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#
# 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 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.
#
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.