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Import tayga 0.9.2 (downloaded 2019-02-14) 

Signed-off-by: Nico Schottelius <nico@nico-notebook.schottelius.org>
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Nico Schottelius 2019-02-14 12:37:08 +01:00
commit 1c43cef4e5
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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your
freedom to share and change it. By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users. This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it. (Some other Free Software Foundation software is covered by
the GNU Library General Public License instead.) You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
in new free programs; and that you know you can do these things.
To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if you
distribute copies of the software, or if you modify it.
For example, if you distribute copies of such a program, whether
gratis or for a fee, you must give the recipients all the rights that
you have. You must make sure that they, too, receive or can get the
source code. And you must show them these terms so they know their
rights.
We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
distribute and/or modify the software.
Also, for each author's protection and ours, we want to make certain
that everyone understands that there is no warranty for this free
software. If the software is modified by someone else and passed on, we
want its recipients to know that what they have is not the original, so
that any problems introduced by others will not reflect on the original
authors' reputations.
Finally, any free program is threatened constantly by software
patents. We wish to avoid the danger that redistributors of a free
program will individually obtain patent licenses, in effect making the
program proprietary. To prevent this, we have made it clear that any
patent must be licensed for everyone's free use or not licensed at all.
The precise terms and conditions for copying, distribution and
modification follow.
GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License. The "Program", below,
refers to any such program or work, and a "work based on the Program"
means either the Program or any derivative work under copyright law:
that is to say, a work containing the Program or a portion of it,
either verbatim or with modifications and/or translated into another
language. (Hereinafter, translation is included without limitation in
the term "modification".) Each licensee is addressed as "you".
Activities other than copying, distribution and modification are not
covered by this License; they are outside its scope. The act of
running the Program is not restricted, and the output from the Program
is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program).
Whether that is true depends on what the Program does.
1. You may copy and distribute verbatim copies of the Program's
source code as you receive it, in any medium, provided that you
conspicuously and appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep intact all the
notices that refer to this License and to the absence of any warranty;
and give any other recipients of the Program a copy of this License
along with the Program.
You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.
2. You may modify your copy or copies of the Program or any portion
of it, thus forming a work based on the Program, and copy and
distribute such modifications or work under the terms of Section 1
above, provided that you also meet all of these conditions:
a) You must cause the modified files to carry prominent notices
stating that you changed the files and the date of any change.
b) You must cause any work that you distribute or publish, that in
whole or in part contains or is derived from the Program or any
part thereof, to be licensed as a whole at no charge to all third
parties under the terms of this License.
c) If the modified program normally reads commands interactively
when run, you must cause it, when started running for such
interactive use in the most ordinary way, to print or display an
announcement including an appropriate copyright notice and a
notice that there is no warranty (or else, saying that you provide
a warranty) and that users may redistribute the program under
these conditions, and telling the user how to view a copy of this
License. (Exception: if the Program itself is interactive but
does not normally print such an announcement, your work based on
the Program is not required to print an announcement.)
These requirements apply to the modified work as a whole. If
identifiable sections of that work are not derived from the Program,
and can be reasonably considered independent and separate works in
themselves, then this License, and its terms, do not apply to those
sections when you distribute them as separate works. But when you
distribute the same sections as part of a whole which is a work based
on the Program, the distribution of the whole must be on the terms of
this License, whose permissions for other licensees extend to the
entire whole, and thus to each and every part regardless of who wrote it.
Thus, it is not the intent of this section to claim rights or contest
your rights to work written entirely by you; rather, the intent is to
exercise the right to control the distribution of derivative or
collective works based on the Program.
In addition, mere aggregation of another work not based on the Program
with the Program (or with a work based on the Program) on a volume of
a storage or distribution medium does not bring the other work under
the scope of this License.
3. You may copy and distribute the Program (or a work based on it,
under Section 2) in object code or executable form under the terms of
Sections 1 and 2 above provided that you also do one of the following:
a) Accompany it with the complete corresponding machine-readable
source code, which must be distributed under the terms of Sections
1 and 2 above on a medium customarily used for software interchange; or,
b) Accompany it with a written offer, valid for at least three
years, to give any third party, for a charge no more than your
cost of physically performing source distribution, a complete
machine-readable copy of the corresponding source code, to be
distributed under the terms of Sections 1 and 2 above on a medium
customarily used for software interchange; or,
c) Accompany it with the information you received as to the offer
to distribute corresponding source code. (This alternative is
allowed only for noncommercial distribution and only if you
received the program in object code or executable form with such
an offer, in accord with Subsection b above.)
The source code for a work means the preferred form of the work for
making modifications to it. For an executable work, complete source
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associated interface definition files, plus the scripts used to
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anything that is normally distributed (in either source or binary
form) with the major components (compiler, kernel, and so on) of the
operating system on which the executable runs, unless that component
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If distribution of executable or object code is made by offering
access to copy from a designated place, then offering equivalent
access to copy the source code from the same place counts as
distribution of the source code, even though third parties are not
compelled to copy the source along with the object code.
4. You may not copy, modify, sublicense, or distribute the Program
except as expressly provided under this License. Any attempt
otherwise to copy, modify, sublicense or distribute the Program is
void, and will automatically terminate your rights under this License.
However, parties who have received copies, or rights, from you under
this License will not have their licenses terminated so long as such
parties remain in full compliance.
5. You are not required to accept this License, since you have not
signed it. However, nothing else grants you permission to modify or
distribute the Program or its derivative works. These actions are
prohibited by law if you do not accept this License. Therefore, by
modifying or distributing the Program (or any work based on the
Program), you indicate your acceptance of this License to do so, and
all its terms and conditions for copying, distributing or modifying
the Program or works based on it.
6. Each time you redistribute the Program (or any work based on the
Program), the recipient automatically receives a license from the
original licensor to copy, distribute or modify the Program subject to
these terms and conditions. You may not impose any further
restrictions on the recipients' exercise of the rights granted herein.
You are not responsible for enforcing compliance by third parties to
this License.
7. If, as a consequence of a court judgment or allegation of patent
infringement or for any other reason (not limited to patent issues),
conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot
distribute so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you
may not distribute the Program at all. For example, if a patent
license would not permit royalty-free redistribution of the Program by
all those who receive copies directly or indirectly through you, then
the only way you could satisfy both it and this License would be to
refrain entirely from distribution of the Program.
If any portion of this section is held invalid or unenforceable under
any particular circumstance, the balance of the section is intended to
apply and the section as a whole is intended to apply in other
circumstances.
It is not the purpose of this section to induce you to infringe any
patents or other property right claims or to contest validity of any
such claims; this section has the sole purpose of protecting the
integrity of the free software distribution system, which is
implemented by public license practices. Many people have made
generous contributions to the wide range of software distributed
through that system in reliance on consistent application of that
system; it is up to the author/donor to decide if he or she is willing
to distribute software through any other system and a licensee cannot
impose that choice.
This section is intended to make thoroughly clear what is believed to
be a consequence of the rest of this License.
8. If the distribution and/or use of the Program is restricted in
certain countries either by patents or by copyrighted interfaces, the
original copyright holder who places the Program under this License
may add an explicit geographical distribution limitation excluding
those countries, so that distribution is permitted only in or among
countries not thus excluded. In such case, this License incorporates
the limitation as if written in the body of this License.
9. The Free Software Foundation may publish revised and/or new versions
of the General Public License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the Program
specifies a version number of this License which applies to it and "any
later version", you have the option of following the terms and conditions
either of that version or of any later version published by the Free
Software Foundation. If the Program does not specify a version number of
this License, you may choose any version ever published by the Free Software
Foundation.
10. If you wish to incorporate parts of the Program into other free
programs whose distribution conditions are different, write to the author
to ask for permission. For software which is copyrighted by the Free
Software Foundation, write to the Free Software Foundation; we sometimes
make exceptions for this. Our decision will be guided by the two goals
of preserving the free status of all derivatives of our free software and
of promoting the sharing and reuse of software generally.
NO WARRANTY
11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
REPAIR OR CORRECTION.
12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:
Gnomovision version 69, Copyright (C) year name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, the commands you use may
be called something other than `show w' and `show c'; they could even be
mouse-clicks or menu items--whatever suits your program.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Library General
Public License instead of this License.

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README Normal file
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@ -0,0 +1,169 @@
******************************************************************************
README for TAYGA v0.9.2
******************************************************************************
Last updated 2010-12-12
--------
Overview
--------
TAYGA is an out-of-kernel stateless NAT64 implementation for Linux. It uses
the TUN driver to exchange packets with the kernel, which is the same driver
used by OpenVPN and QEMU/KVM. TAYGA needs no kernel patches or out-of-tree
modules, and it is compatible with all 2.4 and 2.6 kernels.
If you're impatient and you know what stateless NAT64 is, you can skip to the
Installation & Basic Configuration section.
-------------------------------
Stateless versus Stateful NAT64
-------------------------------
Most people are familiar with stateful NAT, which allows N:1 address mapping
by tracking TCP and UDP sessions and rewriting port numbers on each packet.
Most commonly this is used to translate sessions from multiple "internal"
hosts (which are numbered with private IPv4 addresses) onto a single global
IPv4 address on the NAT device's "external" interface.
Stateless NAT does no such session tracking or port number rewriting. It
simply performs a 1:1 substitution of IP addresses using a mapping table
provided by the network administrator. For example, an organization whose
global address allocation was 198.51.100.0/24 but whose hosts were using
addresses in 192.0.2.0/24 could use a stateless NAT to rewrite 192.0.2.1 into
198.51.100.1, 192.0.2.35 into 198.51.100.35, etc, in the outbound direction,
and the reverse in the inbound direction. This is commonly done when an
organization moves to a new ISP and receives a new IPv4 address delegation of
the same size as their old delegation but does not want to renumber their
network.
TAYGA and other stateless NAT64 translators operate in this fashion. When
translating packets between IPv4 and IPv6, the source and destination
addresses in the packet headers are substituted using a 1:1 mapping. This
means that, in order to exchange packets across the NAT64, each IPv4 host must
be represented by a unique IPv6 address, and each IPv6 host must be
represented by a unique IPv4 address. How this mapping is performed is
discussed in the next sections.
In situations where stateful NAT64 is required, TAYGA can be used in
combination with a stateful IPv4 NAT such as the iptables MASQUERADE target.
This allows the administrator a great deal more flexibility than if stateful
NAT were implemented directly in TAYGA.
----------------------
Mapping IPv4 into IPv6
----------------------
TAYGA maps IPv4 addresses into the IPv6 network according to RFC 6052. This
states that a 32-bit IPv4 address should be appended to a designated IPv6
prefix, which we call the NAT64 prefix, and the resulting IPv6 address can be
used to contact the IPv4 host through the NAT64.
The NAT64 prefix should be assigned out of a site's global IPv6 address
allocation. For example, if a site is allocated 2001:db8:1::/48, the prefix
2001:db8:1:ffff::/96 could be set aside for NAT64. (There are several options
for the length of the NAT64 prefix, but a /96 is recommended.) The IPv4 host
198.51.100.10 could then be accessed through the NAT64 using the address
2001:db8:1:ffff::c633:640a. Conveniently, it is possible to use the syntax
2001:db8:1:ffff::198.51.100.10 instead.
RFC 6052 also specifies a Well-Known Prefix 64:ff9b::/96 which can be used for
NAT64 service rather than allocating a prefix from the site's IPv6 address
block. However, this comes with several restrictions, primarily that hosts
with private IPv4 addresses (10.x.x.x, 192.168.x.x, etc) cannot be accessed
through the NAT64. See RFC 6052 for more information.
If NAT64 service is needed for only a few hosts instead of the entire IPv4
address space, TAYGA can be configured without a NAT64 prefix, and address
maps can be assigned on a host-by-host basis.
----------------------
Mapping IPv6 into IPv4
----------------------
Being a stateless NAT, TAYGA requires that a unique IPv4 address is assigned
to every IPv6 host that needs NAT64 service. This assignment can be done
statically by the network administrator, or dynamically by TAYGA from a pool
of IPv4 addresses designated for this purpose.
Static address mapping is desirable for servers or other hosts requiring a
well-known address. Statically mapped addresses may be entered into DNS, for
example.
Dynamic address mapping allows TAYGA to assign IPv4 addresses to IPv6 hosts as
they are needed. By default, these assignments are guaranteed to remain
usable for up to two hours after the last packet seen, but they are retained
for up to two weeks as long as the address pool does not become empty.
Assignments are written to disk so they persist through a restart of the TAYGA
daemon, allowing existing TCP and UDP sessions to continue uninterrupted.
(Of course, TAYGA also supports the addressing architecture described in RFC
6052 in which IPv6 hosts are numbered with "IPv4-translatable IPv6 addresses"
carved out of the NAT64 prefix.)
----------------------------------
Installation & Basic Configuration
----------------------------------
TAYGA uses the GNU Automake/Autoconf system, which requires the `configure`
script to be run to generate the Makefile prior to building. The --prefix
and/or --sysconfdir options can be specified to the configure script to
specify the top-level installation path and tayga.conf file directory,
respectively.
After unpacking the distribution tar.bz2 file, run:
# ./configure && make && make install
This will install the tayga executable in /usr/local/sbin/tayga and the sample
config file in /usr/local/etc/tayga.conf.example.
Next, if you would like dynamic maps to be persistent between TAYGA restarts,
create a directory to store the dynamic.map file:
# mkdir -p /var/db/tayga
Now create your site-specific tayga.conf configuration file. The installed
tayga.conf.example file can be copied to tayga.conf and modified to suit your
site. Here is a sample minimal configuration:
tun-device nat64
ipv4-addr 192.168.255.1
prefix 2001:db8:1:ffff::/96 # replace with a prefix from
# your site's address range
dynamic-pool 192.168.255.0/24
data-dir /var/db/tayga # omit if you do not need persistent
# dynamic address maps
Before starting the TAYGA daemon, the routing setup on your system will need
to be changed to send IPv4 and IPv6 packets to TAYGA. First create the TUN
network interface:
# tayga --mktun
If TAYGA prints any errors, you will need to fix your config file before
continuing. Otherwise, the new nat64 interface can be configured and the
proper routes can be added to your system:
# ip link set nat64 up
# ip addr add 2001:db8:1::1 dev nat64 # replace with your router's address
# ip addr add 192.168.0.1 dev nat64 # replace with your router's address
# ip route add 2001:db8:1:ffff::/96 dev nat64 # from tayga.conf
# ip route add 192.168.255.0/24 dev nat64 # from tayga.conf
Firewalling your NAT64 prefix from outside access is highly recommended:
# ip6tables -A FORWARD -s 2001:db8:1::/48 -d 2001:db8:1:ffff::/96 -j ACCEPT
# ip6tables -A FORWARD -d 2001:db8:1:ffff::/96 -j DROP
At this point, you may start the tayga process:
# tayga
Check your system log (/var/log/syslog or /var/log/messages) for status
information.
If you are having difficulty configuring TAYGA, use the -d option to run the
tayga process in the foreground and send all log messages to stdout:
# tayga -d

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631
addrmap.c Normal file
View File

@ -0,0 +1,631 @@
/*
* addrmap.c -- address mapping routines
*
* part of TAYGA <http://www.litech.org/tayga/>
* Copyright (C) 2010 Nathan Lutchansky <lutchann@litech.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <tayga.h>
extern struct config *gcfg;
extern time_t now;
int validate_ip4_addr(const struct in_addr *a)
{
/* First octet == 0 */
if (!(a->s_addr & htonl(0xff000000)))
return -1;
/* First octet == 127 */
if ((a->s_addr & htonl(0xff000000)) == htonl(0x7f000000))
return -1;
/* Link-local block 169.254.0.0/16 */
if ((a->s_addr & htonl(0xffff0000)) == htonl(0xa9fe0000))
return -1;
/* Class D & E */
if ((a->s_addr & htonl(0xe0000000)) == htonl(0xe0000000))
return -1;
return 0;
}
int validate_ip6_addr(const struct in6_addr *a)
{
/* Well-known prefix for NAT64 */
if (a->s6_addr32[0] == WKPF && !a->s6_addr32[1] && !a->s6_addr32[2])
return 0;
/* Reserved per RFC 2373 */
if (!a->s6_addr[0])
return -1;
/* Multicast addresses */
if (a->s6_addr[0] == 0xff)
return -1;
/* Link-local unicast addresses */
if ((a->s6_addr16[0] & htons(0xffc0)) == htons(0xfe80))
return -1;
return 0;
}
int is_private_ip4_addr(const struct in_addr *a)
{
/* 10.0.0.0/8 */
if ((a->s_addr & htonl(0xff000000)) == htonl(0x0a000000))
return -1;
/* 172.16.0.0/12 */
if ((a->s_addr & htonl(0xfff00000)) == htonl(0xac100000))
return -1;
/* 192.0.2.0/24 */
if ((a->s_addr & htonl(0xffffff00)) == htonl(0xc0000200))
return -1;
/* 192.168.0.0/16 */
if ((a->s_addr & htonl(0xffff0000)) == htonl(0xc0a80000))
return -1;
/* 198.18.0.0/15 */
if ((a->s_addr & htonl(0xfffe0000)) == htonl(0xc6120000))
return -1;
/* 198.51.100.0/24 */
if ((a->s_addr & htonl(0xffffff00)) == htonl(0xc6336400))
return -1;
/* 203.0.113.0/24 */
if ((a->s_addr & htonl(0xffffff00)) == htonl(0xcb007100))
return -1;
return 0;
}
int calc_ip4_mask(struct in_addr *mask, const struct in_addr *addr, int len)
{
mask->s_addr = htonl(~((1 << (32 - len)) - 1));
if (addr && (addr->s_addr & ~mask->s_addr))
return -1;
return 0;
}
int calc_ip6_mask(struct in6_addr *mask, const struct in6_addr *addr, int len)
{
if (len > 32) {
mask->s6_addr32[0] = ~0;
if (len > 64) {
mask->s6_addr32[1] = ~0;
if (len > 96) {
mask->s6_addr32[2] = ~0;
mask->s6_addr32[3] =
htonl(~((1 << (128 - len)) - 1));
} else {
mask->s6_addr32[2] =
htonl(~((1 << (96 - len)) - 1));
mask->s6_addr32[3] = 0;
}
} else {
mask->s6_addr32[1] = htonl(~((1 << (64 - len)) - 1));
mask->s6_addr32[2] = 0;
mask->s6_addr32[3] = 0;
}
} else {
mask->s6_addr32[0] = htonl(~((1 << (32 - len)) - 1));
mask->s6_addr32[1] = 0;
mask->s6_addr32[2] = 0;
mask->s6_addr32[3] = 0;
}
if (!addr)
return 0;
if ((addr->s6_addr32[0] & ~mask->s6_addr32[0]) ||
(addr->s6_addr32[1] & ~mask->s6_addr32[1]) ||
(addr->s6_addr32[2] & ~mask->s6_addr32[2]) ||
(addr->s6_addr32[3] & ~mask->s6_addr32[3]))
return -1;
return 0;
}
static uint32_t hash_ip4(const struct in_addr *addr4)
{
return ((uint32_t)(addr4->s_addr *
gcfg->rand[0])) >> (32 - gcfg->hash_bits);
}
static uint32_t hash_ip6(const struct in6_addr *addr6)
{
uint32_t h;
h = ((uint32_t)addr6->s6_addr16[0] + gcfg->rand[0]) *
((uint32_t)addr6->s6_addr16[1] + gcfg->rand[1]);
h ^= ((uint32_t)addr6->s6_addr16[2] + gcfg->rand[2]) *
((uint32_t)addr6->s6_addr16[3] + gcfg->rand[3]);
h ^= ((uint32_t)addr6->s6_addr16[4] + gcfg->rand[4]) *
((uint32_t)addr6->s6_addr16[5] + gcfg->rand[5]);
h ^= ((uint32_t)addr6->s6_addr16[6] + gcfg->rand[6]) *
((uint32_t)addr6->s6_addr16[7] + gcfg->rand[7]);
return h >> (32 - gcfg->hash_bits);
}
static void add_to_hash_table(struct cache_entry *c, uint32_t hash4,
uint32_t hash6)
{
list_add(&c->hash4, &gcfg->hash_table4[hash4]);
list_add(&c->hash6, &gcfg->hash_table6[hash6]);
}
void create_cache(void)
{
int i, hash_size = 1 << gcfg->hash_bits;
struct list_head *entry;
struct cache_entry *c;
if (gcfg->hash_table4) {
free(gcfg->hash_table4);
free(gcfg->hash_table6);
}
gcfg->hash_table4 = (struct list_head *)
malloc(hash_size * sizeof(struct list_head));
gcfg->hash_table6 = (struct list_head *)
malloc(hash_size * sizeof(struct list_head));
if (!gcfg->hash_table4 || !gcfg->hash_table6) {
slog(LOG_CRIT, "unable to allocate %d bytes for hash table\n",
hash_size * sizeof(struct list_head));
exit(1);
}
for (i = 0; i < hash_size; ++i) {
INIT_LIST_HEAD(&gcfg->hash_table4[i]);
INIT_LIST_HEAD(&gcfg->hash_table6[i]);
}
if (list_empty(&gcfg->cache_pool) && list_empty(&gcfg->cache_active)) {
c = calloc(gcfg->cache_size, sizeof(struct cache_entry));
for (i = 0; i < gcfg->cache_size; ++i) {
INIT_LIST_HEAD(&c->list);
INIT_LIST_HEAD(&c->hash4);
INIT_LIST_HEAD(&c->hash6);
list_add_tail(&c->list, &gcfg->cache_pool);
++c;
}
} else {
list_for_each(entry, &gcfg->cache_active) {
c = list_entry(entry, struct cache_entry, list);
INIT_LIST_HEAD(&c->hash4);
INIT_LIST_HEAD(&c->hash6);
add_to_hash_table(c, hash_ip4(&c->addr4),
hash_ip6(&c->addr6));
}
}
}
static struct cache_entry *cache_insert(const struct in_addr *addr4,
const struct in6_addr *addr6,
uint32_t hash4, uint32_t hash6)
{
struct cache_entry *c;
if (list_empty(&gcfg->cache_pool))
return NULL;
c = list_entry(gcfg->cache_pool.next, struct cache_entry, list);
c->addr4 = *addr4;
c->addr6 = *addr6;
c->last_use = now;
c->flags = 0;
c->ip4_ident = 1;
list_add(&c->list, &gcfg->cache_active);
add_to_hash_table(c, hash4, hash6);
return c;
}
struct map4 *find_map4(const struct in_addr *addr4)
{
struct list_head *entry;
struct map4 *m;
list_for_each(entry, &gcfg->map4_list) {
m = list_entry(entry, struct map4, list);
if (m->addr.s_addr == (m->mask.s_addr & addr4->s_addr))
return m;
}
return NULL;
}
struct map6 *find_map6(const struct in6_addr *addr6)
{
struct list_head *entry;
struct map6 *m;
list_for_each(entry, &gcfg->map6_list) {
m = list_entry(entry, struct map6, list);
if (IN6_IS_IN_NET(addr6, &m->addr, &m->mask))
return m;
}
return NULL;
}
int insert_map4(struct map4 *m, struct map4 **conflict)
{
struct list_head *entry;
struct map4 *s;
list_for_each(entry, &gcfg->map4_list) {
s = list_entry(entry, struct map4, list);
if (s->prefix_len < m->prefix_len)
break;
if (s->prefix_len == m->prefix_len &&
s->addr.s_addr == m->addr.s_addr)
goto conflict;
}
list_add_tail(&m->list, entry);
return 0;
conflict:
if (conflict)
*conflict = s;
return -1;
}
int insert_map6(struct map6 *m, struct map6 **conflict)
{
struct list_head *entry, *insert_pos = NULL;
struct map6 *s;
list_for_each(entry, &gcfg->map6_list) {
s = list_entry(entry, struct map6, list);
if (s->prefix_len < m->prefix_len) {
if (IN6_IS_IN_NET(&m->addr, &s->addr, &s->mask))
goto conflict;
if (!insert_pos)
insert_pos = entry;
} else {
if (IN6_IS_IN_NET(&s->addr, &m->addr, &m->mask))
goto conflict;
}
}
list_add_tail(&m->list, insert_pos ? insert_pos : &gcfg->map6_list);
return 0;
conflict:
if (conflict)
*conflict = s;
return -1;
}
int append_to_prefix(struct in6_addr *addr6, const struct in_addr *addr4,
const struct in6_addr *prefix, int prefix_len)
{
switch (prefix_len) {
case 32:
addr6->s6_addr32[0] = prefix->s6_addr32[0];
addr6->s6_addr32[1] = addr4->s_addr;
addr6->s6_addr32[2] = 0;
addr6->s6_addr32[3] = 0;
return 0;
case 40:
addr6->s6_addr32[0] = prefix->s6_addr32[0];
#if __BYTE_ORDER == __BIG_ENDIAN
addr6->s6_addr32[1] = prefix->s6_addr32[1] |
(addr4->s_addr >> 8);
addr6->s6_addr32[2] = (addr4->s_addr << 16) & 0x00ff0000;
#else
# if __BYTE_ORDER == __LITTLE_ENDIAN
addr6->s6_addr32[1] = prefix->s6_addr32[1] |
(addr4->s_addr << 8);
addr6->s6_addr32[2] = (addr4->s_addr >> 16) & 0x0000ff00;
# endif
#endif
addr6->s6_addr32[3] = 0;
return 0;
case 48:
addr6->s6_addr32[0] = prefix->s6_addr32[0];
#if __BYTE_ORDER == __BIG_ENDIAN
addr6->s6_addr32[1] = prefix->s6_addr32[1] |
(addr4->s_addr >> 16);
addr6->s6_addr32[2] = (addr4->s_addr << 8) & 0x00ffff00;
#else
# if __BYTE_ORDER == __LITTLE_ENDIAN
addr6->s6_addr32[1] = prefix->s6_addr32[1] |
(addr4->s_addr << 16);
addr6->s6_addr32[2] = (addr4->s_addr >> 8) & 0x00ffff00;
# endif
#endif
addr6->s6_addr32[3] = 0;
return 0;
case 56:
addr6->s6_addr32[0] = prefix->s6_addr32[0];
#if __BYTE_ORDER == __BIG_ENDIAN
addr6->s6_addr32[1] = prefix->s6_addr32[1] |
(addr4->s_addr >> 24);
addr6->s6_addr32[2] = addr4->s_addr & 0x00ffffff;
#else
# if __BYTE_ORDER == __LITTLE_ENDIAN
addr6->s6_addr32[1] = prefix->s6_addr32[1] |
(addr4->s_addr << 24);
addr6->s6_addr32[2] = addr4->s_addr & 0xffffff00;
# endif
#endif
addr6->s6_addr32[3] = 0;
return 0;
case 64:
addr6->s6_addr32[0] = prefix->s6_addr32[0];
addr6->s6_addr32[1] = prefix->s6_addr32[1];
#if __BYTE_ORDER == __BIG_ENDIAN
addr6->s6_addr32[2] = addr4->s_addr >> 8;
addr6->s6_addr32[3] = addr4->s_addr << 24;
#else
# if __BYTE_ORDER == __LITTLE_ENDIAN
addr6->s6_addr32[2] = addr4->s_addr << 8;
addr6->s6_addr32[3] = addr4->s_addr >> 24;
# endif
#endif
return 0;
case 96:
if (prefix->s6_addr32[0] == WKPF &&
is_private_ip4_addr(addr4))
return -1;
addr6->s6_addr32[0] = prefix->s6_addr32[0];
addr6->s6_addr32[1] = prefix->s6_addr32[1];
addr6->s6_addr32[2] = prefix->s6_addr32[2];
addr6->s6_addr32[3] = addr4->s_addr;
return 0;
default:
return -1;
}
}
int map_ip4_to_ip6(struct in6_addr *addr6, const struct in_addr *addr4,
struct cache_entry **c_ptr)
{
uint32_t hash;
struct list_head *entry;
struct cache_entry *c;
struct map4 *map4;
struct map_static *s;
struct map_dynamic *d = NULL;
if (gcfg->cache_size) {
hash = hash_ip4(addr4);
list_for_each(entry, &gcfg->hash_table4[hash]) {
c = list_entry(entry, struct cache_entry, hash4);
if (addr4->s_addr == c->addr4.s_addr) {
*addr6 = c->addr6;
c->last_use = now;
if (c_ptr)
*c_ptr = c;
return 0;
}
}
}
map4 = find_map4(addr4);
if (!map4)
return -1;
switch (map4->type) {
case MAP_TYPE_STATIC:
s = container_of(map4, struct map_static, map4);
*addr6 = s->map6.addr;
break;
case MAP_TYPE_RFC6052:
s = container_of(map4, struct map_static, map4);
if (append_to_prefix(addr6, addr4, &s->map6.addr,
s->map6.prefix_len) < 0)
return -1;
break;
case MAP_TYPE_DYNAMIC_POOL:
return -1;
case MAP_TYPE_DYNAMIC_HOST:
d = container_of(map4, struct map_dynamic, map4);
*addr6 = d->map6.addr;
d->last_use = now;
break;
default:
return -1;
}
if (gcfg->cache_size) {
c = cache_insert(addr4, addr6, hash, hash_ip6(addr6));
if (c_ptr)
*c_ptr = c;
if (d) {
d->cache_entry = c;
if (c)
c->flags |= CACHE_F_REP_AGEOUT;
}
}
return 0;
}
static int extract_from_prefix(struct in_addr *addr4,
const struct in6_addr *addr6, int prefix_len)
{
switch (prefix_len) {
case 32:
if (addr6->s6_addr32[2] || addr6->s6_addr32[3])
return -1;
addr4->s_addr = addr6->s6_addr32[1];
break;
case 40:
if (addr6->s6_addr32[2] & htonl(0xff00ffff) ||
addr6->s6_addr32[3])
return -1;
#if __BYTE_ORDER == __BIG_ENDIAN
addr4->s_addr = (addr6->s6_addr32[1] << 8) | addr6->s6_addr[9];
#else
# if __BYTE_ORDER == __LITTLE_ENDIAN
addr4->s_addr = (addr6->s6_addr32[1] >> 8) |
(addr6->s6_addr32[2] << 16);
# endif
#endif
break;
case 48:
if (addr6->s6_addr32[2] & htonl(0xff0000ff) ||
addr6->s6_addr32[3])
return -1;
#if __BYTE_ORDER == __BIG_ENDIAN
addr4->s_addr = (addr6->s6_addr16[3] << 16) |
(addr6->s6_addr32[2] >> 8);
#else
# if __BYTE_ORDER == __LITTLE_ENDIAN
addr4->s_addr = addr6->s6_addr16[3] |
(addr6->s6_addr32[2] << 8);
# endif
#endif
break;
case 56:
if (addr6->s6_addr[8] || addr6->s6_addr32[3])
return -1;
#if __BYTE_ORDER == __BIG_ENDIAN
addr4->s_addr = (addr6->s6_addr[7] << 24) |
addr6->s6_addr32[2];
#else
# if __BYTE_ORDER == __LITTLE_ENDIAN
addr4->s_addr = addr6->s6_addr[7] |
addr6->s6_addr32[2];
# endif
#endif
break;
case 64:
if (addr6->s6_addr[8] ||
addr6->s6_addr32[3] & htonl(0x00ffffff))
return -1;
#if __BYTE_ORDER == __BIG_ENDIAN
addr4->s_addr = (addr6->s6_addr32[2] << 8) |
addr6->s6_addr[12];
#else
# if __BYTE_ORDER == __LITTLE_ENDIAN
addr4->s_addr = (addr6->s6_addr32[2] >> 8) |
(addr6->s6_addr32[3] << 24);
# endif
#endif
break;
case 96:
addr4->s_addr = addr6->s6_addr32[3];
break;
default:
return -1;
}
return validate_ip4_addr(addr4);
}
int map_ip6_to_ip4(struct in_addr *addr4, const struct in6_addr *addr6,
struct cache_entry **c_ptr, int dyn_alloc)
{
uint32_t hash;
struct list_head *entry;
struct cache_entry *c;
struct map6 *map6;
struct map_static *s;
struct map_dynamic *d = NULL;
if (gcfg->cache_size) {
hash = hash_ip6(addr6);
list_for_each(entry, &gcfg->hash_table6[hash]) {
c = list_entry(entry, struct cache_entry, hash6);
if (IN6_ARE_ADDR_EQUAL(addr6, &c->addr6)) {
*addr4 = c->addr4;
c->last_use = now;
if (c_ptr)
*c_ptr = c;
return 0;
}
}
}
map6 = find_map6(addr6);
if (!map6) {
if (dyn_alloc)
map6 = assign_dynamic(addr6);
if (!map6)
return -1;
}
switch (map6->type) {
case MAP_TYPE_STATIC:
s = container_of(map6, struct map_static, map6);
*addr4 = s->map4.addr;
break;
case MAP_TYPE_RFC6052:
if (extract_from_prefix(addr4, addr6, map6->prefix_len) < 0)
return -1;
if (map6->addr.s6_addr32[0] == WKPF &&
is_private_ip4_addr(addr4))
return -1;
s = container_of(map6, struct map_static, map6);
if (find_map4(addr4) != &s->map4)
return -1;
break;
case MAP_TYPE_DYNAMIC_HOST:
d = container_of(map6, struct map_dynamic, map6);
*addr4 = d->map4.addr;
d->last_use = now;
break;
default:
return -1;
}
if (gcfg->cache_size) {
c = cache_insert(addr4, addr6, hash_ip4(addr4), hash);
if (c_ptr)
*c_ptr = c;
if (d) {
d->cache_entry = c;
if (c)
c->flags |= CACHE_F_REP_AGEOUT;
}
}
return 0;
}
static void report_ageout(struct cache_entry *c)
{
struct map4 *m4;
struct map_dynamic *d;
m4 = find_map4(&c->addr4);
if (!m4 || m4->type != MAP_TYPE_DYNAMIC_HOST)
return;
d = container_of(m4, struct map_dynamic, map4);
d->last_use = c->last_use;
d->cache_entry = NULL;
}
void addrmap_maint(void)
{
struct list_head *entry, *next;
struct cache_entry *c;
list_for_each_safe(entry, next, &gcfg->cache_active) {
c = list_entry(entry, struct cache_entry, list);
if (c->last_use + CACHE_MAX_AGE < now) {
if (c->flags & CACHE_F_REP_AGEOUT)
report_ageout(c);
list_add(&c->list, &gcfg->cache_pool);
list_del(&c->hash4);
list_del(&c->hash6);
}
}
}

492
conffile.c Normal file
View File

@ -0,0 +1,492 @@
/*
* conffile.c -- config file parser
*
* part of TAYGA <http://www.litech.org/tayga/>
* Copyright (C) 2010 Nathan Lutchansky <lutchann@litech.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <tayga.h>
struct config *gcfg;
static int parse_prefix(int af, const char *src, void *prefix, int *prefix_len)
{
char *p, *end;
long int a;
int r;
p = strchr(src, '/');
if (!p)
return -1;
*p = 0;
a = strtol(p + 1, &end, 10);
r = *end || !inet_pton(af, src, prefix);
*p = '/';
if (r)
return -1;
if (a < 0 || a > (af == AF_INET6 ? 128 : 32))
return -1;
*prefix_len = a;
return 0;
}
static struct map_static *alloc_map_static(int ln)
{
struct map_static *m;
m = (struct map_static *)malloc(sizeof(struct map_static));
if (!m) {
slog(LOG_CRIT, "Unable to allocate config memory\n");
exit(1);
}
memset(m, 0, sizeof(struct map_static));
m->map4.type = MAP_TYPE_STATIC;
m->map4.prefix_len = 32;
calc_ip4_mask(&m->map4.mask, NULL, 32);
INIT_LIST_HEAD(&m->map4.list);
m->map6.type = MAP_TYPE_STATIC;
m->map6.prefix_len = 128;
calc_ip6_mask(&m->map6.mask, NULL, 128);
INIT_LIST_HEAD(&m->map6.list);
m->conffile_lineno = ln;
return m;
}
static void abort_on_conflict4(char *msg, int ln, struct map4 *old)
{
char oldaddr[INET_ADDRSTRLEN];
char oldline[128] = "";
struct map_static *s;
if (old->type == MAP_TYPE_STATIC || old->type == MAP_TYPE_RFC6052) {
s = container_of(old, struct map_static, map4);
if (s->conffile_lineno)
sprintf(oldline, " from line %d", s->conffile_lineno);
}
inet_ntop(AF_INET, &old->addr, oldaddr, sizeof(oldaddr));
if (ln)
slog(LOG_CRIT, "%s on line %d conflicts with earlier "
"definition of %s/%d%s\n", msg, ln,
oldaddr, old->prefix_len, oldline);
else
slog(LOG_CRIT, "%s conflicts with earlier "
"definition of %s/%d%s\n", msg,
oldaddr, old->prefix_len, oldline);
exit(1);
}
static void abort_on_conflict6(char *msg, int ln, struct map6 *old)
{
char oldaddr[INET6_ADDRSTRLEN];
char oldline[128] = "";
struct map_static *s;
if (old->type == MAP_TYPE_STATIC || old->type == MAP_TYPE_RFC6052) {
s = container_of(old, struct map_static, map6);
if (s->conffile_lineno)
sprintf(oldline, " from line %d", s->conffile_lineno);
}
inet_ntop(AF_INET6, &old->addr, oldaddr, sizeof(oldaddr));
if (ln)
slog(LOG_CRIT, "%s on line %d overlaps with earlier "
"definition of %s/%d%s\n", msg, ln,
oldaddr, old->prefix_len, oldline);
else
slog(LOG_CRIT, "%s overlaps with earlier "
"definition of %s/%d%s\n", msg,
oldaddr, old->prefix_len, oldline);
exit(1);
}
static void config_ipv4_addr(int ln, int arg_count, char **args)
{
if (gcfg->local_addr4.s_addr) {
slog(LOG_CRIT, "Error: duplicate ipv4-addr directive on "
"line %d\n", ln);
exit(1);
}
if (!inet_pton(AF_INET, args[0], &gcfg->local_addr4)) {
slog(LOG_CRIT, "Expected an IPv4 address but found \"%s\" on "
"line %d\n", args[0], ln);
exit(1);
}
if (validate_ip4_addr(&gcfg->local_addr4) < 0) {
slog(LOG_CRIT, "Cannot use reserved address %s in ipv4-addr "
"directive, aborting...\n", args[0]);
exit(1);
}
}
static void config_ipv6_addr(int ln, int arg_count, char **args)
{
if (gcfg->local_addr6.s6_addr[0]) {
slog(LOG_CRIT, "Error: duplicate ipv6-addr directive on line "
"%d\n", ln);
exit(1);
}
if (!inet_pton(AF_INET6, args[0], &gcfg->local_addr6)) {
slog(LOG_CRIT, "Expected an IPv6 address but found \"%s\" on "
"line %d\n", args[0], ln);
exit(1);
}
if (validate_ip6_addr(&gcfg->local_addr6) < 0) {
slog(LOG_CRIT, "Cannot use reserved address %s in ipv6-addr "
"directive, aborting...\n", args[0]);
exit(1);
}
if (gcfg->local_addr6.s6_addr32[0] == WKPF) {
slog(LOG_CRIT, "Error: ipv6-addr directive cannot contain an "
"address in the Well-Known Prefix "
"(64:ff9b::/96)\n");
exit(1);
}
}
static void config_prefix(int ln, int arg_count, char **args)
{
struct map_static *m;
struct map6 *m6;
m = alloc_map_static(ln);
m->map4.prefix_len = 0;
m->map4.mask.s_addr = 0;
m->map4.type = MAP_TYPE_RFC6052;
m->map6.type = MAP_TYPE_RFC6052;
m6 = &m->map6;
if (parse_prefix(AF_INET6, args[0], &m6->addr, &m6->prefix_len) ||
calc_ip6_mask(&m6->mask, &m6->addr, m6->prefix_len)) {
slog(LOG_CRIT, "Expected an IPv6 prefix but found \"%s\" on "
"line %d\n", args[0], ln);
exit(1);
}
if (validate_ip6_addr(&m6->addr) < 0) {
slog(LOG_CRIT, "Cannot use reserved address %s in prefix "
"directive, aborting...\n", args[0]);
exit(1);
}
if (m6->prefix_len != 32 && m6->prefix_len != 40 &&
m6->prefix_len != 48 && m6->prefix_len != 56 &&
m6->prefix_len != 64 && m6->prefix_len != 96) {
slog(LOG_CRIT, "NAT prefix length must be 32, 40, 48, 56, 64 "
"or 96 only, aborting...\n");
exit(1);
}
if (insert_map4(&m->map4, NULL) < 0) {
slog(LOG_CRIT, "Error: duplicate prefix directive on line %d\n",
ln);
exit(1);
}
if (insert_map6(&m->map6, &m6) < 0)
abort_on_conflict6("Error: NAT64 prefix", ln, m6);
}
static void config_tun_device(int ln, int arg_count, char **args)
{
if (gcfg->tundev[0]) {
slog(LOG_CRIT, "Error: duplicate tun-device directive on line "
"%d\n", ln);
exit(1);
}
if (strlen(args[0]) + 1 > sizeof(gcfg->tundev)) {
slog(LOG_CRIT, "Device name \"%s\" is invalid on line %d\n",
args[0], ln);
exit(1);
}
strcpy(gcfg->tundev, args[0]);
}
static void config_map(int ln, int arg_count, char **args)
{
struct map_static *m;
struct map4 *m4;
struct map6 *m6;
m = alloc_map_static(ln);
if (!inet_pton(AF_INET, args[0], &m->map4.addr)) {
slog(LOG_CRIT, "Expected an IPv4 address but found \"%s\" on "
"line %d\n", args[0], ln);
exit(1);
}
if (!inet_pton(AF_INET6, args[1], &m->map6.addr)) {
slog(LOG_CRIT, "Expected an IPv6 address but found \"%s\" on "
"line %d\n", args[1], ln);
exit(1);
}
if (validate_ip4_addr(&m->map4.addr) < 0) {
slog(LOG_CRIT, "Cannot use reserved address %s in map "
"directive, aborting...\n", args[0]);
exit(1);
}
if (validate_ip6_addr(&m->map6.addr) < 0) {
slog(LOG_CRIT, "Cannot use reserved address %s in map "
"directive, aborting...\n", args[1]);
exit(1);
}
if (m->map6.addr.s6_addr32[0] == WKPF) {
slog(LOG_CRIT, "Cannot create single-host maps inside "
"64:ff9b::/96, aborting...\n");
exit(1);
}
if (insert_map4(&m->map4, &m4) < 0)
abort_on_conflict4("Error: IPv4 address in map directive",
ln, m4);
if (insert_map6(&m->map6, &m6) < 0)
abort_on_conflict6("Error: IPv6 address in map directive",
ln, m6);
}
static void config_dynamic_pool(int ln, int arg_count, char **args)
{
struct dynamic_pool *pool;
struct map4 *m4;
if (gcfg->dynamic_pool) {
slog(LOG_CRIT, "Error: duplicate dynamic-pool directive on "
"line %d\n", ln);
exit(1);
}
pool = (struct dynamic_pool *)malloc(sizeof(struct dynamic_pool));
if (!pool) {
slog(LOG_CRIT, "Unable to allocate config memory\n");
exit(1);
}
memset(pool, 0, sizeof(struct dynamic_pool));
INIT_LIST_HEAD(&pool->mapped_list);
INIT_LIST_HEAD(&pool->dormant_list);
INIT_LIST_HEAD(&pool->free_list);
m4 = &pool->map4;
m4->type = MAP_TYPE_DYNAMIC_POOL;
INIT_LIST_HEAD(&m4->list);
if (parse_prefix(AF_INET, args[0], &m4->addr, &m4->prefix_len) ||
calc_ip4_mask(&m4->mask, &m4->addr, m4->prefix_len)) {
slog(LOG_CRIT, "Expected an IPv4 prefix but found \"%s\" on "
"line %d\n", args[0], ln);
exit(1);
}
if (validate_ip4_addr(&m4->addr) < 0) {
slog(LOG_CRIT, "Cannot use reserved address %s in dynamic-pool "
"directive, aborting...\n", args[0]);
exit(1);
}
if (m4->prefix_len > 31) {
slog(LOG_CRIT, "Cannot use a prefix longer than /31 in "
"dynamic-pool directive, aborting...\n");
exit(1);
}
if (insert_map4(&pool->map4, &m4) < 0)
abort_on_conflict4("Error: IPv4 prefix in dynamic-pool "
"directive", ln, m4);
pool->free_head.addr = ntohl(m4->addr.s_addr);
pool->free_head.count = (1 << (32 - m4->prefix_len)) - 1;
INIT_LIST_HEAD(&pool->free_head.list);
list_add(&pool->free_head.list, &pool->free_list);
gcfg->dynamic_pool = pool;
}
static void config_data_dir(int ln, int arg_count, char **args)
{
if (gcfg->data_dir[0]) {
slog(LOG_CRIT, "Error: duplicate data-dir directive on line "
"%d\n", ln);
exit(1);
}
if (args[0][0] != '/') {
slog(LOG_CRIT, "Error: data-dir must be an absolute path\n");
exit(1);
}
strcpy(gcfg->data_dir, args[0]);
}
static void config_strict_fh(int ln, int arg_count, char **args)
{
if (!strcasecmp(args[0], "true") || !strcasecmp(args[0], "on") ||
!strcasecmp(args[0], "1")) {
gcfg->lazy_frag_hdr = 0;
} else if (!strcasecmp(args[0], "false") ||
!strcasecmp(args[0], "off") ||
!strcasecmp(args[0], "0")) {
gcfg->lazy_frag_hdr = 1;
} else {
slog(LOG_CRIT, "Error: invalid value for strict-frag-hdr\n");
exit(1);
}
}
struct {
char *name;
void (*config_func)(int ln, int arg_count, char **args);
int need_args;
} config_directives[] = {
{ "ipv4-addr", config_ipv4_addr, 1 },
{ "ipv6-addr", config_ipv6_addr, 1 },
{ "prefix", config_prefix, 1 },
{ "tun-device", config_tun_device, 1 },
{ "map", config_map, 2 },
{ "dynamic-pool", config_dynamic_pool, 1 },
{ "data-dir", config_data_dir, 1 },
{ "strict-frag-hdr", config_strict_fh, 1 },
{ NULL, NULL, 0 }
};
void read_config(char *conffile)
{
FILE *in;
int ln = 0;
char line[512];
char addrbuf[128];
char *c, *tokptr;
#define MAX_ARGS 10
char *args[MAX_ARGS];
int arg_count;
int i;
struct map_static *m;
struct map4 *m4;
struct map6 *m6;
gcfg = (struct config *)malloc(sizeof(struct config));
if (!gcfg)
goto malloc_fail;
memset(gcfg, 0, sizeof(struct config));
gcfg->recv_buf_size = 65536 + sizeof(struct tun_pi);
INIT_LIST_HEAD(&gcfg->map4_list);
INIT_LIST_HEAD(&gcfg->map6_list);
gcfg->dyn_min_lease = 7200 + 4 * 60; /* just over two hours */
gcfg->dyn_max_lease = 14 * 86400;
gcfg->max_commit_delay = gcfg->dyn_max_lease / 4;
gcfg->hash_bits = 7;
gcfg->cache_size = 8192;
gcfg->allow_ident_gen = 1;
gcfg->ipv6_offlink_mtu = 1280;
gcfg->lazy_frag_hdr = 1;
INIT_LIST_HEAD(&gcfg->cache_pool);
INIT_LIST_HEAD(&gcfg->cache_active);
in = fopen(conffile, "r");
if (!in) {
slog(LOG_CRIT, "unable to open %s, aborting: %s\n", conffile,
strerror(errno));
exit(1);
}
while (fgets(line, sizeof(line), in)) {
++ln;
if (strlen(line) + 1 == sizeof(line)) {
slog(LOG_CRIT, "Line %d of %s is too long, "
"aborting...\n", ln, conffile);
exit(1);
}
arg_count = 0;
for (;;) {
c = strtok_r(arg_count ? NULL : line, DELIM, &tokptr);
if (!c || *c == '#')
break;
if (arg_count == MAX_ARGS) {
slog(LOG_CRIT, "Line %d of %s is too long, "
"aborting...\n", ln, conffile);
exit(1);
}
args[arg_count++] = c;
}
if (arg_count == 0)
continue;
for (i = 0; config_directives[i].name; ++i)
if (!strcasecmp(args[0], config_directives[i].name))
break;
if (!config_directives[i].name) {
slog(LOG_CRIT, "Unknown directive \"%s\" on line %d of "
"%s, aborting...\n", args[0],
ln, conffile);
exit(1);
}
--arg_count;
if (config_directives[i].need_args >= 0 &&
arg_count != config_directives[i].need_args) {
slog(LOG_CRIT, "Incorrect number of arguments on "
"line %d\n", ln);
exit(1);
}
config_directives[i].config_func(ln, arg_count, &args[1]);
}
fclose(in);
if (list_empty(&gcfg->map6_list)) {
slog(LOG_CRIT, "Error: no translation maps or NAT64 prefix "
"configured\n");
exit(1);
}
m4 = list_entry(gcfg->map4_list.next, struct map4, list);
m6 = list_entry(gcfg->map6_list.next, struct map6, list);
if (m4->type == MAP_TYPE_RFC6052 && m6->type == MAP_TYPE_RFC6052 &&
!gcfg->allow_ident_gen)
gcfg->cache_size = 0;
if (!gcfg->local_addr4.s_addr) {
slog(LOG_CRIT, "Error: no ipv4-addr directive found\n");
exit(1);
}
m = alloc_map_static(0);
m->map4.addr = gcfg->local_addr4;
if (insert_map4(&m->map4, &m4) < 0)
abort_on_conflict4("Error: ipv4-addr", 0, m4);
if (gcfg->local_addr6.s6_addr32[0]) {
m->map6.addr = gcfg->local_addr6;
if (insert_map6(&m->map6, &m6) < 0) {
if (m6->type == MAP_TYPE_RFC6052) {
inet_ntop(AF_INET6, &m6->addr,
addrbuf, sizeof(addrbuf));
slog(LOG_CRIT, "Error: ipv6-addr cannot reside "
"within configured prefix "
"%s/%d\n", addrbuf,
m6->prefix_len);
exit(1);
} else {
abort_on_conflict6("Error: ipv6-addr", 0, m6);
}
}
} else {
m6 = list_entry(gcfg->map6_list.prev, struct map6, list);
if (m6->type != MAP_TYPE_RFC6052) {
slog(LOG_CRIT, "Error: ipv6-addr directive must be "
"specified if no NAT64 prefix is "
"configured\n");
exit(1);
}
if (append_to_prefix(&gcfg->local_addr6, &gcfg->local_addr4,
&m6->addr, m6->prefix_len)) {
slog(LOG_CRIT, "Error: ipv6-addr directive must be "
"specified if prefix is 64:ff9b::/96 "
"and ipv4-addr is a non-global "
"(RFC 1918) address\n");
exit(1);
}
m->map6.addr = gcfg->local_addr6;
}
return;
malloc_fail:
slog(LOG_CRIT, "Unable to allocate config memory\n");
exit(1);
}

25
config.h.in Normal file
View File

@ -0,0 +1,25 @@
/* config.h.in. Generated from configure.ac by autoheader. */
/* Name of package */
#undef PACKAGE
/* Define to the address where bug reports for this package should be sent. */
#undef PACKAGE_BUGREPORT
/* Define to the full name of this package. */
#undef PACKAGE_NAME
/* Define to the full name and version of this package. */
#undef PACKAGE_STRING
/* Define to the one symbol short name of this package. */
#undef PACKAGE_TARNAME
/* Define to the home page for this package. */
#undef PACKAGE_URL
/* Define to the version of this package. */
#undef PACKAGE_VERSION
/* Version number of package */
#undef VERSION

4670
configure vendored Executable file
View File

File diff suppressed because it is too large Load Diff

14
configure.ac Normal file
View File

@ -0,0 +1,14 @@
AC_INIT(tayga, 0.9.2)
AC_CONFIG_SRCDIR(nat64.c)
AM_INIT_AUTOMAKE([foreign dist-bzip2])
AC_CONFIG_HEADERS(config.h)
AC_PROG_CC
CFLAGS='-g -Wall'
tayga_conf_path=${sysconfdir}/tayga.conf
AC_SUBST(tayga_conf_path)
AC_OUTPUT([Makefile])

630
depcomp Executable file
View File

@ -0,0 +1,630 @@
#! /bin/sh
# depcomp - compile a program generating dependencies as side-effects
scriptversion=2009-04-28.21; # UTC
# Copyright (C) 1999, 2000, 2003, 2004, 2005, 2006, 2007, 2009 Free
# Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# As a special exception to the GNU General Public License, if you
# distribute this file as part of a program that contains a
# configuration script generated by Autoconf, you may include it under
# the same distribution terms that you use for the rest of that program.
# Originally written by Alexandre Oliva <oliva@dcc.unicamp.br>.
case $1 in
'')
echo "$0: No command. Try \`$0 --help' for more information." 1>&2
exit 1;
;;
-h | --h*)
cat <<\EOF
Usage: depcomp [--help] [--version] PROGRAM [ARGS]
Run PROGRAMS ARGS to compile a file, generating dependencies
as side-effects.
Environment variables:
depmode Dependency tracking mode.
source Source file read by `PROGRAMS ARGS'.
object Object file output by `PROGRAMS ARGS'.
DEPDIR directory where to store dependencies.
depfile Dependency file to output.
tmpdepfile Temporary file to use when outputing dependencies.
libtool Whether libtool is used (yes/no).
Report bugs to <bug-automake@gnu.org>.
EOF
exit $?
;;
-v | --v*)
echo "depcomp $scriptversion"
exit $?
;;
esac
if test -z "$depmode" || test -z "$source" || test -z "$object"; then
echo "depcomp: Variables source, object and depmode must be set" 1>&2
exit 1
fi
# Dependencies for sub/bar.o or sub/bar.obj go into sub/.deps/bar.Po.
depfile=${depfile-`echo "$object" |
sed 's|[^\\/]*$|'${DEPDIR-.deps}'/&|;s|\.\([^.]*\)$|.P\1|;s|Pobj$|Po|'`}
tmpdepfile=${tmpdepfile-`echo "$depfile" | sed 's/\.\([^.]*\)$/.T\1/'`}
rm -f "$tmpdepfile"
# Some modes work just like other modes, but use different flags. We
# parameterize here, but still list the modes in the big case below,
# to make depend.m4 easier to write. Note that we *cannot* use a case
# here, because this file can only contain one case statement.
if test "$depmode" = hp; then
# HP compiler uses -M and no extra arg.
gccflag=-M
depmode=gcc
fi
if test "$depmode" = dashXmstdout; then
# This is just like dashmstdout with a different argument.
dashmflag=-xM
depmode=dashmstdout
fi
cygpath_u="cygpath -u -f -"
if test "$depmode" = msvcmsys; then
# This is just like msvisualcpp but w/o cygpath translation.
# Just convert the backslash-escaped backslashes to single forward
# slashes to satisfy depend.m4
cygpath_u="sed s,\\\\\\\\,/,g"
depmode=msvisualcpp
fi
case "$depmode" in
gcc3)
## gcc 3 implements dependency tracking that does exactly what
## we want. Yay! Note: for some reason libtool 1.4 doesn't like
## it if -MD -MP comes after the -MF stuff. Hmm.
## Unfortunately, FreeBSD c89 acceptance of flags depends upon
## the command line argument order; so add the flags where they
## appear in depend2.am. Note that the slowdown incurred here
## affects only configure: in makefiles, %FASTDEP% shortcuts this.
for arg
do
case $arg in
-c) set fnord "$@" -MT "$object" -MD -MP -MF "$tmpdepfile" "$arg" ;;
*) set fnord "$@" "$arg" ;;
esac
shift # fnord
shift # $arg
done
"$@"
stat=$?
if test $stat -eq 0; then :
else
rm -f "$tmpdepfile"
exit $stat
fi
mv "$tmpdepfile" "$depfile"
;;
gcc)
## There are various ways to get dependency output from gcc. Here's
## why we pick this rather obscure method:
## - Don't want to use -MD because we'd like the dependencies to end
## up in a subdir. Having to rename by hand is ugly.
## (We might end up doing this anyway to support other compilers.)
## - The DEPENDENCIES_OUTPUT environment variable makes gcc act like
## -MM, not -M (despite what the docs say).
## - Using -M directly means running the compiler twice (even worse
## than renaming).
if test -z "$gccflag"; then
gccflag=-MD,
fi
"$@" -Wp,"$gccflag$tmpdepfile"
stat=$?
if test $stat -eq 0; then :
else
rm -f "$tmpdepfile"
exit $stat
fi
rm -f "$depfile"
echo "$object : \\" > "$depfile"
alpha=ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
## The second -e expression handles DOS-style file names with drive letters.
sed -e 's/^[^:]*: / /' \
-e 's/^['$alpha']:\/[^:]*: / /' < "$tmpdepfile" >> "$depfile"
## This next piece of magic avoids the `deleted header file' problem.
## The problem is that when a header file which appears in a .P file
## is deleted, the dependency causes make to die (because there is
## typically no way to rebuild the header). We avoid this by adding
## dummy dependencies for each header file. Too bad gcc doesn't do
## this for us directly.
tr ' ' '
' < "$tmpdepfile" |
## Some versions of gcc put a space before the `:'. On the theory
## that the space means something, we add a space to the output as
## well.
## Some versions of the HPUX 10.20 sed can't process this invocation
## correctly. Breaking it into two sed invocations is a workaround.
sed -e 's/^\\$//' -e '/^$/d' -e '/:$/d' | sed -e 's/$/ :/' >> "$depfile"
rm -f "$tmpdepfile"
;;
hp)
# This case exists only to let depend.m4 do its work. It works by
# looking at the text of this script. This case will never be run,
# since it is checked for above.
exit 1
;;
sgi)
if test "$libtool" = yes; then
"$@" "-Wp,-MDupdate,$tmpdepfile"
else
"$@" -MDupdate "$tmpdepfile"
fi
stat=$?
if test $stat -eq 0; then :
else
rm -f "$tmpdepfile"
exit $stat
fi
rm -f "$depfile"
if test -f "$tmpdepfile"; then # yes, the sourcefile depend on other files
echo "$object : \\" > "$depfile"
# Clip off the initial element (the dependent). Don't try to be
# clever and replace this with sed code, as IRIX sed won't handle
# lines with more than a fixed number of characters (4096 in
# IRIX 6.2 sed, 8192 in IRIX 6.5). We also remove comment lines;
# the IRIX cc adds comments like `#:fec' to the end of the
# dependency line.
tr ' ' '
' < "$tmpdepfile" \
| sed -e 's/^.*\.o://' -e 's/#.*$//' -e '/^$/ d' | \
tr '
' ' ' >> "$depfile"
echo >> "$depfile"
# The second pass generates a dummy entry for each header file.
tr ' ' '
' < "$tmpdepfile" \
| sed -e 's/^.*\.o://' -e 's/#.*$//' -e '/^$/ d' -e 's/$/:/' \
>> "$depfile"
else
# The sourcefile does not contain any dependencies, so just
# store a dummy comment line, to avoid errors with the Makefile
# "include basename.Plo" scheme.
echo "#dummy" > "$depfile"
fi
rm -f "$tmpdepfile"
;;
aix)
# The C for AIX Compiler uses -M and outputs the dependencies
# in a .u file. In older versions, this file always lives in the
# current directory. Also, the AIX compiler puts `$object:' at the
# start of each line; $object doesn't have directory information.
# Version 6 uses the directory in both cases.
dir=`echo "$object" | sed -e 's|/[^/]*$|/|'`
test "x$dir" = "x$object" && dir=
base=`echo "$object" | sed -e 's|^.*/||' -e 's/\.o$//' -e 's/\.lo$//'`
if test "$libtool" = yes; then
tmpdepfile1=$dir$base.u
tmpdepfile2=$base.u
tmpdepfile3=$dir.libs/$base.u
"$@" -Wc,-M
else
tmpdepfile1=$dir$base.u
tmpdepfile2=$dir$base.u
tmpdepfile3=$dir$base.u
"$@" -M
fi
stat=$?
if test $stat -eq 0; then :
else
rm -f "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3"
exit $stat
fi
for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3"
do
test -f "$tmpdepfile" && break
done
if test -f "$tmpdepfile"; then
# Each line is of the form `foo.o: dependent.h'.
# Do two passes, one to just change these to
# `$object: dependent.h' and one to simply `dependent.h:'.
sed -e "s,^.*\.[a-z]*:,$object:," < "$tmpdepfile" > "$depfile"
# That's a tab and a space in the [].
sed -e 's,^.*\.[a-z]*:[ ]*,,' -e 's,$,:,' < "$tmpdepfile" >> "$depfile"
else
# The sourcefile does not contain any dependencies, so just
# store a dummy comment line, to avoid errors with the Makefile
# "include basename.Plo" scheme.
echo "#dummy" > "$depfile"
fi
rm -f "$tmpdepfile"
;;
icc)
# Intel's C compiler understands `-MD -MF file'. However on
# icc -MD -MF foo.d -c -o sub/foo.o sub/foo.c
# ICC 7.0 will fill foo.d with something like
# foo.o: sub/foo.c
# foo.o: sub/foo.h
# which is wrong. We want:
# sub/foo.o: sub/foo.c
# sub/foo.o: sub/foo.h
# sub/foo.c:
# sub/foo.h:
# ICC 7.1 will output
# foo.o: sub/foo.c sub/foo.h
# and will wrap long lines using \ :
# foo.o: sub/foo.c ... \
# sub/foo.h ... \
# ...
"$@" -MD -MF "$tmpdepfile"
stat=$?
if test $stat -eq 0; then :
else
rm -f "$tmpdepfile"
exit $stat
fi
rm -f "$depfile"
# Each line is of the form `foo.o: dependent.h',
# or `foo.o: dep1.h dep2.h \', or ` dep3.h dep4.h \'.
# Do two passes, one to just change these to
# `$object: dependent.h' and one to simply `dependent.h:'.
sed "s,^[^:]*:,$object :," < "$tmpdepfile" > "$depfile"
# Some versions of the HPUX 10.20 sed can't process this invocation
# correctly. Breaking it into two sed invocations is a workaround.
sed 's,^[^:]*: \(.*\)$,\1,;s/^\\$//;/^$/d;/:$/d' < "$tmpdepfile" |
sed -e 's/$/ :/' >> "$depfile"
rm -f "$tmpdepfile"
;;
hp2)
# The "hp" stanza above does not work with aCC (C++) and HP's ia64
# compilers, which have integrated preprocessors. The correct option
# to use with these is +Maked; it writes dependencies to a file named
# 'foo.d', which lands next to the object file, wherever that
# happens to be.
# Much of this is similar to the tru64 case; see comments there.
dir=`echo "$object" | sed -e 's|/[^/]*$|/|'`
test "x$dir" = "x$object" && dir=
base=`echo "$object" | sed -e 's|^.*/||' -e 's/\.o$//' -e 's/\.lo$//'`
if test "$libtool" = yes; then
tmpdepfile1=$dir$base.d
tmpdepfile2=$dir.libs/$base.d
"$@" -Wc,+Maked
else
tmpdepfile1=$dir$base.d
tmpdepfile2=$dir$base.d
"$@" +Maked
fi
stat=$?
if test $stat -eq 0; then :
else
rm -f "$tmpdepfile1" "$tmpdepfile2"
exit $stat
fi
for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2"
do
test -f "$tmpdepfile" && break
done
if test -f "$tmpdepfile"; then
sed -e "s,^.*\.[a-z]*:,$object:," "$tmpdepfile" > "$depfile"
# Add `dependent.h:' lines.
sed -ne '2,${
s/^ *//
s/ \\*$//
s/$/:/
p
}' "$tmpdepfile" >> "$depfile"
else
echo "#dummy" > "$depfile"
fi
rm -f "$tmpdepfile" "$tmpdepfile2"
;;
tru64)
# The Tru64 compiler uses -MD to generate dependencies as a side
# effect. `cc -MD -o foo.o ...' puts the dependencies into `foo.o.d'.
# At least on Alpha/Redhat 6.1, Compaq CCC V6.2-504 seems to put
# dependencies in `foo.d' instead, so we check for that too.
# Subdirectories are respected.
dir=`echo "$object" | sed -e 's|/[^/]*$|/|'`
test "x$dir" = "x$object" && dir=
base=`echo "$object" | sed -e 's|^.*/||' -e 's/\.o$//' -e 's/\.lo$//'`
if test "$libtool" = yes; then
# With Tru64 cc, shared objects can also be used to make a
# static library. This mechanism is used in libtool 1.4 series to
# handle both shared and static libraries in a single compilation.
# With libtool 1.4, dependencies were output in $dir.libs/$base.lo.d.
#
# With libtool 1.5 this exception was removed, and libtool now
# generates 2 separate objects for the 2 libraries. These two
# compilations output dependencies in $dir.libs/$base.o.d and
# in $dir$base.o.d. We have to check for both files, because
# one of the two compilations can be disabled. We should prefer
# $dir$base.o.d over $dir.libs/$base.o.d because the latter is
# automatically cleaned when .libs/ is deleted, while ignoring
# the former would cause a distcleancheck panic.
tmpdepfile1=$dir.libs/$base.lo.d # libtool 1.4
tmpdepfile2=$dir$base.o.d # libtool 1.5
tmpdepfile3=$dir.libs/$base.o.d # libtool 1.5
tmpdepfile4=$dir.libs/$base.d # Compaq CCC V6.2-504
"$@" -Wc,-MD
else
tmpdepfile1=$dir$base.o.d
tmpdepfile2=$dir$base.d
tmpdepfile3=$dir$base.d
tmpdepfile4=$dir$base.d
"$@" -MD
fi
stat=$?
if test $stat -eq 0; then :
else
rm -f "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3" "$tmpdepfile4"
exit $stat
fi
for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3" "$tmpdepfile4"
do
test -f "$tmpdepfile" && break
done
if test -f "$tmpdepfile"; then
sed -e "s,^.*\.[a-z]*:,$object:," < "$tmpdepfile" > "$depfile"
# That's a tab and a space in the [].
sed -e 's,^.*\.[a-z]*:[ ]*,,' -e 's,$,:,' < "$tmpdepfile" >> "$depfile"
else
echo "#dummy" > "$depfile"
fi
rm -f "$tmpdepfile"
;;
#nosideeffect)
# This comment above is used by automake to tell side-effect
# dependency tracking mechanisms from slower ones.
dashmstdout)
# Important note: in order to support this mode, a compiler *must*
# always write the preprocessed file to stdout, regardless of -o.
"$@" || exit $?
# Remove the call to Libtool.
if test "$libtool" = yes; then
while test "X$1" != 'X--mode=compile'; do
shift
done
shift
fi
# Remove `-o $object'.
IFS=" "
for arg
do
case $arg in
-o)
shift
;;
$object)
shift
;;
*)
set fnord "$@" "$arg"
shift # fnord
shift # $arg
;;
esac
done
test -z "$dashmflag" && dashmflag=-M
# Require at least two characters before searching for `:'
# in the target name. This is to cope with DOS-style filenames:
# a dependency such as `c:/foo/bar' could be seen as target `c' otherwise.
"$@" $dashmflag |
sed 's:^[ ]*[^: ][^:][^:]*\:[ ]*:'"$object"'\: :' > "$tmpdepfile"
rm -f "$depfile"
cat < "$tmpdepfile" > "$depfile"
tr ' ' '
' < "$tmpdepfile" | \
## Some versions of the HPUX 10.20 sed can't process this invocation
## correctly. Breaking it into two sed invocations is a workaround.
sed -e 's/^\\$//' -e '/^$/d' -e '/:$/d' | sed -e 's/$/ :/' >> "$depfile"
rm -f "$tmpdepfile"
;;
dashXmstdout)
# This case only exists to satisfy depend.m4. It is never actually
# run, as this mode is specially recognized in the preamble.
exit 1
;;
makedepend)
"$@" || exit $?
# Remove any Libtool call
if test "$libtool" = yes; then
while test "X$1" != 'X--mode=compile'; do
shift
done
shift
fi
# X makedepend
shift
cleared=no eat=no
for arg
do
case $cleared in
no)
set ""; shift
cleared=yes ;;
esac
if test $eat = yes; then
eat=no
continue
fi
case "$arg" in
-D*|-I*)
set fnord "$@" "$arg"; shift ;;
# Strip any option that makedepend may not understand. Remove
# the object too, otherwise makedepend will parse it as a source file.
-arch)
eat=yes ;;
-*|$object)
;;
*)
set fnord "$@" "$arg"; shift ;;
esac
done
obj_suffix=`echo "$object" | sed 's/^.*\././'`
touch "$tmpdepfile"
${MAKEDEPEND-makedepend} -o"$obj_suffix" -f"$tmpdepfile" "$@"
rm -f "$depfile"
cat < "$tmpdepfile" > "$depfile"
sed '1,2d' "$tmpdepfile" | tr ' ' '
' | \
## Some versions of the HPUX 10.20 sed can't process this invocation
## correctly. Breaking it into two sed invocations is a workaround.
sed -e 's/^\\$//' -e '/^$/d' -e '/:$/d' | sed -e 's/$/ :/' >> "$depfile"
rm -f "$tmpdepfile" "$tmpdepfile".bak
;;
cpp)
# Important note: in order to support this mode, a compiler *must*
# always write the preprocessed file to stdout.
"$@" || exit $?
# Remove the call to Libtool.
if test "$libtool" = yes; then
while test "X$1" != 'X--mode=compile'; do
shift
done
shift
fi
# Remove `-o $object'.
IFS=" "
for arg
do
case $arg in
-o)
shift
;;
$object)
shift
;;
*)
set fnord "$@" "$arg"
shift # fnord
shift # $arg
;;
esac
done
"$@" -E |
sed -n -e '/^# [0-9][0-9]* "\([^"]*\)".*/ s:: \1 \\:p' \
-e '/^#line [0-9][0-9]* "\([^"]*\)".*/ s:: \1 \\:p' |
sed '$ s: \\$::' > "$tmpdepfile"
rm -f "$depfile"
echo "$object : \\" > "$depfile"
cat < "$tmpdepfile" >> "$depfile"
sed < "$tmpdepfile" '/^$/d;s/^ //;s/ \\$//;s/$/ :/' >> "$depfile"
rm -f "$tmpdepfile"
;;
msvisualcpp)
# Important note: in order to support this mode, a compiler *must*
# always write the preprocessed file to stdout.
"$@" || exit $?
# Remove the call to Libtool.
if test "$libtool" = yes; then
while test "X$1" != 'X--mode=compile'; do
shift
done
shift
fi
IFS=" "
for arg
do
case "$arg" in
-o)
shift
;;
$object)
shift
;;
"-Gm"|"/Gm"|"-Gi"|"/Gi"|"-ZI"|"/ZI")
set fnord "$@"
shift
shift
;;
*)
set fnord "$@" "$arg"
shift
shift
;;
esac
done
"$@" -E 2>/dev/null |
sed -n '/^#line [0-9][0-9]* "\([^"]*\)"/ s::\1:p' | $cygpath_u | sort -u > "$tmpdepfile"
rm -f "$depfile"
echo "$object : \\" > "$depfile"
sed < "$tmpdepfile" -n -e 's% %\\ %g' -e '/^\(.*\)$/ s:: \1 \\:p' >> "$depfile"
echo " " >> "$depfile"
sed < "$tmpdepfile" -n -e 's% %\\ %g' -e '/^\(.*\)$/ s::\1\::p' >> "$depfile"
rm -f "$tmpdepfile"
;;
msvcmsys)
# This case exists only to let depend.m4 do its work. It works by
# looking at the text of this script. This case will never be run,
# since it is checked for above.
exit 1
;;
none)
exec "$@"
;;
*)
echo "Unknown depmode $depmode" 1>&2
exit 1
;;
esac
exit 0
# Local Variables:
# mode: shell-script
# sh-indentation: 2
# eval: (add-hook 'write-file-hooks 'time-stamp)
# time-stamp-start: "scriptversion="
# time-stamp-format: "%:y-%02m-%02d.%02H"
# time-stamp-time-zone: "UTC"
# time-stamp-end: "; # UTC"
# End:

396
dynamic.c Normal file
View File

@ -0,0 +1,396 @@
/*
* dynamic.c -- dynamic address mapper
*
* part of TAYGA <http://www.litech.org/tayga/>
* Copyright (C) 2010 Nathan Lutchansky <lutchann@litech.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <tayga.h>
#define MAP_FILE "dynamic.map"
#define TMP_MAP_FILE "dynamic.map~~"
extern struct config *gcfg;
extern time_t now;
static struct map_dynamic *alloc_map_dynamic(const struct in6_addr *addr6,
const struct in_addr *addr4, struct free_addr *f)
{
struct map_dynamic *d;
uint32_t a = ntohl(addr4->s_addr);
d = (struct map_dynamic *)malloc(sizeof(struct map_dynamic));
if (!d) {
slog(LOG_CRIT, "Unable to allocate memory\n");
return NULL;
}
memset(d, 0, sizeof(struct map_dynamic));
INIT_LIST_HEAD(&d->list);
d->map4.type = MAP_TYPE_DYNAMIC_HOST;
d->map4.addr = *addr4;
d->map4.prefix_len = 32;
calc_ip4_mask(&d->map4.mask, NULL, 32);
INIT_LIST_HEAD(&d->map4.list);
d->map6.type = MAP_TYPE_DYNAMIC_HOST;
d->map6.addr = *addr6;
d->map6.prefix_len = 128;
calc_ip6_mask(&d->map6.mask, NULL, 128);
INIT_LIST_HEAD(&d->map6.list);
d->free.addr = a;
d->free.count = f->count - (a - f->addr);
f->count = a - f->addr - 1;
INIT_LIST_HEAD(&d->free.list);
list_add(&d->free.list, &f->list);
return d;
}
static void move_to_mapped(struct map_dynamic *d, struct dynamic_pool *pool)
{
insert_map4(&d->map4, NULL);
insert_map6(&d->map6, NULL);
list_add(&d->list, &pool->mapped_list);
}
static void move_to_dormant(struct map_dynamic *d, struct dynamic_pool *pool)
{
struct list_head *entry;
struct map_dynamic *s;
list_del(&d->map4.list);
list_del(&d->map6.list);
if (list_empty(&pool->dormant_list)) {
list_add_tail(&d->list, &pool->dormant_list);
return;
}
s = list_entry(pool->dormant_list.prev, struct map_dynamic, list);
if (s->last_use >= d->last_use) {
list_add_tail(&d->list, &pool->dormant_list);
return;
}
list_for_each(entry, &pool->dormant_list) {
s = list_entry(entry, struct map_dynamic, list);
if (s->last_use < d->last_use)
break;
}
list_add_tail(&d->list, entry);
}
static void print_dyn_change(char *str, struct map_dynamic *d)
{
char addrbuf4[INET_ADDRSTRLEN];
char addrbuf6[INET6_ADDRSTRLEN];
inet_ntop(AF_INET, &d->map4.addr, addrbuf4, sizeof(addrbuf4));
inet_ntop(AF_INET6, &d->map6.addr, addrbuf6, sizeof(addrbuf6));
slog(LOG_DEBUG, "%s pool address %s (%s)\n", str, addrbuf4, addrbuf6);
}
struct map6 *assign_dynamic(const struct in6_addr *addr6)
{
struct dynamic_pool *pool;
struct list_head *entry;
struct free_addr *f;
uint32_t i, addr, base, max;
struct in_addr addr4;
struct map4 *m4;
struct map_dynamic *d;
pool = gcfg->dynamic_pool;
if (!pool)
return NULL;
list_for_each(entry, &pool->dormant_list) {
d = list_entry(entry, struct map_dynamic, list);
if (IN6_ARE_ADDR_EQUAL(addr6, &d->map6.addr)) {
print_dyn_change("reactivated dormant", d);
goto activate;
}
}
base = 0;
max = (1 << (32 - pool->map4.prefix_len)) - 1;
for (i = 0; i < 4; ++i) {
base += addr6->s6_addr32[i];
while (base & ~max)
base = (base & max) +
(base >> (32 - pool->map4.prefix_len));
}
for (i = 0, entry = NULL; i <= max; ++i) {
addr = pool->free_head.addr | ((base + i) & max);
if (!entry || addr == pool->free_head.addr)
entry = pool->free_list.next;
for (;;) {
f = list_entry(entry, struct free_addr, list);
if (f->addr + f->count >= addr)
break;
entry = entry->next;
}
if (f->addr >= addr)
continue;
addr4.s_addr = htonl(addr);
m4 = find_map4(&addr4);
if (m4 == &pool->map4) {
d = alloc_map_dynamic(addr6, &addr4, f);
if (!d)
return NULL;
print_dyn_change("assigned new", d);
gcfg->map_write_pending = 1;
goto activate;
}
}
if (list_empty(&pool->dormant_list))
return NULL;
d = list_entry(pool->dormant_list.prev, struct map_dynamic, list);
d->map6.addr = *addr6;
print_dyn_change("reassigned dormant", d);
gcfg->map_write_pending = 1;
activate:
move_to_mapped(d, pool);
return &d->map6;
}
static void load_map(struct dynamic_pool *pool, const struct in6_addr *addr6,
const struct in_addr *addr4, long int last_use)
{
struct list_head *entry;
struct free_addr *f;
uint32_t addr;
struct map4 *m4;
struct map_dynamic *d;
char addrbuf4[INET_ADDRSTRLEN];
char addrbuf6[INET6_ADDRSTRLEN];
if (pool->map4.addr.s_addr != (addr4->s_addr &
pool->map4.mask.s_addr)) {
inet_ntop(AF_INET, addr4, addrbuf4, sizeof(addrbuf4));
slog(LOG_NOTICE, "Ignoring map for %s from %s/%s that lies "
"outside dynamic pool prefix\n", addrbuf4,
gcfg->data_dir, MAP_FILE);
return;
}
m4 = find_map4(addr4);
if (m4 != &pool->map4) {
inet_ntop(AF_INET, addr4, addrbuf4, sizeof(addrbuf4));
slog(LOG_NOTICE, "Ignoring map for %s from %s/%s that "
"conflicts with statically-configured map\n",
addrbuf4, gcfg->data_dir, MAP_FILE);
return;
}
if (validate_ip6_addr(addr6) < 0) {
inet_ntop(AF_INET, addr4, addrbuf4, sizeof(addrbuf4));
inet_ntop(AF_INET6, addr6, addrbuf6, sizeof(addrbuf6));
slog(LOG_NOTICE, "Ignoring map for %s from %s/%s with "
"invalid IPv6 address %s\n", addrbuf4,
gcfg->data_dir, MAP_FILE, addrbuf6);
return;
}
if (find_map6(addr6)) {
inet_ntop(AF_INET6, addr6, addrbuf6, sizeof(addrbuf6));
slog(LOG_NOTICE, "Ignoring map for %s from %s/%s that "
"conflicts with statically-configured map\n",
addrbuf6, gcfg->data_dir, MAP_FILE);
return;
}
addr = ntohl(addr4->s_addr);
list_for_each(entry, &pool->free_list) {
f = list_entry(entry, struct free_addr, list);
if (f->addr + f->count >= addr)
break;
}
if (entry == &pool->free_list || f->addr >= addr) {
inet_ntop(AF_INET, addr4, addrbuf4, sizeof(addrbuf4));
slog(LOG_NOTICE, "Ignoring duplicate map for %s from %s/%s\n",
addrbuf4, gcfg->data_dir, MAP_FILE);
return;
}
d = alloc_map_dynamic(addr6, addr4, f);
if (!d)
return;
d->last_use = last_use;
move_to_dormant(d, pool);
}
void load_dynamic(struct dynamic_pool *pool)
{
FILE *in;
char line[512];
char *s4, *s6, *stime, *end, *tokptr;
struct in_addr addr4;
struct in6_addr addr6;
long int last_use;
struct list_head *entry;
struct map_dynamic *d;
int count = 0;
in = fopen(MAP_FILE, "r");
if (!in) {
if (errno != ENOENT)
slog(LOG_ERR, "Unable to open %s/%s, ignoring: %s\n",
gcfg->data_dir, MAP_FILE,
strerror(errno));
return;
}
while (fgets(line, sizeof(line), in)) {
if (strlen(line) + 1 == sizeof(line)) {
slog(LOG_ERR, "Ignoring oversized line in %s/%s\n",
gcfg->data_dir, MAP_FILE);
continue;
}
s4 = strtok_r(line, DELIM, &tokptr);
if (!s4 || *s4 == '#')
continue;
s6 = strtok_r(NULL, DELIM, &tokptr);
if (!s6)
goto malformed;
stime = strtok_r(NULL, DELIM, &tokptr);
if (!stime)
goto malformed;
end = strtok_r(NULL, DELIM, &tokptr);
if (end)
goto malformed;
if (!inet_pton(AF_INET, s4, &addr4) ||
!inet_pton(AF_INET6, s6, &addr6))
goto malformed;
last_use = strtol(stime, &end, 10);
if (last_use <= 0 || *end)
goto malformed;
load_map(pool, &addr6, &addr4, last_use);
continue;
malformed:
slog(LOG_ERR, "Ignoring malformed line in %s/%s\n",
gcfg->data_dir, MAP_FILE);
}
fclose(in);
time(&now);
last_use = 0;
list_for_each(entry, &pool->dormant_list) {
d = list_entry(entry, struct map_dynamic, list);
if (d->last_use > last_use)
last_use = d->last_use;
++count;
}
slog(LOG_INFO, "Loaded %d dynamic %s from %s/%s\n", count,
count == 1 ? "map" : "maps",
gcfg->data_dir, MAP_FILE);
if (last_use > now) {
slog(LOG_DEBUG, "Note: maps in %s/%s are dated in the future\n",
gcfg->data_dir, MAP_FILE);
list_for_each(entry, &pool->dormant_list) {
d = list_entry(entry, struct map_dynamic, list);
d->last_use = now - gcfg->dyn_min_lease;
}
} else {
while (!list_empty(&pool->dormant_list)) {
d = list_entry(pool->dormant_list.next,
struct map_dynamic, list);
if (d->last_use + gcfg->dyn_min_lease < now)
break;
move_to_mapped(d, pool);
}
}
}
static void write_to_file(struct dynamic_pool *pool)
{
FILE *out;
struct list_head *entry;
struct map_dynamic *d;
char addrbuf4[INET_ADDRSTRLEN];
char addrbuf6[INET6_ADDRSTRLEN];
out = fopen(TMP_MAP_FILE, "w");
if (!out) {
slog(LOG_ERR, "Unable to open %s/%s for writing: %s\n",
gcfg->data_dir, TMP_MAP_FILE,
strerror(errno));
return;
}
fprintf(out, "###\n###\n### TAYGA dynamic map database\n###\n"
"### You can edit this (carefully!) as long as "
"you shut down TAYGA first\n###\n###\n"
"### Last written: %s###\n###\n\n",
asctime(gmtime(&now)));
entry = pool->mapped_list.next;
while (entry != &pool->dormant_list) {
if (entry == &pool->mapped_list) {
entry = pool->dormant_list.next;
continue;
}
d = list_entry(entry, struct map_dynamic, list);
inet_ntop(AF_INET, &d->map4.addr, addrbuf4, sizeof(addrbuf4));
inet_ntop(AF_INET6, &d->map6.addr, addrbuf6, sizeof(addrbuf6));
fprintf(out, "%s\t%s\t%ld\n", addrbuf4, addrbuf6,
d->cache_entry ?
d->cache_entry->last_use : d->last_use);
entry = entry->next;
}
fclose(out);
if (rename(TMP_MAP_FILE, MAP_FILE) < 0) {
slog(LOG_ERR, "Unable to rename %s/%s to %s/%s: %s\n",
gcfg->data_dir, TMP_MAP_FILE,
gcfg->data_dir, MAP_FILE,
strerror(errno));
unlink(TMP_MAP_FILE);
}
}
void dynamic_maint(struct dynamic_pool *pool, int shutdown)
{
struct list_head *entry, *next;
struct map_dynamic *d;
struct free_addr *f;
list_for_each_safe(entry, next, &pool->mapped_list) {
d = list_entry(entry, struct map_dynamic, list);
if (d->cache_entry)
continue;
if (d->last_use + gcfg->dyn_min_lease < now) {
print_dyn_change("unmapped dormant", d);
move_to_dormant(d, pool);
}
}
while (!list_empty(&pool->dormant_list)) {
d = list_entry(pool->dormant_list.prev,
struct map_dynamic, list);
if (d->last_use + gcfg->dyn_max_lease >= now)
break;
f = list_entry(d->free.list.prev, struct free_addr, list);
f->count += d->free.count + 1;
list_del(&d->free.list);
list_del(&d->list);
free(d);
}
if (gcfg->data_dir[0]) {
if (shutdown || gcfg->map_write_pending ||
gcfg->last_map_write +
gcfg->max_commit_delay < now ||
gcfg->last_map_write > now) {
write_to_file(pool);
gcfg->last_map_write = now;
gcfg->map_write_pending = 0;
}
}
}

520
install-sh Executable file
View File

@ -0,0 +1,520 @@
#!/bin/sh
# install - install a program, script, or datafile
scriptversion=2009-04-28.21; # UTC
# This originates from X11R5 (mit/util/scripts/install.sh), which was
# later released in X11R6 (xc/config/util/install.sh) with the
# following copyright and license.
#
# Copyright (C) 1994 X Consortium
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
# AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNEC-
# TION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
# Except as contained in this notice, the name of the X Consortium shall not
# be used in advertising or otherwise to promote the sale, use or other deal-
# ings in this Software without prior written authorization from the X Consor-
# tium.
#
#
# FSF changes to this file are in the public domain.
#
# Calling this script install-sh is preferred over install.sh, to prevent
# `make' implicit rules from creating a file called install from it
# when there is no Makefile.
#
# This script is compatible with the BSD install script, but was written
# from scratch.
nl='
'
IFS=" "" $nl"
# set DOITPROG to echo to test this script
# Don't use :- since 4.3BSD and earlier shells don't like it.
doit=${DOITPROG-}
if test -z "$doit"; then
doit_exec=exec
else
doit_exec=$doit
fi
# Put in absolute file names if you don't have them in your path;
# or use environment vars.
chgrpprog=${CHGRPPROG-chgrp}
chmodprog=${CHMODPROG-chmod}
chownprog=${CHOWNPROG-chown}
cmpprog=${CMPPROG-cmp}
cpprog=${CPPROG-cp}
mkdirprog=${MKDIRPROG-mkdir}
mvprog=${MVPROG-mv}
rmprog=${RMPROG-rm}
stripprog=${STRIPPROG-strip}
posix_glob='?'
initialize_posix_glob='
test "$posix_glob" != "?" || {
if (set -f) 2>/dev/null; then
posix_glob=
else
posix_glob=:
fi
}
'
posix_mkdir=
# Desired mode of installed file.
mode=0755
chgrpcmd=
chmodcmd=$chmodprog
chowncmd=
mvcmd=$mvprog
rmcmd="$rmprog -f"
stripcmd=
src=
dst=
dir_arg=
dst_arg=
copy_on_change=false
no_target_directory=
usage="\
Usage: $0 [OPTION]... [-T] SRCFILE DSTFILE
or: $0 [OPTION]... SRCFILES... DIRECTORY
or: $0 [OPTION]... -t DIRECTORY SRCFILES...
or: $0 [OPTION]... -d DIRECTORIES...
In the 1st form, copy SRCFILE to DSTFILE.
In the 2nd and 3rd, copy all SRCFILES to DIRECTORY.
In the 4th, create DIRECTORIES.
Options:
--help display this help and exit.
--version display version info and exit.
-c (ignored)
-C install only if different (preserve the last data modification time)
-d create directories instead of installing files.
-g GROUP $chgrpprog installed files to GROUP.
-m MODE $chmodprog installed files to MODE.
-o USER $chownprog installed files to USER.
-s $stripprog installed files.
-t DIRECTORY install into DIRECTORY.
-T report an error if DSTFILE is a directory.
Environment variables override the default commands:
CHGRPPROG CHMODPROG CHOWNPROG CMPPROG CPPROG MKDIRPROG MVPROG
RMPROG STRIPPROG
"
while test $# -ne 0; do
case $1 in
-c) ;;
-C) copy_on_change=true;;
-d) dir_arg=true;;
-g) chgrpcmd="$chgrpprog $2"
shift;;
--help) echo "$usage"; exit $?;;
-m) mode=$2
case $mode in
*' '* | *' '* | *'
'* | *'*'* | *'?'* | *'['*)
echo "$0: invalid mode: $mode" >&2
exit 1;;
esac
shift;;
-o) chowncmd="$chownprog $2"
shift;;
-s) stripcmd=$stripprog;;
-t) dst_arg=$2
shift;;
-T) no_target_directory=true;;
--version) echo "$0 $scriptversion"; exit $?;;
--) shift
break;;
-*) echo "$0: invalid option: $1" >&2
exit 1;;
*) break;;
esac
shift
done
if test $# -ne 0 && test -z "$dir_arg$dst_arg"; then
# When -d is used, all remaining arguments are directories to create.
# When -t is used, the destination is already specified.
# Otherwise, the last argument is the destination. Remove it from $@.
for arg
do
if test -n "$dst_arg"; then
# $@ is not empty: it contains at least $arg.
set fnord "$@" "$dst_arg"
shift # fnord
fi
shift # arg
dst_arg=$arg
done
fi
if test $# -eq 0; then
if test -z "$dir_arg"; then
echo "$0: no input file specified." >&2
exit 1
fi
# It's OK to call `install-sh -d' without argument.
# This can happen when creating conditional directories.
exit 0
fi
if test -z "$dir_arg"; then
trap '(exit $?); exit' 1 2 13 15
# Set umask so as not to create temps with too-generous modes.
# However, 'strip' requires both read and write access to temps.
case $mode in
# Optimize common cases.
*644) cp_umask=133;;
*755) cp_umask=22;;
*[0-7])
if test -z "$stripcmd"; then
u_plus_rw=
else
u_plus_rw='% 200'
fi
cp_umask=`expr '(' 777 - $mode % 1000 ')' $u_plus_rw`;;
*)
if test -z "$stripcmd"; then
u_plus_rw=
else
u_plus_rw=,u+rw
fi
cp_umask=$mode$u_plus_rw;;
esac
fi
for src
do
# Protect names starting with `-'.
case $src in
-*) src=./$src;;
esac
if test -n "$dir_arg"; then
dst=$src
dstdir=$dst
test -d "$dstdir"
dstdir_status=$?
else
# Waiting for this to be detected by the "$cpprog $src $dsttmp" command
# might cause directories to be created, which would be especially bad
# if $src (and thus $dsttmp) contains '*'.
if test ! -f "$src" && test ! -d "$src"; then
echo "$0: $src does not exist." >&2
exit 1
fi
if test -z "$dst_arg"; then
echo "$0: no destination specified." >&2
exit 1
fi
dst=$dst_arg
# Protect names starting with `-'.
case $dst in
-*) dst=./$dst;;
esac
# If destination is a directory, append the input filename; won't work
# if double slashes aren't ignored.
if test -d "$dst"; then
if test -n "$no_target_directory"; then
echo "$0: $dst_arg: Is a directory" >&2
exit 1
fi
dstdir=$dst
dst=$dstdir/`basename "$src"`
dstdir_status=0
else
# Prefer dirname, but fall back on a substitute if dirname fails.
dstdir=`
(dirname "$dst") 2>/dev/null ||
expr X"$dst" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
X"$dst" : 'X\(//\)[^/]' \| \
X"$dst" : 'X\(//\)$' \| \
X"$dst" : 'X\(/\)' \| . 2>/dev/null ||
echo X"$dst" |
sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
s//\1/
q
}
/^X\(\/\/\)[^/].*/{
s//\1/
q
}
/^X\(\/\/\)$/{
s//\1/
q
}
/^X\(\/\).*/{
s//\1/
q
}
s/.*/./; q'
`
test -d "$dstdir"
dstdir_status=$?
fi
fi
obsolete_mkdir_used=false
if test $dstdir_status != 0; then
case $posix_mkdir in
'')
# Create intermediate dirs using mode 755 as modified by the umask.
# This is like FreeBSD 'install' as of 1997-10-28.
umask=`umask`
case $stripcmd.$umask in
# Optimize common cases.
*[2367][2367]) mkdir_umask=$umask;;
.*0[02][02] | .[02][02] | .[02]) mkdir_umask=22;;
*[0-7])
mkdir_umask=`expr $umask + 22 \
- $umask % 100 % 40 + $umask % 20 \
- $umask % 10 % 4 + $umask % 2
`;;
*) mkdir_umask=$umask,go-w;;
esac
# With -d, create the new directory with the user-specified mode.
# Otherwise, rely on $mkdir_umask.
if test -n "$dir_arg"; then
mkdir_mode=-m$mode
else
mkdir_mode=
fi
posix_mkdir=false
case $umask in
*[123567][0-7][0-7])
# POSIX mkdir -p sets u+wx bits regardless of umask, which
# is incompatible with FreeBSD 'install' when (umask & 300) != 0.
;;
*)
tmpdir=${TMPDIR-/tmp}/ins$RANDOM-$$
trap 'ret=$?; rmdir "$tmpdir/d" "$tmpdir" 2>/dev/null; exit $ret' 0
if (umask $mkdir_umask &&
exec $mkdirprog $mkdir_mode -p -- "$tmpdir/d") >/dev/null 2>&1
then
if test -z "$dir_arg" || {
# Check for POSIX incompatibilities with -m.
# HP-UX 11.23 and IRIX 6.5 mkdir -m -p sets group- or
# other-writeable bit of parent directory when it shouldn't.
# FreeBSD 6.1 mkdir -m -p sets mode of existing directory.
ls_ld_tmpdir=`ls -ld "$tmpdir"`
case $ls_ld_tmpdir in
d????-?r-*) different_mode=700;;
d????-?--*) different_mode=755;;
*) false;;
esac &&
$mkdirprog -m$different_mode -p -- "$tmpdir" && {
ls_ld_tmpdir_1=`ls -ld "$tmpdir"`
test "$ls_ld_tmpdir" = "$ls_ld_tmpdir_1"
}
}
then posix_mkdir=:
fi
rmdir "$tmpdir/d" "$tmpdir"
else
# Remove any dirs left behind by ancient mkdir implementations.
rmdir ./$mkdir_mode ./-p ./-- 2>/dev/null
fi
trap '' 0;;
esac;;
esac
if
$posix_mkdir && (
umask $mkdir_umask &&
$doit_exec $mkdirprog $mkdir_mode -p -- "$dstdir"
)
then :
else
# The umask is ridiculous, or mkdir does not conform to POSIX,
# or it failed possibly due to a race condition. Create the
# directory the slow way, step by step, checking for races as we go.
case $dstdir in
/*) prefix='/';;
-*) prefix='./';;
*) prefix='';;
esac
eval "$initialize_posix_glob"
oIFS=$IFS
IFS=/
$posix_glob set -f
set fnord $dstdir
shift
$posix_glob set +f
IFS=$oIFS
prefixes=
for d
do
test -z "$d" && continue
prefix=$prefix$d
if test -d "$prefix"; then
prefixes=
else
if $posix_mkdir; then
(umask=$mkdir_umask &&
$doit_exec $mkdirprog $mkdir_mode -p -- "$dstdir") && break
# Don't fail if two instances are running concurrently.
test -d "$prefix" || exit 1
else
case $prefix in
*\'*) qprefix=`echo "$prefix" | sed "s/'/'\\\\\\\\''/g"`;;
*) qprefix=$prefix;;
esac
prefixes="$prefixes '$qprefix'"
fi
fi
prefix=$prefix/
done
if test -n "$prefixes"; then
# Don't fail if two instances are running concurrently.
(umask $mkdir_umask &&
eval "\$doit_exec \$mkdirprog $prefixes") ||
test -d "$dstdir" || exit 1
obsolete_mkdir_used=true
fi
fi
fi
if test -n "$dir_arg"; then
{ test -z "$chowncmd" || $doit $chowncmd "$dst"; } &&
{ test -z "$chgrpcmd" || $doit $chgrpcmd "$dst"; } &&
{ test "$obsolete_mkdir_used$chowncmd$chgrpcmd" = false ||
test -z "$chmodcmd" || $doit $chmodcmd $mode "$dst"; } || exit 1
else
# Make a couple of temp file names in the proper directory.
dsttmp=$dstdir/_inst.$$_
rmtmp=$dstdir/_rm.$$_
# Trap to clean up those temp files at exit.
trap 'ret=$?; rm -f "$dsttmp" "$rmtmp" && exit $ret' 0
# Copy the file name to the temp name.
(umask $cp_umask && $doit_exec $cpprog "$src" "$dsttmp") &&
# and set any options; do chmod last to preserve setuid bits.
#
# If any of these fail, we abort the whole thing. If we want to
# ignore errors from any of these, just make sure not to ignore
# errors from the above "$doit $cpprog $src $dsttmp" command.
#
{ test -z "$chowncmd" || $doit $chowncmd "$dsttmp"; } &&
{ test -z "$chgrpcmd" || $doit $chgrpcmd "$dsttmp"; } &&
{ test -z "$stripcmd" || $doit $stripcmd "$dsttmp"; } &&
{ test -z "$chmodcmd" || $doit $chmodcmd $mode "$dsttmp"; } &&
# If -C, don't bother to copy if it wouldn't change the file.
if $copy_on_change &&
old=`LC_ALL=C ls -dlL "$dst" 2>/dev/null` &&
new=`LC_ALL=C ls -dlL "$dsttmp" 2>/dev/null` &&
eval "$initialize_posix_glob" &&
$posix_glob set -f &&
set X $old && old=:$2:$4:$5:$6 &&
set X $new && new=:$2:$4:$5:$6 &&
$posix_glob set +f &&
test "$old" = "$new" &&
$cmpprog "$dst" "$dsttmp" >/dev/null 2>&1
then
rm -f "$dsttmp"
else
# Rename the file to the real destination.
$doit $mvcmd -f "$dsttmp" "$dst" 2>/dev/null ||
# The rename failed, perhaps because mv can't rename something else
# to itself, or perhaps because mv is so ancient that it does not
# support -f.
{
# Now remove or move aside any old file at destination location.
# We try this two ways since rm can't unlink itself on some
# systems and the destination file might be busy for other
# reasons. In this case, the final cleanup might fail but the new
# file should still install successfully.
{
test ! -f "$dst" ||
$doit $rmcmd -f "$dst" 2>/dev/null ||
{ $doit $mvcmd -f "$dst" "$rmtmp" 2>/dev/null &&
{ $doit $rmcmd -f "$rmtmp" 2>/dev/null; :; }
} ||
{ echo "$0: cannot unlink or rename $dst" >&2
(exit 1); exit 1
}
} &&
# Now rename the file to the real destination.
$doit $mvcmd "$dsttmp" "$dst"
}
fi || exit 1
trap '' 0
fi
done
# Local variables:
# eval: (add-hook 'write-file-hooks 'time-stamp)
# time-stamp-start: "scriptversion="
# time-stamp-format: "%:y-%02m-%02d.%02H"
# time-stamp-time-zone: "UTC"
# time-stamp-end: "; # UTC"
# End:

80
list.h Normal file
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@ -0,0 +1,80 @@
/* Linux-style linked list implementation */
#ifndef __LIST_H__
#define __LIST_H__
#include <stddef.h> /* for offsetof() macro */
struct list_head {
struct list_head *next;
struct list_head *prev;
};
/* Declare an empty list */
#define LIST_HEAD(x) struct list_head x = { &x, &x }
/* Initialize an empty list (required for all malloc'd list_heads) */
static inline void INIT_LIST_HEAD(struct list_head *x)
{
x->next = x;
x->prev = x;
}
/* Remove an entry from its current list (if any) and insert it into the
* beginning of the given list */
static inline void list_add(struct list_head *x, struct list_head *head)
{
x->next->prev = x->prev;
x->prev->next = x->next;
x->next = head->next;
x->prev = head;
head->next = x;
x->next->prev = x;
}
/* Remove an entry from its current list (if any) and insert it into the
* end of the given list */
static inline void list_add_tail(struct list_head *x, struct list_head *head)
{
x->next->prev = x->prev;
x->prev->next = x->next;
x->prev = head->prev;
x->next = head;
head->prev = x;
x->prev->next = x;
}
/* Remove an entry from its current list and reinitialize it */
static inline void list_del(struct list_head *x)
{
x->next->prev = x->prev;
x->prev->next = x->next;
x->next = x;
x->prev = x;
}
#define list_del_init list_del
#define list_move list_add
#define list_move_tail list_add_tail
/* Test if list is empty (contains no other entries) */
static inline int list_empty(const struct list_head *x)
{
return x->next == x;
}
/* Get a pointer to the object containing x, which is of type "type" and
* embeds x as a field called "field" */
#define list_entry(x, type, field) ({ \
const typeof( ((type *)0)->field ) *__mptr = (x); \
(type *)( (char *)__mptr - offsetof(type, field) );})
/* Iterate over all items in the list */
#define list_for_each(x, head) \
for (x = (head)->next; x != (head); x = x->next)
/* Iterate over all items in the list, possibly deleting some */
#define list_for_each_safe(x, n, head) \
for (x = (head)->next, n = x->next; x != (head); x = n, n = x->next)
#endif /* __LIST_H__ */

376
missing Executable file
View File

@ -0,0 +1,376 @@
#! /bin/sh
# Common stub for a few missing GNU programs while installing.
scriptversion=2009-04-28.21; # UTC
# Copyright (C) 1996, 1997, 1999, 2000, 2002, 2003, 2004, 2005, 2006,
# 2008, 2009 Free Software Foundation, Inc.
# Originally by Fran,cois Pinard <pinard@iro.umontreal.ca>, 1996.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# As a special exception to the GNU General Public License, if you
# distribute this file as part of a program that contains a
# configuration script generated by Autoconf, you may include it under
# the same distribution terms that you use for the rest of that program.
if test $# -eq 0; then
echo 1>&2 "Try \`$0 --help' for more information"
exit 1
fi
run=:
sed_output='s/.* --output[ =]\([^ ]*\).*/\1/p'
sed_minuso='s/.* -o \([^ ]*\).*/\1/p'
# In the cases where this matters, `missing' is being run in the
# srcdir already.
if test -f configure.ac; then
configure_ac=configure.ac
else
configure_ac=configure.in
fi
msg="missing on your system"
case $1 in
--run)
# Try to run requested program, and just exit if it succeeds.
run=
shift
"$@" && exit 0
# Exit code 63 means version mismatch. This often happens
# when the user try to use an ancient version of a tool on
# a file that requires a minimum version. In this case we
# we should proceed has if the program had been absent, or
# if --run hadn't been passed.
if test $? = 63; then
run=:
msg="probably too old"
fi
;;
-h|--h|--he|--hel|--help)
echo "\
$0 [OPTION]... PROGRAM [ARGUMENT]...
Handle \`PROGRAM [ARGUMENT]...' for when PROGRAM is missing, or return an
error status if there is no known handling for PROGRAM.
Options:
-h, --help display this help and exit
-v, --version output version information and exit
--run try to run the given command, and emulate it if it fails
Supported PROGRAM values:
aclocal touch file \`aclocal.m4'
autoconf touch file \`configure'
autoheader touch file \`config.h.in'
autom4te touch the output file, or create a stub one
automake touch all \`Makefile.in' files
bison create \`y.tab.[ch]', if possible, from existing .[ch]
flex create \`lex.yy.c', if possible, from existing .c
help2man touch the output file
lex create \`lex.yy.c', if possible, from existing .c
makeinfo touch the output file
tar try tar, gnutar, gtar, then tar without non-portable flags
yacc create \`y.tab.[ch]', if possible, from existing .[ch]
Version suffixes to PROGRAM as well as the prefixes \`gnu-', \`gnu', and
\`g' are ignored when checking the name.
Send bug reports to <bug-automake@gnu.org>."
exit $?
;;
-v|--v|--ve|--ver|--vers|--versi|--versio|--version)
echo "missing $scriptversion (GNU Automake)"
exit $?
;;
-*)
echo 1>&2 "$0: Unknown \`$1' option"
echo 1>&2 "Try \`$0 --help' for more information"
exit 1
;;
esac
# normalize program name to check for.
program=`echo "$1" | sed '
s/^gnu-//; t
s/^gnu//; t
s/^g//; t'`
# Now exit if we have it, but it failed. Also exit now if we
# don't have it and --version was passed (most likely to detect
# the program). This is about non-GNU programs, so use $1 not
# $program.
case $1 in
lex*|yacc*)
# Not GNU programs, they don't have --version.
;;
tar*)
if test -n "$run"; then
echo 1>&2 "ERROR: \`tar' requires --run"
exit 1
elif test "x$2" = "x--version" || test "x$2" = "x--help"; then
exit 1
fi
;;
*)
if test -z "$run" && ($1 --version) > /dev/null 2>&1; then
# We have it, but it failed.
exit 1
elif test "x$2" = "x--version" || test "x$2" = "x--help"; then
# Could not run --version or --help. This is probably someone
# running `$TOOL --version' or `$TOOL --help' to check whether
# $TOOL exists and not knowing $TOOL uses missing.
exit 1
fi
;;
esac
# If it does not exist, or fails to run (possibly an outdated version),
# try to emulate it.
case $program in
aclocal*)
echo 1>&2 "\
WARNING: \`$1' is $msg. You should only need it if
you modified \`acinclude.m4' or \`${configure_ac}'. You might want
to install the \`Automake' and \`Perl' packages. Grab them from
any GNU archive site."
touch aclocal.m4
;;
autoconf*)
echo 1>&2 "\
WARNING: \`$1' is $msg. You should only need it if
you modified \`${configure_ac}'. You might want to install the
\`Autoconf' and \`GNU m4' packages. Grab them from any GNU
archive site."
touch configure
;;
autoheader*)
echo 1>&2 "\
WARNING: \`$1' is $msg. You should only need it if
you modified \`acconfig.h' or \`${configure_ac}'. You might want
to install the \`Autoconf' and \`GNU m4' packages. Grab them
from any GNU archive site."
files=`sed -n 's/^[ ]*A[CM]_CONFIG_HEADER(\([^)]*\)).*/\1/p' ${configure_ac}`
test -z "$files" && files="config.h"
touch_files=
for f in $files; do
case $f in
*:*) touch_files="$touch_files "`echo "$f" |
sed -e 's/^[^:]*://' -e 's/:.*//'`;;
*) touch_files="$touch_files $f.in";;
esac
done
touch $touch_files
;;
automake*)
echo 1>&2 "\
WARNING: \`$1' is $msg. You should only need it if
you modified \`Makefile.am', \`acinclude.m4' or \`${configure_ac}'.
You might want to install the \`Automake' and \`Perl' packages.
Grab them from any GNU archive site."
find . -type f -name Makefile.am -print |
sed 's/\.am$/.in/' |
while read f; do touch "$f"; done
;;
autom4te*)
echo 1>&2 "\
WARNING: \`$1' is needed, but is $msg.
You might have modified some files without having the
proper tools for further handling them.
You can get \`$1' as part of \`Autoconf' from any GNU
archive site."
file=`echo "$*" | sed -n "$sed_output"`
test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
if test -f "$file"; then
touch $file
else
test -z "$file" || exec >$file
echo "#! /bin/sh"
echo "# Created by GNU Automake missing as a replacement of"
echo "# $ $@"
echo "exit 0"
chmod +x $file
exit 1
fi
;;
bison*|yacc*)
echo 1>&2 "\
WARNING: \`$1' $msg. You should only need it if
you modified a \`.y' file. You may need the \`Bison' package
in order for those modifications to take effect. You can get
\`Bison' from any GNU archive site."
rm -f y.tab.c y.tab.h
if test $# -ne 1; then
eval LASTARG="\${$#}"
case $LASTARG in
*.y)
SRCFILE=`echo "$LASTARG" | sed 's/y$/c/'`
if test -f "$SRCFILE"; then
cp "$SRCFILE" y.tab.c
fi
SRCFILE=`echo "$LASTARG" | sed 's/y$/h/'`
if test -f "$SRCFILE"; then
cp "$SRCFILE" y.tab.h
fi
;;
esac
fi
if test ! -f y.tab.h; then
echo >y.tab.h
fi
if test ! -f y.tab.c; then
echo 'main() { return 0; }' >y.tab.c
fi
;;
lex*|flex*)
echo 1>&2 "\
WARNING: \`$1' is $msg. You should only need it if
you modified a \`.l' file. You may need the \`Flex' package
in order for those modifications to take effect. You can get
\`Flex' from any GNU archive site."
rm -f lex.yy.c
if test $# -ne 1; then
eval LASTARG="\${$#}"
case $LASTARG in
*.l)
SRCFILE=`echo "$LASTARG" | sed 's/l$/c/'`
if test -f "$SRCFILE"; then
cp "$SRCFILE" lex.yy.c
fi
;;
esac
fi
if test ! -f lex.yy.c; then
echo 'main() { return 0; }' >lex.yy.c
fi
;;
help2man*)
echo 1>&2 "\
WARNING: \`$1' is $msg. You should only need it if
you modified a dependency of a manual page. You may need the
\`Help2man' package in order for those modifications to take
effect. You can get \`Help2man' from any GNU archive site."
file=`echo "$*" | sed -n "$sed_output"`
test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
if test -f "$file"; then
touch $file
else
test -z "$file" || exec >$file
echo ".ab help2man is required to generate this page"
exit $?
fi
;;
makeinfo*)
echo 1>&2 "\
WARNING: \`$1' is $msg. You should only need it if
you modified a \`.texi' or \`.texinfo' file, or any other file
indirectly affecting the aspect of the manual. The spurious
call might also be the consequence of using a buggy \`make' (AIX,
DU, IRIX). You might want to install the \`Texinfo' package or
the \`GNU make' package. Grab either from any GNU archive site."
# The file to touch is that specified with -o ...
file=`echo "$*" | sed -n "$sed_output"`
test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
if test -z "$file"; then
# ... or it is the one specified with @setfilename ...
infile=`echo "$*" | sed 's/.* \([^ ]*\) *$/\1/'`
file=`sed -n '
/^@setfilename/{
s/.* \([^ ]*\) *$/\1/
p
q
}' $infile`
# ... or it is derived from the source name (dir/f.texi becomes f.info)
test -z "$file" && file=`echo "$infile" | sed 's,.*/,,;s,.[^.]*$,,'`.info
fi
# If the file does not exist, the user really needs makeinfo;
# let's fail without touching anything.
test -f $file || exit 1
touch $file
;;
tar*)
shift
# We have already tried tar in the generic part.
# Look for gnutar/gtar before invocation to avoid ugly error
# messages.
if (gnutar --version > /dev/null 2>&1); then
gnutar "$@" && exit 0
fi
if (gtar --version > /dev/null 2>&1); then
gtar "$@" && exit 0
fi
firstarg="$1"
if shift; then
case $firstarg in
*o*)
firstarg=`echo "$firstarg" | sed s/o//`
tar "$firstarg" "$@" && exit 0
;;
esac
case $firstarg in
*h*)
firstarg=`echo "$firstarg" | sed s/h//`
tar "$firstarg" "$@" && exit 0
;;
esac
fi
echo 1>&2 "\
WARNING: I can't seem to be able to run \`tar' with the given arguments.
You may want to install GNU tar or Free paxutils, or check the
command line arguments."
exit 1
;;
*)
echo 1>&2 "\
WARNING: \`$1' is needed, and is $msg.
You might have modified some files without having the
proper tools for further handling them. Check the \`README' file,
it often tells you about the needed prerequisites for installing
this package. You may also peek at any GNU archive site, in case
some other package would contain this missing \`$1' program."
exit 1
;;
esac
exit 0
# Local variables:
# eval: (add-hook 'write-file-hooks 'time-stamp)
# time-stamp-start: "scriptversion="
# time-stamp-format: "%:y-%02m-%02d.%02H"
# time-stamp-time-zone: "UTC"
# time-stamp-end: "; # UTC"
# End:

976
nat64.c Normal file
View File

@ -0,0 +1,976 @@
/*
* nat64.c -- IPv4/IPv6 header rewriting routines
*
* part of TAYGA <http://www.litech.org/tayga/>
* Copyright (C) 2010 Nathan Lutchansky <lutchann@litech.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <tayga.h>
extern struct config *gcfg;
static uint16_t ip_checksum(void *d, int c)
{
uint32_t sum = 0xffff;
uint16_t *p = d;
while (c > 1) {
sum += *p++;
c -= 2;
}
if (c)
sum += htons(*((uint8_t *)p) << 8);
while (sum > 0xffff)
sum = (sum & 0xffff) + (sum >> 16);
return ~sum;
}
static uint16_t ones_add(uint16_t a, uint16_t b)
{
uint32_t sum = (uint16_t)~a + (uint16_t)~b;
return ~((sum & 0xffff) + (sum >> 16));
}
static uint16_t ip6_checksum(struct ip6 *ip6, uint32_t data_len, uint8_t proto)
{
uint32_t sum = 0;
uint16_t *p;
int i;
for (i = 0, p = ip6->src.s6_addr16; i < 16; ++i)
sum += *p++;
sum += htonl(data_len) >> 16;
sum += htonl(data_len) & 0xffff;
sum += htons(proto);
while (sum > 0xffff)
sum = (sum & 0xffff) + (sum >> 16);
return ~sum;
}
static uint16_t convert_cksum(struct ip6 *ip6, struct ip4 *ip4)
{
uint32_t sum = 0;
uint16_t *p;
int i;
sum += ~ip4->src.s_addr >> 16;
sum += ~ip4->src.s_addr & 0xffff;
sum += ~ip4->dest.s_addr >> 16;
sum += ~ip4->dest.s_addr & 0xffff;
for (i = 0, p = ip6->src.s6_addr16; i < 16; ++i)
sum += *p++;
while (sum > 0xffff)
sum = (sum & 0xffff) + (sum >> 16);
return sum;
}
static void host_send_icmp4(uint8_t tos, struct in_addr *src,
struct in_addr *dest, struct icmp *icmp,
uint8_t *data, int data_len)
{
struct {
struct tun_pi pi;
struct ip4 ip4;
struct icmp icmp;
} __attribute__ ((__packed__)) header;
struct iovec iov[2];
header.pi.flags = 0;
header.pi.proto = htons(ETH_P_IP);
header.ip4.ver_ihl = 0x45;
header.ip4.tos = tos;
header.ip4.length = htons(sizeof(header.ip4) + sizeof(header.icmp) +
data_len);
header.ip4.ident = 0;
header.ip4.flags_offset = 0;
header.ip4.ttl = 64;
header.ip4.proto = 1;
header.ip4.cksum = 0;
header.ip4.src = *src;
header.ip4.dest = *dest;
header.ip4.cksum = ip_checksum(&header.ip4, sizeof(header.ip4));
header.icmp = *icmp;
header.icmp.cksum = 0;
header.icmp.cksum = ones_add(ip_checksum(data, data_len),
ip_checksum(&header.icmp, sizeof(header.icmp)));
iov[0].iov_base = &header;
iov[0].iov_len = sizeof(header);
iov[1].iov_base = data;
iov[1].iov_len = data_len;
if (writev(gcfg->tun_fd, iov, data_len ? 2 : 1) < 0)
slog(LOG_WARNING, "error writing packet to tun device: %s\n",
strerror(errno));
}
static void host_send_icmp4_error(uint8_t type, uint8_t code, uint32_t word,
struct pkt *orig)
{
struct icmp icmp;
int orig_len;
/* Don't send ICMP errors in response to ICMP messages other than
echo request */
if (orig->data_proto == 1 && orig->icmp->type != 8)
return;
orig_len = orig->header_len + orig->data_len;
if (orig_len > 576 - sizeof(struct ip4) - sizeof(struct icmp))
orig_len = 576 - sizeof(struct ip4) - sizeof(struct icmp);
icmp.type = type;
icmp.code = code;
icmp.word = htonl(word);
host_send_icmp4(0, &gcfg->local_addr4, &orig->ip4->src, &icmp,
(uint8_t *)orig->ip4, orig_len);
}
static void host_handle_icmp4(struct pkt *p)
{
p->data += sizeof(struct icmp);
p->data_len -= sizeof(struct icmp);
switch (p->icmp->type) {
case 8:
p->icmp->type = 0;
host_send_icmp4(p->ip4->tos, &p->ip4->dest, &p->ip4->src,
p->icmp, p->data, p->data_len);
break;
}
}
static void xlate_header_4to6(struct pkt *p, struct ip6 *ip6,
int payload_length)
{
ip6->ver_tc_fl = htonl((0x6 << 28) | (p->ip4->tos << 20));
ip6->payload_length = htons(payload_length);
ip6->next_header = p->data_proto == 1 ? 58 : p->data_proto;
ip6->hop_limit = p->ip4->ttl;
}
static int xlate_payload_4to6(struct pkt *p, struct ip6 *ip6)
{
uint16_t *tck;
uint16_t cksum;
if (p->ip4->flags_offset & htons(IP4_F_MASK))
return 0;
switch (p->data_proto) {
case 1:
cksum = ip6_checksum(ip6, htons(p->ip4->length) -
p->header_len, 58);
cksum = ones_add(p->icmp->cksum, cksum);
if (p->icmp->type == 8) {
p->icmp->type = 128;
p->icmp->cksum = ones_add(cksum, ~(128 - 8));
} else {
p->icmp->type = 129;
p->icmp->cksum = ones_add(cksum, ~(129 - 0));
}
return 0;
case 17:
if (p->data_len < 8)
return -1;
tck = (uint16_t *)(p->data + 6);
if (!*tck)
return -1; /* drop UDP packets with no checksum */
break;
case 6:
if (p->data_len < 20)
return -1;
tck = (uint16_t *)(p->data + 16);
break;
default:
return 0;
}
*tck = ones_add(*tck, ~convert_cksum(ip6, p->ip4));
return 0;
}
static void xlate_4to6_data(struct pkt *p)
{
struct {
struct tun_pi pi;
struct ip6 ip6;
struct ip6_frag ip6_frag;
} __attribute__ ((__packed__)) header;
struct cache_entry *src = NULL, *dest = NULL;
struct iovec iov[2];
int no_frag_hdr = 0;
uint16_t off = ntohs(p->ip4->flags_offset);
int frag_size;
frag_size = gcfg->ipv6_offlink_mtu;
if (frag_size > gcfg->mtu)
frag_size = gcfg->mtu;
frag_size -= sizeof(struct ip6);
if (map_ip4_to_ip6(&header.ip6.dest, &p->ip4->dest, &dest)) {
host_send_icmp4_error(3, 1, 0, p);
return;
}
if (map_ip4_to_ip6(&header.ip6.src, &p->ip4->src, &src)) {
host_send_icmp4_error(3, 10, 0, p);
return;
}
/* We do not respect the DF flag for IP4 packets that are already
fragmented, because the IP6 fragmentation header takes an extra
eight bytes, which we don't have space for because the IP4 source
thinks the MTU is only 20 bytes smaller than the actual MTU on
the IP6 side. (E.g. if the IP6 MTU is 1496, the IP4 source thinks
the path MTU is 1476, which means it sends fragments with 1456
bytes of fragmented payload. Translating this to IP6 requires
40 bytes of IP6 header + 8 bytes of fragmentation header +
1456 bytes of payload == 1504 bytes.) */
if ((off & (IP4_F_MASK | IP4_F_MF)) == 0) {
if (off & IP4_F_DF) {
if (gcfg->mtu - MTU_ADJ < p->header_len + p->data_len) {
host_send_icmp4_error(3, 4,
gcfg->mtu - MTU_ADJ, p);
return;
}
no_frag_hdr = 1;
} else if (gcfg->lazy_frag_hdr && p->data_len <= frag_size) {
no_frag_hdr = 1;
}
}
xlate_header_4to6(p, &header.ip6, p->data_len);
--header.ip6.hop_limit;
if (xlate_payload_4to6(p, &header.ip6) < 0)
return;
if (src)
src->flags |= CACHE_F_SEEN_4TO6;
if (dest)
dest->flags |= CACHE_F_SEEN_4TO6;
header.pi.flags = 0;
header.pi.proto = htons(ETH_P_IPV6);
if (no_frag_hdr) {
iov[0].iov_base = &header;
iov[0].iov_len = sizeof(struct tun_pi) + sizeof(struct ip6);
iov[1].iov_base = p->data;
iov[1].iov_len = p->data_len;
if (writev(gcfg->tun_fd, iov, 2) < 0)
slog(LOG_WARNING, "error writing packet to tun "
"device: %s\n", strerror(errno));
} else {
header.ip6_frag.next_header = header.ip6.next_header;
header.ip6_frag.reserved = 0;
header.ip6_frag.ident = htonl(ntohs(p->ip4->ident));
header.ip6.next_header = 44;
iov[0].iov_base = &header;
iov[0].iov_len = sizeof(header);
off = (off & IP4_F_MASK) * 8;
frag_size = (frag_size - sizeof(header.ip6_frag)) & ~7;
while (p->data_len > 0) {
if (p->data_len < frag_size)
frag_size = p->data_len;
header.ip6.payload_length =
htons(sizeof(struct ip6_frag) + frag_size);
header.ip6_frag.offset_flags = htons(off);
iov[1].iov_base = p->data;
iov[1].iov_len = frag_size;
p->data += frag_size;
p->data_len -= frag_size;
off += frag_size;
if (p->data_len || (p->ip4->flags_offset &
htons(IP4_F_MF)))
header.ip6_frag.offset_flags |= htons(IP6_F_MF);
if (writev(gcfg->tun_fd, iov, 2) < 0) {
slog(LOG_WARNING, "error writing packet to "
"tun device: %s\n",
strerror(errno));
return;
}
}
}
}
static int parse_ip4(struct pkt *p)
{
p->ip4 = (struct ip4 *)(p->data);
if (p->data_len < sizeof(struct ip4))
return -1;
p->header_len = (p->ip4->ver_ihl & 0x0f) * 4;
if ((p->ip4->ver_ihl >> 4) != 4 || p->header_len < sizeof(struct ip4) ||
p->data_len < p->header_len ||
ntohs(p->ip4->length) < p->header_len ||
validate_ip4_addr(&p->ip4->src) ||
validate_ip4_addr(&p->ip4->dest))
return -1;
if (p->data_len > ntohs(p->ip4->length))
p->data_len = ntohs(p->ip4->length);
p->data += p->header_len;
p->data_len -= p->header_len;
p->data_proto = p->ip4->proto;
if (p->data_proto == 1) {
if (p->ip4->flags_offset & htons(IP4_F_MASK | IP4_F_MF))
return -1; /* fragmented ICMP is unsupported */
if (p->data_len < sizeof(struct icmp))
return -1;
p->icmp = (struct icmp *)(p->data);
} else {
if ((p->ip4->flags_offset & htons(IP4_F_MF)) &&
(p->data_len & 0x7))
return -1;
if ((uint32_t)((ntohs(p->ip4->flags_offset) & IP4_F_MASK) * 8) +
p->data_len > 65535)
return -1;
}
return 0;
}
/* Estimates the most likely MTU of the link that the datagram in question was
* too large to fit through, using the algorithm from RFC 1191. */
static unsigned int est_mtu(unsigned int too_big)
{
static const unsigned int table[] = {
65535, 32000, 17914, 8166, 4352, 2002, 1492, 1006, 508, 296, 0
};
int i;
for (i = 0; table[i]; ++i)
if (too_big > table[i])
return table[i];
return 68;
}
static void xlate_4to6_icmp_error(struct pkt *p)
{
struct {
struct tun_pi pi;
struct ip6 ip6;
struct icmp icmp;
struct ip6 ip6_em;
} __attribute__ ((__packed__)) header;
struct iovec iov[2];
struct pkt p_em;
uint32_t mtu;
uint16_t em_len;
int allow_fake_source = 0;
struct cache_entry *orig_dest = NULL;
memset(&p_em, 0, sizeof(p_em));
p_em.data = p->data + sizeof(struct icmp);
p_em.data_len = p->data_len - sizeof(struct icmp);
if (p->icmp->type == 3 || p->icmp->type == 11 || p->icmp->type == 12) {
em_len = (ntohl(p->icmp->word) >> 14) & 0x3fc;
if (em_len) {
if (p_em.data_len < em_len)
return;
p_em.data_len = em_len;
}
}
if (parse_ip4(&p_em) < 0)
return;
if (p_em.data_proto == 1 && p_em.icmp->type != 8)
return;
if (sizeof(struct ip6) * 2 + sizeof(struct icmp) + p_em.data_len > 1280)
p_em.data_len = 1280 - sizeof(struct ip6) * 2 -
sizeof(struct icmp);
if (map_ip4_to_ip6(&header.ip6_em.src, &p_em.ip4->src, NULL) ||
map_ip4_to_ip6(&header.ip6_em.dest,
&p_em.ip4->dest, &orig_dest))
return;
xlate_header_4to6(&p_em, &header.ip6_em,
ntohs(p_em.ip4->length) - p_em.header_len);
switch (p->icmp->type) {
case 3: /* Destination Unreachable */
header.icmp.type = 1; /* Destination Unreachable */
header.icmp.word = 0;
switch (p->icmp->code) {
case 0: /* Network Unreachable */
case 1: /* Host Unreachable */
case 5: /* Source Route Failed */
case 6:
case 7:
case 8:
case 11:
case 12:
header.icmp.code = 0; /* No route to destination */
allow_fake_source = 1;
break;
case 2: /* Protocol Unreachable */
header.icmp.type = 4;
header.icmp.code = 1;
header.icmp.word = htonl(6);
break;
case 3: /* Port Unreachable */
header.icmp.code = 4; /* Port Unreachable */
break;
case 4: /* Fragmentation needed and DF set */
header.icmp.type = 2;
header.icmp.code = 0;
mtu = ntohl(p->icmp->word) & 0xffff;
if (mtu < 68)
mtu = est_mtu(ntohs(p_em.ip4->length));
mtu += MTU_ADJ;
if (mtu > gcfg->mtu)
mtu = gcfg->mtu;
if (mtu < 1280 && gcfg->allow_ident_gen && orig_dest) {
orig_dest->flags |= CACHE_F_GEN_IDENT;
mtu = 1280;
}
header.icmp.word = htonl(mtu);
allow_fake_source = 1;
break;
case 9:
case 10:
case 13:
case 15:
header.icmp.code = 1; /* Administratively prohibited */
break;
default:
return;
}
break;
case 11: /* Time Exceeded */
header.icmp.type = 3; /* Time Exceeded */
header.icmp.code = p->icmp->code;
header.icmp.word = 0;
break;
case 12: /* Parameter Problem */
if (p->icmp->code != 0 && p->icmp->code != 2)
return;
header.icmp.type = 4;
header.icmp.code = 0;
/* XXX do this and remove return */
return;
default:
return;
}
if (xlate_payload_4to6(&p_em, &header.ip6_em) < 0)
return;
if (map_ip4_to_ip6(&header.ip6.src, &p->ip4->src, NULL)) {
if (allow_fake_source)
header.ip6.src = gcfg->local_addr6;
else
return;
}
if (map_ip4_to_ip6(&header.ip6.dest, &p->ip4->dest, NULL))
return;
xlate_header_4to6(p, &header.ip6,
sizeof(header.icmp) + sizeof(header.ip6_em) + p_em.data_len);
--header.ip6.hop_limit;
header.icmp.cksum = 0;
header.icmp.cksum = ones_add(ip6_checksum(&header.ip6,
ntohs(header.ip6.payload_length), 58),
ones_add(ip_checksum(&header.icmp,
sizeof(header.icmp) +
sizeof(header.ip6_em)),
ip_checksum(p_em.data, p_em.data_len)));
header.pi.flags = 0;
header.pi.proto = htons(ETH_P_IPV6);
iov[0].iov_base = &header;
iov[0].iov_len = sizeof(header);
iov[1].iov_base = p_em.data;
iov[1].iov_len = p_em.data_len;
if (writev(gcfg->tun_fd, iov, 2) < 0)
slog(LOG_WARNING, "error writing packet to tun device: %s\n",
strerror(errno));
}
void handle_ip4(struct pkt *p)
{
if (parse_ip4(p) < 0 || p->ip4->ttl == 0 ||
ip_checksum(p->ip4, p->header_len) ||
p->header_len + p->data_len != ntohs(p->ip4->length))
return;
if (p->icmp && ip_checksum(p->data, p->data_len))
return;
if (p->ip4->dest.s_addr == gcfg->local_addr4.s_addr) {
if (p->data_proto == 1)
host_handle_icmp4(p);
else
host_send_icmp4_error(3, 2, 0, p);
} else {
if (p->ip4->ttl == 1) {
host_send_icmp4_error(11, 0, 0, p);
return;
}
if (p->data_proto != 1 || p->icmp->type == 8 ||
p->icmp->type == 0)
xlate_4to6_data(p);
else
xlate_4to6_icmp_error(p);
}
}
static void host_send_icmp6(uint8_t tc, struct in6_addr *src,
struct in6_addr *dest, struct icmp *icmp,
uint8_t *data, int data_len)
{
struct {
struct tun_pi pi;
struct ip6 ip6;
struct icmp icmp;
} __attribute__ ((__packed__)) header;
struct iovec iov[2];
header.pi.flags = 0;
header.pi.proto = htons(ETH_P_IPV6);
header.ip6.ver_tc_fl = htonl((0x6 << 28) | (tc << 20));
header.ip6.payload_length = htons(sizeof(header.icmp) + data_len);
header.ip6.next_header = 58;
header.ip6.hop_limit = 64;
header.ip6.src = *src;
header.ip6.dest = *dest;
header.icmp = *icmp;
header.icmp.cksum = 0;
header.icmp.cksum = ones_add(ip_checksum(data, data_len),
ip_checksum(&header.icmp, sizeof(header.icmp)));
header.icmp.cksum = ones_add(header.icmp.cksum,
ip6_checksum(&header.ip6,
data_len + sizeof(header.icmp), 58));
iov[0].iov_base = &header;
iov[0].iov_len = sizeof(header);
iov[1].iov_base = data;
iov[1].iov_len = data_len;
if (writev(gcfg->tun_fd, iov, data_len ? 2 : 1) < 0)
slog(LOG_WARNING, "error writing packet to tun device: %s\n",
strerror(errno));
}
static void host_send_icmp6_error(uint8_t type, uint8_t code, uint32_t word,
struct pkt *orig)
{
struct icmp icmp;
int orig_len;
/* Don't send ICMP errors in response to ICMP messages other than
echo request */
if (orig->data_proto == 58 && orig->icmp->type != 128)
return;
orig_len = sizeof(struct ip6) + orig->header_len + orig->data_len;
if (orig_len > 1280 - sizeof(struct ip6) - sizeof(struct icmp))
orig_len = 1280 - sizeof(struct ip6) - sizeof(struct icmp);
icmp.type = type;
icmp.code = code;
icmp.word = htonl(word);
host_send_icmp6(0, &gcfg->local_addr6, &orig->ip6->src, &icmp,
(uint8_t *)orig->ip6, orig_len);
}
static void host_handle_icmp6(struct pkt *p)
{
p->data += sizeof(struct icmp);
p->data_len -= sizeof(struct icmp);
switch (p->icmp->type) {
case 128:
p->icmp->type = 129;
host_send_icmp6((ntohl(p->ip6->ver_tc_fl) >> 20) & 0xff,
&p->ip6->dest, &p->ip6->src,
p->icmp, p->data, p->data_len);
break;
}
}
static void xlate_header_6to4(struct pkt *p, struct ip4 *ip4,
int payload_length, struct cache_entry *dest)
{
ip4->ver_ihl = 0x45;
ip4->tos = (ntohl(p->ip6->ver_tc_fl) >> 20) & 0xff;
ip4->length = htons(sizeof(struct ip4) + payload_length);
if (p->ip6_frag) {
ip4->ident = htons(ntohl(p->ip6_frag->ident) & 0xffff);
ip4->flags_offset =
htons(ntohs(p->ip6_frag->offset_flags) >> 3);
if (p->ip6_frag->offset_flags & htons(IP6_F_MF))
ip4->flags_offset |= htons(IP4_F_MF);
} else if (dest && (dest->flags & CACHE_F_GEN_IDENT) &&
p->header_len + payload_length <= 1280) {
ip4->ident = htons(dest->ip4_ident++);
ip4->flags_offset = 0;
if (dest->ip4_ident == 0)
dest->ip4_ident++;
} else {
ip4->ident = 0;
ip4->flags_offset = htons(IP4_F_DF);
}
ip4->ttl = p->ip6->hop_limit;
ip4->proto = p->data_proto == 58 ? 1 : p->data_proto;
ip4->cksum = 0;
}
static int xlate_payload_6to4(struct pkt *p, struct ip4 *ip4)
{
uint16_t *tck;
uint16_t cksum;
if (p->ip6_frag && (p->ip6_frag->offset_flags & ntohs(IP6_F_MASK)))
return 0;
switch (p->data_proto) {
case 58:
cksum = ~ip6_checksum(p->ip6, htons(p->ip6->payload_length) -
p->header_len, 58);
cksum = ones_add(p->icmp->cksum, cksum);
if (p->icmp->type == 128) {
p->icmp->type = 8;
p->icmp->cksum = ones_add(cksum, 128 - 8);
} else {
p->icmp->type = 0;
p->icmp->cksum = ones_add(cksum, 129 - 0);
}
return 0;
case 17:
if (p->data_len < 8)
return -1;
tck = (uint16_t *)(p->data + 6);
if (!*tck)
return -1; /* drop UDP packets with no checksum */
break;
case 6:
if (p->data_len < 20)
return -1;
tck = (uint16_t *)(p->data + 16);
break;
default:
return 0;
}
*tck = ones_add(*tck, convert_cksum(p->ip6, ip4));
return 0;
}
static void xlate_6to4_data(struct pkt *p)
{
struct {
struct tun_pi pi;
struct ip4 ip4;
} __attribute__ ((__packed__)) header;
struct cache_entry *src = NULL, *dest = NULL;
struct iovec iov[2];
if (map_ip6_to_ip4(&header.ip4.dest, &p->ip6->dest, &dest, 0)) {
host_send_icmp6_error(1, 0, 0, p);
return;
}
if (map_ip6_to_ip4(&header.ip4.src, &p->ip6->src, &src, 1)) {
host_send_icmp6_error(1, 5, 0, p);
return;
}
if (sizeof(struct ip6) + p->header_len + p->data_len > gcfg->mtu) {
host_send_icmp6_error(2, 0, gcfg->mtu, p);
return;
}
xlate_header_6to4(p, &header.ip4, p->data_len, dest);
--header.ip4.ttl;
if (xlate_payload_6to4(p, &header.ip4) < 0)
return;
if (src)
src->flags |= CACHE_F_SEEN_6TO4;
if (dest)
dest->flags |= CACHE_F_SEEN_6TO4;
header.pi.flags = 0;
header.pi.proto = htons(ETH_P_IP);
header.ip4.cksum = ip_checksum(&header.ip4, sizeof(header.ip4));
iov[0].iov_base = &header;
iov[0].iov_len = sizeof(header);
iov[1].iov_base = p->data;
iov[1].iov_len = p->data_len;
if (writev(gcfg->tun_fd, iov, 2) < 0)
slog(LOG_WARNING, "error writing packet to tun device: %s\n",
strerror(errno));
}
static int parse_ip6(struct pkt *p)
{
int hdr_len;
p->ip6 = (struct ip6 *)(p->data);
if (p->data_len < sizeof(struct ip6) ||
(ntohl(p->ip6->ver_tc_fl) >> 28) != 6 ||
validate_ip6_addr(&p->ip6->src) ||
validate_ip6_addr(&p->ip6->dest))
return -1;
p->data_proto = p->ip6->next_header;
p->data += sizeof(struct ip6);
p->data_len -= sizeof(struct ip6);
if (p->data_len > ntohs(p->ip6->payload_length))
p->data_len = ntohs(p->ip6->payload_length);
while (p->data_proto == 0 || p->data_proto == 43 ||
p->data_proto == 60) {
if (p->data_len < 2)
return -1;
hdr_len = (p->data[1] + 1) * 8;
if (p->data_len < hdr_len)
return -1;
p->data_proto = p->data[0];
p->data += hdr_len;
p->data_len -= hdr_len;
p->header_len += hdr_len;
}
if (p->data_proto == 44) {
if (p->ip6_frag || p->data_len < sizeof(struct ip6_frag))
return -1;
p->ip6_frag = (struct ip6_frag *)p->data;
p->data_proto = p->ip6_frag->next_header;
p->data += sizeof(struct ip6_frag);
p->data_len -= sizeof(struct ip6_frag);
p->header_len += sizeof(struct ip6_frag);
if ((p->ip6_frag->offset_flags & htons(IP6_F_MF)) &&
(p->data_len & 0x7))
return -1;
if ((uint32_t)(ntohs(p->ip6_frag->offset_flags) & IP6_F_MASK) +
p->data_len > 65535)
return -1;
}
if (p->data_proto == 58) {
if (p->ip6_frag && (p->ip6_frag->offset_flags &
htons(IP6_F_MASK | IP6_F_MF)))
return -1; /* fragmented ICMP is unsupported */
if (p->data_len < sizeof(struct icmp))
return -1;
p->icmp = (struct icmp *)(p->data);
}
return 0;
}
static void xlate_6to4_icmp_error(struct pkt *p)
{
struct {
struct tun_pi pi;
struct ip4 ip4;
struct icmp icmp;
struct ip4 ip4_em;
} __attribute__ ((__packed__)) header;
struct iovec iov[2];
struct pkt p_em;
uint32_t mtu;
uint16_t em_len;
int allow_fake_source = 0;
memset(&p_em, 0, sizeof(p_em));
p_em.data = p->data + sizeof(struct icmp);
p_em.data_len = p->data_len - sizeof(struct icmp);
if (p->icmp->type == 1 || p->icmp->type == 3) {
em_len = (ntohl(p->icmp->word) >> 21) & 0x7f8;
if (em_len) {
if (p_em.data_len < em_len)
return;
p_em.data_len = em_len;
}
}
if (parse_ip6(&p_em) < 0)
return;
if (p_em.data_proto == 58 && p_em.icmp->type != 128)
return;
if (sizeof(struct ip4) * 2 + sizeof(struct icmp) + p_em.data_len > 576)
p_em.data_len = 576 - sizeof(struct ip4) * 2 -
sizeof(struct icmp);
switch (p->icmp->type) {
case 1: /* Destination Unreachable */
header.icmp.type = 3; /* Destination Unreachable */
header.icmp.word = 0;
switch (p->icmp->code) {
case 0: /* No route to destination */
case 2: /* Beyond scope of source address */
header.icmp.code = 1; /* Host Unreachable */
allow_fake_source = 1;
break;
case 1: /* Administratively prohibited */
header.icmp.code = 10; /* Administratively prohibited */
break;
case 4: /* Port Unreachable */
header.icmp.code = 3; /* Port Unreachable */
break;
default:
return;
}
break;
case 2: /* Packet Too Big */
header.icmp.type = 3; /* Destination Unreachable */
header.icmp.code = 4; /* Fragmentation needed */
mtu = ntohl(p->icmp->word);
if (mtu < 68) {
slog(LOG_INFO, "no mtu in Packet Too Big message\n");
return;
}
if (mtu > gcfg->mtu)
mtu = gcfg->mtu;
mtu -= MTU_ADJ;
header.icmp.word = htonl(mtu);
allow_fake_source = 1;
break;
case 3: /* Time Exceeded */
header.icmp.type = 11; /* Time Exceeded */
header.icmp.code = p->icmp->code;
header.icmp.word = 0;
break;
case 4: /* Parameter Problem */
if (p->icmp->code == 1) {
header.icmp.type = 3; /* Destination Unreachable */
header.icmp.code = 2; /* Protocol Unreachable */
header.icmp.word = 0;
break;
} else if (p->icmp->code != 0) {
return;
}
header.icmp.type = 12; /* Parameter Problem */
header.icmp.code = 0;
/* XXX do this and remove return */
return;
default:
return;
}
if (map_ip6_to_ip4(&header.ip4_em.src, &p_em.ip6->src, NULL, 0) ||
map_ip6_to_ip4(&header.ip4_em.dest,
&p_em.ip6->dest, NULL, 0) ||
xlate_payload_6to4(&p_em, &header.ip4_em) < 0)
return;
xlate_header_6to4(&p_em, &header.ip4_em,
ntohs(p_em.ip6->payload_length) - p_em.header_len, NULL);
header.ip4_em.cksum =
ip_checksum(&header.ip4_em, sizeof(header.ip4_em));
if (map_ip6_to_ip4(&header.ip4.src, &p->ip6->src, NULL, 0)) {
if (allow_fake_source)
header.ip4.src = gcfg->local_addr4;
else
return;
}
if (map_ip6_to_ip4(&header.ip4.dest, &p->ip6->dest, NULL, 0))
return;
xlate_header_6to4(p, &header.ip4, sizeof(header.icmp) +
sizeof(header.ip4_em) + p_em.data_len, NULL);
--header.ip4.ttl;
header.ip4.cksum = ip_checksum(&header.ip4, sizeof(header.ip4));
header.icmp.cksum = 0;
header.icmp.cksum = ones_add(ip_checksum(&header.icmp,
sizeof(header.icmp) +
sizeof(header.ip4_em)),
ip_checksum(p_em.data, p_em.data_len));
header.pi.flags = 0;
header.pi.proto = htons(ETH_P_IP);
iov[0].iov_base = &header;
iov[0].iov_len = sizeof(header);
iov[1].iov_base = p_em.data;
iov[1].iov_len = p_em.data_len;
if (writev(gcfg->tun_fd, iov, 2) < 0)
slog(LOG_WARNING, "error writing packet to tun device: %s\n",
strerror(errno));
}
void handle_ip6(struct pkt *p)
{
if (parse_ip6(p) < 0 || p->ip6->hop_limit == 0 ||
p->header_len + p->data_len !=
ntohs(p->ip6->payload_length))
return;
if (p->icmp && ones_add(ip_checksum(p->data, p->data_len),
ip6_checksum(p->ip6, p->data_len, 58)))
return;
if (IN6_ARE_ADDR_EQUAL(&p->ip6->dest, &gcfg->local_addr6)) {
if (p->data_proto == 58)
host_handle_icmp6(p);
else
host_send_icmp6_error(4, 1, 6, p);
} else {
if (p->ip6->hop_limit == 1) {
host_send_icmp6_error(3, 0, 0, p);
return;
}
if (p->data_proto != 58 || p->icmp->type == 128 ||
p->icmp->type == 129)
xlate_6to4_data(p);
else
xlate_6to4_icmp_error(p);
}
}

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.TH TAYGA "8" "June 2011" "TAYGA 0.9.2" ""
.SH NAME
tayga \- stateless NAT64 daemon
.SH SYNOPSIS
.B tayga
.I [OPTION]...
.PP
.B "tayga \-\-mktun"
.I [OPTION]...
.PP
.B "tayga \-\-rmtun"
.I [OPTION]...
.SH DESCRIPTION
TAYGA is a stateless NAT64 daemon for Linux. Using the in-kernel TUN network
driver, TAYGA receives IPv4 and IPv6 packets from the host's network stack,
translates them to the other protocol, and then sends the translated packets
back to the host using the same TUN interface.
.P
Translation is compliant with IETF Internet-Draft
draft-ietf-behave-v6v4-xlate-23, and address mapping is performed in
accordance with RFC 6052. Optionally, TAYGA may be configured to dynamically
map IPv6 hosts to addresses drawn from a configured IPv4 address pool.
.P
As a stateless NAT, TAYGA requires a one-to-one mapping between IPv4 addresses
and IPv6 addresses. Mapping multiple IPv6 addresses onto a single IPv4
address can be achieved by mapping IPv6 addresses to private IPv4 addresses
with TAYGA and then using a stateful NAT44 (such as the iptables(8) MASQUERADE
target) to map the private IPv4 addresses onto the desired single IPv4 address.
.P
TAYGA's configuration is stored in the tayga.conf(5) file, which is usually
found in /etc/tayga.conf or /usr/local/etc/tayga.conf.
.SH INVOCATION
Without the
.B \-\-mktun
or
.B \-\-rmtun
options, the `tayga` executable runs as a daemon, translating packets as
described above.
.P
The
.B \-\-mktun
and
.B \-\-rmtun
options instruct TAYGA to create or destroy, respectively, its configured TUN
device as a "persistent" interface and then immediately exit.
.P
Persistent TUN devices remain present on the host system even when TAYGA is
not running. This allows host-side network parameters and firewall rules to
be configured prior to commencement of packet translation. This may simplify
network configuration on the host; for example, systems which use a
Debian-style /etc/network/interfaces file may configure TAYGA's TUN device at
boot by running `tayga --mktun` as a "pre-up" command and then configuring the
TUN device as any other network interface.
.SH OPTIONS
.TP
.BI "\-c " configfile " | \-\-config " configfile
Read configuration options from
.I configfile
.TP
.B \-d
Enable debug messages (enables
.B \-\-nodetach
as well)
.TP
.B "\-n | \-\-nodetach"
Do not detach from terminal
.TP
.BI "\-u " userid " | \-\-user " userid
Set uid to
.I userid
after initialization
.TP
.BI "\-g " groupid " | \-\-group " groupid
Set gid to
.I groupid
after initialization
.TP
.B "\-r | \-\-chroot"
chroot() to data\-dir (specified in config file)
.TP
.BI "\-p " pidfile " | \-\-pidfile " pidfile
Write process ID of daemon to
.I pidfile
.SH AUTHOR
Written by Nathan Lutchansky <lutchann@litech.org>
.SH COPYRIGHT
Copyright \(co 2010 Nathan Lutchansky
.br
License GPLv2+: GNU GPL version 2 or later
.br
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
.SH "SEE ALSO"
.BR tayga.conf (5)
.br
.BR <http://www.litech.org/tayga/>

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/*
* tayga.c -- main server code
*
* part of TAYGA <http://www.litech.org/tayga/>
* Copyright (C) 2010 Nathan Lutchansky <lutchann@litech.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <tayga.h>
#include <stdarg.h>
#include <signal.h>
#include <getopt.h>
#include <pwd.h>
#include <grp.h>
#define USAGE_TEXT \
"Usage: %s [-c|--config CONFIGFILE] [-d] [-n|--nodetach] [-u|--user USERID]\n" \
" [-g|--group GROUPID] [-r|--chroot] [-p|--pidfile PIDFILE]\n\n" \
"--config FILE : Read configuration options from FILE\n" \
"-d : Enable debug messages (implies --nodetach)\n" \
"--nodetach : Do not detach from terminal\n" \
"--user USERID : Set uid to USERID after initialization\n" \
"--group GROUPID : Set gid to GROUPID after initialization\n" \
"--chroot : chroot() to data-dir (specified in config file)\n\n" \
"--pidfile FILE : Write process ID of daemon to FILE\n"
extern struct config *gcfg;
time_t now;
static int signalfds[2];
static int use_stdout;
void slog(int priority, const char *format, ...)
{
va_list ap;
va_start(ap, format);
if (use_stdout)
vprintf(format, ap);
else if (priority != LOG_DEBUG)
vsyslog(priority, format, ap);
va_end(ap);
}
static void set_nonblock(int fd)
{
int flags;
flags = fcntl(fd, F_GETFL);
if (flags < 0) {
slog(LOG_CRIT, "fcntl F_GETFL returned %s\n", strerror(errno));
exit(1);
}
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0) {
slog(LOG_CRIT, "fcntl F_SETFL returned %s\n", strerror(errno));
exit(1);
}
}
void read_random_bytes(void *d, int len)
{
int ret;
ret = read(gcfg->urandom_fd, d, len);
if (ret < 0) {
slog(LOG_CRIT, "read /dev/urandom returned %s\n",
strerror(errno));
exit(1);
}
if (ret < len) {
slog(LOG_CRIT, "read /dev/urandom returned EOF\n");
exit(1);
}
}
static void tun_setup(int do_mktun, int do_rmtun)
{
struct ifreq ifr;
int fd;
gcfg->tun_fd = open("/dev/net/tun", O_RDWR);
if (gcfg->tun_fd < 0) {
slog(LOG_CRIT, "Unable to open /dev/net/tun, aborting: %s\n",
strerror(errno));
exit(1);
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN;
strcpy(ifr.ifr_name, gcfg->tundev);
if (ioctl(gcfg->tun_fd, TUNSETIFF, &ifr) < 0) {
slog(LOG_CRIT, "Unable to attach tun device %s, aborting: "
"%s\n", gcfg->tundev, strerror(errno));
exit(1);
}
if (do_mktun) {
if (ioctl(gcfg->tun_fd, TUNSETPERSIST, 1) < 0) {
slog(LOG_CRIT, "Unable to set persist flag on %s, "
"aborting: %s\n", gcfg->tundev,
strerror(errno));
exit(1);
}
if (ioctl(gcfg->tun_fd, TUNSETOWNER, 0) < 0) {
slog(LOG_CRIT, "Unable to set owner on %s, "
"aborting: %s\n", gcfg->tundev,
strerror(errno));
exit(1);
}
if (ioctl(gcfg->tun_fd, TUNSETGROUP, 0) < 0) {
slog(LOG_CRIT, "Unable to set group on %s, "
"aborting: %s\n", gcfg->tundev,
strerror(errno));
exit(1);
}
slog(LOG_NOTICE, "Created persistent tun device %s\n",
gcfg->tundev);
return;
} else if (do_rmtun) {
if (ioctl(gcfg->tun_fd, TUNSETPERSIST, 0) < 0) {
slog(LOG_CRIT, "Unable to clear persist flag on %s, "
"aborting: %s\n", gcfg->tundev,
strerror(errno));
exit(1);
}
slog(LOG_NOTICE, "Removed persistent tun device %s\n",
gcfg->tundev);
return;
}
set_nonblock(gcfg->tun_fd);
fd = socket(PF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
slog(LOG_CRIT, "Unable to create socket, aborting: %s\n",
strerror(errno));
exit(1);
}
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, gcfg->tundev);
if (ioctl(fd, SIOCGIFMTU, &ifr) < 0) {
slog(LOG_CRIT, "Unable to query MTU, aborting: %s\n",
strerror(errno));
exit(1);
}
close(fd);
gcfg->mtu = ifr.ifr_mtu;
slog(LOG_INFO, "Using tun device %s with MTU %d\n", gcfg->tundev,
gcfg->mtu);
}
static void signal_handler(int signal)
{
write(signalfds[1], &signal, sizeof(signal));
}
static void signal_setup(void)
{
struct sigaction act;
if (pipe(signalfds) < 0) {
slog(LOG_INFO, "unable to create signal pipe, aborting: %s\n",
strerror(errno));
exit(1);
}
set_nonblock(signalfds[0]);
set_nonblock(signalfds[1]);
memset(&act, 0, sizeof(act));
act.sa_handler = signal_handler;
sigaction(SIGINT, &act, NULL);
sigaction(SIGHUP, &act, NULL);
sigaction(SIGUSR1, &act, NULL);
sigaction(SIGUSR2, &act, NULL);
sigaction(SIGQUIT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
}
static void read_from_tun(void)
{
int ret;
struct tun_pi *pi = (struct tun_pi *)gcfg->recv_buf;
struct pkt pbuf, *p = &pbuf;
ret = read(gcfg->tun_fd, gcfg->recv_buf, gcfg->recv_buf_size);
if (ret < 0) {
if (errno == EAGAIN)
return;
slog(LOG_ERR, "received error when reading from tun "
"device: %s\n", strerror(errno));
return;
}
if (ret < sizeof(struct tun_pi)) {
slog(LOG_WARNING, "short read from tun device "
"(%d bytes)\n", ret);
return;
}
if (ret == gcfg->recv_buf_size) {
slog(LOG_WARNING, "dropping oversized packet\n");
return;
}
memset(p, 0, sizeof(struct pkt));
p->data = gcfg->recv_buf + sizeof(struct tun_pi);
p->data_len = ret - sizeof(struct tun_pi);
switch (ntohs(pi->proto)) {
case ETH_P_IP:
handle_ip4(p);
break;
case ETH_P_IPV6:
handle_ip6(p);
break;
default:
slog(LOG_WARNING, "Dropping unknown proto %04x from "
"tun device\n", ntohs(pi->proto));
break;
}
}
static void read_from_signalfd(void)
{
int ret, sig;
for (;;) {
ret = read(signalfds[0], &sig, sizeof(sig));
if (ret < 0) {
if (errno == EAGAIN)
return;
slog(LOG_CRIT, "got error %s from signalfd\n",
strerror(errno));
exit(1);
}
if (ret == 0) {
slog(LOG_CRIT, "signal fd was closed\n");
exit(1);
}
if (gcfg->dynamic_pool)
dynamic_maint(gcfg->dynamic_pool, 1);
slog(LOG_NOTICE, "exiting on signal %d\n", sig);
exit(0);
}
}
int main(int argc, char **argv)
{
int c, ret, longind;
int pidfd;
struct pollfd pollfds[2];
struct map6 *m6;
char addrbuf[INET6_ADDRSTRLEN];
char *conffile = TAYGA_CONF_PATH;
char *user = NULL;
char *group = NULL;
char *pidfile = NULL;
int do_chroot = 0;
int detach = 1;
int do_mktun = 0;
int do_rmtun = 0;
struct passwd *pw = NULL;
struct group *gr = NULL;
static struct option longopts[] = {
{ "mktun", 0, 0, 0 },
{ "rmtun", 0, 0, 0 },
{ "help", 0, 0, 0 },
{ "config", 1, 0, 'c' },
{ "nodetach", 0, 0, 'n' },
{ "user", 1, 0, 'u' },
{ "group", 1, 0, 'g' },
{ "chroot", 0, 0, 'r' },
{ "pidfile", 1, 0, 'p' },
{ 0, 0, 0, 0 }
};
for (;;) {
c = getopt_long(argc, argv, "c:dnu:g:rp:", longopts, &longind);
if (c == -1)
break;
switch (c) {
case 0:
if (longind == 0) {
if (do_rmtun) {
fprintf(stderr, "Error: both --mktun "
"and --rmtun specified.\n");
exit(1);
}
do_mktun = 1;
} else if (longind == 1) {
if (do_mktun) {
fprintf(stderr, "Error: both --mktun "
"and --rmtun specified.\n");
exit(1);
}
do_rmtun = 1;
} else if (longind == 2) {
fprintf(stderr, USAGE_TEXT, argv[0]);
exit(0);
}
break;
case 'c':
conffile = optarg;
break;
case 'd':
use_stdout = 1;
detach = 0;
break;
case 'n':
detach = 0;
break;
case 'u':
user = optarg;
break;
case 'g':
group = optarg;
break;
case 'r':
do_chroot = 1;
break;
case 'p':
pidfile = optarg;
break;
default:
fprintf(stderr, "Try `%s --help' for more "
"information.\n", argv[0]);
exit(1);
}
}
if (do_mktun || do_rmtun) {
use_stdout = 1;
if (user) {
fprintf(stderr, "Error: cannot specify -u or --user "
"with mktun/rmtun operation\n");
exit(1);
}
if (group) {
fprintf(stderr, "Error: cannot specify -g or --group "
"with mktun/rmtun operation\n");
exit(1);
}
if (do_chroot) {
fprintf(stderr, "Error: cannot specify -r or --chroot "
"with mktun/rmtun operation\n");
exit(1);
}
read_config(conffile);
tun_setup(do_mktun, do_rmtun);
return 0;
}
if (!use_stdout)
openlog("tayga", LOG_PID | LOG_NDELAY, LOG_DAEMON);
if (user) {
pw = getpwnam(user);
if (!pw) {
slog(LOG_CRIT, "Error: user %s does not exist\n", user);
exit(1);
}
}
if (group) {
gr = getgrnam(group);
if (!gr) {
slog(LOG_CRIT, "Error: group %s does not exist\n",
group);
exit(1);
}
}
read_config(conffile);
if (!gcfg->data_dir[0]) {
if (do_chroot) {
slog(LOG_CRIT, "Error: cannot chroot when no data-dir "
"is specified in %s\n", conffile);
exit(1);
}
chdir("/");
} else if (chdir(gcfg->data_dir) < 0) {
if (user || errno != ENOENT) {
slog(LOG_CRIT, "Error: unable to chdir to %s, "
"aborting: %s\n", gcfg->data_dir,
strerror(errno));
exit(1);
}
if (mkdir(gcfg->data_dir, 0777) < 0) {
slog(LOG_CRIT, "Error: unable to create %s, aborting: "
"%s\n", gcfg->data_dir,
strerror(errno));
exit(1);
}
if (chdir(gcfg->data_dir) < 0) {
slog(LOG_CRIT, "Error: created %s but unable to chdir "
"to it!?? (%s)\n", gcfg->data_dir,
strerror(errno));
exit(1);
}
}
if (do_chroot && (!pw || pw->pw_uid == 0)) {
slog(LOG_CRIT, "Error: chroot is ineffective without also "
"specifying the -u option to switch to an "
"unprivileged user\n");
exit(1);
}
if (pidfile) {
pidfd = open(pidfile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (pidfd < 0) {
slog(LOG_CRIT, "Error, unable to open %s for "
"writing: %s\n", pidfile,
strerror(errno));
exit(1);
}
}
if (detach && daemon(1, 0) < 0) {
slog(LOG_CRIT, "Error, unable to fork and detach: %s\n",
strerror(errno));
exit(1);
}
if (pidfile) {
snprintf(addrbuf, sizeof(addrbuf), "%ld\n", (long)getpid());
write(pidfd, addrbuf, strlen(addrbuf));
close(pidfd);
}
slog(LOG_INFO, "starting TAYGA " VERSION "\n");
if (gcfg->cache_size) {
gcfg->urandom_fd = open("/dev/urandom", O_RDONLY);
if (gcfg->urandom_fd < 0) {
slog(LOG_CRIT, "Unable to open /dev/urandom, "
"aborting: %s\n", strerror(errno));
exit(1);
}
read_random_bytes(gcfg->rand, 8 * sizeof(uint32_t));
gcfg->rand[0] |= 1; /* need an odd number for IPv4 hash */
}
tun_setup(0, 0);
if (do_chroot) {
if (chroot(gcfg->data_dir) < 0) {
slog(LOG_CRIT, "Unable to chroot to %s: %s\n",
gcfg->data_dir, strerror(errno));
exit(1);
}
chdir("/");
}
if (gr) {
if (setregid(gr->gr_gid, gr->gr_gid) < 0 ||
setregid(gr->gr_gid, gr->gr_gid) < 0 ||
setgroups(1, &gr->gr_gid) < 0) {
slog(LOG_CRIT, "Error: cannot set gid to %d: %s\n",
gr->gr_gid, strerror(errno));
exit(1);
}
}
if (pw) {
if (setreuid(pw->pw_uid, pw->pw_uid) < 0 ||
setreuid(pw->pw_uid, pw->pw_uid) < 0) {
slog(LOG_CRIT, "Error: cannot set uid to %d: %s\n",
pw->pw_uid, strerror(errno));
exit(1);
}
}
signal_setup();
inet_ntop(AF_INET, &gcfg->local_addr4, addrbuf, sizeof(addrbuf));
slog(LOG_INFO, "TAYGA's IPv4 address: %s\n", addrbuf);
inet_ntop(AF_INET6, &gcfg->local_addr6, addrbuf, sizeof(addrbuf));
slog(LOG_INFO, "TAYGA's IPv6 address: %s\n", addrbuf);
m6 = list_entry(gcfg->map6_list.prev, struct map6, list);
if (m6->type == MAP_TYPE_RFC6052) {
inet_ntop(AF_INET6, &m6->addr, addrbuf, sizeof(addrbuf));
slog(LOG_INFO, "NAT64 prefix: %s/%d\n",
addrbuf, m6->prefix_len);
if (m6->addr.s6_addr32[0] == WKPF)
slog(LOG_INFO, "Note: traffic between IPv6 hosts and "
"private IPv4 addresses (i.e. to/from "
"64:ff9b::10.0.0.0/104, "
"64:ff9b::192.168.0.0/112, etc) "
"will be dropped. Use a translation "
"prefix within your organization's "
"IPv6 address space instead of "
"64:ff9b::/96 if you need your "
"IPv6 hosts to communicate with "
"private IPv4 addresses.\n");
}
if (gcfg->dynamic_pool) {
inet_ntop(AF_INET, &gcfg->dynamic_pool->map4.addr,
addrbuf, sizeof(addrbuf));
slog(LOG_INFO, "Dynamic pool: %s/%d\n", addrbuf,
gcfg->dynamic_pool->map4.prefix_len);
if (gcfg->data_dir[0])
load_dynamic(gcfg->dynamic_pool);
else
slog(LOG_INFO, "Note: dynamically-assigned mappings "
"will not be saved across restarts. "
"Specify data-dir in %s if you would "
"like dynamic mappings to be "
"persistent.\n", conffile);
}
if (gcfg->cache_size)
create_cache();
gcfg->recv_buf = (uint8_t *)malloc(gcfg->recv_buf_size);
if (!gcfg->recv_buf) {
slog(LOG_CRIT, "Error: unable to allocate %d bytes for "
"receive buffer\n", gcfg->recv_buf_size);
exit(1);
}
memset(pollfds, 0, 2 * sizeof(struct pollfd));
pollfds[0].fd = signalfds[0];
pollfds[0].events = POLLIN;
pollfds[1].fd = gcfg->tun_fd;
pollfds[1].events = POLLIN;
for (;;) {
ret = poll(pollfds, 2, POOL_CHECK_INTERVAL * 1000);
if (ret < 0) {
if (errno == EINTR)
continue;
slog(LOG_ERR, "poll returned error %s\n",
strerror(errno));
exit(1);
}
time(&now);
if (pollfds[0].revents)
read_from_signalfd();
if (pollfds[1].revents)
read_from_tun();
if (gcfg->cache_size && (gcfg->last_cache_maint +
CACHE_CHECK_INTERVAL < now ||
gcfg->last_cache_maint > now)) {
addrmap_maint();
gcfg->last_cache_maint = now;
}
if (gcfg->dynamic_pool && (gcfg->last_dynamic_maint +
POOL_CHECK_INTERVAL < now ||
gcfg->last_dynamic_maint > now)) {
dynamic_maint(gcfg->dynamic_pool, 0);
gcfg->last_dynamic_maint = now;
}
}
return 0;
}

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.TH TAYGA.CONF "5" "June 2011" "TAYGA 0.9.2" ""
.SH NAME
tayga.conf \- configuration file of the TAYGA stateless NAT64 daemon
.SH DESCRIPTION
This file contains the configuration parameters for the TAYGA stateless NAT64
daemon. It must exist and contain the mandatory configuration items or
TAYGA will refuse to run.
.P
The configuration directives are listed below. With the exception of the
.B map
directive, only one instance of each directive may appear in tayga.conf.
.TP
.BI "tun-device " device
Name of the network interface that will be created by the kernel TUN module
for TAYGA to exchange IPv4 and IPv6 packets with the in-kernel TCP/IP stack.
If
.I device
does not already exist as a persistent interface (created by the
.B \-\-mktun
flag to tayga(8), for example), it will be created automatically when the
TAYGA daemon starts and destroyed when the daemon exits.
.IP
Note that TAYGA does not configure the host-side parameters of
.I device.
This must be done by the system administrator using the ifconfig(8), route(8),
and/or ip(8) commands.
.IP
This configuration directive is mandatory.
.TP
.BI "ipv4-addr " ipv4_address
IPv4 address that TAYGA will use as the source address for ICMPv4 errors
generated by the translation process. TAYGA will also respond to ICMP echo
requests (pings) at this address.
.IP
.I ipv4_address
is permitted to overlap with the prefix specified in the
.B dynamic-pool
directive, in which case
.I ipv4_address
will be removed from the pool of available addresses.
.IP
This configuration directive is mandatory.
.TP
.BI "ipv6-addr " ipv6_address
IPv6 address that TAYGA will use as the source address for ICMPv6 errors
generated by the translation process. TAYGA will also respond to ICMPv6 echo
requests (pings) at this address.
.IP
This configuration directive is mandatory unless the NAT64 prefix is specified
with the
.B prefix
directive, in which case TAYGA will generate its IPv6 address by mapping the
address specified in
.B ipv4-addr
into the NAT64 prefix.
.TP
.BI "prefix " ipv6_address/length
NAT64 prefix for mapping IPv4 addresses into the IPv6 address space. TAYGA
performs address translation as specified in RFC 6052, and only prefix lengths
allowed in that document will be permitted in the
.B prefix
directive.
.IP
The use of either a Network-Specific Prefix or the Well-Known Prefix
(64:ff9b::/96) is allowed,
.B however,
as required by RFC 6052, TAYGA will refuse to translate packets with a
source or destination address composed of the Well-Known Prefix and a
non-global IPv4 address (10.x.x.x, 192.168.x.x, etc).
.IP
Use of the
.B prefix
directive is optional. If it is not specified, all addresses to be translated
must be listed individually with the
.B map
directive.
.TP
.BI "map " "ipv4_address ipv6_address"
Creates a static mapping between
.I ipv4_address
and
.I ipv6_address
to be used when translating IPv4 packets to IPv6 or IPv6 packets to IPv4.
Multiple
.B map
directives are permitted in the tayga.conf file.
.IP
.I ipv4_address
is permitted to overlap with the prefix specified in the
.B dynamic-pool
directive, in which case
.I ipv4_address
will be removed from the pool of available addresses.
.IP
.I ipv6_address
.B "must not"
overlap with the prefix specified in the
.B prefix
directive.
.TP
.BI "dynamic-pool " ipv4_address/length
Address prefix containing addresses available to be assigned to IPv6 hosts.
.I
length
must be 31 or less, as the lowest-numbered address in the prefix is considered
reserved and will not be used for dynamic assignment.
.IP
If TAYGA receives an IPv6 packet to be translated with an IPv6 source address
that does not match any existing mapping rules (as specified by the
.B map
directive or the
.B prefix
directive), TAYGA will create a dynamic mapping between the IPv6 address and
an IPv4 address drawn from the prefix specified by the
.B dynamic-pool
directive. This mapping will be valid for two hours and four minutes after
the last packet matching the mapping is translated.
.IP
The
.B dynamic-pool
directive is optional. If it is not specified, all IPv6 addresses appearing
in packets passing through TAYGA must match the NAT64 prefix or a static
mapping rule.
.TP
.BI "data-dir " path
The absolute path of a directory where TAYGA should store its data files.
Presently the only data file that TAYGA will store is the
.I dynamic.map
file, which tracks dynamic address assignments made from the dynamic pool.
.IP
.I path
is also the directory that will be used as a chroot(2) "jail" if the
.B \-\-chroot
command-line option is specified to the TAYGA daemon.
.IP
The TAYGA daemon must have full permissions (rwx) to
.I path
after it has dropped superuser privileges. Generally this means that the
owner of
.I path
should be the user specified in the
.B \-\-user
command-line option.
.IP
The
.B data-dir
directive is optional, but without it, dynamic mappings will be lost when the
TAYGA daemon is stopped. Also, use of the
.B \-\-chroot
command-line option will not be possible.
.TP
.BI "strict-frag-hdr " on|off|true|false|1|0
Flag to control whether TAYGA adds fragmentation headers to IPv6 packets that
do not require fragmentation. RFC 6145 stipulates that the fragmentation
header SHOULD be added to all translated packets when the sender has not set
the DF (Don't Fragment) flag, to indicate that the sender allows fragmentation
and may not support path MTU discovery. Unfortunately, some firewall
implementations drop IPv6 packets that are fragmented into a single fragment,
most notably Linux netfilter conntrack in kernels older than 2.6.34.
.IP
When
.B strict-frag-hdr
is set to
.B true, on,
or
.B 1,
fragmentation headers will be added to all translated packets where the
DF bit in the original packet is clear. This is the RFC-complaint behavior.
.IP
When
.B strict-frag-hdr
is set to
.B false, off,
or
.B 0,
fragmentation headers will be suppressed when the translated packet fits
entirely within the IPv6 network MTU (1280 bytes). This is the default
behavior.
.IP
This setting does not affect packets that arrive at TAYGA already fragmented,
or packets that must be fragmented to fit within the IPv6 network MTU.
.SH "SEE ALSO"
.BR tayga (8)
.br
.BR <http://www.litech.org/tayga/>

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#
# Sample configuration file for TAYGA 0.9.2
#
# Modify this to use your own addresses!!
#
#
# TUN device that TAYGA will use to exchange IPv4 and IPv6 packets with the
# kernel. You may use any name you like, but `nat64' is recommended.
#
# This device may be created before starting the tayga daemon by running
# `tayga --mktun`. This allows routing and firewall rules to be set up prior
# to commencement of packet translation.
#
# Mandatory.
#
tun-device nat64
#
# TAYGA's IPv4 address. This is NOT your router's IPv4 address! TAYGA
# requires its own address because it acts as an IPv4 and IPv6 router, and
# needs to be able to send ICMP messages. TAYGA will also respond to ICMP
# echo requests (ping) at this address.
#
# This address can safely be located inside the dynamic-pool prefix.
#
# Mandatory.
#
ipv4-addr 192.168.255.1
#
# TAYGA's IPv6 address. This is NOT your router's IPv6 address! TAYGA
# requires its own address because it acts as an IPv4 and IPv6 router, and
# needs to be able to send ICMP messages. TAYGA will also respond to ICMP
# echo requests (ping6) at this address.
#
# You can leave ipv6-addr unspecified and TAYGA will construct its IPv6
# address using ipv4-addr and the NAT64 prefix.
#
# Optional if the NAT64 prefix is specified, otherwise mandatory. It is also
# mandatory if the NAT64 prefix is 64:ff9b::/96 and ipv4-addr is a private
# (RFC1918) address.
#
#ipv6-addr 2001:db8:1::2
#
# The NAT64 prefix. The IPv4 address space is mapped into the IPv6 address
# space by prepending this prefix to the IPv4 address. Using a /96 prefix is
# recommended in most situations, but all lengths specified in RFC 6052 are
# supported.
#
# This must be a prefix selected from your organization's IPv6 address space
# or the Well-Known Prefix 64:ff9b::/96. Note that using the Well-Known
# Prefix will prohibit IPv6 hosts from contacting IPv4 hosts that have private
# (RFC1918) addresses, per RFC 6052.
#
# The NAT64 prefix need not be specified if all required address mappings are
# listed in `map' directives. (See below.)
#
# Optional.
#
prefix 2001:db8:1:ffff::/96
# prefix 64:ff9b::/96
#
# Dynamic pool prefix. IPv6 hosts which send traffic through TAYGA (and do
# not correspond to a static map or an IPv4-translatable address in the NAT64
# prefix) will be assigned an IPv4 address from the dynamic pool. Dynamic
# maps are valid for 124 minutes after the last matching packet is seen.
#
# If no unassigned addresses remain in the dynamic pool (or no dynamic pool is
# configured), packets from unknown IPv6 hosts will be rejected with an ICMP
# unreachable error.
#
# Optional.
#
dynamic-pool 192.168.255.0/24
#
# Persistent data storage directory. The dynamic.map file, which saves the
# dynamic maps that are created from dynamic-pool, is stored in this
# directory. Omit if you do not need these maps to be persistent between
# instances of TAYGA.
#
# Optional.
#
data-dir /var/db/tayga
#
# Establishes a single-host map. If an IPv6 host should be consistently
# reachable at a specific IPv4 address, the mapping can be specified in a
# `map' directive. (IPv6 hosts numbered with an IPv4-translatable address do
# not need map directives.)
#
# IPv4 addresses specified in the `map' directive can safely be located inside
# the dynamic-pool prefix.
#
# Optional.
#
#map 192.168.5.42 2001:db8:1:4444::1
#map 192.168.5.43 2001:db8:1:4444::2
#map 192.168.255.2 2001:db8:1:569::143

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/*
* tayga.h -- main header file
*
* part of TAYGA <http://www.litech.org/tayga/>
* Copyright (C) 2010 Nathan Lutchansky <lutchann@litech.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <poll.h>
#include <fcntl.h>
#include <syslog.h>
#include <errno.h>
#include <time.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#include <linux/if_ether.h>
#include "list.h"
#include "config.h"
/* Configuration knobs */
/* Number of seconds of silence before a map ages out of the cache */
#define CACHE_MAX_AGE 120
/* Number of seconds between cache ageing passes */
#define CACHE_CHECK_INTERVAL 5
/* Number of seconds between dynamic pool ageing passes */
#define POOL_CHECK_INTERVAL 45
/* Valid token delimiters in config file and dynamic map file */
#define DELIM " \t\r\n"
/* Protocol structures */
struct ip4 {
uint8_t ver_ihl; /* 7-4: ver==4, 3-0: IHL */
uint8_t tos;
uint16_t length;
uint16_t ident;
uint16_t flags_offset; /* 15-13: flags, 12-0: frag offset */
uint8_t ttl;
uint8_t proto;
uint16_t cksum;
struct in_addr src;
struct in_addr dest;
} __attribute__ ((__packed__));
#define IP4_F_DF 0x4000
#define IP4_F_MF 0x2000
#define IP4_F_MASK 0x1fff
struct ip6 {
uint32_t ver_tc_fl; /* 31-28: ver==6, 27-20: traf cl, 19-0: flow lbl */
uint16_t payload_length;
uint8_t next_header;
uint8_t hop_limit;
struct in6_addr src;
struct in6_addr dest;
} __attribute__ ((__packed__));
struct ip6_frag {
uint8_t next_header;
uint8_t reserved;
uint16_t offset_flags; /* 15-3: frag offset, 2-0: flags */
uint32_t ident;
} __attribute__ ((__packed__));
#define IP6_F_MF 0x0001
#define IP6_F_MASK 0xfff8
struct icmp {
uint8_t type;
uint8_t code;
uint16_t cksum;
uint32_t word;
} __attribute__ ((__packed__));
#define WKPF (htonl(0x0064ff9b))
/* Adjusting the MTU by 20 does not leave room for the IP6 fragmentation
header, for fragments with the DF bit set. Follow up with BEHAVE on this.
(See http://www.ietf.org/mail-archive/web/behave/current/msg08499.html)
*/
#define MTU_ADJ 20
/* TAYGA data definitions */
struct pkt {
struct ip4 *ip4;
struct ip6 *ip6;
struct ip6_frag *ip6_frag;
struct icmp *icmp;
uint8_t data_proto;
uint8_t *data;
uint32_t data_len;
uint32_t header_len; /* inc IP hdr for v4 but excl IP hdr for v6 */
};
enum {
MAP_TYPE_STATIC,
MAP_TYPE_RFC6052,
MAP_TYPE_DYNAMIC_POOL,
MAP_TYPE_DYNAMIC_HOST,
};
struct map4 {
struct in_addr addr;
struct in_addr mask;
int prefix_len;
int type;
struct list_head list;
};
struct map6 {
struct in6_addr addr;
struct in6_addr mask;
int prefix_len;
int type;
struct list_head list;
};
struct map_static {
struct map4 map4;
struct map6 map6;
int conffile_lineno;
};
struct free_addr {
uint32_t addr; /* in-use address (host order) */
uint32_t count; /* num of free addresses after addr */
struct list_head list;
};
struct map_dynamic {
struct map4 map4;
struct map6 map6;
struct cache_entry *cache_entry;
time_t last_use;
struct list_head list;
struct free_addr free;
};
struct dynamic_pool {
struct map4 map4;
struct list_head mapped_list;
struct list_head dormant_list;
struct list_head free_list;
struct free_addr free_head;
};
struct cache_entry {
struct in6_addr addr6;
struct in_addr addr4;
time_t last_use;
uint32_t flags;
uint16_t ip4_ident;
struct list_head list;
struct list_head hash4;
struct list_head hash6;
};
#define CACHE_F_SEEN_4TO6 (1<<0)
#define CACHE_F_SEEN_6TO4 (1<<1)
#define CACHE_F_GEN_IDENT (1<<2)
#define CACHE_F_REP_AGEOUT (1<<3)
struct config {
char tundev[IFNAMSIZ];
char data_dir[512];
uint32_t recv_buf_size;
struct in_addr local_addr4;
struct in6_addr local_addr6;
struct list_head map4_list;
struct list_head map6_list;
int dyn_min_lease;
int dyn_max_lease;
int max_commit_delay;
struct dynamic_pool *dynamic_pool;
int hash_bits;
int cache_size;
int allow_ident_gen;
int ipv6_offlink_mtu;
int lazy_frag_hdr;
int urandom_fd;
int tun_fd;
uint16_t mtu;
uint8_t *recv_buf;
uint32_t rand[8];
struct list_head cache_pool;
struct list_head cache_active;
time_t last_cache_maint;
struct list_head *hash_table4;
struct list_head *hash_table6;
time_t last_dynamic_maint;
time_t last_map_write;
int map_write_pending;
};
/* Macros and static functions */
/* Get a pointer to the object containing x, which is of type "type" and
* embeds x as a field called "field" */
#define container_of(x, type, field) ({ \
const typeof( ((type *)0)->field ) *__mptr = (x); \
(type *)( (char *)__mptr - offsetof(type, field) );})
#define IN6_IS_IN_NET(addr,net,mask) \
((net)->s6_addr32[0] == ((addr)->s6_addr32[0] & \
(mask)->s6_addr32[0]) && \
(net)->s6_addr32[1] == ((addr)->s6_addr32[1] & \
(mask)->s6_addr32[1]) && \
(net)->s6_addr32[2] == ((addr)->s6_addr32[2] & \
(mask)->s6_addr32[2]) && \
(net)->s6_addr32[3] == ((addr)->s6_addr32[3] & \
(mask)->s6_addr32[3]))
/* TAYGA function prototypes */
/* addrmap.c */
int validate_ip4_addr(const struct in_addr *a);
int validate_ip6_addr(const struct in6_addr *a);
int is_private_ip4_addr(const struct in_addr *a);
int calc_ip4_mask(struct in_addr *mask, const struct in_addr *addr, int len);
int calc_ip6_mask(struct in6_addr *mask, const struct in6_addr *addr, int len);
void create_cache(void);
int insert_map4(struct map4 *m, struct map4 **conflict);
int insert_map6(struct map6 *m, struct map6 **conflict);
struct map4 *find_map4(const struct in_addr *addr4);
struct map6 *find_map6(const struct in6_addr *addr6);
int append_to_prefix(struct in6_addr *addr6, const struct in_addr *addr4,
const struct in6_addr *prefix, int prefix_len);
int map_ip4_to_ip6(struct in6_addr *addr6, const struct in_addr *addr4,
struct cache_entry **c_ptr);
int map_ip6_to_ip4(struct in_addr *addr4, const struct in6_addr *addr6,
struct cache_entry **c_ptr, int dyn_alloc);
void addrmap_maint(void);
/* conffile.c */
void read_config(char *conffile);
/* dynamic.c */
struct map6 *assign_dynamic(const struct in6_addr *addr6);
void load_dynamic(struct dynamic_pool *pool);
void dynamic_maint(struct dynamic_pool *pool, int shutdown);
/* nat64.c */
void handle_ip4(struct pkt *p);
void handle_ip6(struct pkt *p);
/* tayga.c */
void slog(int priority, const char *format, ...);
void read_random_bytes(void *d, int len);