Phonet: check destination before delivering packets locally

Signed-off-by: Rémi Denis-Courmont <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

net/phonet/af_phonet.c

@@ -275,8 +275,6 @@ static inline int can_respond(struct sk_buff *skb)
 		return 0;
 
 	ph = pn_hdr(skb);
-	if (phonet_address_get(skb->dev, ph->pn_rdev) != ph->pn_rdev)
-		return 0; /* we are not the destination */
 	if (ph->pn_res == PN_PREFIX && !pskb_may_pull(skb, 5))
 		return 0;
 	if (ph->pn_res == PN_COMMGR) /* indications */
@@ -344,8 +342,8 @@ static int phonet_rcv(struct sk_buff *skb, struct net_device *dev,
 			struct packet_type *pkttype,
 			struct net_device *orig_dev)
 {
+	struct net *net = dev_net(dev);
 	struct phonethdr *ph;
-	struct sock *sk;
 	struct sockaddr_pn sa;
 	u16 len;
 
@@ -364,21 +362,21 @@ static int phonet_rcv(struct sk_buff *skb, struct net_device *dev,
 	skb_reset_transport_header(skb);
 
 	pn_skb_get_dst_sockaddr(skb, &sa);
-	if (pn_sockaddr_get_addr(&sa) == 0)
-		goto out; /* currently, we cannot be device 0 */
 
-	sk = pn_find_sock_by_sa(dev_net(dev), &sa);
-	if (sk == NULL) {
+	/* check if we are the destination */
+	if (phonet_address_lookup(net, pn_sockaddr_get_addr(&sa)) == 0) {
+		/* Phonet packet input */
+		struct sock *sk = pn_find_sock_by_sa(net, &sa);
+
+		if (sk)
+			return sk_receive_skb(sk, skb, 0);
+
 		if (can_respond(skb)) {
 			send_obj_unreachable(skb);
 			send_reset_indications(skb);
 		}
-		goto out;
 	}
 
-	/* Push data to the socket (or other sockets connected to it). */
-	return sk_receive_skb(sk, skb, 0);
-
 out:
 	kfree_skb(skb);
 	return NET_RX_DROP;