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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 | */ |
20 | static __be32 |
21 | nfsd3_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 | */ |
29 | static __be32 nfsd3_proc_getacl(struct svc_rqst * rqstp, |
30 | struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp) |
31 | { |
32 | svc_fh *fh; |
33 | struct posix_acl *acl; |
34 | __be32 nfserr = 0; |
35 | |
36 | fh = fh_copy(&resp->fh, &argp->fh); |
37 | nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP); |
38 | if (nfserr) |
39 | RETURN_STATUS(nfserr); |
40 | |
41 | if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT)) |
42 | RETURN_STATUS(nfserr_inval); |
43 | resp->mask = argp->mask; |
44 | |
45 | if (resp->mask & (NFS_ACL|NFS_ACLCNT)) { |
46 | acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS); |
47 | if (IS_ERR(acl)) { |
48 | int err = PTR_ERR(acl); |
49 | |
50 | if (err == -ENODATA || err == -EOPNOTSUPP) |
51 | acl = NULL; |
52 | else { |
53 | nfserr = nfserrno(err); |
54 | goto fail; |
55 | } |
56 | } |
57 | if (acl == NULL) { |
58 | /* Solaris returns the inode's minimum ACL. */ |
59 | |
60 | struct inode *inode = fh->fh_dentry->d_inode; |
61 | acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); |
62 | } |
63 | resp->acl_access = acl; |
64 | } |
65 | if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) { |
66 | /* Check how Solaris handles requests for the Default ACL |
67 | of a non-directory! */ |
68 | |
69 | acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT); |
70 | if (IS_ERR(acl)) { |
71 | int err = PTR_ERR(acl); |
72 | |
73 | if (err == -ENODATA || err == -EOPNOTSUPP) |
74 | acl = NULL; |
75 | else { |
76 | nfserr = nfserrno(err); |
77 | goto fail; |
78 | } |
79 | } |
80 | resp->acl_default = acl; |
81 | } |
82 | |
83 | /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */ |
84 | RETURN_STATUS(0); |
85 | |
86 | fail: |
87 | posix_acl_release(resp->acl_access); |
88 | posix_acl_release(resp->acl_default); |
89 | RETURN_STATUS(nfserr); |
90 | } |
91 | |
92 | /* |
93 | * Set the Access and/or Default ACL of a file. |
94 | */ |
95 | static __be32 nfsd3_proc_setacl(struct svc_rqst * rqstp, |
96 | struct nfsd3_setaclargs *argp, |
97 | struct nfsd3_attrstat *resp) |
98 | { |
99 | svc_fh *fh; |
100 | __be32 nfserr = 0; |
101 | |
102 | fh = fh_copy(&resp->fh, &argp->fh); |
103 | nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR); |
104 | |
105 | if (!nfserr) { |
106 | nfserr = nfserrno( nfsd_set_posix_acl( |
107 | fh, ACL_TYPE_ACCESS, argp->acl_access) ); |
108 | } |
109 | if (!nfserr) { |
110 | nfserr = nfserrno( nfsd_set_posix_acl( |
111 | fh, ACL_TYPE_DEFAULT, argp->acl_default) ); |
112 | } |
113 | |
114 | /* argp->acl_{access,default} may have been allocated in |
115 | nfs3svc_decode_setaclargs. */ |
116 | posix_acl_release(argp->acl_access); |
117 | posix_acl_release(argp->acl_default); |
118 | RETURN_STATUS(nfserr); |
119 | } |
120 | |
121 | /* |
122 | * XDR decode functions |
123 | */ |
124 | static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p, |
125 | struct nfsd3_getaclargs *args) |
126 | { |
127 | if (!(p = nfs3svc_decode_fh(p, &args->fh))) |
128 | return 0; |
129 | args->mask = ntohl(*p); p++; |
130 | |
131 | return xdr_argsize_check(rqstp, p); |
132 | } |
133 | |
134 | |
135 | static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p, |
136 | struct nfsd3_setaclargs *args) |
137 | { |
138 | struct kvec *head = rqstp->rq_arg.head; |
139 | unsigned int base; |
140 | int n; |
141 | |
142 | if (!(p = nfs3svc_decode_fh(p, &args->fh))) |
143 | return 0; |
144 | args->mask = ntohl(*p++); |
145 | if (args->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) || |
146 | !xdr_argsize_check(rqstp, p)) |
147 | return 0; |
148 | |
149 | base = (char *)p - (char *)head->iov_base; |
150 | n = nfsacl_decode(&rqstp->rq_arg, base, NULL, |
151 | (args->mask & NFS_ACL) ? |
152 | &args->acl_access : NULL); |
153 | if (n > 0) |
154 | n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL, |
155 | (args->mask & NFS_DFACL) ? |
156 | &args->acl_default : NULL); |
157 | return (n > 0); |
158 | } |
159 | |
160 | /* |
161 | * XDR encode functions |
162 | */ |
163 | |
164 | /* GETACL */ |
165 | static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p, |
166 | struct nfsd3_getaclres *resp) |
167 | { |
168 | struct dentry *dentry = resp->fh.fh_dentry; |
169 | |
170 | p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh); |
171 | if (resp->status == 0 && dentry && dentry->d_inode) { |
172 | struct inode *inode = dentry->d_inode; |
173 | struct kvec *head = rqstp->rq_res.head; |
174 | unsigned int base; |
175 | int n; |
176 | int w; |
177 | |
178 | *p++ = htonl(resp->mask); |
179 | if (!xdr_ressize_check(rqstp, p)) |
180 | return 0; |
181 | base = (char *)p - (char *)head->iov_base; |
182 | |
183 | rqstp->rq_res.page_len = w = nfsacl_size( |
184 | (resp->mask & NFS_ACL) ? resp->acl_access : NULL, |
185 | (resp->mask & NFS_DFACL) ? resp->acl_default : NULL); |
186 | while (w > 0) { |
187 | if (!rqstp->rq_respages[rqstp->rq_resused++]) |
188 | return 0; |
189 | w -= PAGE_SIZE; |
190 | } |
191 | |
192 | n = nfsacl_encode(&rqstp->rq_res, base, inode, |
193 | resp->acl_access, |
194 | resp->mask & NFS_ACL, 0); |
195 | if (n > 0) |
196 | n = nfsacl_encode(&rqstp->rq_res, base + n, inode, |
197 | resp->acl_default, |
198 | resp->mask & NFS_DFACL, |
199 | NFS_ACL_DEFAULT); |
200 | if (n <= 0) |
201 | return 0; |
202 | } else |
203 | if (!xdr_ressize_check(rqstp, p)) |
204 | return 0; |
205 | |
206 | return 1; |
207 | } |
208 | |
209 | /* SETACL */ |
210 | static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p, |
211 | struct nfsd3_attrstat *resp) |
212 | { |
213 | p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh); |
214 | |
215 | return xdr_ressize_check(rqstp, p); |
216 | } |
217 | |
218 | /* |
219 | * XDR release functions |
220 | */ |
221 | static int nfs3svc_release_getacl(struct svc_rqst *rqstp, __be32 *p, |
222 | struct nfsd3_getaclres *resp) |
223 | { |
224 | fh_put(&resp->fh); |
225 | posix_acl_release(resp->acl_access); |
226 | posix_acl_release(resp->acl_default); |
227 | return 1; |
228 | } |
229 | |
230 | #define nfs3svc_decode_voidargs NULL |
231 | #define nfs3svc_release_void NULL |
232 | #define nfsd3_setaclres nfsd3_attrstat |
233 | #define nfsd3_voidres nfsd3_voidargs |
234 | struct nfsd3_voidargs { int dummy; }; |
235 | |
236 | #define PROC(name, argt, rest, relt, cache, respsize) \ |
237 | { (svc_procfunc) nfsd3_proc_##name, \ |
238 | (kxdrproc_t) nfs3svc_decode_##argt##args, \ |
239 | (kxdrproc_t) nfs3svc_encode_##rest##res, \ |
240 | (kxdrproc_t) nfs3svc_release_##relt, \ |
241 | sizeof(struct nfsd3_##argt##args), \ |
242 | sizeof(struct nfsd3_##rest##res), \ |
243 | 0, \ |
244 | cache, \ |
245 | respsize, \ |
246 | } |
247 | |
248 | #define ST 1 /* status*/ |
249 | #define AT 21 /* attributes */ |
250 | #define pAT (1+AT) /* post attributes - conditional */ |
251 | #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */ |
252 | |
253 | static struct svc_procedure nfsd_acl_procedures3[] = { |
254 | PROC(null, void, void, void, RC_NOCACHE, ST), |
255 | PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)), |
256 | PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT), |
257 | }; |
258 | |
259 | struct svc_version nfsd_acl_version3 = { |
260 | .vs_vers = 3, |
261 | .vs_nproc = 3, |
262 | .vs_proc = nfsd_acl_procedures3, |
263 | .vs_dispatch = nfsd_dispatch, |
264 | .vs_xdrsize = NFS3_SVC_XDRSIZE, |
265 | .vs_hidden = 0, |
266 | }; |
267 | |
268 |
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