1 /*
2 * linux/fs/nfsd/nfs2acl.c
3 *
4 * Process version 2 NFSACL requests.
5 *
6 * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
7 */
8
9 #include <linux/sunrpc/svc.h>
10 #include <linux/nfs.h>
11 #include <linux/nfsd/nfsd.h>
12 #include <linux/nfsd/cache.h>
13 #include <linux/nfsd/xdr.h>
14 #include <linux/nfsd/xdr3.h>
15 #include <linux/posix_acl.h>
16 #include <linux/nfsacl.h>
17
18 #define NFSDDBG_FACILITY NFSDDBG_PROC
19 #define RETURN_STATUS(st) { resp->status = (st); return (st); }
20
21 /*
22 * NULL call.
23 */
24 static __be32
25 nfsacld_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
26 {
27 return nfs_ok;
28 }
29
30 /*
31 * Get the Access and/or Default ACL of a file.
32 */
33 static __be32 nfsacld_proc_getacl(struct svc_rqst * rqstp,
34 struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
35 {
36 svc_fh *fh;
37 struct posix_acl *acl;
38 __be32 nfserr = 0;
39
40 dprintk("nfsd: GETACL(2acl) %s\n", SVCFH_fmt(&argp->fh));
41
42 fh = fh_copy(&resp->fh, &argp->fh);
43 if ((nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_NOP)))
44 RETURN_STATUS(nfserr);
45
46 if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
47 RETURN_STATUS(nfserr_inval);
48 resp->mask = argp->mask;
49
50 if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
51 acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
52 if (IS_ERR(acl)) {
53 int err = PTR_ERR(acl);
54
55 if (err == -ENODATA || err == -EOPNOTSUPP)
56 acl = NULL;
57 else {
58 nfserr = nfserrno(err);
59 goto fail;
60 }
61 }
62 if (acl == NULL) {
63 /* Solaris returns the inode's minimum ACL. */
64
65 struct inode *inode = fh->fh_dentry->d_inode;
66 acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
67 }
68 resp->acl_access = acl;
69 }
70 if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
71 /* Check how Solaris handles requests for the Default ACL
72 of a non-directory! */
73
74 acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
75 if (IS_ERR(acl)) {
76 int err = PTR_ERR(acl);
77
78 if (err == -ENODATA || err == -EOPNOTSUPP)
79 acl = NULL;
80 else {
81 nfserr = nfserrno(err);
82 goto fail;
83 }
84 }
85 resp->acl_default = acl;
86 }
87
88 /* resp->acl_{access,default} are released in nfssvc_release_getacl. */
89 RETURN_STATUS(0);
90
91 fail:
92 posix_acl_release(resp->acl_access);
93 posix_acl_release(resp->acl_default);
94 RETURN_STATUS(nfserr);
95 }
96
97 /*
98 * Set the Access and/or Default ACL of a file.
99 */
100 static __be32 nfsacld_proc_setacl(struct svc_rqst * rqstp,
101 struct nfsd3_setaclargs *argp,
102 struct nfsd_attrstat *resp)
103 {
104 svc_fh *fh;
105 __be32 nfserr = 0;
106
107 dprintk("nfsd: SETACL(2acl) %s\n", SVCFH_fmt(&argp->fh));
108
109 fh = fh_copy(&resp->fh, &argp->fh);
110 nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_SATTR);
111
112 if (!nfserr) {
113 nfserr = nfserrno( nfsd_set_posix_acl(
114 fh, ACL_TYPE_ACCESS, argp->acl_access) );
115 }
116 if (!nfserr) {
117 nfserr = nfserrno( nfsd_set_posix_acl(
118 fh, ACL_TYPE_DEFAULT, argp->acl_default) );
119 }
120
121 /* argp->acl_{access,default} may have been allocated in
122 nfssvc_decode_setaclargs. */
123 posix_acl_release(argp->acl_access);
124 posix_acl_release(argp->acl_default);
125 return nfserr;
126 }
127
128 /*
129 * Check file attributes
130 */
131 static __be32 nfsacld_proc_getattr(struct svc_rqst * rqstp,
132 struct nfsd_fhandle *argp, struct nfsd_attrstat *resp)
133 {
134 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
135
136 fh_copy(&resp->fh, &argp->fh);
137 return fh_verify(rqstp, &resp->fh, 0, MAY_NOP);
138 }
139
140 /*
141 * Check file access
142 */
143 static __be32 nfsacld_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp,
144 struct nfsd3_accessres *resp)
145 {
146 __be32 nfserr;
147
148 dprintk("nfsd: ACCESS(2acl) %s 0x%x\n",
149 SVCFH_fmt(&argp->fh),
150 argp->access);
151
152 fh_copy(&resp->fh, &argp->fh);
153 resp->access = argp->access;
154 nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
155 return nfserr;
156 }
157
158 /*
159 * XDR decode functions
160 */
161 static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
162 struct nfsd3_getaclargs *argp)
163 {
164 if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
165 return 0;
166 argp->mask = ntohl(*p); p++;
167
168 return xdr_argsize_check(rqstp, p);
169 }
170
171
172 static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
173 struct nfsd3_setaclargs *argp)
174 {
175 struct kvec *head = rqstp->rq_arg.head;
176 unsigned int base;
177 int n;
178
179 if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
180 return 0;
181 argp->mask = ntohl(*p++);
182 if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
183 !xdr_argsize_check(rqstp, p))
184 return 0;
185
186 base = (char *)p - (char *)head->iov_base;
187 n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
188 (argp->mask & NFS_ACL) ?
189 &argp->acl_access : NULL);
190 if (n > 0)
191 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
192 (argp->mask & NFS_DFACL) ?
193 &argp->acl_default : NULL);
194 return (n > 0);
195 }
196
197 static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p,
198 struct nfsd_fhandle *argp)
199 {
200 if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
201 return 0;
202 return xdr_argsize_check(rqstp, p);
203 }
204
205 static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
206 struct nfsd3_accessargs *argp)
207 {
208 if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
209 return 0;
210 argp->access = ntohl(*p++);
211
212 return xdr_argsize_check(rqstp, p);
213 }
214
215 /*
216 * XDR encode functions
217 */
218
219 /* GETACL */
220 static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
221 struct nfsd3_getaclres *resp)
222 {
223 struct dentry *dentry = resp->fh.fh_dentry;
224 struct inode *inode;
225 struct kvec *head = rqstp->rq_res.head;
226 unsigned int base;
227 int n;
228 int w;
229
230 /*
231 * Since this is version 2, the check for nfserr in
232 * nfsd_dispatch actually ensures the following cannot happen.
233 * However, it seems fragile to depend on that.
234 */
235 if (dentry == NULL || dentry->d_inode == NULL)
236 return 0;
237 inode = dentry->d_inode;
238
239 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
240 *p++ = htonl(resp->mask);
241 if (!xdr_ressize_check(rqstp, p))
242 return 0;
243 base = (char *)p - (char *)head->iov_base;
244
245 rqstp->rq_res.page_len = w = nfsacl_size(
246 (resp->mask & NFS_ACL) ? resp->acl_access : NULL,
247 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
248 while (w > 0) {
249 if (!rqstp->rq_respages[rqstp->rq_resused++])
250 return 0;
251 w -= PAGE_SIZE;
252 }
253
254 n = nfsacl_encode(&rqstp->rq_res, base, inode,
255 resp->acl_access,
256 resp->mask & NFS_ACL, 0);
257 if (n > 0)
258 n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
259 resp->acl_default,
260 resp->mask & NFS_DFACL,
261 NFS_ACL_DEFAULT);
262 if (n <= 0)
263 return 0;
264 return 1;
265 }
266
267 static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p,
268 struct nfsd_attrstat *resp)
269 {
270 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
271 return xdr_ressize_check(rqstp, p);
272 }
273
274 /* ACCESS */
275 static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
276 struct nfsd3_accessres *resp)
277 {
278 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
279 *p++ = htonl(resp->access);
280 return xdr_ressize_check(rqstp, p);
281 }
282
283 /*
284 * XDR release functions
285 */
286 static int nfsaclsvc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
287 struct nfsd3_getaclres *resp)
288 {
289 fh_put(&resp->fh);
290 posix_acl_release(resp->acl_access);
291 posix_acl_release(resp->acl_default);
292 return 1;
293 }
294
295 static int nfsaclsvc_release_attrstat(struct svc_rqst *rqstp, __be32 *p,
296 struct nfsd_attrstat *resp)
297 {
298 fh_put(&resp->fh);
299 return 1;
300 }
301
302 static int nfsaclsvc_release_access(struct svc_rqst *rqstp, __be32 *p,
303 struct nfsd3_accessres *resp)
304 {
305 fh_put(&resp->fh);
306 return 1;
307 }
308
309 #define nfsaclsvc_decode_voidargs NULL
310 #define nfsaclsvc_encode_voidres NULL
311 #define nfsaclsvc_release_void NULL
312 #define nfsd3_fhandleargs nfsd_fhandle
313 #define nfsd3_attrstatres nfsd_attrstat
314 #define nfsd3_voidres nfsd3_voidargs
315 struct nfsd3_voidargs { int dummy; };
316
317 #define PROC(name, argt, rest, relt, cache, respsize) \
318 { (svc_procfunc) nfsacld_proc_##name, \
319 (kxdrproc_t) nfsaclsvc_decode_##argt##args, \
320 (kxdrproc_t) nfsaclsvc_encode_##rest##res, \
321 (kxdrproc_t) nfsaclsvc_release_##relt, \
322 sizeof(struct nfsd3_##argt##args), \
323 sizeof(struct nfsd3_##rest##res), \
324 0, \
325 cache, \
326 respsize, \
327 }
328
329 #define ST 1 /* status*/
330 #define AT 21 /* attributes */
331 #define pAT (1+AT) /* post attributes - conditional */
332 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
333
334 static struct svc_procedure nfsd_acl_procedures2[] = {
335 PROC(null, void, void, void, RC_NOCACHE, ST),
336 PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
337 PROC(setacl, setacl, attrstat, attrstat, RC_NOCACHE, ST+AT),
338 PROC(getattr, fhandle, attrstat, attrstat, RC_NOCACHE, ST+AT),
339 PROC(access, access, access, access, RC_NOCACHE, ST+AT+1),
340 };
341
342 struct svc_version nfsd_acl_version2 = {
343 .vs_vers = 2,
344 .vs_nproc = 5,
345 .vs_proc = nfsd_acl_procedures2,
346 .vs_dispatch = nfsd_dispatch,
347 .vs_xdrsize = NFS3_SVC_XDRSIZE,
348 .vs_hidden = 1,
349 };
350
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