[mirror_ubuntu-bionic-kernel.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)
{
	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 = rqstp->rq_argp;
	struct nfsd3_getaclres *resp = rqstp->rq_resp;
	struct posix_acl *acl;
	struct inode *inode;
	svc_fh *fh;
	__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);

	inode = d_inode(fh->fh_dentry);

	if (argp->mask & ~NFS_ACL_MASK)
		RETURN_STATUS(nfserr_inval);
	resp->mask = argp->mask;

	if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
		acl = get_acl(inode, ACL_TYPE_ACCESS);
		if (acl == NULL) {
			/* Solaris returns the inode's minimum ACL. */
			acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
		}
		if (IS_ERR(acl)) {
			nfserr = nfserrno(PTR_ERR(acl));
			goto fail;
		}
		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 = get_acl(inode, ACL_TYPE_DEFAULT);
		if (IS_ERR(acl)) {
			nfserr = nfserrno(PTR_ERR(acl));
			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 = rqstp->rq_argp;
	struct nfsd3_attrstat *resp = rqstp->rq_resp;
	struct inode *inode;
	svc_fh *fh;
	__be32 nfserr = 0;
	int error;

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

	inode = d_inode(fh->fh_dentry);

	error = fh_want_write(fh);
	if (error)
		goto out_errno;

	fh_lock(fh);

	error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access);
	if (error)
		goto out_drop_lock;
	error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default);

out_drop_lock:
	fh_unlock(fh);
	fh_drop_write(fh);
out_errno:
	nfserr = nfserrno(error);
out:
	/* 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)
{
	p = nfs3svc_decode_fh(p, &args->fh);
	if (!p)
		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;

	p = nfs3svc_decode_fh(p, &args->fh);
	if (!p)
		return 0;
	args->mask = ntohl(*p++);
	if (args->mask & ~NFS_ACL_MASK ||
	    !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 && d_really_is_positive(dentry)) {
		struct inode *inode = d_inode(dentry);
		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_next_page++))
				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)			\
{									\
	.pc_func	= nfsd3_proc_##name,				\
	.pc_decode	= (kxdrproc_t) nfs3svc_decode_##argt##args,	\
	.pc_encode	= (kxdrproc_t) nfs3svc_encode_##rest##res,	\
	.pc_release	= (kxdrproc_t) nfs3svc_release_##relt,		\
	.pc_argsize	= sizeof(struct nfsd3_##argt##args),		\
	.pc_ressize	= sizeof(struct nfsd3_##rest##res),		\
	.pc_cachetype	= cache,					\
	.pc_xdrressize	= 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,
};
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
a6beb732	21	nfsd3_proc_null(struct svc_rqst *rqstp)
a257cdd0 AG	22	{
	23	return nfs_ok;
	24	}
	25
	26	/*
	27	* Get the Access and/or Default ACL of a file.
	28	*/
a6beb732	29	static __be32 nfsd3_proc_getacl(struct svc_rqst *rqstp)
a257cdd0	30	{
a6beb732 CH	31	struct nfsd3_getaclargs *argp = rqstp->rq_argp;
a6beb732 CH	32	struct nfsd3_getaclres *resp = rqstp->rq_resp;
a257cdd0	33	struct posix_acl *acl;
4ac7249e CH	34	struct inode *inode;
4ac7249e CH	35	svc_fh *fh;
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	42
2b0143b5	43	inode = d_inode(fh->fh_dentry);
4ac7249e	44
7b8f4586	45	if (argp->mask & ~NFS_ACL_MASK)
a257cdd0 AG	46	RETURN_STATUS(nfserr_inval);
	47	resp->mask = argp->mask;
	48
	49	if (resp->mask & (NFS_ACL\|NFS_ACLCNT)) {
4ac7249e	50	acl = get_acl(inode, ACL_TYPE_ACCESS);
a257cdd0 AG	51	if (acl == NULL) {
a257cdd0 AG	52	/* Solaris returns the inode's minimum ACL. */
a257cdd0 AG	53	acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
a257cdd0 AG	54	}
35e634b8 KM	55	if (IS_ERR(acl)) {
	56	nfserr = nfserrno(PTR_ERR(acl));
	57	goto fail;
	58	}
a257cdd0 AG	59	resp->acl_access = acl;
	60	}
	61	if (resp->mask & (NFS_DFACL\|NFS_DFACLCNT)) {
	62	/* Check how Solaris handles requests for the Default ACL
	63	of a non-directory! */
4ac7249e	64	acl = get_acl(inode, ACL_TYPE_DEFAULT);
a257cdd0	65	if (IS_ERR(acl)) {
4ac7249e CH	66	nfserr = nfserrno(PTR_ERR(acl));
4ac7249e CH	67	goto fail;
a257cdd0 AG	68	}
	69	resp->acl_default = acl;
	70	}
	71
	72	/* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
	73	RETURN_STATUS(0);
	74
	75	fail:
	76	posix_acl_release(resp->acl_access);
	77	posix_acl_release(resp->acl_default);
	78	RETURN_STATUS(nfserr);
	79	}
	80
	81	/*
	82	* Set the Access and/or Default ACL of a file.
	83	*/
a6beb732	84	static __be32 nfsd3_proc_setacl(struct svc_rqst *rqstp)
a257cdd0	85	{
a6beb732 CH	86	struct nfsd3_setaclargs *argp = rqstp->rq_argp;
a6beb732 CH	87	struct nfsd3_attrstat *resp = rqstp->rq_resp;
4ac7249e	88	struct inode *inode;
a257cdd0	89	svc_fh *fh;
c4d987ba	90	__be32 nfserr = 0;
4ac7249e	91	int error;
a257cdd0 AG	92
a257cdd0 AG	93	fh = fh_copy(&resp->fh, &argp->fh);
8837abca	94	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
4ac7249e CH	95	if (nfserr)
4ac7249e CH	96	goto out;
a257cdd0	97
2b0143b5	98	inode = d_inode(fh->fh_dentry);
a257cdd0	99
4ac7249e CH	100	error = fh_want_write(fh);
	101	if (error)
	102	goto out_errno;
	103
99965378 BH	104	fh_lock(fh);
	105
	106	error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access);
4ac7249e	107	if (error)
99965378 BH	108	goto out_drop_lock;
99965378 BH	109	error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default);
4ac7249e	110
99965378 BH	111	out_drop_lock:
99965378 BH	112	fh_unlock(fh);
4ac7249e CH	113	fh_drop_write(fh);
	114	out_errno:
	115	nfserr = nfserrno(error);
	116	out:
a257cdd0 AG	117	/* argp->acl_{access,default} may have been allocated in
	118	nfs3svc_decode_setaclargs. */
	119	posix_acl_release(argp->acl_access);
	120	posix_acl_release(argp->acl_default);
	121	RETURN_STATUS(nfserr);
	122	}
	123
	124	/*
	125	* XDR decode functions
	126	*/
91f07168	127	static int nfs3svc_decode_getaclargs(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	128	struct nfsd3_getaclargs *args)
a257cdd0 AG	129	{
d40aa337 BT	130	p = nfs3svc_decode_fh(p, &args->fh);
d40aa337 BT	131	if (!p)
a257cdd0 AG	132	return 0;
	133	args->mask = ntohl(*p); p++;
	134
	135	return xdr_argsize_check(rqstp, p);
	136	}
	137
	138
91f07168	139	static int nfs3svc_decode_setaclargs(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	140	struct nfsd3_setaclargs *args)
	141	{
	142	struct kvec *head = rqstp->rq_arg.head;
	143	unsigned int base;
	144	int n;
	145
d40aa337 BT	146	p = nfs3svc_decode_fh(p, &args->fh);
d40aa337 BT	147	if (!p)
a257cdd0 AG	148	return 0;
a257cdd0 AG	149	args->mask = ntohl(*p++);
7b8f4586	150	if (args->mask & ~NFS_ACL_MASK \|\|
a257cdd0 AG	151	!xdr_argsize_check(rqstp, p))
	152	return 0;
	153
	154	base = (char )p - (char )head->iov_base;
	155	n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
	156	(args->mask & NFS_ACL) ?
	157	&args->acl_access : NULL);
	158	if (n > 0)
	159	n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
	160	(args->mask & NFS_DFACL) ?
	161	&args->acl_default : NULL);
	162	return (n > 0);
	163	}
	164
	165	/*
	166	* XDR encode functions
	167	*/
	168
	169	/* GETACL */
91f07168	170	static int nfs3svc_encode_getaclres(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	171	struct nfsd3_getaclres *resp)
	172	{
	173	struct dentry *dentry = resp->fh.fh_dentry;
	174
	175	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
2b0143b5 DH	176	if (resp->status == 0 && dentry && d_really_is_positive(dentry)) {
2b0143b5 DH	177	struct inode *inode = d_inode(dentry);
a257cdd0 AG	178	struct kvec *head = rqstp->rq_res.head;
	179	unsigned int base;
	180	int n;
14d2b59e	181	int w;
a257cdd0 AG	182
	183	*p++ = htonl(resp->mask);
	184	if (!xdr_ressize_check(rqstp, p))
	185	return 0;
	186	base = (char )p - (char )head->iov_base;
	187
14d2b59e JJ	188	rqstp->rq_res.page_len = w = nfsacl_size(
	189	(resp->mask & NFS_ACL) ? resp->acl_access : NULL,
	190	(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
a257cdd0	191	while (w > 0) {
afc59400	192	if (!*(rqstp->rq_next_page++))
a257cdd0 AG	193	return 0;
	194	w -= PAGE_SIZE;
	195	}
	196
	197	n = nfsacl_encode(&rqstp->rq_res, base, inode,
	198	resp->acl_access,
	199	resp->mask & NFS_ACL, 0);
	200	if (n > 0)
	201	n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
	202	resp->acl_default,
	203	resp->mask & NFS_DFACL,
	204	NFS_ACL_DEFAULT);
	205	if (n <= 0)
	206	return 0;
	207	} else
	208	if (!xdr_ressize_check(rqstp, p))
	209	return 0;
	210
	211	return 1;
	212	}
	213
	214	/* SETACL */
91f07168	215	static int nfs3svc_encode_setaclres(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	216	struct nfsd3_attrstat *resp)
	217	{
	218	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
	219
	220	return xdr_ressize_check(rqstp, p);
	221	}
	222
	223	/*
	224	* XDR release functions
	225	*/
91f07168	226	static int nfs3svc_release_getacl(struct svc_rqst rqstp, __be32 p,
a257cdd0 AG	227	struct nfsd3_getaclres *resp)
	228	{
	229	fh_put(&resp->fh);
	230	posix_acl_release(resp->acl_access);
	231	posix_acl_release(resp->acl_default);
	232	return 1;
	233	}
	234
	235	#define nfs3svc_decode_voidargs NULL
	236	#define nfs3svc_release_void NULL
	237	#define nfsd3_setaclres nfsd3_attrstat
	238	#define nfsd3_voidres nfsd3_voidargs
	239	struct nfsd3_voidargs { int dummy; };
	240
f7235b6b CH	241	#define PROC(name, argt, rest, relt, cache, respsize) \
f7235b6b CH	242	{ \
a6beb732	243	.pc_func = nfsd3_proc_##name, \
f7235b6b CH	244	.pc_decode = (kxdrproc_t) nfs3svc_decode_##argt##args, \
	245	.pc_encode = (kxdrproc_t) nfs3svc_encode_##rest##res, \
	246	.pc_release = (kxdrproc_t) nfs3svc_release_##relt, \
	247	.pc_argsize = sizeof(struct nfsd3_##argt##args), \
	248	.pc_ressize = sizeof(struct nfsd3_##rest##res), \
	249	.pc_cachetype = cache, \
	250	.pc_xdrressize = respsize, \
	251	}
a257cdd0 AG	252
	253	#define ST 1 /* status*/
	254	#define AT 21 /* attributes */
	255	#define pAT (1+AT) /* post attributes - conditional */
	256	#define ACL (1+NFS_ACL_MAX_ENTRIES3) / Access Control List */
	257
	258	static struct svc_procedure nfsd_acl_procedures3[] = {
	259	PROC(null, void, void, void, RC_NOCACHE, ST),
	260	PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
	261	PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT),
	262	};
	263
	264	struct svc_version nfsd_acl_version3 = {
	265	.vs_vers = 3,
	266	.vs_nproc = 3,
	267	.vs_proc = nfsd_acl_procedures3,
	268	.vs_dispatch = nfsd_dispatch,
	269	.vs_xdrsize = NFS3_SVC_XDRSIZE,
	270	};
	271