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net: netlink: add helper to retrieve NETLINK_F_STRICT_CHK

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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>
This commit is contained in:
Jakub Kicinski 2019-01-18 10:46:13 -08:00 committed by David S. Miller
parent 133bbb18ab
commit 59c28058fa
2 changed files with 9 additions and 0 deletions
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1
include/linux/netlink.h
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@ -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,

8
net/netlink/af_netlink.c
View File

@ -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);