1328 lines
28 KiB
C
1328 lines
28 KiB
C
/* $NetBSD: ip_fil.c,v 1.31 1998/11/22 15:17:19 mrg Exp $ */
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/*
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* Copyright (C) 1993-1998 by Darren Reed.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and due credit is given
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* to the original author and the contributors.
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*/
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#if !defined(lint)
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static const char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-1995 Darren Reed";
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static const char rcsid[] = "@(#)Id: ip_fil.c,v 2.0.2.44.2.10 1998/11/22 01:50:22 darrenr Exp ";
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#endif
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#ifndef SOLARIS
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#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
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#endif
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#if defined(KERNEL) && !defined(_KERNEL)
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# define _KERNEL
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#endif
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#ifdef __FreeBSD__
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# if defined(_KERNEL) && !defined(IPFILTER_LKM)
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# include <sys/osreldate.h>
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# else
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# include <osreldate.h>
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# endif
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#endif
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#ifndef _KERNEL
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# include <stdio.h>
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# include <string.h>
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# include <stdlib.h>
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# include <ctype.h>
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#endif
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#include <sys/errno.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/file.h>
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#if __FreeBSD_version >= 220000 && defined(_KERNEL)
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# include <sys/fcntl.h>
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# include <sys/filio.h>
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#else
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# include <sys/ioctl.h>
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#endif
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#include <sys/time.h>
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#ifdef _KERNEL
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# include <sys/systm.h>
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#endif
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#include <sys/uio.h>
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#if !SOLARIS
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# if (NetBSD > 199609) || (OpenBSD > 199603)
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# include <sys/dirent.h>
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# else
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# include <sys/dir.h>
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# endif
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# include <sys/mbuf.h>
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#else
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# include <sys/filio.h>
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#endif
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#ifdef sun
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# include <net/af.h>
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#endif
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#if __FreeBSD_version >= 300000
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# include <net/if_var.h>
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#endif
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#ifdef __sgi
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#include <sys/debug.h>
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# ifdef IFF_DRVRLOCK /* IRIX6 */
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#include <sys/hashing.h>
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# endif
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#endif
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#include <net/route.h>
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#include <netinet/in.h>
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#if !(defined(__sgi) && !defined(IFF_DRVRLOCK)) /* IRIX < 6 */
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#include <netinet/in_var.h>
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#endif
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <netinet/tcpip.h>
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#include <netinet/ip_icmp.h>
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#ifndef _KERNEL
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# include <syslog.h>
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#endif
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#include "netinet/ip_compat.h"
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#include "netinet/ip_fil.h"
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#include "netinet/ip_proxy.h"
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#include "netinet/ip_nat.h"
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#include "netinet/ip_frag.h"
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#include "netinet/ip_state.h"
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#include "netinet/ip_auth.h"
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#ifndef MIN
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#define MIN(a,b) (((a)<(b))?(a):(b))
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#endif
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#if !SOLARIS && defined(_KERNEL)
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extern int ip_optcopy __P((struct ip *, struct ip *));
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#endif
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extern struct protosw inetsw[];
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#ifndef _KERNEL
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# include "ipt.h"
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static struct ifnet **ifneta = NULL;
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static int nifs = 0;
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#else
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# if (BSD < 199306) && !defined(__sgi)
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static int (*fr_saveslowtimo) __P((void));
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# else
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static void (*fr_saveslowtimo) __P((void));
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# endif
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# if (BSD < 199306) || defined(__sgi)
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extern int tcp_ttl;
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# endif
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#endif
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int ipl_inited = 0;
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int ipl_unreach = ICMP_UNREACH_FILTER;
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u_long ipl_frouteok[2] = {0, 0};
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static void fixskip __P((frentry_t **, frentry_t *, int));
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static void frzerostats __P((caddr_t));
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static void frsync __P((void));
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#if defined(__NetBSD__) || defined(__OpenBSD__)
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static int frrequest __P((int, u_long, caddr_t, int));
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#else
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static int frrequest __P((int, int, caddr_t, int));
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#endif
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#ifdef _KERNEL
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static int (*fr_savep) __P((ip_t *, int, void *, int, struct mbuf **));
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# ifdef __sgi
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extern kmutex_t ipf_rw;
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# endif
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#else
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int ipllog __P((void));
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void init_ifp __P((void));
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# ifdef __sgi
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static int no_output __P((struct ifnet *, struct mbuf *,
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struct sockaddr *));
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static int write_output __P((struct ifnet *, struct mbuf *,
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struct sockaddr *));
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# else
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static int no_output __P((struct ifnet *, struct mbuf *,
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struct sockaddr *, struct rtentry *));
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static int write_output __P((struct ifnet *, struct mbuf *,
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struct sockaddr *, struct rtentry *));
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# endif
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#endif
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#if (_BSDI_VERSION >= 199510) && defined(_KERNEL)
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# include <sys/device.h>
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# include <sys/conf.h>
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struct cfdriver iplcd = {
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NULL, "ipl", NULL, NULL, DV_DULL, 0
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};
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struct devsw iplsw = {
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&iplcd,
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iplopen, iplclose, iplread, nowrite, iplioctl, noselect, nommap,
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nostrat, nodump, nopsize, 0,
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nostop
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};
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#endif /* _BSDI_VERSION >= 199510 && _KERNEL */
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#if defined(__NetBSD__) || defined(__OpenBSD__) || (_BSDI_VERSION >= 199701)
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# include <sys/conf.h>
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# if defined(NETBSD_PF)
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# include <net/pfil.h>
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/*
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* We provide the fr_checkp name just to minimize changes later.
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*/
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int (*fr_checkp) __P((ip_t *ip, int hlen, void *ifp, int out, mb_t **mp));
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# endif /* NETBSD_PF */
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#endif /* __NetBSD__ */
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#ifdef _KERNEL
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# if defined(IPFILTER_LKM) && !defined(__sgi)
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int iplidentify(s)
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char *s;
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{
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if (strcmp(s, "ipl") == 0)
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return 1;
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return 0;
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}
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# endif /* IPFILTER_LKM */
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/*
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* BSD pseudo-device attach routine; this is a no-op.
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*/
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# if defined(__NetBSD__)
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void
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ipfilterattach(count)
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int count;
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{
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/*
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* Do nothing here, really. The filter will be enabled
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* by the SIOCFRENB ioctl.
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*/
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}
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# endif
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# if defined(__NetBSD__)
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int ipl_enable()
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# else
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int iplattach()
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# endif
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{
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char *defpass;
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int s;
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# ifdef __sgi
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int error;
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# endif
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SPL_NET(s);
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if (ipl_inited || (fr_checkp == fr_check)) {
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printf("IP Filter: already initialized\n");
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SPL_X(s);
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return EBUSY;
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}
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# ifdef NETBSD_PF
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pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT);
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# endif
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# ifdef __sgi
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error = ipfilter_sgi_attach();
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if (error) {
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SPL_X(s);
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return error;
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}
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# endif
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ipl_inited = 1;
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bzero((char *)frcache, sizeof(frcache));
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bzero((char *)nat_table, sizeof(nat_table));
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fr_savep = fr_checkp;
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fr_checkp = fr_check;
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fr_saveslowtimo = inetsw[0].pr_slowtimo;
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inetsw[0].pr_slowtimo = ipfr_slowtimer;
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# ifdef IPFILTER_LOG
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ipflog_init();
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# endif
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SPL_X(s);
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if (fr_pass & FR_PASS)
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defpass = "pass";
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else if (fr_pass & FR_BLOCK)
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defpass = "block";
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else
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defpass = "no-match -> block";
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printf("IP Filter: initialized. Default = %s all, Logging = %s\n",
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defpass,
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# ifdef IPFILTER_LOG
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"enabled");
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# else
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"disabled");
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# endif
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return 0;
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}
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/*
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* Disable the filter by removing the hooks from the IP input/output
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* stream.
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*/
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# if defined(__NetBSD__)
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int ipl_disable()
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# else
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int ipldetach()
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# endif
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{
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int s, i = FR_INQUE|FR_OUTQUE;
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SPL_NET(s);
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if (!ipl_inited)
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{
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printf("IP Filter: not initialized\n");
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SPL_X(s);
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return 0;
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}
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fr_checkp = fr_savep;
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inetsw[0].pr_slowtimo = fr_saveslowtimo;
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frflush(IPL_LOGIPF, &i);
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ipl_inited = 0;
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# ifdef NETBSD_PF
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pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT);
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# endif
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# ifdef __sgi
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ipfilter_sgi_detach();
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# endif
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ipfr_unload();
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ip_natunload();
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fr_stateunload();
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fr_authunload();
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SPL_X(s);
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return 0;
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}
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#endif /* _KERNEL */
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static void frzerostats(data)
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caddr_t data;
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{
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struct friostat fio;
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bcopy((char *)frstats, (char *)fio.f_st,
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sizeof(struct filterstats) * 2);
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fio.f_fin[0] = ipfilter[0][0];
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fio.f_fin[1] = ipfilter[0][1];
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fio.f_fout[0] = ipfilter[1][0];
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fio.f_fout[1] = ipfilter[1][1];
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fio.f_acctin[0] = ipacct[0][0];
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fio.f_acctin[1] = ipacct[0][1];
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fio.f_acctout[0] = ipacct[1][0];
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fio.f_acctout[1] = ipacct[1][1];
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fio.f_active = fr_active;
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fio.f_froute[0] = ipl_frouteok[0];
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fio.f_froute[1] = ipl_frouteok[1];
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IWCOPY((caddr_t)&fio, data, sizeof(fio));
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bzero((char *)frstats, sizeof(*frstats) * 2);
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}
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/*
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* Filter ioctl interface.
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*/
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#ifdef __sgi
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int IPL_EXTERN(ioctl)(dev_t dev, int cmd, caddr_t data, int mode
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# ifdef _KERNEL
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, cred_t *cp, int *rp
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# endif
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)
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#else
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int IPL_EXTERN(ioctl)(dev, cmd, data, mode
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#if ((_BSDI_VERSION >= 199510) || (BSD >= 199506) || (NetBSD >= 199511) || \
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(__FreeBSD_version >= 220000)) && defined(_KERNEL)
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, p)
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struct proc *p;
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#else
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)
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#endif
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dev_t dev;
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#if defined(__NetBSD__) || defined(__OpenBSD__) || (_BSDI_VERSION >= 199701)
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u_long cmd;
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#else
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int cmd;
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#endif
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caddr_t data;
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int mode;
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#endif /* __sgi */
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{
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#if defined(_KERNEL) && !SOLARIS
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int s;
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#endif
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int error = 0, unit = 0, tmp;
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#ifdef _KERNEL
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unit = GET_MINOR(dev);
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if ((IPL_LOGMAX < unit) || (unit < 0))
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return ENXIO;
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#endif
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SPL_NET(s);
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if (unit == IPL_LOGNAT) {
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error = nat_ioctl(data, cmd, mode);
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SPL_X(s);
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return error;
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}
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if (unit == IPL_LOGSTATE) {
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error = fr_state_ioctl(data, cmd, mode);
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SPL_X(s);
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return error;
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}
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switch (cmd) {
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case FIONREAD :
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#ifdef IPFILTER_LOG
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IWCOPY((caddr_t)&iplused[IPL_LOGIPF], (caddr_t)data,
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sizeof(iplused[IPL_LOGIPF]));
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#endif
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break;
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#if (!defined(IPFILTER_LKM) || defined(__NetBSD__)) && defined(_KERNEL)
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case SIOCFRENB :
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{
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u_int enable;
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# if defined(__NetBSD__) && defined(_KERNEL)
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if ((securelevel >= 2) || !(mode & FWRITE))
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#else
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if (!(mode & FWRITE))
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#endif
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error = EPERM;
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else {
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IRCOPY(data, (caddr_t)&enable, sizeof(enable));
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# if defined(__NetBSD__)
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if (enable)
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error = ipl_enable();
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else
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error = ipl_disable();
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# else
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if (enable)
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error = iplattach();
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else
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error = ipldetach();
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# endif
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}
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break;
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}
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#endif
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case SIOCSETFF :
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#if defined(__NetBSD__) && defined(_KERNEL)
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if ((securelevel >= 2) || !(mode & FWRITE))
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#else
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if (!(mode & FWRITE))
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#endif
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error = EPERM;
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else
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IRCOPY(data, (caddr_t)&fr_flags, sizeof(fr_flags));
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break;
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case SIOCGETFF :
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IWCOPY((caddr_t)&fr_flags, data, sizeof(fr_flags));
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break;
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case SIOCINAFR :
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case SIOCRMAFR :
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case SIOCADAFR :
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case SIOCZRLST :
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#if defined(__NetBSD__) && defined(_KERNEL)
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if ((securelevel >= 2) || !(mode & FWRITE))
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#else
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if (!(mode & FWRITE))
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#endif
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error = EPERM;
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else
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error = frrequest(unit, cmd, data, fr_active);
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break;
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case SIOCINIFR :
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case SIOCRMIFR :
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case SIOCADIFR :
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#if defined(__NetBSD__) && defined(_KERNEL)
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if ((securelevel >= 2) || !(mode & FWRITE))
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#else
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if (!(mode & FWRITE))
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#endif
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error = EPERM;
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else
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error = frrequest(unit, cmd, data, 1 - fr_active);
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break;
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case SIOCSWAPA :
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#if defined(__NetBSD__) && defined(_KERNEL)
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if((securelevel >= 2) || !(mode & FWRITE))
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#else
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if (!(mode & FWRITE))
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#endif
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error = EPERM;
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else {
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bzero((char *)frcache, sizeof(frcache[0]) * 2);
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*(u_int *)data = fr_active;
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fr_active = 1 - fr_active;
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}
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break;
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case SIOCGETFS :
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{
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struct friostat fio;
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bcopy((char *)frstats, (char *)fio.f_st,
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sizeof(struct filterstats) * 2);
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fio.f_fin[0] = ipfilter[0][0];
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fio.f_fin[1] = ipfilter[0][1];
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fio.f_fout[0] = ipfilter[1][0];
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fio.f_fout[1] = ipfilter[1][1];
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fio.f_acctin[0] = ipacct[0][0];
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fio.f_acctin[1] = ipacct[0][1];
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fio.f_acctout[0] = ipacct[1][0];
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fio.f_acctout[1] = ipacct[1][1];
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fio.f_auth = ipauth;
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fio.f_active = fr_active;
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fio.f_froute[0] = ipl_frouteok[0];
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fio.f_froute[1] = ipl_frouteok[1];
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IWCOPY((caddr_t)&fio, data, sizeof(fio));
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break;
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}
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case SIOCFRZST :
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#if defined(__NetBSD__) && defined(_KERNEL)
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if ((securelevel >= 2) || !(mode & FWRITE))
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#else
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if (!(mode & FWRITE))
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#endif
|
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error = EPERM;
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else
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frzerostats(data);
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break;
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case SIOCIPFFL :
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#if defined(__NetBSD__) && defined(_KERNEL)
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if ((securelevel >= 2) || !(mode & FWRITE))
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#else
|
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if (!(mode & FWRITE))
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#endif
|
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error = EPERM;
|
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else {
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IRCOPY(data, (caddr_t)&tmp, sizeof(tmp));
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frflush(unit, &tmp);
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IWCOPY((caddr_t)&tmp, data, sizeof(tmp));
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}
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break;
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#ifdef IPFILTER_LOG
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case SIOCIPFFB :
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#if defined(__NetBSD__) && defined(_KERNEL)
|
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if ((securelevel >= 2) || !(mode & FWRITE))
|
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#else
|
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if (!(mode & FWRITE))
|
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#endif
|
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error = EPERM;
|
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else
|
|
*(int *)data = ipflog_clear(unit);
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break;
|
|
#endif /* IPFILTER_LOG */
|
|
case SIOCGFRST :
|
|
IWCOPY((caddr_t)ipfr_fragstats(), data, sizeof(ipfrstat_t));
|
|
break;
|
|
case SIOCAUTHW :
|
|
case SIOCAUTHR :
|
|
#if defined(__NetBSD__) && defined(_KERNEL)
|
|
if ((securelevel >= 2) || !(mode & FWRITE)) {
|
|
#else
|
|
if (!(mode & FWRITE)) {
|
|
#endif
|
|
error = EPERM;
|
|
break;
|
|
}
|
|
case SIOCATHST :
|
|
error = fr_auth_ioctl(data, cmd, NULL, NULL);
|
|
break;
|
|
case SIOCFRSYN :
|
|
#if defined(__NetBSD__) && defined(_KERNEL)
|
|
if ((securelevel >= 2) || !(mode & FWRITE))
|
|
#else
|
|
if (!(mode & FWRITE))
|
|
#endif
|
|
error = EPERM;
|
|
else {
|
|
#if defined(_KERNEL) && defined(__sgi)
|
|
ipfsync();
|
|
#endif
|
|
frsync();
|
|
}
|
|
break;
|
|
default :
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
SPL_X(s);
|
|
return error;
|
|
}
|
|
|
|
|
|
static void frsync()
|
|
{
|
|
#ifdef _KERNEL
|
|
struct ifnet *ifp;
|
|
|
|
# if defined(__OpenBSD__) || (NetBSD >= 199511)
|
|
for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next)
|
|
# else
|
|
for (ifp = ifnet; ifp; ifp = ifp->if_next)
|
|
# endif
|
|
ip_natsync(ifp);
|
|
#endif
|
|
}
|
|
|
|
|
|
static void fixskip(listp, rp, addremove)
|
|
frentry_t **listp, *rp;
|
|
int addremove;
|
|
{
|
|
frentry_t *fp;
|
|
int rules = 0, rn = 0;
|
|
|
|
for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rules++)
|
|
;
|
|
|
|
if (!fp)
|
|
return;
|
|
|
|
for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++)
|
|
if (fp->fr_skip && (rn + fp->fr_skip >= rules))
|
|
fp->fr_skip += addremove;
|
|
}
|
|
|
|
|
|
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, group;
|
|
|
|
fp = &frd;
|
|
IRCOPY(data, (caddr_t)fp, sizeof(*fp));
|
|
|
|
/*
|
|
* Check that the group number does exist and that if a head group
|
|
* has been specified, doesn't exist.
|
|
*/
|
|
if (fp->fr_grhead &&
|
|
fr_findgroup(fp->fr_grhead, fp->fr_flags, unit, set, NULL))
|
|
return EEXIST;
|
|
if (fp->fr_group &&
|
|
!fr_findgroup(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;
|
|
}
|
|
|
|
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) {
|
|
ftail = fprev;
|
|
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(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, f, ftail);
|
|
KMALLOC(f, frentry_t *, sizeof(*f));
|
|
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(_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 (2 < 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(_KERNEL)
|
|
, devtype, p)
|
|
int devtype;
|
|
struct proc *p;
|
|
# else
|
|
)
|
|
# endif
|
|
dev_t dev;
|
|
int flags;
|
|
#endif /* __sgi */
|
|
{
|
|
u_int min = GET_MINOR(dev);
|
|
|
|
if (2 < 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(ti)
|
|
struct tcpiphdr *ti;
|
|
{
|
|
struct tcpiphdr *tp;
|
|
struct tcphdr *tcp;
|
|
struct mbuf *m;
|
|
int tlen = 0, err;
|
|
ip_t *ip;
|
|
# if defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)
|
|
struct route ro;
|
|
# endif
|
|
|
|
if (ti->ti_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);
|
|
m->m_data += max_linkhdr;
|
|
# endif
|
|
if (m == NULL)
|
|
return -1;
|
|
|
|
if (ti->ti_flags & TH_SYN)
|
|
tlen = 1;
|
|
m->m_len = sizeof (struct tcpiphdr);
|
|
# if BSD >= 199306
|
|
m->m_pkthdr.len = sizeof (struct tcpiphdr);
|
|
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 *);
|
|
tcp = (struct tcphdr *)((char *)ip + sizeof(struct ip));
|
|
|
|
ip->ip_src.s_addr = ti->ti_dst.s_addr;
|
|
ip->ip_dst.s_addr = ti->ti_src.s_addr;
|
|
tcp->th_dport = ti->ti_sport;
|
|
tcp->th_sport = ti->ti_dport;
|
|
tcp->th_ack = htonl(ntohl(ti->ti_seq) + tlen);
|
|
tcp->th_off = sizeof(struct tcphdr) >> 2;
|
|
tcp->th_flags = TH_RST|TH_ACK;
|
|
tp->ti_pr = ((struct ip *)ti)->ip_p;
|
|
tp->ti_len = htons(sizeof(struct tcphdr));
|
|
tcp->th_sum = in_cksum(m, sizeof(struct tcpiphdr));
|
|
|
|
ip->ip_tos = ((struct ip *)ti)->ip_tos;
|
|
ip->ip_p = ((struct ip *)ti)->ip_p;
|
|
ip->ip_len = sizeof (struct tcpiphdr);
|
|
# if (BSD < 199306) || defined(__sgi)
|
|
ip->ip_ttl = tcp_ttl;
|
|
# else
|
|
ip->ip_ttl = ip_defttl;
|
|
# endif
|
|
|
|
# if defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)
|
|
bzero((char *)&ro, sizeof(ro));
|
|
err = ip_output(m, (struct mbuf *)0, &ro, 0, 0);
|
|
if (ro.ro_rt)
|
|
RTFREE(ro.ro_rt);
|
|
# else
|
|
/*
|
|
* extra 0 in case of multicast
|
|
*/
|
|
err = ip_output(m, (struct mbuf *)0, 0, 0, 0);
|
|
# endif
|
|
return err;
|
|
}
|
|
|
|
|
|
# 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 defined(__NetBSD__)
|
|
(void) ipl_enable();
|
|
# else
|
|
(void) iplattach();
|
|
# endif
|
|
ip_init();
|
|
}
|
|
# endif /* !IPFILTER_LKM && __FreeBSD_version < 300000 */
|
|
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
void 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;
|
|
struct ifnet *ifp = fdp->fd_ifp;
|
|
int len, off, error = 0;
|
|
int hlen = fin->fin_hlen;
|
|
struct route iproute;
|
|
struct sockaddr_in *dst;
|
|
|
|
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;
|
|
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.
|
|
*/
|
|
if (fin->fin_out == 0) {
|
|
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) ip_natout(ip, hlen, fin);
|
|
}
|
|
if (fin->fin_out)
|
|
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) {
|
|
/* Send ICMP error here */
|
|
struct mbuf *mcopy;
|
|
mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
|
|
if (mcopy)
|
|
icmp_error(mcopy, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG,
|
|
ip->ip_dst.s_addr, ifp);
|
|
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) {
|
|
MGET(m, M_DONTWAIT, MT_HEADER);
|
|
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;
|
|
}
|
|
# 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;
|
|
bad:
|
|
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
|
|
{
|
|
# if !(defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
|
|
(defined(OpenBSD) && (OpenBSD >= 199603))
|
|
ip_t *ip = (ip_t *)m;
|
|
# endif
|
|
# else
|
|
static int write_output(ifp, ip)
|
|
struct ifnet *ifp;
|
|
ip_t *ip;
|
|
{
|
|
# endif
|
|
FILE *fp;
|
|
char fname[32];
|
|
|
|
# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
|
|
(defined(OpenBSD) && (OpenBSD >= 199603))
|
|
sprintf(fname, "/tmp/%s", ifp->if_xname);
|
|
if ((fp = fopen(fname, "a"))) {
|
|
fclose(fp);
|
|
}
|
|
# else
|
|
sprintf(fname, "/tmp/%s%d", ifp->if_name, ifp->if_unit);
|
|
if ((fp = fopen(fname, "a"))) {
|
|
fwrite((char *)ip, ntohs(ip->ip_len), 1, fp);
|
|
fclose(fp);
|
|
}
|
|
# endif
|
|
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()
|
|
{
|
|
FILE *fp;
|
|
struct ifnet *ifp, **ifa;
|
|
char fname[32];
|
|
# 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);
|
|
if ((fp = fopen(fname, "w")))
|
|
fclose(fp);
|
|
}
|
|
# else
|
|
|
|
for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
|
|
ifp->if_output = write_output;
|
|
sprintf(fname, "/tmp/%s%d", ifp->if_name, ifp->if_unit);
|
|
if ((fp = fopen(fname, "w")))
|
|
fclose(fp);
|
|
}
|
|
# endif
|
|
}
|
|
|
|
|
|
void ipfr_fastroute(ip, fin, fdp)
|
|
ip_t *ip;
|
|
fr_info_t *fin;
|
|
frdest_t *fdp;
|
|
{
|
|
struct ifnet *ifp = fdp->fd_ifp;
|
|
|
|
if (!ifp)
|
|
return; /* 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
|
|
}
|
|
|
|
|
|
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;
|
|
}
|
|
#endif /* _KERNEL */
|