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Date:   Thu, 17 Jan 2019 14:52:48 -0800
From:   Jakub Kicinski <>
        Jakub Kicinski <>
Subject: [PATCH net-next 01/13] net: netlink: add helper to retrieve NETLINK_F_STRICT_CHK

Dumps can read state of the NETLINK_F_STRICT_CHK flag from
a field in the callback structure.  For non-dump GET requests
we need a way to access the state of that flag from a socket.

Signed-off-by: Jakub Kicinski <>
 include/linux/netlink.h  | 1 +
 net/netlink/af_netlink.c | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 4e8add270200..593d1b9c33a8 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -126,6 +126,7 @@ void __netlink_clear_multicast_users(struct sock *sk, unsigned int group);
 void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err,
 		 const struct netlink_ext_ack *extack);
 int netlink_has_listeners(struct sock *sk, unsigned int group);
+bool netlink_strict_get_check(struct sk_buff *skb);
 int netlink_unicast(struct sock *ssk, struct sk_buff *skb, __u32 portid, int nonblock);
 int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, __u32 portid,
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 3c023d6120f6..8fa35df94c07 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1371,6 +1371,14 @@ int netlink_has_listeners(struct sock *sk, unsigned int group)
+bool netlink_strict_get_check(struct sk_buff *skb)
+	const struct netlink_sock *nlk = nlk_sk(NETLINK_CB(skb).sk);
+	return nlk->flags & NETLINK_F_STRICT_CHK;
 static int netlink_broadcast_deliver(struct sock *sk, struct sk_buff *skb)
 	struct netlink_sock *nlk = nlk_sk(sk);

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