netfilter: xt_TPROXY: undefined reference to `udp6_lib_lookup'

CONFIG_IPV6=m
CONFIG_NETFILTER_XT_TARGET_TPROXY=y

   net/built-in.o: In function `nf_tproxy_get_sock_v6.constprop.11':
>> xt_TPROXY.c:(.text+0x583a1): undefined reference to `udp6_lib_lookup'
   net/built-in.o: In function `tproxy_tg_init':
>> xt_TPROXY.c:(.init.text+0x1dc3): undefined reference to `nf_defrag_ipv6_enable'

This fix is similar to 1a5bbfc ("netfilter: Fix build errors with
xt_socket.c").

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 4bef6eb7c40d..831f9603c0ed 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -839,6 +839,7 @@ config NETFILTER_XT_TARGET_TPROXY
         tristate '"TPROXY" target transparent proxying support'
         depends on NETFILTER_XTABLES
         depends on NETFILTER_ADVANCED
+        depends on (IPV6 || IPV6=n)
         depends on IP_NF_MANGLE
         select NF_DEFRAG_IPV4
         select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES