296 lines
6.6 KiB
C
296 lines
6.6 KiB
C
/*
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* Copyright (C) 1993-2001 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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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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#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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#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 <net/route.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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#include <sys/lkm.h>
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#include "ipl.h"
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#include "ip_compat.h"
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#include "ip_fil.h"
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#if !defined(__NetBSD_Version__) || __NetBSD_Version__ < 103050000
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#define vn_lock(v,f) VOP_LOCK(v)
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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 __P((void));
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#if (NetBSD >= 199706) || (defined(OpenBSD) && (OpenBSD >= 200211))
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int if_ipl_lkmentry __P((struct lkm_table *, int, int));
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#else
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#if defined(OpenBSD)
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int if_ipl __P((struct lkm_table *, int, int));
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#else
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int xxxinit __P((struct lkm_table *, int, int));
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#endif
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#endif
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static int ipl_unload __P((void));
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static int ipl_load __P((void));
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static int ipl_remove __P((void));
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static int iplaction __P((struct lkm_table *, int));
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static char *ipf_devfiles[] = { IPL_NAME, IPL_NAT, IPL_STATE, IPL_AUTH,
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NULL };
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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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# if defined(__NetBSD__) && (__NetBSD_Version__ >= 106080000)
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extern const struct cdevsw ipl_cdevsw;
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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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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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# endif
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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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#ifndef OpenBSD
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(void *)nullop, /* reset */
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#endif
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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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#if defined(__NetBSD__) && (__NetBSD_Version__ >= 106080000)
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MOD_DEV(IPL_VERSION, "ipl", NULL, -1, &ipl_cdevsw, -1);
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#else
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MOD_DEV(IPL_VERSION, LM_DT_CHAR, -1, &ipldevsw);
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#endif
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extern int vd_unuseddev __P((void));
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extern struct cdevsw cdevsw[];
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extern int nchrdev;
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#if (NetBSD >= 199706) || (defined(OpenBSD) && (OpenBSD >= 200211))
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int if_ipl_lkmentry(lkmtp, cmd, ver)
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#else
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#if defined(OpenBSD)
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int if_ipl(lkmtp, cmd, ver)
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#else
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int xxxinit(lkmtp, cmd, ver)
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#endif
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#endif
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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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#ifdef OpenBSD
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int lkmexists __P((struct lkm_table *)); /* defined in /sys/kern/kern_lkm.c */
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#endif
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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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struct lkm_dev *args = lkmtp->private.lkm_dev;
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int err = 0;
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#if !defined(__NetBSD__) || (__NetBSD_Version__ < 106080000)
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int i;
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#endif
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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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#if !defined(__NetBSD__) || (__NetBSD_Version__ < 106080000)
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for (i = 0; i < nchrdev; i++)
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if (cdevsw[i].d_open == (dev_type_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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printf("IP Filter: No free cdevsw slots\n");
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return ENODEV;
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}
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ipl_major = i;
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args->lkm_offset = i; /* slot in cdevsw[] */
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#else
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err = devsw_attach(args->lkm_devname,
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args->lkm_bdev, &args->lkm_bdevmaj,
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args->lkm_cdev, &args->lkm_cdevmaj);
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if (err != 0)
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return (err);
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ipl_major = args->lkm_cdevmaj;
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#endif
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printf("IP Filter: loaded into slot %d\n", ipl_major);
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return ipl_load();
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case LKM_E_UNLOAD :
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#if defined(__NetBSD__) && (__NetBSD_Version__ >= 106080000)
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devsw_detach(args->lkm_bdev, args->lkm_cdev);
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args->lkm_bdevmaj = -1;
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args->lkm_cdevmaj = -1;
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#endif
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err = ipl_unload();
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if (!err)
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printf("IP Filter: unloaded from slot %d\n",
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ipl_major);
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break;
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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 err;
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}
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static int ipl_remove()
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{
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char *name;
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struct nameidata nd;
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int error, i;
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for (i = 0; (name = ipf_devfiles[i]); i++) {
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NDINIT(&nd, DELETE, LOCKPARENT, UIO_SYSSPACE, 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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#ifdef OpenBSD
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VOP_LOCK(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY, curproc);
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#else
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# if !defined(__NetBSD_Version__) || (__NetBSD_Version__ < 106000000)
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vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
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# endif
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#endif
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VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
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(void) VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
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}
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return 0;
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}
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static int ipl_unload()
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{
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int error = 0;
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/*
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* Unloading - remove the filter rule check from the IP
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* input/output stream.
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*/
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#if defined(__NetBSD__)
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error = ipl_disable();
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#else
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error = ipldetach();
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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 = 0, fmode = S_IFCHR|0600, i;
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char *name;
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/*
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* XXX Remove existing device nodes prior to creating new ones
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* XXX using the assigned LKM device slot's major number. In a
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* XXX perfect world we could use the ones specified by cdevsw[].
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*/
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(void)ipl_remove();
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error = ipl_enable();
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if (error)
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return error;
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for (i = 0; (name = ipf_devfiles[i]); i++) {
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NDINIT(&nd, CREATE, LOCKPARENT, UIO_SYSSPACE, 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) | i;
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VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
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error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
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if (error)
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return error;
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}
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return error;
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}
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