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// SPDX-License-Identifier: GPL-2.0
/*
* 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"
/*
* NULL call.
*/
static __be32
nfsd3_proc_null(struct svc_rqst *rqstp)
{
return rpc_success;
}
/*
* 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;
fh = fh_copy(&resp->fh, &argp->fh);
resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
if (resp->status != nfs_ok)
goto out;
inode = d_inode(fh->fh_dentry);
if (argp->mask & ~NFS_ACL_MASK) {
resp->status = nfserr_inval;
goto out;
}
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)) {
resp->status = 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)) {
resp->status = nfserrno(PTR_ERR(acl));
goto fail;
}
resp->acl_default = acl;
}
/* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
out:
return rpc_success;
fail:
posix_acl_release(resp->acl_access);
posix_acl_release(resp->acl_default);
goto out;
}
/*
* 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;
int error;
fh = fh_copy(&resp->fh, &argp->fh);
resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
if (resp->status != nfs_ok)
goto out;
inode = d_inode(fh->fh_dentry);
error = fh_want_write(fh);
if (error)
goto out_errno;
inode_lock(inode);
error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_ACCESS,
argp->acl_access);
if (error)
goto out_drop_lock;
error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_DEFAULT,
argp->acl_default);
out_drop_lock:
inode_unlock(inode);
fh_drop_write(fh);
out_errno:
resp->status = 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 rpc_success;
}
/*
* XDR decode functions
*/
static bool
nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
{
struct nfsd3_getaclargs *args = rqstp->rq_argp;
if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
return false;
if (xdr_stream_decode_u32(xdr, &args->mask) < 0)
return false;
return true;
}
static bool
nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
{
struct nfsd3_setaclargs *argp = rqstp->rq_argp;
if (!svcxdr_decode_nfs_fh3(xdr, &argp->fh))
return false;
if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
return false;
if (argp->mask & ~NFS_ACL_MASK)
return false;
if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_ACL) ?
&argp->acl_access : NULL))
return false;
if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_DFACL) ?
&argp->acl_default : NULL))
return false;
return true;
}
/*
* XDR encode functions
*/
/* GETACL */
static bool
nfs3svc_encode_getaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
{
struct nfsd3_getaclres *resp = rqstp->rq_resp;
struct dentry *dentry = resp->fh.fh_dentry;
struct kvec *head = rqstp->rq_res.head;
struct inode *inode;
unsigned int base;
int n;
int w;
if (!svcxdr_encode_nfsstat3(xdr, resp->status))
return false;
switch (resp->status) {
case nfs_ok:
inode = d_inode(dentry);
if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
return false;
if (xdr_stream_encode_u32(xdr, resp->mask) < 0)
return false;
base = (char *)xdr->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 false;
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 false;
break;
default:
if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
return false;
}
return true;
}
/* SETACL */
static bool
nfs3svc_encode_setaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
{
struct nfsd3_attrstat *resp = rqstp->rq_resp;
return svcxdr_encode_nfsstat3(xdr, resp->status) &&
svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh);
}
/*
* XDR release functions
*/
static void nfs3svc_release_getacl(struct svc_rqst *rqstp)
{
struct nfsd3_getaclres *resp = rqstp->rq_resp;
fh_put(&resp->fh);
posix_acl_release(resp->acl_access);
posix_acl_release(resp->acl_default);
}
struct nfsd3_voidargs { int dummy; };
#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 const struct svc_procedure nfsd_acl_procedures3[3] = {
[ACLPROC3_NULL] = {
.pc_func = nfsd3_proc_null,
.pc_decode = nfssvc_decode_voidarg,
.pc_encode = nfssvc_encode_voidres,
.pc_argsize = sizeof(struct nfsd_voidargs),
.pc_ressize = sizeof(struct nfsd_voidres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST,
.pc_name = "NULL",
},
[ACLPROC3_GETACL] = {
.pc_func = nfsd3_proc_getacl,
.pc_decode = nfs3svc_decode_getaclargs,
.pc_encode = nfs3svc_encode_getaclres,
.pc_release = nfs3svc_release_getacl,
.pc_argsize = sizeof(struct nfsd3_getaclargs),
.pc_ressize = sizeof(struct nfsd3_getaclres),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+1+2*(1+ACL),
.pc_name = "GETACL",
},
[ACLPROC3_SETACL] = {
.pc_func = nfsd3_proc_setacl,
.pc_decode = nfs3svc_decode_setaclargs,
.pc_encode = nfs3svc_encode_setaclres,
.pc_release = nfs3svc_release_fhandle,
.pc_argsize = sizeof(struct nfsd3_setaclargs),
.pc_ressize = sizeof(struct nfsd3_attrstat),
.pc_cachetype = RC_NOCACHE,
.pc_xdrressize = ST+pAT,
.pc_name = "SETACL",
},
};
static unsigned int nfsd_acl_count3[ARRAY_SIZE(nfsd_acl_procedures3)];
const struct svc_version nfsd_acl_version3 = {
.vs_vers = 3,
.vs_nproc = 3,
.vs_proc = nfsd_acl_procedures3,
.vs_count = nfsd_acl_count3,
.vs_dispatch = nfsd_dispatch,
.vs_xdrsize = NFS3_SVC_XDRSIZE,
};
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