Phonet: implement per-socket destination/peer address

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

@@ -36,6 +36,7 @@
 struct pn_sock {
 	struct sock	sk;
 	u16		sobject;
+	u16		dobject;
 	u8		resource;
 };
 

net/phonet/af_phonet.c

@@ -110,6 +110,7 @@ static int pn_socket_create(struct net *net, struct socket *sock, int protocol,
 	sk->sk_protocol = protocol;
 	pn = pn_sk(sk);
 	pn->sobject = 0;
+	pn->dobject = 0;
 	pn->resource = 0;
 	sk->sk_prot->init(sk);
 	err = 0;
@@ -242,8 +243,18 @@ int pn_skb_send(struct sock *sk, struct sk_buff *skb,
 	struct net_device *dev;
 	struct pn_sock *pn = pn_sk(sk);
 	int err;
-	u16 src;
-	u8 daddr = pn_sockaddr_get_addr(target), saddr = PN_NO_ADDR;
+	u16 src, dst;
+	u8 daddr, saddr, res;
+
+	src = pn->sobject;
+	if (target != NULL) {
+		dst = pn_sockaddr_get_object(target);
+		res = pn_sockaddr_get_resource(target);
+	} else {
+		dst = pn->dobject;
+		res = pn->resource;
+	}
+	daddr = pn_addr(dst);
 
 	err = -EHOSTUNREACH;
 	if (sk->sk_bound_dev_if)
@@ -271,12 +282,10 @@ int pn_skb_send(struct sock *sk, struct sk_buff *skb,
 	if (saddr == PN_NO_ADDR)
 		goto drop;
 
-	src = pn->sobject;
 	if (!pn_addr(src))
 		src = pn_object(saddr, pn_obj(src));
 
-	err = pn_send(skb, dev, pn_sockaddr_get_object(target),
-			src, pn_sockaddr_get_resource(target), 0);
+	err = pn_send(skb, dev, dst, src, res, 0);
 	dev_put(dev);
 	return err;
 

net/phonet/socket.c

@@ -633,8 +633,8 @@ static int pn_sock_seq_show(struct seq_file *seq, void *v)
 
 		seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu "
 			"%d %p %d%n",
-			sk->sk_protocol, pn->sobject, 0, pn->resource,
-			sk->sk_state,
+			sk->sk_protocol, pn->sobject, pn->dobject,
+			pn->resource, sk->sk_state,
 			sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk),
 			sock_i_uid(sk), sock_i_ino(sk),
 			atomic_read(&sk->sk_refcnt), sk,