;
 *		bool exclusive;
 *		struct nlm4_lock alock;
 *		bool reclaim;
 *		int state;
 *	};
 */
static void nlm4_xdr_enc_lockargs(struct rpc_rqst *req,
				  struct xdr_stream *xdr,
				  const void *data)
{ … }

/*
 *	struct nlm4_cancargs {
 *		netobj cookie;
 *		bool block;
 *		bool exclusive;
 *		struct nlm4_lock alock;
 *	};
 */
static void nlm4_xdr_enc_cancargs(struct rpc_rqst *req,
				  struct xdr_stream *xdr,
				  const void *data)
{ … }

/*
 *	struct nlm4_unlockargs {
 *		netobj cookie;
 *		struct nlm4_lock alock;
 *	};
 */
static void nlm4_xdr_enc_unlockargs(struct rpc_rqst *req,
				    struct xdr_stream *xdr,
				    const void *data)
{ … }

/*
 *	struct nlm4_res {
 *		netobj cookie;
 *		nlm4_stat stat;
 *	};
 */
static void nlm4_xdr_enc_res(struct rpc_rqst *req,
			     struct xdr_stream *xdr,
			     const void *data)
{ … }

/*
 *	union nlm4_testrply switch (nlm4_stats stat) {
 *	case NLM4_DENIED:
 *		struct nlm4_holder holder;
 *	default:
 *		void;
 *	};
 *
 *	struct nlm4_testres {
 *		netobj cookie;
 *		nlm4_testrply test_stat;
 *	};
 */
static void nlm4_xdr_enc_testres(struct rpc_rqst *req,
				 struct xdr_stream *xdr,
				 const void *data)
{ … }


/*
 * NLMv4 XDR decode functions
 *
 * NLMv4 argument types are defined in Appendix II of RFC 1813:
 * "NFS Version 3 Protocol Specification" and Chapter 10 of X/Open's
 * "Protocols for Interworking: XNFS, Version 3W".
 */

/*
 *	union nlm4_testrply switch (nlm4_stats stat) {
 *	case NLM4_DENIED:
 *		struct nlm4_holder holder;
 *	default:
 *		void;
 *	};
 *
 *	struct nlm4_testres {
 *		netobj cookie;
 *		nlm4_testrply test_stat;
 *	};
 */
static int decode_nlm4_testrply(struct xdr_stream *xdr,
				struct nlm_res *result)
{ … }

static int nlm4_xdr_dec_testres(struct rpc_rqst *req,
				struct xdr_stream *xdr,
				void *data)
{ … }

/*
 *	struct nlm4_res {
 *		netobj cookie;
 *		nlm4_stat stat;
 *	};
 */
static int nlm4_xdr_dec_res(struct rpc_rqst *req,
			    struct xdr_stream *xdr,
			    void *data)
{ … }


/*
 * For NLM, a void procedure really returns nothing
 */
#define nlm4_xdr_dec_norep …

#define PROC(proc, argtype, restype) …

static const struct rpc_procinfo nlm4_procedures[] = …;

static unsigned int nlm_version4_counts[ARRAY_SIZE(nlm4_procedures)];
const struct rpc_version nlm_version4 = …;