412 lines
9.6 KiB
C
412 lines
9.6 KiB
C
/*
|
|
* Copyright (C) 1993-1997 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.
|
|
*
|
|
* $Id$
|
|
*/
|
|
/*
|
|
* 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>
|
|
|
|
#if defined(__FreeBSD__) && (__FreeBSD__ > 1)
|
|
# ifdef IPFILTER_LKM
|
|
# include <osreldate.h>
|
|
# define ACTUALLY_LKM_NOT_KERNEL
|
|
# else
|
|
# ifndef __FreeBSD_version
|
|
# define __FreeBSD_version 300000 /* this will do as a hack */
|
|
# endif
|
|
# endif
|
|
#endif
|
|
#include <sys/systm.h>
|
|
#if defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)
|
|
# include "opt_devfs.h"
|
|
# include <sys/conf.h>
|
|
# include <sys/kernel.h>
|
|
# ifdef DEVFS
|
|
# include <sys/devfsext.h>
|
|
# endif /*DEVFS*/
|
|
#endif
|
|
#include <sys/conf.h>
|
|
#include <sys/file.h>
|
|
#include <sys/lock.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/socket.h>
|
|
#include <sys/exec.h>
|
|
#include <sys/mbuf.h>
|
|
#if BSD >= 199506
|
|
# include <sys/sysctl.h>
|
|
#endif
|
|
#if (__FreeBSD_version >= 199511)
|
|
#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>
|
|
#endif
|
|
#if (__FreeBSD__ > 1)
|
|
# include <sys/sysent.h>
|
|
#endif
|
|
#ifdef IPFILTER_LKM
|
|
#include <sys/lkm.h>
|
|
#endif
|
|
#include "netinet/ipl.h"
|
|
#include "netinet/ip_compat.h"
|
|
#include "netinet/ip_fil.h"
|
|
#include "netinet/ip_state.h"
|
|
#include "netinet/ip_nat.h"
|
|
#include "netinet/ip_auth.h"
|
|
#include "netinet/ip_frag.h"
|
|
|
|
|
|
#if !defined(VOP_LEASE) && defined(LEASE_CHECK)
|
|
#define VOP_LEASE LEASE_CHECK
|
|
#endif
|
|
|
|
#ifndef MIN
|
|
#define MIN(a,b) (((a)<(b))?(a):(b))
|
|
#endif
|
|
|
|
#if !defined(__FreeBSD_version) || (__FreeBSD_version < 220000)
|
|
extern int lkmenodev __P((void));
|
|
#endif
|
|
#if defined(__FreeBSD_version) && (__FreeBSD_version < 220000)
|
|
int xxxinit __P((struct lkm_table *, int, int));
|
|
#endif
|
|
|
|
#ifdef SYSCTL_INT
|
|
SYSCTL_DECL(_net_inet);
|
|
SYSCTL_NODE(_net_inet, OID_AUTO, ipf, CTLFLAG_RW, 0, "IPF");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_flags, CTLFLAG_RW, &fr_flags, 0, "");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_pass, CTLFLAG_RW, &fr_pass, 0, "");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_active, CTLFLAG_RD, &fr_active, 0, "");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_tcpidletimeout, CTLFLAG_RW,
|
|
&fr_tcpidletimeout, 0, "");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_tcpclosewait, CTLFLAG_RW,
|
|
&fr_tcpclosewait, 0, "");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_tcplastack, CTLFLAG_RW,
|
|
&fr_tcplastack, 0, "");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_tcptimeout, CTLFLAG_RW,
|
|
&fr_tcptimeout, 0, "");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_tcpclosed, CTLFLAG_RW,
|
|
&fr_tcpclosed, 0, "");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_udptimeout, CTLFLAG_RW,
|
|
&fr_udptimeout, 0, "");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_icmptimeout, CTLFLAG_RW,
|
|
&fr_icmptimeout, 0, "");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_defnatage, CTLFLAG_RW,
|
|
&fr_defnatage, 0, "");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_ipfrttl, CTLFLAG_RW,
|
|
&fr_ipfrttl, 0, "");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, ipl_unreach, CTLFLAG_RW,
|
|
&ipl_unreach, 0, "");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, ipl_inited, CTLFLAG_RD,
|
|
&ipl_inited, 0, "");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_authsize, CTLFLAG_RD,
|
|
&fr_authsize, 0, "");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_authused, CTLFLAG_RD,
|
|
&fr_authused, 0, "");
|
|
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_defaultauthage, CTLFLAG_RW,
|
|
&fr_defaultauthage, 0, "");
|
|
#endif
|
|
|
|
#ifdef DEVFS
|
|
static void *ipf_devfs[IPL_LOGMAX + 1];
|
|
#endif
|
|
|
|
#if !defined(__FreeBSD_version) || (__FreeBSD_version < 220000)
|
|
int ipl_major = 0;
|
|
|
|
static 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 */
|
|
};
|
|
|
|
MOD_DEV(IPL_VERSION, LM_DT_CHAR, -1, &ipldevsw);
|
|
|
|
extern struct cdevsw cdevsw[];
|
|
extern int vd_unuseddev __P((void));
|
|
extern int nchrdev;
|
|
#else
|
|
|
|
static struct cdevsw ipl_cdevsw = {
|
|
/* open */ iplopen,
|
|
/* close */ iplclose,
|
|
/* read */ iplread,
|
|
/* write */ nowrite,
|
|
/* ioctl */ iplioctl,
|
|
/* stop */ nostop,
|
|
/* reset */ noreset,
|
|
/* devtotty */ nodevtotty,
|
|
/* poll */ nopoll,
|
|
/* mmap */ nommap,
|
|
/* strategy */ nostrategy,
|
|
/* name */ "ipl",
|
|
/* parms */ noparms,
|
|
/* maj */ CDEV_MAJOR,
|
|
/* dump */ nodump,
|
|
/* psize */ nopsize,
|
|
/* flags */ 0,
|
|
/* maxio */ 0,
|
|
/* bmaj */ -1
|
|
};
|
|
#endif
|
|
|
|
|
|
static void ipl_drvinit __P((void *));
|
|
|
|
#ifdef ACTUALLY_LKM_NOT_KERNEL
|
|
static int if_ipl_unload __P((struct lkm_table *, int));
|
|
static int if_ipl_load __P((struct lkm_table *, int));
|
|
static int if_ipl_remove __P((void));
|
|
static int ipl_major = CDEV_MAJOR;
|
|
|
|
static int iplaction __P((struct lkm_table *, int));
|
|
static char *ipf_devfiles[] = { IPL_NAME, IPL_NAT, IPL_STATE, IPL_AUTH, NULL };
|
|
static int iplaction(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
#if !defined(__FreeBSD_version) || (__FreeBSD_version < 220000)
|
|
int i = ipl_major;
|
|
struct lkm_dev *args = lkmtp->private.lkm_dev;
|
|
#endif
|
|
int err = 0;
|
|
|
|
switch (cmd)
|
|
{
|
|
case LKM_E_LOAD :
|
|
if (lkmexists(lkmtp))
|
|
return EEXIST;
|
|
|
|
#if !defined(__FreeBSD_version) || (__FreeBSD_version < 220000)
|
|
for (i = 0; i < nchrdev; i++)
|
|
if (cdevsw[i].d_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[] */
|
|
#endif
|
|
printf("IP Filter: loaded into slot %d\n", ipl_major);
|
|
err = if_ipl_load(lkmtp, cmd);
|
|
if (!err)
|
|
ipl_drvinit((void *)NULL);
|
|
return err;
|
|
break;
|
|
case LKM_E_UNLOAD :
|
|
err = if_ipl_unload(lkmtp, cmd);
|
|
if (!err) {
|
|
printf("IP Filter: unloaded from slot %d\n",
|
|
ipl_major);
|
|
# ifdef DEVFS
|
|
if (ipf_devfs[IPL_LOGIPF])
|
|
devfs_remove_dev(ipf_devfs[IPL_LOGIPF]);
|
|
if (ipf_devfs[IPL_LOGNAT])
|
|
devfs_remove_dev(ipf_devfs[IPL_LOGNAT]);
|
|
if (ipf_devfs[IPL_LOGSTATE])
|
|
devfs_remove_dev(ipf_devfs[IPL_LOGSTATE]);
|
|
if (ipf_devfs[IPL_LOGAUTH])
|
|
devfs_remove_dev(ipf_devfs[IPL_LOGAUTH]);
|
|
# endif
|
|
}
|
|
return err;
|
|
case LKM_E_STAT :
|
|
break;
|
|
default:
|
|
err = EIO;
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int if_ipl_remove __P((void))
|
|
{
|
|
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);
|
|
vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY, curproc);
|
|
VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
|
|
(void) VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
|
|
if (nd.ni_dvp == nd.ni_vp)
|
|
vrele(nd.ni_dvp);
|
|
else
|
|
vput(nd.ni_dvp);
|
|
if (nd.ni_vp != NULLVP)
|
|
vput(nd.ni_vp);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int if_ipl_unload(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
int error = 0;
|
|
|
|
error = ipldetach();
|
|
if (!error)
|
|
error = if_ipl_remove();
|
|
return error;
|
|
}
|
|
|
|
|
|
static int if_ipl_load(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct nameidata nd;
|
|
struct vattr vattr;
|
|
int error = 0, fmode = S_IFCHR|0600, i;
|
|
char *name;
|
|
|
|
error = iplattach();
|
|
if (error)
|
|
return error;
|
|
(void) if_ipl_remove();
|
|
|
|
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);
|
|
vput(nd.ni_dvp);
|
|
if (error)
|
|
return error;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#endif /* actually LKM */
|
|
|
|
#if defined(__FreeBSD_version) && (__FreeBSD_version < 220000)
|
|
/*
|
|
* strlen isn't present in 2.1.* kernels.
|
|
*/
|
|
size_t strlen(string)
|
|
char *string;
|
|
{
|
|
register char *s;
|
|
|
|
for (s = string; *s; s++)
|
|
;
|
|
return (size_t)(s - string);
|
|
}
|
|
|
|
|
|
int xxxinit(lkmtp, cmd, ver)
|
|
struct lkm_table *lkmtp;
|
|
int cmd, ver;
|
|
{
|
|
DISPATCH(lkmtp, cmd, ver, iplaction, iplaction, iplaction);
|
|
}
|
|
#else
|
|
# ifdef IPFILTER_LKM
|
|
# include <sys/exec.h>
|
|
|
|
MOD_DECL(if_ipl);
|
|
|
|
|
|
static struct lkm_dev _module = {
|
|
LM_DEV,
|
|
LKM_VERSION,
|
|
IPL_VERSION,
|
|
CDEV_MAJOR,
|
|
LM_DT_CHAR,
|
|
{ (void *)&ipl_cdevsw }
|
|
};
|
|
|
|
|
|
int if_ipl __P((struct lkm_table *, int, int));
|
|
|
|
|
|
int if_ipl(lkmtp, cmd, ver)
|
|
struct lkm_table *lkmtp;
|
|
int cmd, ver;
|
|
{
|
|
DISPATCH(lkmtp, cmd, ver, iplaction, iplaction, iplaction);
|
|
}
|
|
# endif
|
|
static int ipl_devsw_installed;
|
|
|
|
static void ipl_drvinit __P((void *unused))
|
|
{
|
|
# ifdef DEVFS
|
|
void **tp = ipf_devfs;
|
|
# endif
|
|
|
|
if (!ipl_devsw_installed ) {
|
|
cdevsw_add(&ipl_cdevsw);
|
|
ipl_devsw_installed = 1;
|
|
|
|
# ifdef DEVFS
|
|
tp[IPL_LOGIPF] = devfs_add_devswf(&ipl_cdevsw, IPL_LOGIPF,
|
|
DV_CHR, 0, 0, 0600, "ipf");
|
|
tp[IPL_LOGNAT] = devfs_add_devswf(&ipl_cdevsw, IPL_LOGNAT,
|
|
DV_CHR, 0, 0, 0600, "ipnat");
|
|
tp[IPL_LOGSTATE] = devfs_add_devswf(&ipl_cdevsw, IPL_LOGSTATE,
|
|
DV_CHR, 0, 0, 0600,
|
|
"ipstate");
|
|
tp[IPL_LOGAUTH] = devfs_add_devswf(&ipl_cdevsw, IPL_LOGAUTH,
|
|
DV_CHR, 0, 0, 0600,
|
|
"ipauth");
|
|
# endif
|
|
}
|
|
}
|
|
|
|
SYSINIT(ipldev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ipl_drvinit,NULL);
|
|
#endif /* _FreeBSD_version */
|