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authorEric W. Biederman <ebiederm@xmission.com>2015-03-12 07:06:44 +0300
committerDavid S. Miller <davem@davemloft.net>2015-03-12 21:39:40 +0300
commit0c5c9fb55106333e773de8c9dd321fa8240caeb3 (patch)
treeda550b771a52ba583eb97c1ad00fffbf3ae17f73 /include
parentefd7ef1c1929d7a0329d4349252863c04d6f1729 (diff)
downloadlinux-0c5c9fb55106333e773de8c9dd321fa8240caeb3.tar.xz
net: Introduce possible_net_t
Having to say > #ifdef CONFIG_NET_NS > struct net *net; > #endif in structures is a little bit wordy and a little bit error prone. Instead it is possible to say: > typedef struct { > #ifdef CONFIG_NET_NS > struct net *net; > #endif > } possible_net_t; And then in a header say: > possible_net_t net; Which is cleaner and easier to use and easier to test, as the possible_net_t is always there no matter what the compile options. Further this allows read_pnet and write_pnet to be functions in all cases which is better at catching typos. This change adds possible_net_t, updates the definitions of read_pnet and write_pnet, updates optional struct net * variables that write_pnet uses on to have the type possible_net_t, and finally fixes up the b0rked users of read_pnet and write_pnet. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/netdevice.h8
-rw-r--r--include/net/cfg80211.h4
-rw-r--r--include/net/genetlink.h4
-rw-r--r--include/net/inet_hashtables.h4
-rw-r--r--include/net/ip_vs.h8
-rw-r--r--include/net/neighbour.h8
-rw-r--r--include/net/net_namespace.h23
-rw-r--r--include/net/netfilter/nf_conntrack.h5
-rw-r--r--include/net/sock.h4
-rw-r--r--include/net/xfrm.h8
10 files changed, 29 insertions, 47 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index cede40d9cac9..ddab1a2a07a0 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1721,9 +1721,7 @@ struct net_device {
struct netpoll_info __rcu *npinfo;
#endif
-#ifdef CONFIG_NET_NS
- struct net *nd_net;
-#endif
+ possible_net_t nd_net;
/* mid-layer private */
union {
@@ -1863,9 +1861,7 @@ struct net *dev_net(const struct net_device *dev)
static inline
void dev_net_set(struct net_device *dev, struct net *net)
{
-#ifdef CONFIG_NET_NS
- dev->nd_net = net;
-#endif
+ write_pnet(&dev->nd_net, net);
}
static inline bool netdev_uses_dsa(struct net_device *dev)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 64e09e1e8099..f977abec07f6 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -3183,10 +3183,8 @@ struct wiphy {
const struct ieee80211_ht_cap *ht_capa_mod_mask;
const struct ieee80211_vht_cap *vht_capa_mod_mask;
-#ifdef CONFIG_NET_NS
/* the network namespace this phy lives in currently */
- struct net *_net;
-#endif
+ possible_net_t _net;
#ifdef CONFIG_CFG80211_WEXT
const struct iw_handler_def *wext;
diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index 0574abd3db86..a9af1cc8c1bc 100644
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -92,9 +92,7 @@ struct genl_info {
struct genlmsghdr * genlhdr;
void * userhdr;
struct nlattr ** attrs;
-#ifdef CONFIG_NET_NS
- struct net * _net;
-#endif
+ possible_net_t _net;
void * user_ptr[2];
struct sock * dst_sk;
};
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index dd1950a7e273..bcd64756e5fe 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -76,9 +76,7 @@ struct inet_ehash_bucket {
* ports are created in O(1) time? I thought so. ;-) -DaveM
*/
struct inet_bind_bucket {
-#ifdef CONFIG_NET_NS
- struct net *ib_net;
-#endif
+ possible_net_t ib_net;
unsigned short port;
signed char fastreuse;
signed char fastreuseport;
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 20fd23398537..4e3731ee4eac 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -47,13 +47,13 @@ static inline struct net *skb_net(const struct sk_buff *skb)
* Start with the most likely hit
* End with BUG
*/
- if (likely(skb->dev && skb->dev->nd_net))
+ if (likely(skb->dev && dev_net(skb->dev)))
return dev_net(skb->dev);
if (skb_dst(skb) && skb_dst(skb)->dev)
return dev_net(skb_dst(skb)->dev);
WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n",
__func__, __LINE__);
- if (likely(skb->sk && skb->sk->sk_net))
+ if (likely(skb->sk && sock_net(skb->sk)))
return sock_net(skb->sk);
pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
__func__, __LINE__);
@@ -71,11 +71,11 @@ static inline struct net *skb_sknet(const struct sk_buff *skb)
#ifdef CONFIG_NET_NS
#ifdef CONFIG_IP_VS_DEBUG
/* Start with the most likely hit */
- if (likely(skb->sk && skb->sk->sk_net))
+ if (likely(skb->sk && sock_net(skb->sk)))
return sock_net(skb->sk);
WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n",
__func__, __LINE__);
- if (likely(skb->dev && skb->dev->nd_net))
+ if (likely(skb->dev && dev_net(skb->dev)))
return dev_net(skb->dev);
pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
__func__, __LINE__);
diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index d48b8ec8b5f4..e7bdf5170802 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -65,9 +65,7 @@ enum {
};
struct neigh_parms {
-#ifdef CONFIG_NET_NS
- struct net *net;
-#endif
+ possible_net_t net;
struct net_device *dev;
struct list_head list;
int (*neigh_setup)(struct neighbour *);
@@ -167,9 +165,7 @@ struct neigh_ops {
struct pneigh_entry {
struct pneigh_entry *next;
-#ifdef CONFIG_NET_NS
- struct net *net;
-#endif
+ possible_net_t net;
struct net_device *dev;
u8 flags;
u8 key[0];
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index fab51ceeabf3..f733656404de 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -231,24 +231,27 @@ int net_eq(const struct net *net1, const struct net *net2)
#endif
+typedef struct {
#ifdef CONFIG_NET_NS
+ struct net *net;
+#endif
+} possible_net_t;
-static inline void write_pnet(struct net **pnet, struct net *net)
+static inline void write_pnet(possible_net_t *pnet, struct net *net)
{
- *pnet = net;
+#ifdef CONFIG_NET_NS
+ pnet->net = net;
+#endif
}
-static inline struct net *read_pnet(struct net * const *pnet)
+static inline struct net *read_pnet(const possible_net_t *pnet)
{
- return *pnet;
-}
-
+#ifdef CONFIG_NET_NS
+ return pnet->net;
#else
-
-#define write_pnet(pnet, net) do { (void)(net);} while (0)
-#define read_pnet(pnet) (&init_net)
-
+ return &init_net;
#endif
+}
#define for_each_net(VAR) \
list_for_each_entry(VAR, &net_namespace_list, list)
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index 74f271a172dd..095433b8a8b0 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -95,9 +95,8 @@ struct nf_conn {
/* Timer function; drops refcnt when it goes off. */
struct timer_list timeout;
-#ifdef CONFIG_NET_NS
- struct net *ct_net;
-#endif
+ possible_net_t ct_net;
+
/* all members below initialized via memset */
u8 __nfct_init_offset[0];
diff --git a/include/net/sock.h b/include/net/sock.h
index 95b2c1c220f9..9411c3421dd3 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -190,9 +190,7 @@ struct sock_common {
struct hlist_nulls_node skc_portaddr_node;
};
struct proto *skc_prot;
-#ifdef CONFIG_NET_NS
- struct net *skc_net;
-#endif
+ possible_net_t skc_net;
#if IS_ENABLED(CONFIG_IPV6)
struct in6_addr skc_v6_daddr;
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index dc4865e90fe4..d0ac7d7be8a7 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -126,9 +126,7 @@ struct xfrm_state_walk {
/* Full description of state of transformer. */
struct xfrm_state {
-#ifdef CONFIG_NET_NS
- struct net *xs_net;
-#endif
+ possible_net_t xs_net;
union {
struct hlist_node gclist;
struct hlist_node bydst;
@@ -522,9 +520,7 @@ struct xfrm_policy_queue {
};
struct xfrm_policy {
-#ifdef CONFIG_NET_NS
- struct net *xp_net;
-#endif
+ possible_net_t xp_net;
struct hlist_node bydst;
struct hlist_node byidx;