[net-next-2.6.git] / fs / nfsd / nfs3acl.c

/*
 * linux/fs/nfsd/nfs3acl.c
 *
 * Process version 3 NFSACL requests.
 *
 * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
 */

#include <linux/sunrpc/svc.h>
#include <linux/nfs3.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
#include <linux/nfsd/xdr3.h>
#include <linux/posix_acl.h>
#include <linux/nfsacl.h>

#define RETURN_STATUS(st)	{ resp->status = (st); return (st); }

/*
 * NULL call.
 */
static __be32
nfsd3_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
	return nfs_ok;
}

/*
 * Get the Access and/or Default ACL of a file.
 */
static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp,
		struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
{
	svc_fh *fh;
	struct posix_acl *acl;
	__be32 nfserr = 0;

	fh = fh_copy(&resp->fh, &argp->fh);
	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
	if (nfserr)
		RETURN_STATUS(nfserr);

	if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
		RETURN_STATUS(nfserr_inval);
	resp->mask = argp->mask;

	if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
		acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
		if (IS_ERR(acl)) {
			int err = PTR_ERR(acl);

			if (err == -ENODATA || err == -EOPNOTSUPP)
				acl = NULL;
			else {
				nfserr = nfserrno(err);
				goto fail;
			}
		}
		if (acl == NULL) {
			/* Solaris returns the inode's minimum ACL. */

			struct inode *inode = fh->fh_dentry->d_inode;
			acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
		}
		resp->acl_access = acl;
	}
	if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
		/* Check how Solaris handles requests for the Default ACL
		   of a non-directory! */

		acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
		if (IS_ERR(acl)) {
			int err = PTR_ERR(acl);

			if (err == -ENODATA || err == -EOPNOTSUPP)
				acl = NULL;
			else {
				nfserr = nfserrno(err);
				goto fail;
			}
		}
		resp->acl_default = acl;
	}

	/* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
	RETURN_STATUS(0);

fail:
	posix_acl_release(resp->acl_access);
	posix_acl_release(resp->acl_default);
	RETURN_STATUS(nfserr);
}

/*
 * Set the Access and/or Default ACL of a file.
 */
static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp,
		struct nfsd3_setaclargs *argp,
		struct nfsd3_attrstat *resp)
{
	svc_fh *fh;
	__be32 nfserr = 0;

	fh = fh_copy(&resp->fh, &argp->fh);
	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);

	if (!nfserr) {
		nfserr = nfserrno( nfsd_set_posix_acl(
			fh, ACL_TYPE_ACCESS, argp->acl_access) );
	}
	if (!nfserr) {
		nfserr = nfserrno( nfsd_set_posix_acl(
			fh, ACL_TYPE_DEFAULT, argp->acl_default) );
	}

	/* argp->acl_{access,default} may have been allocated in
	   nfs3svc_decode_setaclargs. */
	posix_acl_release(argp->acl_access);
	posix_acl_release(argp->acl_default);
	RETURN_STATUS(nfserr);
}

/*
 * XDR decode functions
 */
static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd3_getaclargs *args)
{
	if (!(p = nfs3svc_decode_fh(p, &args->fh)))
		return 0;
	args->mask = ntohl(*p); p++;

	return xdr_argsize_check(rqstp, p);
}


static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd3_setaclargs *args)
{
	struct kvec *head = rqstp->rq_arg.head;
	unsigned int base;
	int n;

	if (!(p = nfs3svc_decode_fh(p, &args->fh)))
		return 0;
	args->mask = ntohl(*p++);
	if (args->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
	    !xdr_argsize_check(rqstp, p))
		return 0;

	base = (char *)p - (char *)head->iov_base;
	n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
			  (args->mask & NFS_ACL) ?
			  &args->acl_access : NULL);
	if (n > 0)
		n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
				  (args->mask & NFS_DFACL) ?
				  &args->acl_default : NULL);
	return (n > 0);
}

/*
 * XDR encode functions
 */

/* GETACL */
static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd3_getaclres *resp)
{
	struct dentry *dentry = resp->fh.fh_dentry;

	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
	if (resp->status == 0 && dentry && dentry->d_inode) {
		struct inode *inode = dentry->d_inode;
		struct kvec *head = rqstp->rq_res.head;
		unsigned int base;
		int n;
		int w;

		*p++ = htonl(resp->mask);
		if (!xdr_ressize_check(rqstp, p))
			return 0;
		base = (char *)p - (char *)head->iov_base;

		rqstp->rq_res.page_len = w = nfsacl_size(
			(resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
			(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
		while (w > 0) {
			if (!rqstp->rq_respages[rqstp->rq_resused++])
				return 0;
			w -= PAGE_SIZE;
		}

		n = nfsacl_encode(&rqstp->rq_res, base, inode,
				  resp->acl_access,
				  resp->mask & NFS_ACL, 0);
		if (n > 0)
			n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
					  resp->acl_default,
					  resp->mask & NFS_DFACL,
					  NFS_ACL_DEFAULT);
		if (n <= 0)
			return 0;
	} else
		if (!xdr_ressize_check(rqstp, p))
			return 0;

	return 1;
}

/* SETACL */
static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd3_attrstat *resp)
{
	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);

	return xdr_ressize_check(rqstp, p);
}

/*
 * XDR release functions
 */
static int nfs3svc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
		struct nfsd3_getaclres *resp)
{
	fh_put(&resp->fh);
	posix_acl_release(resp->acl_access);
	posix_acl_release(resp->acl_default);
	return 1;
}

#define nfs3svc_decode_voidargs		NULL
#define nfs3svc_release_void		NULL
#define nfsd3_setaclres			nfsd3_attrstat
#define nfsd3_voidres			nfsd3_voidargs
struct nfsd3_voidargs { int dummy; };

#define PROC(name, argt, rest, relt, cache, respsize)	\
 { (svc_procfunc) nfsd3_proc_##name,		\
   (kxdrproc_t) nfs3svc_decode_##argt##args,	\
   (kxdrproc_t) nfs3svc_encode_##rest##res,	\
   (kxdrproc_t) nfs3svc_release_##relt,		\
   sizeof(struct nfsd3_##argt##args),		\
   sizeof(struct nfsd3_##rest##res),		\
   0,						\
   cache,					\
   respsize,					\
 }

#define ST 1		/* status*/
#define AT 21		/* attributes */
#define pAT (1+AT)	/* post attributes - conditional */
#define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */

static struct svc_procedure		nfsd_acl_procedures3[] = {
  PROC(null,	void,		void,		void,	  RC_NOCACHE, ST),
  PROC(getacl,	getacl,		getacl,		getacl,	  RC_NOCACHE, ST+1+2*(1+ACL)),
  PROC(setacl,	setacl,		setacl,		fhandle,  RC_NOCACHE, ST+pAT),
};

struct svc_version	nfsd_acl_version3 = {
		.vs_vers	= 3,
		.vs_nproc	= 3,
		.vs_proc	= nfsd_acl_procedures3,
		.vs_dispatch	= nfsd_dispatch,
		.vs_xdrsize	= NFS3_SVC_XDRSIZE,
		.vs_hidden	= 0,
};
Commit	Line	Data
a257cdd0 AG	1	/*
	2	* linux/fs/nfsd/nfs3acl.c
	3	*
	4	* Process version 3 NFSACL requests.
	5	*
	6	* Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
	7	*/
	8
	9	#include <linux/sunrpc/svc.h>
	10	#include <linux/nfs3.h>
	11	#include <linux/nfsd/nfsd.h>
	12	#include <linux/nfsd/cache.h>
	13	#include <linux/nfsd/xdr3.h>
	14	#include <linux/posix_acl.h>
	15	#include <linux/nfsacl.h>
	16
	17	#define RETURN_STATUS(st) { resp->status = (st); return (st); }
	18
	19	/*
	20	* NULL call.
	21	*/
7111c66e	22	static __be32
a257cdd0 AG	23	nfsd3_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	24	{
	25	return nfs_ok;
	26	}
	27
	28	/*
	29	* Get the Access and/or Default ACL of a file.
	30	*/
7111c66e	31	static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp,
a257cdd0 AG	32	struct nfsd3_getaclargs argp, struct nfsd3_getaclres resp)
	33	{
	34	svc_fh *fh;
	35	struct posix_acl *acl;
c4d987ba	36	__be32 nfserr = 0;
a257cdd0 AG	37
a257cdd0 AG	38	fh = fh_copy(&resp->fh, &argp->fh);
8837abca MS	39	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
8837abca MS	40	if (nfserr)
ac8587dc	41	RETURN_STATUS(nfserr);
a257cdd0 AG	42
	43	if (argp->mask & ~(NFS_ACL\|NFS_ACLCNT\|NFS_DFACL\|NFS_DFACLCNT))
	44	RETURN_STATUS(nfserr_inval);
	45	resp->mask = argp->mask;
	46
	47	if (resp->mask & (NFS_ACL\|NFS_ACLCNT)) {
	48	acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
	49	if (IS_ERR(acl)) {
	50	int err = PTR_ERR(acl);
	51
	52	if (err == -ENODATA \|\| err == -EOPNOTSUPP)
	53	acl = NULL;
	54	else {
	55	nfserr = nfserrno(err);
	56	goto fail;
	57	}
	58	}
	59	if (acl == NULL) {
	60	/* Solaris returns the inode's minimum ACL. */
	61
	62	struct inode *inode = fh->fh_dentry->d_inode;
	63	acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
	64	}
	65	resp->acl_access = acl;
	66	}
	67	if (resp->mask & (NFS_DFACL\|NFS_DFACLCNT)) {
	68	/* Check how Solaris handles requests for the Default ACL
	69	of a non-directory! */
	70
	71	acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
	72	if (IS_ERR(acl)) {
	73	int err = PTR_ERR(acl);
	74
	75	if (err == -ENODATA \|\| err == -EOPNOTSUPP)
	76	acl = NULL;
	77	else {
	78	nfserr = nfserrno(err);
	79	goto fail;
	80	}
	81	}
	82	resp->acl_default = acl;
	83	}
	84
	85	/* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
	86	RETURN_STATUS(0);
	87
	88	fail:
	89	posix_acl_release(resp->acl_access);
	90	posix_acl_release(resp->acl_default);
	91	RETURN_STATUS(nfserr);
	92	}
	93
	94	/*
	95	* Set the Access and/or Default ACL of a file.
	96	*/
7111c66e	97	static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp,
a257cdd0 AG	98	struct nfsd3_setaclargs *argp,
	99	struct nfsd3_attrstat *resp)
	100	{
	101	svc_fh *fh;
c4d987ba	102	__be32 nfserr = 0;
a257cdd0 AG	103
a257cdd0 AG	104	fh = fh_copy(&resp->fh, &argp->fh);
8837abca	105	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
a257cdd0 AG	106
	107	if (!nfserr) {
	108	nfserr = nfserrno( nfsd_set_posix_acl(
	109	fh, ACL_TYPE_ACCESS, argp->acl_access) );
	110	}
	111	if (!nfserr) {
	112	nfserr = nfserrno( nfsd_set_posix_acl(
	113	fh, ACL_TYPE_DEFAULT, argp->acl_default) );
	114	}
	115
	116	/* argp->acl_{access,default} may have been allocated in
	117	nfs3svc_decode_setaclargs. */
	118	posix_acl_release(argp->acl_access);
	119	posix_acl_release(argp->acl_default);
	120	RETURN_STATUS(nfserr);
	121	}
	122
	123	/*
	124	* XDR decode functions
	125	*/
91f07168	126	static int nfs3svc_decode_getaclargs(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	127	struct nfsd3_getaclargs *args)
	128	{
	129	if (!(p = nfs3svc_decode_fh(p, &args->fh)))
	130	return 0;
	131	args->mask = ntohl(*p); p++;
	132
	133	return xdr_argsize_check(rqstp, p);
	134	}
	135
	136
91f07168	137	static int nfs3svc_decode_setaclargs(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	138	struct nfsd3_setaclargs *args)
	139	{
	140	struct kvec *head = rqstp->rq_arg.head;
	141	unsigned int base;
	142	int n;
	143
	144	if (!(p = nfs3svc_decode_fh(p, &args->fh)))
	145	return 0;
	146	args->mask = ntohl(*p++);
	147	if (args->mask & ~(NFS_ACL\|NFS_ACLCNT\|NFS_DFACL\|NFS_DFACLCNT) \|\|
	148	!xdr_argsize_check(rqstp, p))
	149	return 0;
	150
	151	base = (char )p - (char )head->iov_base;
	152	n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
	153	(args->mask & NFS_ACL) ?
	154	&args->acl_access : NULL);
	155	if (n > 0)
	156	n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
	157	(args->mask & NFS_DFACL) ?
	158	&args->acl_default : NULL);
	159	return (n > 0);
	160	}
	161
	162	/*
	163	* XDR encode functions
	164	*/
	165
	166	/* GETACL */
91f07168	167	static int nfs3svc_encode_getaclres(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	168	struct nfsd3_getaclres *resp)
	169	{
	170	struct dentry *dentry = resp->fh.fh_dentry;
	171
	172	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
	173	if (resp->status == 0 && dentry && dentry->d_inode) {
	174	struct inode *inode = dentry->d_inode;
a257cdd0 AG	175	struct kvec *head = rqstp->rq_res.head;
	176	unsigned int base;
	177	int n;
14d2b59e	178	int w;
a257cdd0 AG	179
	180	*p++ = htonl(resp->mask);
	181	if (!xdr_ressize_check(rqstp, p))
	182	return 0;
	183	base = (char )p - (char )head->iov_base;
	184
14d2b59e JJ	185	rqstp->rq_res.page_len = w = nfsacl_size(
	186	(resp->mask & NFS_ACL) ? resp->acl_access : NULL,
	187	(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
a257cdd0	188	while (w > 0) {
44524359	189	if (!rqstp->rq_respages[rqstp->rq_resused++])
a257cdd0 AG	190	return 0;
	191	w -= PAGE_SIZE;
	192	}
	193
	194	n = nfsacl_encode(&rqstp->rq_res, base, inode,
	195	resp->acl_access,
	196	resp->mask & NFS_ACL, 0);
	197	if (n > 0)
	198	n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
	199	resp->acl_default,
	200	resp->mask & NFS_DFACL,
	201	NFS_ACL_DEFAULT);
	202	if (n <= 0)
	203	return 0;
	204	} else
	205	if (!xdr_ressize_check(rqstp, p))
	206	return 0;
	207
	208	return 1;
	209	}
	210
	211	/* SETACL */
91f07168	212	static int nfs3svc_encode_setaclres(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	213	struct nfsd3_attrstat *resp)
	214	{
	215	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
	216
	217	return xdr_ressize_check(rqstp, p);
	218	}
	219
	220	/*
	221	* XDR release functions
	222	*/
91f07168	223	static int nfs3svc_release_getacl(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	224	struct nfsd3_getaclres *resp)
	225	{
	226	fh_put(&resp->fh);
	227	posix_acl_release(resp->acl_access);
	228	posix_acl_release(resp->acl_default);
	229	return 1;
	230	}
	231
	232	#define nfs3svc_decode_voidargs NULL
	233	#define nfs3svc_release_void NULL
	234	#define nfsd3_setaclres nfsd3_attrstat
	235	#define nfsd3_voidres nfsd3_voidargs
	236	struct nfsd3_voidargs { int dummy; };
	237
	238	#define PROC(name, argt, rest, relt, cache, respsize) \
	239	{ (svc_procfunc) nfsd3_proc_##name, \
	240	(kxdrproc_t) nfs3svc_decode_##argt##args, \
	241	(kxdrproc_t) nfs3svc_encode_##rest##res, \
	242	(kxdrproc_t) nfs3svc_release_##relt, \
	243	sizeof(struct nfsd3_##argt##args), \
	244	sizeof(struct nfsd3_##rest##res), \
	245	0, \
	246	cache, \
	247	respsize, \
	248	}
	249
	250	#define ST 1 /* status*/
	251	#define AT 21 /* attributes */
	252	#define pAT (1+AT) /* post attributes - conditional */
	253	#define ACL (1+NFS_ACL_MAX_ENTRIES3) / Access Control List */
	254
	255	static struct svc_procedure nfsd_acl_procedures3[] = {
	256	PROC(null, void, void, void, RC_NOCACHE, ST),
	257	PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
	258	PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT),
	259	};
	260
	261	struct svc_version nfsd_acl_version3 = {
	262	.vs_vers = 3,
	263	.vs_nproc = 3,
	264	.vs_proc = nfsd_acl_procedures3,
	265	.vs_dispatch = nfsd_dispatch,
	266	.vs_xdrsize = NFS3_SVC_XDRSIZE,
1b7e0403	267	.vs_hidden = 0,
a257cdd0 AG	268	};
a257cdd0 AG	269