Orange Pi5 kernel

// 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;
 
<------>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:
<------>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 int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p)
{
<------>struct nfsd3_getaclargs *args = rqstp->rq_argp;
 
<------>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 = rqstp->rq_argp;
<------>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 = rqstp->rq_resp;
<------>struct dentry *dentry = resp->fh.fh_dentry;
 
<------>*p++ = resp->status;
<------>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 = rqstp->rq_resp;
 
<------>*p++ = resp->status;
<------>p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
<------>return xdr_ressize_check(rqstp, p);
}
 
/*
 * 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 = nfs3svc_decode_voidarg,
<------><------>.pc_encode = nfs3svc_encode_voidres,
<------><------>.pc_argsize = sizeof(struct nfsd3_voidargs),
<------><------>.pc_ressize = sizeof(struct nfsd3_voidargs),
<------><------>.pc_cachetype = RC_NOCACHE,
<------><------>.pc_xdrressize = ST,
<------>},
<------>[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),
<------>},
<------>[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,
<------>},
};
 
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,
};