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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;
- 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,
- };
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