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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>
#if defined(__FreeBSD__)
# ifdef IPFILTER_LKM
# ifndef __FreeBSD_cc_version
# include <osreldate.h>
# else
# if __FreeBSD_cc_version < 430000
# include <osreldate.h>
# endif
# endif
# define ACTUALLY_LKM_NOT_KERNEL
# else
# ifndef __FreeBSD_cc_version
# include <sys/osreldate.h>
# else
# if __FreeBSD_cc_version < 430000
# include <sys/osreldate.h>
# endif
# endif
# endif
#endif
#include <sys/systm.h>
#if defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)
# ifndef ACTUALLY_LKM_NOT_KERNEL
# include "opt_devfs.h"
# endif
# 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>
#if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
# include <sys/lock.h>
#endif
#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 BSD >= 199506
# include <sys/sysctl.h>
#endif
#if (__FreeBSD_version >= 300000)
# include <sys/socket.h>
#endif
#include <net/if.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <net/route.h>
#include <net/if.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcpip.h>
#include <sys/sysent.h>
#include <sys/lkm.h>
#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"
#include "netinet/ip_proxy.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
int xxxinit __P((struct lkm_table *, int, int));
#ifdef SYSCTL_INT
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_chksrc, CTLFLAG_RW, &fr_chksrc, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_minttl, CTLFLAG_RW, &fr_minttl, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_minttllog, CTLFLAG_RW,
&fr_minttllog, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_tcpidletimeout, CTLFLAG_RW,
&fr_tcpidletimeout, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_tcphalfclosed, CTLFLAG_RW,
&fr_tcphalfclosed, 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_udpacktimeout, CTLFLAG_RW,
&fr_udpacktimeout, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_icmptimeout, CTLFLAG_RW,
&fr_icmptimeout, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_icmpacktimeout, CTLFLAG_RW,
&fr_icmpacktimeout, 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, fr_running, CTLFLAG_RD,
&fr_running, 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, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, ippr_ftp_pasvonly, CTLFLAG_RW,
&ippr_ftp_pasvonly, 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 = {
iplopen, iplclose, iplread, nowrite, /* 79 */
iplioctl, nostop, noreset, nodevtotty,
#if (__FreeBSD_version >= 300000)
seltrue, nommap, nostrategy, "ipl",
#else
noselect, nommap, nostrategy, "ipl",
#endif
NULL, -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 };
extern int lkmenodev __P((void));
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);
#if (__FreeBSD_version >= 300000)
VOP_LOCK(nd.ni_vp, LK_RETRY | LK_EXCLUSIVE, 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);
#else
VOP_LOCK(nd.ni_vp);
VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
(void) VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
#endif
}
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);
#if (__FreeBSD_version >= 300000)
vput(nd.ni_dvp);
#endif
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 /* __FREEBSD_version >= 220000 */
# ifdef IPFILTER_LKM
# include <sys/exec.h>
# if (__FreeBSD_version >= 300000)
MOD_DEV(if_ipl, LM_DT_CHAR, CDEV_MAJOR, &ipl_cdevsw);
# else
MOD_DECL(if_ipl);
static struct lkm_dev _module = {
LM_DEV,
LKM_VERSION,
IPL_VERSION,
CDEV_MAJOR,
LM_DT_CHAR,
{ (void *)&ipl_cdevsw }
};
# endif
int if_ipl __P((struct lkm_table *, int, int));
int if_ipl(lkmtp, cmd, ver)
struct lkm_table *lkmtp;
int cmd, ver;
{
# if (__FreeBSD_version >= 300000)
MOD_DISPATCH(if_ipl, lkmtp, cmd, ver, iplaction, iplaction, iplaction);
# else
DISPATCH(lkmtp, cmd, ver, iplaction, iplaction, iplaction);
# endif
}
# endif /* IPFILTER_LKM */
static int ipl_devsw_installed = 0;
static void ipl_drvinit __P((void *unused))
{
dev_t dev;
# ifdef DEVFS
void **tp = ipf_devfs;
# endif
if (!ipl_devsw_installed ) {
dev = makedev(CDEV_MAJOR, 0);
cdevsw_add(&dev, &ipl_cdevsw, NULL);
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
}
}
# if defined(IPFILTER_LKM) || \
defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)
SYSINIT(ipldev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ipl_drvinit,NULL)
# endif /* IPFILTER_LKM */
#endif /* _FreeBSD_version */
|
