net: CONFIG_NET_NS reduction

Use read_pnet() and write_pnet() to reduce number of ifdef CONFIG_NET_NS

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netdevice.h

@@ -1087,11 +1087,7 @@ static inline void netdev_for_each_tx_queue(struct net_device *dev,
 static inline
 struct net *dev_net(const struct net_device *dev)
 {
-#ifdef CONFIG_NET_NS
+	return read_pnet(&dev->nd_net);
-	return dev->nd_net;
-#else
-	return &init_net;
-#endif
 }
 
 static inline

include/net/cfg80211.h

@@ -1330,26 +1330,15 @@ struct wiphy {
 	char priv[0] __attribute__((__aligned__(NETDEV_ALIGN)));
 };
 
-#ifdef CONFIG_NET_NS
 static inline struct net *wiphy_net(struct wiphy *wiphy)
 {
-	return wiphy->_net;
+	return read_pnet(&wiphy->_net);
 }
 
 static inline void wiphy_net_set(struct wiphy *wiphy, struct net *net)
 {
-	wiphy->_net = net;
+	write_pnet(&wiphy->_net, net);
 }
-#else
-static inline struct net *wiphy_net(struct wiphy *wiphy)
-{
-	return &init_net;
-}
-
-static inline void wiphy_net_set(struct wiphy *wiphy, struct net *net)
-{
-}
-#endif
 
 /**
  * wiphy_priv - return priv from wiphy

include/net/genetlink.h

@@ -68,26 +68,15 @@ struct genl_info {
 #endif
 };
 
-#ifdef CONFIG_NET_NS
 static inline struct net *genl_info_net(struct genl_info *info)
 {
-	return info->_net;
+	return read_pnet(&info->_net);
 }
 
 static inline void genl_info_net_set(struct genl_info *info, struct net *net)
 {
-	info->_net = net;
+	write_pnet(&info->_net, net);
 }
-#else
-static inline struct net *genl_info_net(struct genl_info *info)
-{
-	return &init_net;
-}
-
-static inline void genl_info_net_set(struct genl_info *info, struct net *net)
-{
-}
-#endif
 
 /**
  * struct genl_ops - generic netlink operations

include/net/netfilter/nf_conntrack.h

@@ -152,11 +152,7 @@ extern struct net init_net;
 
 static inline struct net *nf_ct_net(const struct nf_conn *ct)
 {
-#ifdef CONFIG_NET_NS
+	return read_pnet(&ct->ct_net);
-	return ct->ct_net;
-#else
-	return &init_net;
-#endif
 }
 
 /* Alter reply tuple (maybe alter helper). */

include/net/sock.h

@@ -1724,19 +1724,13 @@ static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_e
 static inline
 struct net *sock_net(const struct sock *sk)
 {
-#ifdef CONFIG_NET_NS
+	return read_pnet(&sk->sk_net);
-	return sk->sk_net;
-#else
-	return &init_net;
-#endif
 }
 
 static inline
 void sock_net_set(struct sock *sk, struct net *net)
 {
-#ifdef CONFIG_NET_NS
+	write_pnet(&sk->sk_net, net);
-	sk->sk_net = net;
-#endif
 }
 
 /*

net/ipv6/addrlabel.c

@@ -53,11 +53,7 @@ static struct ip6addrlbl_table
 static inline
 struct net *ip6addrlbl_net(const struct ip6addrlbl_entry *lbl)
 {
-#ifdef CONFIG_NET_NS
+	return read_pnet(&lbl->lbl_net);
-	return lbl->lbl_net;
-#else
-	return &init_net;
-#endif
 }
 
 /*

net/netfilter/nf_conntrack_core.c

@@ -619,9 +619,7 @@ struct nf_conn *nf_conntrack_alloc(struct net *net, u16 zone,
 	ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev = NULL;
 	/* Don't set timer yet: wait for confirmation */
 	setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct);
-#ifdef CONFIG_NET_NS
+	write_pnet(&ct->ct_net, net);
-	ct->ct_net = net;
-#endif
 #ifdef CONFIG_NF_CONNTRACK_ZONES
 	if (zone) {
 		struct nf_conntrack_zone *nf_ct_zone;
@@ -1363,9 +1361,7 @@ static int nf_conntrack_init_init_net(void)
 		goto err_extend;
 #endif
 	/* Set up fake conntrack: to never be deleted, not in any hashes */
-#ifdef CONFIG_NET_NS
+	write_pnet(&nf_conntrack_untracked.ct_net, &init_net);
-	nf_conntrack_untracked.ct_net = &init_net;
-#endif
 	atomic_set(&nf_conntrack_untracked.ct_general.use, 1);
 	/*  - and look it like as a confirmed connection */
 	set_bit(IPS_CONFIRMED_BIT, &nf_conntrack_untracked.status);