From ad62744cab5be7751fb56d2476b8427fc9938fe2 Mon Sep 17 00:00:00 2001
From: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Date: Mon, 11 Sep 2017 20:30:21 +0200
Subject: Backport patch netlink: extended ACK reporting

---
 configure.ac                                            | 10 ++++++++++
 kernel/include/linux/netfilter/ipset/ip_set_compat.h.in |  7 +++++++
 kernel/net/netfilter/ipset/ip_set_core.c                |  2 +-
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 6482670..2c6354f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -549,6 +549,16 @@ else
 	AC_SUBST(HAVE_NFNL_MSG_TYPE, undef)
 fi
 
+AC_MSG_CHECKING([kernel source for netlink extended ACK])
+if test -f $ksourcedir/include/linux/netlink.h && \
+   $AWK '/^extern void netlink_ack/ {for(i=1; i<=2; i++) {getline; print}}' $ksourcedir/include/linux/netlink.h | $GREP -q 'const struct netlink_ext_ack'; then
+	AC_MSG_RESULT(yes)
+	AC_SUBST(HAVE_NETLINK_EXTENDED_ACK, define)
+else
+	AC_MSG_RESULT(no)
+	AC_SUBST(HAVE_NETLINK_EXTENDED_ACK, undef)
+fi
+
 AC_MSG_CHECKING([kernel source for struct net_generic])
 if test -f $ksourcedir/include/net/netns/generic.h && \
    $GREP -q 'struct net_generic' $ksourcedir/include/net/netns/generic.h; then
diff --git a/kernel/include/linux/netfilter/ipset/ip_set_compat.h.in b/kernel/include/linux/netfilter/ipset/ip_set_compat.h.in
index 002e3db..fd1696b 100644
--- a/kernel/include/linux/netfilter/ipset/ip_set_compat.h.in
+++ b/kernel/include/linux/netfilter/ipset/ip_set_compat.h.in
@@ -39,6 +39,7 @@
 #@HAVE_XT_FAMILY@ HAVE_XT_FAMILY
 #@HAVE_XT_NET@ HAVE_XT_NET
 #@HAVE_NFNL_MSG_TYPE@ HAVE_NFNL_MSG_TYPE
+#@HAVE_NETLINK_EXTENDED_ACK@ HAVE_NETLINK_EXTENDED_ACK
 
 #ifdef HAVE_EXPORT_SYMBOL_GPL_IN_MODULE_H
 #include <linux/module.h>
@@ -304,6 +305,12 @@ static inline u16 nfnl_msg_type(u8 subsys, u8 msg_type)
 }
 #endif
 
+#ifdef HAVE_NETLINK_EXTENDED_ACK
+#define NETLINK_ACK(in_skb, nlh, err, extack)	netlink_ack(in_skb, nlh, err, extack)
+#else
+#define NETLINK_ACK(in_skb, nlh, err, extack)	netlink_ack(in_skb, nlh, err)
+#endif
+
 #ifdef HAVE_STATE_IN_XT_ACTION_PARAM
 #define XAP_STATE(par)		(par->state)
 #else
diff --git a/kernel/net/netfilter/ipset/ip_set_core.c b/kernel/net/netfilter/ipset/ip_set_core.c
index fbb8df1..d7ef329 100644
--- a/kernel/net/netfilter/ipset/ip_set_core.c
+++ b/kernel/net/netfilter/ipset/ip_set_core.c
@@ -1317,7 +1317,7 @@ ip_set_dump_start(struct sk_buff *skb, struct netlink_callback *cb)
 			 * manually :-(
 			 */
 			if (nlh->nlmsg_flags & NLM_F_ACK)
-				netlink_ack(cb->skb, nlh, ret);
+				NETLINK_ACK(cb->skb, nlh, ret, NULL);
 			return ret;
 		}
 	}
-- 
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