325338fe3d
were declared as non-const. This is backwards (_lkm_exec() changes the pointers but all the target `struct execsw's are const). Fixed this and poisoned related declarations to match and removed the bogus casts that hid the bug.
933 lines
21 KiB
C
933 lines
21 KiB
C
/*-
|
|
* Copyright (c) 1992 Terrence R. Lambert.
|
|
* Copyright (c) 1994 Christopher G. Demetriou
|
|
* All rights reserved.
|
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*
|
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* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Terrence R. Lambert.
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|
* 4. The name Terrence R. Lambert may not be used to endorse or promote
|
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* products derived from this software without specific prior written
|
|
* permission.
|
|
*
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|
* THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``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 TERRENCE R. LAMBERT 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
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
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*
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* $Id: kern_lkm.c,v 1.31 1996/05/24 01:39:50 dyson Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/ioctl.h>
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#include <sys/tty.h>
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#include <sys/conf.h>
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#include <sys/file.h>
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#include <sys/proc.h>
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#include <sys/uio.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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|
#include <sys/sysent.h>
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#include <sys/exec.h>
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#include <sys/imgact.h>
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#include <sys/lkm.h>
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#include <sys/vnode.h>
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#ifdef DEVFS
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#include <sys/devfsext.h>
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#endif /*DEVFS*/
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|
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#include <vm/vm.h>
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|
#include <vm/vm_param.h>
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|
#include <vm/vm_kern.h>
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|
#include <vm/vm_extern.h>
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|
|
|
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|
#define PAGESIZE 1024 /* kmem_alloc() allocation quantum */
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|
|
|
#define LKM_ALLOC 0x01
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#define LKM_WANT 0x02
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|
|
|
#define LKMS_IDLE 0x00
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#define LKMS_RESERVED 0x01
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#define LKMS_LOADING 0x02
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#define LKMS_LOADED 0x04
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#define LKMS_UNLOADING 0x08
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|
|
|
static int lkm_v = 0;
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static int lkm_state = LKMS_IDLE;
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|
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|
#ifndef MAXLKMS
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#define MAXLKMS 20
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#endif
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|
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static struct lkm_table lkmods[MAXLKMS]; /* table of loaded modules */
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static struct lkm_table *curp; /* global for in-progress ops */
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|
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static int _lkm_dev __P((struct lkm_table *lkmtp, int cmd));
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static int _lkm_exec __P((struct lkm_table *lkmtp, int cmd));
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static int _lkm_vfs __P((struct lkm_table *lkmtp, int cmd));
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static int _lkm_syscall __P((struct lkm_table *lkmtp, int cmd));
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static void lkmunreserve __P((void));
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|
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|
static d_open_t lkmcopen;
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static d_close_t lkmcclose;
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static d_ioctl_t lkmcioctl;
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|
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|
#define CDEV_MAJOR 32
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static struct cdevsw lkmc_cdevsw =
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{ lkmcopen, lkmcclose, noread, nowrite, /*32*/
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lkmcioctl, nostop, nullreset, nodevtotty,
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noselect, nommap, NULL, "lkm", NULL, -1 };
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|
|
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|
/*ARGSUSED*/
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static int
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lkmcopen(dev, flag, devtype, p)
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|
dev_t dev;
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|
int flag;
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int devtype;
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struct proc *p;
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|
{
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int error;
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|
|
|
if (minor(dev) != 0)
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return(ENXIO); /* bad minor # */
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|
|
|
/*
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* Use of the loadable kernel module device must be exclusive; we
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* may try to remove this restriction later, but it's really no
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* hardship.
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|
*/
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while (lkm_v & LKM_ALLOC) {
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if (flag & FNONBLOCK) /* don't hang */
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return(EBUSY);
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lkm_v |= LKM_WANT;
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/*
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* Sleep pending unlock; we use tsleep() to allow
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* an alarm out of the open.
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|
*/
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error = tsleep((caddr_t)&lkm_v, TTIPRI|PCATCH, "lkmopn", 0);
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if (error)
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return(error); /* leave LKM_WANT set -- no problem */
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}
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lkm_v |= LKM_ALLOC;
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|
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|
return(0); /* pseudo-device open */
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|
}
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|
|
|
/*
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* Unreserve the memory associated with the current loaded module; done on
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* a coerced close of the lkm device (close on premature exit of modload)
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* or explicitly by modload as a result of a link failure.
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*/
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static void
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|
lkmunreserve()
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|
{
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|
|
|
if (lkm_state == LKMS_IDLE)
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return;
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|
|
|
/*
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* Actually unreserve the memory
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|
*/
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if (curp && curp->area) {
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kmem_free(kernel_map, curp->area, curp->size);/**/
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curp->area = 0;
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if (curp->private.lkm_any != NULL)
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curp->private.lkm_any = NULL;
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}
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lkm_state = LKMS_IDLE;
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}
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static int
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lkmcclose(dev, flag, mode, p)
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|
dev_t dev;
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int flag;
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int mode;
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|
struct proc *p;
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|
{
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|
|
|
if (!(lkm_v & LKM_ALLOC)) {
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#ifdef DEBUG
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printf("LKM: close before open!\n");
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|
#endif /* DEBUG */
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return(EBADF);
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|
}
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|
/* do this before waking the herd... */
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|
if (curp && !curp->used) {
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|
/*
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|
* If we close before setting used, we have aborted
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|
* by way of error or by way of close-on-exit from
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* a premature exit of "modload".
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|
*/
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lkmunreserve(); /* coerce state to LKM_IDLE */
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|
}
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|
lkm_v &= ~LKM_ALLOC;
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wakeup((caddr_t)&lkm_v); /* thundering herd "problem" here */
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|
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|
return(0); /* pseudo-device closed */
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}
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|
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|
/*ARGSUSED*/
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static int
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|
lkmcioctl(dev, cmd, data, flag, p)
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|
dev_t dev;
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|
int cmd;
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|
caddr_t data;
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|
int flag;
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|
struct proc *p;
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|
{
|
|
int err = 0;
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|
int i;
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|
struct lmc_resrv *resrvp;
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|
struct lmc_loadbuf *loadbufp;
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|
struct lmc_unload *unloadp;
|
|
struct lmc_stat *statp;
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|
char istr[MAXLKMNAME];
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|
|
|
switch(cmd) {
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|
case LMRESERV: /* reserve pages for a module */
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|
if ((flag & FWRITE) == 0 || securelevel > 0)
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/* only allow this if writing and insecure */
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|
return EPERM;
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|
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|
resrvp = (struct lmc_resrv *)data;
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|
|
|
/*
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|
* Find a free slot.
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|
*/
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for (i = 0; i < MAXLKMS; i++)
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|
if (!lkmods[i].used)
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|
break;
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|
if (i == MAXLKMS) {
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|
err = ENOMEM; /* no slots available */
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|
break;
|
|
}
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|
curp = &lkmods[i];
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|
curp->id = i; /* self reference slot offset */
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|
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|
resrvp->slot = i; /* return slot */
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|
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|
/*
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|
* Get memory for module
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|
*/
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curp->size = resrvp->size;
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curp->area = kmem_alloc(kernel_map, curp->size);/**/
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|
curp->offset = 0; /* load offset */
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resrvp->addr = curp->area; /* ret kernel addr */
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|
|
#ifdef DEBUG
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|
printf("LKM: LMRESERV (actual = 0x%08x)\n", curp->area);
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printf("LKM: LMRESERV (adjusted = 0x%08x)\n",
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|
trunc_page(curp->area));
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|
#endif /* DEBUG */
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lkm_state = LKMS_RESERVED;
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break;
|
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|
case LMLOADBUF: /* Copy in; stateful, follows LMRESERV */
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if ((flag & FWRITE) == 0 || securelevel > 0)
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|
/* only allow this if writing and insecure */
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|
return EPERM;
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|
loadbufp = (struct lmc_loadbuf *)data;
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|
i = loadbufp->cnt;
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|
if ((lkm_state != LKMS_RESERVED && lkm_state != LKMS_LOADING)
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|| i < 0
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|
|| i > MODIOBUF
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|| i > curp->size - curp->offset) {
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|
err = ENOMEM;
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|
break;
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|
}
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|
/* copy in buffer full of data */
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|
err = copyin((caddr_t)loadbufp->data,
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(caddr_t)curp->area + curp->offset, i);
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if (err)
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|
break;
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|
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|
if ((curp->offset + i) < curp->size) {
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|
lkm_state = LKMS_LOADING;
|
|
#ifdef DEBUG
|
|
printf("LKM: LMLOADBUF (loading @ %d of %d, i = %d)\n",
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|
curp->offset, curp->size, i);
|
|
#endif /* DEBUG */
|
|
} else {
|
|
lkm_state = LKMS_LOADED;
|
|
#ifdef DEBUG
|
|
printf("LKM: LMLOADBUF (loaded)\n");
|
|
#endif /* DEBUG */
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|
}
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|
curp->offset += i;
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|
break;
|
|
|
|
case LMUNRESRV: /* discard reserved pages for a module */
|
|
if ((flag & FWRITE) == 0 || securelevel > 0)
|
|
/* only allow this if writing and insecure */
|
|
return EPERM;
|
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|
|
lkmunreserve(); /* coerce state to LKM_IDLE */
|
|
#ifdef DEBUG
|
|
printf("LKM: LMUNRESERV\n");
|
|
#endif /* DEBUG */
|
|
break;
|
|
|
|
case LMREADY: /* module loaded: call entry */
|
|
if ((flag & FWRITE) == 0 || securelevel > 0)
|
|
/* only allow this if writing or insecure */
|
|
return EPERM;
|
|
|
|
switch (lkm_state) {
|
|
case LKMS_LOADED:
|
|
break;
|
|
case LKMS_LOADING:
|
|
/* The remainder must be bss, so we clear it */
|
|
bzero((caddr_t)curp->area + curp->offset,
|
|
curp->size - curp->offset);
|
|
break;
|
|
default:
|
|
|
|
#ifdef DEBUG
|
|
printf("lkm_state is %02x\n", lkm_state);
|
|
#endif /* DEBUG */
|
|
return ENXIO;
|
|
}
|
|
|
|
/* XXX gack */
|
|
curp->entry = (int (*) __P((struct lkm_table *, int, int)))
|
|
(*((int *)data));
|
|
|
|
/* call entry(load)... (assigns "private" portion) */
|
|
err = (*(curp->entry))(curp, LKM_E_LOAD, LKM_VERSION);
|
|
if (err) {
|
|
/*
|
|
* Module may refuse loading or may have a
|
|
* version mismatch...
|
|
*/
|
|
lkm_state = LKMS_UNLOADING; /* for lkmunreserve */
|
|
lkmunreserve(); /* free memory */
|
|
curp->used = 0; /* free slot */
|
|
break;
|
|
}
|
|
/*
|
|
* It's possible for a user to load a module that doesn't
|
|
* initialize itself correctly. (You can even get away with
|
|
* using it for a while.) Unfortunately, we are faced with
|
|
* the following problems:
|
|
* - we can't tell a good module from a bad one until
|
|
* after we've run its entry function (if the private
|
|
* section is uninitalized after we return from the
|
|
* entry, then something's fishy)
|
|
* - now that we've called the entry function, we can't
|
|
* forcibly unload the module without risking a crash
|
|
* - since we don't know what the module's entry function
|
|
* did, we can't easily clean up the mess it may have
|
|
* made, so we can't know just how unstable the system
|
|
* may be
|
|
* So, being stuck between a rock and a hard place, we
|
|
* have no choice but to do this...
|
|
*/
|
|
if (curp->private.lkm_any == NULL)
|
|
panic("loadable module initialization failed");
|
|
|
|
curp->used = 1;
|
|
#ifdef DEBUG
|
|
printf("LKM: LMREADY\n");
|
|
#endif /* DEBUG */
|
|
lkm_state = LKMS_IDLE;
|
|
break;
|
|
|
|
case LMUNLOAD: /* unload a module */
|
|
if ((flag & FWRITE) == 0 || securelevel > 0)
|
|
/* only allow this if writing and insecure */
|
|
return EPERM;
|
|
|
|
unloadp = (struct lmc_unload *)data;
|
|
|
|
if ((i = unloadp->id) == -1) { /* unload by name */
|
|
/*
|
|
* Copy name and lookup id from all loaded
|
|
* modules. May fail.
|
|
*/
|
|
err =copyinstr(unloadp->name, istr, MAXLKMNAME-1, NULL);
|
|
if (err)
|
|
break;
|
|
|
|
/*
|
|
* look up id...
|
|
*/
|
|
for (i = 0; i < MAXLKMS; i++) {
|
|
if (!lkmods[i].used)
|
|
continue;
|
|
if (!strcmp(istr,
|
|
lkmods[i].private.lkm_any->lkm_name))
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Range check the value; on failure, return EINVAL
|
|
*/
|
|
if (i < 0 || i >= MAXLKMS) {
|
|
err = EINVAL;
|
|
break;
|
|
}
|
|
|
|
curp = &lkmods[i];
|
|
|
|
if (!curp->used) {
|
|
err = ENOENT;
|
|
break;
|
|
}
|
|
|
|
/* call entry(unload) */
|
|
if ((*(curp->entry))(curp, LKM_E_UNLOAD, LKM_VERSION)) {
|
|
err = EBUSY;
|
|
break;
|
|
}
|
|
|
|
lkm_state = LKMS_UNLOADING; /* non-idle for lkmunreserve */
|
|
lkmunreserve(); /* free memory */
|
|
curp->used = 0; /* free slot */
|
|
break;
|
|
|
|
case LMSTAT: /* stat a module by id/name */
|
|
/* allow readers and writers to stat */
|
|
|
|
statp = (struct lmc_stat *)data;
|
|
|
|
if ((i = statp->id) == -1) { /* stat by name */
|
|
/*
|
|
* Copy name and lookup id from all loaded
|
|
* modules.
|
|
*/
|
|
copystr(statp->name, istr, MAXLKMNAME-1, NULL);
|
|
/*
|
|
* look up id...
|
|
*/
|
|
for (i = 0; i < MAXLKMS; i++) {
|
|
if (!lkmods[i].used)
|
|
continue;
|
|
if (!strcmp(istr,
|
|
lkmods[i].private.lkm_any->lkm_name))
|
|
break;
|
|
}
|
|
|
|
if (i == MAXLKMS) { /* Not found */
|
|
err = ENOENT;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Range check the value; on failure, return EINVAL
|
|
*/
|
|
if (i < 0 || i >= MAXLKMS) {
|
|
err = EINVAL;
|
|
break;
|
|
}
|
|
|
|
curp = &lkmods[i];
|
|
|
|
if (!curp->used) { /* Not found */
|
|
err = ENOENT;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Copy out stat information for this module...
|
|
*/
|
|
statp->id = curp->id;
|
|
statp->offset = curp->private.lkm_any->lkm_offset;
|
|
statp->type = curp->private.lkm_any->lkm_type;
|
|
statp->area = curp->area;
|
|
statp->size = curp->size / PAGESIZE;
|
|
statp->private = (unsigned long)curp->private.lkm_any;
|
|
statp->ver = curp->private.lkm_any->lkm_ver;
|
|
copystr(curp->private.lkm_any->lkm_name,
|
|
statp->name,
|
|
MAXLKMNAME - 2,
|
|
NULL);
|
|
|
|
break;
|
|
|
|
default: /* bad ioctl()... */
|
|
err = ENOTTY;
|
|
break;
|
|
}
|
|
|
|
return (err);
|
|
}
|
|
|
|
/*
|
|
* Acts like "nosys" but can be identified in sysent for dynamic call
|
|
* number assignment for a limited number of calls.
|
|
*
|
|
* Place holder for system call slots reserved for loadable modules.
|
|
*/
|
|
int
|
|
lkmnosys(p, args, retval)
|
|
struct proc *p;
|
|
struct nosys_args *args;
|
|
int *retval;
|
|
{
|
|
|
|
return(nosys(p, args, retval));
|
|
}
|
|
|
|
int
|
|
lkmexists(lkmtp)
|
|
struct lkm_table *lkmtp;
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* see if name exists...
|
|
*/
|
|
for (i = 0; i < MAXLKMS; i++) {
|
|
/*
|
|
* An unused module and the one we are testing are not
|
|
* considered.
|
|
*/
|
|
if (!lkmods[i].used || &lkmods[i] == lkmtp)
|
|
continue;
|
|
if (!strcmp(lkmtp->private.lkm_any->lkm_name,
|
|
lkmods[i].private.lkm_any->lkm_name))
|
|
return(1); /* already loaded... */
|
|
}
|
|
|
|
return(0); /* module not loaded... */
|
|
}
|
|
|
|
/*
|
|
* For the loadable system call described by the structure pointed to
|
|
* by lkmtp, load/unload/stat it depending on the cmd requested.
|
|
*/
|
|
static int
|
|
_lkm_syscall(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct lkm_syscall *args = lkmtp->private.lkm_syscall;
|
|
int i;
|
|
int err = 0;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return(EEXIST);
|
|
if ((i = args->lkm_offset) == -1) { /* auto */
|
|
/*
|
|
* Search the table looking for a slot...
|
|
*/
|
|
for (i = 0; i < aout_sysvec.sv_size; i++)
|
|
if (aout_sysvec.sv_table[i].sy_call ==
|
|
(sy_call_t *)lkmnosys)
|
|
break; /* found it! */
|
|
/* out of allocable slots? */
|
|
if (i == aout_sysvec.sv_size) {
|
|
err = ENFILE;
|
|
break;
|
|
}
|
|
} else { /* assign */
|
|
if (i < 0 || i >= aout_sysvec.sv_size) {
|
|
err = EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* save old */
|
|
bcopy(&aout_sysvec.sv_table[i],
|
|
&(args->lkm_oldent),
|
|
sizeof(struct sysent));
|
|
|
|
/* replace with new */
|
|
bcopy(args->lkm_sysent,
|
|
&aout_sysvec.sv_table[i],
|
|
sizeof(struct sysent));
|
|
|
|
/* done! */
|
|
args->lkm_offset = i; /* slot in sysent[] */
|
|
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
/* current slot... */
|
|
i = args->lkm_offset;
|
|
|
|
/* replace current slot contents with old contents */
|
|
bcopy(&(args->lkm_oldent),
|
|
&aout_sysvec.sv_table[i],
|
|
sizeof(struct sysent));
|
|
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return(err);
|
|
}
|
|
|
|
/*
|
|
* For the loadable virtual file system described by the structure pointed
|
|
* to by lkmtp, load/unload/stat it depending on the cmd requested.
|
|
*/
|
|
static int
|
|
_lkm_vfs(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct lkm_vfs *args = lkmtp->private.lkm_vfs;
|
|
struct vfsconf *vfc = args->lkm_vfsconf;
|
|
int i;
|
|
int err = 0;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return(EEXIST);
|
|
|
|
for(i = 0; i < MOUNT_MAXTYPE; i++) {
|
|
if(!strcmp(vfc->vfc_name, vfsconf[i]->vfc_name)) {
|
|
return EEXIST;
|
|
}
|
|
}
|
|
|
|
i = args->lkm_offset = vfc->vfc_index;
|
|
if (i < 0) {
|
|
for (i = MOUNT_MAXTYPE - 1; i >= 0; i--) {
|
|
if(vfsconf[i] == &void_vfsconf)
|
|
break;
|
|
}
|
|
}
|
|
if (i < 0) {
|
|
return EINVAL;
|
|
}
|
|
args->lkm_offset = vfc->vfc_index = i;
|
|
|
|
vfsconf[i] = vfc;
|
|
vfssw[i] = vfc->vfc_vfsops;
|
|
|
|
/* like in vfs_op_init */
|
|
for(i = 0; args->lkm_vnodeops->ls_items[i]; i++) {
|
|
const struct vnodeopv_desc *opv =
|
|
args->lkm_vnodeops->ls_items[i];
|
|
*(opv->opv_desc_vector_p) = NULL;
|
|
}
|
|
vfs_opv_init((struct vnodeopv_desc **)args->lkm_vnodeops->ls_items);
|
|
|
|
/*
|
|
* Call init function for this VFS...
|
|
*/
|
|
(*(vfssw[vfc->vfc_index]->vfs_init))();
|
|
|
|
/* done! */
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
/* current slot... */
|
|
i = args->lkm_offset;
|
|
|
|
if (vfsconf[i]->vfc_refcount) {
|
|
return EBUSY;
|
|
}
|
|
|
|
/* replace current slot contents with old contents */
|
|
vfssw[i] = (struct vfsops *)0;
|
|
vfsconf[i] = &void_vfsconf;
|
|
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
return(err);
|
|
}
|
|
|
|
/*
|
|
* For the loadable device driver described by the structure pointed to
|
|
* by lkmtp, load/unload/stat it depending on the cmd requested.
|
|
*/
|
|
static int
|
|
_lkm_dev(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct lkm_dev *args = lkmtp->private.lkm_dev;
|
|
int i;
|
|
dev_t descrip;
|
|
int err = 0;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return(EEXIST);
|
|
switch(args->lkm_devtype) {
|
|
case LM_DT_BLOCK:
|
|
if ((i = args->lkm_offset) == -1)
|
|
descrip = (dev_t) -1;
|
|
else
|
|
descrip = makedev(args->lkm_offset,0);
|
|
if ( err = bdevsw_add(&descrip, args->lkm_dev.bdev,
|
|
&(args->lkm_olddev.bdev))) {
|
|
break;
|
|
}
|
|
args->lkm_offset = major(descrip) ;
|
|
break;
|
|
|
|
case LM_DT_CHAR:
|
|
break;
|
|
|
|
default:
|
|
err = ENODEV;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
/* current slot... */
|
|
i = args->lkm_offset;
|
|
|
|
switch(args->lkm_devtype) {
|
|
case LM_DT_BLOCK:
|
|
/* replace current slot contents with old contents */
|
|
descrip = makedev(i,0);
|
|
bdevsw_add(&descrip, args->lkm_olddev.bdev,NULL);
|
|
break;
|
|
|
|
case LM_DT_CHAR:
|
|
/* replace current slot contents with old contents */
|
|
cdevsw_add(&descrip, args->lkm_olddev.cdev,NULL);
|
|
break;
|
|
|
|
default:
|
|
err = ENODEV;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return(err);
|
|
}
|
|
|
|
#ifdef STREAMS
|
|
/*
|
|
* For the loadable streams module described by the structure pointed to
|
|
* by lkmtp, load/unload/stat it depending on the cmd requested.
|
|
*/
|
|
static int
|
|
_lkm_strmod(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct lkm_strmod *args = lkmtp->private.lkm_strmod;
|
|
int i;
|
|
int err = 0;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return(EEXIST);
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return(err);
|
|
}
|
|
#endif /* STREAMS */
|
|
|
|
/*
|
|
* For the loadable execution class described by the structure pointed to
|
|
* by lkmtp, load/unload/stat it depending on the cmd requested.
|
|
*/
|
|
static int
|
|
_lkm_exec(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct lkm_exec *args = lkmtp->private.lkm_exec;
|
|
int i;
|
|
int err = 0;
|
|
const struct execsw **execsw =
|
|
(const struct execsw **)&execsw_set.ls_items[0];
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return(EEXIST);
|
|
if ((i = args->lkm_offset) == -1) { /* auto */
|
|
/*
|
|
* Search the table looking for a slot...
|
|
*/
|
|
for (i = 0; execsw[i] != NULL; i++)
|
|
if (execsw[i]->ex_imgact == NULL)
|
|
break; /* found it! */
|
|
/* out of allocable slots? */
|
|
if (execsw[i] == NULL) {
|
|
err = ENFILE;
|
|
break;
|
|
}
|
|
} else { /* assign */
|
|
err = EINVAL;
|
|
break;
|
|
}
|
|
|
|
/* save old */
|
|
bcopy(&execsw[i], &(args->lkm_oldexec), sizeof(struct execsw*));
|
|
|
|
/* replace with new */
|
|
bcopy(&(args->lkm_exec), &execsw[i], sizeof(struct execsw*));
|
|
|
|
/* done! */
|
|
args->lkm_offset = i; /* slot in execsw[] */
|
|
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
/* current slot... */
|
|
i = args->lkm_offset;
|
|
|
|
/* replace current slot contents with old contents */
|
|
bcopy(&(args->lkm_oldexec), &execsw[i], sizeof(struct execsw*));
|
|
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
return(err);
|
|
}
|
|
|
|
/* XXX: This is bogus. we should find a better method RSN! */
|
|
static const struct execsw lkm_exec_dummy1 = { NULL, "lkm" };
|
|
static const struct execsw lkm_exec_dummy2 = { NULL, "lkm" };
|
|
static const struct execsw lkm_exec_dummy3 = { NULL, "lkm" };
|
|
static const struct execsw lkm_exec_dummy4 = { NULL, "lkm" };
|
|
TEXT_SET(execsw_set, lkm_exec_dummy1);
|
|
TEXT_SET(execsw_set, lkm_exec_dummy2);
|
|
TEXT_SET(execsw_set, lkm_exec_dummy3);
|
|
TEXT_SET(execsw_set, lkm_exec_dummy4);
|
|
|
|
/*
|
|
* This code handles the per-module type "wiring-in" of loadable modules
|
|
* into existing kernel tables. For "LM_MISC" modules, wiring and unwiring
|
|
* is assumed to be done in their entry routines internal to the module
|
|
* itself.
|
|
*/
|
|
int
|
|
lkmdispatch(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
int err = 0; /* default = success */
|
|
|
|
switch(lkmtp->private.lkm_any->lkm_type) {
|
|
case LM_SYSCALL:
|
|
err = _lkm_syscall(lkmtp, cmd);
|
|
break;
|
|
|
|
case LM_VFS:
|
|
err = _lkm_vfs(lkmtp, cmd);
|
|
break;
|
|
|
|
case LM_DEV:
|
|
err = _lkm_dev(lkmtp, cmd);
|
|
break;
|
|
|
|
#ifdef STREAMS
|
|
case LM_STRMOD:
|
|
{
|
|
struct lkm_strmod *args = lkmtp->private.lkm_strmod;
|
|
}
|
|
break;
|
|
|
|
#endif /* STREAMS */
|
|
|
|
case LM_EXEC:
|
|
err = _lkm_exec(lkmtp, cmd);
|
|
break;
|
|
|
|
case LM_MISC: /* ignore content -- no "misc-specific" procedure */
|
|
if (lkmexists(lkmtp))
|
|
err = EEXIST;
|
|
break;
|
|
|
|
default:
|
|
err = ENXIO; /* unknown type */
|
|
break;
|
|
}
|
|
|
|
return(err);
|
|
}
|
|
|
|
int
|
|
lkm_nullcmd(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
static lkm_devsw_installed = 0;
|
|
#ifdef DEVFS
|
|
static void *lkmc_devfs_token;
|
|
#endif
|
|
|
|
static void lkm_drvinit(void *unused)
|
|
{
|
|
dev_t dev;
|
|
|
|
if( ! lkm_devsw_installed ) {
|
|
dev = makedev(CDEV_MAJOR, 0);
|
|
cdevsw_add(&dev,&lkmc_cdevsw, NULL);
|
|
lkm_devsw_installed = 1;
|
|
#ifdef DEVFS
|
|
lkmc_devfs_token = devfs_add_devswf(&lkmc_cdevsw, 0, DV_CHR,
|
|
UID_ROOT, GID_WHEEL, 0644,
|
|
"lkm");
|
|
#endif
|
|
}
|
|
}
|
|
|
|
SYSINIT(lkmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,lkm_drvinit,NULL)
|
|
|
|
|