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 struct proc_dir_entry *proc_net_root; 35 36 struct list_head sysctl_table_headers; 37 38 struct net_device *loopback_dev; /* The loopback */ 39 40 struct list_head dev_base_head; 41 struct hlist_head *dev_name_head; 42 struct hlist_head *dev_index_head; 43 44 /* core fib_rules */ 45 struct list_head rules_ops; 46 spinlock_t rules_mod_lock; 47 48 struct sock *rtnl; /* rtnetlink socket */ 49 50 /* core sysctls */ 51 struct ctl_table_header *sysctl_core_hdr; 52 int sysctl_somaxconn; 53 54 struct netns_packet packet; 55 struct netns_unix unx; 56 struct netns_ipv4 ipv4; 57 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 58 struct netns_ipv6 ipv6; 59 #endif 60 #ifdef CONFIG_NETFILTER 61 struct netns_xt xt; 62 #endif 63 }; 64 65 #ifdef CONFIG_NET 66 /* Init's network namespace */ 67 extern struct net init_net; 68 #define INIT_NET_NS(net_ns) .net_ns = &init_net, 69 #else 70 #define INIT_NET_NS(net_ns) 71 #endif 72 73 extern struct list_head net_namespace_list; 74 75 #ifdef CONFIG_NET 76 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns); 77 #else 78 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns) 79 { 80 /* There is nothing to copy so this is a noop */ 81 return net_ns; 82 } 83 #endif 84 85 #ifdef CONFIG_NET_NS 86 extern void __put_net(struct net *net); 87 88 static inline struct net *get_net(struct net *net) 89 { 90 atomic_inc(&net->count); 91 return net; 92 } 93 94 static inline struct net *maybe_get_net(struct net *net) 95 { 96 /* Used when we know struct net exists but we 97 * aren't guaranteed a previous reference count 98 * exists. If the reference count is zero this 99 * function fails and returns NULL. 100 */ 101 if (!atomic_inc_not_zero(&net->count)) 102 net = NULL; 103 return net; 104 } 105 106 static inline void put_net(struct net *net) 107 { 108 if (atomic_dec_and_test(&net->count)) 109 __put_net(net); 110 } 111 112 static inline struct net *hold_net(struct net *net) 113 { 114 atomic_inc(&net->use_count); 115 return net; 116 } 117 118 static inline void release_net(struct net *net) 119 { 120 atomic_dec(&net->use_count); 121 } 122 #else 123 static inline struct net *get_net(struct net *net) 124 { 125 return net; 126 } 127 128 static inline void put_net(struct net *net) 129 { 130 } 131 132 static inline struct net *hold_net(struct net *net) 133 { 134 return net; 135 } 136 137 static inline void release_net(struct net *net) 138 { 139 } 140 141 static inline struct net *maybe_get_net(struct net *net) 142 { 143 return net; 144 } 145 #endif 146 147 #define for_each_net(VAR) \ 148 list_for_each_entry(VAR, &net_namespace_list, list) 149 150 #ifdef CONFIG_NET_NS 151 #define __net_init 152 #define __net_exit 153 #define __net_initdata 154 #else 155 #define __net_init __init 156 #define __net_exit __exit_refok 157 #define __net_initdata __initdata 158 #endif 159 160 struct pernet_operations { 161 struct list_head list; 162 int (*init)(struct net *net); 163 void (*exit)(struct net *net); 164 }; 165 166 extern int register_pernet_subsys(struct pernet_operations *); 167 extern void unregister_pernet_subsys(struct pernet_operations *); 168 extern int register_pernet_device(struct pernet_operations *); 169 extern void unregister_pernet_device(struct pernet_operations *); 170 171 struct ctl_path; 172 struct ctl_table; 173 struct ctl_table_header; 174 extern struct ctl_table_header *register_net_sysctl_table(struct net *net, 175 const struct ctl_path *path, struct ctl_table *table); 176 extern void unregister_net_sysctl_table(struct ctl_table_header *header); 177 178 #endif /* __NET_NET_NAMESPACE_H */ 179