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|
/* $FreeBSD$ */
/*
* Copyright (C) 2012 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 <sys/poll.h>
#include <sys/select.h>
#include "ipl.h"
#include "ip_compat.h"
#include "ip_fil.h"
#include "ip_auth.h"
#include "ip_state.h"
#include "ip_nat.h"
#include "ip_sync.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
extern int lkmenodev __P((void));
#if NetBSD >= 199706
int ipflkm_lkmentry __P((struct lkm_table *, int, int));
#else
int xxxinit __P((struct lkm_table *, int, int));
#endif
static int ipf_unload __P((void));
static int ipf_load __P((void));
static int ipf_remove __P((void));
static int ipfaction __P((struct lkm_table *, int));
static char *ipf_devfiles[] = { IPL_NAME, IPNAT_NAME, IPSTATE_NAME,
IPAUTH_NAME, IPSYNC_NAME, IPSCAN_NAME,
IPLOOKUP_NAME, NULL };
int ipf_major = 0;
extern ipf_main_softc_t ipfmain;
extern const struct cdevsw ipl_cdevsw;
#if defined(__NetBSD__) && (__NetBSD_Version__ >= 106080000)
MOD_DEV(IPL_VERSION, "ipf", 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;
int
#if NetBSD >= 199706
ipflkm_lkmentry(lkmtp, cmd, ver)
#else
xxxinit(lkmtp, cmd, ver)
#endif
struct lkm_table *lkmtp;
int cmd, ver;
{
DISPATCH(lkmtp, cmd, ver, ipfaction, ipfaction, ipfaction);
}
static int
ipfaction(lkmtp, cmd)
struct lkm_table *lkmtp;
int cmd;
{
#if !defined(__NetBSD__) || (__NetBSD_Version__ < 106080000)
int i;
#endif
struct lkm_dev *args = lkmtp->private.lkm_dev;
int err = 0;
switch (cmd)
{
case LKM_E_LOAD :
if (lkmexists(lkmtp))
return EEXIST;
#if defined(__NetBSD__) && (__NetBSD_Version__ >= 106080000)
# if (__NetBSD_Version__ < 200000000)
err = devsw_attach(args->lkm_devname,
args->lkm_bdev, &args->lkm_bdevmaj,
args->lkm_cdev, &args->lkm_cdevmaj);
if (err != 0)
return (err);
# endif
ipf_major = args->lkm_cdevmaj;
#else
for (i = 0; i < nchrdev; i++)
if (cdevsw[i].d_open == (dev_type_open((*)))lkmenodev ||
cdevsw[i].d_open == ipfopen)
break;
if (i == nchrdev) {
printf("IP Filter: No free cdevsw slots\n");
return ENODEV;
}
ipf_major = i;
args->lkm_offset = i; /* slot in cdevsw[] */
#endif
printf("IP Filter: loaded into slot %d\n", ipf_major);
return ipf_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 = ipf_unload();
if (!err)
printf("IP Filter: unloaded from slot %d\n",
ipf_major);
break;
case LKM_E_STAT :
break;
default:
err = EIO;
break;
}
return err;
}
static int
ipf_remove()
{
char *name;
struct nameidata nd;
int error, i;
for (i = 0; (name = ipf_devfiles[i]); i++) {
#if (__NetBSD_Version__ > 106009999)
# if (__NetBSD_Version__ > 399001400)
# if (__NetBSD_Version__ > 499001400)
NDINIT(&nd, DELETE, LOCKPARENT|LOCKLEAF, UIO_SYSSPACE,
name);
# else
NDINIT(&nd, DELETE, LOCKPARENT|LOCKLEAF, UIO_SYSSPACE,
name, curlwp);
# endif
# else
NDINIT(&nd, DELETE, LOCKPARENT|LOCKLEAF, UIO_SYSSPACE,
name, curproc);
# endif
#else
NDINIT(&nd, DELETE, LOCKPARENT, UIO_SYSSPACE, name, curproc);
#endif
if ((error = namei(&nd)))
return (error);
#if (__NetBSD_Version__ > 399001400)
# if (__NetBSD_Version__ > 399002000)
# if (__NetBSD_Version__ < 499001400)
VOP_LEASE(nd.ni_dvp, curlwp, curlwp->l_cred, LEASE_WRITE);
# endif
# else
VOP_LEASE(nd.ni_dvp, curlwp, curlwp->l_proc->p_ucred, LEASE_WRITE);
# endif
#else
VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
#endif
#if !defined(__NetBSD_Version__) || (__NetBSD_Version__ < 106000000)
vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
#endif
#if (__NetBSD_Version__ >= 399002000)
# if (__NetBSD_Version__ < 499001400)
VOP_LEASE(nd.ni_vp, curlwp, curlwp->l_cred, LEASE_WRITE);
# endif
#else
# if (__NetBSD_Version__ > 399001400)
VOP_LEASE(nd.ni_vp, curlwp, curlwp->l_proc->p_ucred, LEASE_WRITE);
# else
VOP_LEASE(nd.ni_vp, curproc, curproc->p_ucred, LEASE_WRITE);
# endif
#endif
(void) VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
}
return 0;
}
static int
ipf_unload()
{
int error = 0;
/*
* Unloading - remove the filter rule check from the IP
* input/output stream.
*/
if (ipfmain.ipf_refcnt)
error = EBUSY;
else if (ipfmain.ipf_running >= 0) {
error = ipfdetach(&ipfmain);
if (error == 0) {
ipf_destroy_all(&ipfmain);
ipf_unload_all();
}
}
if (error == 0) {
ipfmain.ipf_running = -2;
error = ipf_remove();
printf("%s unloaded\n", ipfilter_version);
}
return error;
}
static int
ipf_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)ipf_remove();
bzero((char *)&ipfmain, sizeof(ipfmain));
error = ipf_load_all();
if (error != 0)
return error;
if (ipf_create_all(&ipfmain) == NULL) {
ipf_unload_all();
return EIO;
}
error = ipfattach(&ipfmain);
if (error != 0) {
(void) ipf_unload();
return error;
}
for (i = 0; (error == 0) && (name = ipf_devfiles[i]); i++) {
#if (__NetBSD_Version__ > 399001400)
# if (__NetBSD_Version__ > 499001400)
NDINIT(&nd, CREATE, LOCKPARENT, UIO_SYSSPACE, name);
# else
NDINIT(&nd, CREATE, LOCKPARENT, UIO_SYSSPACE, name, curlwp);
# endif
#else
NDINIT(&nd, CREATE, LOCKPARENT, UIO_SYSSPACE, name, curproc);
#endif
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 = (ipf_major << 8) | i;
#if (__NetBSD_Version__ > 399001400)
# if (__NetBSD_Version__ >= 399002000)
# if (__NetBSD_Version__ < 499001400)
VOP_LEASE(nd.ni_dvp, curlwp, curlwp->l_cred, LEASE_WRITE);
# endif
# else
VOP_LEASE(nd.ni_dvp, curlwp, curlwp->l_proc->p_ucred, LEASE_WRITE);
# endif
#else
VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
#endif
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
if (error == 0)
vput(nd.ni_vp);
}
if (error == 0) {
char *defpass;
if (FR_ISPASS(ipfmain.ipf_pass))
defpass = "pass";
else if (FR_ISBLOCK(ipfmain.ipf_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
);
ipfmain.ipf_running = 1;
}
return error;
}
|
