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/geom_ctl.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  * 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: stable/11/sys/geom/geom_ctl.c 298698 2016-04-27 15:10:40Z pfg $");
   38 
   39 #include "opt_geom.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/kernel.h>
   44 #include <sys/sysctl.h>
   45 #include <sys/bio.h>
   46 #include <sys/conf.h>
   47 #include <sys/disk.h>
   48 #include <sys/malloc.h>
   49 #include <sys/sysctl.h>
   50 #include <sys/sbuf.h>
   51 
   52 #include <sys/lock.h>
   53 #include <sys/mutex.h>
   54 
   55 #include <vm/vm.h>
   56 #include <vm/vm_extern.h>
   57 
   58 #include <geom/geom.h>
   59 #include <geom/geom_int.h>
   60 #define GCTL_TABLE 1
   61 #include <geom/geom_ctl.h>
   62 
   63 #include <machine/stdarg.h>
   64 
   65 static d_ioctl_t g_ctl_ioctl;
   66 
   67 static struct cdevsw g_ctl_cdevsw = {
   68         .d_version =    D_VERSION,
   69         .d_flags =      D_NEEDGIANT,
   70         .d_ioctl =      g_ctl_ioctl,
   71         .d_name =       "g_ctl",
   72 };
   73 
   74 void
   75 g_ctl_init(void)
   76 {
   77 
   78         make_dev_credf(MAKEDEV_ETERNAL, &g_ctl_cdevsw, 0, NULL,
   79             UID_ROOT, GID_OPERATOR, 0640, PATH_GEOM_CTL);
   80         KASSERT(GCTL_PARAM_RD == VM_PROT_READ,
   81                 ("GCTL_PARAM_RD != VM_PROT_READ"));
   82         KASSERT(GCTL_PARAM_WR == VM_PROT_WRITE,
   83                 ("GCTL_PARAM_WR != VM_PROT_WRITE"));
   84 }
   85 
   86 /*
   87  * Report an error back to the user in ascii format.  Return nerror
   88  * or EINVAL if nerror isn't specified.
   89  */
   90 int
   91 gctl_error(struct gctl_req *req, const char *fmt, ...)
   92 {
   93         va_list ap;
   94 
   95         if (req == NULL)
   96                 return (EINVAL);
   97 
   98         /* We only record the first error */
   99         if (sbuf_done(req->serror)) {
  100                 if (!req->nerror)
  101                         req->nerror = EEXIST;
  102                 return (req->nerror);
  103         }
  104         if (!req->nerror)
  105                 req->nerror = EINVAL;
  106 
  107         va_start(ap, fmt);
  108         sbuf_vprintf(req->serror, fmt, ap);
  109         va_end(ap);
  110         sbuf_finish(req->serror);
  111         if (g_debugflags & G_F_CTLDUMP)
  112                 printf("gctl %p error \"%s\"\n", req, sbuf_data(req->serror));
  113         return (req->nerror);
  114 }
  115 
  116 /*
  117  * Allocate space and copyin() something.
  118  * XXX: this should really be a standard function in the kernel.
  119  */
  120 static void *
  121 geom_alloc_copyin(struct gctl_req *req, void *uaddr, size_t len)
  122 {
  123         void *ptr;
  124 
  125         ptr = g_malloc(len, M_WAITOK);
  126         req->nerror = copyin(uaddr, ptr, len);
  127         if (!req->nerror)
  128                 return (ptr);
  129         g_free(ptr);
  130         return (NULL);
  131 }
  132 
  133 static void
  134 gctl_copyin(struct gctl_req *req)
  135 {
  136         struct gctl_req_arg *ap;
  137         char *p;
  138         u_int i;
  139 
  140         ap = geom_alloc_copyin(req, req->arg, req->narg * sizeof(*ap));
  141         if (ap == NULL) {
  142                 gctl_error(req, "bad control request");
  143                 req->arg = NULL;
  144                 return;
  145         }
  146 
  147         /* Nothing have been copyin()'ed yet */
  148         for (i = 0; i < req->narg; i++) {
  149                 ap[i].flag &= ~(GCTL_PARAM_NAMEKERNEL|GCTL_PARAM_VALUEKERNEL);
  150                 ap[i].flag &= ~GCTL_PARAM_CHANGED;
  151                 ap[i].kvalue = NULL;
  152         }
  153 
  154         for (i = 0; i < req->narg; i++) {
  155                 if (ap[i].nlen < 1 || ap[i].nlen > SPECNAMELEN) {
  156                         gctl_error(req,
  157                             "wrong param name length %d: %d", i, ap[i].nlen);
  158                         break;
  159                 }
  160                 p = geom_alloc_copyin(req, ap[i].name, ap[i].nlen);
  161                 if (p == NULL)
  162                         break;
  163                 if (p[ap[i].nlen - 1] != '\0') {
  164                         gctl_error(req, "unterminated param name");
  165                         g_free(p);
  166                         break;
  167                 }
  168                 ap[i].name = p;
  169                 ap[i].flag |= GCTL_PARAM_NAMEKERNEL;
  170                 if (ap[i].len <= 0) {
  171                         gctl_error(req, "negative param length");
  172                         break;
  173                 }
  174                 p = geom_alloc_copyin(req, ap[i].value, ap[i].len);
  175                 if (p == NULL)
  176                         break;
  177                 if ((ap[i].flag & GCTL_PARAM_ASCII) &&
  178                     p[ap[i].len - 1] != '\0') {
  179                         gctl_error(req, "unterminated param value");
  180                         g_free(p);
  181                         break;
  182                 }
  183                 ap[i].kvalue = p;
  184                 ap[i].flag |= GCTL_PARAM_VALUEKERNEL;
  185         }
  186         req->arg = ap;
  187         return;
  188 }
  189 
  190 static void
  191 gctl_copyout(struct gctl_req *req)
  192 {
  193         int error, i;
  194         struct gctl_req_arg *ap;
  195 
  196         if (req->nerror)
  197                 return;
  198         error = 0;
  199         ap = req->arg;
  200         for (i = 0; i < req->narg; i++, ap++) {
  201                 if (!(ap->flag & GCTL_PARAM_CHANGED))
  202                         continue;
  203                 error = copyout(ap->kvalue, ap->value, ap->len);
  204                 if (!error)
  205                         continue;
  206                 req->nerror = error;
  207                 return;
  208         }
  209         return;
  210 }
  211 
  212 static void
  213 gctl_free(struct gctl_req *req)
  214 {
  215         u_int i;
  216 
  217         sbuf_delete(req->serror);
  218         if (req->arg == NULL)
  219                 return;
  220         for (i = 0; i < req->narg; i++) {
  221                 if (req->arg[i].flag & GCTL_PARAM_NAMEKERNEL)
  222                         g_free(req->arg[i].name);
  223                 if ((req->arg[i].flag & GCTL_PARAM_VALUEKERNEL) &&
  224                     req->arg[i].len > 0)
  225                         g_free(req->arg[i].kvalue);
  226         }
  227         g_free(req->arg);
  228 }
  229 
  230 static void
  231 gctl_dump(struct gctl_req *req)
  232 {
  233         struct gctl_req_arg *ap;
  234         u_int i;
  235         int j;
  236 
  237         printf("Dump of gctl request at %p:\n", req);
  238         if (req->nerror > 0) {
  239                 printf("  nerror:\t%d\n", req->nerror);
  240                 if (sbuf_len(req->serror) > 0)
  241                         printf("  error:\t\"%s\"\n", sbuf_data(req->serror));
  242         }
  243         if (req->arg == NULL)
  244                 return;
  245         for (i = 0; i < req->narg; i++) {
  246                 ap = &req->arg[i];
  247                 if (!(ap->flag & GCTL_PARAM_NAMEKERNEL))
  248                         printf("  param:\t%d@%p", ap->nlen, ap->name);
  249                 else
  250                         printf("  param:\t\"%s\"", ap->name);
  251                 printf(" [%s%s%d] = ",
  252                     ap->flag & GCTL_PARAM_RD ? "R" : "",
  253                     ap->flag & GCTL_PARAM_WR ? "W" : "",
  254                     ap->len);
  255                 if (!(ap->flag & GCTL_PARAM_VALUEKERNEL)) {
  256                         printf(" =@ %p", ap->value);
  257                 } else if (ap->flag & GCTL_PARAM_ASCII) {
  258                         printf("\"%s\"", (char *)ap->kvalue);
  259                 } else if (ap->len > 0) {
  260                         for (j = 0; j < ap->len && j < 512; j++)
  261                                 printf(" %02x", ((u_char *)ap->kvalue)[j]);
  262                 } else {
  263                         printf(" = %p", ap->kvalue);
  264                 }
  265                 printf("\n");
  266         }
  267 }
  268 
  269 int
  270 gctl_set_param(struct gctl_req *req, const char *param, void const *ptr,
  271     int len)
  272 {
  273         u_int i;
  274         struct gctl_req_arg *ap;
  275 
  276         for (i = 0; i < req->narg; i++) {
  277                 ap = &req->arg[i];
  278                 if (strcmp(param, ap->name))
  279                         continue;
  280                 if (!(ap->flag & GCTL_PARAM_WR))
  281                         return (EPERM);
  282                 ap->flag |= GCTL_PARAM_CHANGED;
  283                 if (ap->len < len) {
  284                         bcopy(ptr, ap->kvalue, ap->len);
  285                         return (ENOSPC);
  286                 }
  287                 bcopy(ptr, ap->kvalue, len);
  288                 return (0);
  289         }
  290         return (EINVAL);
  291 }
  292 
  293 void
  294 gctl_set_param_err(struct gctl_req *req, const char *param, void const *ptr,
  295     int len)
  296 {
  297 
  298         switch (gctl_set_param(req, param, ptr, len)) {
  299         case EPERM:
  300                 gctl_error(req, "No write access %s argument", param);
  301                 break;
  302         case ENOSPC:
  303                 gctl_error(req, "Wrong length %s argument", param);
  304                 break;
  305         case EINVAL:
  306                 gctl_error(req, "Missing %s argument", param);
  307                 break;
  308         }
  309 }
  310 
  311 void *
  312 gctl_get_param(struct gctl_req *req, const char *param, int *len)
  313 {
  314         u_int i;
  315         void *p;
  316         struct gctl_req_arg *ap;
  317 
  318         for (i = 0; i < req->narg; i++) {
  319                 ap = &req->arg[i];
  320                 if (strcmp(param, ap->name))
  321                         continue;
  322                 if (!(ap->flag & GCTL_PARAM_RD))
  323                         continue;
  324                 p = ap->kvalue;
  325                 if (len != NULL)
  326                         *len = ap->len;
  327                 return (p);
  328         }
  329         return (NULL);
  330 }
  331 
  332 char const *
  333 gctl_get_asciiparam(struct gctl_req *req, const char *param)
  334 {
  335         u_int i;
  336         char const *p;
  337         struct gctl_req_arg *ap;
  338 
  339         for (i = 0; i < req->narg; i++) {
  340                 ap = &req->arg[i];
  341                 if (strcmp(param, ap->name))
  342                         continue;
  343                 if (!(ap->flag & GCTL_PARAM_RD))
  344                         continue;
  345                 p = ap->kvalue;
  346                 if (ap->len < 1) {
  347                         gctl_error(req, "No length argument (%s)", param);
  348                         return (NULL);
  349                 }
  350                 if (p[ap->len - 1] != '\0') {
  351                         gctl_error(req, "Unterminated argument (%s)", param);
  352                         return (NULL);
  353                 }
  354                 return (p);
  355         }
  356         return (NULL);
  357 }
  358 
  359 void *
  360 gctl_get_paraml(struct gctl_req *req, const char *param, int len)
  361 {
  362         int i;
  363         void *p;
  364 
  365         p = gctl_get_param(req, param, &i);
  366         if (p == NULL)
  367                 gctl_error(req, "Missing %s argument", param);
  368         else if (i != len) {
  369                 p = NULL;
  370                 gctl_error(req, "Wrong length %s argument", param);
  371         }
  372         return (p);
  373 }
  374 
  375 struct g_class *
  376 gctl_get_class(struct gctl_req *req, char const *arg)
  377 {
  378         char const *p;
  379         struct g_class *cp;
  380 
  381         p = gctl_get_asciiparam(req, arg);
  382         if (p == NULL)
  383                 return (NULL);
  384         LIST_FOREACH(cp, &g_classes, class) {
  385                 if (!strcmp(p, cp->name))
  386                         return (cp);
  387         }
  388         return (NULL);
  389 }
  390 
  391 struct g_geom *
  392 gctl_get_geom(struct gctl_req *req, struct g_class *mpr, char const *arg)
  393 {
  394         char const *p;
  395         struct g_class *mp;
  396         struct g_geom *gp;
  397 
  398         p = gctl_get_asciiparam(req, arg);
  399         if (p == NULL)
  400                 return (NULL);
  401         LIST_FOREACH(mp, &g_classes, class) {
  402                 if (mpr != NULL && mpr != mp)
  403                         continue;
  404                 LIST_FOREACH(gp, &mp->geom, geom) {
  405                         if (!strcmp(p, gp->name))
  406                                 return (gp);
  407                 }
  408         }
  409         gctl_error(req, "Geom not found: \"%s\"", p);
  410         return (NULL);
  411 }
  412 
  413 struct g_provider *
  414 gctl_get_provider(struct gctl_req *req, char const *arg)
  415 {
  416         char const *p;
  417         struct g_provider *pp;
  418 
  419         p = gctl_get_asciiparam(req, arg);
  420         if (p == NULL)
  421                 return (NULL);
  422         pp = g_provider_by_name(p);
  423         if (pp != NULL)
  424                 return (pp);
  425         gctl_error(req, "Provider not found: \"%s\"", p);
  426         return (NULL);
  427 }
  428 
  429 static void
  430 g_ctl_req(void *arg, int flag __unused)
  431 {
  432         struct g_class *mp;
  433         struct gctl_req *req;
  434         char const *verb;
  435 
  436         g_topology_assert();
  437         req = arg;
  438         mp = gctl_get_class(req, "class");
  439         if (mp == NULL) {
  440                 gctl_error(req, "Class not found");
  441                 return;
  442         }
  443         if (mp->ctlreq == NULL) {
  444                 gctl_error(req, "Class takes no requests");
  445                 return;
  446         }
  447         verb = gctl_get_param(req, "verb", NULL);
  448         if (verb == NULL) {
  449                 gctl_error(req, "Verb missing");
  450                 return;
  451         }
  452         mp->ctlreq(req, mp, verb);
  453         g_topology_assert();
  454 }
  455 
  456 
  457 static int
  458 g_ctl_ioctl_ctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
  459 {
  460         struct gctl_req *req;
  461         int nerror;
  462 
  463         req = (void *)data;
  464         req->nerror = 0;
  465         /* It is an error if we cannot return an error text */
  466         if (req->lerror < 2)
  467                 return (EINVAL);
  468         if (!useracc(req->error, req->lerror, VM_PROT_WRITE))
  469                 return (EINVAL);
  470 
  471         req->serror = sbuf_new_auto();
  472         /* Check the version */
  473         if (req->version != GCTL_VERSION) {
  474                 gctl_error(req, "kernel and libgeom version mismatch.");
  475                 req->arg = NULL;
  476         } else {
  477                 /* Get things on board */
  478                 gctl_copyin(req);
  479 
  480                 if (g_debugflags & G_F_CTLDUMP)
  481                         gctl_dump(req);
  482 
  483                 if (!req->nerror) {
  484                         g_waitfor_event(g_ctl_req, req, M_WAITOK, NULL);
  485                         gctl_copyout(req);
  486                 }
  487         }
  488         if (sbuf_done(req->serror)) {
  489                 copyout(sbuf_data(req->serror), req->error,
  490                     imin(req->lerror, sbuf_len(req->serror) + 1));
  491         }
  492 
  493         nerror = req->nerror;
  494         gctl_free(req);
  495         return (nerror);
  496 }
  497 
  498 static int
  499 g_ctl_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
  500 {
  501         int error;
  502 
  503         switch(cmd) {
  504         case GEOM_CTL:
  505                 error = g_ctl_ioctl_ctl(dev, cmd, data, fflag, td);
  506                 break;
  507         default:
  508                 error = ENOIOCTL;
  509                 break;
  510         }
  511         return (error);
  512 
  513 }

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