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freebsd-dev/sys/netinet/ip_fil.c

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/*
* Copyright (C) 1993-1998 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.
*/
#if !defined(lint)
static const char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-1995 Darren Reed";
/*static const char rcsid[] = "@(#)$Id: ip_fil.c,v 2.4.2.14 1999/12/11 05:31:08 darrenr Exp $";*/
static const char rcsid[] = "@(#)$FreeBSD$";
#endif
#ifndef SOLARIS
#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
#endif
#if defined(KERNEL) && !defined(_KERNEL)
# define _KERNEL
#endif
#include <sys/param.h>
#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
defined(_KERNEL)
# include "opt_ipfilter_log.h"
#endif
#if defined(__FreeBSD__) && !defined(__FreeBSD_version)
# if defined(_KERNEL) && !defined(IPFILTER_LKM)
# include <sys/osreldate.h>
# else
# include <osreldate.h>
# endif
#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
#include <sys/uio.h>
#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"
#include "netinet/ip_fil.h"
#include "netinet/ip_proxy.h"
#include "netinet/ip_nat.h"
#include "netinet/ip_frag.h"
#include "netinet/ip_state.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
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
int ipl_inited = 0;
int ipl_unreach = ICMP_UNREACH_FILTER;
u_long ipl_frouteok[2] = {0, 0};
static void frzerostats __P((caddr_t));
#if defined(__NetBSD__) || defined(__OpenBSD__)
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((struct mbuf *, ip_t *));
# ifdef __sgi
extern kmutex_t ipf_rw;
extern KRWLOCK_T ipf_mutex;
# endif
#else
int ipllog __P((void));
void init_ifp __P((void));
# ifdef __sgi
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
#if defined(IPFILTER_LKM)
int fr_running = 1;
#else
int fr_running = 0;
#endif
#if (__FreeBSD_version >= 300000) && defined(_KERNEL)
struct callout_handle ipfr_slowtimer_ch;
#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__ */
#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;
{
if (iplattach() != 0)
printf("IP Filter failed to attach\n");
}
# endif
int iplattach()
{
char *defpass;
int s;
# ifdef __sgi
int error;
# endif
SPL_NET(s);
if (ipl_inited || (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)
return -1;
if (fr_stateinit() == -1)
return -1;
if (appr_init() == -1)
return -1;
# ifdef NETBSD_PF
pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT);
# endif
# ifdef __sgi
error = ipfilter_sgi_attach();
if (error) {
SPL_X(s);
return error;
}
# endif
ipl_inited = 1;
bzero((char *)frcache, sizeof(frcache));
fr_savep = fr_checkp;
fr_checkp = fr_check;
SPL_X(s);
if (fr_pass & FR_PASS)
defpass = "pass";
else if (fr_pass & FR_BLOCK)
defpass = "block";
else
defpass = "no-match -> block";
printf("IP Filter: initialized. Default = %s all, Logging = %s\n",
defpass,
# ifdef IPFILTER_LOG
"enabled");
# else
"disabled");
# endif
printf("%s\n", ipfilter_version);
#ifdef _KERNEL
# if (__FreeBSD_version >= 300000) && defined(_KERNEL)
ipfr_slowtimer_ch = timeout(ipfr_slowtimer, NULL, hz/2);
# else
timeout(ipfr_slowtimer, NULL, hz/2);
# endif
#endif
return 0;
}
/*
* Disable the filter by removing the hooks from the IP input/output
* stream.
*/
int ipldetach()
{
int s, i = FR_INQUE|FR_OUTQUE;
#ifdef _KERNEL
# if (__FreeBSD_version >= 300000)
untimeout(ipfr_slowtimer, NULL, ipfr_slowtimer_ch);
# else
# ifdef __sgi
untimeout(ipfr_slowtimer);
# else
untimeout(ipfr_slowtimer, NULL);
# endif
# endif
#endif
SPL_NET(s);
if (!ipl_inited)
{
printf("IP Filter: not initialized\n");
SPL_X(s);
return 0;
}
printf("IP Filter: unloaded\n");
fr_checkp = fr_savep;
i = frflush(IPL_LOGIPF, i);
ipl_inited = 0;
# ifdef NETBSD_PF
pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT);
# endif
# ifdef __sgi
ipfilter_sgi_detach();
# endif
ipfr_unload();
ip_natunload();
fr_stateunload();
fr_authunload();
SPL_X(s);
return 0;
}
#endif /* _KERNEL */
static void frzerostats(data)
caddr_t data;
{
friostat_t fio;
bcopy((char *)frstats, (char *)fio.f_st,
sizeof(struct filterstats) * 2);
fio.f_fin[0] = ipfilter[0][0];
fio.f_fin[1] = ipfilter[0][1];
fio.f_fout[0] = ipfilter[1][0];
fio.f_fout[1] = ipfilter[1][1];
fio.f_acctin[0] = ipacct[0][0];
fio.f_acctin[1] = ipacct[0][1];
fio.f_acctout[0] = ipacct[1][0];
fio.f_acctout[1] = ipacct[1][1];
fio.f_active = fr_active;
fio.f_froute[0] = ipl_frouteok[0];
fio.f_froute[1] = ipl_frouteok[1];
IWCOPY((caddr_t)&fio, data, sizeof(fio));
bzero((char *)frstats, sizeof(*frstats) * 2);
}
/*
* 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 ((_BSDI_VERSION >= 199510) || (BSD >= 199506) || (NetBSD >= 199511) || \
(__FreeBSD_version >= 220000) || defined(__OpenBSD__)) && defined(_KERNEL)
, 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
SPL_NET(s);
if (unit == IPL_LOGNAT) {
error = nat_ioctl(data, cmd, mode);
SPL_X(s);
return error;
}
if (unit == IPL_LOGSTATE) {
error = fr_state_ioctl(data, cmd, mode);
SPL_X(s);
return error;
}
switch (cmd) {
case FIONREAD :
#ifdef IPFILTER_LOG
IWCOPY((caddr_t)&iplused[IPL_LOGIPF], (caddr_t)data,
sizeof(iplused[IPL_LOGIPF]));
#endif
break;
#if !defined(IPFILTER_LKM) && defined(_KERNEL)
case SIOCFRENB :
{
u_int enable;
if (!(mode & FWRITE))
error = EPERM;
else {
IRCOPY(data, (caddr_t)&enable, sizeof(enable));
if (enable) {
error = iplattach();
if (error == 0)
fr_running = 1;
} else {
error = ipldetach();
if (error == 0)
fr_running = 0;
}
}
break;
}
#endif
case SIOCSETFF :
if (!(mode & FWRITE))
error = EPERM;
else
IRCOPY(data, (caddr_t)&fr_flags, sizeof(fr_flags));
break;
case SIOCGETFF :
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 :
{
struct friostat fio;
bcopy((char *)frstats, (char *)fio.f_st,
sizeof(struct filterstats) * 2);
fio.f_fin[0] = ipfilter[0][0];
fio.f_fin[1] = ipfilter[0][1];
fio.f_fout[0] = ipfilter[1][0];
fio.f_fout[1] = ipfilter[1][1];
fio.f_acctin[0] = ipacct[0][0];
fio.f_acctin[1] = ipacct[0][1];
fio.f_acctout[0] = ipacct[1][0];
fio.f_acctout[1] = ipacct[1][1];
fio.f_auth = ipauth;
fio.f_active = fr_active;
fio.f_froute[0] = ipl_frouteok[0];
fio.f_froute[1] = ipl_frouteok[1];
fio.f_running = fr_running;
fio.f_groups[0][0] = ipfgroups[0][0];
fio.f_groups[0][1] = ipfgroups[0][1];
fio.f_groups[1][0] = ipfgroups[1][0];
fio.f_groups[1][1] = ipfgroups[1][1];
fio.f_groups[2][0] = ipfgroups[2][0];
fio.f_groups[2][1] = ipfgroups[2][1];
#ifdef IPFILTER_LOG
fio.f_logging = 1;
#else
fio.f_logging = 0;
#endif
fio.f_defpass = fr_pass;
strncpy(fio.f_version, ipfilter_version,
sizeof(fio.f_version));
IWCOPY((caddr_t)&fio, data, sizeof(fio));
break;
}
case SIOCFRZST :
if (!(mode & FWRITE))
error = EPERM;
else
frzerostats(data);
break;
case SIOCIPFFL :
if (!(mode & FWRITE))
error = EPERM;
else {
IRCOPY(data, (caddr_t)&tmp, sizeof(tmp));
tmp = frflush(unit, tmp);
IWCOPY((caddr_t)&tmp, data, sizeof(tmp));
}
break;
#ifdef IPFILTER_LOG
case SIOCIPFFB :
if (!(mode & FWRITE))
error = EPERM;
else
*(int *)data = ipflog_clear(unit);
break;
#endif /* IPFILTER_LOG */
case SIOCGFRST :
IWCOPY((caddr_t)ipfr_fragstats(), data, sizeof(ipfrstat_t));
break;
case SIOCAUTHW :
case SIOCAUTHR :
if (!(mode & FWRITE)) {
error = EPERM;
break;
}
case SIOCATHST :
error = fr_auth_ioctl(data, cmd, NULL, NULL);
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;
RWLOCK_EXIT(&ipf_mutex);
ip_natsync(ifp);
}
static int frrequest(unit, req, data, set)
int unit;
#if defined(__NetBSD__) || defined(__OpenBSD__)
u_long req;
#else
int req;
#endif
int set;
caddr_t data;
{
register frentry_t *fp, *f, **fprev;
register frentry_t **ftail;
frentry_t frd;
frdest_t *fdp;
frgroup_t *fg = NULL;
int error = 0, in;
u_int group;
fp = &frd;
IRCOPY(data, (caddr_t)fp, sizeof(*fp));
fp->fr_ref = 0;
/*
* Check that the group number does exist and that if a head group
* has been specified, doesn't exist.
*/
if ((req != SIOCZRLST) && 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)
ftail = fprev = &ipacct[in][set];
else if (fp->fr_flags & (FR_OUTQUE|FR_INQUE))
ftail = fprev = &ipfilter[in][set];
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);
if (*fp->fr_ifname) {
fp->fr_ifa = GETUNIT(fp->fr_ifname);
if (!fp->fr_ifa)
fp->fr_ifa = (void *)-1;
}
#if BSD >= 199306
if (*fp->fr_oifname) {
fp->fr_oifa = GETUNIT(fp->fr_oifname);
if (!fp->fr_oifa)
fp->fr_oifa = (void *)-1;
}
#endif
fdp = &fp->fr_dif;
fp->fr_flags &= ~FR_DUP;
if (*fdp->fd_ifname) {
fdp->fd_ifp = GETUNIT(fdp->fd_ifname);
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);
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 (; (f = *ftail); ftail = &f->fr_next)
if (bcmp((char *)&f->fr_ip, (char *)&fp->fr_ip,
FR_CMPSIZ) == 0)
break;
/*
* If zero'ing statistics, copy current to caller and zero.
*/
if (req == SIOCZRLST) {
if (!f)
return ESRCH;
IWCOPY((caddr_t)f, data, sizeof(*f));
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)
while (--fp->fr_hits && (f = *ftail))
ftail = &f->fr_next;
f = NULL;
}
}
if (req == SIOCDELFR || req == SIOCRMIFR) {
if (!f)
error = ESRCH;
else {
if (f->fr_ref > 1)
return EBUSY;
if (fg && fg->fg_head)
fg->fg_head->fr_ref--;
if (unit == IPL_LOGAUTH)
return fr_auth_ioctl(data, req, f, ftail);
if (f->fr_grhead)
fr_delgroup((u_int)f->fr_grhead, fp->fr_flags,
unit, set);
fixskip(fprev, f, -1);
*ftail = f->fr_next;
KFREE(f);
}
} else {
if (f)
error = EEXIST;
else {
if (unit == IPL_LOGAUTH)
return fr_auth_ioctl(data, req, fp, ftail);
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(fin, oip)
fr_info_t *fin;
struct ip *oip;
{
struct tcphdr *tcp, *tcp2;
struct tcpiphdr *tp;
struct mbuf *m;
int tlen = 0;
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;
if (tcp->th_flags & TH_SYN)
tlen = 1;
m->m_len = sizeof(*tcp2) + sizeof(*ip);
# if BSD >= 199306
m->m_data += max_linkhdr;
m->m_pkthdr.len = m->m_len;
m->m_pkthdr.rcvif = (struct ifnet *)0;
# endif
bzero(mtod(m, char *), sizeof(struct tcpiphdr));
ip = mtod(m, struct ip *);
tp = mtod(m, struct tcpiphdr *);
tcp2 = (struct tcphdr *)((char *)ip + sizeof(*ip));
ip->ip_src.s_addr = oip->ip_dst.s_addr;
ip->ip_dst.s_addr = oip->ip_src.s_addr;
tcp2->th_dport = tcp->th_sport;
tcp2->th_sport = tcp->th_dport;
tcp2->th_ack = ntohl(tcp->th_seq);
tcp2->th_ack += tlen;
tcp2->th_ack = htonl(tcp2->th_ack);
tcp2->th_off = sizeof(*tcp2) >> 2;
tcp2->th_flags = TH_RST|TH_ACK;
tp->ti_pr = oip->ip_p;
tp->ti_len = htons(sizeof(struct tcphdr));
tcp2->th_sum = in_cksum(m, sizeof(*ip) + sizeof(*tcp2));
ip->ip_tos = oip->ip_tos;
ip->ip_p = oip->ip_p;
ip->ip_len = sizeof(*ip) + sizeof(*tcp2);
return send_ip(m, ip);
}
static int send_ip(m, ip)
struct mbuf *m;
ip_t *ip;
{
# if (defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)) || \
(defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199802))
struct route ro;
# endif
# if (BSD < 199306) || defined(__sgi)
ip->ip_ttl = tcp_ttl;
# else
ip->ip_ttl = ip_defttl;
# endif
# ifdef IPSEC
m->m_pkthdr.rcvif = NULL;
# endif
# if defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)
{
int err;
bzero((char *)&ro, sizeof(ro));
err = ip_output(m, (struct mbuf *)0, &ro, 0, 0);
if (ro.ro_rt)
RTFREE(ro.ro_rt);
return err;
}
# else
/*
* extra 0 in case of multicast
*/
# if _BSDI_VERSION >= 199802
return ip_output(m, (struct mbuf *)0, &ro, 0, 0, NULL);
# else
return ip_output(m, (struct mbuf *)0, 0, 0, 0);
# endif
# endif
}
int send_icmp_err(oip, type, code, ifp, dst)
ip_t *oip;
int type, code;
void *ifp;
struct in_addr dst;
{
struct icmp *icmp;
struct mbuf *m;
ip_t *nip;
# 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;
m->m_len = sizeof(*nip) + sizeof(*icmp) + 8;
# if BSD >= 199306
m->m_data += max_linkhdr;
m->m_pkthdr.len = sizeof(*nip) + sizeof(*icmp) + 8;
m->m_pkthdr.rcvif = (struct ifnet *)0;
# endif
bzero(mtod(m, char *), (size_t)sizeof(*nip) + sizeof(*icmp) + 8);
nip = mtod(m, ip_t *);
icmp = (struct icmp *)(nip + 1);
nip->ip_v = IPVERSION;
nip->ip_hl = (sizeof(*nip) >> 2);
nip->ip_p = IPPROTO_ICMP;
nip->ip_id = oip->ip_id;
nip->ip_sum = 0;
nip->ip_ttl = 60;
nip->ip_tos = oip->ip_tos;
nip->ip_len = sizeof(*nip) + sizeof(*icmp) + 8;
if (dst.s_addr == 0) {
if (fr_ifpaddr(ifp, &dst) == -1)
return -1;
}
nip->ip_src = dst;
nip->ip_dst = oip->ip_src;
icmp->icmp_type = type;
icmp->icmp_code = code;
icmp->icmp_cksum = 0;
bcopy((char *)oip, (char *)&icmp->icmp_ip, sizeof(*oip));
bcopy((char *)oip + (oip->ip_hl << 2),
(char *)&icmp->icmp_ip + sizeof(*oip), 8); /* 64 bits */
# ifndef sparc
{
register u_short __iplen, __ipoff;
ip_t *ip = &icmp->icmp_ip;
__iplen = ip->ip_len;
__ipoff = ip->ip_off;
ip->ip_len = htons(__iplen);
ip->ip_off = htons(__ipoff);
}
# endif
icmp->icmp_cksum = ipf_cksum((u_short *)icmp, sizeof(*icmp) + 8);
return send_ip(m, nip);
}
# if !defined(IPFILTER_LKM) && (__FreeBSD_version < 300000) && !defined(__sgi)
# if (BSD < 199306)
int iplinit __P((void));
int
# else
void iplinit __P((void));
void
# endif
iplinit()
{
if (iplattach() != 0)
printf("IP Filter failed to attach\n");
ip_init();
}
# endif /* ! __NetBSD__ */
size_t mbufchainlen(m0)
register struct mbuf *m0;
{
register size_t len = 0;
for (; m0; m0 = m0->m_next)
len += m0->m_len;
return len;
}
int ipfr_fastroute(m0, fin, fdp)
struct mbuf *m0;
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;
struct sockaddr_in *dst;
struct route iproute;
struct ifnet *ifp;
frentry_t *fr;
hlen = fin->fin_hlen;
ip = mtod(m0, struct ip *);
/*
* Route packet.
*/
ro = &iproute;
bzero((caddr_t)ro, sizeof (*ro));
dst = (struct sockaddr_in *)&ro->ro_dst;
dst->sin_family = AF_INET;
fr = fin->fin_fr;
ifp = fdp->fd_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 -1;
dst->sin_addr = ip->ip_dst;
} else
dst->sin_addr = fdp->fd_ip.s_addr ? fdp->fd_ip : ip->ip_dst;
# ifdef __bsdi__
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
if (!ifp) {
if (!(fin->fin_fr->fr_flags & FR_FASTROUTE)) {
error = -2;
goto bad;
}
if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
if (in_localaddr(ip->ip_dst))
error = EHOSTUNREACH;
else
error = ENETUNREACH;
goto bad;
}
if (ro->ro_rt->rt_flags & RTF_GATEWAY)
dst = (struct sockaddr_in *)&ro->ro_rt->rt_gateway;
}
if (ro->ro_rt)
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.
*/
fin->fin_ifp = ifp;
if (fin->fin_out == 0) {
fin->fin_out = 1;
if ((fin->fin_fr = ipacct[1][fr_active]) &&
(fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) {
ATOMIC_INC(frstats[1].fr_acct);
}
fin->fin_fr = NULL;
(void) fr_checkstate(ip, fin);
(void) ip_natout(ip, fin);
} else
ip->ip_sum = 0;
/*
* If small enough for interface, can just send directly.
*/
if (ip->ip_len <= ifp->if_mtu) {
# ifndef sparc
ip->ip_id = htons(ip->ip_id);
ip->ip_len = htons(ip->ip_len);
ip->ip_off = htons(ip->ip_off);
# endif
if (!ip->ip_sum)
ip->ip_sum = in_cksum(m, hlen);
# if BSD >= 199306
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
# ifndef sparc
mhip->ip_off = htons((u_short)mhip->ip_off);
# endif
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
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)
RTFREE(ro->ro_rt);
return 0;
bad:
if (error == EMSGSIZE)
(void) send_icmp_err(ip, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG,
ifp, ip->ip_dst);
m_freem(m);
goto done;
}
#else /* #ifdef _KERNEL */
# ifdef __sgi
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__
# ifdef __sgi
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, "/tmp/%s", ifp->if_xname);
# else
sprintf(fname, "/tmp/%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;
}
struct ifnet *get_unit(name)
char *name;
{
struct ifnet *ifp, **ifa;
# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
(defined(OpenBSD) && (OpenBSD >= 199603))
for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
if (!strcmp(name, ifp->if_xname))
return ifp;
}
# else
char ifname[32], *s;
for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
(void) sprintf(ifname, "%s%d", ifp->if_name, ifp->if_unit);
if (!strcmp(name, ifname))
return ifp;
}
# endif
if (!ifneta) {
ifneta = (struct ifnet **)malloc(sizeof(ifp) * 2);
ifneta[1] = NULL;
ifneta[0] = (struct ifnet *)calloc(1, sizeof(*ifp));
nifs = 1;
} else {
nifs++;
ifneta = (struct ifnet **)realloc(ifneta,
(nifs + 1) * sizeof(*ifa));
ifneta[nifs] = NULL;
ifneta[nifs - 1] = (struct ifnet *)malloc(sizeof(*ifp));
}
ifp = ifneta[nifs - 1];
# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
(defined(OpenBSD) && (OpenBSD >= 199603))
strncpy(ifp->if_xname, name, sizeof(ifp->if_xname));
# else
for (s = name; *s && !isdigit(*s); s++)
;
if (*s && isdigit(*s)) {
ifp->if_unit = atoi(s);
ifp->if_name = (char *)malloc(s - name + 1);
strncpy(ifp->if_name, name, s - name);
ifp->if_name[s - name] = '\0';
} else {
ifp->if_name = strdup(name);
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 ipfr_fastroute(ip, fin, fdp)
ip_t *ip;
fr_info_t *fin;
frdest_t *fdp;
{
struct ifnet *ifp = fdp->fd_ifp;
if (!ifp)
return 0; /* no routing table out here */
ip->ip_len = htons((u_short)ip->ip_len);
ip->ip_off = htons((u_short)(ip->ip_off | IP_MF));
ip->ip_sum = 0;
#ifdef __sgi
(*ifp->if_output)(ifp, (void *)ip, NULL);
#else
(*ifp->if_output)(ifp, (void *)ip, NULL, 0);
#endif
return 0;
}
int ipllog __P((void))
{
verbose("l");
return 0;
}
int send_reset(ip, ifp)
ip_t *ip;
struct ifnet *ifp;
{
verbose("- TCP RST sent\n");
return 0;
}
int icmp_error(ip, ifp)
ip_t *ip;
struct ifnet *ifp;
{
verbose("- TCP RST sent\n");
return 0;
}
void frsync()
{
return;
}
#endif /* _KERNEL */
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