/*-
* 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_credf(MAKEDEV_ETERNAL, &g_ctl_cdevsw, 0, NULL,
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 nerror
* or EINVAL if nerror isn't specified.
*/
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;
return (req->nerror);
}
if (!req->nerror)
req->nerror = EINVAL;
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 (req->nerror);
}
/*
* 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);
req->nerror = copyin(uaddr, ptr, len);
if (!req->nerror)
return (ptr);
g_free(ptr);
return (NULL);
}
static void
gctl_copyin(struct gctl_req *req)
{
struct gctl_req_arg *ap;
char *p;
u_int i;
ap = geom_alloc_copyin(req, req->arg, req->narg * sizeof(*ap));
if (ap == NULL) {
gctl_error(req, "bad control request");
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;
}
for (i = 0; i < req->narg; i++) {
if (ap[i].nlen < 1 || ap[i].nlen > SPECNAMELEN) {
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') {
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) {
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') {
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)
{
u_int i;
sbuf_delete(req->serror);
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);
}
static void
gctl_dump(struct gctl_req *req)
{
struct gctl_req_arg *ap;
u_int i;
int j;
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));
}
if (req->arg == NULL)
return;
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)
{
u_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)
{
u_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)
{
u_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)
return (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: \"%s\"", p);
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: \"%s\"", p);
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;
/* 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);
req->serror = sbuf_new_auto();
/* Check the version */
if (req->version != GCTL_VERSION) {
gctl_error(req, "kernel and libgeom version mismatch.");
req->arg = NULL;
} else {
/* 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)) {
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);
}
