initial import of darren reed's ip-filter, version 3.1.2.
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mrg
parent
4810e839ab
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85f84f08cd
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# $NetBSD: Makefile,v 1.1 1997/01/05 13:26:10 mrg Exp $
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.include "../Makefile.inc"
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.PATH: $S/netinet
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KMOD= if_ipl
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SRCS= ip_fil.c fil.c mln_ipl.c ip_nat.c ip_frag.c ip_state.c
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NOMAN= yes
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CFLAGS+= -DIPFILTER -DIPFILTER_LKM -DIPFILTER_LOG
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CLEANFILES+= if_ipl
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.include <bsd.kmod.mk>
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/*
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* (C)opyright 1993-1996 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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* @(#)ipl.h 1.21 6/5/96
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*/
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#ifndef __IPL_H_
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#define __IPL_H__
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#define IPL_VERSION "IP Filter v3.1.2 - 4/12/96"
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#endif
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/*
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* (C)opyright 1993,1994,1995 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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/*
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* 29/12/94 Added code from Marc Huber <huber@fzi.de> to allow it to allocate
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* its own major char number! Way cool patch!
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*/
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#include <sys/param.h>
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/*
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* Post NetBSD 1.2 has the PFIL interface for packet filters. This turns
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* on those hooks. We don't need any special mods with this!
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*/
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#if (defined(NetBSD) && (NetBSD > 199609) && (NetBSD <= 1991011)) || \
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(defined(NetBSD1_2) && NetBSD1_2 > 1)
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# define NETBSD_PF
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#endif
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#if defined(__FreeBSD__) && (__FreeBSD__ > 1)
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# include <osreldate.h>
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#endif
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/proc.h>
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#include <sys/uio.h>
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#include <sys/kernel.h>
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#include <sys/vnode.h>
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#include <sys/namei.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/exec.h>
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#include <sys/mbuf.h>
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#if defined(__NetBSD__) || (defined(__FreeBSD_version) && \
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(__FreeBSD_version >= 199607))
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#include <net/if.h>
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#include <netinet/in_systm.h>
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#include <netinet/in.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/tcpip.h>
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#endif
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#ifndef __NetBSD__
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#include <sys/sysent.h>
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#endif
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#include <sys/lkm.h>
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#include "ipl.h"
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#include <netinet/ip_fil.h>
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#ifndef IPL_NAME
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#define IPL_NAME "/dev/ipl"
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#endif
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#if !defined(VOP_LEASE) && defined(LEASE_CHECK)
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#define VOP_LEASE LEASE_CHECK
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#endif
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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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extern int lkmenodev(), lkmexists(), lkmdispatch();
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extern int iplattach(), iplopen(), iplclose(), iplioctl(), ipldetach();
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#ifdef NETBSD_PF
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#include <net/pfil.h>
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#endif
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#ifdef IPFILTER_LOG
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extern int iplread();
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#else
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#ifdef NETBSD_PF
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#define iplread enodev
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#else
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#define iplread nodev
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#endif
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#endif
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extern int iplidentify();
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#ifdef NETBSD_PF
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int (*fr_checkp) __P((struct ip *, int, struct ifnet *, int, struct mbuf **)) = NULL;
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#endif
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static int ipl_unload(), ipl_load();
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#if (defined(NetBSD1_0) && (NetBSD1_0 > 1)) || \
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(defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199511))
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struct cdevsw ipldevsw =
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{
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iplopen, /* open */
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iplclose, /* close */
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(void*)iplread, /* read */
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0, /* write */
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iplioctl, /* ioctl */
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0, /* stop */
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0, /* tty */
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0, /* select */
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0, /* mmap */
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NULL /* strategy */
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};
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#else
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struct cdevsw ipldevsw =
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{
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iplopen, /* open */
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iplclose, /* close */
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iplread, /* read */
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(void *)nullop, /* write */
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iplioctl, /* ioctl */
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(void *)nullop, /* stop */
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(void *)nullop, /* reset */
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(void *)NULL, /* tty */
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(void *)nullop, /* select */
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(void *)nullop, /* mmap */
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NULL /* strategy */
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};
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#endif
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int ipl_major = 0;
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MOD_DEV(IPL_VERSION, LM_DT_CHAR, -1, &ipldevsw);
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extern int vd_unuseddev();
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extern struct cdevsw cdevsw[];
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extern int nchrdev;
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static int iplaction(lkmtp, cmd)
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struct lkm_table *lkmtp;
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int cmd;
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{
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int i;
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struct lkm_dev *args = lkmtp->private.lkm_dev;
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int err = 0;
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switch (cmd)
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{
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case LKM_E_LOAD :
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if (lkmexists(lkmtp))
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return EEXIST;
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for (i = 0; i < nchrdev; i++)
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if (cdevsw[i].d_open == lkmenodev ||
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cdevsw[i].d_open == iplopen)
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break;
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if (i == nchrdev)
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return ENODEV;
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ipl_major = i;
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if (cdevsw[i].d_open != iplopen) {
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bcopy(&cdevsw[i], &args->lkm_olddev.cdev,
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sizeof(struct cdevsw));
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bcopy(args->lkm_dev.cdev, &cdevsw[i],
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sizeof(struct cdevsw));
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}
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args->lkm_offset = i; /* slot in cdevsw[] */
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return ipl_load();
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case LKM_E_UNLOAD :
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i = args->lkm_offset;
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bcopy(&args->lkm_olddev.cdev, &cdevsw[i],
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sizeof(struct cdevsw));
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return ipl_unload();
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case LKM_E_STAT :
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break;
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default:
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err = EIO;
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break;
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}
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return 0;
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}
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static int ipl_remove()
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{
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struct nameidata nd;
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int error;
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NDINIT(&nd, DELETE, LOCKPARENT, UIO_SYSSPACE, IPL_NAME, curproc);
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if ((error = namei(&nd)))
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return (error);
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VOP_LEASE(nd.ni_vp, curproc, curproc->p_ucred, LEASE_WRITE);
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VOP_LOCK(nd.ni_vp);
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VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
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return VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
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}
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static int ipl_unload()
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{
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int error;
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error = ipldetach();
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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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if (!error)
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error = ipl_remove();
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return error;
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}
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static int ipl_load()
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{
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struct nameidata nd;
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struct vattr vattr;
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int error, fmode = S_IFCHR|0600;
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error = iplattach();
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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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if (error)
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return error;
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(void) ipl_remove();
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error = 0;
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NDINIT(&nd, CREATE, LOCKPARENT, UIO_SYSSPACE, IPL_NAME, curproc);
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if (error = namei(&nd))
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return error;
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if (nd.ni_vp != NULL) {
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VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
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if (nd.ni_dvp == nd.ni_vp)
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vrele(nd.ni_dvp);
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else
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vput(nd.ni_dvp);
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vrele(nd.ni_vp);
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return (EEXIST);
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}
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VATTR_NULL(&vattr);
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vattr.va_type = VCHR;
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vattr.va_mode = (fmode & 07777);
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vattr.va_rdev = ipl_major<<8;
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VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
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return VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
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}
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int xxxinit(lkmtp, cmd, ver)
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struct lkm_table *lkmtp;
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int cmd, ver;
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{
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DISPATCH(lkmtp, cmd, ver, iplaction, iplaction, iplaction);
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}
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