The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/geom/bde/g_bde.c

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    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  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  * $FreeBSD: releng/7.4/sys/geom/bde/g_bde.c 143418 2005-03-11 15:42:51Z ume $
   33  *
   34  */
   35 
   36 #include <sys/param.h>
   37 #include <sys/bio.h>
   38 #include <sys/lock.h>
   39 #include <sys/mutex.h>
   40 #include <sys/malloc.h>
   41 #include <sys/systm.h>
   42 #include <sys/kernel.h>
   43 #include <sys/kthread.h>
   44 
   45 #include <crypto/rijndael/rijndael-api-fst.h>
   46 #include <crypto/sha2/sha2.h>
   47 #include <geom/geom.h>
   48 #include <geom/bde/g_bde.h>
   49 #define BDE_CLASS_NAME "BDE"
   50 
   51 static void
   52 g_bde_start(struct bio *bp)
   53 {
   54 
   55         switch (bp->bio_cmd) {
   56         case BIO_DELETE:
   57         case BIO_READ:
   58         case BIO_WRITE:
   59                 g_bde_start1(bp);
   60                 break;
   61         case BIO_GETATTR:
   62                 g_io_deliver(bp, EOPNOTSUPP);
   63                 break;
   64         default:
   65                 g_io_deliver(bp, EOPNOTSUPP);
   66                 return;
   67         }
   68         return;
   69 }
   70 
   71 static void
   72 g_bde_orphan(struct g_consumer *cp)
   73 {
   74         struct g_geom *gp;
   75         struct g_provider *pp;
   76         struct g_bde_softc *sc;
   77         int error;
   78 
   79         g_trace(G_T_TOPOLOGY, "g_bde_orphan(%p/%s)", cp, cp->provider->name);
   80         g_topology_assert();
   81         KASSERT(cp->provider->error != 0,
   82                 ("g_bde_orphan with error == 0"));
   83 
   84         gp = cp->geom;
   85         sc = gp->softc;
   86         gp->flags |= G_GEOM_WITHER;
   87         error = cp->provider->error;
   88         LIST_FOREACH(pp, &gp->provider, provider)
   89                 g_orphan_provider(pp, error);
   90         bzero(sc, sizeof(struct g_bde_softc));  /* destroy evidence */
   91         return;
   92 }
   93 
   94 static int
   95 g_bde_access(struct g_provider *pp, int dr, int dw, int de)
   96 {
   97         struct g_geom *gp;
   98         struct g_consumer *cp;
   99 
  100         gp = pp->geom;
  101         cp = LIST_FIRST(&gp->consumer);
  102         if (cp->acr == 0 && cp->acw == 0 && cp->ace == 0) {
  103                 de++;
  104                 dr++;
  105         }
  106         /* ... and let go of it on last close */
  107         if ((cp->acr + dr) == 0 && (cp->acw + dw) == 0 && (cp->ace + de) == 1) {
  108                 de--;
  109                 dr--;
  110         }
  111         return (g_access(cp, dr, dw, de));
  112 }
  113 
  114 static void
  115 g_bde_create_geom(struct gctl_req *req, struct g_class *mp, struct g_provider *pp)
  116 {
  117         struct g_geom *gp;
  118         struct g_consumer *cp;
  119         struct g_bde_key *kp;
  120         int error, i;
  121         u_int sectorsize;
  122         off_t mediasize;
  123         struct g_bde_softc *sc;
  124         void *pass;
  125         void *key;
  126 
  127         g_trace(G_T_TOPOLOGY, "g_bde_create_geom(%s, %s)", mp->name, pp->name);
  128         g_topology_assert();
  129         gp = NULL;
  130 
  131 
  132         gp = g_new_geomf(mp, "%s.bde", pp->name);
  133         cp = g_new_consumer(gp);
  134         g_attach(cp, pp);
  135         error = g_access(cp, 1, 1, 1);
  136         if (error) {
  137                 g_detach(cp);
  138                 g_destroy_consumer(cp);
  139                 g_destroy_geom(gp);
  140                 gctl_error(req, "could not access consumer");
  141                 return;
  142         }
  143         pass = NULL;
  144         key = NULL;
  145         do {
  146                 pass = gctl_get_param(req, "pass", &i);
  147                 if (pass == NULL || i != SHA512_DIGEST_LENGTH) {
  148                         gctl_error(req, "No usable key presented");
  149                         break;
  150                 }
  151                 key = gctl_get_param(req, "key", &i);
  152                 if (key != NULL && i != 16) {
  153                         gctl_error(req, "Invalid key presented");
  154                         break;
  155                 }
  156                 sectorsize = cp->provider->sectorsize;
  157                 mediasize = cp->provider->mediasize;
  158                 sc = g_malloc(sizeof(struct g_bde_softc), M_WAITOK | M_ZERO);
  159                 gp->softc = sc;
  160                 sc->geom = gp;
  161                 sc->consumer = cp;
  162 
  163                 error = g_bde_decrypt_lock(sc, pass, key,
  164                     mediasize, sectorsize, NULL);
  165                 bzero(sc->sha2, sizeof sc->sha2);
  166                 if (error)
  167                         break;
  168                 kp = &sc->key;
  169 
  170                 /* Initialize helper-fields */
  171                 kp->keys_per_sector = kp->sectorsize / G_BDE_SKEYLEN;
  172                 kp->zone_cont = kp->keys_per_sector * kp->sectorsize;
  173                 kp->zone_width = kp->zone_cont + kp->sectorsize;
  174                 kp->media_width = kp->sectorN - kp->sector0 -
  175                     G_BDE_MAXKEYS * kp->sectorsize;
  176 
  177                 /* Our external parameters */
  178                 sc->zone_cont = kp->zone_cont;
  179                 sc->mediasize = g_bde_max_sector(kp);
  180                 sc->sectorsize = kp->sectorsize;
  181 
  182                 TAILQ_INIT(&sc->freelist);
  183                 TAILQ_INIT(&sc->worklist);
  184                 mtx_init(&sc->worklist_mutex, "g_bde_worklist", NULL, MTX_DEF);
  185                 /* XXX: error check */
  186                 kthread_create(g_bde_worker, gp, &sc->thread, 0, 0,
  187                         "g_bde %s", gp->name);
  188                 pp = g_new_providerf(gp, gp->name);
  189 #if 0
  190                 /*
  191                  * XXX: Disable this for now.  Appearantly UFS no longer
  192                  * XXX: issues BIO_DELETE requests correctly, with the obvious
  193                  * XXX: outcome that userdata is trashed.
  194                  */
  195                 pp->flags |= G_PF_CANDELETE;
  196 #endif
  197                 pp->stripesize = kp->zone_cont;
  198                 pp->stripeoffset = 0;
  199                 pp->mediasize = sc->mediasize;
  200                 pp->sectorsize = sc->sectorsize;
  201                 g_error_provider(pp, 0);
  202                 break;
  203         } while (0);
  204         if (pass != NULL)
  205                 bzero(pass, SHA512_DIGEST_LENGTH);
  206         if (key != NULL)
  207                 bzero(key, 16);
  208         if (error == 0)
  209                 return;
  210         g_access(cp, -1, -1, -1);
  211         g_detach(cp);
  212         g_destroy_consumer(cp);
  213         if (gp->softc != NULL)
  214                 g_free(gp->softc);
  215         g_destroy_geom(gp);
  216         return;
  217 }
  218 
  219 
  220 static int
  221 g_bde_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
  222 {
  223         struct g_consumer *cp;
  224         struct g_provider *pp;
  225         struct g_bde_softc *sc;
  226 
  227         g_trace(G_T_TOPOLOGY, "g_bde_destroy_geom(%s, %s)", mp->name, gp->name);
  228         g_topology_assert();
  229         /*
  230          * Orderly detachment.
  231          */
  232         KASSERT(gp != NULL, ("NULL geom"));
  233         pp = LIST_FIRST(&gp->provider);
  234         KASSERT(pp != NULL, ("NULL provider"));
  235         if (pp->acr > 0 || pp->acw > 0 || pp->ace > 0)
  236                 return (EBUSY);
  237         sc = gp->softc;
  238         cp = LIST_FIRST(&gp->consumer);
  239         KASSERT(cp != NULL, ("NULL consumer"));
  240         sc->dead = 1;
  241         wakeup(sc);
  242         g_access(cp, -1, -1, -1);
  243         g_detach(cp);
  244         g_destroy_consumer(cp);
  245         while (sc->dead != 2 && !LIST_EMPTY(&pp->consumers))
  246                 tsleep(sc, PRIBIO, "g_bdedie", hz);
  247         mtx_destroy(&sc->worklist_mutex);
  248         bzero(&sc->key, sizeof sc->key);
  249         g_free(sc);
  250         g_wither_geom(gp, ENXIO);
  251         return (0);
  252 }
  253 
  254 static void
  255 g_bde_ctlreq(struct gctl_req *req, struct g_class *mp, char const *verb)
  256 {
  257         struct g_geom *gp;
  258         struct g_provider *pp;
  259 
  260         if (!strcmp(verb, "create geom")) {
  261                 pp = gctl_get_provider(req, "provider");
  262                 if (pp != NULL)
  263                         g_bde_create_geom(req, mp, pp);
  264         } else if (!strcmp(verb, "destroy geom")) {
  265                 gp = gctl_get_geom(req, mp, "geom");
  266                 if (gp != NULL)
  267                         g_bde_destroy_geom(req, mp, gp);
  268         } else {
  269                 gctl_error(req, "unknown verb");
  270         }
  271 }
  272 
  273 static struct g_class g_bde_class       = {
  274         .name = BDE_CLASS_NAME,
  275         .version = G_VERSION,
  276         .destroy_geom = g_bde_destroy_geom,
  277         .ctlreq = g_bde_ctlreq,
  278         .start = g_bde_start,
  279         .orphan = g_bde_orphan,
  280         .access = g_bde_access,
  281         .spoiled = g_std_spoiled,
  282 };
  283 
  284 DECLARE_GEOM_CLASS(g_bde_class, g_bde);

Cache object: d7ddced1090080774cf62053857df430


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