NetBSD/dist/ipf/mlo_ipl.c

257 lines
5.4 KiB
C

/* $NetBSD: mlo_ipl.c,v 1.1.1.2 2005/02/08 06:53:03 martti Exp $ */
/*
* Copyright (C) 1993-2001 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/exec.h>
#include <sys/mbuf.h>
#include <net/if.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <net/route.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcpip.h>
#include <sys/lkm.h>
#include "ipl.h"
#include "ip_compat.h"
#include "ip_fil.h"
#define vn_lock(v,f) VOP_LOCK(v)
#if !defined(VOP_LEASE) && defined(LEASE_CHECK)
#define VOP_LEASE LEASE_CHECK
#endif
extern int lkmenodev __P((void));
#if OpenBSD >= 200311
int if_ipl_lkmentry __P((struct lkm_table *, int, int));
#else
int if_ipl __P((struct lkm_table *, int, int));
#endif
static int ipl_unload __P((void));
static int ipl_load __P((void));
static int ipl_remove __P((void));
static int iplaction __P((struct lkm_table *, int));
static char *ipf_devfiles[] = { IPL_NAME, IPNAT_NAME, IPSTATE_NAME,
IPAUTH_NAME, IPSYNC_NAME, IPSCAN_NAME,
IPLOOKUP_NAME, NULL };
struct cdevsw ipldevsw =
{
iplopen, /* open */
iplclose, /* close */
iplread, /* read */
iplwrite, /* write */
iplioctl, /* ioctl */
(void *)nullop, /* stop */
(void *)NULL, /* tty */
(void *)nullop, /* select */
(void *)nullop, /* mmap */
NULL /* strategy */
};
int ipl_major = 0;
MOD_DEV(IPL_VERSION, LM_DT_CHAR, -1, &ipldevsw);
extern int vd_unuseddev __P((void));
extern struct cdevsw cdevsw[];
extern int nchrdev;
#if OpenBSD >= 200311
int if_ipl_lkmentry (lkmtp, cmd, ver)
#else
int if_ipl(lkmtp, cmd, ver)
#endif
struct lkm_table *lkmtp;
int cmd, ver;
{
DISPATCH(lkmtp, cmd, ver, iplaction, iplaction, iplaction);
}
int lkmexists __P((struct lkm_table *)); /* defined in /sys/kern/kern_lkm.c */
static int iplaction(lkmtp, cmd)
struct lkm_table *lkmtp;
int cmd;
{
int i;
struct lkm_dev *args = lkmtp->private.lkm_dev;
int err = 0;
switch (cmd)
{
case LKM_E_LOAD :
if (lkmexists(lkmtp))
return EEXIST;
for (i = 0; i < nchrdev; i++)
if (cdevsw[i].d_open == (dev_type_open((*)))lkmenodev ||
cdevsw[i].d_open == iplopen)
break;
if (i == nchrdev) {
printf("IP Filter: No free cdevsw slots\n");
return ENODEV;
}
ipl_major = i;
args->lkm_offset = i; /* slot in cdevsw[] */
printf("IP Filter: loaded into slot %d\n", ipl_major);
return ipl_load();
case LKM_E_UNLOAD :
err = ipl_unload();
if (!err)
printf("IP Filter: unloaded from slot %d\n",
ipl_major);
break;
case LKM_E_STAT :
break;
default:
err = EIO;
break;
}
return err;
}
static int ipl_remove()
{
struct nameidata nd;
int error, i;
char *name;
for (i = 0; (name = ipf_devfiles[i]); i++) {
#if OpenBSD >= 200311
NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_SYSSPACE,
name, curproc);
#else
NDINIT(&nd, DELETE, LOCKPARENT, UIO_SYSSPACE, name, curproc);
#endif
if ((error = namei(&nd)))
return (error);
VOP_LEASE(nd.ni_vp, curproc, curproc->p_ucred, LEASE_WRITE);
#if OpenBSD < 200311
VOP_LOCK(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY, curproc);
VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
#else
(void)uvm_vnp_uncache(nd.ni_vp);
VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
VOP_LEASE(nd.ni_vp, curproc, curproc->p_ucred, LEASE_WRITE);
#endif
(void) VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
}
return 0;
}
static int ipl_unload()
{
int error = 0;
/*
* Unloading - remove the filter rule check from the IP
* input/output stream.
*/
if (fr_refcnt)
error = EBUSY;
else if (fr_running >= 0)
error = ipldetach();
if (error == 0) {
fr_running = -2;
error = ipl_remove();
printf("%s unloaded\n", ipfilter_version);
}
return error;
}
static int ipl_load()
{
struct nameidata nd;
struct vattr vattr;
int error = 0, fmode = S_IFCHR|0600, i;
char *name;
/*
* XXX Remove existing device nodes prior to creating new ones
* XXX using the assigned LKM device slot's major number. In a
* XXX perfect world we could use the ones specified by cdevsw[].
*/
(void)ipl_remove();
error = iplattach();
for (i = 0; (error == 0) && (name = ipf_devfiles[i]); i++) {
NDINIT(&nd, CREATE, LOCKPARENT, UIO_SYSSPACE, name, curproc);
if ((error = namei(&nd)))
break;
if (nd.ni_vp != NULL) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(nd.ni_vp);
error = EEXIST;
break;
}
VATTR_NULL(&vattr);
vattr.va_type = VCHR;
vattr.va_mode = (fmode & 07777);
vattr.va_rdev = (ipl_major << 8) | i;
VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
}
if (error == 0) {
char *defpass;
if (FR_ISPASS(fr_pass))
defpass = "pass";
else if (FR_ISBLOCK(fr_pass))
defpass = "block";
else
defpass = "no-match -> block";
printf("%s initialized. Default = %s all, Logging = %s%s\n",
ipfilter_version, defpass,
#ifdef IPFILTER_LOG
"enabled",
#else
"disabled",
#endif
#ifdef IPFILTER_COMPILED
" (COMPILED)"
#else
""
#endif
);
fr_running = 1;
}
return error;
}