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1/*
2 * Process version 3 NFSACL requests.
3 *
4 * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
5 */
6
7#include "nfsd.h"
8/* FIXME: nfsacl.h is a broken header */
9#include <linux/nfsacl.h>
10#include <linux/gfp.h>
11#include "cache.h"
12#include "xdr3.h"
13#include "vfs.h"
14
15#define RETURN_STATUS(st) { resp->status = (st); return (st); }
16
17/*
18 * NULL call.
19 */
20static __be32
21nfsd3_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
22{
23 return nfs_ok;
24}
25
26/*
27 * Get the Access and/or Default ACL of a file.
28 */
29static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp,
30 struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
31{
32 struct posix_acl *acl;
33 struct inode *inode;
34 svc_fh *fh;
35 __be32 nfserr = 0;
36
37 fh = fh_copy(&resp->fh, &argp->fh);
38 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
39 if (nfserr)
40 RETURN_STATUS(nfserr);
41
42 inode = fh->fh_dentry->d_inode;
43
44 if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
45 RETURN_STATUS(nfserr_inval);
46 resp->mask = argp->mask;
47
48 if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
49 acl = get_acl(inode, ACL_TYPE_ACCESS);
50 if (IS_ERR(acl)) {
51 nfserr = nfserrno(PTR_ERR(acl));
52 goto fail;
53 }
54 if (acl == NULL) {
55 /* Solaris returns the inode's minimum ACL. */
56 acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
57 }
58 resp->acl_access = acl;
59 }
60 if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
61 /* Check how Solaris handles requests for the Default ACL
62 of a non-directory! */
63 acl = get_acl(inode, ACL_TYPE_DEFAULT);
64 if (IS_ERR(acl)) {
65 nfserr = nfserrno(PTR_ERR(acl));
66 goto fail;
67 }
68 resp->acl_default = acl;
69 }
70
71 /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
72 RETURN_STATUS(0);
73
74fail:
75 posix_acl_release(resp->acl_access);
76 posix_acl_release(resp->acl_default);
77 RETURN_STATUS(nfserr);
78}
79
80/*
81 * Set the Access and/or Default ACL of a file.
82 */
83static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp,
84 struct nfsd3_setaclargs *argp,
85 struct nfsd3_attrstat *resp)
86{
87 struct inode *inode;
88 svc_fh *fh;
89 __be32 nfserr = 0;
90 int error;
91
92 fh = fh_copy(&resp->fh, &argp->fh);
93 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
94 if (nfserr)
95 goto out;
96
97 inode = fh->fh_dentry->d_inode;
98 if (!IS_POSIXACL(inode) || !inode->i_op->set_acl) {
99 error = -EOPNOTSUPP;
100 goto out_errno;
101 }
102
103 error = fh_want_write(fh);
104 if (error)
105 goto out_errno;
106
107 error = inode->i_op->set_acl(inode, argp->acl_access, ACL_TYPE_ACCESS);
108 if (error)
109 goto out_drop_write;
110 error = inode->i_op->set_acl(inode, argp->acl_default,
111 ACL_TYPE_DEFAULT);
112
113out_drop_write:
114 fh_drop_write(fh);
115out_errno:
116 nfserr = nfserrno(error);
117out:
118 /* argp->acl_{access,default} may have been allocated in
119 nfs3svc_decode_setaclargs. */
120 posix_acl_release(argp->acl_access);
121 posix_acl_release(argp->acl_default);
122 RETURN_STATUS(nfserr);
123}
124
125/*
126 * XDR decode functions
127 */
128static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
129 struct nfsd3_getaclargs *args)
130{
131 if (!(p = nfs3svc_decode_fh(p, &args->fh)))
132 return 0;
133 args->mask = ntohl(*p); p++;
134
135 return xdr_argsize_check(rqstp, p);
136}
137
138
139static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
140 struct nfsd3_setaclargs *args)
141{
142 struct kvec *head = rqstp->rq_arg.head;
143 unsigned int base;
144 int n;
145
146 if (!(p = nfs3svc_decode_fh(p, &args->fh)))
147 return 0;
148 args->mask = ntohl(*p++);
149 if (args->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
150 !xdr_argsize_check(rqstp, p))
151 return 0;
152
153 base = (char *)p - (char *)head->iov_base;
154 n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
155 (args->mask & NFS_ACL) ?
156 &args->acl_access : NULL);
157 if (n > 0)
158 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
159 (args->mask & NFS_DFACL) ?
160 &args->acl_default : NULL);
161 return (n > 0);
162}
163
164/*
165 * XDR encode functions
166 */
167
168/* GETACL */
169static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
170 struct nfsd3_getaclres *resp)
171{
172 struct dentry *dentry = resp->fh.fh_dentry;
173
174 p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
175 if (resp->status == 0 && dentry && dentry->d_inode) {
176 struct inode *inode = dentry->d_inode;
177 struct kvec *head = rqstp->rq_res.head;
178 unsigned int base;
179 int n;
180 int w;
181
182 *p++ = htonl(resp->mask);
183 if (!xdr_ressize_check(rqstp, p))
184 return 0;
185 base = (char *)p - (char *)head->iov_base;
186
187 rqstp->rq_res.page_len = w = nfsacl_size(
188 (resp->mask & NFS_ACL) ? resp->acl_access : NULL,
189 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
190 while (w > 0) {
191 if (!*(rqstp->rq_next_page++))
192 return 0;
193 w -= PAGE_SIZE;
194 }
195
196 n = nfsacl_encode(&rqstp->rq_res, base, inode,
197 resp->acl_access,
198 resp->mask & NFS_ACL, 0);
199 if (n > 0)
200 n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
201 resp->acl_default,
202 resp->mask & NFS_DFACL,
203 NFS_ACL_DEFAULT);
204 if (n <= 0)
205 return 0;
206 } else
207 if (!xdr_ressize_check(rqstp, p))
208 return 0;
209
210 return 1;
211}
212
213/* SETACL */
214static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p,
215 struct nfsd3_attrstat *resp)
216{
217 p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
218
219 return xdr_ressize_check(rqstp, p);
220}
221
222/*
223 * XDR release functions
224 */
225static int nfs3svc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
226 struct nfsd3_getaclres *resp)
227{
228 fh_put(&resp->fh);
229 posix_acl_release(resp->acl_access);
230 posix_acl_release(resp->acl_default);
231 return 1;
232}
233
234#define nfs3svc_decode_voidargs NULL
235#define nfs3svc_release_void NULL
236#define nfsd3_setaclres nfsd3_attrstat
237#define nfsd3_voidres nfsd3_voidargs
238struct nfsd3_voidargs { int dummy; };
239
240#define PROC(name, argt, rest, relt, cache, respsize) \
241 { (svc_procfunc) nfsd3_proc_##name, \
242 (kxdrproc_t) nfs3svc_decode_##argt##args, \
243 (kxdrproc_t) nfs3svc_encode_##rest##res, \
244 (kxdrproc_t) nfs3svc_release_##relt, \
245 sizeof(struct nfsd3_##argt##args), \
246 sizeof(struct nfsd3_##rest##res), \
247 0, \
248 cache, \
249 respsize, \
250 }
251
252#define ST 1 /* status*/
253#define AT 21 /* attributes */
254#define pAT (1+AT) /* post attributes - conditional */
255#define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
256
257static struct svc_procedure nfsd_acl_procedures3[] = {
258 PROC(null, void, void, void, RC_NOCACHE, ST),
259 PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
260 PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT),
261};
262
263struct svc_version nfsd_acl_version3 = {
264 .vs_vers = 3,
265 .vs_nproc = 3,
266 .vs_proc = nfsd_acl_procedures3,
267 .vs_dispatch = nfsd_dispatch,
268 .vs_xdrsize = NFS3_SVC_XDRSIZE,
269 .vs_hidden = 0,
270};
271
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Process version 3 NFSACL requests.
4 *
5 * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
6 */
7
8#include "nfsd.h"
9/* FIXME: nfsacl.h is a broken header */
10#include <linux/nfsacl.h>
11#include <linux/gfp.h>
12#include "cache.h"
13#include "xdr3.h"
14#include "vfs.h"
15
16/*
17 * NULL call.
18 */
19static __be32
20nfsd3_proc_null(struct svc_rqst *rqstp)
21{
22 return rpc_success;
23}
24
25/*
26 * Get the Access and/or Default ACL of a file.
27 */
28static __be32 nfsd3_proc_getacl(struct svc_rqst *rqstp)
29{
30 struct nfsd3_getaclargs *argp = rqstp->rq_argp;
31 struct nfsd3_getaclres *resp = rqstp->rq_resp;
32 struct posix_acl *acl;
33 struct inode *inode;
34 svc_fh *fh;
35
36 fh = fh_copy(&resp->fh, &argp->fh);
37 resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
38 if (resp->status != nfs_ok)
39 goto out;
40
41 inode = d_inode(fh->fh_dentry);
42
43 if (argp->mask & ~NFS_ACL_MASK) {
44 resp->status = nfserr_inval;
45 goto out;
46 }
47 resp->mask = argp->mask;
48
49 if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
50 acl = get_inode_acl(inode, ACL_TYPE_ACCESS);
51 if (acl == NULL) {
52 /* Solaris returns the inode's minimum ACL. */
53 acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
54 }
55 if (IS_ERR(acl)) {
56 resp->status = nfserrno(PTR_ERR(acl));
57 goto fail;
58 }
59 resp->acl_access = acl;
60 }
61 if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
62 /* Check how Solaris handles requests for the Default ACL
63 of a non-directory! */
64 acl = get_inode_acl(inode, ACL_TYPE_DEFAULT);
65 if (IS_ERR(acl)) {
66 resp->status = nfserrno(PTR_ERR(acl));
67 goto fail;
68 }
69 resp->acl_default = acl;
70 }
71
72 /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
73out:
74 return rpc_success;
75
76fail:
77 posix_acl_release(resp->acl_access);
78 posix_acl_release(resp->acl_default);
79 goto out;
80}
81
82/*
83 * Set the Access and/or Default ACL of a file.
84 */
85static __be32 nfsd3_proc_setacl(struct svc_rqst *rqstp)
86{
87 struct nfsd3_setaclargs *argp = rqstp->rq_argp;
88 struct nfsd3_attrstat *resp = rqstp->rq_resp;
89 struct inode *inode;
90 svc_fh *fh;
91 int error;
92
93 fh = fh_copy(&resp->fh, &argp->fh);
94 resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
95 if (resp->status != nfs_ok)
96 goto out;
97
98 inode = d_inode(fh->fh_dentry);
99
100 error = fh_want_write(fh);
101 if (error)
102 goto out_errno;
103
104 inode_lock(inode);
105
106 error = set_posix_acl(&nop_mnt_idmap, fh->fh_dentry, ACL_TYPE_ACCESS,
107 argp->acl_access);
108 if (error)
109 goto out_drop_lock;
110 error = set_posix_acl(&nop_mnt_idmap, fh->fh_dentry, ACL_TYPE_DEFAULT,
111 argp->acl_default);
112
113out_drop_lock:
114 inode_unlock(inode);
115 fh_drop_write(fh);
116out_errno:
117 resp->status = nfserrno(error);
118out:
119 /* argp->acl_{access,default} may have been allocated in
120 nfs3svc_decode_setaclargs. */
121 posix_acl_release(argp->acl_access);
122 posix_acl_release(argp->acl_default);
123 return rpc_success;
124}
125
126/*
127 * XDR decode functions
128 */
129
130static bool
131nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
132{
133 struct nfsd3_getaclargs *args = rqstp->rq_argp;
134
135 if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
136 return false;
137 if (xdr_stream_decode_u32(xdr, &args->mask) < 0)
138 return false;
139
140 return true;
141}
142
143static bool
144nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
145{
146 struct nfsd3_setaclargs *argp = rqstp->rq_argp;
147
148 if (!svcxdr_decode_nfs_fh3(xdr, &argp->fh))
149 return false;
150 if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
151 return false;
152 if (argp->mask & ~NFS_ACL_MASK)
153 return false;
154 if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_ACL) ?
155 &argp->acl_access : NULL))
156 return false;
157 if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_DFACL) ?
158 &argp->acl_default : NULL))
159 return false;
160
161 return true;
162}
163
164/*
165 * XDR encode functions
166 */
167
168/* GETACL */
169static bool
170nfs3svc_encode_getaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
171{
172 struct nfsd3_getaclres *resp = rqstp->rq_resp;
173 struct dentry *dentry = resp->fh.fh_dentry;
174 struct inode *inode;
175
176 if (!svcxdr_encode_nfsstat3(xdr, resp->status))
177 return false;
178 switch (resp->status) {
179 case nfs_ok:
180 inode = d_inode(dentry);
181 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
182 return false;
183 if (xdr_stream_encode_u32(xdr, resp->mask) < 0)
184 return false;
185
186 if (!nfs_stream_encode_acl(xdr, inode, resp->acl_access,
187 resp->mask & NFS_ACL, 0))
188 return false;
189 if (!nfs_stream_encode_acl(xdr, inode, resp->acl_default,
190 resp->mask & NFS_DFACL,
191 NFS_ACL_DEFAULT))
192 return false;
193 break;
194 default:
195 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
196 return false;
197 }
198
199 return true;
200}
201
202/* SETACL */
203static bool
204nfs3svc_encode_setaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
205{
206 struct nfsd3_attrstat *resp = rqstp->rq_resp;
207
208 return svcxdr_encode_nfsstat3(xdr, resp->status) &&
209 svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh);
210}
211
212/*
213 * XDR release functions
214 */
215static void nfs3svc_release_getacl(struct svc_rqst *rqstp)
216{
217 struct nfsd3_getaclres *resp = rqstp->rq_resp;
218
219 fh_put(&resp->fh);
220 posix_acl_release(resp->acl_access);
221 posix_acl_release(resp->acl_default);
222}
223
224struct nfsd3_voidargs { int dummy; };
225
226#define ST 1 /* status*/
227#define AT 21 /* attributes */
228#define pAT (1+AT) /* post attributes - conditional */
229#define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
230
231static const struct svc_procedure nfsd_acl_procedures3[3] = {
232 [ACLPROC3_NULL] = {
233 .pc_func = nfsd3_proc_null,
234 .pc_decode = nfssvc_decode_voidarg,
235 .pc_encode = nfssvc_encode_voidres,
236 .pc_argsize = sizeof(struct nfsd_voidargs),
237 .pc_argzero = sizeof(struct nfsd_voidargs),
238 .pc_ressize = sizeof(struct nfsd_voidres),
239 .pc_cachetype = RC_NOCACHE,
240 .pc_xdrressize = ST,
241 .pc_name = "NULL",
242 },
243 [ACLPROC3_GETACL] = {
244 .pc_func = nfsd3_proc_getacl,
245 .pc_decode = nfs3svc_decode_getaclargs,
246 .pc_encode = nfs3svc_encode_getaclres,
247 .pc_release = nfs3svc_release_getacl,
248 .pc_argsize = sizeof(struct nfsd3_getaclargs),
249 .pc_argzero = sizeof(struct nfsd3_getaclargs),
250 .pc_ressize = sizeof(struct nfsd3_getaclres),
251 .pc_cachetype = RC_NOCACHE,
252 .pc_xdrressize = ST+1+2*(1+ACL),
253 .pc_name = "GETACL",
254 },
255 [ACLPROC3_SETACL] = {
256 .pc_func = nfsd3_proc_setacl,
257 .pc_decode = nfs3svc_decode_setaclargs,
258 .pc_encode = nfs3svc_encode_setaclres,
259 .pc_release = nfs3svc_release_fhandle,
260 .pc_argsize = sizeof(struct nfsd3_setaclargs),
261 .pc_argzero = sizeof(struct nfsd3_setaclargs),
262 .pc_ressize = sizeof(struct nfsd3_attrstat),
263 .pc_cachetype = RC_NOCACHE,
264 .pc_xdrressize = ST+pAT,
265 .pc_name = "SETACL",
266 },
267};
268
269static DEFINE_PER_CPU_ALIGNED(unsigned long,
270 nfsd_acl_count3[ARRAY_SIZE(nfsd_acl_procedures3)]);
271const struct svc_version nfsd_acl_version3 = {
272 .vs_vers = 3,
273 .vs_nproc = ARRAY_SIZE(nfsd_acl_procedures3),
274 .vs_proc = nfsd_acl_procedures3,
275 .vs_count = nfsd_acl_count3,
276 .vs_dispatch = nfsd_dispatch,
277 .vs_xdrsize = NFS3_SVC_XDRSIZE,
278};
279