From d8748e537f11ab5f2b5e2ed25d94baa5ce353984 Mon Sep 17 00:00:00 2001
From: Alin Nastac <alin.nastac@gmail.com>
Date: Fri, 16 Jun 2017 14:16:07 +0200
Subject: netfilter: add iptables-mod-rpfilter package

Unlike /proc/sys/net/ipv4/conf/INTF/rp_filter flag, rule iptables -t raw
-I PREROUTING -m rpfilter --invert -j DROP prevents conntrack table to
become full when a packet flood with randomly selected source IP addresses
is received from the lan side.

Signed-off-by: Alin Nastac <alin.nastac@gmail.com>
---
 package/kernel/linux/modules/netfilter.mk | 18 ++++++++++++++++++
 package/network/utils/iptables/Makefile   | 14 ++++++++++++++
 2 files changed, 32 insertions(+)

(limited to 'package')

diff --git a/package/kernel/linux/modules/netfilter.mk b/package/kernel/linux/modules/netfilter.mk
index 6162dbc362..a34a9e4207 100644
--- a/package/kernel/linux/modules/netfilter.mk
+++ b/package/kernel/linux/modules/netfilter.mk
@@ -836,6 +836,24 @@ endef
 
 $(eval $(call KernelPackage,ipt-hashlimit))
 
+define KernelPackage/ipt-rpfilter
+  SUBMENU:=$(NF_MENU)
+  TITLE:=Netfilter rpfilter match
+  DEPENDS:=+kmod-ipt-core
+  KCONFIG:=$(KCONFIG_IPT_RPFILTER)
+  FILES:=$(realpath \
+	$(LINUX_DIR)/net/ipv4/netfilter/ipt_rpfilter.ko \
+	$(LINUX_DIR)/net/ipv6/netfilter/ip6t_rpfilter.ko)
+  AUTOLOAD:=$(call AutoProbe,ipt_rpfilter ip6t_rpfilter)
+  $(call KernelPackage/ipt)
+endef
+
+define KernelPackage/ipt-rpfilter/description
+ Kernel modules support for the Netfilter rpfilter match
+endef
+
+$(eval $(call KernelPackage,ipt-rpfilter))
+
 
 define KernelPackage/nft-core
   SUBMENU:=$(NF_MENU)
diff --git a/package/network/utils/iptables/Makefile b/package/network/utils/iptables/Makefile
index ca8b1976aa..89f4354d07 100644
--- a/package/network/utils/iptables/Makefile
+++ b/package/network/utils/iptables/Makefile
@@ -242,6 +242,19 @@ iptables extensions for hashlimit matching
 
 endef
 
+define Package/iptables-mod-rpfilter
+$(call Package/iptables/Module, +kmod-ipt-rpfilter)
+  TITLE:=rpfilter iptables extension
+endef
+
+define Package/iptables-mod-rpfilter/description
+iptables extensions for reverse path filter test on a packet
+
+ Matches:
+  - rpfilter
+
+endef
+
 define Package/iptables-mod-iprange
 $(call Package/iptables/Module, +kmod-ipt-iprange)
   TITLE:=IP range extension
@@ -565,6 +578,7 @@ $(eval $(call BuildPlugin,iptables-mod-cluster,$(IPT_CLUSTER-m)))
 $(eval $(call BuildPlugin,iptables-mod-clusterip,$(IPT_CLUSTERIP-m)))
 $(eval $(call BuildPlugin,iptables-mod-ulog,$(IPT_ULOG-m)))
 $(eval $(call BuildPlugin,iptables-mod-hashlimit,$(IPT_HASHLIMIT-m)))
+$(eval $(call BuildPlugin,iptables-mod-rpfilter,$(IPT_RPFILTER-m)))
 $(eval $(call BuildPlugin,iptables-mod-led,$(IPT_LED-m)))
 $(eval $(call BuildPlugin,iptables-mod-tproxy,$(IPT_TPROXY-m)))
 $(eval $(call BuildPlugin,iptables-mod-tee,$(IPT_TEE-m)))
-- 
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