1 /* 2 * Operations on the network namespace 3 */ 4 #ifndef __NET_NET_NAMESPACE_H 5 #define __NET_NET_NAMESPACE_H 6 7 #include <asm/atomic.h> 8 #include <linux/workqueue.h> 9 #include <linux/list.h> 10 11 #include <net/netns/unix.h> 12 #include <net/netns/packet.h> 13 #include <net/netns/ipv4.h> 14 #include <net/netns/ipv6.h> 15 #include <net/netns/x_tables.h> 16 17 struct proc_dir_entry; 18 struct net_device; 19 struct sock; 20 struct ctl_table_header; 21 22 struct net { 23 atomic_t count; /* To decided when the network 24 * namespace should be freed. 25 */ 26 atomic_t use_count; /* To track references we 27 * destroy on demand 28 */ 29 struct list_head list; /* list of network namespaces */ 30 struct work_struct work; /* work struct for freeing */ 31 32 struct proc_dir_entry *proc_net; 33 struct proc_dir_entry *proc_net_stat; 34 35 struct list_head sysctl_table_headers; 36 37 struct net_device *loopback_dev; /* The loopback */ 38 39 struct list_head dev_base_head; 40 struct hlist_head *dev_name_head; 41 struct hlist_head *dev_index_head; 42 43 /* core fib_rules */ 44 struct list_head rules_ops; 45 spinlock_t rules_mod_lock; 46 47 struct sock *rtnl; /* rtnetlink socket */ 48 49 /* core sysctls */ 50 struct ctl_table_header *sysctl_core_hdr; 51 int sysctl_somaxconn; 52 53 struct netns_packet packet; 54 struct netns_unix unx; 55 struct netns_ipv4 ipv4; 56 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 57 struct netns_ipv6 ipv6; 58 #endif 59 #ifdef CONFIG_NETFILTER 60 struct netns_xt xt; 61 #endif 62 }; 63 64 #ifdef CONFIG_NET 65 /* Init's network namespace */ 66 extern struct net init_net; 67 #define INIT_NET_NS(net_ns) .net_ns = &init_net, 68 #else 69 #define INIT_NET_NS(net_ns) 70 #endif 71 72 extern struct list_head net_namespace_list; 73 74 #ifdef CONFIG_NET 75 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns); 76 #else 77 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns) 78 { 79 /* There is nothing to copy so this is a noop */ 80 return net_ns; 81 } 82 #endif 83 84 #ifdef CONFIG_NET_NS 85 extern void __put_net(struct net *net); 86 87 static inline struct net *get_net(struct net *net) 88 { 89 atomic_inc(&net->count); 90 return net; 91 } 92 93 static inline struct net *maybe_get_net(struct net *net) 94 { 95 /* Used when we know struct net exists but we 96 * aren't guaranteed a previous reference count 97 * exists. If the reference count is zero this 98 * function fails and returns NULL. 99 */ 100 if (!atomic_inc_not_zero(&net->count)) 101 net = NULL; 102 return net; 103 } 104 105 static inline void put_net(struct net *net) 106 { 107 if (atomic_dec_and_test(&net->count)) 108 __put_net(net); 109 } 110 111 static inline struct net *hold_net(struct net *net) 112 { 113 atomic_inc(&net->use_count); 114 return net; 115 } 116 117 static inline void release_net(struct net *net) 118 { 119 atomic_dec(&net->use_count); 120 } 121 #else 122 static inline struct net *get_net(struct net *net) 123 { 124 return net; 125 } 126 127 static inline void put_net(struct net *net) 128 { 129 } 130 131 static inline struct net *hold_net(struct net *net) 132 { 133 return net; 134 } 135 136 static inline void release_net(struct net *net) 137 { 138 } 139 140 static inline struct net *maybe_get_net(struct net *net) 141 { 142 return net; 143 } 144 #endif 145 146 #define for_each_net(VAR) \ 147 list_for_each_entry(VAR, &net_namespace_list, list) 148 149 #ifdef CONFIG_NET_NS 150 #define __net_init 151 #define __net_exit 152 #define __net_initdata 153 #else 154 #define __net_init __init 155 #define __net_exit __exit_refok 156 #define __net_initdata __initdata 157 #endif 158 159 struct pernet_operations { 160 struct list_head list; 161 int (*init)(struct net *net); 162 void (*exit)(struct net *net); 163 }; 164 165 extern int register_pernet_subsys(struct pernet_operations *); 166 extern void unregister_pernet_subsys(struct pernet_operations *); 167 extern int register_pernet_device(struct pernet_operations *); 168 extern void unregister_pernet_device(struct pernet_operations *); 169 170 struct ctl_path; 171 struct ctl_table; 172 struct ctl_table_header; 173 extern struct ctl_table_header *register_net_sysctl_table(struct net *net, 174 const struct ctl_path *path, struct ctl_table *table); 175 extern void unregister_net_sysctl_table(struct ctl_table_header *header); 176 177 #endif /* __NET_NET_NAMESPACE_H */ 178