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 <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 4e8add2..593d1b9 100644 (file)
--- 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 3c023d6..8fa35df 100644 (file)
--- 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)
 }
 EXPORT_SYMBOL_GPL(netlink_has_listeners);
 
+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;
+}
+EXPORT_SYMBOL_GPL(netlink_strict_get_check);
+
 static int netlink_broadcast_deliver(struct sock *sk, struct sk_buff *skb)
 {
        struct netlink_sock *nlk = nlk_sk(sk);