[OpenWrt-Devel] [RFC 27/27] kernel: netfilter: chain filters merged into nf_tables.ko

[Hauke Mehrtens]

In mainline kernel commit 02c7b25e5f5 ("netfilter: nf_tables: build-in
filter chain type") all chain filters were merged into one file and into
one kernel module to save some memory. The code protected by these
configuration options CONFIG_NF_TABLES_BRIDGE, CONFIG_NF_TABLES_IPV4,
CONFIG_NF_TABLES_ARP, CONFIG_NF_TABLES_IPV6, CONFIG_NF_TABLES_NETDEV and
CONFIG_NF_TABLES_INET was merged into the nft_chain_filter.c file which
is now always compiled into the nf_tables.ko file.

This only happened in kernel 4.19 and OpenWrt has to select these as
modules in older kennel versions. Mark them as build-in in the kernel
4.19 specific kernel configuration file which will then not be
overwritten by the package specific settings which try to make them
modular again.

Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 include/netfilter.mk                      | 10 +++++-----
 package/kernel/linux/modules/netfilter.mk |  2 +-
 target/linux/generic/config-4.19          | 12 ++++++------
 3 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/include/netfilter.mk b/include/netfilter.mk
index 4b9cc20622..3a7f78a2a6 100644
--- a/include/netfilter.mk
+++ b/include/netfilter.mk
@@ -334,7 +334,7 @@ $(eval $(call nf_add,EBTABLES_WATCHERS,CONFIG_BRIDGE_EBT_NFQUEUE, $(P_EBT)ebt_nf
 
 # nftables
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NF_TABLES, $(P_XT)nf_tables),))
-$(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NF_TABLES_INET, $(P_XT)nf_tables_inet),))
+$(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NF_TABLES_INET, $(P_XT)nf_tables_inet, lt 4.17),))
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NFT_EXTHDR, $(P_XT)nft_exthdr),))
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NFT_META, $(P_XT)nft_meta),))
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NFT_NUMGEN, $(P_XT)nft_numgen, ge 4.9.0),))
@@ -348,16 +348,16 @@ $(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NFT_LOG, $(P_XT)nft_log),))
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NFT_LIMIT, $(P_XT)nft_limit),))
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NFT_REJECT, $(P_XT)nft_reject $(P_V4)nft_reject_ipv4 $(P_V6)nft_reject_ipv6),))
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NFT_REJECT_INET, $(P_XT)nft_reject_inet),))
-$(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NF_TABLES_IPV4, $(P_V4)nf_tables_ipv4),))
+$(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NF_TABLES_IPV4, $(P_V4)nf_tables_ipv4, lt 4.17),))
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NFT_CHAIN_ROUTE_IPV4, $(P_V4)nft_chain_route_ipv4),))
-$(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NF_TABLES_IPV6, $(P_V6)nf_tables_ipv6),))
+$(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NF_TABLES_IPV6, $(P_V6)nf_tables_ipv6, lt 4.17),))
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NFT_CHAIN_ROUTE_IPV6, $(P_V6)nft_chain_route_ipv6),))
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NFT_REDIR, $(P_XT)nft_redir, ge 3.19.0),))
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_CORE,CONFIG_NFT_QUOTA, $(P_XT)nft_quota, ge 4.9.0),))
 
-$(eval $(if $(NF_KMOD),$(call nf_add,NFT_ARP,CONFIG_NF_TABLES_ARP, $(P_V4)nf_tables_arp),))
+$(eval $(if $(NF_KMOD),$(call nf_add,NFT_ARP,CONFIG_NF_TABLES_ARP, $(P_V4)nf_tables_arp, lt 4.17),))
 
-$(eval $(if $(NF_KMOD),$(call nf_add,NFT_BRIDGE,CONFIG_NF_TABLES_BRIDGE, $(P_EBT)nf_tables_bridge),))
+$(eval $(if $(NF_KMOD),$(call nf_add,NFT_BRIDGE,CONFIG_NF_TABLES_BRIDGE, $(P_EBT)nf_tables_bridge, lt 4.17),))
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_BRIDGE,CONFIG_NFT_BRIDGE_META, $(P_EBT)nft_meta_bridge),))
 $(eval $(if $(NF_KMOD),$(call nf_add,NFT_BRIDGE,CONFIG_NFT_BRIDGE_REJECT, $(P_EBT)nft_reject_bridge),))
 
diff --git a/package/kernel/linux/modules/netfilter.mk b/package/kernel/linux/modules/netfilter.mk
index 6daab752f7..0ba66caf7d 100644
--- a/package/kernel/linux/modules/netfilter.mk
+++ b/package/kernel/linux/modules/netfilter.mk
@@ -1156,7 +1156,7 @@ define KernelPackage/nft-netdev
 	CONFIG_NFT_DUP_NETDEV \
 	CONFIG_NFT_FWD_NETDEV
   FILES:= \
-	$(LINUX_DIR)/net/netfilter/nf_tables_netdev.ko \
+	$(LINUX_DIR)/net/netfilter/nf_tables_netdev.ko at lt4.17 \
 	$(LINUX_DIR)/net/netfilter/nf_dup_netdev.ko \
 	$(LINUX_DIR)/net/netfilter/nft_dup_netdev.ko \
 	$(LINUX_DIR)/net/netfilter/nft_fwd_netdev.ko
diff --git a/target/linux/generic/config-4.19 b/target/linux/generic/config-4.19
index 5dec53c0f3..405de27afb 100644
--- a/target/linux/generic/config-4.19
+++ b/target/linux/generic/config-4.19
@@ -3365,12 +3365,12 @@ CONFIG_NF_NAT_MASQUERADE_IPV6=y
 # CONFIG_NF_SOCKET_IPV4 is not set
 # CONFIG_NF_SOCKET_IPV6 is not set
 # CONFIG_NF_TABLES is not set
-# CONFIG_NF_TABLES_ARP is not set
-# CONFIG_NF_TABLES_BRIDGE is not set
-# CONFIG_NF_TABLES_INET is not set
-# CONFIG_NF_TABLES_IPV4 is not set
-# CONFIG_NF_TABLES_IPV6 is not set
-# CONFIG_NF_TABLES_NETDEV is not set
+CONFIG_NF_TABLES_ARP=y
+CONFIG_NF_TABLES_BRIDGE=y
+CONFIG_NF_TABLES_INET=y
+CONFIG_NF_TABLES_IPV4=y
+CONFIG_NF_TABLES_IPV6=y
+CONFIG_NF_TABLES_NETDEV=y
 # CONFIG_NF_TABLES_SET is not set
 # CONFIG_NF_TPROXY_IPV4 is not set
 # CONFIG_NF_TPROXY_IPV6 is not set
-- 
2.11.0


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