diff mbox series

[nf-next,8/9] netfilter: xtables: allow xtables-nft only builds

Message ID 20240129145807.8773-9-fw@strlen.de (mailing list archive)
State Accepted
Commit a9525c7f6219cee9284c0031c5930e8d41384677
Delegated to: Netdev Maintainers
Headers show
Series [nf-next,1/9] netfilter: uapi: Document NFT_TABLE_F_OWNER flag | expand

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netdev/series_format success Pull request is its own cover letter
netdev/tree_selection success Guessed tree name to be net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1048 this patch: 1048
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 0 of 0 maintainers
netdev/build_clang success Errors and warnings before: 1065 this patch: 1065
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1065 this patch: 1065
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 222 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2024-01-31--06-00 (tests: 715)

Commit Message

Florian Westphal Jan. 29, 2024, 2:57 p.m. UTC 
Add hidden IP(6)_NF_IPTABLES_LEGACY symbol.

When any of the "old" builtin tables are enabled the "old" iptables
interface will be supported.

To disable the old set/getsockopt interface the existing options
for the builtin tables need to be turned off:

CONFIG_IP_NF_IPTABLES=m
CONFIG_IP_NF_FILTER is not set
CONFIG_IP_NF_NAT is not set
CONFIG_IP_NF_MANGLE is not set
CONFIG_IP_NF_RAW is not set
CONFIG_IP_NF_SECURITY is not set

Same for CONFIG_IP6_NF_ variants.

This allows to build a kernel that only supports ip(6)tables-nft
(iptables-over-nftables api).

In the future the _LEGACY symbol will become visible and the select
statements will be turned into 'depends on', but for now be on safe side
so "make oldconfig" won't break things.

Signed-off-by: Florian Westphal <fw@strlen.de>
---
 net/ipv4/netfilter/Kconfig  | 15 ++++++++++++---
 net/ipv4/netfilter/Makefile |  2 +-
 net/ipv6/netfilter/Kconfig  | 20 ++++++++++++++------
 net/ipv6/netfilter/Makefile |  2 +-
 net/netfilter/Kconfig       | 12 ++++++------
 5 files changed, 34 insertions(+), 17 deletions(-)
diff mbox series

Patch

diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 070475392236..783523087281 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -10,6 +10,10 @@  config NF_DEFRAG_IPV4
 	tristate
 	default n
 
+# old sockopt interface and eval loop
+config IP_NF_IPTABLES_LEGACY
+	tristate
+
 config NF_SOCKET_IPV4
 	tristate "IPv4 socket lookup support"
 	help
@@ -152,7 +156,7 @@  config IP_NF_MATCH_ECN
 config IP_NF_MATCH_RPFILTER
 	tristate '"rpfilter" reverse path filter match support'
 	depends on NETFILTER_ADVANCED
-	depends on IP_NF_MANGLE || IP_NF_RAW
+	depends on IP_NF_MANGLE || IP_NF_RAW || NFT_COMPAT
 	help
 	  This option allows you to match packets whose replies would
 	  go out via the interface the packet came in.
@@ -173,6 +177,7 @@  config IP_NF_MATCH_TTL
 config IP_NF_FILTER
 	tristate "Packet filtering"
 	default m if NETFILTER_ADVANCED=n
+	select IP_NF_IPTABLES_LEGACY
 	help
 	  Packet filtering defines a table `filter', which has a series of
 	  rules for simple packet filtering at local input, forwarding and
@@ -182,7 +187,7 @@  config IP_NF_FILTER
 
 config IP_NF_TARGET_REJECT
 	tristate "REJECT target support"
-	depends on IP_NF_FILTER
+	depends on IP_NF_FILTER || NFT_COMPAT
 	select NF_REJECT_IPV4
 	default m if NETFILTER_ADVANCED=n
 	help
@@ -212,6 +217,7 @@  config IP_NF_NAT
 	default m if NETFILTER_ADVANCED=n
 	select NF_NAT
 	select NETFILTER_XT_NAT
+	select IP6_NF_IPTABLES_LEGACY
 	help
 	  This enables the `nat' table in iptables. This allows masquerading,
 	  port forwarding and other forms of full Network Address Port
@@ -252,6 +258,7 @@  endif # IP_NF_NAT
 config IP_NF_MANGLE
 	tristate "Packet mangling"
 	default m if NETFILTER_ADVANCED=n
+	select IP_NF_IPTABLES_LEGACY
 	help
 	  This option adds a `mangle' table to iptables: see the man page for
 	  iptables(8).  This table is used for various packet alterations
@@ -261,7 +268,7 @@  config IP_NF_MANGLE
 
 config IP_NF_TARGET_ECN
 	tristate "ECN target support"
-	depends on IP_NF_MANGLE
+	depends on IP_NF_MANGLE || NFT_COMPAT
 	depends on NETFILTER_ADVANCED
 	help
 	  This option adds a `ECN' target, which can be used in the iptables mangle
@@ -286,6 +293,7 @@  config IP_NF_TARGET_TTL
 # raw + specific targets
 config IP_NF_RAW
 	tristate  'raw table support (required for NOTRACK/TRACE)'
+	select IP_NF_IPTABLES_LEGACY
 	help
 	  This option adds a `raw' table to iptables. This table is the very
 	  first in the netfilter framework and hooks in at the PREROUTING
@@ -299,6 +307,7 @@  config IP_NF_SECURITY
 	tristate "Security table"
 	depends on SECURITY
 	depends on NETFILTER_ADVANCED
+	select IP_NF_IPTABLES_LEGACY
 	help
 	  This option adds a `security' table to iptables, for use
 	  with Mandatory Access Control (MAC) policy.
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 5a26f9de1ab9..85502d4dfbb4 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -25,7 +25,7 @@  obj-$(CONFIG_NFT_FIB_IPV4) += nft_fib_ipv4.o
 obj-$(CONFIG_NFT_DUP_IPV4) += nft_dup_ipv4.o
 
 # generic IP tables
-obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
+obj-$(CONFIG_IP_NF_IPTABLES_LEGACY) += ip_tables.o
 
 # the three instances of ip_tables
 obj-$(CONFIG_IP_NF_FILTER) += iptable_filter.o
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 0ba62f4868f9..f3c8e2d918e1 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -6,6 +6,10 @@ 
 menu "IPv6: Netfilter Configuration"
 	depends on INET && IPV6 && NETFILTER
 
+# old sockopt interface and eval loop
+config IP6_NF_IPTABLES_LEGACY
+	tristate
+
 config NF_SOCKET_IPV6
 	tristate "IPv6 socket lookup support"
 	help
@@ -147,7 +151,7 @@  config IP6_NF_MATCH_MH
 config IP6_NF_MATCH_RPFILTER
 	tristate '"rpfilter" reverse path filter match support'
 	depends on NETFILTER_ADVANCED
-	depends on IP6_NF_MANGLE || IP6_NF_RAW
+	depends on IP6_NF_MANGLE || IP6_NF_RAW || NFT_COMPAT
 	help
 	  This option allows you to match packets whose replies would
 	  go out via the interface the packet came in.
@@ -186,6 +190,8 @@  config IP6_NF_TARGET_HL
 config IP6_NF_FILTER
 	tristate "Packet filtering"
 	default m if NETFILTER_ADVANCED=n
+	select IP6_NF_IPTABLES_LEGACY
+	tristate
 	help
 	  Packet filtering defines a table `filter', which has a series of
 	  rules for simple packet filtering at local input, forwarding and
@@ -195,7 +201,7 @@  config IP6_NF_FILTER
 
 config IP6_NF_TARGET_REJECT
 	tristate "REJECT target support"
-	depends on IP6_NF_FILTER
+	depends on IP6_NF_FILTER || NFT_COMPAT
 	select NF_REJECT_IPV6
 	default m if NETFILTER_ADVANCED=n
 	help
@@ -221,6 +227,7 @@  config IP6_NF_TARGET_SYNPROXY
 config IP6_NF_MANGLE
 	tristate "Packet mangling"
 	default m if NETFILTER_ADVANCED=n
+	select IP6_NF_IPTABLES_LEGACY
 	help
 	  This option adds a `mangle' table to iptables: see the man page for
 	  iptables(8).  This table is used for various packet alterations
@@ -230,6 +237,7 @@  config IP6_NF_MANGLE
 
 config IP6_NF_RAW
 	tristate  'raw table support (required for TRACE)'
+	select IP6_NF_IPTABLES_LEGACY
 	help
 	  This option adds a `raw' table to ip6tables. This table is the very
 	  first in the netfilter framework and hooks in at the PREROUTING
@@ -243,6 +251,7 @@  config IP6_NF_SECURITY
 	tristate "Security table"
 	depends on SECURITY
 	depends on NETFILTER_ADVANCED
+	select IP6_NF_IPTABLES_LEGACY
 	help
 	  This option adds a `security' table to iptables, for use
 	  with Mandatory Access Control (MAC) policy.
@@ -254,6 +263,7 @@  config IP6_NF_NAT
 	depends on NF_CONNTRACK
 	depends on NETFILTER_ADVANCED
 	select NF_NAT
+	select IP6_NF_IPTABLES_LEGACY
 	select NETFILTER_XT_NAT
 	help
 	  This enables the `nat' table in ip6tables. This allows masquerading,
@@ -262,25 +272,23 @@  config IP6_NF_NAT
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
-if IP6_NF_NAT
-
 config IP6_NF_TARGET_MASQUERADE
 	tristate "MASQUERADE target support"
 	select NETFILTER_XT_TARGET_MASQUERADE
+	depends on IP6_NF_NAT
 	help
 	  This is a backwards-compat option for the user's convenience
 	  (e.g. when running oldconfig). It selects NETFILTER_XT_TARGET_MASQUERADE.
 
 config IP6_NF_TARGET_NPT
 	tristate "NPT (Network Prefix translation) target support"
+	depends on IP6_NF_NAT || NFT_COMPAT
 	help
 	  This option adds the `SNPT' and `DNPT' target, which perform
 	  stateless IPv6-to-IPv6 Network Prefix Translation per RFC 6296.
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
-endif # IP6_NF_NAT
-
 endif # IP6_NF_IPTABLES
 endmenu
 
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index b8d6dc9aeeb6..66ce6fa5b2f5 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -4,7 +4,7 @@ 
 #
 
 # Link order matters here.
-obj-$(CONFIG_IP6_NF_IPTABLES) += ip6_tables.o
+obj-$(CONFIG_IP6_NF_IPTABLES_LEGACY) += ip6_tables.o
 obj-$(CONFIG_IP6_NF_FILTER) += ip6table_filter.o
 obj-$(CONFIG_IP6_NF_MANGLE) += ip6table_mangle.o
 obj-$(CONFIG_IP6_NF_RAW) += ip6table_raw.o
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 441d1f134110..df2dc21304ef 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -818,7 +818,7 @@  config NETFILTER_XT_TARGET_AUDIT
 
 config NETFILTER_XT_TARGET_CHECKSUM
 	tristate "CHECKSUM target support"
-	depends on IP_NF_MANGLE || IP6_NF_MANGLE
+	depends on IP_NF_MANGLE || IP6_NF_MANGLE || NFT_COMPAT
 	depends on NETFILTER_ADVANCED
 	help
 	  This option adds a `CHECKSUM' target, which can be used in the iptables mangle
@@ -869,7 +869,7 @@  config NETFILTER_XT_TARGET_CONNSECMARK
 config NETFILTER_XT_TARGET_CT
 	tristate '"CT" target support'
 	depends on NF_CONNTRACK
-	depends on IP_NF_RAW || IP6_NF_RAW
+	depends on IP_NF_RAW || IP6_NF_RAW || NFT_COMPAT
 	depends on NETFILTER_ADVANCED
 	help
 	  This options adds a `CT' target, which allows to specify initial
@@ -880,7 +880,7 @@  config NETFILTER_XT_TARGET_CT
 
 config NETFILTER_XT_TARGET_DSCP
 	tristate '"DSCP" and "TOS" target support'
-	depends on IP_NF_MANGLE || IP6_NF_MANGLE
+	depends on IP_NF_MANGLE || IP6_NF_MANGLE || NFT_COMPAT
 	depends on NETFILTER_ADVANCED
 	help
 	  This option adds a `DSCP' target, which allows you to manipulate
@@ -896,7 +896,7 @@  config NETFILTER_XT_TARGET_DSCP
 
 config NETFILTER_XT_TARGET_HL
 	tristate '"HL" hoplimit target support'
-	depends on IP_NF_MANGLE || IP6_NF_MANGLE
+	depends on IP_NF_MANGLE || IP6_NF_MANGLE || NFT_COMPAT
 	depends on NETFILTER_ADVANCED
 	help
 	This option adds the "HL" (for IPv6) and "TTL" (for IPv4)
@@ -1080,7 +1080,7 @@  config NETFILTER_XT_TARGET_TPROXY
 	depends on NETFILTER_ADVANCED
 	depends on IPV6 || IPV6=n
 	depends on IP6_NF_IPTABLES || IP6_NF_IPTABLES=n
-	depends on IP_NF_MANGLE
+	depends on IP_NF_MANGLE || NFT_COMPAT
 	select NF_DEFRAG_IPV4
 	select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES != n
 	select NF_TPROXY_IPV4
@@ -1147,7 +1147,7 @@  config NETFILTER_XT_TARGET_TCPMSS
 
 config NETFILTER_XT_TARGET_TCPOPTSTRIP
 	tristate '"TCPOPTSTRIP" target support'
-	depends on IP_NF_MANGLE || IP6_NF_MANGLE
+	depends on IP_NF_MANGLE || IP6_NF_MANGLE || NFT_COMPAT
 	depends on NETFILTER_ADVANCED
 	help
 	  This option adds a "TCPOPTSTRIP" target, which allows you to strip