[NET]: Add a dev_ioctl() fallback to sock_ioctl()

Currently all network protocols need to call dev_ioctl as the default
fallback in their ioctl implementations.  This patch adds a fallback
to dev_ioctl to sock_ioctl if the protocol returned -ENOIOCTLCMD.
This way all the procotol ioctl handlers can be simplified and we don't
need to export dev_ioctl.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

net/appletalk/ddp.c

@@ -1763,7 +1763,7 @@ static int atalk_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr
  */
 static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 {
-	int rc = -EINVAL;
+	int rc = -ENOIOCTLCMD;
 	struct sock *sk = sock->sk;
 	void __user *argp = (void __user *)arg;
 
@@ -1813,23 +1813,6 @@ static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 			rc = atif_ioctl(cmd, argp);
 			rtnl_unlock();
 			break;
-		/* Physical layer ioctl calls */
-		case SIOCSIFLINK:
-		case SIOCGIFHWADDR:
-		case SIOCSIFHWADDR:
-		case SIOCGIFFLAGS:
-		case SIOCSIFFLAGS:
-		case SIOCGIFTXQLEN:
-		case SIOCSIFTXQLEN:
-		case SIOCGIFMTU:
-		case SIOCGIFCONF:
-		case SIOCADDMULTI:
-		case SIOCDELMULTI:
-		case SIOCGIFCOUNT:
-		case SIOCGIFINDEX:
-		case SIOCGIFNAME:
-			rc = dev_ioctl(cmd, argp);
-			break;
 	}
 
 	return rc;

net/ax25/af_ax25.c

@@ -1827,7 +1827,7 @@ static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 		break;
 
 	default:
-		res = dev_ioctl(cmd, argp);
+		res = -ENOIOCTLCMD;
 		break;
 	}
 	release_sock(sk);

net/core/dev.c

@@ -3276,7 +3276,6 @@ EXPORT_SYMBOL(dev_close);
 EXPORT_SYMBOL(dev_get_by_flags);
 EXPORT_SYMBOL(dev_get_by_index);
 EXPORT_SYMBOL(dev_get_by_name);
-EXPORT_SYMBOL(dev_ioctl);
 EXPORT_SYMBOL(dev_open);
 EXPORT_SYMBOL(dev_queue_xmit);
 EXPORT_SYMBOL(dev_remove_pack);

net/decnet/af_decnet.c

@@ -1252,7 +1252,7 @@ static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 		break;
 
 	default:
-		err = dev_ioctl(cmd, (void __user *)arg);
+		err = -ENOIOCTLCMD;
 		break;
 	}
 

net/econet/af_econet.c

@@ -687,7 +687,7 @@ static int econet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg
 			break;
 
 		default:
-			return dev_ioctl(cmd, argp);
+			return -ENOIOCTLCMD;
 	}
 	/*NOTREACHED*/
 	return 0;

net/ipv4/af_inet.c

@@ -777,10 +777,10 @@ int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 			err = devinet_ioctl(cmd, (void __user *)arg);
 			break;
 		default:
-			if (!sk->sk_prot->ioctl ||
-			    (err = sk->sk_prot->ioctl(sk, cmd, arg)) ==
-			    					-ENOIOCTLCMD)
-				err = dev_ioctl(cmd, (void __user *)arg);
+			if (sk->sk_prot->ioctl)
+				err = sk->sk_prot->ioctl(sk, cmd, arg);
+			else
+				err = -ENOIOCTLCMD;
 			break;
 	}
 	return err;

net/ipv6/af_inet6.c

@@ -434,7 +434,6 @@ int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 {
 	struct sock *sk = sock->sk;
-	int err = -EINVAL;
 
 	switch(cmd) 
 	{
@@ -453,10 +452,9 @@ int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 	case SIOCSIFDSTADDR:
 		return addrconf_set_dstaddr((void __user *) arg);
 	default:
-		if (!sk->sk_prot->ioctl ||
-		    (err = sk->sk_prot->ioctl(sk, cmd, arg)) == -ENOIOCTLCMD)
-			return(dev_ioctl(cmd,(void __user *) arg));		
-		return err;
+		if (!sk->sk_prot->ioctl)
+			return -ENOIOCTLCMD;
+		return sk->sk_prot->ioctl(sk, cmd, arg);
 	}
 	/*NOTREACHED*/
 	return(0);

net/ipx/af_ipx.c

@@ -1884,7 +1884,7 @@ static int ipx_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 		rc = -EINVAL;
 		break;
 	default:
-		rc = dev_ioctl(cmd, argp);
+		rc = -ENOIOCTLCMD;
 		break;
 	}
 

net/irda/af_irda.c

@@ -1822,7 +1822,7 @@ static int irda_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 		return -EINVAL;
 	default:
 		IRDA_DEBUG(1, "%s(), doing device ioctl!\n", __FUNCTION__);
-		return dev_ioctl(cmd, (void __user *) arg);
+		return -ENOIOCTLCMD;
 	}
 
 	/*NOTREACHED*/

net/llc/af_llc.c

@@ -959,7 +959,7 @@ static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
 static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
 			unsigned long arg)
 {
-	return dev_ioctl(cmd, (void __user *)arg);
+	return -ENOIOCTLCMD;
 }
 
 /**

net/netrom/af_netrom.c

@@ -1215,7 +1215,7 @@ static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 		return nr_rt_ioctl(cmd, argp);
 
 	default:
-		return dev_ioctl(cmd, argp);
+		return -ENOIOCTLCMD;
 	}
 
 	return 0;

net/packet/af_packet.c

@@ -1521,7 +1521,7 @@ static int packet_ioctl(struct socket *sock, unsigned int cmd,
 #endif
 
 		default:
-			return dev_ioctl(cmd, (void __user *)arg);
+			return -ENOIOCTLCMD;
 	}
 	return 0;
 }

net/rose/af_rose.c

@@ -1320,7 +1320,7 @@ static int rose_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 		return 0;
 
 	default:
-		return dev_ioctl(cmd, argp);
+		return -ENOIOCTLCMD;
 	}
 
 	return 0;

net/socket.c

@@ -900,6 +900,13 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 			break;
 		default:
 			err = sock->ops->ioctl(sock, cmd, arg);
+
+			/*
+			 * If this ioctl is unknown try to hand it down
+			 * to the NIC driver.
+			 */
+			if (err == -ENOIOCTLCMD)
+				err = dev_ioctl(cmd, argp);
 			break;
 	}
 	return err;

net/unix/af_unix.c

@@ -1859,7 +1859,7 @@ static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 		}
 
 		default:
-			err = dev_ioctl(cmd, (void __user *)arg);
+			err = -ENOIOCTLCMD;
 			break;
 	}
 	return err;

net/wanrouter/af_wanpipe.c

@@ -1839,7 +1839,7 @@ static int wanpipe_ioctl(struct socket *sock, unsigned int cmd, unsigned long ar
 #endif
 
 		default:
-			return dev_ioctl(cmd,(void __user *) arg);
+			return -ENOIOCTLCMD;
 	}
 	/*NOTREACHED*/
 }

net/x25/af_x25.c

@@ -1378,7 +1378,7 @@ static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 		}
 
  		default:
-			rc = dev_ioctl(cmd, argp);
+			rc = -ENOIOCTLCMD;
 			break;
 	}