[NET] NETNS: Omit net_device->nd_net without CONFIG_NET_NS.

Introduce per-net_device inlines: dev_net(), dev_net_set().
Without CONFIG_NET_NS, no namespace other than &init_net exists.
Let's explicitly define them to help compiler optimizations.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

arch/ia64/hp/sim/simeth.c

@@ -294,7 +294,7 @@ simeth_device_event(struct notifier_block *this,unsigned long event, void *ptr)
 		return NOTIFY_DONE;
 	}
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		return NOTIFY_DONE;
 
 	if ( event != NETDEV_UP && event != NETDEV_DOWN ) return NOTIFY_DONE;

drivers/block/aoe/aoenet.c

@@ -115,7 +115,7 @@ aoenet_rcv(struct sk_buff *skb, struct net_device *ifp, struct packet_type *pt,
 	struct aoe_hdr *h;
 	u32 n;
 
-	if (ifp->nd_net != &init_net)
+	if (dev_net(ifp) != &init_net)
 		goto exit;
 
 	skb = skb_share_check(skb, GFP_ATOMIC);

drivers/net/bonding/bond_3ad.c

@@ -2429,7 +2429,7 @@ int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct net_device *dev, struct pac
 	struct slave *slave = NULL;
 	int ret = NET_RX_DROP;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		goto out;
 
 	if (!(dev->flags & IFF_MASTER))

drivers/net/bonding/bond_alb.c

@@ -345,7 +345,7 @@ static int rlb_arp_recv(struct sk_buff *skb, struct net_device *bond_dev, struct
 	struct arp_pkt *arp = (struct arp_pkt *)skb->data;
 	int res = NET_RX_DROP;
 
-	if (bond_dev->nd_net != &init_net)
+	if (dev_net(bond_dev) != &init_net)
 		goto out;
 
 	if (!(bond_dev->flags & IFF_MASTER))

drivers/net/bonding/bond_main.c

@@ -2629,7 +2629,7 @@ static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct pack
 	unsigned char *arp_ptr;
 	__be32 sip, tip;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		goto out;
 
 	if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
@@ -3470,7 +3470,7 @@ static int bond_netdev_event(struct notifier_block *this, unsigned long event, v
 {
 	struct net_device *event_dev = (struct net_device *)ptr;
 
-	if (event_dev->nd_net != &init_net)
+	if (dev_net(event_dev) != &init_net)
 		return NOTIFY_DONE;
 
 	dprintk("event_dev: %s, event: %lx\n",
@@ -3508,7 +3508,7 @@ static int bond_inetaddr_event(struct notifier_block *this, unsigned long event,
 	struct bonding *bond, *bond_next;
 	struct vlan_entry *vlan, *vlan_next;
 
-	if (ifa->ifa_dev->dev->nd_net != &init_net)
+	if (dev_net(ifa->ifa_dev->dev) != &init_net)
 		return NOTIFY_DONE;
 
 	list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {

drivers/net/hamradio/bpqether.c

@@ -172,7 +172,7 @@ static int bpq_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_ty
 	struct ethhdr *eth;
 	struct bpqdev *bpq;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		goto drop;
 
 	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
@@ -553,7 +553,7 @@ static int bpq_device_event(struct notifier_block *this,unsigned long event, voi
 {
 	struct net_device *dev = (struct net_device *)ptr;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		return NOTIFY_DONE;
 
 	if (!dev_is_ethdev(dev))

drivers/net/loopback.c

@@ -258,7 +258,7 @@ static __net_init int loopback_net_init(struct net *net)
 	if (!dev)
 		goto out;
 
-	dev->nd_net = net;
+	dev_net_set(dev, net);
 	err = register_netdev(dev);
 	if (err)
 		goto out_free_netdev;

drivers/net/macvlan.c

@@ -402,7 +402,7 @@ static int macvlan_newlink(struct net_device *dev,
 	if (!tb[IFLA_LINK])
 		return -EINVAL;
 
-	lowerdev = __dev_get_by_index(dev->nd_net, nla_get_u32(tb[IFLA_LINK]));
+	lowerdev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
 	if (lowerdev == NULL)
 		return -ENODEV;
 

drivers/net/pppoe.c

@@ -301,7 +301,7 @@ static int pppoe_device_event(struct notifier_block *this,
 {
 	struct net_device *dev = (struct net_device *) ptr;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		return NOTIFY_DONE;
 
 	/* Only look at sockets that are using this specific device. */
@@ -392,7 +392,7 @@ static int pppoe_rcv(struct sk_buff *skb,
 	if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
 		goto out;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		goto drop;
 
 	if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
@@ -424,7 +424,7 @@ static int pppoe_disc_rcv(struct sk_buff *skb,
 	struct pppoe_hdr *ph;
 	struct pppox_sock *po;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		goto abort;
 
 	if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))

drivers/net/veth.c

@@ -375,7 +375,7 @@ static int veth_newlink(struct net_device *dev,
 	else
 		snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
 
-	peer = rtnl_create_link(dev->nd_net, ifname, &veth_link_ops, tbp);
+	peer = rtnl_create_link(dev_net(dev), ifname, &veth_link_ops, tbp);
 	if (IS_ERR(peer))
 		return PTR_ERR(peer);
 

drivers/net/via-velocity.c

@@ -3464,7 +3464,7 @@ static int velocity_netdev_event(struct notifier_block *nb, unsigned long notifi
 	struct velocity_info *vptr;
 	unsigned long flags;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		return NOTIFY_DONE;
 
 	spin_lock_irqsave(&velocity_dev_list_lock, flags);

drivers/net/wan/dlci.c

@@ -517,7 +517,7 @@ static int dlci_dev_event(struct notifier_block *unused,
 {
 	struct net_device *dev = (struct net_device *) ptr;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		return NOTIFY_DONE;
 
 	if (event == NETDEV_UNREGISTER) {

drivers/net/wan/hdlc.c

@@ -68,7 +68,7 @@ static int hdlc_rcv(struct sk_buff *skb, struct net_device *dev,
 {
 	struct hdlc_device *hdlc = dev_to_hdlc(dev);
 
-	if (dev->nd_net != &init_net) {
+	if (dev_net(dev) != &init_net) {
 		kfree_skb(skb);
 		return 0;
 	}
@@ -105,7 +105,7 @@ static int hdlc_device_event(struct notifier_block *this, unsigned long event,
 	unsigned long flags;
 	int on;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		return NOTIFY_DONE;
 
 	if (dev->get_stats != hdlc_get_stats)

drivers/net/wan/lapbether.c

@@ -91,7 +91,7 @@ static int lapbeth_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
 	int len, err;
 	struct lapbethdev *lapbeth;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		goto drop;
 
 	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
@@ -393,7 +393,7 @@ static int lapbeth_device_event(struct notifier_block *this,
 	struct lapbethdev *lapbeth;
 	struct net_device *dev = ptr;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		return NOTIFY_DONE;
 
 	if (!dev_is_ethdev(dev))

drivers/net/wan/syncppp.c

@@ -1444,7 +1444,7 @@ static void sppp_print_bytes (u_char *p, u16 len)
 
 static int sppp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *p, struct net_device *orig_dev)
 {
-	if (dev->nd_net != &init_net) {
+	if (dev_net(dev) != &init_net) {
 		kfree_skb(skb);
 		return 0;
 	}

drivers/s390/net/qeth_l3_main.c

@@ -3250,7 +3250,7 @@ static int qeth_l3_ip_event(struct notifier_block *this,
 	struct qeth_ipaddr *addr;
 	struct qeth_card *card;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		return NOTIFY_DONE;
 
 	QETH_DBF_TEXT(trace, 3, "ipevent");

include/linux/inetdevice.h

@@ -70,13 +70,13 @@ static inline void ipv4_devconf_setall(struct in_device *in_dev)
 	ipv4_devconf_set((in_dev), NET_IPV4_CONF_ ## attr, (val))
 
 #define IN_DEV_ANDCONF(in_dev, attr) \
-	(IPV4_DEVCONF_ALL(in_dev->dev->nd_net, attr) && \
+	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
 	 IN_DEV_CONF_GET((in_dev), attr))
 #define IN_DEV_ORCONF(in_dev, attr) \
-	(IPV4_DEVCONF_ALL(in_dev->dev->nd_net, attr) || \
+	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) || \
 	 IN_DEV_CONF_GET((in_dev), attr))
 #define IN_DEV_MAXCONF(in_dev, attr) \
-	(max(IPV4_DEVCONF_ALL(in_dev->dev->nd_net, attr), \
+	(max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
 	     IN_DEV_CONF_GET((in_dev), attr)))
 
 #define IN_DEV_FORWARD(in_dev)		IN_DEV_CONF_GET((in_dev), FORWARDING)

include/linux/netdevice.h

@@ -708,8 +708,10 @@ struct net_device
 	void                    (*poll_controller)(struct net_device *dev);
 #endif
 
+#ifdef CONFIG_NET_NS
 	/* Network namespace this network device is inside */
 	struct net		*nd_net;
+#endif
 
 	/* bridge stuff */
 	struct net_bridge_port	*br_port;
@@ -737,6 +739,27 @@ struct net_device
 #define	NETDEV_ALIGN		32
 #define	NETDEV_ALIGN_CONST	(NETDEV_ALIGN - 1)
 
+/*
+ * Net namespace inlines
+ */
+static inline
+struct net *dev_net(const struct net_device *dev)
+{
+#ifdef CONFIG_NET_NS
+	return dev->nd_net;
+#else
+	return &init_net;
+#endif
+}
+
+static inline
+void dev_net_set(struct net_device *dev, const struct net *net)
+{
+#ifdef CONFIG_NET_NS
+	dev->nd_dev = net;
+#endif
+}
+
 /**
  *	netdev_priv - access network device private data
  *	@dev: network device
@@ -813,7 +836,7 @@ static inline struct net_device *next_net_device(struct net_device *dev)
 	struct list_head *lh;
 	struct net *net;
 
-	net = dev->nd_net;
+	net = dev_net(dev);
 	lh = dev->dev_list.next;
 	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
 }

net/8021q/vlan.c

@@ -382,7 +382,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 	int i, flgs;
 	struct net_device *vlandev;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		return NOTIFY_DONE;
 
 	if (!grp)

net/8021q/vlan_dev.c

@@ -153,7 +153,7 @@ int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
 	struct net_device_stats *stats;
 	unsigned short vlan_TCI;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		goto err_free;
 
 	skb = skb_share_check(skb, GFP_ATOMIC);

net/appletalk/aarp.c

@@ -333,7 +333,7 @@ static int aarp_device_event(struct notifier_block *this, unsigned long event,
 	struct net_device *dev = ptr;
 	int ct;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		return NOTIFY_DONE;
 
 	if (event == NETDEV_DOWN) {
@@ -716,7 +716,7 @@ static int aarp_rcv(struct sk_buff *skb, struct net_device *dev,
 	struct atalk_addr sa, *ma, da;
 	struct atalk_iface *ifa;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		goto out0;
 
 	/* We only do Ethernet SNAP AARP. */

net/appletalk/ddp.c

@@ -648,7 +648,7 @@ static int ddp_device_event(struct notifier_block *this, unsigned long event,
 {
 	struct net_device *dev = ptr;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		return NOTIFY_DONE;
 
 	if (event == NETDEV_DOWN)
@@ -1405,7 +1405,7 @@ static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
 	int origlen;
 	__u16 len_hops;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		goto freeit;
 
 	/* Don't mangle buffer if shared */
@@ -1493,7 +1493,7 @@ static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
 static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
 		     struct packet_type *pt, struct net_device *orig_dev)
 {
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		goto freeit;
 
 	/* Expand any short form frames */

net/atm/clip.c

@@ -612,7 +612,7 @@ static int clip_device_event(struct notifier_block *this, unsigned long event,
 {
 	struct net_device *dev = arg;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		return NOTIFY_DONE;
 
 	if (event == NETDEV_UNREGISTER) {

net/atm/mpc.c

@@ -964,7 +964,7 @@ static int mpoa_event_listener(struct notifier_block *mpoa_notifier, unsigned lo
 
 	dev = (struct net_device *)dev_ptr;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		return NOTIFY_DONE;
 
 	if (dev->name == NULL || strncmp(dev->name, "lec", 3))

net/ax25/af_ax25.c

@@ -116,7 +116,7 @@ static int ax25_device_event(struct notifier_block *this, unsigned long event,
 {
 	struct net_device *dev = (struct net_device *)ptr;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		return NOTIFY_DONE;
 
 	/* Reject non AX.25 devices */

net/ax25/ax25_in.c

@@ -451,7 +451,7 @@ int ax25_kiss_rcv(struct sk_buff *skb, struct net_device *dev,
 	skb->sk = NULL;		/* Initially we don't know who it's for */
 	skb->destructor = NULL;	/* Who initializes this, dammit?! */
 
-	if (dev->nd_net != &init_net) {
+	if (dev_net(dev) != &init_net) {
 		kfree_skb(skb);
 		return 0;
 	}

net/bridge/br_notify.c

@@ -37,7 +37,7 @@ static int br_device_event(struct notifier_block *unused, unsigned long event, v
 	struct net_bridge_port *p = dev->br_port;
 	struct net_bridge *br;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		return NOTIFY_DONE;
 
 	/* not a port of a bridge */

net/bridge/br_stp_bpdu.c

@@ -142,7 +142,7 @@ int br_stp_rcv(struct sk_buff *skb, struct net_device *dev,
 	struct net_bridge *br;
 	const unsigned char *buf;
 
-	if (dev->nd_net != &init_net)
+	if (dev_net(dev) != &init_net)
 		goto err;
 
 	if (!p)