netfilter: {ipt,ebt}_ULOG: rise warning on deprecation

This target has been superseded by NFLOG. Spot a warning
so we prepare removal in a couple of years.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Gao feng <gaofeng@cn.fujitsu.com>

4 files changed, 19 insertions, 1 deletions

diff --git a/include/net/netns/x_tables.h b/include/net/netns/x_tables.h
index c24060ee411e..02fe40f8c8fd 100644
--- a/include/net/netns/x_tables.h
+++ b/include/net/netns/x_tables.h
@@ -15,5 +15,11 @@ struct netns_xt {
         struct ebt_table *frame_filter;
         struct ebt_table *frame_nat;
 #endif
+#if IS_ENABLED(CONFIG_IP_NF_TARGET_ULOG)
+        bool ulog_warn_deprecated;
+#endif
+#if IS_ENABLED(CONFIG_BRIDGE_EBT_ULOG)
+        bool ebt_ulog_warn_deprecated;
+#endif
 };
 #endif
diff --git a/net/bridge/netfilter/ebt_ulog.c b/net/bridge/netfilter/ebt_ulog.c
index fc1905c51417..2ec6c19ff903 100644
--- a/net/bridge/netfilter/ebt_ulog.c
+++ b/net/bridge/netfilter/ebt_ulog.c
@@ -267,6 +267,12 @@ static int ebt_ulog_tg_check(const struct xt_tgchk_param *par)
 {
         struct ebt_ulog_info *uloginfo = par->targinfo;
 
+        if (!par->net->xt.ebt_ulog_warn_deprecated) {
+                pr_info("ebt_ulog is deprecated and it will be removed soon, "
+                        "use ebt_nflog instead\n");
+                par->net->xt.ebt_ulog_warn_deprecated = true;
+        }
+
         if (uloginfo->nlgroup > 31)
                 return -EINVAL;
 
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index e7916c193932..4e9028017428 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -111,7 +111,7 @@ config IP_NF_TARGET_REJECT
           To compile it as a module, choose M here.  If unsure, say N.
 
 config IP_NF_TARGET_ULOG
-        tristate "ULOG target support"
+        tristate "ULOG target support (obsolete)"
         default m if NETFILTER_ADVANCED=n
         ---help---
 
diff --git a/net/ipv4/netfilter/ipt_ULOG.c b/net/ipv4/netfilter/ipt_ULOG.c
index f8a222cb6448..c1953d07e2f4 100644
--- a/net/ipv4/netfilter/ipt_ULOG.c
+++ b/net/ipv4/netfilter/ipt_ULOG.c
@@ -325,6 +325,12 @@ static int ulog_tg_check(const struct xt_tgchk_param *par)
 {
         const struct ipt_ulog_info *loginfo = par->targinfo;
 
+        if (!par->net->xt.ulog_warn_deprecated) {
+                pr_info("ULOG is deprecated and it will be removed soon, "
+                        "use NFLOG instead\n");
+                par->net->xt.ulog_warn_deprecated = true;
+        }
+
         if (loginfo->prefix[sizeof(loginfo->prefix) - 1] != '\0') {
                 pr_debug("prefix not null-terminated\n");
                 return -EINVAL;