initial import of darren reed's ip-filter, version 3.1.2.

This commit is contained in:
mrg 1997-01-05 13:26:10 +00:00
parent 4810e839ab
commit 85f84f08cd
3 changed files with 274 additions and 0 deletions

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# $NetBSD: Makefile,v 1.1 1997/01/05 13:26:10 mrg Exp $
.include "../Makefile.inc"
.PATH: $S/netinet
KMOD= if_ipl
SRCS= ip_fil.c fil.c mln_ipl.c ip_nat.c ip_frag.c ip_state.c
NOMAN= yes
CFLAGS+= -DIPFILTER -DIPFILTER_LKM -DIPFILTER_LOG
CLEANFILES+= if_ipl
.include <bsd.kmod.mk>

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/*
* (C)opyright 1993-1996 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*
* @(#)ipl.h 1.21 6/5/96
*/
#ifndef __IPL_H_
#define __IPL_H__
#define IPL_VERSION "IP Filter v3.1.2 - 4/12/96"
#endif

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/*
* (C)opyright 1993,1994,1995 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*/
/*
* 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
#if defined(__FreeBSD__) && (__FreeBSD__ > 1)
# include <osreldate.h>
#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>
#if defined(__NetBSD__) || (defined(__FreeBSD_version) && \
(__FreeBSD_version >= 199607))
#include <net/if.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcpip.h>
#endif
#ifndef __NetBSD__
#include <sys/sysent.h>
#endif
#include <sys/lkm.h>
#include "ipl.h"
#include <netinet/ip_fil.h>
#ifndef IPL_NAME
#define IPL_NAME "/dev/ipl"
#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(), lkmexists(), lkmdispatch();
extern int iplattach(), iplopen(), iplclose(), iplioctl(), ipldetach();
#ifdef NETBSD_PF
#include <net/pfil.h>
#endif
#ifdef IPFILTER_LOG
extern int iplread();
#else
#ifdef NETBSD_PF
#define iplread enodev
#else
#define iplread nodev
#endif
#endif
extern int iplidentify();
#ifdef NETBSD_PF
int (*fr_checkp) __P((struct ip *, int, struct ifnet *, int, struct mbuf **)) = NULL;
#endif
static int ipl_unload(), ipl_load();
#if (defined(NetBSD1_0) && (NetBSD1_0 > 1)) || \
(defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199511))
struct cdevsw ipldevsw =
{
iplopen, /* open */
iplclose, /* close */
(void*)iplread, /* read */
0, /* write */
iplioctl, /* ioctl */
0, /* stop */
0, /* tty */
0, /* select */
0, /* mmap */
NULL /* strategy */
};
#else
struct cdevsw ipldevsw =
{
iplopen, /* open */
iplclose, /* close */
iplread, /* read */
(void *)nullop, /* write */
iplioctl, /* ioctl */
(void *)nullop, /* stop */
(void *)nullop, /* reset */
(void *)NULL, /* tty */
(void *)nullop, /* select */
(void *)nullop, /* mmap */
NULL /* strategy */
};
#endif
int ipl_major = 0;
MOD_DEV(IPL_VERSION, LM_DT_CHAR, -1, &ipldevsw);
extern int vd_unuseddev();
extern struct cdevsw cdevsw[];
extern int nchrdev;
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 == lkmenodev ||
cdevsw[i].d_open == iplopen)
break;
if (i == nchrdev)
return ENODEV;
ipl_major = i;
if (cdevsw[i].d_open != iplopen) {
bcopy(&cdevsw[i], &args->lkm_olddev.cdev,
sizeof(struct cdevsw));
bcopy(args->lkm_dev.cdev, &cdevsw[i],
sizeof(struct cdevsw));
}
args->lkm_offset = i; /* slot in cdevsw[] */
return ipl_load();
case LKM_E_UNLOAD :
i = args->lkm_offset;
bcopy(&args->lkm_olddev.cdev, &cdevsw[i],
sizeof(struct cdevsw));
return ipl_unload();
case LKM_E_STAT :
break;
default:
err = EIO;
break;
}
return 0;
}
static int ipl_remove()
{
struct nameidata nd;
int error;
NDINIT(&nd, DELETE, LOCKPARENT, UIO_SYSSPACE, IPL_NAME, curproc);
if ((error = namei(&nd)))
return (error);
VOP_LEASE(nd.ni_vp, curproc, curproc->p_ucred, LEASE_WRITE);
VOP_LOCK(nd.ni_vp);
VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
return VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
}
static int ipl_unload()
{
int error;
error = ipldetach();
#ifdef NETBSD_PF
pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT);
#endif
if (!error)
error = ipl_remove();
return error;
}
static int ipl_load()
{
struct nameidata nd;
struct vattr vattr;
int error, fmode = S_IFCHR|0600;
error = iplattach();
#ifdef NETBSD_PF
pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT);
#endif
if (error)
return error;
(void) ipl_remove();
error = 0;
NDINIT(&nd, CREATE, LOCKPARENT, UIO_SYSSPACE, IPL_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;
VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
return VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
}
int xxxinit(lkmtp, cmd, ver)
struct lkm_table *lkmtp;
int cmd, ver;
{
DISPATCH(lkmtp, cmd, ver, iplaction, iplaction, iplaction);
}