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Date: Wed, 3 Dec 2014 13:55:35 +0100
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 05/12] netfilter: combine IPv4 and IPv6 nf_nat_redirect code in one module
This resolves linking problems with CONFIG_IPV6=n:
net/built-in.o: In function `redirect_tg6':
xt_REDIRECT.c:(.text+0x6d021): undefined reference to `nf_nat_redirect_ipv6'
Reported-by: Andreas Ruprecht <rupran@...server.de>
Reported-by: Or Gerlitz <ogerlitz@...lanox.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netfilter/ipv4/nf_nat_redirect.h | 9 --
include/net/netfilter/ipv6/nf_nat_redirect.h | 8 --
include/net/netfilter/nf_nat_redirect.h | 12 +++
net/ipv4/netfilter/Kconfig | 8 +-
net/ipv4/netfilter/Makefile | 1 -
net/ipv4/netfilter/nf_nat_redirect_ipv4.c | 82 -----------------
net/ipv4/netfilter/nft_redir_ipv4.c | 2 +-
net/ipv6/netfilter/Kconfig | 8 +-
net/ipv6/netfilter/Makefile | 1 -
net/ipv6/netfilter/nf_nat_redirect_ipv6.c | 75 ---------------
net/ipv6/netfilter/nft_redir_ipv6.c | 2 +-
net/netfilter/Kconfig | 10 +-
net/netfilter/Makefile | 1 +
net/netfilter/nf_nat_redirect.c | 127 ++++++++++++++++++++++++++
net/netfilter/xt_REDIRECT.c | 3 +-
15 files changed, 153 insertions(+), 196 deletions(-)
delete mode 100644 include/net/netfilter/ipv4/nf_nat_redirect.h
delete mode 100644 include/net/netfilter/ipv6/nf_nat_redirect.h
create mode 100644 include/net/netfilter/nf_nat_redirect.h
delete mode 100644 net/ipv4/netfilter/nf_nat_redirect_ipv4.c
delete mode 100644 net/ipv6/netfilter/nf_nat_redirect_ipv6.c
create mode 100644 net/netfilter/nf_nat_redirect.c
diff --git a/include/net/netfilter/ipv4/nf_nat_redirect.h b/include/net/netfilter/ipv4/nf_nat_redirect.h
deleted file mode 100644
index 19e1df3..0000000
--- a/include/net/netfilter/ipv4/nf_nat_redirect.h
+++ /dev/null
@@ -1,9 +0,0 @@
-#ifndef _NF_NAT_REDIRECT_IPV4_H_
-#define _NF_NAT_REDIRECT_IPV4_H_
-
-unsigned int
-nf_nat_redirect_ipv4(struct sk_buff *skb,
- const struct nf_nat_ipv4_multi_range_compat *mr,
- unsigned int hooknum);
-
-#endif /* _NF_NAT_REDIRECT_IPV4_H_ */
diff --git a/include/net/netfilter/ipv6/nf_nat_redirect.h b/include/net/netfilter/ipv6/nf_nat_redirect.h
deleted file mode 100644
index 1ebdffc..0000000
--- a/include/net/netfilter/ipv6/nf_nat_redirect.h
+++ /dev/null
@@ -1,8 +0,0 @@
-#ifndef _NF_NAT_REDIRECT_IPV6_H_
-#define _NF_NAT_REDIRECT_IPV6_H_
-
-unsigned int
-nf_nat_redirect_ipv6(struct sk_buff *skb, const struct nf_nat_range *range,
- unsigned int hooknum);
-
-#endif /* _NF_NAT_REDIRECT_IPV6_H_ */
diff --git a/include/net/netfilter/nf_nat_redirect.h b/include/net/netfilter/nf_nat_redirect.h
new file mode 100644
index 0000000..73b7295
--- /dev/null
+++ b/include/net/netfilter/nf_nat_redirect.h
@@ -0,0 +1,12 @@
+#ifndef _NF_NAT_REDIRECT_H_
+#define _NF_NAT_REDIRECT_H_
+
+unsigned int
+nf_nat_redirect_ipv4(struct sk_buff *skb,
+ const struct nf_nat_ipv4_multi_range_compat *mr,
+ unsigned int hooknum);
+unsigned int
+nf_nat_redirect_ipv6(struct sk_buff *skb, const struct nf_nat_range *range,
+ unsigned int hooknum);
+
+#endif /* _NF_NAT_REDIRECT_H_ */
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 8358b2d..59f883d 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -104,12 +104,6 @@ config NF_NAT_MASQUERADE_IPV4
This is the kernel functionality to provide NAT in the masquerade
flavour (automatic source address selection).
-config NF_NAT_REDIRECT_IPV4
- tristate "IPv4 redirect support"
- help
- This is the kernel functionality to provide NAT in the redirect
- flavour (redirect packets to local machine).
-
config NFT_MASQ_IPV4
tristate "IPv4 masquerading support for nf_tables"
depends on NF_TABLES_IPV4
@@ -123,7 +117,7 @@ config NFT_REDIR_IPV4
tristate "IPv4 redirect support for nf_tables"
depends on NF_TABLES_IPV4
depends on NFT_REDIR
- select NF_NAT_REDIRECT_IPV4
+ select NF_NAT_REDIRECT
help
This is the expression that provides IPv4 redirect support for
nf_tables.
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 902bcd1..7fe6c70 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -31,7 +31,6 @@ obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323.o
obj-$(CONFIG_NF_NAT_PPTP) += nf_nat_pptp.o
obj-$(CONFIG_NF_NAT_SNMP_BASIC) += nf_nat_snmp_basic.o
obj-$(CONFIG_NF_NAT_MASQUERADE_IPV4) += nf_nat_masquerade_ipv4.o
-obj-$(CONFIG_NF_NAT_REDIRECT_IPV4) += nf_nat_redirect_ipv4.o
# NAT protocols (nf_nat)
obj-$(CONFIG_NF_NAT_PROTO_GRE) += nf_nat_proto_gre.o
diff --git a/net/ipv4/netfilter/nf_nat_redirect_ipv4.c b/net/ipv4/netfilter/nf_nat_redirect_ipv4.c
deleted file mode 100644
index a220552..0000000
--- a/net/ipv4/netfilter/nf_nat_redirect_ipv4.c
+++ /dev/null
@@ -1,82 +0,0 @@
-/*
- * (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2006 Netfilter Core Team <coreteam@...filter.org>
- * Copyright (c) 2011 Patrick McHardy <kaber@...sh.net>
- *
- * 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.
- *
- * Based on Rusty Russell's IPv4 REDIRECT target. Development of IPv6
- * NAT funded by Astaro.
- */
-
-#include <linux/if.h>
-#include <linux/inetdevice.h>
-#include <linux/ip.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/netdevice.h>
-#include <linux/netfilter.h>
-#include <linux/types.h>
-#include <linux/netfilter_ipv4.h>
-#include <linux/netfilter/x_tables.h>
-#include <net/addrconf.h>
-#include <net/checksum.h>
-#include <net/protocol.h>
-#include <net/netfilter/nf_nat.h>
-#include <net/netfilter/ipv4/nf_nat_redirect.h>
-
-unsigned int
-nf_nat_redirect_ipv4(struct sk_buff *skb,
- const struct nf_nat_ipv4_multi_range_compat *mr,
- unsigned int hooknum)
-{
- struct nf_conn *ct;
- enum ip_conntrack_info ctinfo;
- __be32 newdst;
- struct nf_nat_range newrange;
-
- NF_CT_ASSERT(hooknum == NF_INET_PRE_ROUTING ||
- hooknum == NF_INET_LOCAL_OUT);
-
- ct = nf_ct_get(skb, &ctinfo);
- NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
-
- /* Local packets: make them go to loopback */
- if (hooknum == NF_INET_LOCAL_OUT) {
- newdst = htonl(0x7F000001);
- } else {
- struct in_device *indev;
- struct in_ifaddr *ifa;
-
- newdst = 0;
-
- rcu_read_lock();
- indev = __in_dev_get_rcu(skb->dev);
- if (indev != NULL) {
- ifa = indev->ifa_list;
- newdst = ifa->ifa_local;
- }
- rcu_read_unlock();
-
- if (!newdst)
- return NF_DROP;
- }
-
- /* Transfer from original range. */
- memset(&newrange.min_addr, 0, sizeof(newrange.min_addr));
- memset(&newrange.max_addr, 0, sizeof(newrange.max_addr));
- newrange.flags = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS;
- newrange.min_addr.ip = newdst;
- newrange.max_addr.ip = newdst;
- newrange.min_proto = mr->range[0].min;
- newrange.max_proto = mr->range[0].max;
-
- /* Hand modified range to generic setup. */
- return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST);
-}
-EXPORT_SYMBOL_GPL(nf_nat_redirect_ipv4);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Patrick McHardy <kaber@...sh.net>");
diff --git a/net/ipv4/netfilter/nft_redir_ipv4.c b/net/ipv4/netfilter/nft_redir_ipv4.c
index 643c596..ff2d23d 100644
--- a/net/ipv4/netfilter/nft_redir_ipv4.c
+++ b/net/ipv4/netfilter/nft_redir_ipv4.c
@@ -14,7 +14,7 @@
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_nat.h>
-#include <net/netfilter/ipv4/nf_nat_redirect.h>
+#include <net/netfilter/nf_nat_redirect.h>
#include <net/netfilter/nft_redir.h>
static void nft_redir_ipv4_eval(const struct nft_expr *expr,
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 0dbe5c7..a069822 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -82,12 +82,6 @@ config NF_NAT_MASQUERADE_IPV6
This is the kernel functionality to provide NAT in the masquerade
flavour (automatic source address selection) for IPv6.
-config NF_NAT_REDIRECT_IPV6
- tristate "IPv6 redirect support"
- help
- This is the kernel functionality to provide NAT in the redirect
- flavour (redirect packet to local machine) for IPv6.
-
config NFT_MASQ_IPV6
tristate "IPv6 masquerade support for nf_tables"
depends on NF_TABLES_IPV6
@@ -101,7 +95,7 @@ config NFT_REDIR_IPV6
tristate "IPv6 redirect support for nf_tables"
depends on NF_TABLES_IPV6
depends on NFT_REDIR
- select NF_NAT_REDIRECT_IPV6
+ select NF_NAT_REDIRECT
help
This is the expression that provides IPv4 redirect support for
nf_tables.
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index d2ac9f5..c36e0a5 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -19,7 +19,6 @@ obj-$(CONFIG_NF_CONNTRACK_IPV6) += nf_conntrack_ipv6.o
nf_nat_ipv6-y := nf_nat_l3proto_ipv6.o nf_nat_proto_icmpv6.o
obj-$(CONFIG_NF_NAT_IPV6) += nf_nat_ipv6.o
obj-$(CONFIG_NF_NAT_MASQUERADE_IPV6) += nf_nat_masquerade_ipv6.o
-obj-$(CONFIG_NF_NAT_REDIRECT_IPV6) += nf_nat_redirect_ipv6.o
# defrag
nf_defrag_ipv6-y := nf_defrag_ipv6_hooks.o nf_conntrack_reasm.o
diff --git a/net/ipv6/netfilter/nf_nat_redirect_ipv6.c b/net/ipv6/netfilter/nf_nat_redirect_ipv6.c
deleted file mode 100644
index ea1308a..0000000
--- a/net/ipv6/netfilter/nf_nat_redirect_ipv6.c
+++ /dev/null
@@ -1,75 +0,0 @@
-/*
- * (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2006 Netfilter Core Team <coreteam@...filter.org>
- * Copyright (c) 2011 Patrick McHardy <kaber@...sh.net>
- *
- * 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.
- *
- * Based on Rusty Russell's IPv4 REDIRECT target. Development of IPv6
- * NAT funded by Astaro.
- */
-
-#include <linux/if.h>
-#include <linux/inetdevice.h>
-#include <linux/ip.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/netdevice.h>
-#include <linux/netfilter.h>
-#include <linux/types.h>
-#include <linux/netfilter_ipv6.h>
-#include <linux/netfilter/x_tables.h>
-#include <net/addrconf.h>
-#include <net/checksum.h>
-#include <net/protocol.h>
-#include <net/netfilter/nf_nat.h>
-#include <net/netfilter/ipv6/nf_nat_redirect.h>
-
-static const struct in6_addr loopback_addr = IN6ADDR_LOOPBACK_INIT;
-
-unsigned int
-nf_nat_redirect_ipv6(struct sk_buff *skb, const struct nf_nat_range *range,
- unsigned int hooknum)
-{
- struct nf_nat_range newrange;
- struct in6_addr newdst;
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct;
-
- ct = nf_ct_get(skb, &ctinfo);
- if (hooknum == NF_INET_LOCAL_OUT) {
- newdst = loopback_addr;
- } else {
- struct inet6_dev *idev;
- struct inet6_ifaddr *ifa;
- bool addr = false;
-
- rcu_read_lock();
- idev = __in6_dev_get(skb->dev);
- if (idev != NULL) {
- list_for_each_entry(ifa, &idev->addr_list, if_list) {
- newdst = ifa->addr;
- addr = true;
- break;
- }
- }
- rcu_read_unlock();
-
- if (!addr)
- return NF_DROP;
- }
-
- newrange.flags = range->flags | NF_NAT_RANGE_MAP_IPS;
- newrange.min_addr.in6 = newdst;
- newrange.max_addr.in6 = newdst;
- newrange.min_proto = range->min_proto;
- newrange.max_proto = range->max_proto;
-
- return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST);
-}
-EXPORT_SYMBOL_GPL(nf_nat_redirect_ipv6);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Patrick McHardy <kaber@...sh.net>");
diff --git a/net/ipv6/netfilter/nft_redir_ipv6.c b/net/ipv6/netfilter/nft_redir_ipv6.c
index 83420ee..2433a6b 100644
--- a/net/ipv6/netfilter/nft_redir_ipv6.c
+++ b/net/ipv6/netfilter/nft_redir_ipv6.c
@@ -15,7 +15,7 @@
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nft_redir.h>
-#include <net/netfilter/ipv6/nf_nat_redirect.h>
+#include <net/netfilter/nf_nat_redirect.h>
static void nft_redir_ipv6_eval(const struct nft_expr *expr,
struct nft_data data[NFT_REG_MAX + 1],
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 57f15a9..b02660f 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -411,6 +411,13 @@ config NF_NAT_TFTP
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_TFTP
+config NF_NAT_REDIRECT
+ tristate "IPv4/IPv6 redirect support"
+ depends on NF_NAT
+ help
+ This is the kernel functionality to redirect packets to local
+ machine through NAT.
+
config NETFILTER_SYNPROXY
tristate
@@ -844,8 +851,7 @@ config NETFILTER_XT_TARGET_RATEEST
config NETFILTER_XT_TARGET_REDIRECT
tristate "REDIRECT target support"
depends on NF_NAT
- select NF_NAT_REDIRECT_IPV4 if NF_NAT_IPV4
- select NF_NAT_REDIRECT_IPV6 if NF_NAT_IPV6
+ select NF_NAT_REDIRECT
---help---
REDIRECT is a special case of NAT: all incoming connections are
mapped onto the incoming interface's address, causing the packets to
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index f3eb468..89f73a9 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -51,6 +51,7 @@ nf_nat-y := nf_nat_core.o nf_nat_proto_unknown.o nf_nat_proto_common.o \
obj-$(CONFIG_NF_LOG_COMMON) += nf_log_common.o
obj-$(CONFIG_NF_NAT) += nf_nat.o
+obj-$(CONFIG_NF_NAT_REDIRECT) += nf_nat_redirect.o
# NAT protocols (nf_nat)
obj-$(CONFIG_NF_NAT_PROTO_DCCP) += nf_nat_proto_dccp.o
diff --git a/net/netfilter/nf_nat_redirect.c b/net/netfilter/nf_nat_redirect.c
new file mode 100644
index 0000000..97b75f9
--- /dev/null
+++ b/net/netfilter/nf_nat_redirect.c
@@ -0,0 +1,127 @@
+/*
+ * (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2006 Netfilter Core Team <coreteam@...filter.org>
+ * Copyright (c) 2011 Patrick McHardy <kaber@...sh.net>
+ *
+ * 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.
+ *
+ * Based on Rusty Russell's IPv4 REDIRECT target. Development of IPv6
+ * NAT funded by Astaro.
+ */
+
+#include <linux/if.h>
+#include <linux/inetdevice.h>
+#include <linux/ip.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/netfilter.h>
+#include <linux/types.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/netfilter/x_tables.h>
+#include <net/addrconf.h>
+#include <net/checksum.h>
+#include <net/protocol.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_redirect.h>
+
+unsigned int
+nf_nat_redirect_ipv4(struct sk_buff *skb,
+ const struct nf_nat_ipv4_multi_range_compat *mr,
+ unsigned int hooknum)
+{
+ struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
+ __be32 newdst;
+ struct nf_nat_range newrange;
+
+ NF_CT_ASSERT(hooknum == NF_INET_PRE_ROUTING ||
+ hooknum == NF_INET_LOCAL_OUT);
+
+ ct = nf_ct_get(skb, &ctinfo);
+ NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
+
+ /* Local packets: make them go to loopback */
+ if (hooknum == NF_INET_LOCAL_OUT) {
+ newdst = htonl(0x7F000001);
+ } else {
+ struct in_device *indev;
+ struct in_ifaddr *ifa;
+
+ newdst = 0;
+
+ rcu_read_lock();
+ indev = __in_dev_get_rcu(skb->dev);
+ if (indev != NULL) {
+ ifa = indev->ifa_list;
+ newdst = ifa->ifa_local;
+ }
+ rcu_read_unlock();
+
+ if (!newdst)
+ return NF_DROP;
+ }
+
+ /* Transfer from original range. */
+ memset(&newrange.min_addr, 0, sizeof(newrange.min_addr));
+ memset(&newrange.max_addr, 0, sizeof(newrange.max_addr));
+ newrange.flags = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS;
+ newrange.min_addr.ip = newdst;
+ newrange.max_addr.ip = newdst;
+ newrange.min_proto = mr->range[0].min;
+ newrange.max_proto = mr->range[0].max;
+
+ /* Hand modified range to generic setup. */
+ return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST);
+}
+EXPORT_SYMBOL_GPL(nf_nat_redirect_ipv4);
+
+static const struct in6_addr loopback_addr = IN6ADDR_LOOPBACK_INIT;
+
+unsigned int
+nf_nat_redirect_ipv6(struct sk_buff *skb, const struct nf_nat_range *range,
+ unsigned int hooknum)
+{
+ struct nf_nat_range newrange;
+ struct in6_addr newdst;
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct;
+
+ ct = nf_ct_get(skb, &ctinfo);
+ if (hooknum == NF_INET_LOCAL_OUT) {
+ newdst = loopback_addr;
+ } else {
+ struct inet6_dev *idev;
+ struct inet6_ifaddr *ifa;
+ bool addr = false;
+
+ rcu_read_lock();
+ idev = __in6_dev_get(skb->dev);
+ if (idev != NULL) {
+ list_for_each_entry(ifa, &idev->addr_list, if_list) {
+ newdst = ifa->addr;
+ addr = true;
+ break;
+ }
+ }
+ rcu_read_unlock();
+
+ if (!addr)
+ return NF_DROP;
+ }
+
+ newrange.flags = range->flags | NF_NAT_RANGE_MAP_IPS;
+ newrange.min_addr.in6 = newdst;
+ newrange.max_addr.in6 = newdst;
+ newrange.min_proto = range->min_proto;
+ newrange.max_proto = range->max_proto;
+
+ return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST);
+}
+EXPORT_SYMBOL_GPL(nf_nat_redirect_ipv6);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Patrick McHardy <kaber@...sh.net>");
diff --git a/net/netfilter/xt_REDIRECT.c b/net/netfilter/xt_REDIRECT.c
index b6ec67e..03f0b37 100644
--- a/net/netfilter/xt_REDIRECT.c
+++ b/net/netfilter/xt_REDIRECT.c
@@ -26,8 +26,7 @@
#include <net/checksum.h>
#include <net/protocol.h>
#include <net/netfilter/nf_nat.h>
-#include <net/netfilter/ipv4/nf_nat_redirect.h>
-#include <net/netfilter/ipv6/nf_nat_redirect.h>
+#include <net/netfilter/nf_nat_redirect.h>
static unsigned int
redirect_tg6(struct sk_buff *skb, const struct xt_action_param *par)
--
1.7.10.4
--
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