// SPDX-License-Identifier: GPL-2.0

  /*

   * Process version 2 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 NFSDDBG_FACILITY		NFSDDBG_PROC
  #define RETURN_STATUS(st)	{ resp->status = (st); return (st); }
  
  /*
   * NULL call.
   */

  static __be32

  nfsacld_proc_null(struct svc_rqst *rqstp)

  {
  	return nfs_ok;
  }
  
  /*
   * Get the Access and/or Default ACL of a file.
   */

  static __be32 nfsacld_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;

  
  	dprintk("nfsd: GETACL(2acl)   %s
  ", SVCFH_fmt(&argp->fh));
  
  	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;

  	nfserr = fh_getattr(fh, &resp->stat);
  	if (nfserr)

  		RETURN_STATUS(nfserr);

  	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 nfssvc_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 nfsacld_proc_setacl(struct svc_rqst *rqstp)

  {

  	struct nfsd3_setaclargs *argp = rqstp->rq_argp;
  	struct nfsd_attrstat *resp = rqstp->rq_resp;

  	struct inode *inode;

  	svc_fh *fh;

  	__be32 nfserr = 0;

  	int error;

  
  	dprintk("nfsd: SETACL(2acl)   %s
  ", SVCFH_fmt(&argp->fh));
  
  	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);

  	if (error)

  		goto out_drop_lock;
  
  	fh_unlock(fh);

  
  	fh_drop_write(fh);
  
  	nfserr = fh_getattr(fh, &resp->stat);
  
  out:

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

  out_drop_lock:
  	fh_unlock(fh);

  	fh_drop_write(fh);
  out_errno:
  	nfserr = nfserrno(error);
  	goto out;

  }
  
  /*
   * Check file attributes
   */

  static __be32 nfsacld_proc_getattr(struct svc_rqst *rqstp)

  {

  	struct nfsd_fhandle *argp = rqstp->rq_argp;
  	struct nfsd_attrstat *resp = rqstp->rq_resp;

  	__be32 nfserr;

  	dprintk("nfsd: GETATTR  %s
  ", SVCFH_fmt(&argp->fh));
  
  	fh_copy(&resp->fh, &argp->fh);

  	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
  	if (nfserr)
  		return nfserr;
  	nfserr = fh_getattr(&resp->fh, &resp->stat);
  	return nfserr;

  }
  
  /*
   * Check file access
   */

  static __be32 nfsacld_proc_access(struct svc_rqst *rqstp)

  {

  	struct nfsd3_accessargs *argp = rqstp->rq_argp;
  	struct nfsd3_accessres *resp = rqstp->rq_resp;

  	__be32 nfserr;

  
  	dprintk("nfsd: ACCESS(2acl)   %s 0x%x
  ",
  			SVCFH_fmt(&argp->fh),
  			argp->access);
  
  	fh_copy(&resp->fh, &argp->fh);
  	resp->access = argp->access;
  	nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);

  	if (nfserr)
  		return nfserr;
  	nfserr = fh_getattr(&resp->fh, &resp->stat);

  	return nfserr;
  }
  
  /*
   * XDR decode functions
   */

  static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p)

  {

  	struct nfsd3_getaclargs *argp = rqstp->rq_argp;

  	p = nfs2svc_decode_fh(p, &argp->fh);
  	if (!p)

  		return 0;
  	argp->mask = ntohl(*p); p++;
  
  	return xdr_argsize_check(rqstp, p);
  }

  static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p)

  {

  	struct nfsd3_setaclargs *argp = rqstp->rq_argp;

  	struct kvec *head = rqstp->rq_arg.head;
  	unsigned int base;
  	int n;

  	p = nfs2svc_decode_fh(p, &argp->fh);
  	if (!p)

  		return 0;
  	argp->mask = ntohl(*p++);

  	if (argp->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,
  			  (argp->mask & NFS_ACL) ?
  			  &argp->acl_access : NULL);
  	if (n > 0)
  		n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
  				  (argp->mask & NFS_DFACL) ?
  				  &argp->acl_default : NULL);
  	return (n > 0);
  }

  static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p)

  {

  	struct nfsd_fhandle *argp = rqstp->rq_argp;

  	p = nfs2svc_decode_fh(p, &argp->fh);
  	if (!p)

  		return 0;
  	return xdr_argsize_check(rqstp, p);
  }

  static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)

  {

  	struct nfsd3_accessargs *argp = rqstp->rq_argp;

  	p = nfs2svc_decode_fh(p, &argp->fh);
  	if (!p)

  		return 0;
  	argp->access = ntohl(*p++);
  
  	return xdr_argsize_check(rqstp, p);
  }
  
  /*
   * XDR encode functions
   */

  /*
   * There must be an encoding function for void results so svc_process
   * will work properly.
   */

  static int nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)

  {
  	return xdr_ressize_check(rqstp, p);
  }

  /* GETACL */

  static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p)

  {

  	struct nfsd3_getaclres *resp = rqstp->rq_resp;

  	struct dentry *dentry = resp->fh.fh_dentry;

  	struct inode *inode;

  	struct kvec *head = rqstp->rq_res.head;
  	unsigned int base;
  	int n;

  	int w;

  	/*
  	 * Since this is version 2, the check for nfserr in
  	 * nfsd_dispatch actually ensures the following cannot happen.
  	 * However, it seems fragile to depend on that.
  	 */

  	if (dentry == NULL || d_really_is_negative(dentry))

  		return 0;

  	inode = d_inode(dentry);

  	p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);

  	*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);

  	return (n > 0);

  }

  static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p)

  {

  	struct nfsd_attrstat *resp = rqstp->rq_resp;

  	p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);

  	return xdr_ressize_check(rqstp, p);
  }
  
  /* ACCESS */

  static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)

  {

  	struct nfsd3_accessres *resp = rqstp->rq_resp;

  	p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);

  	*p++ = htonl(resp->access);
  	return xdr_ressize_check(rqstp, p);
  }
  
  /*
   * XDR release functions
   */

  static void nfsaclsvc_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);

  }

  static void nfsaclsvc_release_attrstat(struct svc_rqst *rqstp)

  {

  	struct nfsd_attrstat *resp = rqstp->rq_resp;

  	fh_put(&resp->fh);

  }

  static void nfsaclsvc_release_access(struct svc_rqst *rqstp)

  {

  	struct nfsd3_accessres *resp = rqstp->rq_resp;
  
  	fh_put(&resp->fh);

  }

  #define nfsaclsvc_decode_voidargs	NULL

  #define nfsaclsvc_release_void		NULL
  #define nfsd3_fhandleargs	nfsd_fhandle
  #define nfsd3_attrstatres	nfsd_attrstat
  #define nfsd3_voidres		nfsd3_voidargs
  struct nfsd3_voidargs { int dummy; };

  #define PROC(name, argt, rest, relt, cache, respsize)			\
  {									\

  	.pc_func	= nfsacld_proc_##name,				\

  	.pc_decode	= nfsaclsvc_decode_##argt##args,		\

  	.pc_encode	= nfsaclsvc_encode_##rest##res,			\

  	.pc_release	= nfsaclsvc_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 const struct svc_procedure nfsd_acl_procedures2[] = {

    PROC(null,	void,		void,		void,	  RC_NOCACHE, ST),
    PROC(getacl,	getacl,		getacl,		getacl,	  RC_NOCACHE, ST+1+2*(1+ACL)),

    PROC(setacl,	setacl,		attrstat,	attrstat, RC_NOCACHE, ST+AT),
    PROC(getattr, fhandle,	attrstat,	attrstat, RC_NOCACHE, ST+AT),
    PROC(access,	access,		access,		access,   RC_NOCACHE, ST+AT+1),

  };

  static unsigned int nfsd_acl_count2[ARRAY_SIZE(nfsd_acl_procedures2)];

  const struct svc_version nfsd_acl_version2 = {
  	.vs_vers	= 2,
  	.vs_nproc	= 5,
  	.vs_proc	= nfsd_acl_procedures2,
  	.vs_count	= nfsd_acl_count2,
  	.vs_dispatch	= nfsd_dispatch,
  	.vs_xdrsize	= NFS3_SVC_XDRSIZE,

  };