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freebsd-skq/sys/netinet/mlf_ipl.c
Mike Smith 7be2d30077 In the words of the submitter: 
---------
Make callers of namei() responsible for releasing references or locks
instead of having the underlying filesystems do it.  This eliminates
redundancy in all terminal filesystems and makes it possible for stacked
transport layers such as umapfs or nullfs to operate correctly.

Quality testing was done with testvn, and lat_fs from the lmbench suite.

Some NFS client testing courtesy of Patrik Kudo.

vop_mknod and vop_symlink still release the returned vpp.  vop_rename
still releases 4 vnode arguments before it returns.  These remaining cases
will be corrected in the next set of patches.
---------

Submitted by:	Michael Hancock <michaelh@cet.co.jp>
1998-05-07 04:58:58 +00:00

391 lines
9.2 KiB
C
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/*
* Copyright (C) 1993-1997 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*/
/*
* 29/12/94 Added code from Marc Huber <huber@fzi.de> to allow it to allocate
* its own major char number! Way cool patch!
*/
#include <sys/param.h>
#if defined(__FreeBSD__) && (__FreeBSD__ > 1)
# ifdef IPFILTER_LKM
# include <osreldate.h>
# define ACTUALLY_LKM_NOT_KERNEL
# else
# define __FreeBSD_version 300000 /* this will do as a hack */
# endif
#endif
#include <sys/systm.h>
#if defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)
# include "opt_devfs.h"
# include <sys/conf.h>
# include <sys/kernel.h>
# ifdef DEVFS
# include <sys/devfsext.h>
# endif /*DEVFS*/
#endif
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/lock.h>
#include <sys/stat.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/exec.h>
#include <sys/mbuf.h>
#if BSD >= 199506
# include <sys/sysctl.h>
#endif
#if (__FreeBSD_version >= 199511)
#include <net/if.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <net/route.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcpip.h>
#endif
#if (__FreeBSD__ > 1)
# include <sys/sysent.h>
#endif
#include <sys/lkm.h>
#include "netinet/ipl.h"
#include "netinet/ip_compat.h"
#include "netinet/ip_fil.h"
#include "netinet/ip_state.h"
#include "netinet/ip_nat.h"
#include "netinet/ip_auth.h"
#include "netinet/ip_frag.h"
#if !defined(VOP_LEASE) && defined(LEASE_CHECK)
#define VOP_LEASE LEASE_CHECK
#endif
#ifndef MIN
#define MIN(a,b) (((a)<(b))?(a):(b))
#endif
extern int lkmenodev __P((void));
static char *ipf_devfiles[] = { IPL_NAME, IPL_NAT, IPL_STATE, IPL_AUTH,
NULL };
static int if_ipl_unload __P((struct lkm_table *, int));
static int if_ipl_load __P((struct lkm_table *, int));
static int if_ipl_remove __P((void));
int xxxinit __P((struct lkm_table *, int, int));
struct cdevsw ipldevsw =
{
iplopen, /* open */
iplclose, /* close */
iplread, /* read */
(void *)nullop, /* write */
iplioctl, /* ioctl */
(void *)nullop, /* stop */
(void *)nullop, /* reset */
(void *)NULL, /* tty */
(void *)nullop, /* select */
(void *)nullop, /* mmap */
NULL /* strategy */
};
#ifdef SYSCTL_INT
SYSCTL_NODE(_net_inet, OID_AUTO, ipf, CTLFLAG_RW, 0, "IPF");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_flags, CTLFLAG_RW, &fr_flags, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_pass, CTLFLAG_RW, &fr_pass, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_active, CTLFLAG_RD, &fr_active, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_tcpidletimeout, CTLFLAG_RW,
&fr_tcpidletimeout, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_tcpclosewait, CTLFLAG_RW,
&fr_tcpclosewait, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_tcplastack, CTLFLAG_RW,
&fr_tcplastack, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_tcptimeout, CTLFLAG_RW,
&fr_tcptimeout, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_tcpclosed, CTLFLAG_RW,
&fr_tcpclosed, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_udptimeout, CTLFLAG_RW,
&fr_udptimeout, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_icmptimeout, CTLFLAG_RW,
&fr_icmptimeout, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_defnatage, CTLFLAG_RW,
&fr_defnatage, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_ipfrttl, CTLFLAG_RW,
&fr_ipfrttl, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, ipl_unreach, CTLFLAG_RW,
&ipl_unreach, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, ipl_inited, CTLFLAG_RD,
&ipl_inited, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_authsize, CTLFLAG_RD,
&fr_authsize, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_authused, CTLFLAG_RD,
&fr_authused, 0, "");
SYSCTL_INT(_net_inet_ipf, OID_AUTO, fr_defaultauthage, CTLFLAG_RW,
&fr_defaultauthage, 0, "");
#endif
#ifdef DEVFS
void *ipf_devfs[IPL_LOGMAX + 1];
#endif
#if !defined(__FreeBSD_version) || (__FreeBSD_version < 220000)
int ipl_major = 0;
MOD_DEV(IPL_VERSION, LM_DT_CHAR, -1, &ipldevsw);
extern struct cdevsw cdevsw[];
extern int vd_unuseddev __P((void));
extern int nchrdev;
#else
int ipl_major = CDEV_MAJOR;
static struct cdevsw ipl_cdevsw = {
iplopen, iplclose, iplread, nowrite, /* 79 */
iplioctl, nostop, noreset, nodevtotty,
seltrue, nommap, nostrategy, "ipl",
NULL, -1
};
#endif
static void ipl_drvinit __P((void *));
#ifdef ACTUALLY_LKM_NOT_KERNEL
static int iplaction __P((struct lkm_table *, int));
static int iplaction(lkmtp, cmd)
struct lkm_table *lkmtp;
int cmd;
{
#if !defined(__FreeBSD_version) || (__FreeBSD_version < 220000)
int i = ipl_major;
struct lkm_dev *args = lkmtp->private.lkm_dev;
#endif
int err = 0;
switch (cmd)
{
case LKM_E_LOAD :
if (lkmexists(lkmtp))
return EEXIST;
#if !defined(__FreeBSD_version) || (__FreeBSD_version < 220000)
for (i = 0; i < nchrdev; i++)
if (cdevsw[i].d_open == lkmenodev ||
cdevsw[i].d_open == iplopen)
break;
if (i == nchrdev) {
printf("IP Filter: No free cdevsw slots\n");
return ENODEV;
}
ipl_major = i;
args->lkm_offset = i; /* slot in cdevsw[] */
#endif
printf("IP Filter: loaded into slot %d\n", ipl_major);
err = if_ipl_load(lkmtp, cmd);
if (!err)
ipl_drvinit((void *)NULL);
return err;
break;
case LKM_E_UNLOAD :
err = if_ipl_unload(lkmtp, cmd);
if (!err) {
printf("IP Filter: unloaded from slot %d\n",
ipl_major);
# ifdef DEVFS
if (ipf_devfs[IPL_LOGIPF])
devfs_remove_dev(ipf_devfs[IPL_LOGIPF]);
if (ipf_devfs[IPL_LOGNAT])
devfs_remove_dev(ipf_devfs[IPL_LOGNAT]);
if (ipf_devfs[IPL_LOGSTATE])
devfs_remove_dev(ipf_devfs[IPL_LOGSTATE]);
if (ipf_devfs[IPL_LOGAUTH])
devfs_remove_dev(ipf_devfs[IPL_LOGAUTH]);
# endif
}
return err;
case LKM_E_STAT :
break;
default:
err = EIO;
break;
}
return 0;
}
static int if_ipl_remove __P((void))
{
char *name;
struct nameidata nd;
int error, i;
for (i = 0; (name = ipf_devfiles[i]); i++) {
NDINIT(&nd, DELETE, LOCKPARENT, UIO_SYSSPACE, name, curproc);
if ((error = namei(&nd)))
return (error);
VOP_LEASE(nd.ni_vp, curproc, curproc->p_ucred, LEASE_WRITE);
vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY, curproc);
VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
(void) VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
if (nd.ni_vp != NULLVP)
vput(nd.ni_vp);
}
return 0;
}
static int if_ipl_unload(lkmtp, cmd)
struct lkm_table *lkmtp;
int cmd;
{
int error = 0;
error = ipldetach();
if (!error)
error = if_ipl_remove();
return error;
}
static int if_ipl_load(lkmtp, cmd)
struct lkm_table *lkmtp;
int cmd;
{
struct nameidata nd;
struct vattr vattr;
int error = 0, fmode = S_IFCHR|0600, i;
char *name;
error = iplattach();
if (error)
return error;
(void) if_ipl_remove();
for (i = 0; (name = ipf_devfiles[i]); i++) {
NDINIT(&nd, CREATE, LOCKPARENT, UIO_SYSSPACE, name, curproc);
if ((error = namei(&nd)))
return error;
if (nd.ni_vp != NULL) {
VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
if (nd.ni_dvp == nd.ni_vp)
vrele(nd.ni_dvp);
else
vput(nd.ni_dvp);
vrele(nd.ni_vp);
return (EEXIST);
}
VATTR_NULL(&vattr);
vattr.va_type = VCHR;
vattr.va_mode = (fmode & 07777);
vattr.va_rdev = (ipl_major << 8) | i;
VOP_LEASE(nd.ni_dvp, curproc, curproc->p_ucred, LEASE_WRITE);
error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
vput(nd.ni_dvp);
if (error)
return error;
}
return 0;
}
#endif /* actually LKM */
#if defined(__FreeBSD_version) && (__FreeBSD_version < 220000)
/*
* strlen isn't present in 2.1.* kernels.
*/
size_t strlen(string)
char *string;
{
register char *s;
for (s = string; *s; s++)
;
return (size_t)(s - string);
}
int xxxinit(lkmtp, cmd, ver)
struct lkm_table *lkmtp;
int cmd, ver;
{
DISPATCH(lkmtp, cmd, ver, iplaction, iplaction, iplaction);
}
#else
# ifdef IPFILTER_LKM
# include <sys/exec.h>
MOD_DECL(if_ipl);
static struct lkm_dev _module = {
LM_DEV,
LKM_VERSION,
IPL_VERSION,
CDEV_MAJOR,
LM_DT_CHAR,
{ (void *)&ipl_cdevsw }
};
int if_ipl __P((struct lkm_table *, int, int));
int if_ipl(lkmtp, cmd, ver)
struct lkm_table *lkmtp;
int cmd, ver;
{
DISPATCH(lkmtp, cmd, ver, iplaction, iplaction, iplaction);
}
# endif
static ipl_devsw_installed = 0;
static void ipl_drvinit __P((void *unused))
{
dev_t dev;
# ifdef DEVFS
void **tp = ipf_devfs;
# endif
if (!ipl_devsw_installed ) {
dev = makedev(CDEV_MAJOR, 0);
cdevsw_add(&dev, &ipl_cdevsw, NULL);
ipl_devsw_installed = 1;
# ifdef DEVFS
tp[IPL_LOGIPF] = devfs_add_devswf(&ipl_cdevsw, IPL_LOGIPF,
DV_CHR, 0, 0, 0600, "ipf");
tp[IPL_LOGNAT] = devfs_add_devswf(&ipl_cdevsw, IPL_LOGNAT,
DV_CHR, 0, 0, 0600, "ipnat");
tp[IPL_LOGSTATE] = devfs_add_devswf(&ipl_cdevsw, IPL_LOGSTATE,
DV_CHR, 0, 0, 0600,
"ipstate");
tp[IPL_LOGAUTH] = devfs_add_devswf(&ipl_cdevsw, IPL_LOGAUTH,
DV_CHR, 0, 0, 0600,
"ipauth");
# endif
}
}
SYSINIT(ipldev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ipl_drvinit,NULL);
#endif /* _FreeBSD_version */
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