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add netfilter netmap target
git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@1343 3c298f89-4303-0410-b956-a3cf2f4a3e73
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@ -366,6 +366,7 @@ CONFIG_IP_NF_NAT=y
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CONFIG_IP_NF_NAT_NEEDED=y
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CONFIG_IP_NF_TARGET_MASQUERADE=y
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CONFIG_IP_NF_TARGET_REDIRECT=m
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CONFIG_IP_NF_TARGET_NETMAP=m
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CONFIG_IP_NF_NAT_PPTP=m
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CONFIG_IP_NF_NAT_PROTO_GRE=m
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CONFIG_IP_NF_NAT_AMANDA=m
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@ -378,6 +378,7 @@ CONFIG_IP_NF_NAT=y
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CONFIG_IP_NF_NAT_NEEDED=y
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CONFIG_IP_NF_TARGET_MASQUERADE=y
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CONFIG_IP_NF_TARGET_REDIRECT=m
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CONFIG_IP_NF_TARGET_NETMAP=m
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CONFIG_IP_NF_NAT_PPTP=m
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CONFIG_IP_NF_NAT_PROTO_GRE=m
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CONFIG_IP_NF_NAT_AMANDA=m
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@ -0,0 +1,159 @@
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diff -urN linux-2.4.30.orig/Documentation/Configure.help linux-2.4.30/Documentation/Configure.help
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--- linux-2.4.30.orig/Documentation/Configure.help 2005-07-01 02:06:36.000000000 +0200
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+++ linux-2.4.30/Documentation/Configure.help 2005-07-01 00:41:09.000000000 +0200
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@@ -3086,6 +3086,17 @@
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If you want to compile it as a module, say M here and read
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<file:Documentation/modules.txt>. If unsure, say `N'.
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+NETMAP target support
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+CONFIG_IP_NF_TARGET_NETMAP
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+ NETMAP is an implementation of static 1:1 NAT mapping of network
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+ addresses. It maps the network address part, while keeping the
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+ host address part intact. It is similar to Fast NAT, except that
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+ Netfilter's connection tracking doesn't work well with Fast NAT.
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+
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+ If you want to compile it as a module, say M here and read
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+ Documentation/modules.txt. The module will be called
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+ ipt_NETMAP.o. If unsure, say `N'.
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+
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Packet mangling
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CONFIG_IP_NF_MANGLE
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This option adds a `mangle' table to iptables: see the man page for
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diff -urN linux-2.4.30.orig/net/ipv4/netfilter/Config.in linux-2.4.30/net/ipv4/netfilter/Config.in
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--- linux-2.4.30.orig/net/ipv4/netfilter/Config.in 2005-07-01 02:06:35.000000000 +0200
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+++ linux-2.4.30/net/ipv4/netfilter/Config.in 2005-07-01 00:41:09.000000000 +0200
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@@ -69,6 +69,7 @@
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define_bool CONFIG_IP_NF_NAT_NEEDED y
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dep_tristate ' MASQUERADE target support' CONFIG_IP_NF_TARGET_MASQUERADE $CONFIG_IP_NF_NAT
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dep_tristate ' REDIRECT target support' CONFIG_IP_NF_TARGET_REDIRECT $CONFIG_IP_NF_NAT
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+ dep_tristate ' NETMAP target support' CONFIG_IP_NF_TARGET_NETMAP $CONFIG_IP_NF_NAT
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if [ "$CONFIG_IP_NF_PPTP" = "m" ]; then
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define_tristate CONFIG_IP_NF_NAT_PPTP m
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else
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diff -urN linux-2.4.30.orig/net/ipv4/netfilter/ipt_NETMAP.c linux-2.4.30/net/ipv4/netfilter/ipt_NETMAP.c
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--- linux-2.4.30.orig/net/ipv4/netfilter/ipt_NETMAP.c 1970-01-01 01:00:00.000000000 +0100
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+++ linux-2.4.30/net/ipv4/netfilter/ipt_NETMAP.c 2005-07-01 00:41:09.000000000 +0200
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@@ -0,0 +1,112 @@
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+/* NETMAP - static NAT mapping of IP network addresses (1:1).
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+ The mapping can be applied to source (POSTROUTING),
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+ destination (PREROUTING), or both (with separate rules).
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+
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+ Author: Svenning Soerensen <svenning@post5.tele.dk>
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+*/
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+
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+#include <linux/config.h>
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+#include <linux/ip.h>
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+#include <linux/module.h>
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+#include <linux/netdevice.h>
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+#include <linux/netfilter.h>
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+#include <linux/netfilter_ipv4.h>
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+#include <linux/netfilter_ipv4/ip_nat_rule.h>
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+
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+#define MODULENAME "NETMAP"
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+MODULE_LICENSE("GPL");
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+MODULE_AUTHOR("Svenning Soerensen <svenning@post5.tele.dk>");
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+MODULE_DESCRIPTION("iptables 1:1 NAT mapping of IP networks target");
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+
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+#if 0
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+#define DEBUGP printk
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+#else
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+#define DEBUGP(format, args...)
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+#endif
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+
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+static int
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+check(const char *tablename,
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+ const struct ipt_entry *e,
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+ void *targinfo,
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+ unsigned int targinfosize,
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+ unsigned int hook_mask)
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+{
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+ const struct ip_nat_multi_range *mr = targinfo;
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+
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+ if (strcmp(tablename, "nat") != 0) {
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+ DEBUGP(MODULENAME":check: bad table `%s'.\n", tablename);
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+ return 0;
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+ }
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+ if (targinfosize != IPT_ALIGN(sizeof(*mr))) {
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+ DEBUGP(MODULENAME":check: size %u.\n", targinfosize);
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+ return 0;
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+ }
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+ if (hook_mask & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_POST_ROUTING))) {
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+ DEBUGP(MODULENAME":check: bad hooks %x.\n", hook_mask);
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+ return 0;
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+ }
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+ if (!(mr->range[0].flags & IP_NAT_RANGE_MAP_IPS)) {
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+ DEBUGP(MODULENAME":check: bad MAP_IPS.\n");
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+ return 0;
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+ }
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+ if (mr->rangesize != 1) {
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+ DEBUGP(MODULENAME":check: bad rangesize %u.\n", mr->rangesize);
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+ return 0;
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+ }
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+ return 1;
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+}
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+
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+static unsigned int
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+target(struct sk_buff **pskb,
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+ unsigned int hooknum,
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+ const struct net_device *in,
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+ const struct net_device *out,
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+ const void *targinfo,
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+ void *userinfo)
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+{
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+ struct ip_conntrack *ct;
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+ enum ip_conntrack_info ctinfo;
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+ u_int32_t new_ip, netmask;
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+ const struct ip_nat_multi_range *mr = targinfo;
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+ struct ip_nat_multi_range newrange;
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+
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+ IP_NF_ASSERT(hooknum == NF_IP_PRE_ROUTING
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+ || hooknum == NF_IP_POST_ROUTING);
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+ ct = ip_conntrack_get(*pskb, &ctinfo);
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+
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+ netmask = ~(mr->range[0].min_ip ^ mr->range[0].max_ip);
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+
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+ if (hooknum == NF_IP_PRE_ROUTING)
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+ new_ip = (*pskb)->nh.iph->daddr & ~netmask;
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+ else
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+ new_ip = (*pskb)->nh.iph->saddr & ~netmask;
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+ new_ip |= mr->range[0].min_ip & netmask;
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+
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+ newrange = ((struct ip_nat_multi_range)
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+ { 1, { { mr->range[0].flags | IP_NAT_RANGE_MAP_IPS,
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+ new_ip, new_ip,
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+ mr->range[0].min, mr->range[0].max } } });
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+
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+ /* Hand modified range to generic setup. */
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+ return ip_nat_setup_info(ct, &newrange, hooknum);
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+}
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+
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+static struct ipt_target target_module = {
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+ .name = MODULENAME,
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+ .target = target,
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+ .checkentry = check,
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+ .me = THIS_MODULE
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+};
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+
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+static int __init init(void)
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+{
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+ return ipt_register_target(&target_module);
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+}
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+
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+static void __exit fini(void)
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+{
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+ ipt_unregister_target(&target_module);
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+}
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+
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+module_init(init);
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+module_exit(fini);
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diff -urN linux-2.4.30.orig/net/ipv4/netfilter/Makefile linux-2.4.30/net/ipv4/netfilter/Makefile
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--- linux-2.4.30.orig/net/ipv4/netfilter/Makefile 2005-07-01 02:06:35.000000000 +0200
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+++ linux-2.4.30/net/ipv4/netfilter/Makefile 2005-07-01 00:41:09.000000000 +0200
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@@ -110,6 +110,7 @@
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obj-$(CONFIG_IP_NF_TARGET_MARK) += ipt_MARK.o
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obj-$(CONFIG_IP_NF_TARGET_MASQUERADE) += ipt_MASQUERADE.o
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obj-$(CONFIG_IP_NF_TARGET_REDIRECT) += ipt_REDIRECT.o
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+obj-$(CONFIG_IP_NF_TARGET_NETMAP) += ipt_NETMAP.o
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obj-$(CONFIG_IP_NF_NAT_SNMP_BASIC) += ip_nat_snmp_basic.o
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obj-$(CONFIG_IP_NF_TARGET_LOG) += ipt_LOG.o
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obj-$(CONFIG_IP_NF_TARGET_TTL) += ipt_TTL.o
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