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/core.h> 12 #include <net/netns/mib.h> 13 #include <net/netns/unix.h> 14 #include <net/netns/packet.h> 15 #include <net/netns/ipv4.h> 16 #include <net/netns/ipv6.h> 17 #include <net/netns/dccp.h> 18 #include <net/netns/x_tables.h> 19 20 struct proc_dir_entry; 21 struct net_device; 22 struct sock; 23 struct ctl_table_header; 24 struct net_generic; 25 26 struct net { 27 atomic_t count; /* To decided when the network 28 * namespace should be freed. 29 */ 30 #ifdef NETNS_REFCNT_DEBUG 31 atomic_t use_count; /* To track references we 32 * destroy on demand 33 */ 34 #endif 35 struct list_head list; /* list of network namespaces */ 36 struct work_struct work; /* work struct for freeing */ 37 38 struct proc_dir_entry *proc_net; 39 struct proc_dir_entry *proc_net_stat; 40 41 struct list_head sysctl_table_headers; 42 43 struct net_device *loopback_dev; /* The loopback */ 44 45 struct list_head dev_base_head; 46 struct hlist_head *dev_name_head; 47 struct hlist_head *dev_index_head; 48 49 /* core fib_rules */ 50 struct list_head rules_ops; 51 spinlock_t rules_mod_lock; 52 53 struct sock *rtnl; /* rtnetlink socket */ 54 55 struct netns_core core; 56 struct netns_mib mib; 57 struct netns_packet packet; 58 struct netns_unix unx; 59 struct netns_ipv4 ipv4; 60 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 61 struct netns_ipv6 ipv6; 62 #endif 63 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) 64 struct netns_dccp dccp; 65 #endif 66 #ifdef CONFIG_NETFILTER 67 struct netns_xt xt; 68 #endif 69 struct net_generic *gen; 70 }; 71 72 73 #include <linux/seq_file_net.h> 74 75 /* Init's network namespace */ 76 extern struct net init_net; 77 78 #ifdef CONFIG_NET 79 #define INIT_NET_NS(net_ns) .net_ns = &init_net, 80 81 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns); 82 83 #else /* CONFIG_NET */ 84 85 #define INIT_NET_NS(net_ns) 86 87 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns) 88 { 89 /* There is nothing to copy so this is a noop */ 90 return net_ns; 91 } 92 #endif /* CONFIG_NET */ 93 94 95 extern struct list_head net_namespace_list; 96 97 #ifdef CONFIG_NET_NS 98 extern void __put_net(struct net *net); 99 100 static inline int net_alive(struct net *net) 101 { 102 return net && atomic_read(&net->count); 103 } 104 105 static inline struct net *get_net(struct net *net) 106 { 107 atomic_inc(&net->count); 108 return net; 109 } 110 111 static inline struct net *maybe_get_net(struct net *net) 112 { 113 /* Used when we know struct net exists but we 114 * aren't guaranteed a previous reference count 115 * exists. If the reference count is zero this 116 * function fails and returns NULL. 117 */ 118 if (!atomic_inc_not_zero(&net->count)) 119 net = NULL; 120 return net; 121 } 122 123 static inline void put_net(struct net *net) 124 { 125 if (atomic_dec_and_test(&net->count)) 126 __put_net(net); 127 } 128 129 static inline 130 int net_eq(const struct net *net1, const struct net *net2) 131 { 132 return net1 == net2; 133 } 134 #else 135 136 static inline int net_alive(struct net *net) 137 { 138 return 1; 139 } 140 141 static inline struct net *get_net(struct net *net) 142 { 143 return net; 144 } 145 146 static inline void put_net(struct net *net) 147 { 148 } 149 150 static inline struct net *maybe_get_net(struct net *net) 151 { 152 return net; 153 } 154 155 static inline 156 int net_eq(const struct net *net1, const struct net *net2) 157 { 158 return 1; 159 } 160 #endif 161 162 163 #ifdef NETNS_REFCNT_DEBUG 164 static inline struct net *hold_net(struct net *net) 165 { 166 if (net) 167 atomic_inc(&net->use_count); 168 return net; 169 } 170 171 static inline void release_net(struct net *net) 172 { 173 if (net) 174 atomic_dec(&net->use_count); 175 } 176 #else 177 static inline struct net *hold_net(struct net *net) 178 { 179 return net; 180 } 181 182 static inline void release_net(struct net *net) 183 { 184 } 185 #endif 186 187 188 #define for_each_net(VAR) \ 189 list_for_each_entry(VAR, &net_namespace_list, list) 190 191 #ifdef CONFIG_NET_NS 192 #define __net_init 193 #define __net_exit 194 #define __net_initdata 195 #else 196 #define __net_init __init 197 #define __net_exit __exit_refok 198 #define __net_initdata __initdata 199 #endif 200 201 struct pernet_operations { 202 struct list_head list; 203 int (*init)(struct net *net); 204 void (*exit)(struct net *net); 205 }; 206 207 extern int register_pernet_subsys(struct pernet_operations *); 208 extern void unregister_pernet_subsys(struct pernet_operations *); 209 extern int register_pernet_device(struct pernet_operations *); 210 extern void unregister_pernet_device(struct pernet_operations *); 211 extern int register_pernet_gen_device(int *id, struct pernet_operations *); 212 extern void unregister_pernet_gen_device(int id, struct pernet_operations *); 213 214 struct ctl_path; 215 struct ctl_table; 216 struct ctl_table_header; 217 218 extern struct ctl_table_header *register_net_sysctl_table(struct net *net, 219 const struct ctl_path *path, struct ctl_table *table); 220 extern struct ctl_table_header *register_net_sysctl_rotable( 221 const struct ctl_path *path, struct ctl_table *table); 222 extern void unregister_net_sysctl_table(struct ctl_table_header *header); 223 224 #endif /* __NET_NET_NAMESPACE_H */ 225