Phonet: deliver broadcast packets to broadcast sockets

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/phonet/phonet.h

@@ -47,6 +47,7 @@ static inline struct pn_sock *pn_sk(struct sock *sk)
 extern const struct proto_ops phonet_dgram_ops;
 
 struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *sa);
+void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb);
 void phonet_get_local_port_range(int *min, int *max);
 void pn_sock_hash(struct sock *sk);
 void pn_sock_unhash(struct sock *sk);

net/phonet/af_phonet.c

@@ -369,6 +369,12 @@ static int phonet_rcv(struct sk_buff *skb, struct net_device *dev,
 
 	pn_skb_get_dst_sockaddr(skb, &sa);
 
+	/* check if this is broadcasted */
+	if (pn_sockaddr_get_addr(&sa) == PNADDR_BROADCAST) {
+		pn_deliver_sock_broadcast(net, skb);
+		goto out;
+	}
+
 	/* check if we are the destination */
 	if (phonet_address_lookup(net, pn_sockaddr_get_addr(&sa)) == 0) {
 		/* Phonet packet input */

net/phonet/socket.c

@@ -94,7 +94,28 @@ struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *spn)
 	spin_unlock_bh(&pnsocks.lock);
 
 	return rval;
+}
 
+/* Deliver a broadcast packet (only in bottom-half) */
+void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb)
+{
+	struct hlist_node *node;
+	struct sock *sknode;
+
+	spin_lock(&pnsocks.lock);
+	sk_for_each(sknode, node, &pnsocks.hlist) {
+		struct sk_buff *clone;
+
+		if (!net_eq(sock_net(sknode), net))
+			continue;
+		if (!sock_flag(sknode, SOCK_BROADCAST))
+			continue;
+
+		clone = skb_clone(skb, GFP_ATOMIC);
+		if (clone)
+			sk_receive_skb(sknode, clone, 0);
+	}
+	spin_unlock(&pnsocks.lock);
 }
 
 void pn_sock_hash(struct sock *sk)