[mirror_ubuntu-bionic-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);
}

static inline __be32 *
nlm_encode_fh(__be32 *p, struct nfs_fh *f)
{
	*p++ = htonl(NFS2_FHSIZE);
	memcpy(p, f->data, 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
52921e02 AV	98	static inline __be32 *
52921e02 AV	99	nlm_encode_fh(__be32 p, struct nfs_fh f)
1da177e4 LT	100	{
	101	*p++ = htonl(NFS2_FHSIZE);
	102	memcpy(p, f->data, NFS2_FHSIZE);
	103	return p + XDR_QUADLEN(NFS2_FHSIZE);
	104	}
	105
	106	/*
	107	* Encode and decode owner handle
	108	*/
52921e02 AV	109	static inline __be32 *
52921e02 AV	110	nlm_decode_oh(__be32 p, struct xdr_netobj oh)
1da177e4 LT	111	{
	112	return xdr_decode_netobj(p, oh);
	113	}
	114
52921e02 AV	115	static inline __be32 *
52921e02 AV	116	nlm_encode_oh(__be32 p, struct xdr_netobj oh)
1da177e4 LT	117	{
	118	return xdr_encode_netobj(p, oh);
	119	}
	120
52921e02 AV	121	static __be32 *
52921e02 AV	122	nlm_decode_lock(__be32 p, struct nlm_lock lock)
1da177e4 LT	123	{
	124	struct file_lock *fl = &lock->fl;
	125	s32 start, len, end;
	126
	127	if (!(p = xdr_decode_string_inplace(p, &lock->caller,
	128	&lock->len,
	129	NLM_MAXSTRLEN))
	130	\|\| !(p = nlm_decode_fh(p, &lock->fh))
	131	\|\| !(p = nlm_decode_oh(p, &lock->oh)))
	132	return NULL;
7bab377f	133	lock->svid = ntohl(*p++);
1da177e4 LT	134
	135	locks_init_lock(fl);
	136	fl->fl_owner = current->files;
7bab377f	137	fl->fl_pid = (pid_t)lock->svid;
1da177e4 LT	138	fl->fl_flags = FL_POSIX;
	139	fl->fl_type = F_RDLCK; /* as good as anything else */
	140	start = ntohl(*p++);
	141	len = ntohl(*p++);
	142	end = start + len - 1;
	143
	144	fl->fl_start = s32_to_loff_t(start);
	145
	146	if (len == 0 \|\| end < 0)
	147	fl->fl_end = OFFSET_MAX;
	148	else
	149	fl->fl_end = s32_to_loff_t(end);
	150	return p;
	151	}
	152
1da177e4 LT	153	/*
	154	* Encode result of a TEST/TEST_MSG call
	155	*/
52921e02 AV	156	static __be32 *
52921e02 AV	157	nlm_encode_testres(__be32 p, struct nlm_res resp)
1da177e4 LT	158	{
	159	s32 start, len;
	160
	161	if (!(p = nlm_encode_cookie(p, &resp->cookie)))
	162	return NULL;
	163	*p++ = resp->status;
	164
	165	if (resp->status == nlm_lck_denied) {
	166	struct file_lock *fl = &resp->lock.fl;
	167
	168	*p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
7bab377f	169	*p++ = htonl(resp->lock.svid);
1da177e4 LT	170
	171	/* Encode owner handle. */
	172	if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
	173	return NULL;
	174
	175	start = loff_t_to_s32(fl->fl_start);
	176	if (fl->fl_end == OFFSET_MAX)
	177	len = 0;
	178	else
	179	len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
	180
	181	*p++ = htonl(start);
	182	*p++ = htonl(len);
	183	}
	184
	185	return p;
	186	}
	187
	188
	189	/*
	190	* First, the server side XDR functions
	191	*/
	192	int
52921e02	193	nlmsvc_decode_testargs(struct svc_rqst rqstp, __be32 p, nlm_args *argp)
1da177e4 LT	194	{
	195	u32 exclusive;
	196
	197	if (!(p = nlm_decode_cookie(p, &argp->cookie)))
	198	return 0;
	199
	200	exclusive = ntohl(*p++);
	201	if (!(p = nlm_decode_lock(p, &argp->lock)))
	202	return 0;
	203	if (exclusive)
	204	argp->lock.fl.fl_type = F_WRLCK;
	205
	206	return xdr_argsize_check(rqstp, p);
	207	}
	208
	209	int
52921e02	210	nlmsvc_encode_testres(struct svc_rqst rqstp, __be32 p, struct nlm_res *resp)
1da177e4 LT	211	{
	212	if (!(p = nlm_encode_testres(p, resp)))
	213	return 0;
	214	return xdr_ressize_check(rqstp, p);
	215	}
	216
	217	int
52921e02	218	nlmsvc_decode_lockargs(struct svc_rqst rqstp, __be32 p, nlm_args *argp)
1da177e4 LT	219	{
	220	u32 exclusive;
	221
	222	if (!(p = nlm_decode_cookie(p, &argp->cookie)))
	223	return 0;
	224	argp->block = ntohl(*p++);
	225	exclusive = ntohl(*p++);
	226	if (!(p = nlm_decode_lock(p, &argp->lock)))
	227	return 0;
	228	if (exclusive)
	229	argp->lock.fl.fl_type = F_WRLCK;
	230	argp->reclaim = ntohl(*p++);
	231	argp->state = ntohl(*p++);
	232	argp->monitor = 1; /* monitor client by default */
	233
	234	return xdr_argsize_check(rqstp, p);
	235	}
	236
	237	int
52921e02	238	nlmsvc_decode_cancargs(struct svc_rqst rqstp, __be32 p, nlm_args *argp)
1da177e4 LT	239	{
	240	u32 exclusive;
	241
	242	if (!(p = nlm_decode_cookie(p, &argp->cookie)))
	243	return 0;
	244	argp->block = ntohl(*p++);
	245	exclusive = ntohl(*p++);
	246	if (!(p = nlm_decode_lock(p, &argp->lock)))
	247	return 0;
	248	if (exclusive)
	249	argp->lock.fl.fl_type = F_WRLCK;
	250	return xdr_argsize_check(rqstp, p);
	251	}
	252
	253	int
52921e02	254	nlmsvc_decode_unlockargs(struct svc_rqst rqstp, __be32 p, nlm_args *argp)
1da177e4 LT	255	{
	256	if (!(p = nlm_decode_cookie(p, &argp->cookie))
	257	\|\| !(p = nlm_decode_lock(p, &argp->lock)))
	258	return 0;
	259	argp->lock.fl.fl_type = F_UNLCK;
	260	return xdr_argsize_check(rqstp, p);
	261	}
	262
	263	int
52921e02	264	nlmsvc_decode_shareargs(struct svc_rqst rqstp, __be32 p, nlm_args *argp)
1da177e4 LT	265	{
	266	struct nlm_lock *lock = &argp->lock;
	267
	268	memset(lock, 0, sizeof(*lock));
	269	locks_init_lock(&lock->fl);
7bab377f TM	270	lock->svid = ~(u32) 0;
7bab377f TM	271	lock->fl.fl_pid = (pid_t)lock->svid;
1da177e4 LT	272
	273	if (!(p = nlm_decode_cookie(p, &argp->cookie))
	274	\|\| !(p = xdr_decode_string_inplace(p, &lock->caller,
	275	&lock->len, NLM_MAXSTRLEN))
	276	\|\| !(p = nlm_decode_fh(p, &lock->fh))
	277	\|\| !(p = nlm_decode_oh(p, &lock->oh)))
	278	return 0;
	279	argp->fsm_mode = ntohl(*p++);
	280	argp->fsm_access = ntohl(*p++);
	281	return xdr_argsize_check(rqstp, p);
	282	}
	283
	284	int
52921e02	285	nlmsvc_encode_shareres(struct svc_rqst rqstp, __be32 p, struct nlm_res *resp)
1da177e4 LT	286	{
	287	if (!(p = nlm_encode_cookie(p, &resp->cookie)))
	288	return 0;
	289	*p++ = resp->status;
	290	p++ = xdr_zero; / sequence argument */
	291	return xdr_ressize_check(rqstp, p);
	292	}
	293
	294	int
52921e02	295	nlmsvc_encode_res(struct svc_rqst rqstp, __be32 p, struct nlm_res *resp)
1da177e4 LT	296	{
	297	if (!(p = nlm_encode_cookie(p, &resp->cookie)))
	298	return 0;
	299	*p++ = resp->status;
	300	return xdr_ressize_check(rqstp, p);
	301	}
	302
	303	int
52921e02	304	nlmsvc_decode_notify(struct svc_rqst rqstp, __be32 p, struct nlm_args *argp)
1da177e4 LT	305	{
	306	struct nlm_lock *lock = &argp->lock;
	307
	308	if (!(p = xdr_decode_string_inplace(p, &lock->caller,
	309	&lock->len, NLM_MAXSTRLEN)))
	310	return 0;
	311	argp->state = ntohl(*p++);
	312	return xdr_argsize_check(rqstp, p);
	313	}
	314
	315	int
52921e02	316	nlmsvc_decode_reboot(struct svc_rqst rqstp, __be32 p, struct nlm_reboot *argp)
1da177e4 LT	317	{
	318	if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
	319	return 0;
	320	argp->state = ntohl(*p++);
576df463 CL	321	memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
576df463 CL	322	p += XDR_QUADLEN(SM_PRIV_SIZE);
1da177e4 LT	323	return xdr_argsize_check(rqstp, p);
	324	}
	325
	326	int
52921e02	327	nlmsvc_decode_res(struct svc_rqst rqstp, __be32 p, struct nlm_res *resp)
1da177e4 LT	328	{
	329	if (!(p = nlm_decode_cookie(p, &resp->cookie)))
	330	return 0;
e8c5c045	331	resp->status = *p++;
1da177e4 LT	332	return xdr_argsize_check(rqstp, p);
	333	}
	334
	335	int
52921e02	336	nlmsvc_decode_void(struct svc_rqst rqstp, __be32 p, void *dummy)
1da177e4 LT	337	{
	338	return xdr_argsize_check(rqstp, p);
	339	}
	340
	341	int
52921e02	342	nlmsvc_encode_void(struct svc_rqst rqstp, __be32 p, void *dummy)
1da177e4 LT	343	{
	344	return xdr_ressize_check(rqstp, p);
	345	}