Commit Graph

65 Commits

Author SHA1 Message Date
Alfred Perlstein
4d77a549fe Remove __P. 2002-03-19 21:25:46 +00:00
Yaroslav Tykhiy
37b5d6e33d Implement matching IP precedence in ipfw(4).
Submitted by:	Igor Timkin <ivt@gamma.ru>
2001-12-21 18:43:02 +00:00
Luigi Rizzo
7b109fa404 MFS: sync the ipfw/dummynet/bridge code with the one recently merged
into stable (mostly , but not only, formatting and comments changes).
2001-11-04 22:56:25 +00:00
Josef Karthauser
06dae58b17 A few more style changes picked up whilst working on an MFC to -stable. 2001-10-29 15:09:07 +00:00
Josef Karthauser
f227535cd8 Fix some whitespace, and a comment that I missed in the last commit. 2001-10-29 14:08:51 +00:00
Josef Karthauser
25549c009a Clean up the style of this header file. 2001-10-29 04:41:28 +00:00
Luigi Rizzo
830cc17841 Two main changes here:
+ implement "limit" rules, which permit to limit the number of sessions
   between certain host pairs (according to masks). These are a special
   type of stateful rules, which might be of interest in some cases.
   See the ipfw manpage for details.

 + merge the list pointers and ipfw rule descriptors in the kernel, so
   the code is smaller, faster and more readable. This patch basically
   consists in replacing "foo->rule->bar" with "rule->bar" all over
   the place.
   I have been willing to do this for ages!

MFC after: 1 week
2001-09-27 23:44:27 +00:00
Luigi Rizzo
32f967a3c0 A bunch of minor changes to the code (see below) for readability, code size
and speed. No new functionality added (yet) apart from a bugfix.
MFC will occur in due time and probably in stages.

BUGFIX: fix a problem in old code which prevented reallocation of
the hash table for dynamic rules (there is a PR on this).

OTHER CHANGES: minor changes to the internal struct for static and dynamic rules.
Requires rebuild of ipfw binary.

Add comments to show how data structures are linked together.
(It probably makes no sense to keep the chain pointers separate
from actual rule descriptors. They will be hopefully merged soon.

keep a (sysctl-readable) counter for the number of static rules,
to speed up IP_FW_GET operations

initial support for a "grace time" for expired connections, so we
can set timeouts for closing connections to much shorter times.

merge zero_entry() and resetlog_entry(), they use basically the
same code.

clean up and reduce replication of code for removing rules,
both for readability and code size.

introduce a separate lifetime for dynamic UDP rules.

fix a problem in old code which prevented reallocation of
the hash table for dynamic rules (PR ...)

restructure dynamic rule descriptors

introduce some local variables to avoid multiple dereferencing of
pointer chains (reduces code size and hopefully increases speed).
2001-09-20 13:52:49 +00:00
Poul-Henning Kamp
bb07ec8c84 Introduce a new feature in IPFW: Check of the source or destination
address is configured on a interface.  This is useful for routers with
dynamic interfaces.  It is now possible to say:

        0100 allow       tcp from any to any established
        0200 skipto 1000 tcp from any to any
        0300 allow       ip from any to any
        1000 allow       tcp from 1.2.3.4 to me 22
        1010 deny        tcp from any to me 22
        1020 allow       tcp from any to any

and not have to worry about the behaviour if dynamic interfaces configure
new IP numbers later on.

The check is semi expensive (traverses the interface address list)
so it should be protected as in the above example if high performance
is a requirement.
2001-02-13 14:12:37 +00:00
Luigi Rizzo
7e1cd0d23d Sync with the bridge/dummynet/ipfw code already tested in stable.
In ip_fw.[ch] change a couple of variable and field names to
avoid having types, variables and fields with the same name.
2001-02-10 00:10:18 +00:00
Luigi Rizzo
507b4b5432 MFS: bridge/ipfw/dummynet fixes (bridge.c will be committed separately) 2001-02-02 00:18:00 +00:00
Robert Watson
65450f2f77 o IPFW incorrectly handled filtering in the presence of previously
reserved and now allocated TCP flags in incoming packets.  This patch
  stops overloading those bits in the IP firewall rules, and moves
  colliding flags to a seperate field, ipflg.  The IPFW userland
  management tool, ipfw(8), is updated to reflect this change.  New TCP
  flags related to ECN are now included in tcp.h for reference, although
  we don't currently implement TCP+ECN.

o To use this fix without completely rebuilding, it is sufficient to copy
  ip_fw.h and tcp.h into your appropriate include directory, then rebuild
  the ipfw kernel module, and ipfw tool, and install both.  Note that a
  mismatch between module and userland tool will result in incorrect
  installation of firewall rules that may have unexpected effects.  This
  is an MFC candidate, following shakedown.  This bug does not appear
  to affect ipfilter.

Reviewed by:	security-officer, billf
Reported by:	Aragon Gouveia <aragon@phat.za.net>
2001-01-09 03:10:30 +00:00
Bill Fumerola
98b829924f Add new fields for more granularity:
IP: version, tos, ttl, len, id
	TCP: seq#, ack#, window size

Reviewed by:	silence on freebsd-{net,ipfw}
2000-10-02 03:03:31 +00:00
Archie Cobbs
11840b0692 Remove obsolete comment. 2000-08-22 00:32:52 +00:00
Dan Moschuk
9714563d83 Add tcpoptions to ipfw. This works much in the same way as ipoptions do.
It also squashes 99% of packet kiddie synflood orgies.  For example, to
rate syn packets without MSS,

ipfw pipe 10 config 56Kbit/s queue 10Packets
ipfw add pipe 10 tcp from any to any in setup tcpoptions !mss

Submitted by:  Richard A. Steenbergen <ras@e-gerbil.net>
2000-06-08 15:34:51 +00:00
Luigi Rizzo
5d3fe434f8 Implement WF2Q+ in dummynet. 2000-06-08 09:45:23 +00:00
Jake Burkholder
e39756439c Back out the previous change to the queue(3) interface.
It was not discussed and should probably not happen.

Requested by:		msmith and others
2000-05-26 02:09:24 +00:00
Jake Burkholder
740a1973a6 Change the way that the queue(3) structures are declared; don't assume that
the type argument to *_HEAD and *_ENTRY is a struct.

Suggested by:	phk
Reviewed by:	phk
Approved by:	mdodd
2000-05-23 20:41:01 +00:00
Luigi Rizzo
03c612662b Support for stateful (dynamic) ipfw rules. They are very
similar to ipfilter's keep-state.

Look at the updated ipfw(8) manpage for details.

Approved-by: jordan
2000-02-10 14:17:40 +00:00
Luigi Rizzo
ec8fac2acf Add ipfw hooks for the new dummynet features.
Support masks on TCP/UDP ports.

Minor cleanup of ip_fw_chk() to avoid repeated calls to PULLUP_TO
at each rule.
2000-01-08 11:31:43 +00:00
Peter Wemm
664a31e496 Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL"
is an application space macro and the applications are supposed to be free
to use it as they please (but cannot).  This is consistant with the other
BSD's who made this change quite some time ago.  More commits to come.
1999-12-29 04:46:21 +00:00
Archie Cobbs
8948e4ba8e Miscellaneous fixes/cleanups relating to ipfw and divert(4):
- Implement 'ipfw tee' (finally)
- Divert packets by calling new function divert_packet() directly instead
  of going through protosw[].
- Replace kludgey global variable 'ip_divert_port' with a function parameter
  to divert_packet()
- Replace kludgey global variable 'frag_divert_port' with a function parameter
  to ip_reass()
- style(9) fixes

Reviewed by:	julian, green
1999-12-06 00:43:07 +00:00
Peter Wemm
c3aac50f28 $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
Brian Feldman
4d1bb12d6c Correction: uid -> gid (comment) 1999-08-27 23:46:02 +00:00
Luigi Rizzo
772759420f Implement probabilistic rule match in ipfw. Each rule can be associated
with a match probability to achieve non-deterministic behaviour of
the firewall. This can be extremely useful for testing purposes
such as simulating random packet drop without having to use dummynet
(which already does the same thing), and simulating multipath effects
and the associated out-of-order delivery (this time in conjunction
with dummynet).

The overhead on normal rules is just one comparison with 0.

Since it would have been trivial to implement this by just adding
a field to the ip_fw structure, I decided to do it in a
backward-compatible way (i.e. struct ip_fw is unchanged, and as a
consequence you don't need to recompile ipfw if you don't want to
use this feature), since this was also useful for -STABLE.

When, at some point, someone decides to change struct ip_fw, please
add a length field and a version number at the beginning, so userland
apps can keep working even if they are out of sync with the kernel.
1999-08-11 15:34:47 +00:00
Brian Feldman
0b6c1a832d Make ipfw's logging more dynamic. Now, log will use the default limit
_or_ you may specify "log logamount number" to set logging specifically
the rule.
   In addition, "ipfw resetlog" has been added, which will reset the
logging counters on any/all rule(s). ipfw resetlog does not affect
the packet/byte counters (as ipfw reset does), and is the only "set"
command that can be run at securelevel >= 3.
   This should address complaints about not being able to set logging
amounts, not being able to restart logging at a high securelevel,
and not being able to just reset logging without resetting all of the
counters in a rule.
1999-08-01 16:57:24 +00:00
Brian Feldman
f8075bf9b3 Correct a really gross comment format. 1999-07-28 22:22:57 +00:00
Brian Feldman
7a2aab80b0 This is the much-awaited cleaned up version of IPFW [ug]id support.
All relevant changes have been made (including ipfw.8).
1999-06-19 18:43:33 +00:00
Peter Wemm
66e55756b5 Tidy up some stray / unused stuff in the IPFW package and friends.
- unifdef -DCOMPAT_IPFW  (this was on by default already)
- remove traces of in-kernel ip_nat package, it was never committed.
- Make IPFW and DUMMYNET initialize themselves rather than depend on
  compiled-in hooks in ip_init().  This means they initialize the same
  way both in-kernel and as kld modules.  (IPFW initializes now :-)
1999-04-20 13:32:06 +00:00
Luigi Rizzo
b715f178c6 Last bits (i think) of dummynet for -current. 1998-12-14 18:09:13 +00:00
Poul-Henning Kamp
67a895f650 Widen and change the layout of the IPFW structures flag element.
This will allow us to add dummynet to 3.0

Recompile /sbin/ipfw AND your kernel.
1998-09-02 19:14:01 +00:00
Garrett Wollman
cfe8b629f1 Yow! Completely change the way socket options are handled, eliminating
another specialized mbuf type in the process.  Also clean up some
of the cruft surrounding IPFW, multicast routing, RSVP, and other
ill-explored corners.
1998-08-23 03:07:17 +00:00
Julian Elischer
f9e354df42 Support for IPFW based transparent forwarding.
Any packet that can be matched by a ipfw rule can be redirected
transparently to another port or machine. Redirection to another port
mostly makes sense with tcp, where a session can be set up
between a proxy and an unsuspecting client. Redirection to another machine
requires that the other machine also be expecting to receive the forwarded
packets, as their headers will not have been modified.

/sbin/ipfw must be recompiled!!!

Reviewed by:	Peter Wemm <peter@freebsd.org>
Submitted by: Chrisy Luke <chrisy@flix.net>
1998-07-06 03:20:19 +00:00
Bruce Evans
e7a5897899 Added #include of <sys/queue.h> so that this file is more "self"-sufficent. 1998-02-03 22:19:35 +00:00
Alexander Langer
1c910ddbf9 Bump up packet and byte counters to 64-bit unsigned ints. As a
consequence, ipfw's list command now adjusts its output at runtime
based on the largest packet/byte counter values.

NOTE:
  o The ipfw struct has changed requiring a recompile of both kernel
    and userland ipfw utility.

  o This probably should not be brought into 2.2.

PR:		3738
1998-01-08 03:03:54 +00:00
Bruce Evans
55b211e3af Removed unused #includes. 1997-10-28 15:59:26 +00:00
Bruce Evans
514ede0953 Fixed gratuitous ANSIisms. 1997-09-16 11:44:05 +00:00
Alexander Langer
750f6aad7b Support interface names up to 15 characters in length. In order to
accommodate the expanded name, the ICMP types bitmap has been
reduced from 256 bits to 32.

A recompile of kernel and user level ipfw is required.

To be merged into 2.2 after a brief period in -current.

PR:		bin/4209
Reviewed by:	Archie Cobbs <archie@whistle.com>
1997-08-08 14:36:29 +00:00
Julian Elischer
e4676ba603 Submitted by: Whistle Communications (archie Cobbs)
these are quite extensive additions to the ipfw code.
they include a change to the API because the old method was
broken, but the user view is kept the same.

The new code allows a particular match to skip forward to a particular
line number, so that blocks of rules can be
used without checking all the intervening rules.
There are also many more ways of rejecting
connections especially TCP related, and
many many more ...

see the man page for a complete description.
1997-06-02 05:02:37 +00:00
Peter Wemm
6875d25465 Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not
ready for it yet.
1997-02-22 09:48:43 +00:00
Adam David
839cc09e53 implement "not" keyword for inverting the address logic 1997-01-16 21:04:29 +00:00
Jordan K. Hubbard
1130b656e5 Make the long-awaited change from $Id$ to $FreeBSD$
This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore.  This update would have been
insane otherwise.
1997-01-14 07:20:47 +00:00
Søren Schmidt
fed1c7e9e4 Add hooks for an IP NAT module, much like the firewall stuff...
Move the sockopt definitions for the firewall code from
ip_fw.h to in.h where it belongs.
1996-08-21 21:37:07 +00:00
Paul Traina
cc98643e68 Completely rewrite handling of protocol field for firewalls, things are
now completely consistent across all IP protocols and should be quite a
bit faster.

Discussed with: fenner & alex
1996-08-13 19:43:41 +00:00
Julian Elischer
93e0e11657 Adding changes to ipfw and the kernel to support ip packet diversion..
This stuff should not be too destructive if the IPDIVERT is not compiled in..
 be aware that this changes the size of the ip_fw struct
so ipfw needs to be recompiled to use it.. more changes coming to clean this up.
1996-07-10 19:44:30 +00:00
Alexander Langer
7a99108603 Big sweep over ipfw, picking up where Poul left off:
- Log ICMP type during verbose output.
  - Added IPFIREWALL_VERBOSE_LIMIT option to prevent denial of service
    attacks via syslog flooding.
  - Filter based on ICMP type.
  - Timestamp chain entries when they are matched.
  - Interfaces can now be matched with a wildcard specification (i.e.
    will match any interface unit for a given name).
  - Prevent the firewall chain from being manipulated when securelevel
    is greater than 2.
  - Fixed bug that allowed the default policy to be deleted.
  - Ability to zero individual accounting entries.
  - Remove definitions of old_chk_ptr and old_ctl_ptr when compiling
    ipfw as a lkm.
  - Remove some redundant code shared between ip_fw_init and ipfw_load.

Closes PRs: 1192, 1219, and 1267.
1996-06-09 23:46:21 +00:00
Gary Palmer
b750974745 Correct spelling error in comment 1996-06-02 00:15:19 +00:00
Poul-Henning Kamp
23bf99538c Add feature for tcp "established".
Change interface between netinet and ip_fw to be more general, and thus
hopefully also support other ip filtering implementations.
1996-04-03 13:52:20 +00:00
Poul-Henning Kamp
09bb5f7589 Make getsockopt() capable of handling more than one mbuf worth of data.
Use this to read rules out of ipfw.
Add the lkm code to ipfw.c
1996-02-24 13:38:28 +00:00
Poul-Henning Kamp
b83e431483 The new firewall functionality:
Filter on the direction (in/out).
	Filter on fragment/not fragment.
1996-02-24 00:17:35 +00:00