netlink: remove netlink_broadcast_filtered

No users in tree since commit a3498436b3a0 ("netns: restrict uevents"),
so remove this functionality.

Cc: Christian Brauner <[e-mail]>
Signed-off-by: Florian Westphal <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/linux/netlink.h

···
 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,
 		      __u32 group, gfp_t allocation);
-int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb,
-			       __u32 portid, __u32 group, gfp_t allocation,
-			       int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data),
-			       void *filter_data);
 int netlink_set_err(struct sock *ssk, __u32 portid, __u32 group, int code);
 int netlink_register_notifier(struct notifier_block *nb);
 int netlink_unregister_notifier(struct notifier_block *nb);

net/netlink/af_netlink.c

···
 	int delivered;
 	gfp_t allocation;
 	struct sk_buff *skb, *skb2;
-	int (*tx_filter)(struct sock *dsk, struct sk_buff *skb, void *data);
-	void *tx_data;
 };
 
 static void do_one_broadcast(struct sock *sk,
···
 			p->delivery_failure = 1;
 		goto out;
 	}
-	if (p->tx_filter && p->tx_filter(sk, p->skb2, p->tx_data)) {
-		kfree_skb(p->skb2);
-		p->skb2 = NULL;
-		goto out;
-	}
 	if (sk_filter(sk, p->skb2)) {
 		kfree_skb(p->skb2);
 		p->skb2 = NULL;
···
 	sock_put(sk);
 }
 
-int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, u32 portid,
-	u32 group, gfp_t allocation,
-	int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data),
-	void *filter_data)
+int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, u32 portid,
+		      u32 group, gfp_t allocation)
 {
 	struct net *net = sock_net(ssk);
 	struct netlink_broadcast_data info;
···
 	info.allocation = allocation;
 	info.skb = skb;
 	info.skb2 = NULL;
-	info.tx_filter = filter;
-	info.tx_data = filter_data;
 
 	/* While we sleep in clone, do not allow to change socket list */
 
···
 		return 0;
 	}
 	return -ESRCH;
-}
-EXPORT_SYMBOL(netlink_broadcast_filtered);
-
-int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, u32 portid,
-		      u32 group, gfp_t allocation)
-{
-	return netlink_broadcast_filtered(ssk, skb, portid, group, allocation,
-		NULL, NULL);
 }
 EXPORT_SYMBOL(netlink_broadcast);