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 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 20 #include <net/netns/conntrack.h> 21 #endif 22 #include <net/netns/xfrm.h> 23 24 struct proc_dir_entry; 25 struct net_device; 26 struct sock; 27 struct ctl_table_header; 28 struct net_generic; 29 30 struct net { 31 atomic_t count; /* To decided when the network 32 * namespace should be freed. 33 */ 34 #ifdef NETNS_REFCNT_DEBUG 35 atomic_t use_count; /* To track references we 36 * destroy on demand 37 */ 38 #endif 39 struct list_head list; /* list of network namespaces */ 40 struct work_struct work; /* work struct for freeing */ 41 42 struct proc_dir_entry *proc_net; 43 struct proc_dir_entry *proc_net_stat; 44 45 #ifdef CONFIG_SYSCTL 46 struct ctl_table_set sysctls; 47 #endif 48 49 struct net_device *loopback_dev; /* The loopback */ 50 51 struct list_head dev_base_head; 52 struct hlist_head *dev_name_head; 53 struct hlist_head *dev_index_head; 54 55 /* core fib_rules */ 56 struct list_head rules_ops; 57 spinlock_t rules_mod_lock; 58 59 struct sock *rtnl; /* rtnetlink socket */ 60 61 struct netns_core core; 62 struct netns_mib mib; 63 struct netns_packet packet; 64 struct netns_unix unx; 65 struct netns_ipv4 ipv4; 66 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 67 struct netns_ipv6 ipv6; 68 #endif 69 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) 70 struct netns_dccp dccp; 71 #endif 72 #ifdef CONFIG_NETFILTER 73 struct netns_xt xt; 74 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 75 struct netns_ct ct; 76 #endif 77 #endif 78 #ifdef CONFIG_XFRM 79 struct netns_xfrm xfrm; 80 #endif 81 struct net_generic *gen; 82 }; 83 84 85 #include <linux/seq_file_net.h> 86 87 /* Init's network namespace */ 88 extern struct net init_net; 89 90 #ifdef CONFIG_NET 91 #define INIT_NET_NS(net_ns) .net_ns = &init_net, 92 93 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns); 94 95 #else /* CONFIG_NET */ 96 97 #define INIT_NET_NS(net_ns) 98 99 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns) 100 { 101 /* There is nothing to copy so this is a noop */ 102 return net_ns; 103 } 104 #endif /* CONFIG_NET */ 105 106 107 extern struct list_head net_namespace_list; 108 109 #ifdef CONFIG_NET_NS 110 extern void __put_net(struct net *net); 111 112 static inline int net_alive(struct net *net) 113 { 114 return net && atomic_read(&net->count); 115 } 116 117 static inline struct net *get_net(struct net *net) 118 { 119 atomic_inc(&net->count); 120 return net; 121 } 122 123 static inline struct net *maybe_get_net(struct net *net) 124 { 125 /* Used when we know struct net exists but we 126 * aren't guaranteed a previous reference count 127 * exists. If the reference count is zero this 128 * function fails and returns NULL. 129 */ 130 if (!atomic_inc_not_zero(&net->count)) 131 net = NULL; 132 return net; 133 } 134 135 static inline void put_net(struct net *net) 136 { 137 if (atomic_dec_and_test(&net->count)) 138 __put_net(net); 139 } 140 141 static inline 142 int net_eq(const struct net *net1, const struct net *net2) 143 { 144 return net1 == net2; 145 } 146 #else 147 148 static inline int net_alive(struct net *net) 149 { 150 return 1; 151 } 152 153 static inline struct net *get_net(struct net *net) 154 { 155 return net; 156 } 157 158 static inline void put_net(struct net *net) 159 { 160 } 161 162 static inline struct net *maybe_get_net(struct net *net) 163 { 164 return net; 165 } 166 167 static inline 168 int net_eq(const struct net *net1, const struct net *net2) 169 { 170 return 1; 171 } 172 #endif 173 174 175 #ifdef NETNS_REFCNT_DEBUG 176 static inline struct net *hold_net(struct net *net) 177 { 178 if (net) 179 atomic_inc(&net->use_count); 180 return net; 181 } 182 183 static inline void release_net(struct net *net) 184 { 185 if (net) 186 atomic_dec(&net->use_count); 187 } 188 #else 189 static inline struct net *hold_net(struct net *net) 190 { 191 return net; 192 } 193 194 static inline void release_net(struct net *net) 195 { 196 } 197 #endif 198 199 #ifdef CONFIG_NET_NS 200 201 static inline void write_pnet(struct net **pnet, struct net *net) 202 { 203 *pnet = net; 204 } 205 206 static inline struct net *read_pnet(struct net * const *pnet) 207 { 208 return *pnet; 209 } 210 211 #else 212 213 #define write_pnet(pnet, net) do { (void)(net);} while (0) 214 #define read_pnet(pnet) (&init_net) 215 216 #endif 217 218 #define for_each_net(VAR) \ 219 list_for_each_entry(VAR, &net_namespace_list, list) 220 221 #ifdef CONFIG_NET_NS 222 #define __net_init 223 #define __net_exit 224 #define __net_initdata 225 #else 226 #define __net_init __init 227 #define __net_exit __exit_refok 228 #define __net_initdata __initdata 229 #endif 230 231 struct pernet_operations { 232 struct list_head list; 233 int (*init)(struct net *net); 234 void (*exit)(struct net *net); 235 }; 236 237 extern int register_pernet_subsys(struct pernet_operations *); 238 extern void unregister_pernet_subsys(struct pernet_operations *); 239 extern int register_pernet_gen_subsys(int *id, struct pernet_operations *); 240 extern void unregister_pernet_gen_subsys(int id, struct pernet_operations *); 241 extern int register_pernet_device(struct pernet_operations *); 242 extern void unregister_pernet_device(struct pernet_operations *); 243 extern int register_pernet_gen_device(int *id, struct pernet_operations *); 244 extern void unregister_pernet_gen_device(int id, struct pernet_operations *); 245 246 struct ctl_path; 247 struct ctl_table; 248 struct ctl_table_header; 249 250 extern struct ctl_table_header *register_net_sysctl_table(struct net *net, 251 const struct ctl_path *path, struct ctl_table *table); 252 extern struct ctl_table_header *register_net_sysctl_rotable( 253 const struct ctl_path *path, struct ctl_table *table); 254 extern void unregister_net_sysctl_table(struct ctl_table_header *header); 255 256 #endif /* __NET_NET_NAMESPACE_H */ 257