958 lines
20 KiB
C
958 lines
20 KiB
C
/* $NetBSD: kern_lkm.c,v 1.39 1997/07/21 05:43:36 mrg Exp $ */
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/*
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* Copyright (c) 1994 Christopher G. Demetriou
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* Copyright (c) 1992 Terrence R. Lambert.
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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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/*
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* XXX it's not really safe to unload *any* of the types which are
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* currently loadable; e.g. you could unload a syscall which was being
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* blocked in, etc. In the long term, a solution should be come up
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* with, but "not right now." -- cgd
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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/ioctl.h>
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#include <sys/tty.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/vnode.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/exec.h>
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#include <sys/syscallargs.h>
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#include <sys/conf.h>
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#include <sys/lkm.h>
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#include <sys/syscall.h>
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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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#if !defined(DEBUG) && defined(LKMDEBUG)
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# define DEBUG
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#endif
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#ifdef DEBUG
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# define LKMDB_INFO 0x01
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# define LKMDB_LOAD 0x02
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int lkmdebug = 0;
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#endif
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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 void lkmunreserve __P((void));
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static int _lkm_syscall __P((struct lkm_table *, int));
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static int _lkm_vfs __P((struct lkm_table *, int));
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static int _lkm_dev __P((struct lkm_table *, int));
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#ifdef STREAMS
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static int _lkm_strmod __P((struct lkm_table *, int));
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#endif
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static int _lkm_exec __P((struct lkm_table *, int));
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/*ARGSUSED*/
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int
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lkmopen(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(kmem_map, curp->area, curp->size);/**/
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curp->area = 0;
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}
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lkm_state = LKMS_IDLE;
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}
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int
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lkmclose(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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if (lkmdebug & LKMDB_INFO)
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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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int
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lkmioctl(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 error = 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 (securelevel > 0)
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return EPERM;
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if ((flag & FWRITE) == 0) /* only allow this if writing */
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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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error = 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(kmem_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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if (lkmdebug & LKMDB_INFO) {
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printf("LKM: LMRESERV (actual = 0x%08lx)\n",
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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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}
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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 (securelevel > 0)
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return EPERM;
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if ((flag & FWRITE) == 0) /* only allow this if writing */
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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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error = ENOMEM;
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break;
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}
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/* copy in buffer full of data */
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error = copyin(loadbufp->data,
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(caddr_t)curp->area + curp->offset, i);
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if (error)
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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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if (lkmdebug & LKMDB_LOAD)
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printf("LKM: LMLOADBUF (loading @ %ld of %ld, 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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if (lkmdebug & LKMDB_LOAD)
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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 (securelevel > 0)
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return EPERM;
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if ((flag & FWRITE) == 0) /* only allow this if writing */
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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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if (lkmdebug & LKMDB_INFO)
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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 (securelevel > 0)
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return EPERM;
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if ((flag & FWRITE) == 0) /* only allow this if writing */
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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)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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if (lkmdebug & LKMDB_INFO)
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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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curp->entry = (int (*) __P((struct lkm_table *, int, int)))
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(*((long *) (data)));
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/* call entry(load)... (assigns "private" portion) */
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error = (*(curp->entry))(curp, LKM_E_LOAD, LKM_VERSION);
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if (error) {
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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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curp->used = 1;
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#ifdef DEBUG
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if (lkmdebug & LKMDB_INFO)
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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 (securelevel > 0)
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return EPERM;
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if ((flag & FWRITE) == 0) /* only allow this if writing */
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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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error = copyinstr(unloadp->name, istr, MAXLKMNAME-1,
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NULL);
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if (error)
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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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error = 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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error = 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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error = 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, (size_t *)0);
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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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error = 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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error = 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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error = 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 = (unsigned long)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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(size_t *)0);
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break;
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default: /* bad ioctl()... */
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error = ENOTTY;
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break;
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}
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return (error);
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}
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/*
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* Acts like "nosys" but can be identified in sysent for dynamic call
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* number assignment for a limited number of calls.
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*
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* Place holder for system call slots reserved for loadable modules.
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*/
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int
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sys_lkmnosys(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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return (sys_nosys(p, v, retval));
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}
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/*
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* Acts like "enodev", but can be identified in cdevsw and bdevsw for
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* dynamic driver major number assignment for a limited number of
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* drivers.
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*
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* Place holder for device switch slots reserved for loadable modules.
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*/
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int
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lkmenodev()
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{
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return (enodev());
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}
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/*
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* A placeholder function for load/unload/stat calls; simply returns zero.
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* Used where people don't want to specify a special function.
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*/
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int
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lkm_nofunc(lkmtp, cmd)
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struct lkm_table *lkmtp;
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int cmd;
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{
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return (0);
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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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* 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 error = 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 < SYS_MAXSYSCALL; i++)
|
|
if (sysent[i].sy_call == sys_lkmnosys)
|
|
break; /* found it! */
|
|
/* out of allocable slots? */
|
|
if (i == SYS_MAXSYSCALL) {
|
|
error = ENFILE;
|
|
break;
|
|
}
|
|
} else { /* assign */
|
|
if (i < 0 || i >= SYS_MAXSYSCALL) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* save old */
|
|
bcopy(&sysent[i], &args->lkm_oldent, sizeof(struct sysent));
|
|
|
|
/* replace with new */
|
|
bcopy(args->lkm_sysent, &sysent[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, &sysent[i], sizeof(struct sysent));
|
|
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
int i;
|
|
int error = 0;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return (EEXIST);
|
|
|
|
/* make sure there's no VFS in the table with this name */
|
|
for (i = 0; i < nvfssw; i++)
|
|
if (vfssw[i] != (struct vfsops *)0 &&
|
|
strncmp(vfssw[i]->vfs_name,
|
|
args->lkm_vfsops->vfs_name,
|
|
MFSNAMELEN) == 0)
|
|
return (EEXIST);
|
|
|
|
/* pick the last available empty slot */
|
|
for (i = nvfssw - 1; i >= 0; i--)
|
|
if (vfssw[i] == (struct vfsops *)0)
|
|
break;
|
|
if (i == -1) { /* or if none, punt */
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Set up file system
|
|
*/
|
|
vfssw[i] = args->lkm_vfsops;
|
|
vfssw[i]->vfs_refcount = 0;
|
|
|
|
/*
|
|
* Call init function for this VFS...
|
|
*/
|
|
(*(vfssw[i]->vfs_init))();
|
|
|
|
/* done! */
|
|
args->lkm_offset = i; /* slot in vfssw[] */
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
/* current slot... */
|
|
i = args->lkm_offset;
|
|
|
|
if (vfssw[i]->vfs_refcount != 0)
|
|
return (EBUSY);
|
|
|
|
/* replace current slot contents with old contents */
|
|
vfssw[i] = (struct vfsops *)0;
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
int error = 0;
|
|
extern int nblkdev, nchrdev; /* from conf.c */
|
|
|
|
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) { /* auto */
|
|
/*
|
|
* Search the table looking for a slot...
|
|
*/
|
|
for (i = 0; i < nblkdev; i++)
|
|
if (bdevsw[i].d_open ==
|
|
(dev_type_open((*))) lkmenodev)
|
|
break; /* found it! */
|
|
/* out of allocable slots? */
|
|
if (i == nblkdev) {
|
|
error = ENFILE;
|
|
break;
|
|
}
|
|
} else { /* assign */
|
|
if (i < 0 || i >= nblkdev) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* save old */
|
|
bcopy(&bdevsw[i], &args->lkm_olddev.bdev, sizeof(struct bdevsw));
|
|
|
|
/* replace with new */
|
|
bcopy(args->lkm_dev.bdev, &bdevsw[i], sizeof(struct bdevsw));
|
|
|
|
/* done! */
|
|
args->lkm_offset = i; /* slot in bdevsw[] */
|
|
break;
|
|
|
|
case LM_DT_CHAR:
|
|
if ((i = args->lkm_offset) == -1) { /* auto */
|
|
/*
|
|
* Search the table looking for a slot...
|
|
*/
|
|
for (i = 0; i < nchrdev; i++)
|
|
if (cdevsw[i].d_open ==
|
|
(dev_type_open((*))) lkmenodev)
|
|
break; /* found it! */
|
|
/* out of allocable slots? */
|
|
if (i == nchrdev) {
|
|
error = ENFILE;
|
|
break;
|
|
}
|
|
} else { /* assign */
|
|
if (i < 0 || i >= nchrdev) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* save old */
|
|
bcopy(&cdevsw[i], &args->lkm_olddev.cdev, sizeof(struct cdevsw));
|
|
|
|
/* replace with new */
|
|
bcopy(args->lkm_dev.cdev, &cdevsw[i], sizeof(struct cdevsw));
|
|
|
|
/* done! */
|
|
args->lkm_offset = i; /* slot in cdevsw[] */
|
|
|
|
break;
|
|
|
|
default:
|
|
error = 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 */
|
|
bcopy(&args->lkm_olddev.bdev, &bdevsw[i], sizeof(struct bdevsw));
|
|
break;
|
|
|
|
case LM_DT_CHAR:
|
|
/* replace current slot contents with old contents */
|
|
bcopy(&args->lkm_olddev.cdev, &cdevsw[i], sizeof(struct cdevsw));
|
|
break;
|
|
|
|
default:
|
|
error = ENODEV;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
#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 error = 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 (error);
|
|
}
|
|
#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 error = 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 < nexecs; i++)
|
|
if (execsw[i].es_check == NULL)
|
|
break; /* found it! */
|
|
/* out of allocable slots? */
|
|
if (i == nexecs) {
|
|
error = ENFILE;
|
|
break;
|
|
}
|
|
} else { /* assign */
|
|
if (i < 0 || i >= nexecs) {
|
|
error = 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));
|
|
|
|
/* realize need to recompute max header size */
|
|
exec_maxhdrsz = 0;
|
|
|
|
/* 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));
|
|
|
|
/* realize need to recompute max header size */
|
|
exec_maxhdrsz = 0;
|
|
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* 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 error = 0; /* default = success */
|
|
|
|
switch(lkmtp->private.lkm_any->lkm_type) {
|
|
case LM_SYSCALL:
|
|
error = _lkm_syscall(lkmtp, cmd);
|
|
break;
|
|
|
|
case LM_VFS:
|
|
error = _lkm_vfs(lkmtp, cmd);
|
|
break;
|
|
|
|
case LM_DEV:
|
|
error = _lkm_dev(lkmtp, cmd);
|
|
break;
|
|
|
|
#ifdef STREAMS
|
|
case LM_STRMOD:
|
|
{
|
|
struct lkm_strmod *args = lkmtp->private.lkm_strmod;
|
|
}
|
|
break;
|
|
|
|
#endif /* STREAMS */
|
|
|
|
case LM_EXEC:
|
|
error = _lkm_exec(lkmtp, cmd);
|
|
break;
|
|
|
|
case LM_MISC: /* ignore content -- no "misc-specific" procedure */
|
|
break;
|
|
|
|
default:
|
|
error = ENXIO; /* unknown type */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|