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Message-ID: <20070305154702.3471.25476.stgit@nienna.balabit>
Date: Mon, 05 Mar 2007 16:47:02 +0100
From: KOVACS Krisztian <hidden@...abit.hu>
To: netdev@...r.kernel.org
Subject: [PATCH/RFC 13/13] iptables tproxy match
Implements an iptables module which matches packets which have the
tproxy flag set, that is, packets diverted in the tproxy table.
Signed-off-by: KOVACS Krisztian <hidden@...abit.hu>
---
net/netfilter/Kconfig | 9 +++++
net/netfilter/Makefile | 1 +
net/netfilter/xt_tproxy.c | 77 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 87 insertions(+), 0 deletions(-)
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 253fce3..b22346e 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -603,6 +603,15 @@ config NETFILTER_XT_MATCH_QUOTA
If you want to compile it as a module, say M here and read
<file:Documentation/modules.txt>. If unsure, say `N'.
+config NETFILTER_XT_MATCH_TPROXY
+ tristate '"tproxy" match support'
+ depends on NETFILTER_XTABLES
+ help
+ This option adds a `tproxy' match, which allows you to match
+ packets which have been diverted to local sockets by TProxy.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
config NETFILTER_XT_MATCH_REALM
tristate '"realm" match support'
depends on NETFILTER_XTABLES
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index b2b5c75..83b2fd9 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -64,6 +64,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_MARK) += xt_mark.o
obj-$(CONFIG_NETFILTER_XT_MATCH_MULTIPORT) += xt_multiport.o
obj-$(CONFIG_NETFILTER_XT_MATCH_POLICY) += xt_policy.o
obj-$(CONFIG_NETFILTER_XT_MATCH_PKTTYPE) += xt_pkttype.o
+obj-$(CONFIG_NETFILTER_XT_MATCH_TPROXY) += xt_tproxy.o
obj-$(CONFIG_NETFILTER_XT_MATCH_QUOTA) += xt_quota.o
obj-$(CONFIG_NETFILTER_XT_MATCH_REALM) += xt_realm.o
obj-$(CONFIG_NETFILTER_XT_MATCH_SCTP) += xt_sctp.o
diff --git a/net/netfilter/xt_tproxy.c b/net/netfilter/xt_tproxy.c
new file mode 100644
index 0000000..53f8bee
--- /dev/null
+++ b/net/netfilter/xt_tproxy.c
@@ -0,0 +1,77 @@
+/*
+ * Transparent proxy support for Linux/iptables
+ *
+ * Copyright (c) 2007 BalaBit IT Ltd.
+ * Author: Krisztian Kovacs
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter/x_tables.h>
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const struct xt_match *match,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ return skb->ip_tproxy;
+}
+
+static int
+check(const char *tablename,
+ const void *entry,
+ const struct xt_match *match,
+ void *matchinfo,
+ unsigned int hook_mask)
+{
+ return 1;
+}
+
+static struct xt_match tproxy_matches[] = {
+ {
+ .name = "tproxy",
+ .match = match,
+ .matchsize = 0,
+ .checkentry = check,
+ .family = AF_INET,
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "tproxy",
+ .match = match,
+ .matchsize = 0,
+ .checkentry = check,
+ .family = AF_INET6,
+ .me = THIS_MODULE,
+ },
+};
+
+static int __init xt_tproxy_init(void)
+{
+ return xt_register_matches(tproxy_matches, ARRAY_SIZE(tproxy_matches));
+}
+
+static void __exit xt_tproxy_fini(void)
+{
+ xt_unregister_matches(tproxy_matches, ARRAY_SIZE(tproxy_matches));
+}
+
+module_init(xt_tproxy_init);
+module_exit(xt_tproxy_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Krisztian Kovacs <hidden@...abit.hu>");
+MODULE_DESCRIPTION("iptables tproxy match module");
+MODULE_ALIAS("ipt_tproxy");
+MODULE_ALIAS("ip6t_tproxy");
-
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