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1 | /* | |
2 | * Process version 2 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 NFSDDBG_FACILITY NFSDDBG_PROC | |
16 | #define RETURN_STATUS(st) { resp->status = (st); return (st); } | |
17 | ||
18 | /* | |
19 | * NULL call. | |
20 | */ | |
21 | static __be32 | |
22 | nfsacld_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) | |
23 | { | |
24 | return nfs_ok; | |
25 | } | |
26 | ||
27 | /* | |
28 | * Get the Access and/or Default ACL of a file. | |
29 | */ | |
30 | static __be32 nfsacld_proc_getacl(struct svc_rqst * rqstp, | |
31 | struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp) | |
32 | { | |
33 | struct posix_acl *acl; | |
34 | struct inode *inode; | |
35 | svc_fh *fh; | |
36 | __be32 nfserr = 0; | |
37 | ||
38 | dprintk("nfsd: GETACL(2acl) %s\n", SVCFH_fmt(&argp->fh)); | |
39 | ||
40 | fh = fh_copy(&resp->fh, &argp->fh); | |
41 | nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP); | |
42 | if (nfserr) | |
43 | RETURN_STATUS(nfserr); | |
44 | ||
45 | inode = fh->fh_dentry->d_inode; | |
46 | ||
47 | if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT)) | |
48 | RETURN_STATUS(nfserr_inval); | |
49 | resp->mask = argp->mask; | |
50 | ||
51 | nfserr = fh_getattr(fh, &resp->stat); | |
52 | if (nfserr) | |
53 | goto fail; | |
54 | ||
55 | if (resp->mask & (NFS_ACL|NFS_ACLCNT)) { | |
56 | acl = get_acl(inode, ACL_TYPE_ACCESS); | |
57 | if (IS_ERR(acl)) { | |
58 | nfserr = nfserrno(PTR_ERR(acl)); | |
59 | goto fail; | |
60 | } | |
61 | if (acl == NULL) { | |
62 | /* Solaris returns the inode's minimum ACL. */ | |
63 | acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); | |
64 | } | |
65 | resp->acl_access = acl; | |
66 | } | |
67 | if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) { | |
68 | /* Check how Solaris handles requests for the Default ACL | |
69 | of a non-directory! */ | |
70 | acl = get_acl(inode, ACL_TYPE_DEFAULT); | |
71 | if (IS_ERR(acl)) { | |
72 | nfserr = nfserrno(PTR_ERR(acl)); | |
73 | goto fail; | |
74 | } | |
75 | resp->acl_default = acl; | |
76 | } | |
77 | ||
78 | /* resp->acl_{access,default} are released in nfssvc_release_getacl. */ | |
79 | RETURN_STATUS(0); | |
80 | ||
81 | fail: | |
82 | posix_acl_release(resp->acl_access); | |
83 | posix_acl_release(resp->acl_default); | |
84 | RETURN_STATUS(nfserr); | |
85 | } | |
86 | ||
87 | /* | |
88 | * Set the Access and/or Default ACL of a file. | |
89 | */ | |
90 | static __be32 nfsacld_proc_setacl(struct svc_rqst * rqstp, | |
91 | struct nfsd3_setaclargs *argp, | |
92 | struct nfsd_attrstat *resp) | |
93 | { | |
94 | struct inode *inode; | |
95 | svc_fh *fh; | |
96 | __be32 nfserr = 0; | |
97 | int error; | |
98 | ||
99 | dprintk("nfsd: SETACL(2acl) %s\n", SVCFH_fmt(&argp->fh)); | |
100 | ||
101 | fh = fh_copy(&resp->fh, &argp->fh); | |
102 | nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR); | |
103 | if (nfserr) | |
104 | goto out; | |
105 | ||
106 | inode = fh->fh_dentry->d_inode; | |
107 | if (!IS_POSIXACL(inode) || !inode->i_op->set_acl) { | |
108 | error = -EOPNOTSUPP; | |
109 | goto out_errno; | |
110 | } | |
111 | ||
112 | error = fh_want_write(fh); | |
113 | if (error) | |
114 | goto out_errno; | |
115 | ||
116 | error = inode->i_op->set_acl(inode, argp->acl_access, ACL_TYPE_ACCESS); | |
117 | if (error) | |
118 | goto out_drop_write; | |
119 | error = inode->i_op->set_acl(inode, argp->acl_default, | |
120 | ACL_TYPE_DEFAULT); | |
121 | if (error) | |
122 | goto out_drop_write; | |
123 | ||
124 | fh_drop_write(fh); | |
125 | ||
126 | nfserr = fh_getattr(fh, &resp->stat); | |
127 | ||
128 | out: | |
129 | /* argp->acl_{access,default} may have been allocated in | |
130 | nfssvc_decode_setaclargs. */ | |
131 | posix_acl_release(argp->acl_access); | |
132 | posix_acl_release(argp->acl_default); | |
133 | return nfserr; | |
134 | out_drop_write: | |
135 | fh_drop_write(fh); | |
136 | out_errno: | |
137 | nfserr = nfserrno(error); | |
138 | goto out; | |
139 | } | |
140 | ||
141 | /* | |
142 | * Check file attributes | |
143 | */ | |
144 | static __be32 nfsacld_proc_getattr(struct svc_rqst * rqstp, | |
145 | struct nfsd_fhandle *argp, struct nfsd_attrstat *resp) | |
146 | { | |
147 | __be32 nfserr; | |
148 | dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh)); | |
149 | ||
150 | fh_copy(&resp->fh, &argp->fh); | |
151 | nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP); | |
152 | if (nfserr) | |
153 | return nfserr; | |
154 | nfserr = fh_getattr(&resp->fh, &resp->stat); | |
155 | return nfserr; | |
156 | } | |
157 | ||
158 | /* | |
159 | * Check file access | |
160 | */ | |
161 | static __be32 nfsacld_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp, | |
162 | struct nfsd3_accessres *resp) | |
163 | { | |
164 | __be32 nfserr; | |
165 | ||
166 | dprintk("nfsd: ACCESS(2acl) %s 0x%x\n", | |
167 | SVCFH_fmt(&argp->fh), | |
168 | argp->access); | |
169 | ||
170 | fh_copy(&resp->fh, &argp->fh); | |
171 | resp->access = argp->access; | |
172 | nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL); | |
173 | if (nfserr) | |
174 | return nfserr; | |
175 | nfserr = fh_getattr(&resp->fh, &resp->stat); | |
176 | return nfserr; | |
177 | } | |
178 | ||
179 | /* | |
180 | * XDR decode functions | |
181 | */ | |
182 | static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p, | |
183 | struct nfsd3_getaclargs *argp) | |
184 | { | |
185 | p = nfs2svc_decode_fh(p, &argp->fh); | |
186 | if (!p) | |
187 | return 0; | |
188 | argp->mask = ntohl(*p); p++; | |
189 | ||
190 | return xdr_argsize_check(rqstp, p); | |
191 | } | |
192 | ||
193 | ||
194 | static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p, | |
195 | struct nfsd3_setaclargs *argp) | |
196 | { | |
197 | struct kvec *head = rqstp->rq_arg.head; | |
198 | unsigned int base; | |
199 | int n; | |
200 | ||
201 | p = nfs2svc_decode_fh(p, &argp->fh); | |
202 | if (!p) | |
203 | return 0; | |
204 | argp->mask = ntohl(*p++); | |
205 | if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) || | |
206 | !xdr_argsize_check(rqstp, p)) | |
207 | return 0; | |
208 | ||
209 | base = (char *)p - (char *)head->iov_base; | |
210 | n = nfsacl_decode(&rqstp->rq_arg, base, NULL, | |
211 | (argp->mask & NFS_ACL) ? | |
212 | &argp->acl_access : NULL); | |
213 | if (n > 0) | |
214 | n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL, | |
215 | (argp->mask & NFS_DFACL) ? | |
216 | &argp->acl_default : NULL); | |
217 | return (n > 0); | |
218 | } | |
219 | ||
220 | static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p, | |
221 | struct nfsd_fhandle *argp) | |
222 | { | |
223 | p = nfs2svc_decode_fh(p, &argp->fh); | |
224 | if (!p) | |
225 | return 0; | |
226 | return xdr_argsize_check(rqstp, p); | |
227 | } | |
228 | ||
229 | static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p, | |
230 | struct nfsd3_accessargs *argp) | |
231 | { | |
232 | p = nfs2svc_decode_fh(p, &argp->fh); | |
233 | if (!p) | |
234 | return 0; | |
235 | argp->access = ntohl(*p++); | |
236 | ||
237 | return xdr_argsize_check(rqstp, p); | |
238 | } | |
239 | ||
240 | /* | |
241 | * XDR encode functions | |
242 | */ | |
243 | ||
244 | /* | |
245 | * There must be an encoding function for void results so svc_process | |
246 | * will work properly. | |
247 | */ | |
248 | static int nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy) | |
249 | { | |
250 | return xdr_ressize_check(rqstp, p); | |
251 | } | |
252 | ||
253 | /* GETACL */ | |
254 | static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p, | |
255 | struct nfsd3_getaclres *resp) | |
256 | { | |
257 | struct dentry *dentry = resp->fh.fh_dentry; | |
258 | struct inode *inode; | |
259 | struct kvec *head = rqstp->rq_res.head; | |
260 | unsigned int base; | |
261 | int n; | |
262 | int w; | |
263 | ||
264 | /* | |
265 | * Since this is version 2, the check for nfserr in | |
266 | * nfsd_dispatch actually ensures the following cannot happen. | |
267 | * However, it seems fragile to depend on that. | |
268 | */ | |
269 | if (dentry == NULL || dentry->d_inode == NULL) | |
270 | return 0; | |
271 | inode = dentry->d_inode; | |
272 | ||
273 | p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); | |
274 | *p++ = htonl(resp->mask); | |
275 | if (!xdr_ressize_check(rqstp, p)) | |
276 | return 0; | |
277 | base = (char *)p - (char *)head->iov_base; | |
278 | ||
279 | rqstp->rq_res.page_len = w = nfsacl_size( | |
280 | (resp->mask & NFS_ACL) ? resp->acl_access : NULL, | |
281 | (resp->mask & NFS_DFACL) ? resp->acl_default : NULL); | |
282 | while (w > 0) { | |
283 | if (!*(rqstp->rq_next_page++)) | |
284 | return 0; | |
285 | w -= PAGE_SIZE; | |
286 | } | |
287 | ||
288 | n = nfsacl_encode(&rqstp->rq_res, base, inode, | |
289 | resp->acl_access, | |
290 | resp->mask & NFS_ACL, 0); | |
291 | if (n > 0) | |
292 | n = nfsacl_encode(&rqstp->rq_res, base + n, inode, | |
293 | resp->acl_default, | |
294 | resp->mask & NFS_DFACL, | |
295 | NFS_ACL_DEFAULT); | |
296 | if (n <= 0) | |
297 | return 0; | |
298 | return 1; | |
299 | } | |
300 | ||
301 | static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p, | |
302 | struct nfsd_attrstat *resp) | |
303 | { | |
304 | p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); | |
305 | return xdr_ressize_check(rqstp, p); | |
306 | } | |
307 | ||
308 | /* ACCESS */ | |
309 | static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p, | |
310 | struct nfsd3_accessres *resp) | |
311 | { | |
312 | p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); | |
313 | *p++ = htonl(resp->access); | |
314 | return xdr_ressize_check(rqstp, p); | |
315 | } | |
316 | ||
317 | /* | |
318 | * XDR release functions | |
319 | */ | |
320 | static int nfsaclsvc_release_getacl(struct svc_rqst *rqstp, __be32 *p, | |
321 | struct nfsd3_getaclres *resp) | |
322 | { | |
323 | fh_put(&resp->fh); | |
324 | posix_acl_release(resp->acl_access); | |
325 | posix_acl_release(resp->acl_default); | |
326 | return 1; | |
327 | } | |
328 | ||
329 | static int nfsaclsvc_release_attrstat(struct svc_rqst *rqstp, __be32 *p, | |
330 | struct nfsd_attrstat *resp) | |
331 | { | |
332 | fh_put(&resp->fh); | |
333 | return 1; | |
334 | } | |
335 | ||
336 | static int nfsaclsvc_release_access(struct svc_rqst *rqstp, __be32 *p, | |
337 | struct nfsd3_accessres *resp) | |
338 | { | |
339 | fh_put(&resp->fh); | |
340 | return 1; | |
341 | } | |
342 | ||
343 | #define nfsaclsvc_decode_voidargs NULL | |
344 | #define nfsaclsvc_release_void NULL | |
345 | #define nfsd3_fhandleargs nfsd_fhandle | |
346 | #define nfsd3_attrstatres nfsd_attrstat | |
347 | #define nfsd3_voidres nfsd3_voidargs | |
348 | struct nfsd3_voidargs { int dummy; }; | |
349 | ||
350 | #define PROC(name, argt, rest, relt, cache, respsize) \ | |
351 | { (svc_procfunc) nfsacld_proc_##name, \ | |
352 | (kxdrproc_t) nfsaclsvc_decode_##argt##args, \ | |
353 | (kxdrproc_t) nfsaclsvc_encode_##rest##res, \ | |
354 | (kxdrproc_t) nfsaclsvc_release_##relt, \ | |
355 | sizeof(struct nfsd3_##argt##args), \ | |
356 | sizeof(struct nfsd3_##rest##res), \ | |
357 | 0, \ | |
358 | cache, \ | |
359 | respsize, \ | |
360 | } | |
361 | ||
362 | #define ST 1 /* status*/ | |
363 | #define AT 21 /* attributes */ | |
364 | #define pAT (1+AT) /* post attributes - conditional */ | |
365 | #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */ | |
366 | ||
367 | static struct svc_procedure nfsd_acl_procedures2[] = { | |
368 | PROC(null, void, void, void, RC_NOCACHE, ST), | |
369 | PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)), | |
370 | PROC(setacl, setacl, attrstat, attrstat, RC_NOCACHE, ST+AT), | |
371 | PROC(getattr, fhandle, attrstat, attrstat, RC_NOCACHE, ST+AT), | |
372 | PROC(access, access, access, access, RC_NOCACHE, ST+AT+1), | |
373 | }; | |
374 | ||
375 | struct svc_version nfsd_acl_version2 = { | |
376 | .vs_vers = 2, | |
377 | .vs_nproc = 5, | |
378 | .vs_proc = nfsd_acl_procedures2, | |
379 | .vs_dispatch = nfsd_dispatch, | |
380 | .vs_xdrsize = NFS3_SVC_XDRSIZE, | |
381 | .vs_hidden = 0, | |
382 | }; |