aboutsummaryrefslogtreecommitdiff
path: root/net/netfilter
diff options
context:
space:
mode:
Diffstat (limited to 'net/netfilter')
-rw-r--r--net/netfilter/Kconfig15
-rw-r--r--net/netfilter/Makefile3
-rw-r--r--net/netfilter/nf_tproxy_core.c96
3 files changed, 114 insertions, 0 deletions
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 4a464857f21..ed1dcfb61e1 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -287,6 +287,21 @@ config NF_CT_NETLINK
help
This option enables support for a netlink-based userspace interface
+# transparent proxy support
+config NETFILTER_TPROXY
+ tristate "Transparent proxying support (EXPERIMENTAL)"
+ depends on EXPERIMENTAL
+ depends on IP_NF_MANGLE
+ depends on NETFILTER_ADVANCED
+ help
+ This option enables transparent proxying support, that is,
+ support for handling non-locally bound IPv4 TCP and UDP sockets.
+ For it to work you will have to configure certain iptables rules
+ and use policy routing. For more information on how to set it up
+ see Documentation/networking/tproxy.txt.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
config NETFILTER_XTABLES
tristate "Netfilter Xtables support (required for ip_tables)"
default m if NETFILTER_ADVANCED=n
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index f101cf61e6f..fc8bbb48d38 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -34,6 +34,9 @@ obj-$(CONFIG_NF_CONNTRACK_SANE) += nf_conntrack_sane.o
obj-$(CONFIG_NF_CONNTRACK_SIP) += nf_conntrack_sip.o
obj-$(CONFIG_NF_CONNTRACK_TFTP) += nf_conntrack_tftp.o
+# transparent proxy support
+obj-$(CONFIG_NETFILTER_TPROXY) += nf_tproxy_core.o
+
# generic X tables
obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
diff --git a/net/netfilter/nf_tproxy_core.c b/net/netfilter/nf_tproxy_core.c
new file mode 100644
index 00000000000..fe34f4bf74c
--- /dev/null
+++ b/net/netfilter/nf_tproxy_core.c
@@ -0,0 +1,96 @@
+/*
+ * Transparent proxy support for Linux/iptables
+ *
+ * Copyright (c) 2006-2007 BalaBit IT Ltd.
+ * Author: Balazs Scheidler, 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/version.h>
+#include <linux/module.h>
+
+#include <linux/net.h>
+#include <linux/if.h>
+#include <linux/netdevice.h>
+#include <net/udp.h>
+#include <net/netfilter/nf_tproxy_core.h>
+
+struct sock *
+nf_tproxy_get_sock_v4(struct net *net, const u8 protocol,
+ const __be32 saddr, const __be32 daddr,
+ const __be16 sport, const __be16 dport,
+ const struct net_device *in, bool listening_only)
+{
+ struct sock *sk;
+
+ /* look up socket */
+ switch (protocol) {
+ case IPPROTO_TCP:
+ if (listening_only)
+ sk = __inet_lookup_listener(net, &tcp_hashinfo,
+ daddr, ntohs(dport),
+ in->ifindex);
+ else
+ sk = __inet_lookup(net, &tcp_hashinfo,
+ saddr, sport, daddr, dport,
+ in->ifindex);
+ break;
+ case IPPROTO_UDP:
+ sk = udp4_lib_lookup(net, saddr, sport, daddr, dport,
+ in->ifindex);
+ break;
+ default:
+ WARN_ON(1);
+ sk = NULL;
+ }
+
+ pr_debug("tproxy socket lookup: proto %u %08x:%u -> %08x:%u, listener only: %d, sock %p\n",
+ protocol, ntohl(saddr), ntohs(sport), ntohl(daddr), ntohs(dport), listening_only, sk);
+
+ return sk;
+}
+EXPORT_SYMBOL_GPL(nf_tproxy_get_sock_v4);
+
+static void
+nf_tproxy_destructor(struct sk_buff *skb)
+{
+ struct sock *sk = skb->sk;
+
+ skb->sk = NULL;
+ skb->destructor = NULL;
+
+ if (sk)
+ nf_tproxy_put_sock(sk);
+}
+
+/* consumes sk */
+int
+nf_tproxy_assign_sock(struct sk_buff *skb, struct sock *sk)
+{
+ if (inet_sk(sk)->transparent) {
+ skb->sk = sk;
+ skb->destructor = nf_tproxy_destructor;
+ return 1;
+ } else
+ nf_tproxy_put_sock(sk);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nf_tproxy_assign_sock);
+
+static int __init nf_tproxy_init(void)
+{
+ pr_info("NF_TPROXY: Transparent proxy support initialized, version 4.1.0\n");
+ pr_info("NF_TPROXY: Copyright (c) 2006-2007 BalaBit IT Ltd.\n");
+ return 0;
+}
+
+module_init(nf_tproxy_init);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Krisztian Kovacs");
+MODULE_DESCRIPTION("Transparent proxy support core routines");