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freebsd-dev/sys/geom/geom_ctl.c
Marcel Moolenaar 41063f9380 Change gctl_set_param() to return an error instead of setting an 
error on the request.  Add a wrapper, gctl_set_param_err(), that
sets the error on the request from the error returned by
gctl_set_param() and update current callers of gctl_set_param()
to call gctl_set_param_err() instead.
This makes gctl_set_param() much more usable in situations where
the caller knows better what to do with certain (apparent) error
conditions and setting an error on the request is not one of the
things that need to be done.
2006-04-07 16:19:48 +00:00

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/*-
* Copyright (c) 2002 Poul-Henning Kamp
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by Poul-Henning Kamp
* and NAI Labs, the Security Research Division of Network Associates, Inc.
* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
* DARPA CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The names of the authors may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_geom.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/bio.h>
#include <sys/conf.h>
#include <sys/disk.h>
#include <sys/malloc.h>
#include <sys/sysctl.h>
#include <sys/sbuf.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <geom/geom.h>
#include <geom/geom_int.h>
#define GCTL_TABLE 1
#include <geom/geom_ctl.h>
#include <machine/stdarg.h>
static d_ioctl_t g_ctl_ioctl;
static struct cdevsw g_ctl_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_ioctl = g_ctl_ioctl,
.d_name = "g_ctl",
};
void
g_ctl_init(void)
{
make_dev(&g_ctl_cdevsw, 0,
UID_ROOT, GID_OPERATOR, 0640, PATH_GEOM_CTL);
KASSERT(GCTL_PARAM_RD == VM_PROT_READ,
("GCTL_PARAM_RD != VM_PROT_READ"));
KASSERT(GCTL_PARAM_WR == VM_PROT_WRITE,
("GCTL_PARAM_WR != VM_PROT_WRITE"));
}
/*
* Report an error back to the user in ascii format. Return whatever copyout
* returned, or EINVAL if it succeeded.
*/
int
gctl_error(struct gctl_req *req, const char *fmt, ...)
{
va_list ap;
if (req == NULL)
return (EINVAL);
/* We only record the first error */
if (sbuf_done(req->serror)) {
if (!req->nerror)
req->nerror = EEXIST;
}
if (req->nerror)
return (req->nerror);
va_start(ap, fmt);
sbuf_vprintf(req->serror, fmt, ap);
va_end(ap);
sbuf_finish(req->serror);
if (g_debugflags & G_F_CTLDUMP)
printf("gctl %p error \"%s\"\n", req, sbuf_data(req->serror));
return (0);
}
/*
* Allocate space and copyin() something.
* XXX: this should really be a standard function in the kernel.
*/
static void *
geom_alloc_copyin(struct gctl_req *req, void *uaddr, size_t len)
{
void *ptr;
ptr = g_malloc(len, M_WAITOK);
if (ptr == NULL)
req->nerror = ENOMEM;
else
req->nerror = copyin(uaddr, ptr, len);
if (!req->nerror)
return (ptr);
if (ptr != NULL)
g_free(ptr);
return (NULL);
}
static void
gctl_copyin(struct gctl_req *req)
{
int error, i;
struct gctl_req_arg *ap;
char *p;
ap = geom_alloc_copyin(req, req->arg, req->narg * sizeof(*ap));
if (ap == NULL) {
req->nerror = ENOMEM;
req->arg = NULL;
return;
}
/* Nothing have been copyin()'ed yet */
for (i = 0; i < req->narg; i++) {
ap[i].flag &= ~(GCTL_PARAM_NAMEKERNEL|GCTL_PARAM_VALUEKERNEL);
ap[i].flag &= ~GCTL_PARAM_CHANGED;
ap[i].kvalue = NULL;
}
error = 0;
for (i = 0; i < req->narg; i++) {
if (ap[i].nlen < 1 || ap[i].nlen > SPECNAMELEN) {
error = gctl_error(req,
"wrong param name length %d: %d", i, ap[i].nlen);
break;
}
p = geom_alloc_copyin(req, ap[i].name, ap[i].nlen);
if (p == NULL)
break;
if (p[ap[i].nlen - 1] != '\0') {
error = gctl_error(req, "unterminated param name");
g_free(p);
break;
}
ap[i].name = p;
ap[i].flag |= GCTL_PARAM_NAMEKERNEL;
if (ap[i].len <= 0) {
error = gctl_error(req, "negative param length");
break;
}
p = geom_alloc_copyin(req, ap[i].value, ap[i].len);
if (p == NULL)
break;
if ((ap[i].flag & GCTL_PARAM_ASCII) &&
p[ap[i].len - 1] != '\0') {
error = gctl_error(req, "unterminated param value");
g_free(p);
break;
}
ap[i].kvalue = p;
ap[i].flag |= GCTL_PARAM_VALUEKERNEL;
}
req->arg = ap;
return;
}
static void
gctl_copyout(struct gctl_req *req)
{
int error, i;
struct gctl_req_arg *ap;
if (req->nerror)
return;
error = 0;
ap = req->arg;
for (i = 0; i < req->narg; i++, ap++) {
if (!(ap->flag & GCTL_PARAM_CHANGED))
continue;
error = copyout(ap->kvalue, ap->value, ap->len);
if (!error)
continue;
req->nerror = error;
return;
}
return;
}
static void
gctl_free(struct gctl_req *req)
{
int i;
if (req->arg == NULL)
return;
for (i = 0; i < req->narg; i++) {
if (req->arg[i].flag & GCTL_PARAM_NAMEKERNEL)
g_free(req->arg[i].name);
if ((req->arg[i].flag & GCTL_PARAM_VALUEKERNEL) &&
req->arg[i].len > 0)
g_free(req->arg[i].kvalue);
}
g_free(req->arg);
sbuf_delete(req->serror);
}
static void
gctl_dump(struct gctl_req *req)
{
u_int i;
int j;
struct gctl_req_arg *ap;
printf("Dump of gctl request at %p:\n", req);
if (req->nerror > 0) {
printf(" nerror:\t%d\n", req->nerror);
if (sbuf_len(req->serror) > 0)
printf(" error:\t\"%s\"\n", sbuf_data(req->serror));
}
for (i = 0; i < req->narg; i++) {
ap = &req->arg[i];
if (!(ap->flag & GCTL_PARAM_NAMEKERNEL))
printf(" param:\t%d@%p", ap->nlen, ap->name);
else
printf(" param:\t\"%s\"", ap->name);
printf(" [%s%s%d] = ",
ap->flag & GCTL_PARAM_RD ? "R" : "",
ap->flag & GCTL_PARAM_WR ? "W" : "",
ap->len);
if (!(ap->flag & GCTL_PARAM_VALUEKERNEL)) {
printf(" =@ %p", ap->value);
} else if (ap->flag & GCTL_PARAM_ASCII) {
printf("\"%s\"", (char *)ap->kvalue);
} else if (ap->len > 0) {
for (j = 0; j < ap->len && j < 512; j++)
printf(" %02x", ((u_char *)ap->kvalue)[j]);
} else {
printf(" = %p", ap->kvalue);
}
printf("\n");
}
}
int
gctl_set_param(struct gctl_req *req, const char *param, void const *ptr,
int len)
{
int i;
struct gctl_req_arg *ap;
for (i = 0; i < req->narg; i++) {
ap = &req->arg[i];
if (strcmp(param, ap->name))
continue;
if (!(ap->flag & GCTL_PARAM_WR))
return (EPERM);
ap->flag |= GCTL_PARAM_CHANGED;
if (ap->len < len) {
bcopy(ptr, ap->kvalue, ap->len);
return (ENOSPC);
}
bcopy(ptr, ap->kvalue, len);
return (0);
}
return (EINVAL);
}
void
gctl_set_param_err(struct gctl_req *req, const char *param, void const *ptr,
int len)
{
switch (gctl_set_param(req, param, ptr, len)) {
case EPERM:
gctl_error(req, "No write access %s argument", param);
break;
case ENOSPC:
gctl_error(req, "Wrong length %s argument", param);
break;
case EINVAL:
gctl_error(req, "Missing %s argument", param);
break;
}
}
void *
gctl_get_param(struct gctl_req *req, const char *param, int *len)
{
int i;
void *p;
struct gctl_req_arg *ap;
for (i = 0; i < req->narg; i++) {
ap = &req->arg[i];
if (strcmp(param, ap->name))
continue;
if (!(ap->flag & GCTL_PARAM_RD))
continue;
p = ap->kvalue;
if (len != NULL)
*len = ap->len;
return (p);
}
return (NULL);
}
char const *
gctl_get_asciiparam(struct gctl_req *req, const char *param)
{
int i;
char const *p;
struct gctl_req_arg *ap;
for (i = 0; i < req->narg; i++) {
ap = &req->arg[i];
if (strcmp(param, ap->name))
continue;
if (!(ap->flag & GCTL_PARAM_RD))
continue;
p = ap->kvalue;
if (ap->len < 1) {
gctl_error(req, "No length argument (%s)", param);
return (NULL);
}
if (p[ap->len - 1] != '\0') {
gctl_error(req, "Unterminated argument (%s)", param);
return (NULL);
}
return (p);
}
return (NULL);
}
void *
gctl_get_paraml(struct gctl_req *req, const char *param, int len)
{
int i;
void *p;
p = gctl_get_param(req, param, &i);
if (p == NULL)
gctl_error(req, "Missing %s argument", param);
else if (i != len) {
p = NULL;
gctl_error(req, "Wrong length %s argument", param);
}
return (p);
}
struct g_class *
gctl_get_class(struct gctl_req *req, char const *arg)
{
char const *p;
struct g_class *cp;
p = gctl_get_asciiparam(req, arg);
if (p == NULL)
return (NULL);
LIST_FOREACH(cp, &g_classes, class) {
if (!strcmp(p, cp->name))
return (cp);
}
return (NULL);
}
struct g_geom *
gctl_get_geom(struct gctl_req *req, struct g_class *mpr, char const *arg)
{
char const *p;
struct g_class *mp;
struct g_geom *gp;
p = gctl_get_asciiparam(req, arg);
if (p != NULL) {
LIST_FOREACH(mp, &g_classes, class) {
if (mpr != NULL && mpr != mp)
continue;
LIST_FOREACH(gp, &mp->geom, geom) {
if (!strcmp(p, gp->name))
return (gp);
}
}
}
gctl_error(req, "Geom not found");
return (NULL);
}
struct g_provider *
gctl_get_provider(struct gctl_req *req, char const *arg)
{
char const *p;
struct g_provider *pp;
p = gctl_get_asciiparam(req, arg);
if (p == NULL)
return (NULL);
pp = g_provider_by_name(p);
if (pp != NULL)
return (pp);
gctl_error(req, "Provider not found");
return (NULL);
}
static void
g_ctl_req(void *arg, int flag __unused)
{
struct g_class *mp;
struct gctl_req *req;
char const *verb;
g_topology_assert();
req = arg;
mp = gctl_get_class(req, "class");
if (mp == NULL) {
gctl_error(req, "Class not found");
return;
}
if (mp->ctlreq == NULL) {
gctl_error(req, "Class takes no requests");
return;
}
verb = gctl_get_param(req, "verb", NULL);
if (verb == NULL) {
gctl_error(req, "Verb missing");
return;
}
mp->ctlreq(req, mp, verb);
g_topology_assert();
}
static int
g_ctl_ioctl_ctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
{
struct gctl_req *req;
int nerror;
req = (void *)data;
req->nerror = 0;
req->serror = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
/* It is an error if we cannot return an error text */
if (req->lerror < 2)
return (EINVAL);
if (!useracc(req->error, req->lerror, VM_PROT_WRITE))
return (EINVAL);
/* Check the version */
if (req->version != GCTL_VERSION)
return (gctl_error(req,
"kernel and libgeom version mismatch."));
/* Get things on board */
gctl_copyin(req);
if (g_debugflags & G_F_CTLDUMP)
gctl_dump(req);
if (!req->nerror) {
g_waitfor_event(g_ctl_req, req, M_WAITOK, NULL);
gctl_copyout(req);
}
if (sbuf_done(req->serror)) {
req->nerror = copyout(sbuf_data(req->serror), req->error,
imin(req->lerror, sbuf_len(req->serror) + 1));
}
nerror = req->nerror;
gctl_free(req);
return (nerror);
}
static int
g_ctl_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
{
int error;
switch(cmd) {
case GEOM_CTL:
error = g_ctl_ioctl_ctl(dev, cmd, data, fflag, td);
break;
default:
error = ENOIOCTL;
break;
}
return (error);
}
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