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: src/sys/geom/geom_sunlabel.c,v 1.46 2005/11/30 22:15:00 sobomax Exp $");
38
39 #include <sys/param.h>
40 #include <sys/endian.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/conf.h>
44 #include <sys/bio.h>
45 #include <sys/malloc.h>
46 #include <sys/lock.h>
47 #include <sys/mutex.h>
48 #include <sys/md5.h>
49 #include <sys/sun_disklabel.h>
50 #include <geom/geom.h>
51 #include <geom/geom_slice.h>
52 #include <machine/endian.h>
53
54 #define SUNLABEL_CLASS_NAME "SUN"
55
56 struct g_sunlabel_softc {
57 int sectorsize;
58 int nheads;
59 int nsects;
60 int nalt;
61 u_char labelsum[16];
62 };
63
64 static int
65 g_sunlabel_modify(struct g_geom *gp, struct g_sunlabel_softc *ms, u_char *sec0)
66 {
67 int i, error;
68 u_int u, v, csize;
69 struct sun_disklabel sl;
70 MD5_CTX md5sum;
71
72 error = sunlabel_dec(sec0, &sl);
73 if (error)
74 return (error);
75
76 csize = sl.sl_ntracks * sl.sl_nsectors;
77
78 for (i = 0; i < SUN_NPART; i++) {
79 v = sl.sl_part[i].sdkp_cyloffset;
80 u = sl.sl_part[i].sdkp_nsectors;
81 error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
82 ((off_t)v * csize) << 9ULL,
83 ((off_t)u) << 9ULL,
84 ms->sectorsize,
85 "%s%c", gp->name, 'a' + i);
86 if (error)
87 return (error);
88 }
89 for (i = 0; i < SUN_NPART; i++) {
90 v = sl.sl_part[i].sdkp_cyloffset;
91 u = sl.sl_part[i].sdkp_nsectors;
92 g_slice_config(gp, i, G_SLICE_CONFIG_SET,
93 ((off_t)v * csize) << 9ULL,
94 ((off_t)u) << 9ULL,
95 ms->sectorsize,
96 "%s%c", gp->name, 'a' + i);
97 }
98 ms->nalt = sl.sl_acylinders;
99 ms->nheads = sl.sl_ntracks;
100 ms->nsects = sl.sl_nsectors;
101
102 /*
103 * Calculate MD5 from the first sector and use it for avoiding
104 * recursive labels creation.
105 */
106 MD5Init(&md5sum);
107 MD5Update(&md5sum, sec0, ms->sectorsize);
108 MD5Final(ms->labelsum, &md5sum);
109
110 return (0);
111 }
112
113 static void
114 g_sunlabel_hotwrite(void *arg, int flag)
115 {
116 struct bio *bp;
117 struct g_geom *gp;
118 struct g_slicer *gsp;
119 struct g_slice *gsl;
120 struct g_sunlabel_softc *ms;
121 u_char *p;
122 int error;
123
124 KASSERT(flag != EV_CANCEL, ("g_sunlabel_hotwrite cancelled"));
125 bp = arg;
126 gp = bp->bio_to->geom;
127 gsp = gp->softc;
128 ms = gsp->softc;
129 gsl = &gsp->slices[bp->bio_to->index];
130 /*
131 * XXX: For all practical purposes, this whould be equvivalent to
132 * XXX: "p = (u_char *)bp->bio_data;" because the label is always
133 * XXX: in the first sector and we refuse sectors smaller than the
134 * XXX: label.
135 */
136 p = (u_char *)bp->bio_data - (bp->bio_offset + gsl->offset);
137
138 error = g_sunlabel_modify(gp, ms, p);
139 if (error) {
140 g_io_deliver(bp, EPERM);
141 return;
142 }
143 g_slice_finish_hot(bp);
144 }
145
146 static void
147 g_sunlabel_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp)
148 {
149 struct g_slicer *gsp;
150 struct g_sunlabel_softc *ms;
151
152 gsp = gp->softc;
153 ms = gsp->softc;
154 g_slice_dumpconf(sb, indent, gp, cp, pp);
155 if (indent == NULL) {
156 sbuf_printf(sb, " sc %u hd %u alt %u",
157 ms->nsects, ms->nheads, ms->nalt);
158 }
159 }
160
161 struct g_hh01 {
162 struct g_geom *gp;
163 struct g_sunlabel_softc *ms;
164 u_char *label;
165 int error;
166 };
167
168 static void
169 g_sunlabel_callconfig(void *arg, int flag)
170 {
171 struct g_hh01 *hp;
172
173 hp = arg;
174 hp->error = g_sunlabel_modify(hp->gp, hp->ms, hp->label);
175 if (!hp->error)
176 hp->error = g_write_data(LIST_FIRST(&hp->gp->consumer),
177 0, hp->label, SUN_SIZE);
178 }
179
180 /*
181 * NB! curthread is user process which GCTL'ed.
182 */
183 static void
184 g_sunlabel_config(struct gctl_req *req, struct g_class *mp, const char *verb)
185 {
186 u_char *label;
187 int error, i;
188 struct g_hh01 h0h0;
189 struct g_slicer *gsp;
190 struct g_geom *gp;
191 struct g_consumer *cp;
192
193 g_topology_assert();
194 gp = gctl_get_geom(req, mp, "geom");
195 if (gp == NULL)
196 return;
197 cp = LIST_FIRST(&gp->consumer);
198 gsp = gp->softc;
199 if (!strcmp(verb, "write label")) {
200 label = gctl_get_paraml(req, "label", SUN_SIZE);
201 if (label == NULL)
202 return;
203 h0h0.gp = gp;
204 h0h0.ms = gsp->softc;
205 h0h0.label = label;
206 h0h0.error = -1;
207 /* XXX: Does this reference register with our selfdestruct code ? */
208 error = g_access(cp, 1, 1, 1);
209 if (error) {
210 gctl_error(req, "could not access consumer");
211 return;
212 }
213 g_sunlabel_callconfig(&h0h0, 0);
214 g_access(cp, -1, -1, -1);
215 } else if (!strcmp(verb, "write bootcode")) {
216 label = gctl_get_paraml(req, "bootcode", SUN_BOOTSIZE);
217 if (label == NULL)
218 return;
219 /* XXX: Does this reference register with our selfdestruct code ? */
220 error = g_access(cp, 1, 1, 1);
221 if (error) {
222 gctl_error(req, "could not access consumer");
223 return;
224 }
225 for (i = 0; i < SUN_NPART; i++) {
226 if (gsp->slices[i].length <= SUN_BOOTSIZE)
227 continue;
228 g_write_data(cp,
229 gsp->slices[i].offset + SUN_SIZE, label + SUN_SIZE,
230 SUN_BOOTSIZE - SUN_SIZE);
231 }
232 g_access(cp, -1, -1, -1);
233 } else {
234 gctl_error(req, "Unknown verb parameter");
235 }
236 }
237
238 static int
239 g_sunlabel_start(struct bio *bp)
240 {
241 struct g_sunlabel_softc *mp;
242 struct g_slicer *gsp;
243
244 gsp = bp->bio_to->geom->softc;
245 mp = gsp->softc;
246 if (bp->bio_cmd == BIO_GETATTR) {
247 if (g_handleattr(bp, "SUN::labelsum", mp->labelsum,
248 sizeof(mp->labelsum)))
249 return (1);
250 }
251 return (0);
252 }
253
254 static struct g_geom *
255 g_sunlabel_taste(struct g_class *mp, struct g_provider *pp, int flags)
256 {
257 struct g_geom *gp;
258 struct g_consumer *cp;
259 struct g_sunlabel_softc *ms;
260 struct g_slicer *gsp;
261 u_char *buf, hash[16];
262 MD5_CTX md5sum;
263 int error;
264
265 g_trace(G_T_TOPOLOGY, "g_sunlabel_taste(%s,%s)", mp->name, pp->name);
266 g_topology_assert();
267 if (flags == G_TF_NORMAL &&
268 !strcmp(pp->geom->class->name, SUNLABEL_CLASS_NAME))
269 return (NULL);
270 gp = g_slice_new(mp, 8, pp, &cp, &ms, sizeof *ms, g_sunlabel_start);
271 if (gp == NULL)
272 return (NULL);
273 gsp = gp->softc;
274 do {
275 ms->sectorsize = cp->provider->sectorsize;
276 if (ms->sectorsize < 512)
277 break;
278 g_topology_unlock();
279 buf = g_read_data(cp, 0, ms->sectorsize, NULL);
280 g_topology_lock();
281 if (buf == NULL)
282 break;
283
284 /*
285 * Calculate MD5 from the first sector and use it for avoiding
286 * recursive labels creation.
287 */
288 MD5Init(&md5sum);
289 MD5Update(&md5sum, buf, ms->sectorsize);
290 MD5Final(ms->labelsum, &md5sum);
291
292 error = g_getattr("SUN::labelsum", cp, &hash);
293 if (!error && !bcmp(ms->labelsum, hash, sizeof(hash))) {
294 g_free(buf);
295 break;
296 }
297
298 g_sunlabel_modify(gp, ms, buf);
299 g_free(buf);
300
301 break;
302 } while (0);
303 g_access(cp, -1, 0, 0);
304 if (LIST_EMPTY(&gp->provider)) {
305 g_slice_spoiled(cp);
306 return (NULL);
307 }
308 g_slice_conf_hot(gp, 0, 0, SUN_SIZE,
309 G_SLICE_HOT_ALLOW, G_SLICE_HOT_DENY, G_SLICE_HOT_CALL);
310 gsp->hot = g_sunlabel_hotwrite;
311 return (gp);
312 }
313
314 static struct g_class g_sunlabel_class = {
315 .name = SUNLABEL_CLASS_NAME,
316 .version = G_VERSION,
317 .taste = g_sunlabel_taste,
318 .ctlreq = g_sunlabel_config,
319 .dumpconf = g_sunlabel_dumpconf,
320 };
321
322 DECLARE_GEOM_CLASS(g_sunlabel_class, g_sunlabel);
323
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