31519b13c8
fields of an ICMP packet. Use this to allow ipfw to pullup only these values since it does not use the rest of the packet and it was failed on ICMP packets because they were not long enough. struct icmp should probably be modified to use these at some point, but that will break a fair bit of code so it can wait for another day. On the off chance that adding this struct breaks something in ports, bump __FreeBSD_version. Reported by: Randy Bush <randy at psg dot com> Tested by: Randy Bush <randy at psg dot com>
327 lines
11 KiB
C
327 lines
11 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)param.h 8.3 (Berkeley) 4/4/95
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* $FreeBSD$
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*/
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#ifndef _SYS_PARAM_H_
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#define _SYS_PARAM_H_
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#include <sys/_null.h>
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#define BSD 199506 /* System version (year & month). */
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#define BSD4_3 1
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#define BSD4_4 1
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/*
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* __FreeBSD_version numbers are documented in the Porter's Handbook.
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* If you bump the version for any reason, you should update the documentation
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* there.
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* Currently this lives here:
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*
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* doc/en_US.ISO8859-1/books/porters-handbook/book.sgml
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*
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* scheme is: <major><two digit minor>Rxx
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* 'R' is 0 if release branch or x.0-CURRENT before RELENG_*_0
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* is created, otherwise 1.
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*/
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#undef __FreeBSD_version
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#define __FreeBSD_version 600025 /* Master, propagated to newvers */
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#ifndef LOCORE
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#include <sys/types.h>
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#endif
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/*
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* Machine-independent constants (some used in following include files).
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* Redefined constants are from POSIX 1003.1 limits file.
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*
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* MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
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* MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>)
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*/
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#include <sys/syslimits.h>
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#define MAXCOMLEN 19 /* max command name remembered */
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#define MAXINTERP 32 /* max interpreter file name length */
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#define MAXLOGNAME 17 /* max login name length (incl. NUL) */
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#define MAXUPRC CHILD_MAX /* max simultaneous processes */
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#define NCARGS ARG_MAX /* max bytes for an exec function */
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#define NGROUPS NGROUPS_MAX /* max number groups */
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#define NOFILE OPEN_MAX /* max open files per process */
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#define NOGROUP 65535 /* marker for empty group set member */
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#define MAXHOSTNAMELEN 256 /* max hostname size */
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#define SPECNAMELEN 63 /* max length of devicename */
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/* More types and definitions used throughout the kernel. */
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#ifdef _KERNEL
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#if 0
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#if (defined(BURN_BRIDGES) || __FreeBSD_version >= 600000) \
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&& defined(OBSOLETE_IN_6)
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#error "This file contains obsolete code to be removed in 6.0-current"
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#endif
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#endif
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#include <sys/cdefs.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/priority.h>
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#define FALSE 0
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#define TRUE 1
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#endif
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#ifndef _KERNEL
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/* Signals. */
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#include <sys/signal.h>
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#endif
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/* Machine type dependent parameters. */
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#include <machine/param.h>
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#ifndef _KERNEL
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#include <sys/limits.h>
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#endif
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#ifndef _NO_NAMESPACE_POLLUTION
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#ifndef DEV_BSHIFT
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#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
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#endif
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#define DEV_BSIZE (1<<DEV_BSHIFT)
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#ifndef BLKDEV_IOSIZE
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#define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */
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#endif
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#ifndef DFLTPHYS
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#define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
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#endif
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#ifndef MAXPHYS
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#define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
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#endif
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#ifndef MAXDUMPPGS
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#define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE)
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#endif
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/*
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* Constants related to network buffer management.
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* MCLBYTES must be no larger than PAGE_SIZE.
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*/
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#ifndef MSIZE
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#define MSIZE 256 /* size of an mbuf */
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#endif /* MSIZE */
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#ifndef MCLSHIFT
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#define MCLSHIFT 11 /* convert bytes to mbuf clusters */
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#endif /* MCLSHIFT */
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#define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */
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/*
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* Some macros for units conversion
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*/
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/* clicks to bytes */
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#ifndef ctob
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#define ctob(x) ((x)<<PAGE_SHIFT)
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#endif
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/* bytes to clicks */
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#ifndef btoc
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#define btoc(x) (((vm_offset_t)(x)+PAGE_MASK)>>PAGE_SHIFT)
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#endif
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/*
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* btodb() is messy and perhaps slow because `bytes' may be an off_t. We
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* want to shift an unsigned type to avoid sign extension and we don't
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* want to widen `bytes' unnecessarily. Assume that the result fits in
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* a daddr_t.
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*/
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#ifndef btodb
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#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
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(sizeof (bytes) > sizeof(long) \
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? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
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: (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
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#endif
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#ifndef dbtob
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#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
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((off_t)(db) << DEV_BSHIFT)
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#endif
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#endif /* _NO_NAMESPACE_POLLUTION */
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#define PRIMASK 0x0ff
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#define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */
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#define PDROP 0x200 /* OR'd with pri to stop re-entry of interlock mutex */
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#define NZERO 0 /* default "nice" */
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#define NBBY 8 /* number of bits in a byte */
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#define NBPW sizeof(int) /* number of bytes per word (integer) */
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#define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */
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#define NODEV (dev_t)(-1) /* non-existent device */
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#define CBLOCK 128 /* Clist block size, must be a power of 2. */
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#define CBQSIZE (CBLOCK/NBBY) /* Quote bytes/cblock - can do better. */
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/* Data chars/clist. */
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#define CBSIZE (CBLOCK - sizeof(struct cblock *) - CBQSIZE)
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#define CROUND (CBLOCK - 1) /* Clist rounding. */
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/*
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* File system parameters and macros.
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*
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* MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes
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* per block. MAXBSIZE may be made larger without effecting
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* any existing filesystems as long as it does not exceed MAXPHYS,
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* and may be made smaller at the risk of not being able to use
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* filesystems which require a block size exceeding MAXBSIZE.
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*
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* BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the
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* minimum KVM memory reservation the kernel is willing to make.
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* Filesystems can of course request smaller chunks. Actual
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* backing memory uses a chunk size of a page (PAGE_SIZE).
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*
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* If you make BKVASIZE too small you risk seriously fragmenting
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* the buffer KVM map which may slow things down a bit. If you
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* make it too big the kernel will not be able to optimally use
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* the KVM memory reserved for the buffer cache and will wind
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* up with too-few buffers.
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*
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* The default is 16384, roughly 2x the block size used by a
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* normal UFS filesystem.
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*/
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#define MAXBSIZE 65536 /* must be power of 2 */
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#define BKVASIZE 16384 /* must be power of 2 */
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#define BKVAMASK (BKVASIZE-1)
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/*
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* MAXPATHLEN defines the longest permissible path length after expanding
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* symbolic links. It is used to allocate a temporary buffer from the buffer
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* pool in which to do the name expansion, hence should be a power of two,
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* and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the
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* maximum number of symbolic links that may be expanded in a path name.
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* It should be set high enough to allow all legitimate uses, but halt
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* infinite loops reasonably quickly.
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*/
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#define MAXPATHLEN PATH_MAX
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#define MAXSYMLINKS 32
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/* Bit map related macros. */
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#define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
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#define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
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#define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
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#define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
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/* Macros for counting and rounding. */
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#ifndef howmany
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#define howmany(x, y) (((x)+((y)-1))/(y))
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#endif
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#define rounddown(x, y) (((x)/(y))*(y))
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#define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */
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#define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
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#define powerof2(x) ((((x)-1)&(x))==0)
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/* Macros for min/max. */
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#define MIN(a,b) (((a)<(b))?(a):(b))
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#define MAX(a,b) (((a)>(b))?(a):(b))
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#ifdef _KERNEL
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/*
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* Basic byte order function prototypes for non-inline functions.
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*/
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#ifndef _BYTEORDER_PROTOTYPED
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#define _BYTEORDER_PROTOTYPED
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__BEGIN_DECLS
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__uint32_t htonl(__uint32_t);
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__uint16_t htons(__uint16_t);
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__uint32_t ntohl(__uint32_t);
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__uint16_t ntohs(__uint16_t);
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__END_DECLS
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#endif
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#ifndef lint
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#ifndef _BYTEORDER_FUNC_DEFINED
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#define _BYTEORDER_FUNC_DEFINED
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#define htonl(x) __htonl(x)
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#define htons(x) __htons(x)
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#define ntohl(x) __ntohl(x)
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#define ntohs(x) __ntohs(x)
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#endif /* !_BYTEORDER_FUNC_DEFINED */
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#endif /* lint */
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#endif /* _KERNEL */
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/*
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* Constants for setting the parameters of the kernel memory allocator.
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*
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* 2 ** MINBUCKET is the smallest unit of memory that will be
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* allocated. It must be at least large enough to hold a pointer.
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*
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* Units of memory less or equal to MAXALLOCSAVE will permanently
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* allocate physical memory; requests for these size pieces of
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* memory are quite fast. Allocations greater than MAXALLOCSAVE must
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* always allocate and free physical memory; requests for these
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* size allocations should be done infrequently as they will be slow.
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*
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* Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
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* MAXALLOCSIZE must be a power of two.
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*/
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#if defined(__alpha__) || defined(__ia64__) || defined(__sparc64__)
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#define MINBUCKET 5 /* 5 => min allocation of 32 bytes */
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#else
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#define MINBUCKET 4 /* 4 => min allocation of 16 bytes */
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#endif
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#define MAXALLOCSAVE (2 * PAGE_SIZE)
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/*
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* Scale factor for scaled integers used to count %cpu time and load avgs.
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*
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* The number of CPU `tick's that map to a unique `%age' can be expressed
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* by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that
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* can be calculated (assuming 32 bits) can be closely approximated using
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* the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
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*
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* For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
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* FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
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*/
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#define FSHIFT 11 /* bits to right of fixed binary point */
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#define FSCALE (1<<FSHIFT)
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#define dbtoc(db) /* calculates devblks to pages */ \
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((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT))
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#define ctodb(db) /* calculates pages to devblks */ \
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((db) << (PAGE_SHIFT - DEV_BSHIFT))
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#endif /* _SYS_PARAM_H_ */
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