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/*
* Copyright (C) 1993-2001 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*/
/*
* 29/12/94 Added code from Marc Huber <huber@fzi.de> to allow it to allocate
* its own major char number! Way cool patch!
*/
#include <sys/param.h>
/*
* Post NetBSD 1.2 has the PFIL interface for packet filters. This turns
* on those hooks. We don't need any special mods with this!
*/
#if (defined(NetBSD) && (NetBSD > 199609) && (NetBSD <= 1991011)) || \
(defined(NetBSD1_2) && NetBSD1_2 > 1)
# define NETBSD_PF
#endif
#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"
#if !defined(__NetBSD_Version__) || __NetBSD_Version__ < 103050000
#define vn_lock(v,f) VOP_LOCK(v)
#endif
#if !defined(VOP_LEASE) && defined(LEASE_CHECK)
#define VOP_LEASE LEASE_CHECK
#endif
#ifndef MIN
#define MIN(a,b) (((a)<(b))?(a):(b))
#endif
extern int lkmenodev __P((void));
#if (NetBSD >= 199706) || (defined(OpenBSD) && (OpenBSD >= 200211))
int if_ipl_lkmentry __P((struct lkm_table *, int, int));
#else
#if defined(OpenBSD)
int if_ipl __P((struct lkm_table *, int, int));
#else
int xxxinit __P((struct lkm_table *, int, int));
#endif
#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, IPL_NAT, IPL_STATE, IPL_AUTH,
NULL };
#if (defined(NetBSD1_0) && (NetBSD1_0 > 1)) || \
(defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199511))
# if defined(__NetBSD__) && (__NetBSD_Version__ >= 106080000)
extern const struct cdevsw ipl_cdevsw;
# else
struct cdevsw ipldevsw =
{
iplopen, /* open */
iplclose, /* close */
iplread, /* read */
0, /* write */
iplioctl, /* ioctl */
0, /* stop */
0, /* tty */
0, /* select */
0, /* mmap */
NULL /* strategy */
};
# endif
#else
struct cdevsw ipldevsw =
{
iplopen, /* open */
iplclose, /* close */
iplread, /* read */
(void *)nullop, /* write */
iplioctl, /* ioctl */
(void *)nullop, /* stop */
#ifndef OpenBSD
(void *)nullop, /* reset */
#endif
(void *)NULL, /* tty */
(void *)nullop, /* select */
(void *)nullop, /* mmap */
NULL /* strategy */
};
#endif
int ipl_major = 0;
#if defined(__NetBSD__) && (__NetBSD_Version__ >= 106080000)
MOD_DEV(IPL_VERSION, "ipl", NULL, -1, &ipl_cdevsw, -1);
#else
MOD_DEV(IPL_VERSION, LM_DT_CHAR, -1, &ipldevsw);
#endif
extern int vd_unuseddev __P((void));
extern struct cdevsw cdevsw[];
extern int nchrdev;
#if (NetBSD >= 199706) || (defined(OpenBSD) && (OpenBSD >= 200211))
int if_ipl_lkmentry(lkmtp, cmd, ver)
#else
#if defined(OpenBSD)
int if_ipl(lkmtp, cmd, ver)
#else
int xxxinit(lkmtp, cmd, ver)
#endif
#endif
struct lkm_table *lkmtp;
int cmd, ver;
{
DISPATCH(lkmtp, cmd, ver, iplaction, iplaction, iplaction);
}
#ifdef OpenBSD
int lkmexists __P((struct lkm_table *)); /* defined in /sys/kern/kern_lkm.c */
#endif
static int iplaction(lkmtp, cmd)
struct lkm_table *lkmtp;
int cmd;
{
struct lkm_dev *args = lkmtp->private.lkm_dev;
int err = 0;
#if !defined(__NetBSD__) || (__NetBSD_Version__ < 106080000)
int i;
#endif
switch (cmd)
{
case LKM_E_LOAD :
if (lkmexists(lkmtp))
return EEXIST;
#if !defined(__NetBSD__) || (__NetBSD_Version__ < 106080000)
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[] */
#else
err = devsw_attach(args->lkm_devname,
args->lkm_bdev, &args->lkm_bdevmaj,
args->lkm_cdev, &args->lkm_cdevmaj);
if (err != 0)
return (err);
ipl_major = args->lkm_cdevmaj;
#endif
printf("IP Filter: loaded into slot %d\n", ipl_major);
return ipl_load();
case LKM_E_UNLOAD :
#if defined(__NetBSD__) && (__NetBSD_Version__ >= 106080000)
devsw_detach(args->lkm_bdev, args->lkm_cdev);
args->lkm_bdevmaj = -1;
args->lkm_cdevmaj = -1;
#endif
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()
{
char *name;
struct nameidata nd;
int error, i;
for (i = 0; (name = ipf_devfiles[i]); i++) {
NDINIT(&nd, DELETE, LOCKPARENT, UIO_SYSSPACE, name, curproc);
if ((error = namei(&nd)))
return (error);
VOP_LEASE(nd.ni_vp, curproc, curproc->p_ucred, LEASE_WRITE);
#ifdef OpenBSD
VOP_LOCK(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY, curproc);
#else
# if !defined(__NetBSD_Version__) || (__NetBSD_Version__ < 106000000)
vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
# endif
#endif
VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
(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 defined(__NetBSD__)
error = ipl_disable();
#else
error = ipldetach();
#endif
if (!error)
error = ipl_remove();
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 = ipl_enable();
if (error)
return error;
for (i = 0; (name = ipf_devfiles[i]); i++) {
NDINIT(&nd, CREATE, LOCKPARENT, UIO_SYSSPACE, name, curproc);
if ((error = namei(&nd)))
return error;
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);
return (EEXIST);
}
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)
return error;
}
return error;
}
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