[RFC net-next 5/6] net: ILA iptables target

[Tom Herbert <tom@herbertland.com>]

Add two target ILAIN and ILAOUT which hook into the ILA module.

Signed-off-by: Tom Herbert <tom@herbertland.com>
---
 net/netfilter/Kconfig  | 11 +++++++
 net/netfilter/Makefile |  1 +
 net/netfilter/xt_ILA.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 94 insertions(+)
 create mode 100644 net/netfilter/xt_ILA.c

diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index fbc8d15..eaf7d68 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -748,6 +748,17 @@ config NETFILTER_XT_TARGET_IDLETIMER
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
+config NETFILTER_XT_TARGET_ILA
+	tristate "ILA target support"
+	depends on IP_NF_MANGLE || IP6_NF_MANGLE
+	depends on NETFILTER_ADVANCED
+	help
+	  This option adds an `ILA' target, which allow Identifier Locator
+	  Addressing (ILA) translations. The ILA tables are managed by the
+	  ILA module.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
 config NETFILTER_XT_TARGET_LED
 	tristate '"LED" target support'
 	depends on LEDS_CLASS && LEDS_TRIGGERS
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 70d026d..d99740a 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -124,6 +124,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_TCPOPTSTRIP) += xt_TCPOPTSTRIP.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_TEE) += xt_TEE.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_TRACE) += xt_TRACE.o
 obj-$(CONFIG_NETFILTER_XT_TARGET_IDLETIMER) += xt_IDLETIMER.o
+obj-$(CONFIG_NETFILTER_XT_TARGET_ILA) += xt_ILA.o
 
 # matches
 obj-$(CONFIG_NETFILTER_XT_MATCH_ADDRTYPE) += xt_addrtype.o
diff --git a/net/netfilter/xt_ILA.c b/net/netfilter/xt_ILA.c
new file mode 100644
index 0000000..0d92c8f
--- /dev/null
+++ b/net/netfilter/xt_ILA.c
@@ -0,0 +1,82 @@
+/* x_tables module for Identifier Locator Addressing (ILA) translation
+ *
+ * (C) 2015 by Tom Herbert <tom@herbertland.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <net/ila.h>
+
+#include <linux/netfilter/x_tables.h>
+
+MODULE_AUTHOR("Tom Herbert <tom@herbertland.com>");
+MODULE_DESCRIPTION("Xtables: ILA translation");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ip6t_ILA");
+MODULE_ALIAS("ip6t_ILAIN");
+MODULE_ALIAS("ip6t_ILAOUT");
+
+static unsigned int
+ila_tg_input(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	ila_xlat_incoming(skb);
+
+	return XT_CONTINUE;
+}
+
+static unsigned int
+ila_tg_output(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	ila_xlat_outgoing(skb);
+
+	return XT_CONTINUE;
+}
+
+static int ila_tg_check(const struct xt_tgchk_param *par)
+{
+	return 0;
+}
+
+static struct xt_target ila_tg_reg[] __read_mostly = {
+	{
+		.name		= "ILAIN",
+		.family		= NFPROTO_IPV6,
+		.checkentry	= ila_tg_check,
+		.target		= ila_tg_input,
+		.targetsize	= 32,
+		.table		= "mangle",
+		.hooks		= (1 << NF_INET_POST_ROUTING) |
+				  (1 << NF_INET_LOCAL_IN),
+		.me		= THIS_MODULE,
+	},
+	{
+		.name		= "ILAOUT",
+		.family		= NFPROTO_IPV6,
+		.checkentry	= ila_tg_check,
+		.target		= ila_tg_output,
+		.targetsize	= 32,
+		.table		= "mangle",
+		.hooks		= (1 << NF_INET_PRE_ROUTING) |
+				  (1 << NF_INET_LOCAL_OUT),
+		.me		= THIS_MODULE,
+	},
+};
+
+static int __init ila_tg_init(void)
+{
+	return xt_register_targets(ila_tg_reg, ARRAY_SIZE(ila_tg_reg));
+}
+
+static void __exit ila_tg_exit(void)
+{
+	xt_unregister_targets(ila_tg_reg, ARRAY_SIZE(ila_tg_reg));
+}
+
+module_init(ila_tg_init);
+module_exit(ila_tg_exit);
-- 
1.8.1