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NetBSD/sys/netinet/ip_fil.c
itojun d1fcb86326 tabify
2003-06-26 00:43:31 +00:00

2230 lines
48 KiB
C
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/* $NetBSD: ip_fil.c,v 1.90 2003/06/26 00:43:32 itojun Exp $ */
/*
* Copyright (C) 1993-2001 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*/
#ifndef SOLARIS
#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
#endif
#if defined(KERNEL) && !defined(_KERNEL)
# define _KERNEL
#endif
#if defined(_KERNEL) && defined(__FreeBSD_version) && \
(__FreeBSD_version >= 400000) && !defined(KLD_MODULE)
#include "opt_inet6.h"
#endif
#include <sys/param.h>
#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
defined(_KERNEL) && !defined(_LKM)
# include "opt_ipfilter_log.h"
# include "opt_pfil_hooks.h"
#endif
#if defined(__FreeBSD__) && !defined(__FreeBSD_version)
# if !defined(_KERNEL) || defined(IPFILTER_LKM)
# include <osreldate.h>
# endif
#endif
#ifdef __sgi
# define _KMEMUSER
# include <sys/ptimers.h>
#endif
#ifndef _KERNEL
# include <stdio.h>
# include <string.h>
# include <stdlib.h>
# include <ctype.h>
# include <fcntl.h>
#endif
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/file.h>
#if __FreeBSD_version >= 220000 && defined(_KERNEL)
# include <sys/fcntl.h>
# include <sys/filio.h>
#else
# include <sys/ioctl.h>
#endif
#include <sys/time.h>
#ifdef _KERNEL
# include <sys/systm.h>
#endif
#if !SOLARIS
# if (NetBSD > 199609) || (OpenBSD > 199603) || (__FreeBSD_version >= 300000)
# include <sys/dirent.h>
# else
# include <sys/dir.h>
# endif
# include <sys/mbuf.h>
#else
# include <sys/filio.h>
#endif
#include <sys/protosw.h>
#include <sys/socket.h>
#include <net/if.h>
#ifdef sun
# include <net/af.h>
#endif
#if __FreeBSD_version >= 300000
# include <net/if_var.h>
# if defined(_KERNEL) && !defined(IPFILTER_LKM)
# include "opt_ipfilter.h"
# endif
#endif
#ifdef __sgi
#include <sys/debug.h>
# ifdef IFF_DRVRLOCK /* IRIX6 */
#include <sys/hashing.h>
# endif
#endif
#include <net/route.h>
#include <netinet/in.h>
#if !(defined(__sgi) && !defined(IFF_DRVRLOCK)) /* IRIX < 6 */
# include <netinet/in_var.h>
#endif
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/tcpip.h>
#include <netinet/ip_icmp.h>
#ifndef _KERNEL
# include <unistd.h>
# include <syslog.h>
#endif
#include "netinet/ip_compat.h"
#ifdef USE_INET6
# include <netinet/icmp6.h>
# if !SOLARIS
# include <netinet6/ip6protosw.h>
# include <netinet6/nd6.h>
# endif
#endif
#include "netinet/ip_fil.h"
#include "netinet/ip_nat.h"
#include "netinet/ip_frag.h"
#include "netinet/ip_state.h"
#include "netinet/ip_proxy.h"
#include "netinet/ip_auth.h"
#if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
# include <sys/malloc.h>
#endif
#ifndef MIN
# define MIN(a,b) (((a)<(b))?(a):(b))
#endif
#if !SOLARIS && defined(_KERNEL) && !defined(__sgi)
# include <sys/kernel.h>
extern int ip_optcopy __P((struct ip *, struct ip *));
#endif
#if !defined(lint)
#if defined(__NetBSD__)
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ip_fil.c,v 1.90 2003/06/26 00:43:32 itojun Exp $");
#else
static const char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-2000 Darren Reed";
static const char rcsid[] = "@(#)Id: ip_fil.c,v 2.42.2.60 2002/08/28 12:40:39 darrenr Exp";
#endif
#endif
extern struct protosw inetsw[];
#ifndef _KERNEL
# include "ipt.h"
static struct ifnet **ifneta = NULL;
static int nifs = 0;
#else
# if (BSD < 199306) || defined(__sgi)
extern int tcp_ttl;
# endif
#endif
#ifdef ICMP_UNREACH_FILTER_PROHIB
int ipl_unreach = ICMP_UNREACH_FILTER_PROHIB;
#else
int ipl_unreach = ICMP_UNREACH_FILTER;
#endif
u_long ipl_frouteok[2] = {0, 0};
static int frzerostats __P((caddr_t));
#if defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003)
static int frrequest __P((int, u_long, caddr_t, int));
#else
static int frrequest __P((int, int, caddr_t, int));
#endif
#ifdef _KERNEL
static int (*fr_savep) __P((ip_t *, int, void *, int, struct mbuf **));
static int send_ip __P((ip_t *, fr_info_t *, struct mbuf **));
# ifdef USE_INET6
static int ipfr_fastroute6 __P((struct mbuf *, struct mbuf **,
fr_info_t *, frdest_t *));
# endif
# ifdef __sgi
extern int tcp_mtudisc;
extern kmutex_t ipf_rw;
extern KRWLOCK_T ipf_mutex;
# endif
#else
void init_ifp __P((void));
# if defined(__sgi) && (IRIX < 605)
static int no_output __P((struct ifnet *, struct mbuf *,
struct sockaddr *));
static int write_output __P((struct ifnet *, struct mbuf *,
struct sockaddr *));
# else
static int no_output __P((struct ifnet *, struct mbuf *,
struct sockaddr *, struct rtentry *));
static int write_output __P((struct ifnet *, struct mbuf *,
struct sockaddr *, struct rtentry *));
# endif
#endif
int fr_running = 0;
#if (__FreeBSD_version >= 300000) && defined(_KERNEL)
struct callout_handle ipfr_slowtimer_ch;
#endif
#if defined(__NetBSD__) && (__NetBSD_Version__ >= 104230000)
# include <sys/callout.h>
struct callout ipfr_slowtimer_ch;
#endif
#if defined(__OpenBSD__)
# include <sys/timeout.h>
struct timeout ipfr_slowtimer_ch;
#endif
#if defined(__sgi) && defined(_KERNEL)
toid_t ipfr_slowtimer_ch;
#endif
#if defined(__NetBSD__) && (__NetBSD_Version__ >= 106080000) && \
defined(_KERNEL)
#include <sys/conf.h>
#include <sys/event.h>
const struct cdevsw ipl_cdevsw = {
iplopen, iplclose, iplread, nowrite, iplioctl,
nostop, notty, nopoll, nommap, nokqfilter,
};
#endif
#if (_BSDI_VERSION >= 199510) && defined(_KERNEL)
# include <sys/device.h>
# include <sys/conf.h>
struct cfdriver iplcd = {
NULL, "ipl", NULL, NULL, DV_DULL, 0
};
struct devsw iplsw = {
&iplcd,
iplopen, iplclose, iplread, nowrite, iplioctl, noselect, nommap,
nostrat, nodump, nopsize, 0,
nostop
};
#endif /* _BSDI_VERSION >= 199510 && _KERNEL */
#if defined(__NetBSD__) || defined(__OpenBSD__) || (_BSDI_VERSION >= 199701)
# include <sys/conf.h>
# if defined(NETBSD_PF)
# include <net/pfil.h>
/*
* We provide the fr_checkp name just to minimize changes later.
*/
int (*fr_checkp) __P((ip_t *ip, int hlen, void *ifp, int out, mb_t **mp));
# endif /* NETBSD_PF */
#endif /* __NetBSD__ */
#if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 105110000) && \
defined(_KERNEL)
# include <net/pfil.h>
static int fr_check_wrapper(void *, struct mbuf **, struct ifnet *, int );
static int fr_check_wrapper(arg, mp, ifp, dir)
void *arg;
struct mbuf **mp;
struct ifnet *ifp;
int dir;
{
struct ip *ip = mtod(*mp, struct ip *);
int rv, hlen = ip->ip_hl << 2;
#if defined(M_CSUM_TCPv4)
/*
* If the packet is out-bound, we can't delay checksums
* here. For in-bound, the checksum has already been
* validated.
*/
if (dir == PFIL_OUT) {
if ((*mp)->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) {
in_delayed_cksum(*mp);
(*mp)->m_pkthdr.csum_flags &=
~(M_CSUM_TCPv4|M_CSUM_UDPv4);
}
}
#endif /* M_CSUM_TCPv4 */
/*
* We get the packet with all fields in network byte
* order. We expect ip_len and ip_off to be in host
* order. We frob them, call the filter, then frob
* them back.
*
* Note, we don't need to update the checksum, because
* it has already been verified.
*/
NTOHS(ip->ip_len);
NTOHS(ip->ip_off);
rv = fr_check(ip, hlen, ifp, (dir == PFIL_OUT), mp);
if (rv == 0 && *mp != NULL) {
ip = mtod(*mp, struct ip *);
HTONS(ip->ip_len);
HTONS(ip->ip_off);
}
return (rv);
}
# ifdef USE_INET6
# include <netinet/ip6.h>
static int fr_check_wrapper6(void *, struct mbuf **, struct ifnet *, int );
static int fr_check_wrapper6(arg, mp, ifp, dir)
void *arg;
struct mbuf **mp;
struct ifnet *ifp;
int dir;
{
return (fr_check(mtod(*mp, struct ip *), sizeof(struct ip6_hdr),
ifp, (dir == PFIL_OUT), mp));
}
# endif
#endif /* __NetBSD_Version >= 105110000 && _KERNEL */
#ifdef _KERNEL
# if defined(IPFILTER_LKM) && !defined(__sgi)
int iplidentify(s)
char *s;
{
if (strcmp(s, "ipl") == 0)
return 1;
return 0;
}
# endif /* IPFILTER_LKM */
/*
* Try to detect the case when compiling for NetBSD with pseudo-device
*/
# if defined(__NetBSD__) && defined(PFIL_HOOKS)
void
ipfilterattach(count)
int count;
{
/*
* Do nothing here, really. The filter will be enabled
* by the SIOCFRENB ioctl.
*/
}
# endif
# if defined(__NetBSD__)
int ipl_enable()
# else
int iplattach()
# endif
{
char *defpass;
int s;
# if defined(__sgi) || (defined(NETBSD_PF) && (__NetBSD_Version__ >= 104200000))
int error = 0;
# endif
#if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 105110000)
struct pfil_head *ph_inet;
# ifdef USE_INET6
struct pfil_head *ph_inet6;
# endif
#endif
SPL_NET(s);
if (fr_running || (fr_checkp == fr_check)) {
printf("IP Filter: already initialized\n");
SPL_X(s);
return EBUSY;
}
# ifdef IPFILTER_LOG
ipflog_init();
# endif
if (nat_init() == -1) {
SPL_X(s);
return EIO;
}
if (fr_stateinit() == -1) {
SPL_X(s);
return EIO;
}
if (appr_init() == -1) {
SPL_X(s);
return EIO;
}
# ifdef NETBSD_PF
# if (__NetBSD_Version__ >= 104200000) || (__FreeBSD_version >= 500011)
# if __NetBSD_Version__ >= 105110000
ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET);
# ifdef USE_INET6
ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6);
# endif
if (ph_inet == NULL
# ifdef USE_INET6
&& ph_inet6 == NULL
# endif
)
return ENODEV;
if (ph_inet != NULL)
error = pfil_add_hook((void *)fr_check_wrapper, NULL,
PFIL_IN|PFIL_OUT, ph_inet);
else
error = 0;
# else
error = pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT,
&inetsw[ip_protox[IPPROTO_IP]].pr_pfh);
# endif
if (error) {
# ifdef USE_INET6
goto pfil_error;
# else
SPL_X(s);
appr_unload();
ip_natunload();
fr_stateunload();
return error;
# endif
}
# else
pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT);
# endif
# ifdef USE_INET6
# if __NetBSD_Version__ >= 105110000
if (ph_inet6 != NULL)
error = pfil_add_hook((void *)fr_check_wrapper6, NULL,
PFIL_IN|PFIL_OUT, ph_inet6);
else
error = 0;
if (error) {
pfil_remove_hook((void *)fr_check_wrapper6, NULL,
PFIL_IN|PFIL_OUT, ph_inet6);
# else
error = pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT,
&inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh);
if (error) {
pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT,
&inetsw[ip_protox[IPPROTO_IP]].pr_pfh);
# endif
pfil_error:
SPL_X(s);
appr_unload();
ip_natunload();
fr_stateunload();
return error;
}
# endif
# endif
# ifdef __sgi
error = ipfilter_sgi_attach();
if (error) {
SPL_X(s);
appr_unload();
ip_natunload();
fr_stateunload();
return error;
}
# endif
bzero((char *)frcache, sizeof(frcache));
fr_savep = fr_checkp;
fr_checkp = fr_check;
fr_running = 1;
SPL_X(s);
if (fr_pass & FR_PASS)
defpass = "pass";
else if (fr_pass & FR_BLOCK)
defpass = "block";
else
defpass = "no-match -> block";
printf("%s initialized. Default = %s all, Logging = %s\n",
ipfilter_version, defpass,
# ifdef IPFILTER_LOG
"enabled");
# else
"disabled");
# endif
#ifdef _KERNEL
# if defined(__NetBSD__) && (__NetBSD_Version__ >= 104230000)
callout_init(&ipfr_slowtimer_ch);
callout_reset(&ipfr_slowtimer_ch, hz / 2, ipfr_slowtimer, NULL);
# else
# if defined(__OpenBSD__)
timeout_set(&ipfr_slowtimer_ch, ipfr_slowtimer, NULL);
timeout_add(&ipfr_slowtimer_ch, hz/2);
# else
# if (__FreeBSD_version >= 300000) || defined(__sgi)
ipfr_slowtimer_ch = timeout(ipfr_slowtimer, NULL, hz/2);
# else
timeout(ipfr_slowtimer, NULL, hz/2);
# endif
# endif
# endif
#endif
return 0;
}
/*
* Disable the filter by removing the hooks from the IP input/output
* stream.
*/
# if defined(__NetBSD__)
int ipl_disable()
# else
int ipldetach()
# endif
{
int s, i;
#if defined(NETBSD_PF) && (__NetBSD_Version__ >= 104200000)
int error = 0;
# if __NetBSD_Version__ >= 105150000
struct pfil_head *ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET);
# ifdef USE_INET6
struct pfil_head *ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6);
# endif
# endif
#endif
#ifdef _KERNEL
# if defined(__NetBSD__) && (__NetBSD_Version__ >= 104230000)
callout_stop(&ipfr_slowtimer_ch);
# else
# if (__FreeBSD_version >= 300000)
untimeout(ipfr_slowtimer, NULL, ipfr_slowtimer_ch);
# else
# ifdef __sgi
untimeout(ipfr_slowtimer_ch);
# else
# if defined(__OpenBSD__)
timeout_del(&ipfr_slowtimer_ch);
# else
untimeout(ipfr_slowtimer, NULL);
# endif /* OpenBSD */
# endif /* __sgi */
# endif /* FreeBSD */
# endif /* NetBSD */
#endif
SPL_NET(s);
if (!fr_running)
{
printf("IP Filter: not initialized\n");
SPL_X(s);
return 0;
}
printf("%s unloaded\n", ipfilter_version);
fr_checkp = fr_savep;
i = frflush(IPL_LOGIPF, FR_INQUE|FR_OUTQUE|FR_INACTIVE);
i += frflush(IPL_LOGIPF, FR_INQUE|FR_OUTQUE);
fr_running = 0;
# ifdef NETBSD_PF
# if ((__NetBSD_Version__ >= 104200000) || (__FreeBSD_version >= 500011))
# if __NetBSD_Version__ >= 105110000
if (ph_inet != NULL)
error = pfil_remove_hook((void *)fr_check_wrapper, NULL,
PFIL_IN|PFIL_OUT, ph_inet);
else
error = 0;
# else
error = pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT,
&inetsw[ip_protox[IPPROTO_IP]].pr_pfh);
# endif
if (error) {
SPL_X(s);
return error;
}
# else
pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT);
# endif
# ifdef USE_INET6
# if __NetBSD_Version__ >= 105110000
if (ph_inet6 != NULL)
error = pfil_remove_hook((void *)fr_check_wrapper6, NULL,
PFIL_IN|PFIL_OUT, ph_inet6);
else
error = 0;
# else
error = pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT,
&inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh);
# endif
if (error) {
SPL_X(s);
return error;
}
# endif
# endif
# ifdef __sgi
ipfilter_sgi_detach();
# endif
appr_unload();
ipfr_unload();
ip_natunload();
fr_stateunload();
fr_authunload();
SPL_X(s);
return 0;
}
#endif /* _KERNEL */
static int frzerostats(data)
caddr_t data;
{
friostat_t fio;
int error;
fr_getstat(&fio);
error = IWCOPYPTR((caddr_t)&fio, data, sizeof(fio));
if (error)
return EFAULT;
bzero((char *)frstats, sizeof(*frstats) * 2);
return 0;
}
/*
* Filter ioctl interface.
*/
#ifdef __sgi
int IPL_EXTERN(ioctl)(dev_t dev, int cmd, caddr_t data, int mode
# ifdef _KERNEL
, cred_t *cp, int *rp
# endif
)
#else
int IPL_EXTERN(ioctl)(dev, cmd, data, mode
# if (defined(_KERNEL) && ((_BSDI_VERSION >= 199510) || (BSD >= 199506) || \
(NetBSD >= 199511) || (__FreeBSD_version >= 220000) || \
defined(__OpenBSD__)))
, p)
struct proc *p;
# else
)
# endif
dev_t dev;
# if defined(__NetBSD__) || defined(__OpenBSD__) || \
(_BSDI_VERSION >= 199701) || (__FreeBSD_version >= 300000)
u_long cmd;
# else
int cmd;
# endif
caddr_t data;
int mode;
#endif /* __sgi */
{
#if defined(_KERNEL) && !SOLARIS
int s;
#endif
int error = 0, unit = 0, tmp;
#if (BSD >= 199306) && defined(_KERNEL)
if ((securelevel >= 2) && (mode & FWRITE))
return EPERM;
#endif
#ifdef _KERNEL
unit = GET_MINOR(dev);
if ((IPL_LOGMAX < unit) || (unit < 0))
return ENXIO;
#else
unit = dev;
#endif
if (fr_running == 0 && (cmd != SIOCFRENB || unit != IPL_LOGIPF))
return ENODEV;
SPL_NET(s);
if (unit == IPL_LOGNAT) {
/*
* If we're doing a NAT operation, implicitly enable
* IP Filter if not already enabled. We do this
* because filtering and NAT are really separate
* operations, and it's not entirely obvious from
* a user's point of view that you need to enable
* the filter in order to enable NAT.
*
* Since the default rule is to pass all packets,
* this shouldn't cause any noticeable side-effects.
*/
if (fr_running == 0) {
#if defined(_KERNEL)
error = ipl_enable();
#else
error = EIO;
#endif
}
if (error == 0)
error = nat_ioctl(data, cmd, mode);
SPL_X(s);
return error;
}
if (unit == IPL_LOGSTATE) {
if (fr_running)
error = fr_state_ioctl(data, cmd, mode);
else
error = EIO;
SPL_X(s);
return error;
}
if (unit == IPL_LOGAUTH) {
if (!fr_running)
error = EIO;
else
error = fr_auth_ioctl(data, mode, cmd, NULL, NULL);
SPL_X(s);
return error;
}
switch (cmd) {
case FIONREAD :
#ifdef IPFILTER_LOG
error = IWCOPY((caddr_t)&iplused[IPL_LOGIPF], (caddr_t)data,
sizeof(iplused[IPL_LOGIPF]));
#endif
break;
#if (!defined(IPFILTER_LKM) || defined(__NetBSD__)) && defined(_KERNEL)
case SIOCFRENB :
{
u_int enable;
if (!(mode & FWRITE))
error = EPERM;
else {
error = IRCOPY(data, (caddr_t)&enable, sizeof(enable));
if (error)
break;
if (enable)
# if defined(__NetBSD__)
error = ipl_enable();
# else
error = iplattach();
# endif
else
# if defined(__NetBSD__)
error = ipl_disable();
# else
error = ipldetach();
# endif
}
break;
}
#endif
case SIOCSETFF :
if (!(mode & FWRITE))
error = EPERM;
else
error = IRCOPY(data, (caddr_t)&fr_flags,
sizeof(fr_flags));
break;
case SIOCGETFF :
error = IWCOPY((caddr_t)&fr_flags, data, sizeof(fr_flags));
break;
case SIOCINAFR :
case SIOCRMAFR :
case SIOCADAFR :
case SIOCZRLST :
if (!(mode & FWRITE))
error = EPERM;
else
error = frrequest(unit, cmd, data, fr_active);
break;
case SIOCINIFR :
case SIOCRMIFR :
case SIOCADIFR :
if (!(mode & FWRITE))
error = EPERM;
else
error = frrequest(unit, cmd, data, 1 - fr_active);
break;
case SIOCSWAPA :
if (!(mode & FWRITE))
error = EPERM;
else {
bzero((char *)frcache, sizeof(frcache[0]) * 2);
*(u_int *)data = fr_active;
fr_active = 1 - fr_active;
}
break;
case SIOCGETFS :
{
friostat_t fio;
fr_getstat(&fio);
error = IWCOPYPTR((caddr_t)&fio, data, sizeof(fio));
if (error)
error = EFAULT;
break;
}
case SIOCFRZST :
if (!(mode & FWRITE))
error = EPERM;
else
error = frzerostats(data);
break;
case SIOCIPFFL :
if (!(mode & FWRITE))
error = EPERM;
else {
error = IRCOPY(data, (caddr_t)&tmp, sizeof(tmp));
if (!error) {
tmp = frflush(unit, tmp);
error = IWCOPY((caddr_t)&tmp, data,
sizeof(tmp));
}
}
break;
case SIOCSTLCK :
error = IRCOPY(data, (caddr_t)&tmp, sizeof(tmp));
if (!error) {
fr_state_lock = tmp;
fr_nat_lock = tmp;
fr_frag_lock = tmp;
fr_auth_lock = tmp;
} else
error = EFAULT;
break;
#ifdef IPFILTER_LOG
case SIOCIPFFB :
if (!(mode & FWRITE))
error = EPERM;
else
*(int *)data = ipflog_clear(unit);
break;
#endif /* IPFILTER_LOG */
case SIOCGFRST :
error = IWCOPYPTR((caddr_t)ipfr_fragstats(), data,
sizeof(ipfrstat_t));
if (error)
error = EFAULT;
break;
case SIOCAUTHW :
case SIOCAUTHR :
if (!(mode & FWRITE)) {
error = EPERM;
break;
}
case SIOCFRSYN :
if (!(mode & FWRITE))
error = EPERM;
else {
#if defined(_KERNEL) && defined(__sgi)
ipfsync();
#endif
frsync();
}
break;
default :
error = EINVAL;
break;
}
SPL_X(s);
return error;
}
void fr_forgetifp(ifp)
void *ifp;
{
register frentry_t *f;
WRITE_ENTER(&ipf_mutex);
for (f = ipacct[0][fr_active]; (f != NULL); f = f->fr_next)
if (f->fr_ifa == ifp)
f->fr_ifa = (void *)-1;
for (f = ipacct[1][fr_active]; (f != NULL); f = f->fr_next)
if (f->fr_ifa == ifp)
f->fr_ifa = (void *)-1;
for (f = ipfilter[0][fr_active]; (f != NULL); f = f->fr_next)
if (f->fr_ifa == ifp)
f->fr_ifa = (void *)-1;
for (f = ipfilter[1][fr_active]; (f != NULL); f = f->fr_next)
if (f->fr_ifa == ifp)
f->fr_ifa = (void *)-1;
#ifdef USE_INET6
for (f = ipacct6[0][fr_active]; (f != NULL); f = f->fr_next)
if (f->fr_ifa == ifp)
f->fr_ifa = (void *)-1;
for (f = ipacct6[1][fr_active]; (f != NULL); f = f->fr_next)
if (f->fr_ifa == ifp)
f->fr_ifa = (void *)-1;
for (f = ipfilter6[0][fr_active]; (f != NULL); f = f->fr_next)
if (f->fr_ifa == ifp)
f->fr_ifa = (void *)-1;
for (f = ipfilter6[1][fr_active]; (f != NULL); f = f->fr_next)
if (f->fr_ifa == ifp)
f->fr_ifa = (void *)-1;
#endif
RWLOCK_EXIT(&ipf_mutex);
ip_natsync(ifp);
}
static int frrequest(unit, req, data, set)
int unit;
#if defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003)
u_long req;
#else
int req;
#endif
int set;
caddr_t data;
{
register frentry_t *fp, *f, **fprev;
register frentry_t **ftail;
frgroup_t *fg = NULL;
int error = 0, in, i;
u_int *p, *pp;
frentry_t frd;
frdest_t *fdp;
u_int group;
fp = &frd;
error = IRCOPYPTR(data, (caddr_t)fp, sizeof(*fp));
if (error)
return EFAULT;
fp->fr_ref = 0;
#if (BSD >= 199306) && defined(_KERNEL)
if ((securelevel > 0) && (fp->fr_func != NULL))
return EPERM;
#endif
/*
* Check that the group number does exist and that if a head group
* has been specified, doesn't exist.
*/
if ((req != SIOCZRLST) && ((req == SIOCINAFR) || (req == SIOCINIFR) ||
(req == SIOCADAFR) || (req == SIOCADIFR)) && fp->fr_grhead &&
fr_findgroup((u_int)fp->fr_grhead, fp->fr_flags, unit, set, NULL))
return EEXIST;
if ((req != SIOCZRLST) && fp->fr_group &&
!fr_findgroup((u_int)fp->fr_group, fp->fr_flags, unit, set, NULL))
return ESRCH;
in = (fp->fr_flags & FR_INQUE) ? 0 : 1;
if (unit == IPL_LOGAUTH)
ftail = fprev = &ipauth;
else if ((fp->fr_flags & FR_ACCOUNT) && (fp->fr_v == 4))
ftail = fprev = &ipacct[in][set];
else if ((fp->fr_flags & (FR_OUTQUE|FR_INQUE)) && (fp->fr_v == 4))
ftail = fprev = &ipfilter[in][set];
#ifdef USE_INET6
else if ((fp->fr_flags & FR_ACCOUNT) && (fp->fr_v == 6))
ftail = fprev = &ipacct6[in][set];
else if ((fp->fr_flags & (FR_OUTQUE|FR_INQUE)) && (fp->fr_v == 6))
ftail = fprev = &ipfilter6[in][set];
#endif
else
return ESRCH;
if ((group = fp->fr_group)) {
if (!(fg = fr_findgroup(group, fp->fr_flags, unit, set, NULL)))
return ESRCH;
ftail = fprev = fg->fg_start;
}
bzero((char *)frcache, sizeof(frcache[0]) * 2);
for (i = 0; i < 4; i++) {
if ((fp->fr_ifnames[i][1] == '\0') &&
((fp->fr_ifnames[i][0] == '-') ||
(fp->fr_ifnames[i][0] == '*'))) {
fp->fr_ifas[i] = NULL;
} else if (*fp->fr_ifnames[i]) {
fp->fr_ifas[i] = GETUNIT(fp->fr_ifnames[i], fp->fr_v);
if (!fp->fr_ifas[i])
fp->fr_ifas[i] = (void *)-1;
}
}
fdp = &fp->fr_dif;
fp->fr_flags &= ~FR_DUP;
if (*fdp->fd_ifname) {
fdp->fd_ifp = GETUNIT(fdp->fd_ifname, fp->fr_v);
if (!fdp->fd_ifp)
fdp->fd_ifp = (struct ifnet *)-1;
else
fp->fr_flags |= FR_DUP;
}
fdp = &fp->fr_tif;
if (*fdp->fd_ifname) {
fdp->fd_ifp = GETUNIT(fdp->fd_ifname, fp->fr_v);
if (!fdp->fd_ifp)
fdp->fd_ifp = (struct ifnet *)-1;
}
/*
* Look for a matching filter rule, but don't include the next or
* interface pointer in the comparison (fr_next, fr_ifa).
*/
for (fp->fr_cksum = 0, p = (u_int *)&fp->fr_ip, pp = &fp->fr_cksum;
p < pp; p++)
fp->fr_cksum += *p;
for (; (f = *ftail); ftail = &f->fr_next)
if ((fp->fr_cksum == f->fr_cksum) &&
!bcmp((char *)&f->fr_ip, (char *)&fp->fr_ip, FR_CMPSIZ))
break;
/*
* If zero'ing statistics, copy current to caller and zero.
*/
if (req == SIOCZRLST) {
if (!f)
return ESRCH;
error = IWCOPYPTR((caddr_t)f, data, sizeof(*f));
if (error)
return EFAULT;
f->fr_hits = 0;
f->fr_bytes = 0;
return 0;
}
if (!f) {
if (req != SIOCINAFR && req != SIOCINIFR)
while ((f = *ftail))
ftail = &f->fr_next;
else {
if (fp->fr_hits) {
ftail = fprev;
while (--fp->fr_hits && (f = *ftail))
ftail = &f->fr_next;
}
f = NULL;
}
}
if (req == SIOCRMAFR || req == SIOCRMIFR) {
if (!f)
error = ESRCH;
else {
/*
* Only return EBUSY if there is a group list, else
* it's probably just state information referencing
* the rule.
*/
if ((f->fr_ref > 1) && f->fr_grp)
return EBUSY;
if (fg && fg->fg_head)
fg->fg_head->fr_ref--;
if (f->fr_grhead)
fr_delgroup((u_int)f->fr_grhead, fp->fr_flags,
unit, set);
fixskip(fprev, f, -1);
*ftail = f->fr_next;
f->fr_next = NULL;
f->fr_ref--;
if (f->fr_ref == 0)
KFREE(f);
}
} else {
if (f)
error = EEXIST;
else {
KMALLOC(f, frentry_t *);
if (f != NULL) {
if (fg && fg->fg_head)
fg->fg_head->fr_ref++;
bcopy((char *)fp, (char *)f, sizeof(*f));
f->fr_ref = 1;
f->fr_hits = 0;
f->fr_next = *ftail;
*ftail = f;
if (req == SIOCINIFR || req == SIOCINAFR)
fixskip(fprev, f, 1);
f->fr_grp = NULL;
if ((group = f->fr_grhead))
fg = fr_addgroup(group, f, unit, set);
} else
error = ENOMEM;
}
}
return (error);
}
#ifdef _KERNEL
/*
* routines below for saving IP headers to buffer
*/
# ifdef __sgi
# ifdef _KERNEL
int IPL_EXTERN(open)(dev_t *pdev, int flags, int devtype, cred_t *cp)
# else
int IPL_EXTERN(open)(dev_t dev, int flags)
# endif
# else
int IPL_EXTERN(open)(dev, flags
# if ((_BSDI_VERSION >= 199510) || (BSD >= 199506) || (NetBSD >= 199511) || \
(__FreeBSD_version >= 220000) || defined(__OpenBSD__)) && defined(_KERNEL)
, devtype, p)
int devtype;
struct proc *p;
# else
)
# endif
dev_t dev;
int flags;
# endif /* __sgi */
{
# if defined(__sgi) && defined(_KERNEL)
u_int min = geteminor(*pdev);
# else
u_int min = GET_MINOR(dev);
# endif
if (IPL_LOGMAX < min)
min = ENXIO;
else
min = 0;
return min;
}
# ifdef __sgi
int IPL_EXTERN(close)(dev_t dev, int flags, int devtype, cred_t *cp)
#else
int IPL_EXTERN(close)(dev, flags
# if ((_BSDI_VERSION >= 199510) || (BSD >= 199506) || (NetBSD >= 199511) || \
(__FreeBSD_version >= 220000) || defined(__OpenBSD__)) && defined(_KERNEL)
, devtype, p)
int devtype;
struct proc *p;
# else
)
# endif
dev_t dev;
int flags;
# endif /* __sgi */
{
u_int min = GET_MINOR(dev);
if (IPL_LOGMAX < min)
min = ENXIO;
else
min = 0;
return min;
}
/*
* iplread/ipllog
* both of these must operate with at least splnet() lest they be
* called during packet processing and cause an inconsistancy to appear in
* the filter lists.
*/
# ifdef __sgi
int IPL_EXTERN(read)(dev_t dev, uio_t *uio, cred_t *crp)
# else
# if BSD >= 199306
int IPL_EXTERN(read)(dev, uio, ioflag)
int ioflag;
# else
int IPL_EXTERN(read)(dev, uio)
# endif
dev_t dev;
register struct uio *uio;
# endif /* __sgi */
{
# ifdef IPFILTER_LOG
return ipflog_read(GET_MINOR(dev), uio);
# else
return ENXIO;
# endif
}
/*
* send_reset - this could conceivably be a call to tcp_respond(), but that
* requires a large amount of setting up and isn't any more efficient.
*/
int send_reset(oip, fin)
struct ip *oip;
fr_info_t *fin;
{
struct tcphdr *tcp, *tcp2;
int tlen = 0, hlen;
struct mbuf *m;
#ifdef USE_INET6
ip6_t *ip6, *oip6 = (ip6_t *)oip;
#endif
ip_t *ip;
tcp = (struct tcphdr *)fin->fin_dp;
if (tcp->th_flags & TH_RST)
return -1; /* feedback loop */
# if (BSD < 199306) || defined(__sgi)
m = m_get(M_DONTWAIT, MT_HEADER);
# else
m = m_gethdr(M_DONTWAIT, MT_HEADER);
# endif
if (m == NULL)
return ENOBUFS;
if (m == NULL)
return -1;
tlen = fin->fin_dlen - (tcp->th_off << 2) +
((tcp->th_flags & TH_SYN) ? 1 : 0) +
((tcp->th_flags & TH_FIN) ? 1 : 0);
#ifdef USE_INET6
hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t);
#else
hlen = sizeof(ip_t);
#endif
m->m_len = sizeof(*tcp2) + hlen;
# if BSD >= 199306
m->m_data += max_linkhdr;
m->m_pkthdr.len = m->m_len;
m->m_pkthdr.rcvif = (struct ifnet *)0;
# endif
ip = mtod(m, struct ip *);
# ifdef USE_INET6
ip6 = (ip6_t *)ip;
# endif
bzero((char *)ip, sizeof(*tcp2) + hlen);
tcp2 = (struct tcphdr *)((char *)ip + hlen);
tcp2->th_sport = tcp->th_dport;
tcp2->th_dport = tcp->th_sport;
if (tcp->th_flags & TH_ACK) {
tcp2->th_seq = tcp->th_ack;
tcp2->th_flags = TH_RST;
} else {
tcp2->th_ack = ntohl(tcp->th_seq);
tcp2->th_ack += tlen;
tcp2->th_ack = htonl(tcp2->th_ack);
tcp2->th_flags = TH_RST|TH_ACK;
}
tcp2->th_off = sizeof(*tcp2) >> 2;
# ifdef USE_INET6
if (fin->fin_v == 6) {
ip6->ip6_plen = htons(sizeof(struct tcphdr));
ip6->ip6_nxt = IPPROTO_TCP;
ip6->ip6_src = oip6->ip6_dst;
ip6->ip6_dst = oip6->ip6_src;
tcp2->th_sum = in6_cksum(m, IPPROTO_TCP,
sizeof(*ip6), sizeof(*tcp2));
return send_ip(oip, fin, &m);
}
# endif
ip->ip_p = IPPROTO_TCP;
ip->ip_len = htons(sizeof(struct tcphdr));
ip->ip_src.s_addr = oip->ip_dst.s_addr;
ip->ip_dst.s_addr = oip->ip_src.s_addr;
tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2));
ip->ip_len = hlen + sizeof(*tcp2);
return send_ip(oip, fin, &m);
}
/*
* Send an IP(v4/v6) datagram out into the network
*/
static int send_ip(oip, fin, mp)
ip_t *oip;
fr_info_t *fin;
struct mbuf **mp;
{
struct mbuf *m = *mp;
int error, hlen;
fr_info_t frn;
ip_t *ip;
bzero((char *)&frn, sizeof(frn));
frn.fin_ifp = fin->fin_ifp;
frn.fin_v = fin->fin_v;
frn.fin_out = fin->fin_out;
frn.fin_mp = fin->fin_mp;
ip = mtod(m, ip_t *);
hlen = sizeof(*ip);
ip->ip_v = fin->fin_v;
if (ip->ip_v == 4) {
ip->ip_hl = (sizeof(*oip) >> 2);
ip->ip_v = IPVERSION;
ip->ip_tos = oip->ip_tos;
ip->ip_id = oip->ip_id;
# if defined(__NetBSD__) || defined(__OpenBSD__)
if (ip_mtudisc != 0)
ip->ip_off = IP_DF;
# else
# if defined(__sgi)
if (ip->ip_p == IPPROTO_TCP && tcp_mtudisc != 0)
ip->ip_off = IP_DF;
# endif
# endif
# if (BSD < 199306) || defined(__sgi)
ip->ip_ttl = tcp_ttl;
# else
ip->ip_ttl = ip_defttl;
# endif
ip->ip_sum = 0;
frn.fin_dp = (char *)(ip + 1);
}
# ifdef USE_INET6
else if (ip->ip_v == 6) {
ip6_t *ip6 = (ip6_t *)ip;
hlen = sizeof(*ip6);
ip6->ip6_hlim = 127;
frn.fin_dp = (char *)(ip6 + 1);
}
# endif
# ifdef IPSEC
m->m_pkthdr.rcvif = NULL;
# endif
fr_makefrip(hlen, ip, &frn);
error = ipfr_fastroute(m, mp, &frn, NULL);
return error;
}
int send_icmp_err(oip, type, fin, dst)
ip_t *oip;
int type;
fr_info_t *fin;
int dst;
{
int err, hlen = 0, xtra = 0, iclen, ohlen = 0, avail, code;
u_short shlen, slen = 0, soff = 0;
struct in_addr dst4;
struct icmp *icmp;
struct mbuf *m;
void *ifp;
#ifdef USE_INET6
ip6_t *ip6, *oip6 = (ip6_t *)oip;
struct in6_addr dst6;
#endif
ip_t *ip;
if ((type < 0) || (type > ICMP_MAXTYPE))
return -1;
code = fin->fin_icode;
#ifdef USE_INET6
if ((code < 0) || (code > sizeof(icmptoicmp6unreach)/sizeof(int)))
return -1;
#endif
avail = 0;
m = NULL;
ifp = fin->fin_ifp;
if (fin->fin_v == 4) {
if ((oip->ip_p == IPPROTO_ICMP) &&
!(fin->fin_fi.fi_fl & FI_SHORT))
switch (ntohs(fin->fin_data[0]) >> 8)
{
case ICMP_ECHO :
case ICMP_TSTAMP :
case ICMP_IREQ :
case ICMP_MASKREQ :
break;
default :
return 0;
}
# if (BSD < 199306) || defined(__sgi)
avail = MLEN;
m = m_get(M_DONTWAIT, MT_HEADER);
# else
avail = MHLEN;
m = m_gethdr(M_DONTWAIT, MT_HEADER);
# endif
if (m == NULL)
return ENOBUFS;
if (dst == 0) {
if (fr_ifpaddr(4, ifp, &dst4) == -1)
return -1;
} else
dst4.s_addr = oip->ip_dst.s_addr;
hlen = sizeof(ip_t);
ohlen = oip->ip_hl << 2;
xtra = 8;
}
#ifdef USE_INET6
else if (fin->fin_v == 6) {
hlen = sizeof(ip6_t);
ohlen = sizeof(ip6_t);
type = icmptoicmp6types[type];
if (type == ICMP6_DST_UNREACH)
code = icmptoicmp6unreach[code];
MGETHDR(m, M_DONTWAIT, MT_HEADER);
if (!m)
return ENOBUFS;
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_freem(m);
return ENOBUFS;
}
# ifdef M_TRAILINGSPACE
m->m_len = 0;
avail = M_TRAILINGSPACE(m);
# else
avail = (m->m_flags & M_EXT) ? MCLBYTES : MHLEN;
# endif
xtra = MIN(ntohs(oip6->ip6_plen) + sizeof(ip6_t),
avail - hlen - sizeof(*icmp) - max_linkhdr);
if (dst == 0) {
if (fr_ifpaddr(6, ifp, (struct in_addr *)&dst6) == -1)
return -1;
} else
dst6 = oip6->ip6_dst;
}
#endif
iclen = hlen + sizeof(*icmp);
# if BSD >= 199306
avail -= (max_linkhdr + iclen);
m->m_data += max_linkhdr;
m->m_pkthdr.rcvif = (struct ifnet *)0;
if (xtra > avail)
xtra = avail;
iclen += xtra;
m->m_pkthdr.len = iclen;
#else
avail -= (m->m_off + iclen);
if (xtra > avail)
xtra = avail;
iclen += xtra;
#endif
m->m_len = iclen;
ip = mtod(m, ip_t *);
icmp = (struct icmp *)((char *)ip + hlen);
bzero((char *)ip, iclen);
icmp->icmp_type = type;
icmp->icmp_code = fin->fin_icode;
icmp->icmp_cksum = 0;
#ifdef icmp_nextmtu
if (type == ICMP_UNREACH &&
fin->fin_icode == ICMP_UNREACH_NEEDFRAG && ifp)
icmp->icmp_nextmtu = htons(((struct ifnet *) ifp)->if_mtu);
#endif
if (avail) {
bcopy((char *)oip, (char *)&icmp->icmp_ip, MIN(ohlen, avail));
avail -= MIN(ohlen, avail);
}
#ifdef USE_INET6
ip6 = (ip6_t *)ip;
if (fin->fin_v == 6) {
ip6->ip6_flow = 0;
ip6->ip6_plen = htons(iclen - hlen);
ip6->ip6_nxt = IPPROTO_ICMPV6;
ip6->ip6_hlim = 0;
ip6->ip6_src = dst6;
ip6->ip6_dst = oip6->ip6_src;
if (avail)
bcopy((char *)oip + ohlen,
(char *)&icmp->icmp_ip + ohlen, avail);
icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6,
sizeof(*ip6), iclen - hlen);
} else
#endif
{
slen = oip->ip_len;
oip->ip_len = htons(oip->ip_len);
soff = oip->ip_off;
oip->ip_off = htons(ip->ip_off);
ip->ip_src.s_addr = dst4.s_addr;
ip->ip_dst.s_addr = oip->ip_src.s_addr;
if (avail > 8)
avail = 8;
if (avail)
bcopy((char *)oip + ohlen,
(char *)&icmp->icmp_ip + ohlen, avail);
icmp->icmp_cksum = ipf_cksum((u_short *)icmp,
sizeof(*icmp) + 8);
ip->ip_len = iclen;
ip->ip_p = IPPROTO_ICMP;
}
shlen = fin->fin_hlen;
fin->fin_hlen = hlen;
err = send_ip(oip, fin, &m);
fin->fin_hlen = shlen;
#ifdef USE_INET6
if (fin->fin_v == 4)
#endif
{
oip->ip_len = slen;
oip->ip_off = soff;
}
return err;
}
# if !defined(IPFILTER_LKM) && !defined(__sgi) && \
(!defined(__FreeBSD_version) || (__FreeBSD_version < 300000))
# if (BSD < 199306)
int iplinit __P((void));
int
# else
void iplinit __P((void));
void
# endif
iplinit()
{
# if defined(__NetBSD__)
if (ipl_enable() != 0)
# else
if (iplattach() != 0)
# endif
{
printf("IP Filter failed to attach\n");
}
ip_init();
}
# endif /* ! __NetBSD__ */
/*
* Return the length of the entire mbuf.
*/
size_t mbufchainlen(m0)
register struct mbuf *m0;
{
#if BSD >= 199306
return m0->m_pkthdr.len;
#else
register size_t len = 0;
for (; m0; m0 = m0->m_next)
len += m0->m_len;
return len;
#endif
}
int ipfr_fastroute(m0, mpp, fin, fdp)
struct mbuf *m0, **mpp;
fr_info_t *fin;
frdest_t *fdp;
{
register struct ip *ip, *mhip;
register struct mbuf *m = m0;
register struct route *ro;
int len, off, error = 0, hlen, code;
struct ifnet *ifp, *sifp;
struct sockaddr_in *dst;
struct route iproute;
frentry_t *fr;
ip = NULL;
ro = NULL;
ifp = NULL;
ro = &iproute;
ro->ro_rt = NULL;
#ifdef USE_INET6
if (fin->fin_v == 6) {
error = ipfr_fastroute6(m0, mpp, fin, fdp);
if (error != 0)
goto bad;
goto done;
}
#else
if (fin->fin_v == 6)
goto bad;
#endif
#ifdef M_WRITABLE
/*
* HOT FIX/KLUDGE:
*
* If the mbuf we're about to send is not writable (because of
* a cluster reference, for example) we'll need to make a copy
* of it since this routine modifies the contents.
*
* If you have non-crappy network hardware that can transmit data
* from the mbuf, rather than making a copy, this is gonna be a
* problem.
*/
if (M_WRITABLE(m) == 0) {
if ((m0 = m_dup(m, M_DONTWAIT)) != NULL) {
m_freem(*mpp);
*mpp = m0;
m = m0;
} else {
error = ENOBUFS;
m_freem(*mpp);
goto done;
}
}
#endif
hlen = fin->fin_hlen;
ip = mtod(m0, struct ip *);
#if defined(__NetBSD__) && defined(M_CSUM_IPv4)
/*
* Clear any in-bound checksum flags for this packet.
*/
# if (__NetBSD_Version__ > 105009999)
m0->m_pkthdr.csum_flags = 0;
# else
m0->m_pkthdr.csuminfo = 0;
# endif
#endif /* __NetBSD__ && M_CSUM_IPv4 */
/*
* Route packet.
*/
#ifdef __sgi
ROUTE_RDLOCK();
#endif
bzero((caddr_t)ro, sizeof (*ro));
dst = (struct sockaddr_in *)&ro->ro_dst;
dst->sin_family = AF_INET;
dst->sin_addr = ip->ip_dst;
fr = fin->fin_fr;
if (fdp != NULL)
ifp = fdp->fd_ifp;
else
ifp = fin->fin_ifp;
/*
* In case we're here due to "to <if>" being used with "keep state",
* check that we're going in the correct direction.
*/
if ((fr != NULL) && (fin->fin_rev != 0)) {
if ((ifp != NULL) && (fdp == &fr->fr_tif))
return 0;
} else if (fdp != NULL) {
if (fdp->fd_ip.s_addr != 0)
dst->sin_addr = fdp->fd_ip;
}
# if BSD >= 199306
dst->sin_len = sizeof(*dst);
# endif
# if (BSD >= 199306) && !defined(__NetBSD__) && !defined(__bsdi__) && \
!defined(__OpenBSD__)
# ifdef RTF_CLONING
rtalloc_ign(ro, RTF_CLONING);
# else
rtalloc_ign(ro, RTF_PRCLONING);
# endif
# else
rtalloc(ro);
# endif
#ifdef __sgi
ROUTE_UNLOCK();
#endif
if (!ifp) {
if (!fr || !(fr->fr_flags & FR_FASTROUTE)) {
error = -2;
goto bad;
}
}
if ((ifp == NULL) && (ro->ro_rt != NULL))
ifp = ro->ro_rt->rt_ifp;
if ((ro->ro_rt == NULL) || (ifp == NULL)) {
if (in_localaddr(ip->ip_dst))
error = EHOSTUNREACH;
else
error = ENETUNREACH;
goto bad;
}
if (ro->ro_rt->rt_flags & RTF_GATEWAY) {
#if BSD >= 199306
dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
#else
dst = (struct sockaddr_in *)&ro->ro_rt->rt_gateway;
#endif
}
ro->ro_rt->rt_use++;
/*
* For input packets which are being "fastrouted", they won't
* go back through output filtering and miss their chance to get
* NAT'd and counted.
*/
if (fin->fin_out == 0) {
sifp = fin->fin_ifp;
fin->fin_ifp = ifp;
fin->fin_out = 1;
if ((fin->fin_fr = ipacct[1][fr_active]) &&
(fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) {
ATOMIC_INCL(frstats[1].fr_acct);
}
fin->fin_fr = NULL;
if (!fr || !(fr->fr_flags & FR_RETMASK))
(void) fr_checkstate(ip, fin);
(void) ip_natout(ip, fin);
fin->fin_ifp = sifp;
}
ip->ip_sum = 0;
/*
* If small enough for interface, can just send directly.
*/
if (ip->ip_len <= ifp->if_mtu) {
# ifndef sparc
# if (!defined(__FreeBSD__) && !(_BSDI_VERSION >= 199510)) && \
!(__NetBSD_Version__ >= 105110000)
ip->ip_id = htons(ip->ip_id);
# endif
ip->ip_len = htons(ip->ip_len);
ip->ip_off = htons(ip->ip_off);
# endif
# if defined(__NetBSD__) && defined(M_CSUM_IPv4)
# if (__NetBSD_Version__ > 105009999)
if (ifp->if_csum_flags_tx & IFCAP_CSUM_IPv4)
m->m_pkthdr.csum_flags |= M_CSUM_IPv4;
else if (ip->ip_sum == 0)
ip->ip_sum = in_cksum(m, hlen);
# else
if (ifp->if_capabilities & IFCAP_CSUM_IPv4)
m->m_pkthdr.csuminfo |= M_CSUM_IPv4;
else if (ip->ip_sum == 0)
ip->ip_sum = in_cksum(m, hlen);
# endif
# else
if (!ip->ip_sum)
ip->ip_sum = in_cksum(m, hlen);
# endif /* __NetBSD__ && M_CSUM_IPv4 */
# if (BSD >= 199306) || (defined(IRIX) && (IRIX >= 605))
error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst,
ro->ro_rt);
# else
error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst);
# endif
goto done;
}
/*
* Too large for interface; fragment if possible.
* Must be able to put at least 8 bytes per fragment.
*/
if (ip->ip_off & IP_DF) {
error = EMSGSIZE;
goto bad;
}
len = (ifp->if_mtu - hlen) &~ 7;
if (len < 8) {
error = EMSGSIZE;
goto bad;
}
{
int mhlen, firstlen = len;
struct mbuf **mnext = &m->m_act;
/*
* Loop through length of segment after first fragment,
* make new header and copy data of each part and link onto chain.
*/
m0 = m;
mhlen = sizeof (struct ip);
for (off = hlen + len; off < ip->ip_len; off += len) {
# ifdef MGETHDR
MGETHDR(m, M_DONTWAIT, MT_HEADER);
# else
MGET(m, M_DONTWAIT, MT_HEADER);
# endif
if (m == 0) {
error = ENOBUFS;
goto bad;
}
# if BSD >= 199306
m->m_data += max_linkhdr;
# else
m->m_off = MMAXOFF - hlen;
# endif
mhip = mtod(m, struct ip *);
bcopy((char *)ip, (char *)mhip, sizeof(*ip));
if (hlen > sizeof (struct ip)) {
mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
mhip->ip_hl = mhlen >> 2;
}
m->m_len = mhlen;
mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF);
if (ip->ip_off & IP_MF)
mhip->ip_off |= IP_MF;
if (off + len >= ip->ip_len)
len = ip->ip_len - off;
else
mhip->ip_off |= IP_MF;
mhip->ip_len = htons((u_short)(len + mhlen));
m->m_next = m_copy(m0, off, len);
if (m->m_next == 0) {
error = ENOBUFS; /* ??? */
goto sendorfree;
}
# if BSD >= 199306
m->m_pkthdr.len = mhlen + len;
m->m_pkthdr.rcvif = NULL;
# endif
mhip->ip_off = htons((u_short)mhip->ip_off);
mhip->ip_sum = 0;
mhip->ip_sum = in_cksum(m, mhlen);
*mnext = m;
mnext = &m->m_act;
}
/*
* Update first fragment by trimming what's been copied out
* and updating header, then send each fragment (in order).
*/
m_adj(m0, hlen + firstlen - ip->ip_len);
ip->ip_len = htons((u_short)(hlen + firstlen));
ip->ip_off = htons((u_short)(ip->ip_off | IP_MF));
ip->ip_sum = 0;
ip->ip_sum = in_cksum(m0, hlen);
sendorfree:
for (m = m0; m; m = m0) {
m0 = m->m_act;
m->m_act = 0;
if (error == 0)
# if (BSD >= 199306) || (defined(IRIX) && (IRIX >= 605))
error = (*ifp->if_output)(ifp, m,
(struct sockaddr *)dst, ro->ro_rt);
# else
error = (*ifp->if_output)(ifp, m,
(struct sockaddr *)dst);
# endif
else
m_freem(m);
}
}
done:
if (!error)
ipl_frouteok[0]++;
else
ipl_frouteok[1]++;
if (ro->ro_rt != NULL) {
RTFREE(ro->ro_rt);
}
*mpp = NULL;
return error;
bad:
if ((error == EMSGSIZE) && (fin->fin_v == 4)) {
sifp = fin->fin_ifp;
code = fin->fin_icode;
fin->fin_icode = ICMP_UNREACH_NEEDFRAG;
fin->fin_ifp = ifp;
(void) send_icmp_err(ip, ICMP_UNREACH, fin, 1);
fin->fin_ifp = sifp;
fin->fin_icode = code;
}
m_freem(m);
goto done;
}
/*
* Return true or false depending on whether the route to the
* given IP address uses the same interface as the one passed.
*/
int fr_verifysrc(ipa, ifp)
struct in_addr ipa;
void *ifp;
{
struct sockaddr_in *dst;
struct route iproute;
bzero((char *)&iproute, sizeof(iproute));
dst = (struct sockaddr_in *)&iproute.ro_dst;
# if (BSD >= 199306)
dst->sin_len = sizeof(*dst);
# endif
dst->sin_family = AF_INET;
dst->sin_addr = ipa;
# if (BSD >= 199306) && !defined(__NetBSD__) && !defined(__bsdi__) && \
!defined(__OpenBSD__)
# ifdef RTF_CLONING
rtalloc_ign(&iproute, RTF_CLONING);
# else
rtalloc_ign(&iproute, RTF_PRCLONING);
# endif
# else
rtalloc(&iproute);
# endif
if (iproute.ro_rt == NULL)
return 0;
return (ifp == iproute.ro_rt->rt_ifp);
}
# ifdef USE_GETIFNAME
char *
get_ifname(ifp)
struct ifnet *ifp;
{
static char workbuf[64];
sprintf(workbuf, "%s%d", ifp->if_name, ifp->if_unit);
return workbuf;
}
# endif
# if defined(USE_INET6)
/*
* This is the IPv6 specific fastroute code. It doesn't clean up the mbuf's
* or ensure that it is an IPv6 packet that is being forwarded, those are
* expected to be done by the called (ipfr_fastroute).
*/
static int ipfr_fastroute6(m0, mpp, fin, fdp)
struct mbuf *m0, **mpp;
fr_info_t *fin;
frdest_t *fdp;
{
struct route_in6 ip6route;
struct sockaddr_in6 *dst6;
struct route_in6 *ro;
struct ifnet *ifp;
frentry_t *fr;
int error;
ifp = NULL;
ro = &ip6route;
fr = fin->fin_fr;
bzero((caddr_t)ro, sizeof(*ro));
dst6 = (struct sockaddr_in6 *)&ro->ro_dst;
dst6->sin6_family = AF_INET6;
dst6->sin6_len = sizeof(struct sockaddr_in6);
dst6->sin6_addr = fin->fin_fi.fi_src.in6;
if (fdp != NULL)
ifp = fdp->fd_ifp;
if ((fr != NULL) && (fin->fin_rev != 0)) {
if ((ifp != NULL) && (fdp == &fr->fr_tif))
return 0;
} else if (fdp != NULL) {
if (IP6_NOTZERO(&fdp->fd_ip6))
dst6->sin6_addr = fdp->fd_ip6.in6;
}
if ((ifp == NULL) && ((fr == NULL) || !(fr->fr_flags & FR_FASTROUTE)))
return -2;
rtalloc((struct route *)ro);
if ((ifp == NULL) && (ro->ro_rt != NULL))
ifp = ro->ro_rt->rt_ifp;
if ((ro->ro_rt == NULL) || (ifp == NULL) ||
(ifp != ro->ro_rt->rt_ifp)) {
error = EHOSTUNREACH;
} else {
if (ro->ro_rt->rt_flags & RTF_GATEWAY)
dst6 = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway;
ro->ro_rt->rt_use++;
if (m0->m_pkthdr.len <= IN6_LINKMTU(ifp))
error = nd6_output(ifp, fin->fin_ifp, m0, dst6,
ro->ro_rt);
else
error = EMSGSIZE;
}
if (ro->ro_rt != NULL) {
RTFREE(ro->ro_rt);
}
return error;
}
# endif
#else /* #ifdef _KERNEL */
# if defined(__sgi) && (IRIX < 605)
static int no_output __P((struct ifnet *ifp, struct mbuf *m,
struct sockaddr *s))
# else
static int no_output __P((struct ifnet *ifp, struct mbuf *m,
struct sockaddr *s, struct rtentry *rt))
# endif
{
return 0;
}
# ifdef __STDC__
# if defined(__sgi) && (IRIX < 605)
static int write_output __P((struct ifnet *ifp, struct mbuf *m,
struct sockaddr *s))
# else
static int write_output __P((struct ifnet *ifp, struct mbuf *m,
struct sockaddr *s, struct rtentry *rt))
# endif
{
ip_t *ip = (ip_t *)m;
# else
static int write_output(ifp, ip)
struct ifnet *ifp;
ip_t *ip;
{
# endif
char fname[32];
int fd;
# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
(defined(OpenBSD) && (OpenBSD >= 199603))
sprintf(fname, "%s", ifp->if_xname);
# else
sprintf(fname, "%s%d", ifp->if_name, ifp->if_unit);
# endif
fd = open(fname, O_WRONLY|O_APPEND);
if (fd == -1) {
perror("open");
return -1;
}
write(fd, (char *)ip, ntohs(ip->ip_len));
close(fd);
return 0;
}
char *get_ifname(ifp)
struct ifnet *ifp;
{
# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
(defined(OpenBSD) && (OpenBSD >= 199603))
return ifp->if_xname;
# else
static char fullifname[LIFNAMSIZ];
sprintf(fullifname, "%s%d", ifp->if_name, ifp->if_unit);
return fullifname;
# endif
}
struct ifnet *get_unit(ifname, v)
char *ifname;
int v;
{
struct ifnet *ifp, **ifa, **old_ifneta;
for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
(defined(OpenBSD) && (OpenBSD >= 199603))
if (!strncmp(ifname, ifp->if_xname, sizeof(ifp->if_xname)))
# else
char fullname[LIFNAMSIZ];
sprintf(fullname, "%s%d", ifp->if_name, ifp->if_unit);
if (!strcmp(ifname, fullname))
# endif
return ifp;
}
if (!ifneta) {
ifneta = (struct ifnet **)malloc(sizeof(ifp) * 2);
if (!ifneta)
return NULL;
ifneta[1] = NULL;
ifneta[0] = (struct ifnet *)calloc(1, sizeof(*ifp));
if (!ifneta[0]) {
free(ifneta);
return NULL;
}
nifs = 1;
} else {
old_ifneta = ifneta;
nifs++;
ifneta = (struct ifnet **)realloc(ifneta,
(nifs + 1) * sizeof(*ifa));
if (!ifneta) {
free(old_ifneta);
nifs = 0;
return NULL;
}
ifneta[nifs] = NULL;
ifneta[nifs - 1] = (struct ifnet *)malloc(sizeof(*ifp));
if (!ifneta[nifs - 1]) {
nifs--;
return NULL;
}
}
ifp = ifneta[nifs - 1];
# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
(defined(OpenBSD) && (OpenBSD >= 199603))
strncpy(ifp->if_xname, ifname, sizeof(ifp->if_xname));
# else
ifp->if_name = strdup(ifname);
ifname = ifp->if_name;
while (*ifname && !isdigit(*ifname))
ifname++;
if (*ifname && isdigit(*ifname)) {
ifp->if_unit = atoi(ifname);
*ifname = '\0';
} else
ifp->if_unit = -1;
# endif
ifp->if_output = no_output;
return ifp;
}
void init_ifp()
{
struct ifnet *ifp, **ifa;
char fname[32];
int fd;
# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
(defined(OpenBSD) && (OpenBSD >= 199603))
for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
ifp->if_output = write_output;
sprintf(fname, "/tmp/%s", ifp->if_xname);
fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_TRUNC, 0600);
if (fd == -1)
perror("open");
else
close(fd);
}
# else
for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
ifp->if_output = write_output;
sprintf(fname, "/tmp/%s%d", ifp->if_name, ifp->if_unit);
fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_TRUNC, 0600);
if (fd == -1)
perror("open");
else
close(fd);
}
# endif
}
int send_reset(ip, fin)
ip_t *ip;
fr_info_t *fin;
{
verbose("- TCP RST sent\n");
return 0;
}
int send_icmp_err(ip, code, fin, dst)
ip_t *ip;
int code;
fr_info_t *fin;
int dst;
{
verbose("- ICMP UNREACHABLE sent\n");
return 0;
}
void frsync()
{
return;
}
void m_copydata(m, off, len, cp)
mb_t *m;
int off, len;
caddr_t cp;
{
bcopy((char *)m + off, cp, len);
}
int ipfuiomove(buf, len, rwflag, uio)
caddr_t buf;
int len, rwflag;
struct uio *uio;
{
int left, ioc, num, offset;
struct iovec *io;
char *start;
if (rwflag == UIO_READ) {
left = len;
ioc = 0;
offset = uio->uio_offset;
while ((left > 0) && (ioc < uio->uio_iovcnt)) {
io = uio->uio_iov + ioc;
num = io->iov_len;
if (num > left)
num = left;
start = (char *)io->iov_base + offset;
if (start > (char *)io->iov_base + io->iov_len) {
offset -= io->iov_len;
ioc++;
continue;
}
bcopy(buf, start, num);
uio->uio_resid -= num;
uio->uio_offset += num;
left -= num;
if (left > 0)
ioc++;
}
if (left > 0)
return EFAULT;
}
return 0;
}
#endif /* _KERNEL */
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