1 /*-
2 * Copyright (c) 2002 Poul-Henning Kamp
3 * Copyright (c) 2002 Networks Associates Technology, Inc.
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp
7 * and NAI Labs, the Security Research Division of Network Associates, Inc.
8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
9 * DARPA CHATS research program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The names of the authors may not be used to endorse or promote
20 * products derived from this software without specific prior written
21 * permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38
39 #include <sys/param.h>
40 #include <sys/endian.h>
41 #include <sys/systm.h>
42 #include <sys/sysctl.h>
43 #include <sys/kernel.h>
44 #include <sys/conf.h>
45 #include <sys/bio.h>
46 #include <sys/malloc.h>
47 #include <sys/lock.h>
48 #include <sys/mutex.h>
49 #include <sys/md5.h>
50 #include <sys/sbuf.h>
51 #include <sys/sun_disklabel.h>
52 #include <geom/geom.h>
53 #include <geom/geom_slice.h>
54 #include <machine/endian.h>
55
56 FEATURE(geom_sunlabel, "GEOM Sun/Solaris partitioning support");
57
58 #define SUNLABEL_CLASS_NAME "SUN"
59
60 struct g_sunlabel_softc {
61 int sectorsize;
62 int nheads;
63 int nsects;
64 int nalt;
65 u_char labelsum[16];
66 };
67
68 static int
69 g_sunlabel_modify(struct g_geom *gp, struct g_sunlabel_softc *ms, u_char *sec0)
70 {
71 int i, error;
72 u_int u, v, csize;
73 struct sun_disklabel sl;
74 MD5_CTX md5sum;
75
76 error = sunlabel_dec(sec0, &sl);
77 if (error)
78 return (error);
79
80 csize = sl.sl_ntracks * sl.sl_nsectors;
81
82 for (i = 0; i < SUN_NPART; i++) {
83 v = sl.sl_part[i].sdkp_cyloffset;
84 u = sl.sl_part[i].sdkp_nsectors;
85 error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
86 ((off_t)v * csize) << 9ULL,
87 ((off_t)u) << 9ULL,
88 ms->sectorsize,
89 "%s%c", gp->name, 'a' + i);
90 if (error)
91 return (error);
92 }
93 for (i = 0; i < SUN_NPART; i++) {
94 v = sl.sl_part[i].sdkp_cyloffset;
95 u = sl.sl_part[i].sdkp_nsectors;
96 g_slice_config(gp, i, G_SLICE_CONFIG_SET,
97 ((off_t)v * csize) << 9ULL,
98 ((off_t)u) << 9ULL,
99 ms->sectorsize,
100 "%s%c", gp->name, 'a' + i);
101 }
102 ms->nalt = sl.sl_acylinders;
103 ms->nheads = sl.sl_ntracks;
104 ms->nsects = sl.sl_nsectors;
105
106 /*
107 * Calculate MD5 from the first sector and use it for avoiding
108 * recursive labels creation.
109 */
110 MD5Init(&md5sum);
111 MD5Update(&md5sum, sec0, ms->sectorsize);
112 MD5Final(ms->labelsum, &md5sum);
113
114 return (0);
115 }
116
117 static void
118 g_sunlabel_hotwrite(void *arg, int flag)
119 {
120 struct bio *bp;
121 struct g_geom *gp;
122 struct g_slicer *gsp;
123 struct g_slice *gsl;
124 struct g_sunlabel_softc *ms;
125 u_char *p;
126 int error;
127
128 KASSERT(flag != EV_CANCEL, ("g_sunlabel_hotwrite cancelled"));
129 bp = arg;
130 gp = bp->bio_to->geom;
131 gsp = gp->softc;
132 ms = gsp->softc;
133 gsl = &gsp->slices[bp->bio_to->index];
134 /*
135 * XXX: For all practical purposes, this whould be equvivalent to
136 * XXX: "p = (u_char *)bp->bio_data;" because the label is always
137 * XXX: in the first sector and we refuse sectors smaller than the
138 * XXX: label.
139 */
140 p = (u_char *)bp->bio_data - (bp->bio_offset + gsl->offset);
141
142 error = g_sunlabel_modify(gp, ms, p);
143 if (error) {
144 g_io_deliver(bp, EPERM);
145 return;
146 }
147 g_slice_finish_hot(bp);
148 }
149
150 static void
151 g_sunlabel_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp)
152 {
153 struct g_slicer *gsp;
154 struct g_sunlabel_softc *ms;
155
156 gsp = gp->softc;
157 ms = gsp->softc;
158 g_slice_dumpconf(sb, indent, gp, cp, pp);
159 if (indent == NULL) {
160 sbuf_printf(sb, " sc %u hd %u alt %u",
161 ms->nsects, ms->nheads, ms->nalt);
162 }
163 }
164
165 struct g_hh01 {
166 struct g_geom *gp;
167 struct g_sunlabel_softc *ms;
168 u_char *label;
169 int error;
170 };
171
172 static void
173 g_sunlabel_callconfig(void *arg, int flag)
174 {
175 struct g_hh01 *hp;
176
177 hp = arg;
178 hp->error = g_sunlabel_modify(hp->gp, hp->ms, hp->label);
179 if (!hp->error)
180 hp->error = g_write_data(LIST_FIRST(&hp->gp->consumer),
181 0, hp->label, SUN_SIZE);
182 }
183
184 /*
185 * NB! curthread is user process which GCTL'ed.
186 */
187 static void
188 g_sunlabel_config(struct gctl_req *req, struct g_class *mp, const char *verb)
189 {
190 u_char *label;
191 int error, i;
192 struct g_hh01 h0h0;
193 struct g_slicer *gsp;
194 struct g_geom *gp;
195 struct g_consumer *cp;
196
197 g_topology_assert();
198 gp = gctl_get_geom(req, mp, "geom");
199 if (gp == NULL)
200 return;
201 cp = LIST_FIRST(&gp->consumer);
202 gsp = gp->softc;
203 if (!strcmp(verb, "write label")) {
204 label = gctl_get_paraml(req, "label", SUN_SIZE);
205 if (label == NULL)
206 return;
207 h0h0.gp = gp;
208 h0h0.ms = gsp->softc;
209 h0h0.label = label;
210 h0h0.error = -1;
211 /* XXX: Does this reference register with our selfdestruct code ? */
212 error = g_access(cp, 1, 1, 1);
213 if (error) {
214 gctl_error(req, "could not access consumer");
215 return;
216 }
217 g_sunlabel_callconfig(&h0h0, 0);
218 g_access(cp, -1, -1, -1);
219 } else if (!strcmp(verb, "write bootcode")) {
220 label = gctl_get_paraml(req, "bootcode", SUN_BOOTSIZE);
221 if (label == NULL)
222 return;
223 /* XXX: Does this reference register with our selfdestruct code ? */
224 error = g_access(cp, 1, 1, 1);
225 if (error) {
226 gctl_error(req, "could not access consumer");
227 return;
228 }
229 for (i = 0; i < SUN_NPART; i++) {
230 if (gsp->slices[i].length <= SUN_BOOTSIZE)
231 continue;
232 g_write_data(cp,
233 gsp->slices[i].offset + SUN_SIZE, label + SUN_SIZE,
234 SUN_BOOTSIZE - SUN_SIZE);
235 }
236 g_access(cp, -1, -1, -1);
237 } else {
238 gctl_error(req, "Unknown verb parameter");
239 }
240 }
241
242 static int
243 g_sunlabel_start(struct bio *bp)
244 {
245 struct g_sunlabel_softc *mp;
246 struct g_slicer *gsp;
247
248 gsp = bp->bio_to->geom->softc;
249 mp = gsp->softc;
250 if (bp->bio_cmd == BIO_GETATTR) {
251 if (g_handleattr(bp, "SUN::labelsum", mp->labelsum,
252 sizeof(mp->labelsum)))
253 return (1);
254 }
255 return (0);
256 }
257
258 static struct g_geom *
259 g_sunlabel_taste(struct g_class *mp, struct g_provider *pp, int flags)
260 {
261 struct g_geom *gp;
262 struct g_consumer *cp;
263 struct g_sunlabel_softc *ms;
264 struct g_slicer *gsp;
265 u_char *buf, hash[16];
266 MD5_CTX md5sum;
267 int error;
268
269 g_trace(G_T_TOPOLOGY, "g_sunlabel_taste(%s,%s)", mp->name, pp->name);
270 g_topology_assert();
271 if (flags == G_TF_NORMAL &&
272 !strcmp(pp->geom->class->name, SUNLABEL_CLASS_NAME))
273 return (NULL);
274 gp = g_slice_new(mp, 8, pp, &cp, &ms, sizeof *ms, g_sunlabel_start);
275 if (gp == NULL)
276 return (NULL);
277 gsp = gp->softc;
278 do {
279 ms->sectorsize = cp->provider->sectorsize;
280 if (ms->sectorsize < 512)
281 break;
282 g_topology_unlock();
283 buf = g_read_data(cp, 0, ms->sectorsize, NULL);
284 g_topology_lock();
285 if (buf == NULL)
286 break;
287
288 /*
289 * Calculate MD5 from the first sector and use it for avoiding
290 * recursive labels creation.
291 */
292 MD5Init(&md5sum);
293 MD5Update(&md5sum, buf, ms->sectorsize);
294 MD5Final(ms->labelsum, &md5sum);
295
296 error = g_getattr("SUN::labelsum", cp, &hash);
297 if (!error && !bcmp(ms->labelsum, hash, sizeof(hash))) {
298 g_free(buf);
299 break;
300 }
301
302 g_sunlabel_modify(gp, ms, buf);
303 g_free(buf);
304
305 break;
306 } while (0);
307 g_access(cp, -1, 0, 0);
308 if (LIST_EMPTY(&gp->provider)) {
309 g_slice_spoiled(cp);
310 return (NULL);
311 }
312 g_slice_conf_hot(gp, 0, 0, SUN_SIZE,
313 G_SLICE_HOT_ALLOW, G_SLICE_HOT_DENY, G_SLICE_HOT_CALL);
314 gsp->hot = g_sunlabel_hotwrite;
315 return (gp);
316 }
317
318 static struct g_class g_sunlabel_class = {
319 .name = SUNLABEL_CLASS_NAME,
320 .version = G_VERSION,
321 .taste = g_sunlabel_taste,
322 .ctlreq = g_sunlabel_config,
323 .dumpconf = g_sunlabel_dumpconf,
324 };
325
326 DECLARE_GEOM_CLASS(g_sunlabel_class, g_sunlabel);
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