[mirror_ubuntu-zesty-kernel.git] / fs / lockd / xdr.c

/*
 * linux/fs/lockd/xdr.c
 *
 * XDR support for lockd and the lock client.
 *
 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/types.h>
#include <linux/sched.h>
#include <linux/nfs.h>

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

#include <uapi/linux/nfs2.h>

#define NLMDBG_FACILITY		NLMDBG_XDR


static inline loff_t
s32_to_loff_t(__s32 offset)
{
	return (loff_t)offset;
}

static inline __s32
loff_t_to_s32(loff_t offset)
{
	__s32 res;
	if (offset >= NLM_OFFSET_MAX)
		res = NLM_OFFSET_MAX;
	else if (offset <= -NLM_OFFSET_MAX)
		res = -NLM_OFFSET_MAX;
	else
		res = offset;
	return res;
}

/*
 * XDR functions for basic NLM types
 */
static __be32 *nlm_decode_cookie(__be32 *p, struct nlm_cookie *c)
{
	unsigned int	len;

	len = ntohl(*p++);
	
	if(len==0)
	{
		c->len=4;
		memset(c->data, 0, 4);	/* hockeypux brain damage */
	}
	else if(len<=NLM_MAXCOOKIELEN)
	{
		c->len=len;
		memcpy(c->data, p, len);
		p+=XDR_QUADLEN(len);
	}
	else 
	{
		dprintk("lockd: bad cookie size %d (only cookies under "
			"%d bytes are supported.)\n",
				len, NLM_MAXCOOKIELEN);
		return NULL;
	}
	return p;
}

static inline __be32 *
nlm_encode_cookie(__be32 *p, struct nlm_cookie *c)
{
	*p++ = htonl(c->len);
	memcpy(p, c->data, c->len);
	p+=XDR_QUADLEN(c->len);
	return p;
}

static __be32 *
nlm_decode_fh(__be32 *p, struct nfs_fh *f)
{
	unsigned int	len;

	if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
		dprintk("lockd: bad fhandle size %d (should be %d)\n",
			len, NFS2_FHSIZE);
		return NULL;
	}
	f->size = NFS2_FHSIZE;
	memset(f->data, 0, sizeof(f->data));
	memcpy(f->data, p, NFS2_FHSIZE);
	return p + XDR_QUADLEN(NFS2_FHSIZE);
}

/*
 * Encode and decode owner handle
 */
static inline __be32 *
nlm_decode_oh(__be32 *p, struct xdr_netobj *oh)
{
	return xdr_decode_netobj(p, oh);
}

static inline __be32 *
nlm_encode_oh(__be32 *p, struct xdr_netobj *oh)
{
	return xdr_encode_netobj(p, oh);
}

static __be32 *
nlm_decode_lock(__be32 *p, struct nlm_lock *lock)
{
	struct file_lock	*fl = &lock->fl;
	s32			start, len, end;

	if (!(p = xdr_decode_string_inplace(p, &lock->caller,
					    &lock->len,
					    NLM_MAXSTRLEN))
	 || !(p = nlm_decode_fh(p, &lock->fh))
	 || !(p = nlm_decode_oh(p, &lock->oh)))
		return NULL;
	lock->svid  = ntohl(*p++);

	locks_init_lock(fl);
	fl->fl_owner = current->files;
	fl->fl_pid   = (pid_t)lock->svid;
	fl->fl_flags = FL_POSIX;
	fl->fl_type  = F_RDLCK;		/* as good as anything else */
	start = ntohl(*p++);
	len = ntohl(*p++);
	end = start + len - 1;

	fl->fl_start = s32_to_loff_t(start);

	if (len == 0 || end < 0)
		fl->fl_end = OFFSET_MAX;
	else
		fl->fl_end = s32_to_loff_t(end);
	return p;
}

/*
 * Encode result of a TEST/TEST_MSG call
 */
static __be32 *
nlm_encode_testres(__be32 *p, struct nlm_res *resp)
{
	s32		start, len;

	if (!(p = nlm_encode_cookie(p, &resp->cookie)))
		return NULL;
	*p++ = resp->status;

	if (resp->status == nlm_lck_denied) {
		struct file_lock	*fl = &resp->lock.fl;

		*p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
		*p++ = htonl(resp->lock.svid);

		/* Encode owner handle. */
		if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
			return NULL;

		start = loff_t_to_s32(fl->fl_start);
		if (fl->fl_end == OFFSET_MAX)
			len = 0;
		else
			len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);

		*p++ = htonl(start);
		*p++ = htonl(len);
	}

	return p;
}


/*
 * First, the server side XDR functions
 */
int
nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
	u32	exclusive;

	if (!(p = nlm_decode_cookie(p, &argp->cookie)))
		return 0;

	exclusive = ntohl(*p++);
	if (!(p = nlm_decode_lock(p, &argp->lock)))
		return 0;
	if (exclusive)
		argp->lock.fl.fl_type = F_WRLCK;

	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
{
	if (!(p = nlm_encode_testres(p, resp)))
		return 0;
	return xdr_ressize_check(rqstp, p);
}

int
nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
	u32	exclusive;

	if (!(p = nlm_decode_cookie(p, &argp->cookie)))
		return 0;
	argp->block  = ntohl(*p++);
	exclusive    = ntohl(*p++);
	if (!(p = nlm_decode_lock(p, &argp->lock)))
		return 0;
	if (exclusive)
		argp->lock.fl.fl_type = F_WRLCK;
	argp->reclaim = ntohl(*p++);
	argp->state   = ntohl(*p++);
	argp->monitor = 1;		/* monitor client by default */

	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
	u32	exclusive;

	if (!(p = nlm_decode_cookie(p, &argp->cookie)))
		return 0;
	argp->block = ntohl(*p++);
	exclusive = ntohl(*p++);
	if (!(p = nlm_decode_lock(p, &argp->lock)))
		return 0;
	if (exclusive)
		argp->lock.fl.fl_type = F_WRLCK;
	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
	if (!(p = nlm_decode_cookie(p, &argp->cookie))
	 || !(p = nlm_decode_lock(p, &argp->lock)))
		return 0;
	argp->lock.fl.fl_type = F_UNLCK;
	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
	struct nlm_lock	*lock = &argp->lock;

	memset(lock, 0, sizeof(*lock));
	locks_init_lock(&lock->fl);
	lock->svid = ~(u32) 0;
	lock->fl.fl_pid = (pid_t)lock->svid;

	if (!(p = nlm_decode_cookie(p, &argp->cookie))
	 || !(p = xdr_decode_string_inplace(p, &lock->caller,
					    &lock->len, NLM_MAXSTRLEN))
	 || !(p = nlm_decode_fh(p, &lock->fh))
	 || !(p = nlm_decode_oh(p, &lock->oh)))
		return 0;
	argp->fsm_mode = ntohl(*p++);
	argp->fsm_access = ntohl(*p++);
	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
{
	if (!(p = nlm_encode_cookie(p, &resp->cookie)))
		return 0;
	*p++ = resp->status;
	*p++ = xdr_zero;		/* sequence argument */
	return xdr_ressize_check(rqstp, p);
}

int
nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
{
	if (!(p = nlm_encode_cookie(p, &resp->cookie)))
		return 0;
	*p++ = resp->status;
	return xdr_ressize_check(rqstp, p);
}

int
nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp)
{
	struct nlm_lock	*lock = &argp->lock;

	if (!(p = xdr_decode_string_inplace(p, &lock->caller,
					    &lock->len, NLM_MAXSTRLEN)))
		return 0;
	argp->state = ntohl(*p++);
	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp)
{
	if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
		return 0;
	argp->state = ntohl(*p++);
	memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
	p += XDR_QUADLEN(SM_PRIV_SIZE);
	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
{
	if (!(p = nlm_decode_cookie(p, &resp->cookie)))
		return 0;
	resp->status = *p++;
	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
	return xdr_ressize_check(rqstp, p);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/lockd/xdr.c
	3	*
	4	* XDR support for lockd and the lock client.
	5	*
	6	* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
	7	*/
	8
1da177e4 LT	9	#include <linux/types.h>
1da177e4 LT	10	#include <linux/sched.h>
1da177e4 LT	11	#include <linux/nfs.h>
	12
	13	#include <linux/sunrpc/xdr.h>
	14	#include <linux/sunrpc/clnt.h>
	15	#include <linux/sunrpc/svc.h>
	16	#include <linux/sunrpc/stats.h>
	17	#include <linux/lockd/lockd.h>
1da177e4	18
9c69de4c CH	19	#include <uapi/linux/nfs2.h>
9c69de4c CH	20
1da177e4 LT	21	#define NLMDBG_FACILITY NLMDBG_XDR
	22
	23
	24	static inline loff_t
	25	s32_to_loff_t(__s32 offset)
	26	{
	27	return (loff_t)offset;
	28	}
	29
	30	static inline __s32
	31	loff_t_to_s32(loff_t offset)
	32	{
	33	__s32 res;
	34	if (offset >= NLM_OFFSET_MAX)
	35	res = NLM_OFFSET_MAX;
	36	else if (offset <= -NLM_OFFSET_MAX)
	37	res = -NLM_OFFSET_MAX;
	38	else
	39	res = offset;
	40	return res;
	41	}
	42
	43	/*
	44	* XDR functions for basic NLM types
	45	*/
52921e02	46	static __be32 nlm_decode_cookie(__be32 p, struct nlm_cookie *c)
1da177e4 LT	47	{
	48	unsigned int len;
	49
	50	len = ntohl(*p++);
	51
	52	if(len==0)
	53	{
	54	c->len=4;
	55	memset(c->data, 0, 4); /* hockeypux brain damage */
	56	}
	57	else if(len<=NLM_MAXCOOKIELEN)
	58	{
	59	c->len=len;
	60	memcpy(c->data, p, len);
	61	p+=XDR_QUADLEN(len);
	62	}
	63	else
	64	{
e159a08b CL	65	dprintk("lockd: bad cookie size %d (only cookies under "
	66	"%d bytes are supported.)\n",
	67	len, NLM_MAXCOOKIELEN);
1da177e4 LT	68	return NULL;
	69	}
	70	return p;
	71	}
	72
52921e02 AV	73	static inline __be32 *
52921e02 AV	74	nlm_encode_cookie(__be32 p, struct nlm_cookie c)
1da177e4 LT	75	{
	76	*p++ = htonl(c->len);
	77	memcpy(p, c->data, c->len);
	78	p+=XDR_QUADLEN(c->len);
	79	return p;
	80	}
	81
52921e02 AV	82	static __be32 *
52921e02 AV	83	nlm_decode_fh(__be32 p, struct nfs_fh f)
1da177e4 LT	84	{
	85	unsigned int len;
	86
	87	if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
e159a08b	88	dprintk("lockd: bad fhandle size %d (should be %d)\n",
1da177e4 LT	89	len, NFS2_FHSIZE);
	90	return NULL;
	91	}
	92	f->size = NFS2_FHSIZE;
	93	memset(f->data, 0, sizeof(f->data));
	94	memcpy(f->data, p, NFS2_FHSIZE);
	95	return p + XDR_QUADLEN(NFS2_FHSIZE);
	96	}
	97
1da177e4 LT	98	/*
	99	* Encode and decode owner handle
	100	*/
52921e02 AV	101	static inline __be32 *
52921e02 AV	102	nlm_decode_oh(__be32 p, struct xdr_netobj oh)
1da177e4 LT	103	{
	104	return xdr_decode_netobj(p, oh);
	105	}
	106
52921e02 AV	107	static inline __be32 *
52921e02 AV	108	nlm_encode_oh(__be32 p, struct xdr_netobj oh)
1da177e4 LT	109	{
	110	return xdr_encode_netobj(p, oh);
	111	}
	112
52921e02 AV	113	static __be32 *
52921e02 AV	114	nlm_decode_lock(__be32 p, struct nlm_lock lock)
1da177e4 LT	115	{
	116	struct file_lock *fl = &lock->fl;
	117	s32 start, len, end;
	118
	119	if (!(p = xdr_decode_string_inplace(p, &lock->caller,
	120	&lock->len,
	121	NLM_MAXSTRLEN))
	122	\|\| !(p = nlm_decode_fh(p, &lock->fh))
	123	\|\| !(p = nlm_decode_oh(p, &lock->oh)))
	124	return NULL;
7bab377f	125	lock->svid = ntohl(*p++);
1da177e4 LT	126
	127	locks_init_lock(fl);
	128	fl->fl_owner = current->files;
7bab377f	129	fl->fl_pid = (pid_t)lock->svid;
1da177e4 LT	130	fl->fl_flags = FL_POSIX;
	131	fl->fl_type = F_RDLCK; /* as good as anything else */
	132	start = ntohl(*p++);
	133	len = ntohl(*p++);
	134	end = start + len - 1;
	135
	136	fl->fl_start = s32_to_loff_t(start);
	137
	138	if (len == 0 \|\| end < 0)
	139	fl->fl_end = OFFSET_MAX;
	140	else
	141	fl->fl_end = s32_to_loff_t(end);
	142	return p;
	143	}
	144
1da177e4 LT	145	/*
	146	* Encode result of a TEST/TEST_MSG call
	147	*/
52921e02 AV	148	static __be32 *
52921e02 AV	149	nlm_encode_testres(__be32 p, struct nlm_res resp)
1da177e4 LT	150	{
	151	s32 start, len;
	152
	153	if (!(p = nlm_encode_cookie(p, &resp->cookie)))
	154	return NULL;
	155	*p++ = resp->status;
	156
	157	if (resp->status == nlm_lck_denied) {
	158	struct file_lock *fl = &resp->lock.fl;
	159
	160	*p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
7bab377f	161	*p++ = htonl(resp->lock.svid);
1da177e4 LT	162
	163	/* Encode owner handle. */
	164	if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
	165	return NULL;
	166
	167	start = loff_t_to_s32(fl->fl_start);
	168	if (fl->fl_end == OFFSET_MAX)
	169	len = 0;
	170	else
	171	len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
	172
	173	*p++ = htonl(start);
	174	*p++ = htonl(len);
	175	}
	176
	177	return p;
	178	}
	179
	180
	181	/*
	182	* First, the server side XDR functions
	183	*/
	184	int
52921e02	185	nlmsvc_decode_testargs(struct svc_rqst rqstp, __be32 p, nlm_args *argp)
1da177e4 LT	186	{
	187	u32 exclusive;
	188
	189	if (!(p = nlm_decode_cookie(p, &argp->cookie)))
	190	return 0;
	191
	192	exclusive = ntohl(*p++);
	193	if (!(p = nlm_decode_lock(p, &argp->lock)))
	194	return 0;
	195	if (exclusive)
	196	argp->lock.fl.fl_type = F_WRLCK;
	197
	198	return xdr_argsize_check(rqstp, p);
	199	}
	200
	201	int
52921e02	202	nlmsvc_encode_testres(struct svc_rqst rqstp, __be32 p, struct nlm_res *resp)
1da177e4 LT	203	{
	204	if (!(p = nlm_encode_testres(p, resp)))
	205	return 0;
	206	return xdr_ressize_check(rqstp, p);
	207	}
	208
	209	int
52921e02	210	nlmsvc_decode_lockargs(struct svc_rqst rqstp, __be32 p, nlm_args *argp)
1da177e4 LT	211	{
	212	u32 exclusive;
	213
	214	if (!(p = nlm_decode_cookie(p, &argp->cookie)))
	215	return 0;
	216	argp->block = ntohl(*p++);
	217	exclusive = ntohl(*p++);
	218	if (!(p = nlm_decode_lock(p, &argp->lock)))
	219	return 0;
	220	if (exclusive)
	221	argp->lock.fl.fl_type = F_WRLCK;
	222	argp->reclaim = ntohl(*p++);
	223	argp->state = ntohl(*p++);
	224	argp->monitor = 1; /* monitor client by default */
	225
	226	return xdr_argsize_check(rqstp, p);
	227	}
	228
	229	int
52921e02	230	nlmsvc_decode_cancargs(struct svc_rqst rqstp, __be32 p, nlm_args *argp)
1da177e4 LT	231	{
	232	u32 exclusive;
	233
	234	if (!(p = nlm_decode_cookie(p, &argp->cookie)))
	235	return 0;
	236	argp->block = ntohl(*p++);
	237	exclusive = ntohl(*p++);
	238	if (!(p = nlm_decode_lock(p, &argp->lock)))
	239	return 0;
	240	if (exclusive)
	241	argp->lock.fl.fl_type = F_WRLCK;
	242	return xdr_argsize_check(rqstp, p);
	243	}
	244
	245	int
52921e02	246	nlmsvc_decode_unlockargs(struct svc_rqst rqstp, __be32 p, nlm_args *argp)
1da177e4 LT	247	{
	248	if (!(p = nlm_decode_cookie(p, &argp->cookie))
	249	\|\| !(p = nlm_decode_lock(p, &argp->lock)))
	250	return 0;
	251	argp->lock.fl.fl_type = F_UNLCK;
	252	return xdr_argsize_check(rqstp, p);
	253	}
	254
	255	int
52921e02	256	nlmsvc_decode_shareargs(struct svc_rqst rqstp, __be32 p, nlm_args *argp)
1da177e4 LT	257	{
	258	struct nlm_lock *lock = &argp->lock;
	259
	260	memset(lock, 0, sizeof(*lock));
	261	locks_init_lock(&lock->fl);
7bab377f TM	262	lock->svid = ~(u32) 0;
7bab377f TM	263	lock->fl.fl_pid = (pid_t)lock->svid;
1da177e4 LT	264
	265	if (!(p = nlm_decode_cookie(p, &argp->cookie))
	266	\|\| !(p = xdr_decode_string_inplace(p, &lock->caller,
	267	&lock->len, NLM_MAXSTRLEN))
	268	\|\| !(p = nlm_decode_fh(p, &lock->fh))
	269	\|\| !(p = nlm_decode_oh(p, &lock->oh)))
	270	return 0;
	271	argp->fsm_mode = ntohl(*p++);
	272	argp->fsm_access = ntohl(*p++);
	273	return xdr_argsize_check(rqstp, p);
	274	}
	275
	276	int
52921e02	277	nlmsvc_encode_shareres(struct svc_rqst rqstp, __be32 p, struct nlm_res *resp)
1da177e4 LT	278	{
	279	if (!(p = nlm_encode_cookie(p, &resp->cookie)))
	280	return 0;
	281	*p++ = resp->status;
	282	p++ = xdr_zero; / sequence argument */
	283	return xdr_ressize_check(rqstp, p);
	284	}
	285
	286	int
52921e02	287	nlmsvc_encode_res(struct svc_rqst rqstp, __be32 p, struct nlm_res *resp)
1da177e4 LT	288	{
	289	if (!(p = nlm_encode_cookie(p, &resp->cookie)))
	290	return 0;
	291	*p++ = resp->status;
	292	return xdr_ressize_check(rqstp, p);
	293	}
	294
	295	int
52921e02	296	nlmsvc_decode_notify(struct svc_rqst rqstp, __be32 p, struct nlm_args *argp)
1da177e4 LT	297	{
	298	struct nlm_lock *lock = &argp->lock;
	299
	300	if (!(p = xdr_decode_string_inplace(p, &lock->caller,
	301	&lock->len, NLM_MAXSTRLEN)))
	302	return 0;
	303	argp->state = ntohl(*p++);
	304	return xdr_argsize_check(rqstp, p);
	305	}
	306
	307	int
52921e02	308	nlmsvc_decode_reboot(struct svc_rqst rqstp, __be32 p, struct nlm_reboot *argp)
1da177e4 LT	309	{
	310	if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
	311	return 0;
	312	argp->state = ntohl(*p++);
576df463 CL	313	memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
576df463 CL	314	p += XDR_QUADLEN(SM_PRIV_SIZE);
1da177e4 LT	315	return xdr_argsize_check(rqstp, p);
	316	}
	317
	318	int
52921e02	319	nlmsvc_decode_res(struct svc_rqst rqstp, __be32 p, struct nlm_res *resp)
1da177e4 LT	320	{
	321	if (!(p = nlm_decode_cookie(p, &resp->cookie)))
	322	return 0;
e8c5c045	323	resp->status = *p++;
1da177e4 LT	324	return xdr_argsize_check(rqstp, p);
	325	}
	326
	327	int
52921e02	328	nlmsvc_decode_void(struct svc_rqst rqstp, __be32 p, void *dummy)
1da177e4 LT	329	{
	330	return xdr_argsize_check(rqstp, p);
	331	}
	332
	333	int
52921e02	334	nlmsvc_encode_void(struct svc_rqst rqstp, __be32 p, void *dummy)
1da177e4 LT	335	{
	336	return xdr_ressize_check(rqstp, p);
	337	}