294 lines
6.9 KiB
C
294 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Process version 3 NFSACL requests.
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*
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* Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
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*/
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#include "nfsd.h"
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/* FIXME: nfsacl.h is a broken header */
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#include <linux/nfsacl.h>
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#include <linux/gfp.h>
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#include "cache.h"
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#include "xdr3.h"
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#include "vfs.h"
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/*
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* NULL call.
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*/
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static __be32
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nfsd3_proc_null(struct svc_rqst *rqstp)
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{
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return rpc_success;
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}
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/*
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* Get the Access and/or Default ACL of a file.
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*/
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static __be32 nfsd3_proc_getacl(struct svc_rqst *rqstp)
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{
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struct nfsd3_getaclargs *argp = rqstp->rq_argp;
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struct nfsd3_getaclres *resp = rqstp->rq_resp;
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struct posix_acl *acl;
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struct inode *inode;
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svc_fh *fh;
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fh = fh_copy(&resp->fh, &argp->fh);
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resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
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if (resp->status != nfs_ok)
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goto out;
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inode = d_inode(fh->fh_dentry);
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if (argp->mask & ~NFS_ACL_MASK) {
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resp->status = nfserr_inval;
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goto out;
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}
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resp->mask = argp->mask;
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if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
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acl = get_acl(inode, ACL_TYPE_ACCESS);
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if (acl == NULL) {
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/* Solaris returns the inode's minimum ACL. */
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acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
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}
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if (IS_ERR(acl)) {
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resp->status = nfserrno(PTR_ERR(acl));
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goto fail;
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}
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resp->acl_access = acl;
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}
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if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
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/* Check how Solaris handles requests for the Default ACL
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of a non-directory! */
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acl = get_acl(inode, ACL_TYPE_DEFAULT);
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if (IS_ERR(acl)) {
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resp->status = nfserrno(PTR_ERR(acl));
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goto fail;
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}
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resp->acl_default = acl;
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}
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/* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
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out:
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return rpc_success;
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fail:
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posix_acl_release(resp->acl_access);
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posix_acl_release(resp->acl_default);
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goto out;
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}
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/*
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* Set the Access and/or Default ACL of a file.
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*/
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static __be32 nfsd3_proc_setacl(struct svc_rqst *rqstp)
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{
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struct nfsd3_setaclargs *argp = rqstp->rq_argp;
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struct nfsd3_attrstat *resp = rqstp->rq_resp;
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struct inode *inode;
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svc_fh *fh;
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int error;
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fh = fh_copy(&resp->fh, &argp->fh);
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resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
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if (resp->status != nfs_ok)
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goto out;
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inode = d_inode(fh->fh_dentry);
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error = fh_want_write(fh);
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if (error)
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goto out_errno;
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inode_lock(inode);
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error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_ACCESS,
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argp->acl_access);
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if (error)
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goto out_drop_lock;
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error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_DEFAULT,
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argp->acl_default);
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out_drop_lock:
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inode_unlock(inode);
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fh_drop_write(fh);
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out_errno:
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resp->status = nfserrno(error);
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out:
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/* argp->acl_{access,default} may have been allocated in
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nfs3svc_decode_setaclargs. */
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posix_acl_release(argp->acl_access);
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posix_acl_release(argp->acl_default);
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return rpc_success;
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}
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/*
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* XDR decode functions
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*/
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static bool
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nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
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{
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struct nfsd3_getaclargs *args = rqstp->rq_argp;
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if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
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return false;
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if (xdr_stream_decode_u32(xdr, &args->mask) < 0)
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return false;
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return true;
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}
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static bool
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nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
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{
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struct nfsd3_setaclargs *argp = rqstp->rq_argp;
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if (!svcxdr_decode_nfs_fh3(xdr, &argp->fh))
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return false;
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if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
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return false;
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if (argp->mask & ~NFS_ACL_MASK)
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return false;
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if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_ACL) ?
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&argp->acl_access : NULL))
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return false;
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if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_DFACL) ?
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&argp->acl_default : NULL))
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return false;
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return true;
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}
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/*
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* XDR encode functions
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*/
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/* GETACL */
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static bool
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nfs3svc_encode_getaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
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{
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struct nfsd3_getaclres *resp = rqstp->rq_resp;
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struct dentry *dentry = resp->fh.fh_dentry;
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struct kvec *head = rqstp->rq_res.head;
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struct inode *inode;
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unsigned int base;
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int n;
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int w;
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if (!svcxdr_encode_nfsstat3(xdr, resp->status))
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return false;
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switch (resp->status) {
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case nfs_ok:
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inode = d_inode(dentry);
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if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
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return false;
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if (xdr_stream_encode_u32(xdr, resp->mask) < 0)
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return false;
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base = (char *)xdr->p - (char *)head->iov_base;
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rqstp->rq_res.page_len = w = nfsacl_size(
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(resp->mask & NFS_ACL) ? resp->acl_access : NULL,
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(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
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while (w > 0) {
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if (!*(rqstp->rq_next_page++))
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return false;
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w -= PAGE_SIZE;
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}
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n = nfsacl_encode(&rqstp->rq_res, base, inode,
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resp->acl_access,
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resp->mask & NFS_ACL, 0);
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if (n > 0)
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n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
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resp->acl_default,
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resp->mask & NFS_DFACL,
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NFS_ACL_DEFAULT);
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if (n <= 0)
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return false;
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break;
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default:
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if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
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return false;
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}
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return true;
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}
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/* SETACL */
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static bool
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nfs3svc_encode_setaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
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{
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struct nfsd3_attrstat *resp = rqstp->rq_resp;
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return svcxdr_encode_nfsstat3(xdr, resp->status) &&
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svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh);
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}
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/*
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* XDR release functions
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*/
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static void nfs3svc_release_getacl(struct svc_rqst *rqstp)
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{
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struct nfsd3_getaclres *resp = rqstp->rq_resp;
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fh_put(&resp->fh);
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posix_acl_release(resp->acl_access);
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posix_acl_release(resp->acl_default);
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}
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struct nfsd3_voidargs { int dummy; };
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#define ST 1 /* status*/
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#define AT 21 /* attributes */
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#define pAT (1+AT) /* post attributes - conditional */
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#define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
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static const struct svc_procedure nfsd_acl_procedures3[3] = {
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[ACLPROC3_NULL] = {
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.pc_func = nfsd3_proc_null,
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.pc_decode = nfssvc_decode_voidarg,
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.pc_encode = nfssvc_encode_voidres,
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.pc_argsize = sizeof(struct nfsd_voidargs),
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.pc_ressize = sizeof(struct nfsd_voidres),
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.pc_cachetype = RC_NOCACHE,
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.pc_xdrressize = ST,
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.pc_name = "NULL",
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},
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[ACLPROC3_GETACL] = {
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.pc_func = nfsd3_proc_getacl,
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.pc_decode = nfs3svc_decode_getaclargs,
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.pc_encode = nfs3svc_encode_getaclres,
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.pc_release = nfs3svc_release_getacl,
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.pc_argsize = sizeof(struct nfsd3_getaclargs),
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.pc_ressize = sizeof(struct nfsd3_getaclres),
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.pc_cachetype = RC_NOCACHE,
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.pc_xdrressize = ST+1+2*(1+ACL),
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.pc_name = "GETACL",
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},
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[ACLPROC3_SETACL] = {
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.pc_func = nfsd3_proc_setacl,
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.pc_decode = nfs3svc_decode_setaclargs,
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.pc_encode = nfs3svc_encode_setaclres,
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.pc_release = nfs3svc_release_fhandle,
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.pc_argsize = sizeof(struct nfsd3_setaclargs),
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.pc_ressize = sizeof(struct nfsd3_attrstat),
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.pc_cachetype = RC_NOCACHE,
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.pc_xdrressize = ST+pAT,
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.pc_name = "SETACL",
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},
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};
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static unsigned int nfsd_acl_count3[ARRAY_SIZE(nfsd_acl_procedures3)];
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const struct svc_version nfsd_acl_version3 = {
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.vs_vers = 3,
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.vs_nproc = 3,
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.vs_proc = nfsd_acl_procedures3,
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.vs_count = nfsd_acl_count3,
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.vs_dispatch = nfsd_dispatch,
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.vs_xdrsize = NFS3_SVC_XDRSIZE,
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};
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