geom_ctl.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2002 Poul-Henning Kamp
    5  * Copyright (c) 2002 Networks Associates Technology, Inc.
    6  * All rights reserved.
    7  * Copyright (c) 2022 Alexander Motin <mav@FreeBSD.org>
    8  *
    9  * This software was developed for the FreeBSD Project by Poul-Henning Kamp
   10  * and NAI Labs, the Security Research Division of Network Associates, Inc.
   11  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
   12  * DARPA CHATS research program.
   13  *
   14  * Redistribution and use in source and binary forms, with or without
   15  * modification, are permitted provided that the following conditions
   16  * are met:
   17  * 1. Redistributions of source code must retain the above copyright
   18  *    notice, this list of conditions and the following disclaimer.
   19  * 2. Redistributions in binary form must reproduce the above copyright
   20  *    notice, this list of conditions and the following disclaimer in the
   21  *    documentation and/or other materials provided with the distribution.
   22  * 3. The names of the authors may not be used to endorse or promote
   23  *    products derived from this software without specific prior written
   24  *    permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __FBSDID("$FreeBSD$");
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/conf.h>
   45 #include <sys/malloc.h>
   46 #include <sys/sbuf.h>
   47 
   48 #include <vm/vm.h>
   49 #include <vm/vm_extern.h>
   50 
   51 #include <geom/geom.h>
   52 #include <geom/geom_int.h>
   53 #define GCTL_TABLE 1
   54 #include <geom/geom_ctl.h>
   55 
   56 #include <machine/stdarg.h>
   57 
   58 static d_ioctl_t g_ctl_ioctl;
   59 
   60 static struct cdevsw g_ctl_cdevsw = {
   61         .d_version =    D_VERSION,
   62         .d_flags =      0,
   63         .d_ioctl =      g_ctl_ioctl,
   64         .d_name =       "g_ctl",
   65 };
   66 
   67 CTASSERT(GCTL_PARAM_RD == VM_PROT_READ);
   68 CTASSERT(GCTL_PARAM_WR == VM_PROT_WRITE);
   69 
   70 void
   71 g_ctl_init(void)
   72 {
   73 
   74         make_dev_credf(MAKEDEV_ETERNAL, &g_ctl_cdevsw, 0, NULL,
   75             UID_ROOT, GID_OPERATOR, 0640, PATH_GEOM_CTL);
   76 }
   77 
   78 /*
   79  * Report an error back to the user in ascii format.  Return nerror
   80  * or EINVAL if nerror isn't specified.
   81  */
   82 int
   83 gctl_error(struct gctl_req *req, const char *fmt, ...)
   84 {
   85         va_list ap;
   86 
   87         if (req == NULL)
   88                 return (EINVAL);
   89 
   90         /* We only record the first error */
   91         if (sbuf_done(req->serror)) {
   92                 if (!req->nerror)
   93                         req->nerror = EEXIST;
   94 #ifdef DIAGNOSTIC
   95                 printf("gctl_error: buffer closed, message discarded.\n");
   96 #endif
   97                 return (req->nerror);
   98         }
   99         if (!req->nerror)
  100                 req->nerror = EINVAL;
  101 
  102         /* If this is the last of several messages, indent it on a new line */
  103         if (sbuf_len(req->serror) > 0)
  104                 sbuf_cat(req->serror, "\n\t");
  105         va_start(ap, fmt);
  106         sbuf_vprintf(req->serror, fmt, ap);
  107         va_end(ap);
  108         gctl_post_messages(req);
  109         return (req->nerror);
  110 }
  111 
  112 /*
  113  * The gctl_error() function will only report a single message.
  114  * Commands that handle multiple devices may want to report a
  115  * message for each of the devices. The gctl_msg() function
  116  * can be called multiple times to post messages. When done
  117  * the application must either call gctl_post_messages() or
  118  * call gctl_error() to cause the messages to be reported to
  119  * the calling process.
  120  *
  121  * The errno argument should be zero if it is an informational
  122  * message or an errno value (EINVAL, EBUSY, etc) if it is an error.
  123  * If any of the messages has a non-zero errno, the utility will
  124  * EXIT_FAILURE. If only informational messages (with zero errno)
  125  * are posted, the utility will EXIT_SUCCESS.
  126  */
  127 void
  128 gctl_msg(struct gctl_req *req, int errno, const char *fmt, ...)
  129 {
  130         va_list ap;
  131 
  132         if (req == NULL)
  133                 return;
  134         if (sbuf_done(req->serror)) {
  135 #ifdef DIAGNOSTIC
  136                 printf("gctl_msg: buffer closed, message discarded.\n");
  137 #endif
  138                 return;
  139         }
  140         if (req->nerror == 0)
  141                 req->nerror = errno;
  142         /* Put second and later messages indented on a new line */
  143         if (sbuf_len(req->serror) > 0)
  144                 sbuf_cat(req->serror, "\n\t");
  145         va_start(ap, fmt);
  146         sbuf_vprintf(req->serror, fmt, ap);
  147         va_end(ap);
  148 }
  149 
  150 /*
  151  * Post the messages to the user.
  152  */
  153 void
  154 gctl_post_messages(struct gctl_req *req)
  155 {
  156 
  157         if (sbuf_done(req->serror)) {
  158 #ifdef DIAGNOSTIC
  159                 printf("gctl_post_messages: message buffer already closed.\n");
  160 #endif
  161                 return;
  162         }
  163         sbuf_finish(req->serror);
  164         if (g_debugflags & G_F_CTLDUMP)
  165                 printf("gctl %p message(s) \"%s\"\n", req,
  166                     sbuf_data(req->serror));
  167 }
  168 
  169 /*
  170  * Allocate space and copyin() something.
  171  * XXX: this should really be a standard function in the kernel.
  172  */
  173 static void *
  174 geom_alloc_copyin(struct gctl_req *req, void *uaddr, size_t len)
  175 {
  176         void *ptr;
  177 
  178         ptr = g_malloc(len, M_WAITOK);
  179         req->nerror = copyin(uaddr, ptr, len);
  180         if (!req->nerror)
  181                 return (ptr);
  182         g_free(ptr);
  183         return (NULL);
  184 }
  185 
  186 static void
  187 gctl_copyin(struct gctl_req *req)
  188 {
  189         struct gctl_req_arg *ap;
  190         char *p;
  191         u_int i;
  192 
  193         if (req->narg > GEOM_CTL_ARG_MAX) {
  194                 gctl_error(req, "too many arguments");
  195                 req->arg = NULL;
  196                 return;
  197         }
  198 
  199         ap = geom_alloc_copyin(req, req->arg, req->narg * sizeof(*ap));
  200         if (ap == NULL) {
  201                 gctl_error(req, "bad control request");
  202                 req->arg = NULL;
  203                 return;
  204         }
  205 
  206         /* Nothing have been copyin()'ed yet */
  207         for (i = 0; i < req->narg; i++) {
  208                 ap[i].flag &= ~(GCTL_PARAM_NAMEKERNEL|GCTL_PARAM_VALUEKERNEL);
  209                 ap[i].flag &= ~GCTL_PARAM_CHANGED;
  210                 ap[i].kvalue = NULL;
  211         }
  212 
  213         for (i = 0; i < req->narg; i++) {
  214                 if (ap[i].nlen < 1 || ap[i].nlen > SPECNAMELEN) {
  215                         gctl_error(req,
  216                             "wrong param name length %d: %d", i, ap[i].nlen);
  217                         break;
  218                 }
  219                 p = geom_alloc_copyin(req, ap[i].name, ap[i].nlen);
  220                 if (p == NULL)
  221                         break;
  222                 if (p[ap[i].nlen - 1] != '\0') {
  223                         gctl_error(req, "unterminated param name");
  224                         g_free(p);
  225                         break;
  226                 }
  227                 ap[i].name = p;
  228                 ap[i].flag |= GCTL_PARAM_NAMEKERNEL;
  229                 if (ap[i].len <= 0) {
  230                         gctl_error(req, "negative param length");
  231                         break;
  232                 }
  233                 if (ap[i].flag & GCTL_PARAM_RD) {
  234                         p = geom_alloc_copyin(req, ap[i].value, ap[i].len);
  235                         if (p == NULL)
  236                                 break;
  237                         if ((ap[i].flag & GCTL_PARAM_ASCII) &&
  238                             p[ap[i].len - 1] != '\0') {
  239                                 gctl_error(req, "unterminated param value");
  240                                 g_free(p);
  241                                 break;
  242                         }
  243                 } else {
  244                         p = g_malloc(ap[i].len, M_WAITOK | M_ZERO);
  245                 }
  246                 ap[i].kvalue = p;
  247                 ap[i].flag |= GCTL_PARAM_VALUEKERNEL;
  248         }
  249         req->arg = ap;
  250         return;
  251 }
  252 
  253 static void
  254 gctl_copyout(struct gctl_req *req)
  255 {
  256         int error, i;
  257         struct gctl_req_arg *ap;
  258 
  259         if (req->nerror)
  260                 return;
  261         error = 0;
  262         ap = req->arg;
  263         for (i = 0; i < req->narg; i++, ap++) {
  264                 if (!(ap->flag & GCTL_PARAM_CHANGED))
  265                         continue;
  266                 error = copyout(ap->kvalue, ap->value, ap->len);
  267                 if (!error)
  268                         continue;
  269                 req->nerror = error;
  270                 return;
  271         }
  272         return;
  273 }
  274 
  275 static void
  276 gctl_free(struct gctl_req *req)
  277 {
  278         u_int i;
  279 
  280         sbuf_delete(req->serror);
  281         if (req->arg == NULL)
  282                 return;
  283         for (i = 0; i < req->narg; i++) {
  284                 if (req->arg[i].flag & GCTL_PARAM_NAMEKERNEL)
  285                         g_free(req->arg[i].name);
  286                 if ((req->arg[i].flag & GCTL_PARAM_VALUEKERNEL) &&
  287                     req->arg[i].len > 0)
  288                         g_free(req->arg[i].kvalue);
  289         }
  290         g_free(req->arg);
  291 }
  292 
  293 static void
  294 gctl_dump(struct gctl_req *req, const char *what)
  295 {
  296         struct gctl_req_arg *ap;
  297         u_int i;
  298         int j;
  299 
  300         printf("Dump of gctl %s at %p:\n", what, req);
  301         if (req->nerror > 0) {
  302                 printf("  nerror:\t%d\n", req->nerror);
  303                 if (sbuf_len(req->serror) > 0)
  304                         printf("  error:\t\"%s\"\n", sbuf_data(req->serror));
  305         }
  306         if (req->arg == NULL)
  307                 return;
  308         for (i = 0; i < req->narg; i++) {
  309                 ap = &req->arg[i];
  310                 if (!(ap->flag & GCTL_PARAM_NAMEKERNEL))
  311                         printf("  param:\t%d@%p", ap->nlen, ap->name);
  312                 else
  313                         printf("  param:\t\"%s\"", ap->name);
  314                 printf(" [%s%s%d] = ",
  315                     ap->flag & GCTL_PARAM_RD ? "R" : "",
  316                     ap->flag & GCTL_PARAM_WR ? "W" : "",
  317                     ap->len);
  318                 if (!(ap->flag & GCTL_PARAM_VALUEKERNEL)) {
  319                         printf(" =@ %p", ap->value);
  320                 } else if (ap->flag & GCTL_PARAM_ASCII) {
  321                         printf("\"%s\"", (char *)ap->kvalue);
  322                 } else if (ap->len > 0) {
  323                         for (j = 0; j < ap->len && j < 512; j++)
  324                                 printf(" %02x", ((u_char *)ap->kvalue)[j]);
  325                 } else {
  326                         printf(" = %p", ap->kvalue);
  327                 }
  328                 printf("\n");
  329         }
  330 }
  331 
  332 int
  333 gctl_set_param(struct gctl_req *req, const char *param, void const *ptr,
  334     int len)
  335 {
  336         u_int i;
  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_WR))
  344                         return (EPERM);
  345                 ap->flag |= GCTL_PARAM_CHANGED;
  346                 if (ap->len < len) {
  347                         bcopy(ptr, ap->kvalue, ap->len);
  348                         return (ENOSPC);
  349                 }
  350                 bcopy(ptr, ap->kvalue, len);
  351                 return (0);
  352         }
  353         return (EINVAL);
  354 }
  355 
  356 void
  357 gctl_set_param_err(struct gctl_req *req, const char *param, void const *ptr,
  358     int len)
  359 {
  360 
  361         switch (gctl_set_param(req, param, ptr, len)) {
  362         case EPERM:
  363                 gctl_error(req, "No write access %s argument", param);
  364                 break;
  365         case ENOSPC:
  366                 gctl_error(req, "Wrong length %s argument", param);
  367                 break;
  368         case EINVAL:
  369                 gctl_error(req, "Missing %s argument", param);
  370                 break;
  371         }
  372 }
  373 
  374 void *
  375 gctl_get_param_flags(struct gctl_req *req, const char *param, int flags, int *len)
  376 {
  377         u_int i;
  378         void *p;
  379         struct gctl_req_arg *ap;
  380 
  381         for (i = 0; i < req->narg; i++) {
  382                 ap = &req->arg[i];
  383                 if (strcmp(param, ap->name))
  384                         continue;
  385                 if ((ap->flag & flags) != flags)
  386                         continue;
  387                 p = ap->kvalue;
  388                 if (len != NULL)
  389                         *len = ap->len;
  390                 return (p);
  391         }
  392         return (NULL);
  393 }
  394 
  395 void *
  396 gctl_get_param(struct gctl_req *req, const char *param, int *len)
  397 {
  398 
  399         return (gctl_get_param_flags(req, param, GCTL_PARAM_RD, len));
  400 }
  401 
  402 char const *
  403 gctl_get_asciiparam(struct gctl_req *req, const char *param)
  404 {
  405         char const *p;
  406         int len;
  407 
  408         p = gctl_get_param_flags(req, param, GCTL_PARAM_RD, &len);
  409         if (p == NULL)
  410                 return (NULL);
  411         if (len < 1) {
  412                 gctl_error(req, "Argument without length (%s)", param);
  413                 return (NULL);
  414         }
  415         if (p[len - 1] != '\0') {
  416                 gctl_error(req, "Unterminated argument (%s)", param);
  417                 return (NULL);
  418         }
  419         return (p);
  420 }
  421 
  422 void *
  423 gctl_get_paraml_opt(struct gctl_req *req, const char *param, int len)
  424 {
  425         int i;
  426         void *p;
  427 
  428         p = gctl_get_param(req, param, &i);
  429         if (i != len) {
  430                 p = NULL;
  431                 gctl_error(req, "Wrong length %s argument", param);
  432         }
  433         return (p);
  434 }
  435 
  436 void *
  437 gctl_get_paraml(struct gctl_req *req, const char *param, int len)
  438 {
  439         void *p;
  440 
  441         p = gctl_get_paraml_opt(req, param, len);
  442         if (p == NULL)
  443                 gctl_error(req, "Missing %s argument", param);
  444         return (p);
  445 }
  446 
  447 struct g_class *
  448 gctl_get_class(struct gctl_req *req, char const *arg)
  449 {
  450         char const *p;
  451         struct g_class *cp;
  452 
  453         p = gctl_get_asciiparam(req, arg);
  454         if (p == NULL) {
  455                 gctl_error(req, "Missing %s argument", arg);
  456                 return (NULL);
  457         }
  458         LIST_FOREACH(cp, &g_classes, class) {
  459                 if (!strcmp(p, cp->name))
  460                         return (cp);
  461         }
  462         gctl_error(req, "Class not found: \"%s\"", p);
  463         return (NULL);
  464 }
  465 
  466 struct g_geom *
  467 gctl_get_geom(struct gctl_req *req, struct g_class *mp, char const *arg)
  468 {
  469         char const *p;
  470         struct g_geom *gp;
  471 
  472         MPASS(mp != NULL);
  473         p = gctl_get_asciiparam(req, arg);
  474         if (p == NULL) {
  475                 gctl_error(req, "Missing %s argument", arg);
  476                 return (NULL);
  477         }
  478         LIST_FOREACH(gp, &mp->geom, geom)
  479                 if (!strcmp(p, gp->name))
  480                         return (gp);
  481         gctl_error(req, "Geom not found: \"%s\"", p);
  482         return (NULL);
  483 }
  484 
  485 struct g_provider *
  486 gctl_get_provider(struct gctl_req *req, char const *arg)
  487 {
  488         char const *p;
  489         struct g_provider *pp;
  490 
  491         p = gctl_get_asciiparam(req, arg);
  492         if (p == NULL) {
  493                 gctl_error(req, "Missing '%s' argument", arg);
  494                 return (NULL);
  495         }
  496         pp = g_provider_by_name(p);
  497         if (pp != NULL)
  498                 return (pp);
  499         gctl_error(req, "Provider not found: \"%s\"", p);
  500         return (NULL);
  501 }
  502 
  503 static void
  504 g_ctl_getxml(struct gctl_req *req, struct g_class *mp)
  505 {
  506         const char *name;
  507         char *buf;
  508         struct sbuf *sb;
  509         int len, i = 0, n = 0, *parents;
  510         struct g_geom *gp, **gps;
  511         struct g_consumer *cp;
  512 
  513         parents = gctl_get_paraml(req, "parents", sizeof(*parents));
  514         if (parents == NULL)
  515                 return;
  516         name = gctl_get_asciiparam(req, "arg0");
  517         n = 0;
  518         LIST_FOREACH(gp, &mp->geom, geom) {
  519                 if (name && strcmp(gp->name, name) != 0)
  520                         continue;
  521                 n++;
  522                 if (*parents) {
  523                         LIST_FOREACH(cp, &gp->consumer, consumer)
  524                                 n++;
  525                 }
  526         }
  527         gps = g_malloc((n + 1) * sizeof(*gps), M_WAITOK);
  528         i = 0;
  529         LIST_FOREACH(gp, &mp->geom, geom) {
  530                 if (name && strcmp(gp->name, name) != 0)
  531                         continue;
  532                 gps[i++] = gp;
  533                 if (*parents) {
  534                         LIST_FOREACH(cp, &gp->consumer, consumer) {
  535                                 if (cp->provider != NULL)
  536                                         gps[i++] = cp->provider->geom;
  537                         }
  538                 }
  539         }
  540         KASSERT(i == n, ("different number of geoms found (%d != %d)",
  541             i, n));
  542         gps[i] = 0;
  543 
  544         buf = gctl_get_param_flags(req, "output", GCTL_PARAM_WR, &len);
  545         if (buf == NULL) {
  546                 gctl_error(req, "output parameter missing");
  547                 g_free(gps);
  548                 return;
  549         }
  550         sb = sbuf_new(NULL, buf, len, SBUF_FIXEDLEN | SBUF_INCLUDENUL);
  551         g_conf_specific(sb, gps);
  552         gctl_set_param(req, "output", buf, 0);
  553         if (sbuf_error(sb))
  554                 gctl_error(req, "output buffer overflow");
  555         sbuf_delete(sb);
  556         g_free(gps);
  557 }
  558 
  559 static void
  560 g_ctl_req(void *arg, int flag __unused)
  561 {
  562         struct g_class *mp;
  563         struct gctl_req *req;
  564         char const *verb;
  565 
  566         g_topology_assert();
  567         req = arg;
  568         mp = gctl_get_class(req, "class");
  569         if (mp == NULL)
  570                 return;
  571         verb = gctl_get_param(req, "verb", NULL);
  572         if (verb == NULL) {
  573                 gctl_error(req, "Verb missing");
  574                 return;
  575         }
  576         if (strcmp(verb, "getxml") == 0) {
  577                 g_ctl_getxml(req, mp);
  578         } else if (mp->ctlreq == NULL) {
  579                 gctl_error(req, "Class takes no requests");
  580         } else {
  581                 mp->ctlreq(req, mp, verb);
  582         }
  583         g_topology_assert();
  584 }
  585 
  586 static int
  587 g_ctl_ioctl_ctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
  588 {
  589         struct gctl_req *req;
  590         int nerror;
  591 
  592         req = (void *)data;
  593         req->nerror = 0;
  594         /* It is an error if we cannot return an error text */
  595         if (req->lerror < 2)
  596                 return (EINVAL);
  597         if (!useracc(req->error, req->lerror, VM_PROT_WRITE))
  598                 return (EINVAL);
  599 
  600         req->serror = sbuf_new_auto();
  601         /* Check the version */
  602         if (req->version != GCTL_VERSION) {
  603                 gctl_error(req, "kernel and libgeom version mismatch.");
  604                 req->arg = NULL;
  605         } else {
  606                 /* Get things on board */
  607                 gctl_copyin(req);
  608 
  609                 if (g_debugflags & G_F_CTLDUMP)
  610                         gctl_dump(req, "request");
  611 
  612                 if (!req->nerror) {
  613                         g_waitfor_event(g_ctl_req, req, M_WAITOK, NULL);
  614 
  615                         if (g_debugflags & G_F_CTLDUMP)
  616                                 gctl_dump(req, "result");
  617 
  618                         gctl_copyout(req);
  619                 }
  620         }
  621         if (sbuf_done(req->serror)) {
  622                 copyout(sbuf_data(req->serror), req->error,
  623                     imin(req->lerror, sbuf_len(req->serror) + 1));
  624         }
  625 
  626         nerror = req->nerror;
  627         gctl_free(req);
  628         return (nerror);
  629 }
  630 
  631 static int
  632 g_ctl_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
  633 {
  634         int error;
  635 
  636         switch(cmd) {
  637         case GEOM_CTL:
  638                 error = g_ctl_ioctl_ctl(dev, cmd, data, fflag, td);
  639                 break;
  640         default:
  641                 error = ENOIOCTL;
  642                 break;
  643         }
  644         return (error);
  645 
  646 }
Cache object: 25350ae937dcd7b4bf2450404b2bdd14
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FreeBSD/Linux Kernel Cross Reference sys/geom/geom_ctl.c

FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_ctl.c
