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* A new API function PacketAliasRedirectDynamic() can be usedru2003-06-013-1/+36
| | | | | to mark a fully specified static link as dynamic; i.e. make it a one-time link.
* Make the PacketAliasSetAddress() function call optional. If itru2003-06-012-11/+18
| | | | | | is not called, and no static rules match an outgoing packet, the latter retains its source IP address. This is in support of the "static NAT only" mode.
* style.Makefile(5)obrien2003-04-201-7/+6
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* Correct typos, mostly s/ a / an / where appropriate. Some whitespace cleanup,schweikh2003-01-012-2/+2
| | | | especially in troff files.
* Zap now-unused SHLIB_MINORpeter2002-09-281-1/+0
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* Don't forget to recalculate the IP checksum of the originalru2002-07-231-4/+12
| | | | | | | IP datagram embedded into ICMP error message. Spotted by: tcpdump 3.7.1 (-vvv) MFC after: 3 days
* Move IPFW2 definition before including ip_fw.hluigi2002-07-181-32/+30
| | | | Make indentation of new parts consistent with the style used for this file.
* Fix a bug caused by dereferencing an invalid pointer whenluigi2002-07-081-62/+65
| | | | | | | | | no punch_fw was used. Fix another couple of bugs which prevented rules from being installed properly. On passing, use IPFW2 instead of NEW_IPFW to compile the new code, and slightly simplify the instruction generation code.
* Remove trailing whitespacebrian2002-07-0110-142/+142
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* The new ipfw code.luigi2002-06-271-0/+118
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This code makes use of variable-size kernel representation of rules (exactly the same concept of BPF instructions, as used in the BSDI's firewall), which makes firewall operation a lot faster, and the code more readable and easier to extend and debug. The interface with the rest of the system is unchanged, as witnessed by this commit. The only extra kernel files that I am touching are if_fw.h and ip_dummynet.c, which is quite tied to ipfw. In userland I only had to touch those programs which manipulate the internal representation of firewall rules). The code is almost entirely new (and I believe I have written the vast majority of those sections which were taken from the former ip_fw.c), so rather than modifying the old ip_fw.c I decided to create a new file, sys/netinet/ip_fw2.c . Same for the user interface, which is in sbin/ipfw/ipfw2.c (it still compiles to /sbin/ipfw). The old files are still there, and will be removed in due time. I have not renamed the header file because it would have required touching a one-line change to a number of kernel files. In terms of user interface, the new "ipfw" is supposed to accepts the old syntax for ipfw rules (and produce the same output with "ipfw show". Only a couple of the old options (out of some 30 of them) has not been implemented, but they will be soon. On the other hand, the new code has some very powerful extensions. First, you can put "or" connectives between match fields (and soon also between options), and write things like ipfw add allow ip from { 1.2.3.4/27 or 5.6.7.8/30 } 10-23,25,1024-3000 to any This should make rulesets slightly more compact (and lines longer!), by condensing 2 or more of the old rules into single ones. Also, as an example of how easy the rules can be extended, I have implemented an 'address set' match pattern, where you can specify an IP address in a format like this: 10.20.30.0/26{18,44,33,22,9} which will match the set of hosts listed in braces belonging to the subnet 10.20.30.0/26 . The match is done using a bitmap, so it is essentially a constant time operation requiring a handful of CPU instructions (and a very small amount of memmory -- for a full /24 subnet, the instruction only consumes 40 bytes). Again, in this commit I have focused on functionality and tried to minimize changes to the other parts of the system. Some performance improvement can be achieved with minor changes to the interface of ip_fw_chk_t. This will be done later when this code is settled. The code is meant to compile unmodified on RELENG_4 (once the PACKET_TAG_* changes have been merged), for this reason you will see #ifdef __FreeBSD_version in a couple of places. This should minimize errors when (hopefully soon) it will be time to do the MFC.
* Avoid unintentional trigraph.wollman2002-05-301-1/+1
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* Fixed the bug in transparent TCP proxying with the "encode_ip_hdr"ru2001-12-181-1/+3
| | | | | | option -- TcpAliasOut() did not catch the IP header length change. Submitted by: Stepachev Andrey <aka50@mail.ru>
* When servicing an internal FTP server, punch ipfirewall(4) holesru2001-11-271-5/+2
| | | | | | | | | for passive mode data connections (PASV/EPSV -> 227/229). Well, the actual punching happens a bit later, when the aliasing link becomes fully specified. Prodded by: Danny Carroll <dannycarroll@hotmail.com> MFC after: 1 week
* cmott@scientech.com -> cm@linktel.netbrian2001-11-039-10/+10
| | | | Requested by: Charles Mott <cmott@scientech.com>
* mdoc(7) police: Use the new .In macro for #include statements.ru2001-10-011-3/+3
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* Add __FBSDID's to libaliasdillon2001-09-3010-21/+32
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* Fixed the bug that prevented communication with FTP servers behindru2001-09-211-3/+4
| | | | | | | | | | | | | | | NAT in extended passive mode if the server's public IP address was different from the main NAT address. This caused a wrong aliasing link to be created that did not route the incoming packets back to the original IP address of the server. natd -v -n pub0 -redirect_address localFTP publicFTP Note that even if localFTP == publicFTP, one still needs to supply the -redirect_address directive. It is needed as a helper because extended passive mode's 229 reply does not contain the IP address. MFC after: 1 week
* Added TFTP support.ru2001-08-211-0/+9
| | | | | Submitted by: Joe Clarke <marcus@marcuscom.com> MFC after: 2 weeks
* Close the "IRC DCC" security breach reported recently on Bugtraq.ru2001-08-211-0/+6
| | | | Submitted by: Makoto MATSUSHITA <matusita@jp.FreeBSD.org>
* Make the copyright consistent.brian2001-08-204-12/+0
| | | | Previously approved by: Charles Mott <cmott@scientech.com>
* Handle snprintf() returning -1brian2001-08-201-3/+13
| | | | MFC after: 2 weeks
* mdoc(7) police:ru2001-08-071-4/+2
| | | | | | | Avoid using parenthesis enclosure macros (.Pq and .Po/.Pc) with plain text. Not only this slows down the mdoc(7) processing significantly, but it also has an undesired (in this case) effect of disabling hyphenation within the entire enclosed block.
* mdoc(7) police: removed HISTORY info from the .Os call.ru2001-07-101-1/+1
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* Fixed the brain-o in rev. 1.10: the logic check was reversed.ru2001-06-271-1/+1
| | | | Reported by: Bernd Fuerwitt <bf@fuerwitt.de>
* Add BSD-style copyright headersbrian2001-06-049-17/+253
| | | | Approved by: Charles Mott <cmott@scientech.com>
* Change to a standard BSD-style copyrightbrian2001-06-041-13/+22
| | | | Approved by: Atsushi Murai <amurai@spec.co.jp>
* Add an integer field to keep protocol-specific flags with links.ru2001-05-303-15/+20
| | | | | | | | | | For FTP control connection, keep the CRLF end-of-line termination status in there. Fixed the bug when the first FTP command in a session was ignored. PR: 24048 MFC after: 1 week
* MAN[1-9] -> MAN.ru2001-03-271-1/+1
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* Make header files conform to style(9).brian2001-03-256-326/+311
| | | | | | Reviewed by (*): bde (*) alias_local.h only got a cursory glance.
* Remove an extraneous declaration.brian2001-03-251-1/+0
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* Remove (non-protected) variable names from function prototypes.brian2001-03-221-7/+5
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* Add a few ``const''s to silence some -Wwrite-strings warningsbrian2001-01-291-7/+9
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* Ignore leading witespace in the string given to PacketAliasProxyRule().brian2001-01-291-0/+1
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* mdoc(7) police: use the new feature of the An macro.ru2000-11-221-24/+14
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* Added boolean argument to link searching functions, indicatingru2000-10-307-107/+42
| | | | whether they should create a link if lookup has failed or not.
* A significant rewrite of PPTP aliasing code.ru2000-10-304-151/+265
| | | | | | | | | | | | | | PPTP links are no longer dropped by simple (and inappropriate in this case) "inactivity timeout" procedure, only when requested through the control connection. It is now possible to have multiple PPTP servers running behind NAT. Just redirect the incoming TCP traffic to port 1723, everything else is done transparently. Problems were reported and the fix was tested by: Michael Adler <Michael.Adler@compaq.com>, David Andersen <dga@lcs.mit.edu>
* A failure to allocate memory for auxiliary TCP data is now fatal.ru2000-10-191-16/+15
| | | | | This fixes a null pointer dereference problem that is unlikely to happen in normal circumstances.
* A bit of indentation reformatting.ru2000-10-021-33/+21
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* Fixed the calculations with UDP header length field.ru2000-09-211-2/+2
| | | | | | | The field is in network byte order and contains the size of the header. Reviewed by: brian
* Add -Wmissing-prototypes.ru2000-09-152-5/+8
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* Match IPPROTO_ICMP with IP protocol field of the original IPru2000-09-011-2/+2
| | | | | | | datagram embedded into ICMP error message, not with protocol field of ICMP message itself (which is always IPPROTO_ICMP). Pointed by: Erik Salander <erik@whistle.com>
* Changed the way we handle outgoing ICMP error messages -- doru2000-09-011-12/+22
| | | | | | | | not alias `ip_src' unless it comes from the host an original datagram that triggered this error message was destined for. PR: 20712 Reviewed by: brian, Charles Mott <cmott@scientech.com>
* Grab ADJUST_CHECKSUM() macro from alias_local.h.ru2000-08-311-17/+0
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* Create aliasing links for incoming ICMP echo/timestamp requests.ru2000-08-312-47/+24
| | | | | This makes outgoing ICMP echo/timestamp replies to be de-aliased with the right source IP, not exactly the primary aliasing IP.
* strtok -> strsep (no strtok allowed in libraries)ache2000-08-291-3/+6
| | | | add unsigned char cast to ctype macro
* Fixed PunchFW code segmentation violation bug.ru2000-08-141-5/+4
| | | | Reported by: Christian Schade <chris@cube.sax.de>
* Use queue(3) LIST_* macros for doubly-linked lists.ru2000-08-141-65/+18
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* - Do not modify Peer's Call ID in outgoing Incoming-Call-Connectedru2000-08-091-18/+25
| | | | | | | | PPTP control messages. - Cosmetics: replace `GRE link' with `PPTP link'. Reviewed by: Erik Salander <erik@whistle.com>
* Adjust TCP checksum rather than compute it afresh.ru2000-08-071-4/+8
| | | | Submitted by: Erik Salander <erik@whistle.com>
* Whitespace only:sheldonh2000-07-311-4/+4
| | | | | Fix an overlong line and trailing whitespace that crept in, in the previous commit.
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