1 /*
2 * linux/fs/nfsd/nfs3acl.c
3 *
4 * Process version 3 NFSACL requests.
5 *
6 * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
7 */
8
9 #include <linux/sunrpc/svc.h>
10 #include <linux/nfs3.h>
11 #include <linux/nfsd/nfsd.h>
12 #include <linux/nfsd/cache.h>
13 #include <linux/nfsd/xdr3.h>
14 #include <linux/posix_acl.h>
15 #include <linux/nfsacl.h>
16
17 #define RETURN_STATUS(st) { resp->status = (st); return (st); }
18
19 /*
20 * NULL call.
21 */
22 static __be32
23 nfsd3_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
24 {
25 return nfs_ok;
26 }
27
28 /*
29 * Get the Access and/or Default ACL of a file.
30 */
31 static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp,
32 struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
33 {
34 svc_fh *fh;
35 struct posix_acl *acl;
36 __be32 nfserr = 0;
37
38 fh = fh_copy(&resp->fh, &argp->fh);
39 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
40 if (nfserr)
41 RETURN_STATUS(nfserr);
42
43 if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
44 RETURN_STATUS(nfserr_inval);
45 resp->mask = argp->mask;
46
47 if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
48 acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
49 if (IS_ERR(acl)) {
50 int err = PTR_ERR(acl);
51
52 if (err == -ENODATA || err == -EOPNOTSUPP)
53 acl = NULL;
54 else {
55 nfserr = nfserrno(err);
56 goto fail;
57 }
58 }
59 if (acl == NULL) {
60 /* Solaris returns the inode's minimum ACL. */
61
62 struct inode *inode = fh->fh_dentry->d_inode;
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
71 acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
72 if (IS_ERR(acl)) {
73 int err = PTR_ERR(acl);
74
75 if (err == -ENODATA || err == -EOPNOTSUPP)
76 acl = NULL;
77 else {
78 nfserr = nfserrno(err);
79 goto fail;
80 }
81 }
82 resp->acl_default = acl;
83 }
84
85 /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
86 RETURN_STATUS(0);
87
88 fail:
89 posix_acl_release(resp->acl_access);
90 posix_acl_release(resp->acl_default);
91 RETURN_STATUS(nfserr);
92 }
93
94 /*
95 * Set the Access and/or Default ACL of a file.
96 */
97 static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp,
98 struct nfsd3_setaclargs *argp,
99 struct nfsd3_attrstat *resp)
100 {
101 svc_fh *fh;
102 __be32 nfserr = 0;
103
104 fh = fh_copy(&resp->fh, &argp->fh);
105 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
106
107 if (!nfserr) {
108 nfserr = nfserrno( nfsd_set_posix_acl(
109 fh, ACL_TYPE_ACCESS, argp->acl_access) );
110 }
111 if (!nfserr) {
112 nfserr = nfserrno( nfsd_set_posix_acl(
113 fh, ACL_TYPE_DEFAULT, argp->acl_default) );
114 }
115
116 /* argp->acl_{access,default} may have been allocated in
117 nfs3svc_decode_setaclargs. */
118 posix_acl_release(argp->acl_access);
119 posix_acl_release(argp->acl_default);
120 RETURN_STATUS(nfserr);
121 }
122
123 /*
124 * XDR decode functions
125 */
126 static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
127 struct nfsd3_getaclargs *args)
128 {
129 if (!(p = nfs3svc_decode_fh(p, &args->fh)))
130 return 0;
131 args->mask = ntohl(*p); p++;
132
133 return xdr_argsize_check(rqstp, p);
134 }
135
136
137 static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
138 struct nfsd3_setaclargs *args)
139 {
140 struct kvec *head = rqstp->rq_arg.head;
141 unsigned int base;
142 int n;
143
144 if (!(p = nfs3svc_decode_fh(p, &args->fh)))
145 return 0;
146 args->mask = ntohl(*p++);
147 if (args->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
148 !xdr_argsize_check(rqstp, p))
149 return 0;
150
151 base = (char *)p - (char *)head->iov_base;
152 n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
153 (args->mask & NFS_ACL) ?
154 &args->acl_access : NULL);
155 if (n > 0)
156 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
157 (args->mask & NFS_DFACL) ?
158 &args->acl_default : NULL);
159 return (n > 0);
160 }
161
162 /*
163 * XDR encode functions
164 */
165
166 /* GETACL */
167 static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
168 struct nfsd3_getaclres *resp)
169 {
170 struct dentry *dentry = resp->fh.fh_dentry;
171
172 p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
173 if (resp->status == 0 && dentry && dentry->d_inode) {
174 struct inode *inode = dentry->d_inode;
175 struct kvec *head = rqstp->rq_res.head;
176 unsigned int base;
177 int n;
178 int w;
179
180 *p++ = htonl(resp->mask);
181 if (!xdr_ressize_check(rqstp, p))
182 return 0;
183 base = (char *)p - (char *)head->iov_base;
184
185 rqstp->rq_res.page_len = w = nfsacl_size(
186 (resp->mask & NFS_ACL) ? resp->acl_access : NULL,
187 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
188 while (w > 0) {
189 if (!rqstp->rq_respages[rqstp->rq_resused++])
190 return 0;
191 w -= PAGE_SIZE;
192 }
193
194 n = nfsacl_encode(&rqstp->rq_res, base, inode,
195 resp->acl_access,
196 resp->mask & NFS_ACL, 0);
197 if (n > 0)
198 n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
199 resp->acl_default,
200 resp->mask & NFS_DFACL,
201 NFS_ACL_DEFAULT);
202 if (n <= 0)
203 return 0;
204 } else
205 if (!xdr_ressize_check(rqstp, p))
206 return 0;
207
208 return 1;
209 }
210
211 /* SETACL */
212 static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p,
213 struct nfsd3_attrstat *resp)
214 {
215 p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
216
217 return xdr_ressize_check(rqstp, p);
218 }
219
220 /*
221 * XDR release functions
222 */
223 static int nfs3svc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
224 struct nfsd3_getaclres *resp)
225 {
226 fh_put(&resp->fh);
227 posix_acl_release(resp->acl_access);
228 posix_acl_release(resp->acl_default);
229 return 1;
230 }
231
232 #define nfs3svc_decode_voidargs NULL
233 #define nfs3svc_release_void NULL
234 #define nfsd3_setaclres nfsd3_attrstat
235 #define nfsd3_voidres nfsd3_voidargs
236 struct nfsd3_voidargs { int dummy; };
237
238 #define PROC(name, argt, rest, relt, cache, respsize) \
239 { (svc_procfunc) nfsd3_proc_##name, \
240 (kxdrproc_t) nfs3svc_decode_##argt##args, \
241 (kxdrproc_t) nfs3svc_encode_##rest##res, \
242 (kxdrproc_t) nfs3svc_release_##relt, \
243 sizeof(struct nfsd3_##argt##args), \
244 sizeof(struct nfsd3_##rest##res), \
245 0, \
246 cache, \
247 respsize, \
248 }
249
250 #define ST 1 /* status*/
251 #define AT 21 /* attributes */
252 #define pAT (1+AT) /* post attributes - conditional */
253 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
254
255 static struct svc_procedure nfsd_acl_procedures3[] = {
256 PROC(null, void, void, void, RC_NOCACHE, ST),
257 PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
258 PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT),
259 };
260
261 struct svc_version nfsd_acl_version3 = {
262 .vs_vers = 3,
263 .vs_nproc = 3,
264 .vs_proc = nfsd_acl_procedures3,
265 .vs_dispatch = nfsd_dispatch,
266 .vs_xdrsize = NFS3_SVC_XDRSIZE,
267 .vs_hidden = 1,
268 };
269
270
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