Phonet: hook resource routing to userspace via ioctl()'s

I wish we could use something cleaner, such as bind(). But that would
not work since resource subscription is orthogonal/in addition to the
normal object ID allocated via bind(). This is similar to multicasting
which also uses ioctl()'s.
Signed-off-by: NRémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/linux/phonet.h

@@ -47,6 +47,8 @@
 
 /* ioctls */
 #define SIOCPNGETOBJECT		(SIOCPROTOPRIVATE + 0)
+#define SIOCPNADDRESOURCE	(SIOCPROTOPRIVATE + 14)
+#define SIOCPNDELRESOURCE	(SIOCPROTOPRIVATE + 15)
 
 /* Phonet protocol header */
 struct phonethdr {

net/phonet/datagram.c

@@ -52,6 +52,19 @@ static int pn_ioctl(struct sock *sk, int cmd, unsigned long arg)
 		answ = skb ? skb->len : 0;
 		release_sock(sk);
 		return put_user(answ, (int __user *)arg);
+
+	case SIOCPNADDRESOURCE:
+	case SIOCPNDELRESOURCE: {
+			u32 res;
+			if (get_user(res, (u32 __user *)arg))
+				return -EFAULT;
+			if (res >= 256)
+				return -EINVAL;
+			if (cmd == SIOCPNADDRESOURCE)
+				return pn_sock_bind_res(sk, res);
+			else
+				return pn_sock_unbind_res(sk, res);
+		}
 	}
 
 	return -ENOIOCTLCMD;

net/phonet/socket.c

@@ -158,6 +158,7 @@ void pn_sock_unhash(struct sock *sk)
 	spin_lock_bh(&pnsocks.lock);
 	sk_del_node_init(sk);
 	spin_unlock_bh(&pnsocks.lock);
+	pn_sock_unbind_all_res(sk);
 }
 EXPORT_SYMBOL(pn_sock_unhash);