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296 lines
7.0 KiB
296 lines
7.0 KiB
// 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 <[email protected]> |
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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_argzero = 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_argzero = 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_argzero = 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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