net: use core MTU range checking in wireless drivers

- set max_mtu in wil6210 driver
- set max_mtu in atmel driver
- set min/max_mtu in cisco airo driver, remove airo_change_mtu
- set min/max_mtu in ipw2100/ipw2200 drivers, remove libipw_change_mtu
- set min/max_mtu in p80211netdev, remove wlan_change_mtu
- set min/max_mtu in net/mac80211/iface.c and remove ieee80211_change_mtu
- set min/max_mtu in wimax/i2400m and remove i2400m_change_mtu
- set min/max_mtu in intersil/hostap and remove prism2_change_mtu
- set min/max_mtu in intersil/orinoco
- set min/max_mtu in tty/n_gsm and remove gsm_change_mtu

CC: [e-mail]
CC: [e-mail]
CC: Maya Erez <[e-mail]>
CC: Simon Kelley <[e-mail]>
CC: Stanislav Yakovlev <[e-mail]>
CC: Johannes Berg <[e-mail]>
CC: Inaky Perez-Gonzalez <[e-mail]>
Signed-off-by: Jarod Wilson <[e-mail]>
Acked-by: Johannes Berg <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/wimax/i2400m/netdev.c

···
 
 
 static
-int i2400m_change_mtu(struct net_device *net_dev, int new_mtu)
-{
-	int result;
-	struct i2400m *i2400m = net_dev_to_i2400m(net_dev);
-	struct device *dev = i2400m_dev(i2400m);
-
-	if (new_mtu >= I2400M_MAX_MTU) {
-		dev_err(dev, "Cannot change MTU to %d (max is %d)\n",
-			new_mtu, I2400M_MAX_MTU);
-		result = -EINVAL;
-	} else {
-		net_dev->mtu = new_mtu;
-		result = 0;
-	}
-	return result;
-}
-
-
-static
 void i2400m_tx_timeout(struct net_device *net_dev)
 {
 	/*
···
 	.ndo_stop = i2400m_stop,
 	.ndo_start_xmit = i2400m_hard_start_xmit,
 	.ndo_tx_timeout = i2400m_tx_timeout,
-	.ndo_change_mtu = i2400m_change_mtu,
 };
 
 static void i2400m_get_drvinfo(struct net_device *net_dev,
···
 	d_fnstart(3, NULL, "(net_dev %p)\n", net_dev);
 	ether_setup(net_dev);
 	net_dev->mtu = I2400M_MAX_MTU;
+	net_dev->min_mtu = 0;
+	net_dev->max_mtu = I2400M_MAX_MTU;
 	net_dev->tx_queue_len = I2400M_TX_QLEN;
 	net_dev->features =
 		  NETIF_F_VLAN_CHALLENGED

drivers/net/wireless/ath/wil6210/netdev.c

···
 	return wil_down(wil);
 }
 
-static int wil_change_mtu(struct net_device *ndev, int new_mtu)
-{
-	struct wil6210_priv *wil = ndev_to_wil(ndev);
-
-	if (new_mtu < 68 || new_mtu > mtu_max) {
-		wil_err(wil, "invalid MTU %d\n", new_mtu);
-		return -EINVAL;
-	}
-
-	wil_dbg_misc(wil, "change MTU %d -> %d\n", ndev->mtu, new_mtu);
-	ndev->mtu = new_mtu;
-
-	return 0;
-}
-
 static int wil_do_ioctl(struct net_device *ndev, struct ifreq *ifr, int cmd)
 {
 	struct wil6210_priv *wil = ndev_to_wil(ndev);
···
 	.ndo_start_xmit		= wil_start_xmit,
 	.ndo_set_mac_address	= eth_mac_addr,
 	.ndo_validate_addr	= eth_validate_addr,
-	.ndo_change_mtu		= wil_change_mtu,
 	.ndo_do_ioctl		= wil_do_ioctl,
 };
 
···
 static void wil_dev_setup(struct net_device *dev)
 {
 	ether_setup(dev);
+	dev->max_mtu = mtu_max;
 	dev->tx_queue_len = WIL_TX_Q_LEN_DEFAULT;
 }
 

drivers/net/wireless/atmel/atmel.c

···
 	return &priv->wstats;
 }
 
-static int atmel_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if ((new_mtu < 68) || (new_mtu > 2312))
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 static int atmel_set_mac_address(struct net_device *dev, void *p)
 {
 	struct sockaddr *addr = p;
···
 static const struct net_device_ops atmel_netdev_ops = {
 	.ndo_open 		= atmel_open,
 	.ndo_stop		= atmel_close,
-	.ndo_change_mtu 	= atmel_change_mtu,
 	.ndo_set_mac_address 	= atmel_set_mac_address,
 	.ndo_start_xmit 	= start_tx,
 	.ndo_do_ioctl 		= atmel_ioctl,
···
 	dev->wireless_handlers = &atmel_handler_def;
 	dev->irq = irq;
 	dev->base_addr = port;
+
+	/* MTU range: 68 - 2312 */
+	dev->min_mtu = 68;
+	dev->max_mtu = MAX_WIRELESS_BODY - ETH_FCS_LEN;
 
 	SET_NETDEV_DEV(dev, sys_dev);
 

drivers/net/wireless/cisco/airo.c

···
 	return 0;
 }
 
-static int airo_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if ((new_mtu < 68) || (new_mtu > 2400))
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 static LIST_HEAD(airo_devices);
 
 static void add_airo_dev(struct airo_info *ai)
···
 	.ndo_get_stats 		= airo_get_stats,
 	.ndo_set_mac_address	= airo_set_mac_address,
 	.ndo_do_ioctl		= airo_ioctl,
-	.ndo_change_mtu		= airo_change_mtu,
 };
 
 static void wifi_setup(struct net_device *dev)
···
 	dev->type               = ARPHRD_IEEE80211;
 	dev->hard_header_len    = ETH_HLEN;
 	dev->mtu                = AIRO_DEF_MTU;
+	dev->min_mtu            = 68;
+	dev->max_mtu            = MIC_MSGLEN_MAX;
 	dev->addr_len           = ETH_ALEN;
 	dev->tx_queue_len       = 100; 
 
···
 	.ndo_set_rx_mode	= airo_set_multicast_list,
 	.ndo_set_mac_address	= airo_set_mac_address,
 	.ndo_do_ioctl		= airo_ioctl,
-	.ndo_change_mtu		= airo_change_mtu,
 	.ndo_validate_addr	= eth_validate_addr,
 };
 
···
 	.ndo_set_rx_mode	= airo_set_multicast_list,
 	.ndo_set_mac_address	= airo_set_mac_address,
 	.ndo_do_ioctl		= airo_ioctl,
-	.ndo_change_mtu		= airo_change_mtu,
 	.ndo_validate_addr	= eth_validate_addr,
 };
 
···
 	dev->irq = irq;
 	dev->base_addr = port;
 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
+	dev->max_mtu = MIC_MSGLEN_MAX;
 
 	SET_NETDEV_DEV(dev, dmdev);
 

drivers/net/wireless/intel/ipw2x00/ipw2100.c

···
 	.ndo_open		= ipw2100_open,
 	.ndo_stop		= ipw2100_close,
 	.ndo_start_xmit		= libipw_xmit,
-	.ndo_change_mtu		= libipw_change_mtu,
 	.ndo_tx_timeout		= ipw2100_tx_timeout,
 	.ndo_set_mac_address	= ipw2100_set_address,
 	.ndo_validate_addr	= eth_validate_addr,
···
 	dev->wireless_data = &priv->wireless_data;
 	dev->watchdog_timeo = 3 * HZ;
 	dev->irq = 0;
+	dev->min_mtu = 68;
+	dev->max_mtu = LIBIPW_DATA_LEN;
 
 	/* NOTE: We don't use the wireless_handlers hook
 	 * in dev as the system will start throwing WX requests

drivers/net/wireless/intel/ipw2x00/ipw2200.c

···
 	.ndo_open 		= ipw_prom_open,
 	.ndo_stop		= ipw_prom_stop,
 	.ndo_start_xmit		= ipw_prom_hard_start_xmit,
-	.ndo_change_mtu		= libipw_change_mtu,
 	.ndo_set_mac_address 	= eth_mac_addr,
 	.ndo_validate_addr	= eth_validate_addr,
 };
···
 
 	priv->prom_net_dev->type = ARPHRD_IEEE80211_RADIOTAP;
 	priv->prom_net_dev->netdev_ops = &ipw_prom_netdev_ops;
+
+	priv->prom_net_dev->min_mtu = 68;
+	priv->prom_net_dev->max_mtu = LIBIPW_DATA_LEN;
 
 	priv->prom_priv->ieee->iw_mode = IW_MODE_MONITOR;
 	SET_NETDEV_DEV(priv->prom_net_dev, &priv->pci_dev->dev);
···
 	.ndo_set_rx_mode	= ipw_net_set_multicast_list,
 	.ndo_set_mac_address	= ipw_net_set_mac_address,
 	.ndo_start_xmit		= libipw_xmit,
-	.ndo_change_mtu		= libipw_change_mtu,
 	.ndo_validate_addr	= eth_validate_addr,
 };
 
···
 	net_dev->wireless_data = &priv->wireless_data;
 	net_dev->wireless_handlers = &ipw_wx_handler_def;
 	net_dev->ethtool_ops = &ipw_ethtool_ops;
+
+	net_dev->min_mtu = 68;
+	net_dev->max_mtu = LIBIPW_DATA_LEN;
 
 	err = sysfs_create_group(&pdev->dev.kobj, &ipw_attribute_group);
 	if (err) {

drivers/net/wireless/intel/ipw2x00/libipw.h

···
 /* libipw.c */
 void free_libipw(struct net_device *dev, int monitor);
 struct net_device *alloc_libipw(int sizeof_priv, int monitor);
-int libipw_change_mtu(struct net_device *dev, int new_mtu);
 
 void libipw_networks_age(struct libipw_device *ieee, unsigned long age_secs);
 

drivers/net/wireless/intel/ipw2x00/libipw_module.c

···
 			      &ieee->network_free_list);
 }
 
-int libipw_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if ((new_mtu < 68) || (new_mtu > LIBIPW_DATA_LEN))
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
-}
-EXPORT_SYMBOL(libipw_change_mtu);
-
 struct net_device *alloc_libipw(int sizeof_priv, int monitor)
 {
 	struct libipw_device *ieee;

drivers/net/wireless/intersil/hostap/hostap_main.c

···
 }
 
 
-static int prism2_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if (new_mtu < PRISM2_MIN_MTU || new_mtu > PRISM2_MAX_MTU)
-		return -EINVAL;
-
-	dev->mtu = new_mtu;
-	return 0;
-}
-
-
 static void prism2_tx_timeout(struct net_device *dev)
 {
 	struct hostap_interface *iface;
···
 	.ndo_do_ioctl		= hostap_ioctl,
 	.ndo_set_mac_address	= prism2_set_mac_address,
 	.ndo_set_rx_mode	= hostap_set_multicast_list,
-	.ndo_change_mtu 	= prism2_change_mtu,
 	.ndo_tx_timeout 	= prism2_tx_timeout,
 	.ndo_validate_addr	= eth_validate_addr,
 };
···
 	.ndo_do_ioctl		= hostap_ioctl,
 	.ndo_set_mac_address	= prism2_set_mac_address,
 	.ndo_set_rx_mode	= hostap_set_multicast_list,
-	.ndo_change_mtu 	= prism2_change_mtu,
 	.ndo_tx_timeout 	= prism2_tx_timeout,
 	.ndo_validate_addr	= eth_validate_addr,
 };
···
 	.ndo_do_ioctl		= hostap_ioctl,
 	.ndo_set_mac_address	= prism2_set_mac_address,
 	.ndo_set_rx_mode	= hostap_set_multicast_list,
-	.ndo_change_mtu 	= prism2_change_mtu,
 	.ndo_tx_timeout 	= prism2_tx_timeout,
 	.ndo_validate_addr	= eth_validate_addr,
 };
···
 
 	iface = netdev_priv(dev);
 	ether_setup(dev);
+	dev->min_mtu = PRISM2_MIN_MTU;
+	dev->max_mtu = PRISM2_MAX_MTU;
 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 
 	/* kernel callbacks */

drivers/net/wireless/intersil/orinoco/main.c

···
 {
 	struct orinoco_private *priv = ndev_priv(dev);
 
-	if ((new_mtu < ORINOCO_MIN_MTU) || (new_mtu > ORINOCO_MAX_MTU))
-		return -EINVAL;
-
 	/* MTU + encapsulation + header length */
 	if ((new_mtu + ENCAPS_OVERHEAD + sizeof(struct ieee80211_hdr)) >
 	     (priv->nicbuf_size - ETH_HLEN))
···
 
 	dev->base_addr = base_addr;
 	dev->irq = irq;
+
+	dev->min_mtu = ORINOCO_MIN_MTU;
+	dev->max_mtu = ORINOCO_MAX_MTU;
 
 	SET_NETDEV_DEV(dev, priv->dev);
 	ret = register_netdev(dev);

drivers/staging/wlan-ng/p80211netdev.c

···
 	return result;
 }
 
-static int wlan_change_mtu(struct net_device *dev, int new_mtu)
-{
-	/* 2312 is max 802.11 payload, 20 is overhead, (ether + llc +snap)
-	   and another 8 for wep. */
-	if ((new_mtu < 68) || (new_mtu > (2312 - 20 - 8)))
-		return -EINVAL;
-
-	dev->mtu = new_mtu;
-
-	return 0;
-}
-
 static const struct net_device_ops p80211_netdev_ops = {
 	.ndo_init = p80211knetdev_init,
 	.ndo_open = p80211knetdev_open,
···
 	.ndo_do_ioctl = p80211knetdev_do_ioctl,
 	.ndo_set_mac_address = p80211knetdev_set_mac_address,
 	.ndo_tx_timeout = p80211knetdev_tx_timeout,
-	.ndo_change_mtu = wlan_change_mtu,
 	.ndo_validate_addr = eth_validate_addr,
 };
 
···
 		wdev->wiphy = wiphy;
 		wdev->iftype = NL80211_IFTYPE_STATION;
 		netdev->ieee80211_ptr = wdev;
+		netdev->min_mtu = 68;
+		/* 2312 is max 802.11 payload, 20 is overhead,
+		 * (ether + llc + snap) and another 8 for wep.
+		 */
+		netdev->max_mtu = (2312 - 20 - 8);
 
 		netif_stop_queue(netdev);
 		netif_carrier_off(netdev);

drivers/tty/n_gsm.c

···
 	return;
 }
 
-static int gsm_change_mtu(struct net_device *net, int new_mtu)
-{
-	struct gsm_mux_net *mux_net = netdev_priv(net);
-	if ((new_mtu < 8) || (new_mtu > mux_net->dlci->gsm->mtu))
-		return -EINVAL;
-	net->mtu = new_mtu;
-	return 0;
-}
-
 static void gsm_mux_net_init(struct net_device *net)
 {
 	static const struct net_device_ops gsm_netdev_ops = {
···
 		.ndo_start_xmit		= gsm_mux_net_start_xmit,
 		.ndo_tx_timeout		= gsm_mux_net_tx_timeout,
 		.ndo_get_stats		= gsm_mux_net_get_stats,
-		.ndo_change_mtu		= gsm_change_mtu,
 	};
 
 	net->netdev_ops = &gsm_netdev_ops;
···
 		return -ENOMEM;
 	}
 	net->mtu = dlci->gsm->mtu;
+	net->min_mtu = 8;
+	net->max_mtu = dlci->gsm->mtu;
 	mux_net = netdev_priv(net);
 	mux_net->dlci = dlci;
 	kref_init(&mux_net->ref);

net/mac80211/iface.c

···
 		ieee80211_hw_config(local, change);
 }
 
-static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
-		return -EINVAL;
-
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 				bool check_dup)
 {
···
 	.ndo_uninit		= ieee80211_uninit,
 	.ndo_start_xmit		= ieee80211_subif_start_xmit,
 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
-	.ndo_change_mtu 	= ieee80211_change_mtu,
 	.ndo_set_mac_address 	= ieee80211_change_mac,
 	.ndo_select_queue	= ieee80211_netdev_select_queue,
 	.ndo_get_stats64	= ieee80211_get_stats64,
···
 	.ndo_uninit		= ieee80211_uninit,
 	.ndo_start_xmit		= ieee80211_monitor_start_xmit,
 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
-	.ndo_change_mtu 	= ieee80211_change_mtu,
 	.ndo_set_mac_address 	= ieee80211_change_mac,
 	.ndo_select_queue	= ieee80211_monitor_select_queue,
 	.ndo_get_stats64	= ieee80211_get_stats64,
···
 		ndev->features |= local->hw.netdev_features;
 
 		netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
+
+		/* MTU range: 256 - 2304 */
+		ndev->min_mtu = 256;
+		ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
 
 		ret = register_netdevice(ndev);
 		if (ret) {