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Linux/include/net/net_namespace.h

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  1 /*
  2  * Operations on the network namespace
  3  */
  4 #ifndef __NET_NET_NAMESPACE_H
  5 #define __NET_NET_NAMESPACE_H
  6 
  7 #include <linux/atomic.h>
  8 #include <linux/workqueue.h>
  9 #include <linux/list.h>
 10 #include <linux/sysctl.h>
 11 
 12 #include <net/flow.h>
 13 #include <net/netns/core.h>
 14 #include <net/netns/mib.h>
 15 #include <net/netns/unix.h>
 16 #include <net/netns/packet.h>
 17 #include <net/netns/ipv4.h>
 18 #include <net/netns/ipv6.h>
 19 #include <net/netns/ieee802154_6lowpan.h>
 20 #include <net/netns/sctp.h>
 21 #include <net/netns/dccp.h>
 22 #include <net/netns/netfilter.h>
 23 #include <net/netns/x_tables.h>
 24 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 25 #include <net/netns/conntrack.h>
 26 #endif
 27 #include <net/netns/nftables.h>
 28 #include <net/netns/xfrm.h>
 29 #include <net/netns/mpls.h>
 30 #include <linux/ns_common.h>
 31 #include <linux/idr.h>
 32 #include <linux/skbuff.h>
 33 
 34 struct user_namespace;
 35 struct proc_dir_entry;
 36 struct net_device;
 37 struct sock;
 38 struct ctl_table_header;
 39 struct net_generic;
 40 struct sock;
 41 struct netns_ipvs;
 42 
 43 
 44 #define NETDEV_HASHBITS    8
 45 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
 46 
 47 struct net {
 48         atomic_t                passive;        /* To decided when the network
 49                                                  * namespace should be freed.
 50                                                  */
 51         atomic_t                count;          /* To decided when the network
 52                                                  *  namespace should be shut down.
 53                                                  */
 54         spinlock_t              rules_mod_lock;
 55 
 56         atomic64_t              cookie_gen;
 57 
 58         struct list_head        list;           /* list of network namespaces */
 59         struct list_head        cleanup_list;   /* namespaces on death row */
 60         struct list_head        exit_list;      /* Use only net_mutex */
 61 
 62         struct user_namespace   *user_ns;       /* Owning user namespace */
 63         spinlock_t              nsid_lock;
 64         struct idr              netns_ids;
 65 
 66         struct ns_common        ns;
 67 
 68         struct proc_dir_entry   *proc_net;
 69         struct proc_dir_entry   *proc_net_stat;
 70 
 71 #ifdef CONFIG_SYSCTL
 72         struct ctl_table_set    sysctls;
 73 #endif
 74 
 75         struct sock             *rtnl;                  /* rtnetlink socket */
 76         struct sock             *genl_sock;
 77 
 78         struct list_head        dev_base_head;
 79         struct hlist_head       *dev_name_head;
 80         struct hlist_head       *dev_index_head;
 81         unsigned int            dev_base_seq;   /* protected by rtnl_mutex */
 82         int                     ifindex;
 83         unsigned int            dev_unreg_count;
 84 
 85         /* core fib_rules */
 86         struct list_head        rules_ops;
 87 
 88 
 89         struct net_device       *loopback_dev;          /* The loopback */
 90         struct netns_core       core;
 91         struct netns_mib        mib;
 92         struct netns_packet     packet;
 93         struct netns_unix       unx;
 94         struct netns_ipv4       ipv4;
 95 #if IS_ENABLED(CONFIG_IPV6)
 96         struct netns_ipv6       ipv6;
 97 #endif
 98 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
 99         struct netns_ieee802154_lowpan  ieee802154_lowpan;
100 #endif
101 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
102         struct netns_sctp       sctp;
103 #endif
104 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
105         struct netns_dccp       dccp;
106 #endif
107 #ifdef CONFIG_NETFILTER
108         struct netns_nf         nf;
109         struct netns_xt         xt;
110 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
111         struct netns_ct         ct;
112 #endif
113 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
114         struct netns_nftables   nft;
115 #endif
116 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
117         struct netns_nf_frag    nf_frag;
118 #endif
119         struct sock             *nfnl;
120         struct sock             *nfnl_stash;
121 #if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT)
122         struct list_head        nfnl_acct_list;
123 #endif
124 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
125         struct list_head        nfct_timeout_list;
126 #endif
127 #endif
128 #ifdef CONFIG_WEXT_CORE
129         struct sk_buff_head     wext_nlevents;
130 #endif
131         struct net_generic __rcu        *gen;
132 
133         /* Note : following structs are cache line aligned */
134 #ifdef CONFIG_XFRM
135         struct netns_xfrm       xfrm;
136 #endif
137 #if IS_ENABLED(CONFIG_IP_VS)
138         struct netns_ipvs       *ipvs;
139 #endif
140 #if IS_ENABLED(CONFIG_MPLS)
141         struct netns_mpls       mpls;
142 #endif
143         struct sock             *diag_nlsk;
144         atomic_t                fnhe_genid;
145 };
146 
147 #include <linux/seq_file_net.h>
148 
149 /* Init's network namespace */
150 extern struct net init_net;
151 
152 #ifdef CONFIG_NET_NS
153 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
154                         struct net *old_net);
155 
156 #else /* CONFIG_NET_NS */
157 #include <linux/sched.h>
158 #include <linux/nsproxy.h>
159 static inline struct net *copy_net_ns(unsigned long flags,
160         struct user_namespace *user_ns, struct net *old_net)
161 {
162         if (flags & CLONE_NEWNET)
163                 return ERR_PTR(-EINVAL);
164         return old_net;
165 }
166 #endif /* CONFIG_NET_NS */
167 
168 
169 extern struct list_head net_namespace_list;
170 
171 struct net *get_net_ns_by_pid(pid_t pid);
172 struct net *get_net_ns_by_fd(int pid);
173 
174 #ifdef CONFIG_SYSCTL
175 void ipx_register_sysctl(void);
176 void ipx_unregister_sysctl(void);
177 #else
178 #define ipx_register_sysctl()
179 #define ipx_unregister_sysctl()
180 #endif
181 
182 #ifdef CONFIG_NET_NS
183 void __put_net(struct net *net);
184 
185 static inline struct net *get_net(struct net *net)
186 {
187         atomic_inc(&net->count);
188         return net;
189 }
190 
191 static inline struct net *maybe_get_net(struct net *net)
192 {
193         /* Used when we know struct net exists but we
194          * aren't guaranteed a previous reference count
195          * exists.  If the reference count is zero this
196          * function fails and returns NULL.
197          */
198         if (!atomic_inc_not_zero(&net->count))
199                 net = NULL;
200         return net;
201 }
202 
203 static inline void put_net(struct net *net)
204 {
205         if (atomic_dec_and_test(&net->count))
206                 __put_net(net);
207 }
208 
209 static inline
210 int net_eq(const struct net *net1, const struct net *net2)
211 {
212         return net1 == net2;
213 }
214 
215 void net_drop_ns(void *);
216 
217 #else
218 
219 static inline struct net *get_net(struct net *net)
220 {
221         return net;
222 }
223 
224 static inline void put_net(struct net *net)
225 {
226 }
227 
228 static inline struct net *maybe_get_net(struct net *net)
229 {
230         return net;
231 }
232 
233 static inline
234 int net_eq(const struct net *net1, const struct net *net2)
235 {
236         return 1;
237 }
238 
239 #define net_drop_ns NULL
240 #endif
241 
242 
243 typedef struct {
244 #ifdef CONFIG_NET_NS
245         struct net *net;
246 #endif
247 } possible_net_t;
248 
249 static inline void write_pnet(possible_net_t *pnet, struct net *net)
250 {
251 #ifdef CONFIG_NET_NS
252         pnet->net = net;
253 #endif
254 }
255 
256 static inline struct net *read_pnet(const possible_net_t *pnet)
257 {
258 #ifdef CONFIG_NET_NS
259         return pnet->net;
260 #else
261         return &init_net;
262 #endif
263 }
264 
265 #define for_each_net(VAR)                               \
266         list_for_each_entry(VAR, &net_namespace_list, list)
267 
268 #define for_each_net_rcu(VAR)                           \
269         list_for_each_entry_rcu(VAR, &net_namespace_list, list)
270 
271 #ifdef CONFIG_NET_NS
272 #define __net_init
273 #define __net_exit
274 #define __net_initdata
275 #define __net_initconst
276 #else
277 #define __net_init      __init
278 #define __net_exit      __exit_refok
279 #define __net_initdata  __initdata
280 #define __net_initconst __initconst
281 #endif
282 
283 int peernet2id_alloc(struct net *net, struct net *peer);
284 int peernet2id(struct net *net, struct net *peer);
285 bool peernet_has_id(struct net *net, struct net *peer);
286 struct net *get_net_ns_by_id(struct net *net, int id);
287 
288 struct pernet_operations {
289         struct list_head list;
290         int (*init)(struct net *net);
291         void (*exit)(struct net *net);
292         void (*exit_batch)(struct list_head *net_exit_list);
293         int *id;
294         size_t size;
295 };
296 
297 /*
298  * Use these carefully.  If you implement a network device and it
299  * needs per network namespace operations use device pernet operations,
300  * otherwise use pernet subsys operations.
301  *
302  * Network interfaces need to be removed from a dying netns _before_
303  * subsys notifiers can be called, as most of the network code cleanup
304  * (which is done from subsys notifiers) runs with the assumption that
305  * dev_remove_pack has been called so no new packets will arrive during
306  * and after the cleanup functions have been called.  dev_remove_pack
307  * is not per namespace so instead the guarantee of no more packets
308  * arriving in a network namespace is provided by ensuring that all
309  * network devices and all sockets have left the network namespace
310  * before the cleanup methods are called.
311  *
312  * For the longest time the ipv4 icmp code was registered as a pernet
313  * device which caused kernel oops, and panics during network
314  * namespace cleanup.   So please don't get this wrong.
315  */
316 int register_pernet_subsys(struct pernet_operations *);
317 void unregister_pernet_subsys(struct pernet_operations *);
318 int register_pernet_device(struct pernet_operations *);
319 void unregister_pernet_device(struct pernet_operations *);
320 
321 struct ctl_table;
322 struct ctl_table_header;
323 
324 #ifdef CONFIG_SYSCTL
325 int net_sysctl_init(void);
326 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
327                                              struct ctl_table *table);
328 void unregister_net_sysctl_table(struct ctl_table_header *header);
329 #else
330 static inline int net_sysctl_init(void) { return 0; }
331 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
332         const char *path, struct ctl_table *table)
333 {
334         return NULL;
335 }
336 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
337 {
338 }
339 #endif
340 
341 static inline int rt_genid_ipv4(struct net *net)
342 {
343         return atomic_read(&net->ipv4.rt_genid);
344 }
345 
346 static inline void rt_genid_bump_ipv4(struct net *net)
347 {
348         atomic_inc(&net->ipv4.rt_genid);
349 }
350 
351 extern void (*__fib6_flush_trees)(struct net *net);
352 static inline void rt_genid_bump_ipv6(struct net *net)
353 {
354         if (__fib6_flush_trees)
355                 __fib6_flush_trees(net);
356 }
357 
358 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
359 static inline struct netns_ieee802154_lowpan *
360 net_ieee802154_lowpan(struct net *net)
361 {
362         return &net->ieee802154_lowpan;
363 }
364 #endif
365 
366 /* For callers who don't really care about whether it's IPv4 or IPv6 */
367 static inline void rt_genid_bump_all(struct net *net)
368 {
369         rt_genid_bump_ipv4(net);
370         rt_genid_bump_ipv6(net);
371 }
372 
373 static inline int fnhe_genid(struct net *net)
374 {
375         return atomic_read(&net->fnhe_genid);
376 }
377 
378 static inline void fnhe_genid_bump(struct net *net)
379 {
380         atomic_inc(&net->fnhe_genid);
381 }
382 
383 #endif /* __NET_NET_NAMESPACE_H */
384 

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