NetBSD-5.0.2/dist/ipf/mlfk_ipl.c
/* $NetBSD: mlfk_ipl.c,v 1.1.1.11 2008/05/20 06:44:25 darrenr Exp $ */
/*
* Copyright (C) 2000 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/conf.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/select.h>
#if __FreeBSD_version >= 500000
# include <sys/selinfo.h>
#endif
#include <net/if.h>
#include <netinet/in_systm.h>
#include <netinet/in.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_sync.h>
#if __FreeBSD_version >= 502116
static struct cdev *ipf_devs[IPL_LOGSIZE];
#else
static dev_t ipf_devs[IPL_LOGSIZE];
#endif
static int sysctl_ipf_int ( SYSCTL_HANDLER_ARGS );
static int ipf_modload(void);
static int ipf_modunload(void);
SYSCTL_DECL(_net_inet);
#define SYSCTL_IPF(parent, nbr, name, access, ptr, val, descr) \
SYSCTL_OID(parent, nbr, name, CTLTYPE_INT|access, \
ptr, val, sysctl_ipf_int, "I", descr);
#define CTLFLAG_OFF 0x00800000 /* IPFilter must be disabled */
#define CTLFLAG_RWO (CTLFLAG_RW|CTLFLAG_OFF)
SYSCTL_NODE(_net_inet, OID_AUTO, ipf, CTLFLAG_RW, 0, "IPF");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_flags, CTLFLAG_RW, &fr_flags, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_pass, CTLFLAG_RW, &fr_pass, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_active, CTLFLAG_RD, &fr_active, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_tcpidletimeout, CTLFLAG_RWO,
&fr_tcpidletimeout, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_tcphalfclosed, CTLFLAG_RWO,
&fr_tcphalfclosed, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_tcpclosewait, CTLFLAG_RWO,
&fr_tcpclosewait, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_tcplastack, CTLFLAG_RWO,
&fr_tcplastack, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_tcptimeout, CTLFLAG_RWO,
&fr_tcptimeout, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_tcpclosed, CTLFLAG_RWO,
&fr_tcpclosed, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_udptimeout, CTLFLAG_RWO,
&fr_udptimeout, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_udpacktimeout, CTLFLAG_RWO,
&fr_udpacktimeout, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_icmptimeout, CTLFLAG_RWO,
&fr_icmptimeout, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_defnatage, CTLFLAG_RWO,
&fr_defnatage, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_ipfrttl, CTLFLAG_RW,
&fr_ipfrttl, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_running, CTLFLAG_RD,
&fr_running, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_statesize, CTLFLAG_RWO,
&fr_statesize, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_statemax, CTLFLAG_RWO,
&fr_statemax, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, ipf_nattable_sz, CTLFLAG_RWO,
&ipf_nattable_sz, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, ipf_natrules_sz, CTLFLAG_RWO,
&ipf_natrules_sz, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, ipf_rdrrules_sz, CTLFLAG_RWO,
&ipf_rdrrules_sz, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, ipf_hostmap_sz, CTLFLAG_RWO,
&ipf_hostmap_sz, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_authsize, CTLFLAG_RWO,
&fr_authsize, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_authused, CTLFLAG_RD,
&fr_authused, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_defaultauthage, CTLFLAG_RW,
&fr_defaultauthage, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_chksrc, CTLFLAG_RW, &fr_chksrc, 0, "");
SYSCTL_IPF(_net_inet_ipf, OID_AUTO, fr_minttl, CTLFLAG_RW, &fr_minttl, 0, "");
#define CDEV_MAJOR 79
#include <sys/poll.h>
#if __FreeBSD_version >= 500043
# include <sys/select.h>
static int iplpoll(struct cdev *dev, int events, struct thread *td);
static struct cdevsw ipl_cdevsw = {
# if __FreeBSD_version >= 502103
.d_version = D_VERSION,
.d_flags = 0, /* D_NEEDGIANT - Should be SMP safe */
# endif
.d_open = iplopen,
.d_close = iplclose,
.d_read = iplread,
.d_write = iplwrite,
.d_ioctl = iplioctl,
.d_name = "ipl",
# if __FreeBSD_version >= 500043
.d_poll = iplpoll,
# endif
# if __FreeBSD_version < 600000
.d_maj = CDEV_MAJOR,
# endif
};
#else
static int iplpoll(dev_t dev, int events, struct proc *p);
static struct cdevsw ipl_cdevsw = {
/* open */ iplopen,
/* close */ iplclose,
/* read */ iplread,
/* write */ iplwrite,
/* ioctl */ iplioctl,
/* poll */ iplpoll,
/* mmap */ nommap,
/* strategy */ nostrategy,
/* name */ "ipl",
/* maj */ CDEV_MAJOR,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ 0,
# if (__FreeBSD_version < 500043)
/* bmaj */ -1,
# endif
# if (__FreeBSD_version > 430000)
/* kqfilter */ NULL
# endif
};
#endif
static char *ipf_devfiles[] = { IPL_NAME, IPNAT_NAME, IPSTATE_NAME, IPAUTH_NAME,
IPSYNC_NAME, IPSCAN_NAME, IPLOOKUP_NAME, NULL };
static int
ipfilter_modevent(module_t mod, int type, void *unused)
{
int error = 0;
switch (type)
{
case MOD_LOAD :
error = ipf_modload();
break;
case MOD_UNLOAD :
error = ipf_modunload();
break;
default:
error = EINVAL;
break;
}
return error;
}
static int
ipf_modload()
{
char *defpass, *c, *str;
int i, j, error;
RWLOCK_INIT(&ipf_global, "ipf filter load/unload mutex");
RWLOCK_INIT(&ipf_mutex, "ipf filter rwlock");
RWLOCK_INIT(&ipf_frcache, "ipf cache rwlock");
error = ipfattach();
if (error) {
RW_DESTROY(&ipf_global);
RW_DESTROY(&ipf_mutex);
RW_DESTROY(&ipf_frcache);
return error;
}
for (i = 0; i < IPL_LOGSIZE; i++)
ipf_devs[i] = NULL;
for (i = 0; (str = ipf_devfiles[i]); i++) {
c = NULL;
for(j = strlen(str); j > 0; j--)
if (str[j] == '/') {
c = str + j + 1;
break;
}
if (!c)
c = str;
ipf_devs[i] = make_dev(&ipl_cdevsw, i, 0, 0, 0600, c);
}
error = ipf_pfil_hook();
if (error != 0)
return error;
ipf_event_reg();
if (FR_ISPASS(fr_pass))
defpass = "pass";
else if (FR_ISBLOCK(fr_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
);
return 0;
}
static int
ipf_modunload()
{
int error, i;
if (fr_refcnt)
return EBUSY;
if (fr_running >= 0) {
ipf_pfil_unhook();
ipf_event_dereg();
WRITE_ENTER(&ipf_global);
error = ipfdetach();
RWLOCK_EXIT(&ipf_global);
if (error != 0)
return error;
} else
error = 0;
RW_DESTROY(&ipf_global);
RW_DESTROY(&ipf_mutex);
RW_DESTROY(&ipf_frcache);
fr_running = -2;
for (i = 0; ipf_devfiles[i]; i++) {
if (ipf_devs[i] != NULL)
destroy_dev(ipf_devs[i]);
}
printf("%s unloaded\n", ipfilter_version);
return error;
}
static moduledata_t ipfiltermod = {
"ipfilter",
ipfilter_modevent,
0
};
DECLARE_MODULE(ipfilter, ipfiltermod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
#ifdef MODULE_VERSION
MODULE_VERSION(ipfilter, 1);
#endif
#ifdef SYSCTL_IPF
int
sysctl_ipf_int ( SYSCTL_HANDLER_ARGS )
{
int error = 0;
if (arg1)
error = SYSCTL_OUT(req, arg1, sizeof(int));
else
error = SYSCTL_OUT(req, &arg2, sizeof(int));
if (error || !req->newptr)
return (error);
if (!arg1)
error = EPERM;
else {
if ((oidp->oid_kind & CTLFLAG_OFF) && (fr_running > 0))
error = EBUSY;
else
error = SYSCTL_IN(req, arg1, sizeof(int));
}
return (error);
}
#endif
static int
#if __FreeBSD_version >= 500043
iplpoll(struct cdev *dev, int events, struct thread *td)
#else
iplpoll(dev_t dev, int events, struct proc *td)
#endif
{
u_int xmin = GET_MINOR(dev);
int revents;
if (xmin < 0 || xmin > IPL_LOGMAX)
return 0;
revents = 0;
switch (xmin)
{
case IPL_LOGIPF :
case IPL_LOGNAT :
case IPL_LOGSTATE :
#ifdef IPFILTER_LOG
if ((events & (POLLIN | POLLRDNORM)) && ipflog_canread(xmin))
revents |= events & (POLLIN | POLLRDNORM);
#endif
break;
case IPL_LOGAUTH :
if ((events & (POLLIN | POLLRDNORM)) && fr_auth_waiting())
revents |= events & (POLLIN | POLLRDNORM);
break;
case IPL_LOGSYNC :
#ifdef IPFILTER_SYNC
if ((events & (POLLIN | POLLRDNORM)) && ipfsync_canread())
revents |= events & (POLLIN | POLLRDNORM);
if ((events & (POLLOUT | POLLWRNORM)) && ipfsync_canwrite())
revents |= events & (POLLOUT | POLLWRNORM);
#endif
break;
case IPL_LOGSCAN :
case IPL_LOGLOOKUP :
default :
break;
}
if ((revents == 0) && ((events & (POLLIN|POLLRDNORM)) != 0))
selrecord(td, &ipfselwait[xmin]);
return revents;
}