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

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

#include "nfsd.h"
/* FIXME: nfsacl.h is a broken header */
#include <linux/nfsacl.h>
#include <linux/gfp.h>
#include "cache.h"
#include "xdr3.h"
#include "vfs.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	1	/*
a257cdd0 AG	2	* Process version 3 NFSACL requests.
	3	*
	4	* Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
	5	*/
	6
9a74af21 BH	7	#include "nfsd.h"
9a74af21 BH	8	/* FIXME: nfsacl.h is a broken header */
a257cdd0	9	#include <linux/nfsacl.h>
5a0e3ad6	10	#include <linux/gfp.h>
9a74af21 BH	11	#include "cache.h"
9a74af21 BH	12	#include "xdr3.h"
0a3adade	13	#include "vfs.h"
a257cdd0 AG	14
	15	#define RETURN_STATUS(st) { resp->status = (st); return (st); }
	16
	17	/*
	18	* NULL call.
	19	*/
7111c66e	20	static __be32
a257cdd0 AG	21	nfsd3_proc_null(struct svc_rqst rqstp, void argp, void *resp)
	22	{
	23	return nfs_ok;
	24	}
	25
	26	/*
	27	* Get the Access and/or Default ACL of a file.
	28	*/
7111c66e	29	static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp,
a257cdd0 AG	30	struct nfsd3_getaclargs argp, struct nfsd3_getaclres resp)
	31	{
	32	svc_fh *fh;
	33	struct posix_acl *acl;
c4d987ba	34	__be32 nfserr = 0;
a257cdd0 AG	35
a257cdd0 AG	36	fh = fh_copy(&resp->fh, &argp->fh);
8837abca MS	37	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
8837abca MS	38	if (nfserr)
ac8587dc	39	RETURN_STATUS(nfserr);
a257cdd0 AG	40
	41	if (argp->mask & ~(NFS_ACL\|NFS_ACLCNT\|NFS_DFACL\|NFS_DFACLCNT))
	42	RETURN_STATUS(nfserr_inval);
	43	resp->mask = argp->mask;
	44
	45	if (resp->mask & (NFS_ACL\|NFS_ACLCNT)) {
	46	acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
	47	if (IS_ERR(acl)) {
	48	int err = PTR_ERR(acl);
	49
	50	if (err == -ENODATA \|\| err == -EOPNOTSUPP)
	51	acl = NULL;
	52	else {
	53	nfserr = nfserrno(err);
	54	goto fail;
	55	}
	56	}
	57	if (acl == NULL) {
	58	/* Solaris returns the inode's minimum ACL. */
	59
	60	struct inode *inode = fh->fh_dentry->d_inode;
	61	acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
	62	}
	63	resp->acl_access = acl;
	64	}
	65	if (resp->mask & (NFS_DFACL\|NFS_DFACLCNT)) {
	66	/* Check how Solaris handles requests for the Default ACL
	67	of a non-directory! */
	68
	69	acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
	70	if (IS_ERR(acl)) {
	71	int err = PTR_ERR(acl);
	72
	73	if (err == -ENODATA \|\| err == -EOPNOTSUPP)
	74	acl = NULL;
	75	else {
	76	nfserr = nfserrno(err);
	77	goto fail;
	78	}
	79	}
	80	resp->acl_default = acl;
	81	}
	82
	83	/* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
	84	RETURN_STATUS(0);
	85
	86	fail:
	87	posix_acl_release(resp->acl_access);
	88	posix_acl_release(resp->acl_default);
	89	RETURN_STATUS(nfserr);
	90	}
	91
	92	/*
	93	* Set the Access and/or Default ACL of a file.
	94	*/
7111c66e	95	static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp,
a257cdd0 AG	96	struct nfsd3_setaclargs *argp,
	97	struct nfsd3_attrstat *resp)
	98	{
	99	svc_fh *fh;
c4d987ba	100	__be32 nfserr = 0;
a257cdd0 AG	101
a257cdd0 AG	102	fh = fh_copy(&resp->fh, &argp->fh);
8837abca	103	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
a257cdd0 AG	104
	105	if (!nfserr) {
	106	nfserr = nfserrno( nfsd_set_posix_acl(
	107	fh, ACL_TYPE_ACCESS, argp->acl_access) );
	108	}
	109	if (!nfserr) {
	110	nfserr = nfserrno( nfsd_set_posix_acl(
	111	fh, ACL_TYPE_DEFAULT, argp->acl_default) );
	112	}
	113
	114	/* argp->acl_{access,default} may have been allocated in
	115	nfs3svc_decode_setaclargs. */
	116	posix_acl_release(argp->acl_access);
	117	posix_acl_release(argp->acl_default);
	118	RETURN_STATUS(nfserr);
	119	}
	120
	121	/*
	122	* XDR decode functions
	123	*/
91f07168	124	static int nfs3svc_decode_getaclargs(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	125	struct nfsd3_getaclargs *args)
	126	{
	127	if (!(p = nfs3svc_decode_fh(p, &args->fh)))
	128	return 0;
	129	args->mask = ntohl(*p); p++;
	130
	131	return xdr_argsize_check(rqstp, p);
	132	}
	133
	134
91f07168	135	static int nfs3svc_decode_setaclargs(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	136	struct nfsd3_setaclargs *args)
	137	{
	138	struct kvec *head = rqstp->rq_arg.head;
	139	unsigned int base;
	140	int n;
	141
	142	if (!(p = nfs3svc_decode_fh(p, &args->fh)))
	143	return 0;
	144	args->mask = ntohl(*p++);
	145	if (args->mask & ~(NFS_ACL\|NFS_ACLCNT\|NFS_DFACL\|NFS_DFACLCNT) \|\|
	146	!xdr_argsize_check(rqstp, p))
	147	return 0;
	148
	149	base = (char )p - (char )head->iov_base;
	150	n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
	151	(args->mask & NFS_ACL) ?
	152	&args->acl_access : NULL);
	153	if (n > 0)
	154	n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
	155	(args->mask & NFS_DFACL) ?
	156	&args->acl_default : NULL);
	157	return (n > 0);
	158	}
	159
	160	/*
	161	* XDR encode functions
	162	*/
	163
	164	/* GETACL */
91f07168	165	static int nfs3svc_encode_getaclres(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	166	struct nfsd3_getaclres *resp)
	167	{
	168	struct dentry *dentry = resp->fh.fh_dentry;
	169
	170	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
	171	if (resp->status == 0 && dentry && dentry->d_inode) {
	172	struct inode *inode = dentry->d_inode;
a257cdd0 AG	173	struct kvec *head = rqstp->rq_res.head;
	174	unsigned int base;
	175	int n;
14d2b59e	176	int w;
a257cdd0 AG	177
	178	*p++ = htonl(resp->mask);
	179	if (!xdr_ressize_check(rqstp, p))
	180	return 0;
	181	base = (char )p - (char )head->iov_base;
	182
14d2b59e JJ	183	rqstp->rq_res.page_len = w = nfsacl_size(
	184	(resp->mask & NFS_ACL) ? resp->acl_access : NULL,
	185	(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
a257cdd0	186	while (w > 0) {
44524359	187	if (!rqstp->rq_respages[rqstp->rq_resused++])
a257cdd0 AG	188	return 0;
	189	w -= PAGE_SIZE;
	190	}
	191
	192	n = nfsacl_encode(&rqstp->rq_res, base, inode,
	193	resp->acl_access,
	194	resp->mask & NFS_ACL, 0);
	195	if (n > 0)
	196	n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
	197	resp->acl_default,
	198	resp->mask & NFS_DFACL,
	199	NFS_ACL_DEFAULT);
	200	if (n <= 0)
	201	return 0;
	202	} else
	203	if (!xdr_ressize_check(rqstp, p))
	204	return 0;
	205
	206	return 1;
	207	}
	208
	209	/* SETACL */
91f07168	210	static int nfs3svc_encode_setaclres(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	211	struct nfsd3_attrstat *resp)
	212	{
	213	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
	214
	215	return xdr_ressize_check(rqstp, p);
	216	}
	217
	218	/*
	219	* XDR release functions
	220	*/
91f07168	221	static int nfs3svc_release_getacl(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	222	struct nfsd3_getaclres *resp)
	223	{
	224	fh_put(&resp->fh);
	225	posix_acl_release(resp->acl_access);
	226	posix_acl_release(resp->acl_default);
	227	return 1;
	228	}
	229
	230	#define nfs3svc_decode_voidargs NULL
	231	#define nfs3svc_release_void NULL
	232	#define nfsd3_setaclres nfsd3_attrstat
	233	#define nfsd3_voidres nfsd3_voidargs
	234	struct nfsd3_voidargs { int dummy; };
	235
	236	#define PROC(name, argt, rest, relt, cache, respsize) \
	237	{ (svc_procfunc) nfsd3_proc_##name, \
	238	(kxdrproc_t) nfs3svc_decode_##argt##args, \
	239	(kxdrproc_t) nfs3svc_encode_##rest##res, \
	240	(kxdrproc_t) nfs3svc_release_##relt, \
	241	sizeof(struct nfsd3_##argt##args), \
	242	sizeof(struct nfsd3_##rest##res), \
	243	0, \
	244	cache, \
	245	respsize, \
	246	}
	247
	248	#define ST 1 /* status*/
	249	#define AT 21 /* attributes */
	250	#define pAT (1+AT) /* post attributes - conditional */
	251	#define ACL (1+NFS_ACL_MAX_ENTRIES3) / Access Control List */
	252
	253	static struct svc_procedure nfsd_acl_procedures3[] = {
	254	PROC(null, void, void, void, RC_NOCACHE, ST),
	255	PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
	256	PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT),
	257	};
	258
	259	struct svc_version nfsd_acl_version3 = {
	260	.vs_vers = 3,
	261	.vs_nproc = 3,
	262	.vs_proc = nfsd_acl_procedures3,
	263	.vs_dispatch = nfsd_dispatch,
	264	.vs_xdrsize = NFS3_SVC_XDRSIZE,
1b7e0403	265	.vs_hidden = 0,
a257cdd0 AG	266	};
a257cdd0 AG	267