839 lines
18 KiB
C
839 lines
18 KiB
C
/*-
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* Copyright (c) 1992 Terrence R. Lambert.
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* Copyright (c) 1994 Christopher G. Demetriou
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* 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
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* 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 1.60 1999/01/17 19:00:58 peter Exp $
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*/
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#include "opt_devfs.h"
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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/tty.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/kernel.h>
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#include <sys/mount.h>
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#include <sys/sysctl.h>
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#include <sys/sysent.h>
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#include <sys/exec.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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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_extern.h>
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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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#ifndef MAXLKMS
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#define MAXLKMS 20
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#endif
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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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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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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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#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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seltrue, nommap, NULL, "lkm", NULL, -1 };
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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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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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return(0); /* pseudo-device closed */
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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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u_long 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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{
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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;
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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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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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}
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curp = &lkmods[i];
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curp->id = i; /* self reference slot offset */
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resrvp->slot = i; /* return slot */
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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%08lx)\n", curp->area);
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printf("LKM: LMRESERV (adjusted = 0x%08lx)\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)(uintptr_t)(curp->area + curp->offset), i);
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if (err)
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break;
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if ((curp->offset + i) < curp->size) {
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lkm_state = LKMS_LOADING;
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#ifdef DEBUG
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printf(
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"LKM: LMLOADBUF (loading @ %lu of %lu, i = %d)\n",
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curp->offset, curp->size, i);
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#endif /* DEBUG */
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} else {
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lkm_state = LKMS_LOADED;
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#ifdef DEBUG
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printf("LKM: LMLOADBUF (loaded)\n");
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#endif /* DEBUG */
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}
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curp->offset += i;
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break;
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case LMUNRESRV: /* discard reserved 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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lkmunreserve(); /* coerce state to LKM_IDLE */
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#ifdef DEBUG
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printf("LKM: LMUNRESERV\n");
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#endif /* DEBUG */
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break;
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case LMREADY: /* module loaded: call entry */
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if ((flag & FWRITE) == 0 || securelevel > 0)
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/* only allow this if writing or insecure */
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return EPERM;
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switch (lkm_state) {
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case LKMS_LOADED:
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break;
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case LKMS_LOADING:
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/* The remainder must be bss, so we clear it */
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bzero((caddr_t)(uintptr_t)(curp->area + curp->offset),
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curp->size - curp->offset);
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break;
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default:
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#ifdef DEBUG
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printf("lkm_state is %02x\n", lkm_state);
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#endif /* DEBUG */
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return ENXIO;
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}
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/* XXX gack */
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curp->entry = (int (*) __P((struct lkm_table *, int, int)))
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(*(uintfptr_t *)data);
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/* call entry(load)... (assigns "private" portion) */
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err = (*(curp->entry))(curp, LKM_E_LOAD, LKM_VERSION);
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if (err) {
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/*
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* Module may refuse loading or may have a
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* version mismatch...
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*/
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lkm_state = LKMS_UNLOADING; /* for lkmunreserve */
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lkmunreserve(); /* free memory */
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curp->used = 0; /* free slot */
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break;
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}
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/*
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* It's possible for a user to load a module that doesn't
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* initialize itself correctly. (You can even get away with
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* using it for a while.) Unfortunately, we are faced with
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* the following problems:
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* - we can't tell a good module from a bad one until
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* after we've run its entry function (if the private
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* section is uninitalized after we return from the
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* entry, then something's fishy)
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* - now that we've called the entry function, we can't
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* forcibly unload the module without risking a crash
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* - since we don't know what the module's entry function
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* did, we can't easily clean up the mess it may have
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* made, so we can't know just how unstable the system
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* may be
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* So, being stuck between a rock and a hard place, we
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* have no choice but to do this...
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*/
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if (curp->private.lkm_any == NULL)
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panic("loadable module initialization failed");
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curp->used = 1;
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#ifdef DEBUG
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printf("LKM: LMREADY\n");
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#endif /* DEBUG */
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lkm_state = LKMS_IDLE;
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break;
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case LMUNLOAD: /* unload 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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unloadp = (struct lmc_unload *)data;
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if ((i = unloadp->id) == -1) { /* unload by name */
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/*
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* Copy name and lookup id from all loaded
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* modules. May fail.
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*/
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err =copyinstr(unloadp->name, istr, MAXLKMNAME-1, NULL);
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if (err)
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break;
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/*
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* look up id...
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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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continue;
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if (!strcmp(istr,
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lkmods[i].private.lkm_any->lkm_name))
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break;
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}
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}
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/*
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* Range check the value; on failure, return EINVAL
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*/
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if (i < 0 || i >= MAXLKMS) {
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err = EINVAL;
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break;
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}
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curp = &lkmods[i];
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if (!curp->used) {
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err = ENOENT;
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break;
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}
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/* call entry(unload) */
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if ((*(curp->entry))(curp, LKM_E_UNLOAD, LKM_VERSION)) {
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err = EBUSY;
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break;
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}
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lkm_state = LKMS_UNLOADING; /* non-idle for lkmunreserve */
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lkmunreserve(); /* free memory */
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curp->used = 0; /* free slot */
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break;
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case LMSTAT: /* stat a module by id/name */
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/* allow readers and writers to stat */
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statp = (struct lmc_stat *)data;
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if ((i = statp->id) == -1) { /* stat by name */
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/*
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* Copy name and lookup id from all loaded
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* modules.
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*/
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copystr(statp->name, istr, MAXLKMNAME-1, NULL);
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/*
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* look up id...
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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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continue;
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if (!strcmp(istr,
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lkmods[i].private.lkm_any->lkm_name))
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break;
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}
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if (i == MAXLKMS) { /* Not found */
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err = ENOENT;
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break;
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}
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}
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/*
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* Range check the value; on failure, return EINVAL
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*/
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if (i < 0 || i >= MAXLKMS) {
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err = EINVAL;
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break;
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}
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curp = &lkmods[i];
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if (!curp->used) { /* Not found */
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err = ENOENT;
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break;
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}
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/*
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* Copy out stat information for this module...
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*/
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statp->id = curp->id;
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statp->offset = curp->private.lkm_any->lkm_offset;
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statp->type = curp->private.lkm_any->lkm_type;
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statp->area = curp->area;
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statp->size = curp->size / PAGESIZE;
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statp->private = (uintptr_t)curp->private.lkm_any;
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statp->ver = curp->private.lkm_any->lkm_ver;
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copystr(curp->private.lkm_any->lkm_name,
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statp->name,
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MAXLKMNAME - 2,
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NULL);
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break;
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default: /* bad ioctl()... */
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err = ENOTTY;
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break;
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}
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return (err);
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}
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int
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lkmexists(lkmtp)
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struct lkm_table *lkmtp;
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{
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int i;
|
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/*
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* see if name exists...
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*/
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for (i = 0; i < MAXLKMS; i++) {
|
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/*
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* An unused module and the one we are testing are not
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* considered.
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*/
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if (!lkmods[i].used || &lkmods[i] == lkmtp)
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continue;
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if (!strcmp(lkmtp->private.lkm_any->lkm_name,
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lkmods[i].private.lkm_any->lkm_name))
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return(1); /* already loaded... */
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}
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return(0); /* module not loaded... */
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}
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|
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/*
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* For the loadable system call described by the structure pointed to
|
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* by lkmtp, load/unload/stat it depending on the cmd requested.
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*/
|
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static int
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_lkm_syscall(lkmtp, cmd)
|
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struct lkm_table *lkmtp;
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int cmd;
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|
{
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struct lkm_syscall *args = lkmtp->private.lkm_syscall;
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int i;
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int err = 0;
|
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|
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switch(cmd) {
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case LKM_E_LOAD:
|
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/* don't load twice! */
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if (lkmexists(lkmtp))
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return(EEXIST);
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|
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if (args->lkm_offset == LKM_ANON)
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i = NO_SYSCALL;
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else
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i = args->lkm_offset;
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err = syscall_register(&i, args->lkm_sysent,
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&(args->lkm_oldent));
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if (err)
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return(err);
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|
|
/* done! */
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args->lkm_offset = i; /* slot in sysent[] */
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break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
/* current slot... */
|
|
i = args->lkm_offset;
|
|
|
|
err = syscall_deregister(&i, &(args->lkm_oldent));
|
|
if (err)
|
|
return(err);
|
|
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 error, i;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return(EEXIST);
|
|
|
|
for(i = 0; args->lkm_vnodeops->ls_items[i]; i++)
|
|
vfs_add_vnodeops((const void*)args->lkm_vnodeops->ls_items[i]);
|
|
error = vfs_register(vfc);
|
|
if (error)
|
|
return(error);
|
|
|
|
args->lkm_offset = vfc->vfc_typenum;
|
|
|
|
/* done! */
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
/* current slot... */
|
|
i = args->lkm_offset;
|
|
|
|
error = vfs_unregister(vfc);
|
|
if (error)
|
|
return(error);
|
|
|
|
for(i = 0; args->lkm_vnodeops->ls_items[i]; i++)
|
|
vfs_rm_vnodeops((const void*)args->lkm_vnodeops->ls_items[i]);
|
|
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* 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_CHAR:
|
|
if ((i = args->lkm_offset) == LKM_ANON)
|
|
descrip = (dev_t) -1;
|
|
else
|
|
descrip = makedev(args->lkm_offset,0);
|
|
if ((err = cdevsw_add(&descrip, args->lkm_dev.cdev,
|
|
&(args->lkm_olddev.cdev))) != 0) {
|
|
break;
|
|
}
|
|
args->lkm_offset = major(descrip) ;
|
|
break;
|
|
|
|
default:
|
|
err = ENODEV;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
/* current slot... */
|
|
i = args->lkm_offset;
|
|
descrip = makedev(i,0);
|
|
|
|
switch(args->lkm_devtype) {
|
|
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 err = 0;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return(EEXIST);
|
|
if (args->lkm_offset != LKM_ANON) { /* auto */
|
|
err = EINVAL;
|
|
break;
|
|
}
|
|
|
|
err = exec_register(args->lkm_exec);
|
|
|
|
/* done! */
|
|
args->lkm_offset = 0;
|
|
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
|
|
err = exec_unregister(args->lkm_exec);
|
|
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
return(err);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
#ifdef DEVFS
|
|
static void *lkmc_devfs_token;
|
|
#endif
|
|
|
|
static int
|
|
lkm_modevent(module_t mod, int type, void *data)
|
|
{
|
|
dev_t dev;
|
|
static struct cdevsw *oldcdevsw;
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
dev = makedev(CDEV_MAJOR, 0);
|
|
cdevsw_add(&dev, &lkmc_cdevsw, &oldcdevsw);
|
|
#ifdef DEVFS
|
|
lkmc_devfs_token = devfs_add_devswf(&lkmc_cdevsw, 0, DV_CHR,
|
|
UID_ROOT, GID_WHEEL, 0644,
|
|
"lkm");
|
|
#endif
|
|
break;
|
|
case MOD_UNLOAD:
|
|
#ifdef DEVFS
|
|
devfs_remove_dev(lkmc_devfs_token);
|
|
#endif
|
|
cdevsw_add(&dev, oldcdevsw, NULL);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
static moduledata_t lkm_mod = {
|
|
"lkm",
|
|
lkm_modevent,
|
|
NULL
|
|
};
|
|
DECLARE_MODULE(lkm, lkm_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR);
|