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