Darren Reed's ipfilter HISTORY file. This should satisfy the hordes

who have been asking what features are included in the latest ipf
import, while keeping the size of the commit messages down.

1 files changed, 1324 insertions, 0 deletions

diff --git a/sbin/ipf/HISTORY b/sbin/ipf/HISTORY
new file mode 100644
index 00000000000..ff068aa3779
--- /dev/null
+++ b/sbin/ipf/HISTORY
@@ -0,0 +1,1324 @@
+# $OpenBSD: HISTORY,v 1.1 1999/12/28 07:46:01 kjell Exp $
+#
+# NOTE: Quite a few patches and suggestions come from other sources, to whom
+#       I'm greatly indebted, even if no names are mentioned.
+#
+# Thanks to the Coombs Computing Unit at the ANU for their continued support
+# in providing a very available location for the IP Filter home page and
+# distribution center.
+#
+# Thanks to Tel.Net Media for allowing me to maintain and further develop
+# IP Filter as part of my job and supplying Sun equipment for testing the
+# move to 64bits.
+#
+# Thanks to BSDI for providing object files for BSD/OS 3.1 and the means
+# to further support development of IP Filter under BSDI.
+#
+# Thanks to Craig Bishop of connect.com.au and Sun Microsystems for the
+# loan of a machine to work on a Solaris 2.x port of this software.
+#
+# Thanks also to all those who have contributed patches and other code,
+# and especially those who have found the time to port IP Filter to new
+# platforms.
+#
+3.3.5	11/12/1999 - Released
+
+fix parsing of "log level" and printing it back out too
+
+<net/if_types.h> is only present on Solaris2.6/7/8
+
+use send_icmp_err rather than icmp_error to send back a frag-needed error
+when doing PMTU
+
+do not use -b with add_drv on Solaris unless $BASEDIR is set.
+
+fix problem where source address in icmp replies is reversed
+
+fix yet another problem with real audio.
+
+3.3.4	4/12/1999 - Released
+
+patches from Guido: fix panic in ip_state:fr_checkicmpmatchingstate(), fix
+byte order problem in ip_id (host order when called from ip_input(), vs
+network byte order when called from ip_output()) and  fix a problem where the
+fragment cache was never timedout early.
+
+fix up the real audio proxy to properly setup state information and NAT
+entries, thanks to Laine Stump for testing/advice/fixes.
+
+fix ipfr_fastroute to set dst->sin_addr (Sean Farley - appears to prevent
+FreeBSD 3.3 from panic'ing) as this had been removed in prior hacks to this
+routine.
+
+fix kinstall for BSDI
+
+support ICMP errors being allowed through for ICMP packets going out with
+keep state enabled
+
+support hardware checksumming (gigabit ethernet cards) on Solaris thanks to
+Tel.Net Media for providing hardware for testing.
+
+patched from Frank Volf for ipmon (ICMP & fragmented packets) and allowing
+ICMP responses to ICMP packets in the keep state table.
+
+add in patches for hardware checksumming under solaris
+
+Solaris install scripts now use $BASEDIR as appropriate.
+
+add Solaris8 support
+
+fix "ipf -y" on solaris so that it rescans rules also for changes in
+interface pointers
+
+let ipmon become a daemon with -D if it is using syslog
+
+fix parsing of return-icmp-as-dest(foo)
+
+add reference to ipfstat -g to ipfstat.8
+
+ipf_mutex needs to be declared for irix in ip_fil.c
+
+3.3.3	22/10/1999 - Released
+
+add -g command line option to ipfstat to show groups still define.
+
+fix problem with fragment table not recording rule pointer when called
+from state functions (fin_fr not set).
+
+fixup fastroute problems with keep state rules.
+
+load rules into inactive set first, so we don't disable things like NIS
+lookups half way through processing - found by Kevin Littlejohn
+
+fix handling of unaligned ip pointer for solaris
+
+patch for fr_newauth from Rudi Sluijtman
+
+fixed htons() bug in fr_tcpsum() where ip_p wasn't cast to u_short
+
+3.3.2	23/09/1999 - Released
+
+patches from Scott Presnell to fix rcmd proxy
+
+patches from Greg to fix Solaris detachment of interfaces
+
+add openbsd compatibility fixes
+
+fix free'ing already freed memory in ipfr_slowtimer()
+
+fix for deferencing invalid memory in cleaning up after a device disappears
+
+3.3.1	14/8/1999 - Released
+
+remove include file sys/user.h for irix
+
+prevent people from running buildsunos directly
+
+fix up some problems with the saving of rule pointers so that NAT saves
+that information in case it should need to call fr_addstate() from a proxy.
+
+fix up scanning for the end of FTP messages
+
+don't remove /etc/opt/ipf in postremove
+
+attempt to prevent people running buildsolaris script without doing a
+"make solaris"
+
+fix timeout losing on freebsd3
+
+3.3	7/8/1999 - Released
+
+NAT: information (rules, mappings) are stored in hash tables; setup some
+basic NAT regression testing.
+
+display version name of installed kernel code when initializing.
+
+add -V command line option to ipf, showing version (program and kernel
+module) as well as the run-status of the kernel code.
+
+fix problem with "log" rules actually affecting result of filtering.
+
+automatically use SUNWspro if available and on a 64bit Solaris system for
+compiling.
+
+add kernel proxies for rcmd(3) and RealAudio (PNA)
+
+use timeout/untimeout on SunOS4/BSD platforms too rather than hijacking
+ip_slowtimo
+
+fix IP headers generated through parsing of text information
+
+fix NAT rules to be in the correct order again.
+
+make keep-state work with to/fastroute keywords and enforce usage of those
+interfaces.
+
+update keep-state code with new algorithm from Guido
+
+add FreeBSD-3 support
+
+add return-icmp-as-dest option to retrun an ICMP packet using the original
+destination as the source rather than a local IP address
+
+add "level [facility.]<priority>" option to filter language
+
+add changes from Guido to state code.
+
+add code to return EPERM if the device is opened for writing and we're
+in securelevel 2 or greater.
+
+authentication code patches from Guido
+
+fix real audio proxy
+
+fix ipmon rule printing of interfaces and add IN/OUT to the end of ipmon
+log output.
+
+fix bimap rules with hash tables
+
+update addresses used in NAT mappings for 0/32 rules for any protocol but TCP
+if it changes on the interface - check every ip_natexpire()
+
+add redirect regression test
+
+count buckets used in the state hash table.
+
+fix sending of RST's with return-rst to use the ack number provided in
+the packet being replied to in addition to the sequence number.
+
+fix to compile as a 64bit application on solaris7-64bit
+
+add NAT IP mapping to ranges of IP addresses that aren't CIDR specified
+
+fix calculation of in_space parameter for NAT
+
+fix `wrapping' when incrementing the next ip address for use in NAT
+
+fix free'ing of kernel memory in ip_natunload on solaris
+
+fix -l/-U command line options from interfering with each other
+
+fix fastroute under solaris2 and cleanup compilation for solaris7
+
+add install scripts and compile cleanly on BSD/OS 4.0
+
+safely open files in /tmp for writing device output when testing.
+
+fix uninitialized pointer bug in NAT
+
+fix SIOCZRLST (zero list rule stats) bug with groups
+
+change some usage of u_short to u_int in function calling
+
+fix compilation for Solaris7 (SUNWspro)
+
+change solaris makefiles to build for either sparc or i386 rather than
+per-cpu (sun4u, etc).
+
+fixed bug in ipllog
+
+add patches from George Michaelson for FreeBSD 3.0
+
+add patch from Guido to provide ICMP checking for known state in the same
+manner as is done for NAT.
+
+enable FTP PASV proxying and enable wildcarding in NAT/state code for ports
+for better PORT/PASV support with FTP.
+
+bring into main tree static nat features: map-block and "auto" portmapping.
+
+add in source host filtering for redirects (alan jones)
+
+3.2.10		22/11/98 - Released
+
+3.2.10beta9	17/11/98 - Released
+
+fix fr_tcpsum problems in handling mbufs with an odd number of bytes
+and/or split across an mbuf boundary
+
+fix NAT list entry comparisons and allow multiple entries for the same
+proxy (but on different ports).
+
+don't create duplicate NAT entries for repeated PORT commands.
+
+3.2.10beta8	14/11/98 - Released
+
+always exit an rwlock before expecting to enter it again on solaris
+
+fix loop in nat_new for pre-existing nat
+
+don't setup state for an ftp connection if creating nat fails.
+
+3.2.10beta7	05/11/98 - Released
+
+set fake window in ipft_tx.c to ensure code passes tests.
+
+cleaned up/enhanced ipnat -l/ipnat -lv output
+
+fixed NAT handling of non-TCP/UDP packets, esp. for ICMP errors returned.
+
+Solaris recusive mutex on icmp-error/tcp-reset - requires rwlock's rather
+than mutexes.
+
+3.2.10beta6	03/11/98 - Released
+
+fix mixed use of krwlock_t and kmutex_t on Solaris2
+
+fix FTP proxy back up, splitting pasv code out of port code.
+
+3.2.10beta5	02/11/98 - Released
+
+fixed port translation in ICMP reply handling
+
+3.2.10beta4	01/11/98 - Released
+
+increase useful statistic collection on solaris
+
+filter DL_UNITDATA_REQ as well as DL_UNITDATA_IND on solaris
+
+disable PASV reply translation for now
+
+fail with an error if we try to load a NAT rule with a non-existant
+   proxy name - Guido
+
+fix portmap usage with 0/0 and 0/32 map rules
+
+remove ap_unload/ap_expire - automatically done when NAT is cleaned up
+
+print "STATE:CLOSED" from ipmon if the connection progresses past established
+   rather than "STATE:EXPIRED"
+
+3.2.10beta3	26/10/98 - Released
+
+fixed traceroute/nat problem
+
+rewrote nat/proxy interface
+
+ipnat now lists associated proxy sessions for each NAT where applicable
+
+3.2.10beta2	13/10/98 - Released
+
+use KRWLOCK_T in place of krwlock_t for solaris as well as irix
+
+disable use of read-write lock acquisition by default
+
+add in mb_t for linux, non-kernel
+
+some changes to progress compilation on linux with glibc
+
+change PASV as well as PORT when passed through kernel ftp proxy.
+
+don't allow window to become 0 in tcp state code
+
+make ipmon compile cleaner
+
+irix patches
+
+3.2.10beta	11/09/98 - Released
+
+stop fr_tcpsum() thinking it has run out of data when it hasn't.
+
+stop solaris panics due to fin_dp being something wild.
+
+revisit usage of ATOMIC_*()
+
+log closing state of TCP connection in "keep state"
+
+fix fake-arp table code for ipsend.
+
+ipmon now writes pid to a file.
+
+fix "ipmon -a" to actually activate all logging devices.
+
+add patches for BSDOS4.
+
+perl scripts for log analysis donated.
+
+3.2.9	22/06/98 - Released
+
+fix byte order for ICMP packets generated on Solaris
+
+fix some locking problems.
+
+fix malloc bug in NAT (introduced in 3.2.8).
+
+patch from guido for state connections that get fragmented
+
+3.2.8	08/06/98 - Released
+
+use readers/writers locks in Solaris2 in place of some mutexes.
+
+Solaris2 installation enhancements - Martin Forssen (maf@carlstedt.se)
+
+3.2.7	24/05/98 - Released
+
+u_long -> u_32_t conversions
+
+patches from Bernd Ernesti for NetBSD
+
+fixup ipmon to actually handle HUP's.
+
+Linux fixes from Michael H. Warfield (mhw@wittsend.com)
+
+update for keep state patch (not security related) - Guido
+
+dumphex() uses stdout rather than log
+
+3.2.6	18/05/98 - Released
+
+fix potential security loop hole in keep state code.
+
+update examples.
+
+3.2.5	09/05/98 - Released
+
+BSD/OS 3.1 .o files added for the kernel.
+
+fix sequence # skew vs window size check.
+
+fix minimum ICMP header size check.
+
+remove references to Cybersource.
+
+fix my email address.
+
+remove ntohl in ipnat - Thomas Tornblom
+
+3.2.4	09/04/98 - Released
+
+add script to make devices for /dev on BSD boxes
+
+fixup building into the kernel for FreeBSD 2.2.5
+
+add -D command line option to ipmon to make it a daemon and SIGHUP causes
+it to close and reopen the logfile
+
+fixup make clean and make package for SunOS5 - Marc Boucher
+
+postinstall keeps adding "minor=ipf ipl" - George Ross <gdmr@dcs.ed.ac.uk>
+
+protected by IP Filter gif - Sergey Solyanik <solik@atom.ru>
+
+3.2.3	10/11/97 - Released
+
+fix some iplang bugs
+
+fix tcp checksum data overrun, sgi #define changes,
+avoid infinite loop when nat'ing to single IP# - Marc Boucher
+
+fixup DEVFS usage for FreeBSD
+
+fix sunos5 "make clean" cleaning up too much
+
+3.2.2	28/11/97 - Released
+
+change packet matching to return actual error, if bad packet, to facilitate
+ECONNRESET for TCP.
+
+allow ip:netmask in grammar too now - Guido
+
+assume IRIX has u_int32_t in sys/types.h (needed for R10000)
+
+rewrite parts of command line options for ipmon
+
+fix TCP urgent packet & offset testing and add LAND attack test for iptest
+
+fix grammar error in yacc grammar for iplang
+
+redirect (rdr) destination port bytes-wapped when it shouldn't be.
+
+general: fr_check now returns error code, such as EHOSTUNREACH or
+ECONNRESET (attempt to make ECONNRESET work for locally outbound
+packets).
+
+linux: enable return-rst, need to filter tcp retransmits which are sent
+       separately from normal packets
+
+memory leak plugged in ip_proxy.c
+
+BSDI compatibility patches from Guido
+
+tcp checksum fix - Marc Boucher
+
+recursive mutex and ioctl param fix - Marc Boucher
+
+3.2.1	12/11/97 - Released
+
+port to BSD/OS 3.0
+
+port to Linux 2.0.31
+
+patches to make "map a/m -> 0/0" work with ftp proxying properly - Marc Boucher
+
+add "ipf -F s" and "ipf -F S" to flush state table entries.
+
+announce if logging is on or off when ip filter initializes.
+
+"ipf -F a" doesn't flush groups properly for Solaris.
+
+3.2		30/10/97 - Released
+
+ipnat doesn't successfully remove proxy mappings with "-rf" -
+Alexander Romanyu
+
+use K&R C function style for solaris kernel code
+
+use m_adj() to decrease packet size in ftp proxy
+
+use mbufchainlen rather than msgdsize,
+IRIX update - Marc Boucher
+
+fix NetBSD modunload bug (pfil_add_hook done twice)
+
+patches for OpenBSD 2.1 - Craig Bevins <craigb@bitcom.net.au>
+
+3.2beta10	24/10/97 - Released
+
+fix fragment table entries allocated for NAT.
+
+fix tcp checksum calculations over mbuf/mblk boundaries
+
+fix panic for blen < 0 in ftp kernel proxy - marc boucher
+
+fix flushing of rules which have been grouped.
+
+3.2beta9	20/10/97 - Released
+
+some nit picking on solaris2 with SUNWspro - Michael Lyle <mrl@rpnet.net>
+
+ftp kernel proxy patches from Marc Boucher
+
+3.2beta8	13/10/97 - Released
+
+add support for passing ICMP errors back through NAT.
+
+IRIX port update - Marc Boucher
+
+calculate correct MIN size of packet to log for UDP - Marc Boucher
+
+need htons(ETHERTYPE_x) on little endian BSD boxes - Dave Huang
+
+copyright header fixups
+
+3.2beta7	23/09/97 - Released
+
+fickup problems introduced by prior merges & changes.
+
+3.2beta6	23/09/97 - Released
+
+patch for spin-reading race condition - Marc Boucher.
+
+IRIX port by Marc Boucher.
+
+compatibility updates for Linux to ipsend
+
+3.2beta5	13/09/97 - Released
+
+patches from Bernd Ernesti for NetBSD integration (mostly prototyping and
+compiler warning things)
+
+ipf -y will resync IP#'s allocated with 0/32 in NAT to match interface if it
+changes.
+
+update manual pages and other documentation updates.
+
+3.2beta4	27/8/97 - Released
+
+enable setting IP and TCP options for iplang/
+
+Solaris2 patches from Marc Boucher.
+
+add groups for filter rules.
+
+3.2beta3	21/8/97 - Released
+
+patches for Solaris2 (interface panic solution ?): fix FIONREAD and
+replacing q_qinfo points - Marc Boucher <marc@CAM.ORG>
+
+change ipsend/* and ipsd/* copyright notices to be the same as ip filter's
+
+patch for SYN-ACK skew testing fix from Eric V. Smith <EricSmith@windsor.com>
+
+3.2beta2	6/8/97 - Released
+
+make it load on Solaris 2.3
+
+rewrote logging to remove solaris errors, introduced checking to see if the
+same packet is logged successively.
+
+fix filter cache to work when there are no rules loaded.
+
+add "raw" option to ipresend to send entire ethernet frames.
+
+nat list corruption bug - NetBSD - Klaus Klein
+
+3.2beta1	5/7/97 - Released
+
+patches from Jason Thorpe fixing: UNSIGNED_CHAR lossage, off_t being 64bits
+lossage, and other NetBSD bits.
+
+NetBSD 1.2G update.
+
+fixup fwtk patches and add protocol field for SIOCGNATL.
+
+rdr bugs reported by Alexander Romanyu (alexr@aix.krid.crimea.ua), with
+fixes:
+* rdr matched all packets of a given protocol (ignored ports).
+* severe bug in nat_delete which caused system crash/freeze.
+
+change Makefile so that CC isn't passed on for FreeBSD/NetBSD (will use
+the default CC - cc, not gcc)
+
+3.2alpha9	16/6/97 - Released
+
+added "skip" keyword.
+
+implement preauthentication of packets, as outlined by Guido.
+
+Make it compile as cleanly as possible with -Wall & general code cleanup
+
+getopt returns int, not char. Bernd Ernesti
+
+3.2alpha8	13/6/97 - Released
+
+code added to support "auth" rules which require a user program to allow them
+through.  First revision and much of the code came from Guido.
+
+hex output from ipmon doesn't goto syslog when recovering from out of sync
+error.  Luke Mewburn (lukem@connect.com.au)
+
+fix solaris2.6 lookup of destination ire's.
+
+ipnat doesn't throw away unused bits (after masking), causing it to
+behave incorrectly. Carson Gaspar
+
+NAT code doesn't include inteface name when matching - Alexey Mavrin
+<lha@elco.spb.ru>
+
+replace old SunOS tcpip.h with new tcpip.h (from 4.4BSD) - Jason Thorpe.
+
+update install procedures to include ip_proxy.c
+
+mask out unused bits in NAT/RDR rules.
+
+use a generic type (u_32_t) for 32bit variables, rather than rely on
+u_long being such - Jason Thorpe.
+
+create a local "netinet" directory and include from ~netinet/*" rather than
+just "*" to make keeping the code working on ports easier.
+
+add an m_copydata and m_copyback for SunOS4 (based on 4.4BSD-Lite versions)
+
+documentation updates.
+
+NetBSD update from Jason Thorpe <thorpej@netbsd.org>
+
+allow RST's through with a matching SEQ # and 0 ACK.  Guido Van Rooij
+
+ipmon uses excessive amounts of CPU on Solaris2 - Reinhard Bertram
+<Reinhard.Bertram@KOM.th-darmstadt.de>
+
+3.2alpha7	25/5/97 - Released
+
+add strlen for pre-2.2 kernels - Doug Kite <dkite@websgi.icomnet.com>
+
+setup bits and pieces for compiling into a FreeBSD-2.2 kernel.
+
+split up "bsd" targets.  Now a separate netbsd/freebsd/bsd target.
+mln_ipl.c has been split up into itself and mlf_ipl.c (for freebsd).
+
+fix (negative) host matching in filtering.
+
+add sysctl interface for some variables when compiled into FreeBSD-2.2 kernels
+or later.
+
+make all the candidates for kernel compiling include "netinet/..." and build
+a subdirectory "netinet" when compiling and symlink all .h files into this.
+
+add install make target to Makefile.ipsend
+
+3.2alpha6	8/5/97 - Released
+
+Add "!" (not) to hostname/ip matching.
+
+Automatically add packet info to the fragment cache if it is a fragment
+and we're translating addreses for.
+
+Automatically add packet info to the fragment cache if it is a fragment
+and we're "keeping state" for the packet.
+
+Solaris2 patches - Anthony Baxter (arb@connect.com.au)
+
+change install procedure for FreeBSD 2.2 to allow building to a kernel
+which is different to the running kernel.
+
+add FIONREAD for Solaris2!
+
+when expiring NAT table entries, if we would set a time to fr_tcpclosed
+(which is 1), make it fr_tcplaskack(20) so that the state tables have a
+chance to clear up.
+
+3.2alpha5
+
+add proxying skeleton support and sample ftp transparent proxy code.
+
+add printfs at startup to tell user what is happening.
+
+add packets & bytes for EXPIRE NAT log records.
+
+fix the "install-bsd" target in the root Makefile. Chris Williams
+<psion@mv.mv.com>
+
+Fixes for FreeBSD 2.2 (and later revs) to prevent panics.  Julian Assange.
+
+3.2alpha4	2/4/97 - Released
+
+Some compiler warnings cleaned up.
+
+FreeBSD-2.2 patches for LKM completed.
+
+3.2alpha3	31/3/97 - Released
+
+ipmon changes: -N for reading NAT logfile, -S for reading state logfile.
+-a for reading all.  -n now toggles hostname resolution.
+
+Add logging of new state entries and expiration of old state entries.
+count log successes and failures.
+
+Add logging of new NAT entries and expiration of old NAT entries.
+count log successes and failures.
+
+Use u_quad_t for records of bytes & packets where kept
+(IP Accounting: fr_hits, fr_bytes; IP state: is_pkts, is_bytes).
+
+Fixup use of CPU and DCPU in Makefiles.
+
+Fix broken 0/32 NAT mapping. Carl Makin <cmakin@nla.gov.au>
+
+3.2alpha2
+
+Implement mapping to 0/32 as being an alias for automatically using the
+interface's first IP address.
+
+Implement separate minor devices for both NAT and IP state code.
+
+Fully prototype all functions.
+
+Fix Makefile problem due to attempt to fix Sun compiling problems.
+
+3.1.10		23/3/97 - Released
+
+ipfstat -a requires a -i or -o command line option too.  Print an error
+when not present rather than attempt to do something.
+
+patch updates for SunOS4 for kernel compiling.
+patch for ipmon -s (flush's syslog file which isn't good).  Andrew J. Schorr
+<schorr@ead.dsa.com>
+
+too many people hit their heads hard when compiling code into the kernel
+that doesn't let any packets through. (fil.c - IPF_NOMATCH)
+
+icmp-type parsing doesn't return any errors when it isn't constructed
+correctly.  Neil Readwin
+
+Using "-conf" with modload on SunOS4 doesn't work.
+Timothy Demarest <demarest@arraycomm.com>
+
+Need to define ARCH in makefile for SunOS4 building.  "make sunos4"
+in INSTALL.SunOS is incorrect. James R Grinter <jrg@blodwen.demon.co.uk>
+[all SunOS targets now run buildsunos]
+
+NAT lookups are still incorrect, matching non-TCP/UDP with TCP/UDP
+information. ArkanoiD <ark@paranoid.convey.ru>
+
+Need to check for __FreeBSD_version being 199511 rather than 199607
+in mln_ipl.c. Eric Feillant <Eric.Feillant@EUnet.fr>
+
+3.1.9		8/3/97 - Released
+
+fixed incorrect lookup of active NAT entries.
+
+patch for ip_deq() wrong for pre 2.1.6 FreeBSD.
+fyeung@fyeung8.netific.com (Francis Yeung)
+
+check for out with return-rst/return-icmp at wrong place - Erkki Ritoniemi
+(erkki@vlsi.fi)
+
+text_readip returns the interface pointer pointing to text on stack -
+Neil Readwin
+
+fix from Pradeep Krishnan for printout rules "with not opt sec".
+
+3.1.8		18/2/97 - Released
+
+Diffs for ip_output.c and ip_input.c updated to fix bug with fastroute and
+compiling warnings about reuse of m0.
+
+prevent use of return-rst and return-icmp with rules blocking packets going
+out, preventing panics in certain situations.
+
+loop forms in frag cache table - Yury Pshenychny <yura@rd.zgik.zaporizhzhe.ua>
+
+should use SPLNET/SPLX around expire routines in NAT/frag/state code.
+
+redeclared malloc in 44arp.c - 
+
+3.1.7		8/2/97 - Released
+
+Macros used for ntohs/htons supplied with gcc don't always work very well
+when the assignment is the same variable being converted.
+
+Filter matching doesn't not match rule which checks tcp flags on packets
+which are fragments - David Wilson
+
+3.1.7beta	30/1/97 - Released
+
+Fix up NAT bugs introduced in last major change (now tested), including
+nat_delete(), nat_lookupredir(), checksum changes, etc.
+
+3.1.7alpha	30/1/97 - Released
+
+Many changes to NAT code, including contributions from Laurent Joncheray
+<lpj@ans.net>
+
+Use "NO_SLEEP" when allocating memory under SunOS.
+
+Make kernel printf's nicer for BSD/SunOS4
+
+Always do a checksum for packets being filtered going out and being
+processed by fastroute.
+
+Leave kernel to play with cdevsw on *BSD systems with LKM's.
+
+ipnat.1 man page fixes.
+
+3.1.6		21/1/97 - Released
+
+Allow NAT to work on BSD systems in conjunction with "pass .. to ifname"
+
+Memory leak introduced in 3.1.3 in NAT lists, clearing of NAT table tried
+to free memory twice.
+
+NAT recalculates IP header checksum based on difference between IP#'s and
+port numbers - should be just IP#'s (Solaris2 only)
+
+3.1.5		13/1/97 - Released
+
+fixed setting of NAT timeouts and use different timeouts for concurrent
+TCP sessions using the same IP# mapping (when port mapping isn't used)
+
+multiple loading/unloading of LKM's doesn't clean up cdevsw properly for
+*BSD systems.
+
+3.1.4		10/1/97	- Released
+
+add command line options -C and -F to ipnat to flush NAT list and table
+
+ipnat -l loops on output - Neil Readwin (nreadwin@nysales.micrognosis.com)
+
+NetBSD/FreeBSD kernel malloc changes - Daniel Carosone
+
+3.1.3		10/1/97 - Released
+
+NAT chains not constructed correctly in hash tables - Antony Y.R Lu
+(antony@hawk.ee.ncku.edu.tw)
+
+Updated INSTALL.NetBSD, INSTALL.FreeBSD and INSTALL.Sol2
+
+man page update (ipf.5) from Daniel Carosone (dan@geek.com.au)
+
+ICMP header checksum update now included in NAT.
+
+Solaris2 needs to modify IP header checksums in ip_natin and ip_natout.
+
+3.1.2		4/12/96 - Released
+
+ipmon doesn't use syslog all the time when given -s option
+
+fixed mclput panic in ip_input.c and replace ntohs() with NTOHS() macro
+
+check the results of hostname resolution in ipnat
+
+"make *install" fixed for subdirectories.
+
+problems with "ARCH:=" and gnu make resolved
+
+parser reports an error for lines with whitespaces only rather than skipping
+them. D.Carosone@abm.com.au (Daniel Carosone)
+
+patches for integration into NetBSD-current (post 1.2).
+
+add an option to allow non-IP packets going up/down the stream on Solaris2
+to be dropped. John Bass.
+
+3.1.2beta	21/11/96 - Released
+
+make ipsend compile on Linux 2.0.24
+
+changes to TCP kept state algorithm, making it watch state on TCP
+connections in both directions.  Also use the same algorithm for NAT TCP.
+
+-Wall cleanup - Bernd Ernesti
+
+added "or-block" for "pass .. log or-block" after a suggestion from
+David Oppenheim (davido@optimation.com.au)
+
+added subdirectories for building IP Filter in SunOS5/BSD for different
+cpu architecures
+
+Solaris2 fixes to logging and pre-filtering packet processing - 3.1.1p2
+
+mbuf logging not using mtod(), remove iplbusy - 3.1.1p1		1/11/96
+
+3.1.1		28/10/96 - Released
+
+Installation script fixes and deinstall scripts for IP Filter on:
+SunOS4/FreeBSD/NetBSD
+
+Man page fixes - Paul Dubois (dubois@primate.wisc.edu)
+
+Fix use of SOLARIS macro in ipmon, rewrote ipllog() (again!)
+
+parsing isn't completely case insensitive - David Wilson
+(davidw@optimation.com.au)
+
+Release ipl_mutex across uiomove() calls
+
+print entire rule entries out for "ipf -z" when zero'ing per-rule stats.
+
+ipfstat returns same output for "hits" in "ipfstat -aio" - Terletsky Slavik
+(ts@polynet.lviv.ua)
+
+New algorithm for setting timeouts for TCP connection (more closely follow
+TCP FSM) - Pradeep Krishnan (pkrishna@netcom.com)
+
+Track both window sizes for TCP connections through "keep state".
+
+Solaris2 doesn't like _KERNEL defined in stdargs.h - Jos van Wezel
+(wezel@bio.vu.nl)
+
+3.1.1-beta2	6/10/96 - Released
+
+Solaris2 fastroute/dup-to/to now works
+
+ipmon `record' reading rewritten
+
+Added post-NetBSD1.2 packet filter patches - Mathew Green (mrg@eterna.com.au)
+
+Attempt to use in_proto.c.diff, not "..diffs" for SunOS4 - David Wilson
+(davidw@optimation.com.au)
+
+Michael Ryan (mike@NetworX.ie) reports the following:
+* The Trumpet WinSock under Windows always sends its SYN packet with an ACK
+  value of 1, unlike any other implementation I've seen, which would set it
+  to zero.  The "keep state" feature of IP Filter doesn't work when receiving
+  non-zero ACK values on new connection requests.
+* */Makefile install rule doesn't install all the binaries/man pages
+* Make ipnat use "tcp/udp" instead of "tcpudp"
+* Print out "tcp/udp" properly
+* ipnat "portmap tcp" matches "portmap udp" when adding/removing
+* NAT dest. ip# increased by one on mask of 0xffffffff when it shouldn't
+
+3.1.1-beta	1/9/96 - Released
+
+add better detection of TCP connections closing to TCP state monitoring.
+
+fr_addstate() not called correctly for fragments.  "keep state" and
+"keep frag" code don't work together 100% - Songqing Cai
+(songqing_cai@sterling.com)
+
+call to fr_addstate() incorrect for adding state in combination with keeping
+fragment information - Songqing Cai (songqing_cai@sterling.com)
+
+KFREE() passed fp (incorrect) and not fr (correct) in ip_frag.c - John Hood
+(cgull@smoke.marlboro.vt.us)
+
+make ipf parser recognise '\\' as a `continued line' marker - Dima Ruban
+(dima@best.net)
+
+3.1.1-alpha	23/8/96 - Released
+
+kernel panic's when ICMP packets go through NAT code
+
+stats aren't zero'd properly with ipf -Z
+
+ipnat doesn't show port numbers correctly all the time and also add the
+protocol (tcp/udp/tcpudp) to rdr output - Carson Gaspar (carson@lehman.com)
+
+fast checksum fixing not 100% - backout patch - Bill Dorsey (dorsey@lila.com)
+
+NetBSD-1.2 patches from - VaX#n8 <vax@linkdead.paranoia.com>
+
+Usage() call error in fils.c - Ajay Shekhawat (ajay@cedar.buffalo.edu)
+
+ip_optcopy() staticly defined in ip_output.c in SunOS4 - Nick Hall
+(nrh@tardis.ed.ac.uk)
+
+3.1.0		7/7/96 - Released
+
+Reformatted ipnat output to be compatible with it's input, so that
+"ipnat -l | ipnat -rf -" is possible.
+
+3.1.0beta	30/6/96 - Released
+
+NetBSD-1.2 patches from Greg Woods (woods@most.weird.com)
+
+kernel module must not be installed stripped (Solaris2), as created by
+"make package" for Solaris2 - Peter Heimann
+(peter@i3.informatik.rwth-aachen.de)
+
+3.1.0alpha	5/6/96 - Released
+
+include examples in package for solaris2
+
+patches for removing an extra ip header checksum (FreeBSD/NetBSD/SunOS)
+
+removed trailing space from printouts of rules in ipf.
+
+ipresend supports the same range of inputs that ipftest does.
+
+sending a duplicate copy of a packet to another network devices is now
+supported. ("dup-to")
+
+sending a packet to an arbitary interface is now supported, irrespective
+of its actual route, with no ttl decrement.  Can also be routed without
+the ttl being decremented. ("to" and "fastroute").
+
+"call" option added to support calling a generic function if a packet is
+matched.
+
+show all (upto 4) recorded bytes from the interface name in logging from
+ipmon.
+
+support for using unix file permissions for read/write access on the device
+is now in place.
+
+recursive mutex in nat_new() for Solaris 2.x - Per L. Hagen <per@stibo.dk>
+
+ipftest doesn't call initparse() for THISHOST - Catherine Allen
+(cla@connect.com.au)
+
+Man page corrections from Rex Bona (rex@pengo.comsmiths.com.au)
+
+3.0.4		10/4/96 - Released
+
+looop in `parsing' IP packets with optlen 0 for ip options.
+
+rule number not initialized and resulted in unexpected results for state
+maching.
+
+option parsing and printing bugs - Pradeep Krishnan
+
+3.0.4beta	25/3/96	- Released
+
+wouldn't parse "keep flags keep state" correctly.
+
+SunOS4.1.x ip_input.c doesn't recognise all 1s broadcast address - Nigel Verdon
+
+patches for BSDI's BSD/OS 2.1 and libpcap reader on little endian systems
+from Thorsten Lockert <tholo@tetherless.com>
+
+b* functions in fil.c on Solaris 2.4
+
+3.0.3	17/3/96 - Released
+
+added patches to support IP Filter initialisation when compiled into the
+kernel.
+
+added -x option to ipmon to display hex dumps of logged packets.
+
+added -H option to ipftest to allow ascii-hex formatted input to specify
+arbitary IP packets.
+
+Sending TCP RSTs as a response now work for Solaris2 x86
+
+add patches to make IP Filter compile into NetBSD kernels properly.
+
+patch to stop SunOS 4.1.x kernels panicing with "data traps".
+
+ipfboot script unloads and reloads ipf module on Solaris2 if it is already
+loaded into the kernel.
+
+Installation of IP Filter as a Solaris2 package is now supported.
+
+Man pages for ipnat.4, ipnat.5 added.
+
+added some more regression tests and fixed up IP Filter to pass the new tests
+(previous versions failed some of the tests in set 12).
+
+IP option filter processing has changed so that saying "with opt lsrr" will
+check only for that one, but not mask out other options, so a packet with
+strict source routing, along with loose source routing will match all of
+"with opt lsrr", "with opt ssrr" and "with opt lsrr,ssrr".
+
+IPL_NAME needed in ipnat.c - Kelly (kelly@count04.mry.scruznet.com)
+
+patches for clean NetBSD compilation from Bernd Ernesti (bernd@arresum.inka.de)
+
+make install is incorrect - Julian Briggs (julian@lightwork.co.uk)
+
+strtol() returns 0x7fffffff for all negative numbers,
+printfr() generates incorrect output for "opt sec-class *",
+handling of "not opt xxx opt yyy" incorrect.
+- Minh Tonthat (minht@sbei.com)/Pradeep Krishnan (pradeepk@sbei.com)
+
+m_pullup() called only for input and not output; caused problems
+with filtering icmp - Nigel Verdon (verdenn@gb.swissbank.com)
+
+parsing problem for "port 1" and NetBSD patches incorrect -
+Andreas Gustafsson (gson@guava.araneus.fi)
+
+3.0.2	4/2/96 - Released
+
+Corrected bug where NAT recalculates checksums for fragments.
+
+make NAT recalculate UDP checksums (rather than setting them to 0),
+if they're non-zero.
+
+DNS patches - Real Page (Real.Page@Matrox.com)
+
+alteration of checksum recalculations in NAT code and addition of
+redirection with NAT - Mike Neuman
+
+core dump, if tcp/udp is used with a port number and not service name,
+in ipf - Mike Neuman (mcn@engarde.com)
+
+initparse() call, missing to prime "<thishost>" hook - Craig Bishop
+
+3.0.1	14/1/96 - Released
+
+miscellaneous patches for Solaris2
+
+3.0	14/1/96	- Released
+
+Patch included for FDDI, from Richard Ohnemus
+(Richard_Ohnemus@dallas.csd.sterling.com)
+
+Code cleanup for release.
+
+3.0beta4 10/1/96
+
+recursive mutex in ipfr_slowtimer fixed, reported by Craig Bishop
+
+recursive mutex in sending TCP RSTs fixed, reported by Tony Becker
+
+3.0beta3 9/1/96
+
+FIxup for Solaris2.5 install and interface name bug in ipftest from
+Julian Briggs (julian@lightwork.co.uk)
+
+Byte order patches for ipmon from Tony Becker (tony@mcrsys.com)
+
+3.0beta2 7/1/96
+
+Added the (somewhat warped) IP accounting as it exists in ipfw on FreeBSD.
+Note, this isn't really what one would call IP account, when compared to
+process accounting, sigh.
+
+Split up ipresend into iptest/ipresend/ipsend
+
+Added another m_pullup() inside fr_check() for BSD style kernels and
+added some checks to ipllog() to not log more than is present (for short
+packets).
+
+Fixed bug where failed hostname/netname resolution goes undetecte and
+becomes 0.0.0.0 (any) (reported Guido van Rooij)
+
+3.0beta	11/11/95	- Released
+
+Rewrote the way rule testing is done, reducing the number of files needed and
+generated.
+
+SIOCIPFFL was incorrectly affected by IPFILTER_LOG (Mathew Green)
+
+Patches from Guido van Rooij to fix sending back TCP RSTs on Net-2/Net-3
+BSD based Unixes (panic'd)
+
+Patches for FreeBSD/i86 ipmon from Riku Kalinen <riku@tequila.nixu.fi>
+(I think someone else already told me about these but they got lost :-/)
+
+Changed Makefile structure to build object files for different operating
+systems in separate directories by default.
+
+BSDI has ef0 for first ethernet interface
+
+Allow for a "not" operator before optional keywords.
+
+The "rule number" was being incorrectly incremented every time it went through
+the loop rather than when it matched a rule.
+
+2.8.2	24/10/95	- Released
+
+Fixed up problems with "textip" for doing lots of testing.
+
+Fixed bug in detection of "short" tcp/ip packets (all reported as being short).
+
+Solaris 2.4 port now works 100%.
+
+Man page errors reported and fixed.
+
+Removed duplicate entry in etc/services for login on port 49 (Craig Bishop).
+
+Fixed ipmon output to put a space after the log-letter.
+
+Patch from Guido van Rooij to fix parsing problem.
+
+2.8.1	15/10/95	- Released
+
+Added ttl and tos filtering.
+
+Patches for fixing up compilation and port problems (little endian)
+from Guido van Rooij <guido@IAEhv.nl>.
+
+Man page problems reported and fixed by Carson Gaspar <carson@lehman.com>.
+
+ipsend doesn't compile properly on Solaris2.4
+
+Lots of work done for Solaris2.4 to make it MT/MP safe and work.
+
+2.8	15/9/95		- Released
+
+ipmon can now send messages to syslogd (-s) and use names instead of
+numbers (-N).
+
+IP packets are now "compiled" into a structure only containing filterable
+bits.
+
+Added regression testing in the test/ subdirectory, using a new option
+(-b) with the ipftest program.
+
+Added "nomatch" return to filter results.  These are counted and show
+up in reports from ipfstat.
+
+Moved filter code out of ip_fil.c and into fil.c - there is now only one
+instance of it in the package.
+
+Added Solaris 2.4 support.
+
+Added IPSO basic security option filtering.
+
+Added name support for filtering on all 19 named IP options.
+
+Patches from Ivan Brawley to log packet contents as well as packet headers.
+
+Update for sun/conf.c.diff from Ivan Brawley <ibrawley@awadi.com.AU>
+
+Added patches for FreeBSD 1, and added two new switches (-E, -D) to ipf,
+along with a new ioctl, SIOCFRENB.
+From: Dieter Dworkin Muller <dworkin@village.org>
+
+2.7.3	31/7.95		- Released
+
+Didn't compile cleanly without IPFILTER_LOG defined (Mathew Green).
+
+ipftest now deals with tcpdump3 binary output files (from libpcap) with -P.
+
+Brought ipftest program upto date with actual filter code.
+
+Filter would cause a match to occur when it wasn't meant to if the packet
+had short headers and was missing portions that should have been there.
+Err, it would rightly not match on them, but their absence caused a match
+when it shouldn't have been.
+
+2.7.2	26/7/95		- Released
+
+Problem with filtering just SYN flagged packets reported by
+Dieter Dworkin Muller <dworkin@village.org>.  To solve this
+problem, added support for masking TCP flags for comparison "flags X/Y".
+
+2.7.1	9/7/95		- Released
+
+Added ip_dirbroadcast support for Sun ip_input.c
+
+Fixed up the install scripts for FreeBSD/NetBSD to recognise where they are
+better.
+
+2.7	7/7/95		- Released
+
+Added "return-rst" to return TCP RST's to TCP packets.
+
+Actually ported it to FreeBSD-i386 2.0.0, so it works there properly now.
+
+Added insertion of filter rules.  Use "@<#>" at the beginning of a filter
+to insert a rule at row #.
+
+Filter keeps track of how many times each rule is matched.
+
+Changed compile time things to match kernel option (IPFILTER_LKM &
+IPFILTER_LOG).
+
+Updated ip_input.c and ip_output.c with paches for 3.5 Multicast IP.
+(No change required for 3.6)
+
+Now includes TCP fragments which start inside the TCP header as being short.
+Added counting the number of times each rule is matched.
+
+
+2.6	11/5/95		- Released
+
+Added -n option to ipf: when supplied, no changes are made to the kernel.
+
+Added installation scripts for SunOS 4.1.x and NetBSD/FreeBSD/BSDI.
+
+Rewrote filtering to use a more generic mask & match procedure for
+checking if a packet matches a rule.
+
+2.5.2	27/4/95		- Released
+
+"tcp/udp" and a non-initialised pointer caused the "proto" to become
+a `random' value; added "ip#/dotted.mask" notation to the BNF.
+From Adam W. Feigin  <feigin@iis.ee.ethz.ch>
+
+2.5.1	22/3/95		- Released
+
+"tcp/udp" had a strange effect (undesired) on getserv*() functions,
+causing protocol/service lookups to fail.  Reported by Matthew Green.
+
+2.5	17/3/95		- Released
+
+Added a new keyword "all" to BNF and parsing of tcpdump/etherfind/snoop
+output through the ipftest program.  Suggestions from:
+Michael Ciavarella (mikec@phyto.apana.org.au)
+
+Conflicts occur when "general" filter rules are used for ports and the
+lack of a "proto" when used with "port" matches other packets when only
+TCP/UDP are implied.
+Reported Matthew Green (mrg@fulcom.com.au);
+reported & fixed 6-8/3/95
+
+Added filtering of short TCP packets using "with short" 28/2/95
+(These can possibly slip by checks for the various flags).  Short UDP
+or ICMP are dropped to the floor and logged.
+
+Added filtering of fragmented packets using "with frag" 24/2/95
+
+Port to NetBSD-current completed 20/2/95, using LKM.
+
+Added logging of the rule # which caused the logging to happen and the
+interface on which the packet is currently as suggested by
+Andreas Greulich (greulich@math-stat.unibe.ch) 10/2/95
+
+2.4	9/2/95		- Released
+Fixed saving of IP headers in ICMP packets.
+
+2.3	29/1/95
+Added ipf -F [in|out|all] to flush filter rule sets (SIOCIPFFL).
+Fixed iplread() and iplsave() with help from Marc Huber.
+
+2.2	7/1/95		- Released
+Added code from Marc Huber <huber@fzi.de> to allow it to allocate
+its own major char number dynamically when modload'ing.  Fixed up
+use of <, >, <=, >= and >< for ports.
+
+2.1	21/12/94	- Released
+repackaged to include the correct ip_output.c and ip_input.c *goof*
+
+2.0	18/12/94	- Released
+added code to check for port ranges - complete.
+rewrote to work as a loadable kernel module - complete.
+
+1.1
+added code for ouput filtering as well as input filtering and added support for logging to a simple character device of packet headers.
+
+1.0	22/04/93	- Released
+First release cut.