Approved by: glebius (mentor) BSD Licensed by: Darren Reed <darrenr@reed.wattle.id.au> (author)
365 lines
7.0 KiB
C
365 lines
7.0 KiB
C
/* $FreeBSD$ */
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/*
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* Copyright (C) 2012 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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#include <sys/param.h>
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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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#define vn_lock(v,f) VOP_LOCK(v)
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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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extern int lkmenodev __P((void));
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#if OpenBSD >= 200311
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int if_ipf_lkmentry __P((struct lkm_table *, int, int));
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#else
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int if_ipf __P((struct lkm_table *, int, int));
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#endif
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static int ipf_unload __P((void));
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static int ipf_load __P((void));
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static int ipf_remove __P((void));
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static int ipfaction __P((struct lkm_table *, int));
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static char *ipf_devfiles[] = { IPL_NAME, IPNAT_NAME, IPSTATE_NAME,
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IPAUTH_NAME, IPSYNC_NAME, IPSCAN_NAME,
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IPLOOKUP_NAME, NULL };
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struct cdevsw ipfdevsw =
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{
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ipfopen, /* open */
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ipfclose, /* close */
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ipfread, /* read */
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(void *)nullop, /* write */
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ipfioctl, /* ioctl */
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(void *)nullop, /* stop */
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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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int ipf_major = 0;
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MOD_DEV(IPL_VERSION, LM_DT_CHAR, -1, &ipfdevsw);
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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 OpenBSD >= 200311
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int if_ipf_lkmentry (lkmtp, cmd, ver)
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#else
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int if_ipf(lkmtp, cmd, ver)
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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, ipfaction, ipfaction, ipfaction);
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}
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int lkmexists __P((struct lkm_table *)); /* defined in /sys/kern/kern_lkm.c */
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static int ipfaction(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 == (dev_type_open((*)))lkmenodev ||
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cdevsw[i].d_open == ipfopen)
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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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ipf_major = i;
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args->lkm_offset = i; /* slot in cdevsw[] */
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printf("IP Filter: loaded into slot %d\n", ipf_major);
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return ipf_load();
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case LKM_E_UNLOAD :
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err = ipf_unload();
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if (!err)
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printf("IP Filter: unloaded from slot %d\n",
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ipf_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 ipf_remove()
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{
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struct nameidata nd;
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int error, i;
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char *name;
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for (i = 0; (name = ipf_devfiles[i]); i++) {
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#if OpenBSD >= 200311
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NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_SYSSPACE,
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name, curproc);
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#else
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NDINIT(&nd, DELETE, LOCKPARENT, UIO_SYSSPACE, name, curproc);
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#endif
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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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#if OpenBSD < 200311
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VOP_LOCK(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY, curproc);
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VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
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#else
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(void)uvm_vnp_uncache(nd.ni_vp);
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VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
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VOP_LEASE(nd.ni_vp, curproc, curproc->p_ucred, LEASE_WRITE);
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#endif
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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 ipf_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 (ipf_refcnt)
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error = EBUSY;
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else if (ipf_running >= 0)
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error = ipfdetach();
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if (error == 0) {
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ipf_running = -2;
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error = ipf_remove();
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printf("%s unloaded\n", ipfilter_version);
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}
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return error;
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}
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static int ipf_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)ipf_remove();
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error = ipfattach();
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for (i = 0; (error == 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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break;
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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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error = EEXIST;
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break;
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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 = (ipf_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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}
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if (error == 0) {
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char *defpass;
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if (FR_ISPASS(ipf_pass))
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defpass = "pass";
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else if (FR_ISBLOCK(ipf_pass))
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defpass = "block";
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else
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defpass = "no-match -> block";
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printf("%s initialized. Default = %s all, Logging = %s%s\n",
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ipfilter_version, 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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#ifdef IPFILTER_COMPILED
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" (COMPILED)"
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#else
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""
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#endif
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);
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ipf_running = 1;
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}
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return error;
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}
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/*
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* routines below for saving IP headers to buffer
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*/
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int
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ipfopen(dev, flags, devtype, p)
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dev_t dev;
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int flags;
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int devtype;
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struct proc *p;
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{
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u_int min = GET_MINOR(dev);
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int error;
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if (IPL_LOGMAX < min) {
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error = ENXIO;
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} else {
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switch (unit)
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{
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case IPL_LOGIPF :
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case IPL_LOGNAT :
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case IPL_LOGSTATE :
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case IPL_LOGAUTH :
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case IPL_LOGLOOKUP :
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case IPL_LOGSYNC :
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#ifdef IPFILTER_SCAN
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case IPL_LOGSCAN :
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#endif
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error = 0;
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break;
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default :
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error = ENXIO;
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break;
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}
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}
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return error;
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}
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int
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ipfclose(dev, flags, devtype, p)
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dev_t dev;
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int flags;
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int devtype;
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struct proc *p;
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{
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u_int min = GET_MINOR(dev);
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if (IPL_LOGMAX < min)
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min = ENXIO;
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else
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min = 0;
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return min;
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}
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/*
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* ipfread/ipflog
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* both of these must operate with at least splnet() lest they be
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* called during packet processing and cause an inconsistancy to appear in
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* the filter lists.
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*/
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int
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ipfread(dev, uio, ioflag)
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dev_t dev;
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register struct uio *uio;
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int ioflag;
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{
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if (ipf_running < 1)
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return EIO;
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if (GET_MINOR(dev) == IPL_LOGSYNC)
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return ipfsync_read(uio);
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#ifdef IPFILTER_LOG
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return ipflog_read(GET_MINOR(dev), uio);
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#else
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return ENXIO;
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#endif
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}
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/*
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* ipfwrite
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* both of these must operate with at least splnet() lest they be
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* called during packet processing and cause an inconsistancy to appear in
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* the filter lists.
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*/
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int
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#if (BSD >= 199306)
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ipfwrite(dev, uio, ioflag)
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int ioflag;
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#else
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ipfwrite(dev, uio)
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#endif
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dev_t dev;
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register struct uio *uio;
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{
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if (ipf_running < 1)
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return EIO;
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if (GET_MINOR(dev) == IPL_LOGSYNC)
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return ipfsync_write(uio);
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return ENXIO;
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}
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