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-rw-r--r--LICENSE339
-rw-r--r--Makefile24
-rw-r--r--README3
-rw-r--r--dkms.conf7
-rw-r--r--ip6t_MAP66.c307
-rw-r--r--ip6t_MAP66.h22
-rw-r--r--libip6t_MAP66.c170
7 files changed, 872 insertions, 0 deletions
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..d159169
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,339 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 Lesser 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
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+that any problems introduced by others will not reflect on the original
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+
+ Finally, any free program is threatened constantly by software
+patents. We wish to avoid the danger that redistributors of a free
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+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,
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+Activities other than copying, distribution and modification are not
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+ 1. You may copy and distribute verbatim copies of the Program's
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+You may charge a fee for the physical act of transferring a copy, and
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+ b) You must cause any work that you distribute or publish, that in
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+ c) If the modified program normally reads commands interactively
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+These requirements apply to the modified work as a whole. If
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+In addition, mere aggregation of another work not based on the Program
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+
+This section is intended to make thoroughly clear what is believed to
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+
+ 8. If the distribution and/or use of the Program is restricted in
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+original copyright holder who places the Program under this License
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+
+ 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
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+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
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+Foundation.
+
+ 10. If you wish to incorporate parts of the Program into other free
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+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
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+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
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+
+ 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,
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+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.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 Lesser General
+Public License instead of this License.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..a3f5a2c
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,24 @@
+obj-m := ip6t_MAP66.o
+KVERSION := $(shell uname -r)
+KPATH := /lib/modules/$(KVERSION)/build
+IPTABLES_VERSION := $(shell ip6tables --version|sed 's/^.*\([[:digit:]]\+\.[[:digit:]]\+\.[[:digit:]]\+\).*/\1/')
+IPTABLES_VERSION_CODE := $(shell echo $$(( $$(echo $(IPTABLES_VERSION)|sed 's/^.*\([[:digit:]]\+\)\.\([[:digit:]]\+\)\.\([[:digit:]]\+\).*/\1 * 65536 + \2 * 256 + \3/') )))
+
+all: libip6t_MAP66.so
+ $(MAKE) -C $(KPATH) M=$(PWD) modules
+
+libip6t_MAP66.so: libip6t_MAP66.o
+ gcc -shared -o $@ $<
+
+libip6t_MAP66.o: libip6t_MAP66.c ip6t_MAP66.h Makefile
+ gcc $(CFLAGS) -DIPTABLES_VERSION=\"$(IPTABLES_VERSION)\" -DIPTABLES_VERSION_CODE=$(IPTABLES_VERSION_CODE) -D_LARGEFILE_SOURCE=1 -D_LARGE_FILES -D_FILE_OFFSET_BITS=64 -D_REENTRANT -Werror -Wall -Waggregate-return -Wmissing-declarations -Wmissing-prototypes -Wredundant-decls -Wshadow -Winline -pipe -DXTABLES_LIBDIR=\"/usr/local/libexec/xtables\" -D_INIT=libip6t_MAP66_init -DPIC -fPIC -g -O2 -o $@ -c $<
+
+clean:
+ $(MAKE) -C /lib/modules/$(KVERSION)/build M=$(PWD) clean
+ rm -f *.so
+ rm -f *~
+
+install: /lib/xtables/libip6t_MAP66.so
+
+/lib/xtables/libip6t_MAP66.so: libip6t_MAP66.so
+ cp $< $@
diff --git a/README b/README
new file mode 100644
index 0000000..bd54b12
--- /dev/null
+++ b/README
@@ -0,0 +1,3 @@
+You need "iptables-dev", "dkms" and "linux-headers". For a DKMS
+template, see https://wiki.kubuntu.org/Kernel/Dev/DKMSPackaging
+
diff --git a/dkms.conf b/dkms.conf
new file mode 100644
index 0000000..d5ecc43
--- /dev/null
+++ b/dkms.conf
@@ -0,0 +1,7 @@
+PACKAGE_NAME="ip6t_MAP66"
+PACKAGE_VERSION="0.2"
+CLEAN="make clean"
+MAKE[0]="make all KVERSION=$kernelver"
+BUILT_MODULE_NAME[0]="ip6t_MAP66"
+DEST_MODULE_LOCATION[0]="/updates"
+AUTOINSTALL="yes"
diff --git a/ip6t_MAP66.c b/ip6t_MAP66.c
new file mode 100644
index 0000000..fb0a243
--- /dev/null
+++ b/ip6t_MAP66.c
@@ -0,0 +1,307 @@
+/*
+ * MAP66: Network Address Translation IPv6-to-IPv6 as
+ * proposed in the IETF's second NAT66 draft document.
+ * (c) 2010 sven-ola()gmx.de
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <net/ipv6.h>
+
+#include "ip6t_MAP66.h"
+
+MODULE_AUTHOR("Sven-Ola <sven-ola()gmx.de>");
+MODULE_DESCRIPTION("Xtables: MAP66 - IPv6 to IPv6 SNAT");
+MODULE_LICENSE("GPL");
+
+#undef MAP66_DEBUG
+#ifdef MAP66_DEBUG
+/* Use lock to serialize, so printks don't overlap */
+static DEFINE_SPINLOCK(MAP66_lock);
+#endif
+
+/* One's complement add */
+static inline u_int16_t add16(
+ u_int16_t a,
+ u_int16_t b)
+{
+ a += b;
+ return a + (a < b);
+}
+
+/* Calc one's complement csum */
+static inline u_int16_t csum16(const u_int16_t *buf, int len)
+{
+ u_int16_t csum = 0;
+ while(len--) csum = add16(csum, *buf++);
+ return csum;
+}
+
+/* Perform checksum neutral mapping */
+static void map16(
+ struct in6_addr* addr,
+ unsigned char mask,
+ const struct in6_addr* to,
+ u_int16_t csum)
+{
+ csum = add16(
+ *((u_int16_t*)addr + mask),
+ add16(csum16((const u_int16_t *)addr, mask), csum)
+ );
+ if (csum == 0xffff) csum = 0x0000;
+ *((u_int16_t *)addr + mask) = csum;
+ memcpy(addr, to, sizeof(u_int16_t) * mask);
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+# define rcu_dereference(p) p
+# define ipv6_addr_equal(a, b) 0 == ipv6_addr_cmp(a, b)
+# define ipv6_hdr(sbk) skb->nh.ipv6h
+# ifndef bool
+# define bool int
+# define false 0
+# define true 0
+# endif
+# define xt_target ip6t_target
+# define __read_mostly
+# define xt_register_target ip6t_register_target
+# define xt_unregister_target ip6t_unregister_target
+#endif
+
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,24)
+# define NF_INET_PRE_ROUTING NF_IP6_PRE_ROUTING
+# define NF_INET_POST_ROUTING NF_IP6_POST_ROUTING
+#endif
+
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,26)
+
+struct xt_target_param {
+ const struct net_device *in, *out;
+ const void *targinfo;
+ unsigned int hooknum;
+};
+
+struct xt_tgchk_param {
+ void *targinfo;
+};
+
+#endif
+
+static bool is_my_ipv6_addr(
+ const struct net_device *dev,
+ const struct in6_addr *addr)
+{
+#ifdef MAP66_DEBUG
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,28)
+ printk("MAP66: is_my_ipv6_addr(%s, " NIP6_FMT ")\n", NULL != dev ? dev->name : "", NIP6(*addr));
+#else
+ printk("MAP66: is_my_ipv6_addr(%s, %pI6)\n", NULL != dev ? dev->name : "", addr);
+#endif
+#endif
+ if (NULL != dev) {
+ const struct inet6_ifaddr *ifa;
+ const struct inet6_dev *idev = rcu_dereference(dev->ip6_ptr);
+ for (ifa = idev->addr_list; NULL != ifa; ifa = ifa->if_next) {
+#ifdef MAP66_DEBUG
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,28)
+ printk("MAP66: cmp " NIP6_FMT "\n", NIP6(ifa->addr));
+#else
+ printk("MAP66: cmp %pI6\n", &ifa->addr);
+#endif
+#endif
+ if (ipv6_addr_equal(&ifa->addr, addr)) return true;
+ }
+ }
+ return false;
+}
+
+static unsigned int MAP66_tg6(
+ struct sk_buff *skb,
+ const struct xt_target_param *par)
+{
+ struct ipv6hdr *hdr = ipv6_hdr(skb);
+ const struct ip6t_MAP66_info *info = (const struct ip6t_MAP66_info *)par->targinfo;
+
+#ifdef MAP66_DEBUG
+ spin_lock_bh(&MAP66_lock);
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,28)
+ printk("MAP66i: in=%s, out=%s, saddr=" NIP6_FMT ", daddr=" NIP6_FMT "\n",
+ NULL != par->in ? par->in->name : "",
+ NULL != par->out ? par->out->name : "",
+ NIP6(hdr->saddr), NIP6(hdr->daddr));
+#else
+ printk("MAP66i: in=%s, out=%s, saddr=%pI6, daddr=%pI6\n",
+ NULL != par->in ? par->in->name : "",
+ NULL != par->out ? par->out->name : "",
+ &hdr->saddr, &hdr->daddr);
+#endif
+#endif
+
+ switch(par->hooknum) {
+ case NF_INET_PRE_ROUTING:
+#ifdef MAP66_DEBUG
+ printk("MAP66 PRE, spoof=%d\n", 0 != (IP6T_MAP66_OPT_NOSPOOF & info->mapflags));
+#endif
+ if (0 != (IP6T_MAP66_OPT_NOSPOOF & info->mapflags) ||
+ !is_my_ipv6_addr(par->in, &hdr->daddr))
+ {
+ map16(&hdr->daddr, info->prefixlength, &info->prefix, info->prefixcsum);
+ }
+ break;
+ case NF_INET_POST_ROUTING:
+#ifdef MAP66_DEBUG
+ printk("MAP66 POST, spoof=%d\n", 0 != (IP6T_MAP66_OPT_NOSPOOF & info->mapflags));
+#endif
+ map16(&hdr->saddr, info->prefixlength, &info->prefix, info->prefixcsum);
+ if (0 == (IP6T_MAP66_OPT_NOSPOOF & info->mapflags) &&
+ is_my_ipv6_addr(par->out, &hdr->saddr))
+ {
+#ifdef MAP66_DEBUG
+ spin_unlock_bh(&MAP66_lock);
+#endif
+ return NF_DROP;
+ }
+ break;
+ default:
+#ifdef MAP66_DEBUG
+ printk("MAP66: unsupported hook: %d\n", par->hooknum);
+#endif
+ break;
+ }
+
+#ifdef MAP66_DEBUG
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,28)
+ printk("MAP66i: in=%s, out=%s, saddr=" NIP6_FMT ", daddr=" NIP6_FMT "\n",
+ NULL != par->in ? par->in->name : "",
+ NULL != par->out ? par->out->name : "",
+ NIP6(hdr->saddr), NIP6(hdr->daddr));
+#else
+ printk("MAP66i: in=%s, out=%s, saddr=%pI6, daddr=%pI6\n",
+ NULL != par->in ? par->in->name : "",
+ NULL != par->out ? par->out->name : "",
+ &hdr->saddr, &hdr->daddr);
+#endif
+ spin_unlock_bh(&MAP66_lock);
+#endif
+
+ return IP6T_CONTINUE;
+}
+
+static bool MAP66_tg6_check(
+ const struct xt_tgchk_param *par)
+{
+ const struct ip6t_MAP66_info *info = (const struct ip6t_MAP66_info *)par->targinfo;
+
+ if (0 >= info->prefixlength || 8 <= info->prefixlength) {
+ printk("MAP66: Unsupported prefix length /%d\n", 16 * info->prefixlength);
+ return false;
+ }
+ return true;
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+
+static unsigned int MAP66_tg6_24(
+ struct sk_buff **pskb,
+ unsigned int hooknum,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *targinfo,
+ void *userinfo)
+{
+ const struct xt_target_param par = {
+ .in = in,
+ .out = out,
+ .hooknum = hooknum,
+ .targinfo = targinfo,
+ };
+ return MAP66_tg6(*pskb, &par);
+}
+
+static int MAP66_tg6_check_24(
+ const char *table,
+ const struct ip6t_entry *entry,
+ void *targinfo,
+ unsigned int targinfosize,
+ unsigned int hook_mask)
+{
+ const struct xt_tgchk_param par = {
+ .targinfo = targinfo,
+ };
+ if (0 != (hook_mask & ~((1 << NF_IP6_PRE_ROUTING) | (1 << NF_IP6_POST_ROUTING)))) {
+ printk("MAP66: Only valid for PRE_ROUTING or POST_ROUTING.\n");
+ return 0;
+ }
+ return MAP66_tg6_check(&par);
+}
+
+#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
+
+static unsigned int MAP66_tg6_26(
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ unsigned int hooknum,
+ const struct xt_target *target,
+ const void *targinfo)
+{
+ const struct xt_target_param par = {
+ .in = in,
+ .out = out,
+ .hooknum = hooknum,
+ .targinfo = targinfo,
+ };
+ return MAP66_tg6(skb, &par);
+}
+
+static bool MAP66_tg6_check_26(
+ const char *table,
+ const void *entryinfo,
+ const struct xt_target *target,
+ void *targinfo,
+ unsigned int hook_mask)
+{
+ const struct xt_tgchk_param par = {
+ .targinfo = targinfo,
+ };
+ return MAP66_tg6_check(&par);
+}
+
+#endif
+
+static struct xt_target MAP66_tg6_reg __read_mostly = {
+ .name = "MAP66",
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
+ .target = MAP66_tg6_24,
+ .checkentry = MAP66_tg6_check_24,
+#else
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
+ .family = AF_INET6,
+ .target = MAP66_tg6_26,
+ .checkentry = MAP66_tg6_check_26,
+ .destroy = NULL,
+#else
+ .family = NFPROTO_IPV6,
+ .target = MAP66_tg6,
+ .checkentry = MAP66_tg6_check,
+#endif
+ .targetsize = sizeof(struct ip6t_MAP66_info),
+ .table = "mangle",
+ .hooks = (1 << NF_INET_POST_ROUTING) | (1 << NF_INET_PRE_ROUTING),
+#endif
+ .me = THIS_MODULE,
+};
+
+static int __init MAP66_tg6_init(void)
+{
+ return xt_register_target(&MAP66_tg6_reg);
+}
+
+static void __exit MAP66_tg6_exit(void)
+{
+ xt_unregister_target(&MAP66_tg6_reg);
+}
+
+module_init(MAP66_tg6_init);
+module_exit(MAP66_tg6_exit);
diff --git a/ip6t_MAP66.h b/ip6t_MAP66.h
new file mode 100644
index 0000000..652c1c2
--- /dev/null
+++ b/ip6t_MAP66.h
@@ -0,0 +1,22 @@
+/*
+ * MAP66: Network Address Translation IPv6-to-IPv6 as
+ * proposed in the IETF's second NAT66 draft document.
+ * (c) 2010 sven-ola()gmx.de
+ */
+
+#ifndef _IP6T_MAP66_H
+#define _IP6T_MAP66_H
+
+#define IP6T_MAP66_OPT_TO 0x01
+#define IP6T_MAP66_OPT_NOSPOOF 0x02
+
+struct ip6t_MAP66_info {
+ struct in6_addr prefix; /* The prefix to map to */
+ u_int16_t prefixcsum; /* Pre-calculated csum */
+ u_int8_t prefixlength; /* Prefix length DIV sizeof(u_int16_t) */
+ u_int8_t mapflags; /* Some flags */
+};
+
+extern void _init(void);
+
+#endif /*_IPT_MAP66_H*/
diff --git a/libip6t_MAP66.c b/libip6t_MAP66.c
new file mode 100644
index 0000000..a8a0f72
--- /dev/null
+++ b/libip6t_MAP66.c
@@ -0,0 +1,170 @@
+/*
+ * MAP66: Network Address Translation IPv6-to-IPv6 as
+ * proposed in the IETF's second NAT66 draft document.
+ * (c) 2010 sven-ola()gmx.de
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <arpa/inet.h>
+
+#define IPTABLES_VERSION_CMP(a,b,c) (((a) << 16) + ((b) << 8) + (c))
+
+#if IPTABLES_VERSION_CODE < IPTABLES_VERSION_CMP(1,4,0)
+# include <ip6tables.h>
+# define xt_entry_target ip6t_entry_target
+# define void_entry struct ip6t_entry
+# define void_ip6 struct ip6t_ip6
+# define XT_ALIGN IP6T_ALIGN
+#else
+# include <xtables.h>
+# define void_entry void
+# define void_ip6 void
+#endif
+
+#if IPTABLES_VERSION_CODE < IPTABLES_VERSION_CMP(1,4,1)
+# define xtables_target ip6tables_target
+# define XTABLES_VERSION IPTABLES_VERSION
+# define xtables_register_target register_target6
+#endif
+
+#if IPTABLES_VERSION_CODE < IPTABLES_VERSION_CMP(1,4,3)
+# define xtables_error exit_error
+# define xtables_check_inverse check_inverse
+# define NFPROTO_IPV6 PF_INET6
+#endif
+
+#include "ip6t_MAP66.h"
+
+/* One's complement add */
+static inline u_int16_t add16(
+ u_int16_t a,
+ u_int16_t b)
+{
+ a += b;
+ return a + (a < b);
+}
+
+/* Calc one's complement csum */
+static inline u_int16_t csum16(const u_int16_t *buf, int len)
+{
+ u_int16_t csum = 0;
+ while(len--) csum = add16(csum, *buf++);
+ return csum;
+}
+
+static void MAP66_help(void)
+{
+ printf(
+"MAP66 target options\n"
+" --to ipv6addr/prefixlength (External IPv6 address)\n"
+" --nospoof (Disables spoof check)\n"
+"\n"
+"Note: you need two ip6tables rules to map an internal network\n"
+"using ULAs to an external network with official IPv6 address.\n"
+"\n"
+"Example:\n"
+"\n"
+"ip6tables -t mangle -I PREROUTING -i eth0 -d 2001:0DB8:0001::/48 -j MAP66 --to FD01:0203:0405::/48\n"
+"ip6tables -t mangle -I POSTROUTING -o eth0 -s FD01:0203:0405::/48 -j MAP66 --to 2001:0DB8:0001::/48\n");
+}
+
+static int MAP66_parse(
+ int c,
+ char **argv,
+ int invert,
+ unsigned int *flags,
+ const void_entry *entry,
+ struct xt_entry_target **target)
+{
+ int i;
+ char *p;
+ struct ip6t_MAP66_info* info = (struct ip6t_MAP66_info*)(*target)->data;
+
+ switch(c) {
+ case '1':
+ if (!optarg) {
+ xtables_error(PARAMETER_PROBLEM, "--to: You must specify a value");
+ }
+ if (xtables_check_inverse(optarg, &invert, NULL, 0
+#if IPTABLES_VERSION_CODE >= IPTABLES_VERSION_CMP(1,4,6)
+ ,argv
+#endif
+ )) {
+ xtables_error(PARAMETER_PROBLEM, "Unexpected `!' after --to");
+ }
+ if (0 != (IP6T_MAP66_OPT_TO & *flags)) {
+ xtables_error(PARAMETER_PROBLEM, "Multiple --to not supported");
+ }
+ *flags |= IP6T_MAP66_OPT_TO;
+ if (NULL == (p = strchr(optarg, '/'))) {
+ xtables_error(PARAMETER_PROBLEM, "Missing '/' character in --to: \"%s\"", optarg);
+ }
+ *p = '\0';
+ if (1 != inet_pton(AF_INET6, optarg, &info->prefix)) {
+ xtables_error(PARAMETER_PROBLEM, "Invalid IPv6 address in --to: \"%s\"", optarg);
+ }
+ i = atoi(p + 1);
+ if (0 >= i || 128 <= i || 0 != i % 16) {
+ xtables_error(PARAMETER_PROBLEM, "Invalid prefix length in --to: \"%s\" (use /112, /96 .. /16)", p + 1);
+ }
+ info->prefixlength = i / 16;
+ info->prefixcsum = ~csum16((const u_int16_t *)&info->prefix, info->prefixlength);
+ return 1;
+ break;
+ case '2':
+ if (0 != (IP6T_MAP66_OPT_NOSPOOF & *flags)) {
+ xtables_error(PARAMETER_PROBLEM, "Multiple --nospoof not supported");
+ }
+ info->mapflags |= IP6T_MAP66_OPT_NOSPOOF;
+ *flags |= IP6T_MAP66_OPT_NOSPOOF;
+ return 1;
+ break;
+ }
+ return 0;
+}
+
+static void MAP66_check(unsigned int flags)
+{
+ if (!(flags & IP6T_MAP66_OPT_TO)) {
+ xtables_error(PARAMETER_PROBLEM, "You must specify --to");
+ }
+}
+
+static void MAP66_save(
+ const void_ip6 *ip,
+ const struct xt_entry_target *target)
+{
+ char s[50+1];
+ const struct ip6t_MAP66_info* info = (struct ip6t_MAP66_info*)target->data;
+ printf("--to %s/%d ", inet_ntop(AF_INET6, &info->prefix, s, sizeof(s)), 16 * info->prefixlength);
+ if (0 != (IP6T_MAP66_OPT_NOSPOOF & info->mapflags)) printf("--nospoof ");
+}
+
+static struct option MAP66_opts[] = {
+ { .name = "to", .has_arg = 1, .flag = NULL, .val = '1' },
+ { .name = "nospoof", .has_arg = 0, .flag = NULL, .val = '2' },
+ { .name = NULL }
+};
+
+static struct xtables_target MAP66_tg6_reg = {
+ .name = "MAP66",
+ .version = XTABLES_VERSION,
+#if IPTABLES_VERSION_CODE >= IPTABLES_VERSION_CMP(1,4,1)
+ .family = NFPROTO_IPV6,
+#endif
+ .size = XT_ALIGN(sizeof(struct ip6t_MAP66_info)),
+ .userspacesize = XT_ALIGN(sizeof(struct ip6t_MAP66_info)),
+ .help = MAP66_help,
+ .parse = MAP66_parse,
+ .final_check = MAP66_check,
+ .save = MAP66_save,
+ .extra_opts = MAP66_opts,
+};
+
+void _init(void)
+{
+ xtables_register_target(&MAP66_tg6_reg);
+}