1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26
27
28 #include <sys/types.h>
29 #include <sys/param.h>
30 #include <sys/time.h>
31 #include <sys/cred.h>
32 #include <sys/vfs.h>
33 #include <sys/vfs_opreg.h>
34 #include <sys/gfs.h>
35 #include <sys/vnode.h>
36 #include <sys/systm.h>
37 #include <sys/errno.h>
38 #include <sys/sysmacros.h>
39 #include <fs/fs_subr.h>
40 #include <sys/contract.h>
41 #include <sys/contract_impl.h>
42 #include <sys/ctfs.h>
43 #include <sys/ctfs_impl.h>
44 #include <sys/file.h>
45
46 /*
47 * CTFS routines for the /system/contract/<type>/<ctid>/ctl vnode.
48 * CTFS routines for the /system/contract/<type>/<ctid>/status vnode.
49 */
50
51 /*
52 * ctfs_create_ctlnode
53 *
54 * If necessary, creates a ctlnode for a ctl file and inserts it into
55 * the specified cdirnode's gfs_dir_t. Returns either the existing
56 * vnode or the new one.
57 */
58 vnode_t *
59 ctfs_create_ctlnode(vnode_t *pvp)
60 {
61 ctfs_ctlnode_t *ctlnode;
62 ctfs_cdirnode_t *cdirnode = pvp->v_data;
63 vnode_t *vp;
64
65 vp = gfs_file_create(sizeof (ctfs_ctlnode_t), pvp, ctfs_ops_ctl);
66 ctlnode = vp->v_data;
67 /*
68 * We transitively have a hold on the contract through our
69 * parent directory.
70 */
71 ctlnode->ctfs_ctl_contract = cdirnode->ctfs_cn_contract;
72
73 return (vp);
74 }
75
76 /*
77 * ctfs_ctl_access - VOP_ACCESS entry point
78 *
79 * You only get to access ctl files for contracts you own or were
80 * abandoned and inherited by your containing process contract.
81 */
82 /* ARGSUSED */
83 static int
84 ctfs_ctl_access(
85 vnode_t *vp,
86 int mode,
87 int flags,
88 cred_t *cr,
89 caller_context_t *cct)
90 {
91 ctfs_ctlnode_t *ctlnode = vp->v_data;
92 contract_t *ct = ctlnode->ctfs_ctl_contract;
93
94 if (mode & (VEXEC | VREAD))
95 return (EACCES);
96
97 mutex_enter(&ct->ct_lock);
98 if ((curproc == ct->ct_owner) ||
99 (ct->ct_owner == NULL && ct->ct_regent != NULL &&
100 ct->ct_regent->ct_data == curproc->p_ct_process)) {
101 mutex_exit(&ct->ct_lock);
102 return (0);
103 }
104
105 mutex_exit(&ct->ct_lock);
106 return (EACCES);
107 }
108
109 /*
110 * ctfs_ctl_open - VOP_OPEN entry point
111 *
112 * Just checks to make sure the mode bits are set, and that the
113 * constraints imposed by ctfs_ctl_access are met.
114 */
115 static int
116 ctfs_ctl_open(vnode_t **vpp, int flag, cred_t *cr, caller_context_t *ct)
117 {
118 if (flag != (FWRITE | FOFFMAX))
119 return (EINVAL);
120
121 return (ctfs_ctl_access(*vpp, VWRITE, 0, cr, ct));
122 }
123
124 /*
125 * ctfs_ctl_common_getattr
126 * Implements functionality common to ctl and status ctfs VOP_GETATTR
127 * entry points. It assumes vp->v_data is set
128 */
129 static int
130 ctfs_ctl_common_getattr(vnode_t *vp, vattr_t *vap)
131 {
132 ctfs_ctlnode_t *ctlnode = vp->v_data;
133
134 vap->va_type = VREG;
135 vap->va_nlink = 1;
136 vap->va_size = 0;
137 vap->va_ctime = ctlnode->ctfs_ctl_contract->ct_ctime;
138 mutex_enter(&ctlnode->ctfs_ctl_contract->ct_events.ctq_lock);
139 vap->va_atime = vap->va_mtime =
140 ctlnode->ctfs_ctl_contract->ct_events.ctq_atime;
141 mutex_exit(&ctlnode->ctfs_ctl_contract->ct_events.ctq_lock);
142 ctfs_common_getattr(vp, vap);
143
144 return (0);
145 }
146
147 /*
148 * ctfs_ctl_getattr - VOP_GETATTR entry point
149 */
150 /* ARGSUSED */
151 static int
152 ctfs_ctl_getattr(vnode_t *vp, vattr_t *vap, int flags,
153 cred_t *cr, caller_context_t *ct)
154 {
155 vap->va_mode = 0222;
156
157 return (ctfs_ctl_common_getattr(vp, vap));
158 }
159
160 /*
161 * ctfs_stat_getattr - VOP_GETATTR entry point
162 */
163 /* ARGSUSED */
164 static int
165 ctfs_stat_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
166 caller_context_t *ct)
167 {
168 vap->va_mode = 0444;
169
170 return (ctfs_ctl_common_getattr(vp, vap));
171 }
172
173 /*
174 * ctfs_ctl_ioctl - VOP_IOCTL entry point
175 *
176 * All the ct_ctl_*(3contract) interfaces point here.
177 */
178 /* ARGSUSED */
179 static int
180 ctfs_ctl_ioctl(
181 vnode_t *vp,
182 int cmd,
183 intptr_t arg,
184 int flag,
185 cred_t *cr,
186 int *rvalp,
187 caller_context_t *cct)
188 {
189 ctfs_ctlnode_t *ctlnode = vp->v_data;
190 contract_t *ct = ctlnode->ctfs_ctl_contract;
191 int error = 0;
192 uint64_t event;
193 int ack;
194
195 switch (cmd) {
196 case CT_CABANDON:
197 error = contract_abandon(ct, curproc, 1);
198 break;
199
200 case CT_CACK:
201 case CT_CNACK:
202 if (copyin((void *)arg, &event, sizeof (uint64_t)))
203 return (EFAULT);
204 ack = (cmd == CT_CACK) ? CT_ACK : CT_NACK;
205 error = contract_ack(ct, event, ack);
206 break;
207
208 case CT_CNEWCT:
209 error = contract_newct(ct);
210 break;
211
212 case CT_CQREQ:
213 if (copyin((void *)arg, &event, sizeof (uint64_t)))
214 return (EFAULT);
215 error = contract_qack(ct, event);
216 break;
217
218 case CT_CADOPT:
219 error = contract_adopt(ct, curproc);
220 break;
221
222 default:
223 return (EINVAL);
224 }
225
226 return (error);
227 }
228
229 const fs_operation_def_t ctfs_tops_ctl[] = {
230 { VOPNAME_OPEN, { .vop_open = ctfs_ctl_open } },
231 { VOPNAME_CLOSE, { .vop_close = ctfs_close } },
232 { VOPNAME_IOCTL, { .vop_ioctl = ctfs_ctl_ioctl } },
233 { VOPNAME_GETATTR, { .vop_getattr = ctfs_ctl_getattr } },
234 { VOPNAME_ACCESS, { .vop_access = ctfs_ctl_access } },
235 { VOPNAME_READDIR, { .error = fs_notdir } },
236 { VOPNAME_LOOKUP, { .error = fs_notdir } },
237 { VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } },
238 { NULL, { NULL } }
239 };
240
241 /*
242 * ctfs_create_statnode
243 *
244 * If necessary, creates a ctlnode for a status file and inserts it
245 * into the specified cdirnode's gfs_dir_t. Returns either the
246 * existing vnode or the new one.
247 */
248 vnode_t *
249 ctfs_create_statnode(vnode_t *pvp)
250 {
251 vnode_t *vp;
252 ctfs_cdirnode_t *cdirnode = pvp->v_data;
253 ctfs_ctlnode_t *ctlnode;
254
255 vp = gfs_file_create(sizeof (ctfs_ctlnode_t), pvp, ctfs_ops_stat);
256 ctlnode = vp->v_data;
257 /*
258 * We transitively have a hold on the contract through our
259 * parent directory.
260 */
261 ctlnode->ctfs_ctl_contract = cdirnode->ctfs_cn_contract;
262
263 return (vp);
264 }
265
266 /*
267 * ctfs_stat_ioctl - VOP_IOCTL entry point
268 *
269 * The kernel half of ct_status_read(3contract).
270 */
271 /* ARGSUSED */
272 static int
273 ctfs_stat_ioctl(
274 vnode_t *vp,
275 int cmd,
276 intptr_t arg,
277 int flag,
278 cred_t *cr,
279 int *rvalp,
280 caller_context_t *cct)
281 {
282 ctfs_ctlnode_t *statnode = vp->v_data;
283 contract_t *ct = statnode->ctfs_ctl_contract;
284 ct_type_t *type = ct->ct_type;
285 STRUCT_DECL(ct_status, st);
286 nvlist_t *foo;
287 char *bufp = NULL;
288 size_t len;
289 model_t mdl = get_udatamodel();
290 uint_t detail;
291
292 STRUCT_INIT(st, mdl);
293
294 if (cmd != CT_SSTATUS)
295 return (EINVAL);
296
297 if (copyin((void *)arg, STRUCT_BUF(st), STRUCT_SIZE(st)))
298 return (EFAULT);
299 detail = STRUCT_FGET(st, ctst_detail);
300 if (detail == CTD_COMMON) {
301 mutex_enter(&ct->ct_lock);
302 contract_status_common(ct, VTOZONE(vp), STRUCT_BUF(st), mdl);
303 mutex_exit(&ct->ct_lock);
304 } else if (detail <= CTD_ALL) {
305 VERIFY(nvlist_alloc(&foo, NV_UNIQUE_NAME, KM_SLEEP) == 0);
306 type->ct_type_ops->contop_status(ct, VTOZONE(vp), detail, foo,
307 STRUCT_BUF(st), mdl);
308 VERIFY(nvlist_pack(foo, &bufp, &len, NV_ENCODE_NATIVE,
309 KM_SLEEP) == 0);
310 nvlist_free(foo);
311
312 if ((len <= STRUCT_FGET(st, ctst_nbytes)) &&
313 (copyout(bufp, STRUCT_FGETP(st, ctst_buffer), len) == -1)) {
314 kmem_free(bufp, len);
315 return (EFAULT);
316 }
317 kmem_free(bufp, len);
318 STRUCT_FSET(st, ctst_nbytes, len);
319 } else {
320 return (EINVAL);
321 }
322 if (copyout(STRUCT_BUF(st), (void *)arg, STRUCT_SIZE(st)))
323 return (EFAULT);
324
325 return (0);
326 }
327
328 const fs_operation_def_t ctfs_tops_stat[] = {
329 { VOPNAME_OPEN, { .vop_open = ctfs_open } },
330 { VOPNAME_CLOSE, { .vop_close = ctfs_close } },
331 { VOPNAME_IOCTL, { .vop_ioctl = ctfs_stat_ioctl } },
332 { VOPNAME_GETATTR, { .vop_getattr = ctfs_stat_getattr } },
333 { VOPNAME_ACCESS, { .vop_access = ctfs_access_readonly } },
334 { VOPNAME_READDIR, { .error = fs_notdir } },
335 { VOPNAME_LOOKUP, { .error = fs_notdir } },
336 { VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } },
337 { NULL, { NULL } }
338 };