Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 1 | #include <linux/workqueue.h> |
| 2 | #include <linux/rtnetlink.h> |
| 3 | #include <linux/cache.h> |
| 4 | #include <linux/slab.h> |
| 5 | #include <linux/list.h> |
| 6 | #include <linux/delay.h> |
Eric W. Biederman | 9dd776b | 2007-09-26 22:04:26 -0700 | [diff] [blame] | 7 | #include <linux/sched.h> |
Pavel Emelyanov | c93cf61 | 2008-04-15 00:35:23 -0700 | [diff] [blame] | 8 | #include <linux/idr.h> |
Johannes Berg | 11a28d3 | 2009-07-10 09:51:33 +0000 | [diff] [blame] | 9 | #include <linux/rculist.h> |
Johannes Berg | 30ffee8 | 2009-07-10 09:51:35 +0000 | [diff] [blame] | 10 | #include <linux/nsproxy.h> |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 11 | #include <net/net_namespace.h> |
Pavel Emelyanov | dec827d | 2008-04-15 00:36:08 -0700 | [diff] [blame] | 12 | #include <net/netns/generic.h> |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 13 | |
| 14 | /* |
| 15 | * Our network namespace constructor/destructor lists |
| 16 | */ |
| 17 | |
| 18 | static LIST_HEAD(pernet_list); |
| 19 | static struct list_head *first_device = &pernet_list; |
| 20 | static DEFINE_MUTEX(net_mutex); |
| 21 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 22 | LIST_HEAD(net_namespace_list); |
Alexey Dobriyan | b76a461 | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 23 | EXPORT_SYMBOL_GPL(net_namespace_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 24 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 25 | struct net init_net; |
Denis V. Lunev | ff4b950 | 2008-01-22 22:05:33 -0800 | [diff] [blame] | 26 | EXPORT_SYMBOL(init_net); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 27 | |
Pavel Emelyanov | dec827d | 2008-04-15 00:36:08 -0700 | [diff] [blame] | 28 | #define INITIAL_NET_GEN_PTRS 13 /* +1 for len +2 for rcu_head */ |
| 29 | |
Jiri Pirko | 05fceb4 | 2010-04-23 01:40:47 +0000 | [diff] [blame] | 30 | static int net_assign_generic(struct net *net, int id, void *data) |
| 31 | { |
| 32 | struct net_generic *ng, *old_ng; |
| 33 | |
| 34 | BUG_ON(!mutex_is_locked(&net_mutex)); |
| 35 | BUG_ON(id == 0); |
| 36 | |
Eric Dumazet | 1c87733 | 2010-10-25 03:20:11 +0000 | [diff] [blame] | 37 | old_ng = rcu_dereference_protected(net->gen, |
| 38 | lockdep_is_held(&net_mutex)); |
| 39 | ng = old_ng; |
Jiri Pirko | 05fceb4 | 2010-04-23 01:40:47 +0000 | [diff] [blame] | 40 | if (old_ng->len >= id) |
| 41 | goto assign; |
| 42 | |
| 43 | ng = kzalloc(sizeof(struct net_generic) + |
| 44 | id * sizeof(void *), GFP_KERNEL); |
| 45 | if (ng == NULL) |
| 46 | return -ENOMEM; |
| 47 | |
| 48 | /* |
| 49 | * Some synchronisation notes: |
| 50 | * |
| 51 | * The net_generic explores the net->gen array inside rcu |
| 52 | * read section. Besides once set the net->gen->ptr[x] |
| 53 | * pointer never changes (see rules in netns/generic.h). |
| 54 | * |
| 55 | * That said, we simply duplicate this array and schedule |
| 56 | * the old copy for kfree after a grace period. |
| 57 | */ |
| 58 | |
| 59 | ng->len = id; |
| 60 | memcpy(&ng->ptr, &old_ng->ptr, old_ng->len * sizeof(void*)); |
| 61 | |
| 62 | rcu_assign_pointer(net->gen, ng); |
Lai Jiangshan | 04d4dfe | 2011-03-18 12:06:32 +0800 | [diff] [blame] | 63 | kfree_rcu(old_ng, rcu); |
Jiri Pirko | 05fceb4 | 2010-04-23 01:40:47 +0000 | [diff] [blame] | 64 | assign: |
| 65 | ng->ptr[id - 1] = data; |
| 66 | return 0; |
| 67 | } |
| 68 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 69 | static int ops_init(const struct pernet_operations *ops, struct net *net) |
| 70 | { |
| 71 | int err; |
| 72 | if (ops->id && ops->size) { |
| 73 | void *data = kzalloc(ops->size, GFP_KERNEL); |
| 74 | if (!data) |
| 75 | return -ENOMEM; |
| 76 | |
| 77 | err = net_assign_generic(net, *ops->id, data); |
| 78 | if (err) { |
| 79 | kfree(data); |
| 80 | return err; |
| 81 | } |
| 82 | } |
| 83 | if (ops->init) |
| 84 | return ops->init(net); |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | static void ops_free(const struct pernet_operations *ops, struct net *net) |
| 89 | { |
| 90 | if (ops->id && ops->size) { |
| 91 | int id = *ops->id; |
| 92 | kfree(net_generic(net, id)); |
| 93 | } |
| 94 | } |
| 95 | |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 96 | static void ops_exit_list(const struct pernet_operations *ops, |
| 97 | struct list_head *net_exit_list) |
| 98 | { |
| 99 | struct net *net; |
| 100 | if (ops->exit) { |
| 101 | list_for_each_entry(net, net_exit_list, exit_list) |
| 102 | ops->exit(net); |
| 103 | } |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 104 | if (ops->exit_batch) |
| 105 | ops->exit_batch(net_exit_list); |
| 106 | } |
| 107 | |
| 108 | static void ops_free_list(const struct pernet_operations *ops, |
| 109 | struct list_head *net_exit_list) |
| 110 | { |
| 111 | struct net *net; |
| 112 | if (ops->size && ops->id) { |
| 113 | list_for_each_entry(net, net_exit_list, exit_list) |
| 114 | ops_free(ops, net); |
| 115 | } |
| 116 | } |
| 117 | |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 118 | /* |
| 119 | * setup_net runs the initializers for the network namespace object. |
| 120 | */ |
Pavel Emelyanov | 1a2ee93 | 2007-11-01 00:45:59 -0700 | [diff] [blame] | 121 | static __net_init int setup_net(struct net *net) |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 122 | { |
| 123 | /* Must be called with net_mutex held */ |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 124 | const struct pernet_operations *ops, *saved_ops; |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 125 | int error = 0; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 126 | LIST_HEAD(net_exit_list); |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 127 | |
| 128 | atomic_set(&net->count, 1); |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 129 | |
Denis V. Lunev | 5d1e446 | 2008-04-16 01:58:04 -0700 | [diff] [blame] | 130 | #ifdef NETNS_REFCNT_DEBUG |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 131 | atomic_set(&net->use_count, 0); |
Denis V. Lunev | 5d1e446 | 2008-04-16 01:58:04 -0700 | [diff] [blame] | 132 | #endif |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 133 | |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 134 | list_for_each_entry(ops, &pernet_list, list) { |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 135 | error = ops_init(ops, net); |
| 136 | if (error < 0) |
| 137 | goto out_undo; |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 138 | } |
| 139 | out: |
| 140 | return error; |
| 141 | |
| 142 | out_undo: |
| 143 | /* Walk through the list backwards calling the exit functions |
| 144 | * for the pernet modules whose init functions did not fail. |
| 145 | */ |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 146 | list_add(&net->exit_list, &net_exit_list); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 147 | saved_ops = ops; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 148 | list_for_each_entry_continue_reverse(ops, &pernet_list, list) |
| 149 | ops_exit_list(ops, &net_exit_list); |
| 150 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 151 | ops = saved_ops; |
| 152 | list_for_each_entry_continue_reverse(ops, &pernet_list, list) |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 153 | ops_free_list(ops, &net_exit_list); |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 154 | |
| 155 | rcu_barrier(); |
| 156 | goto out; |
| 157 | } |
| 158 | |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 159 | static struct net_generic *net_alloc_generic(void) |
| 160 | { |
| 161 | struct net_generic *ng; |
| 162 | size_t generic_size = sizeof(struct net_generic) + |
| 163 | INITIAL_NET_GEN_PTRS * sizeof(void *); |
| 164 | |
| 165 | ng = kzalloc(generic_size, GFP_KERNEL); |
| 166 | if (ng) |
| 167 | ng->len = INITIAL_NET_GEN_PTRS; |
| 168 | |
| 169 | return ng; |
| 170 | } |
| 171 | |
Clemens Noss | ebe47d4 | 2009-02-23 15:37:35 -0800 | [diff] [blame] | 172 | #ifdef CONFIG_NET_NS |
| 173 | static struct kmem_cache *net_cachep; |
| 174 | static struct workqueue_struct *netns_wq; |
| 175 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 176 | static struct net *net_alloc(void) |
| 177 | { |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 178 | struct net *net = NULL; |
| 179 | struct net_generic *ng; |
| 180 | |
| 181 | ng = net_alloc_generic(); |
| 182 | if (!ng) |
| 183 | goto out; |
| 184 | |
| 185 | net = kmem_cache_zalloc(net_cachep, GFP_KERNEL); |
| 186 | if (!net) |
| 187 | goto out_free; |
| 188 | |
| 189 | rcu_assign_pointer(net->gen, ng); |
| 190 | out: |
| 191 | return net; |
| 192 | |
| 193 | out_free: |
| 194 | kfree(ng); |
| 195 | goto out; |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 196 | } |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 197 | |
Johann Felix Soden | 45a19b0 | 2007-11-07 01:30:30 -0800 | [diff] [blame] | 198 | static void net_free(struct net *net) |
| 199 | { |
Denis V. Lunev | 5d1e446 | 2008-04-16 01:58:04 -0700 | [diff] [blame] | 200 | #ifdef NETNS_REFCNT_DEBUG |
Johann Felix Soden | 45a19b0 | 2007-11-07 01:30:30 -0800 | [diff] [blame] | 201 | if (unlikely(atomic_read(&net->use_count) != 0)) { |
| 202 | printk(KERN_EMERG "network namespace not free! Usage: %d\n", |
| 203 | atomic_read(&net->use_count)); |
| 204 | return; |
| 205 | } |
Denis V. Lunev | 5d1e446 | 2008-04-16 01:58:04 -0700 | [diff] [blame] | 206 | #endif |
Alexey Dobriyan | 4ef079c | 2008-10-14 22:54:48 -0700 | [diff] [blame] | 207 | kfree(net->gen); |
Johann Felix Soden | 45a19b0 | 2007-11-07 01:30:30 -0800 | [diff] [blame] | 208 | kmem_cache_free(net_cachep, net); |
| 209 | } |
| 210 | |
Rob Landley | 911cb19 | 2011-04-15 02:26:25 +0000 | [diff] [blame] | 211 | struct net *copy_net_ns(unsigned long flags, struct net *old_net) |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 212 | { |
Alexey Dobriyan | 088eb2d | 2009-05-04 11:12:14 -0700 | [diff] [blame] | 213 | struct net *net; |
| 214 | int rv; |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 215 | |
Rob Landley | 911cb19 | 2011-04-15 02:26:25 +0000 | [diff] [blame] | 216 | if (!(flags & CLONE_NEWNET)) |
| 217 | return get_net(old_net); |
| 218 | |
Alexey Dobriyan | 088eb2d | 2009-05-04 11:12:14 -0700 | [diff] [blame] | 219 | net = net_alloc(); |
| 220 | if (!net) |
| 221 | return ERR_PTR(-ENOMEM); |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 222 | mutex_lock(&net_mutex); |
Alexey Dobriyan | 088eb2d | 2009-05-04 11:12:14 -0700 | [diff] [blame] | 223 | rv = setup_net(net); |
| 224 | if (rv == 0) { |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 225 | rtnl_lock(); |
Johannes Berg | 11a28d3 | 2009-07-10 09:51:33 +0000 | [diff] [blame] | 226 | list_add_tail_rcu(&net->list, &net_namespace_list); |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 227 | rtnl_unlock(); |
| 228 | } |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 229 | mutex_unlock(&net_mutex); |
Alexey Dobriyan | 088eb2d | 2009-05-04 11:12:14 -0700 | [diff] [blame] | 230 | if (rv < 0) { |
| 231 | net_free(net); |
| 232 | return ERR_PTR(rv); |
| 233 | } |
| 234 | return net; |
| 235 | } |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 236 | |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 237 | static DEFINE_SPINLOCK(cleanup_list_lock); |
| 238 | static LIST_HEAD(cleanup_list); /* Must hold cleanup_list_lock to touch */ |
| 239 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 240 | static void cleanup_net(struct work_struct *work) |
| 241 | { |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 242 | const struct pernet_operations *ops; |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 243 | struct net *net, *tmp; |
| 244 | LIST_HEAD(net_kill_list); |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 245 | LIST_HEAD(net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 246 | |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 247 | /* Atomically snapshot the list of namespaces to cleanup */ |
| 248 | spin_lock_irq(&cleanup_list_lock); |
| 249 | list_replace_init(&cleanup_list, &net_kill_list); |
| 250 | spin_unlock_irq(&cleanup_list_lock); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 251 | |
| 252 | mutex_lock(&net_mutex); |
| 253 | |
| 254 | /* Don't let anyone else find us. */ |
Eric W. Biederman | f4618d3 | 2007-09-26 22:40:08 -0700 | [diff] [blame] | 255 | rtnl_lock(); |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 256 | list_for_each_entry(net, &net_kill_list, cleanup_list) { |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 257 | list_del_rcu(&net->list); |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 258 | list_add_tail(&net->exit_list, &net_exit_list); |
| 259 | } |
Eric W. Biederman | f4618d3 | 2007-09-26 22:40:08 -0700 | [diff] [blame] | 260 | rtnl_unlock(); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 261 | |
Johannes Berg | 11a28d3 | 2009-07-10 09:51:33 +0000 | [diff] [blame] | 262 | /* |
| 263 | * Another CPU might be rcu-iterating the list, wait for it. |
| 264 | * This needs to be before calling the exit() notifiers, so |
| 265 | * the rcu_barrier() below isn't sufficient alone. |
| 266 | */ |
| 267 | synchronize_rcu(); |
| 268 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 269 | /* Run all of the network namespace exit methods */ |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 270 | list_for_each_entry_reverse(ops, &pernet_list, list) |
| 271 | ops_exit_list(ops, &net_exit_list); |
| 272 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 273 | /* Free the net generic variables */ |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 274 | list_for_each_entry_reverse(ops, &pernet_list, list) |
| 275 | ops_free_list(ops, &net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 276 | |
| 277 | mutex_unlock(&net_mutex); |
| 278 | |
| 279 | /* Ensure there are no outstanding rcu callbacks using this |
| 280 | * network namespace. |
| 281 | */ |
| 282 | rcu_barrier(); |
| 283 | |
| 284 | /* Finally it is safe to free my network namespace structure */ |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 285 | list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) { |
| 286 | list_del_init(&net->exit_list); |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 287 | net_free(net); |
| 288 | } |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 289 | } |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 290 | static DECLARE_WORK(net_cleanup_work, cleanup_net); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 291 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 292 | void __put_net(struct net *net) |
| 293 | { |
| 294 | /* Cleanup the network namespace in process context */ |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 295 | unsigned long flags; |
| 296 | |
| 297 | spin_lock_irqsave(&cleanup_list_lock, flags); |
| 298 | list_add(&net->cleanup_list, &cleanup_list); |
| 299 | spin_unlock_irqrestore(&cleanup_list_lock, flags); |
| 300 | |
| 301 | queue_work(netns_wq, &net_cleanup_work); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 302 | } |
| 303 | EXPORT_SYMBOL_GPL(__put_net); |
| 304 | |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 305 | #else |
Eric W. Biederman | 9dd776b | 2007-09-26 22:04:26 -0700 | [diff] [blame] | 306 | struct net *copy_net_ns(unsigned long flags, struct net *old_net) |
| 307 | { |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 308 | if (flags & CLONE_NEWNET) |
| 309 | return ERR_PTR(-EINVAL); |
| 310 | return old_net; |
Eric W. Biederman | 9dd776b | 2007-09-26 22:04:26 -0700 | [diff] [blame] | 311 | } |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 312 | #endif |
Eric W. Biederman | 9dd776b | 2007-09-26 22:04:26 -0700 | [diff] [blame] | 313 | |
Johannes Berg | 30ffee8 | 2009-07-10 09:51:35 +0000 | [diff] [blame] | 314 | struct net *get_net_ns_by_pid(pid_t pid) |
| 315 | { |
| 316 | struct task_struct *tsk; |
| 317 | struct net *net; |
| 318 | |
| 319 | /* Lookup the network namespace */ |
| 320 | net = ERR_PTR(-ESRCH); |
| 321 | rcu_read_lock(); |
| 322 | tsk = find_task_by_vpid(pid); |
| 323 | if (tsk) { |
| 324 | struct nsproxy *nsproxy; |
| 325 | nsproxy = task_nsproxy(tsk); |
| 326 | if (nsproxy) |
| 327 | net = get_net(nsproxy->net_ns); |
| 328 | } |
| 329 | rcu_read_unlock(); |
| 330 | return net; |
| 331 | } |
| 332 | EXPORT_SYMBOL_GPL(get_net_ns_by_pid); |
| 333 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 334 | static int __init net_ns_init(void) |
| 335 | { |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 336 | struct net_generic *ng; |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 337 | |
Pavel Emelyanov | d57a921 | 2007-11-01 00:46:50 -0700 | [diff] [blame] | 338 | #ifdef CONFIG_NET_NS |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 339 | net_cachep = kmem_cache_create("net_namespace", sizeof(struct net), |
| 340 | SMP_CACHE_BYTES, |
| 341 | SLAB_PANIC, NULL); |
Benjamin Thery | 3ef1355 | 2007-11-19 23:18:16 -0800 | [diff] [blame] | 342 | |
| 343 | /* Create workqueue for cleanup */ |
| 344 | netns_wq = create_singlethread_workqueue("netns"); |
| 345 | if (!netns_wq) |
| 346 | panic("Could not create netns workq"); |
Pavel Emelyanov | d57a921 | 2007-11-01 00:46:50 -0700 | [diff] [blame] | 347 | #endif |
Benjamin Thery | 3ef1355 | 2007-11-19 23:18:16 -0800 | [diff] [blame] | 348 | |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 349 | ng = net_alloc_generic(); |
| 350 | if (!ng) |
| 351 | panic("Could not allocate generic netns"); |
| 352 | |
| 353 | rcu_assign_pointer(init_net.gen, ng); |
| 354 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 355 | mutex_lock(&net_mutex); |
Stephen Hemminger | ca0f311 | 2009-05-21 15:10:31 -0700 | [diff] [blame] | 356 | if (setup_net(&init_net)) |
| 357 | panic("Could not setup the initial network namespace"); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 358 | |
Eric W. Biederman | f4618d3 | 2007-09-26 22:40:08 -0700 | [diff] [blame] | 359 | rtnl_lock(); |
Johannes Berg | 11a28d3 | 2009-07-10 09:51:33 +0000 | [diff] [blame] | 360 | list_add_tail_rcu(&init_net.list, &net_namespace_list); |
Eric W. Biederman | f4618d3 | 2007-09-26 22:40:08 -0700 | [diff] [blame] | 361 | rtnl_unlock(); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 362 | |
| 363 | mutex_unlock(&net_mutex); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 364 | |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | pure_initcall(net_ns_init); |
| 369 | |
Denis V. Lunev | ed160e8 | 2007-11-13 03:23:21 -0800 | [diff] [blame] | 370 | #ifdef CONFIG_NET_NS |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 371 | static int __register_pernet_operations(struct list_head *list, |
| 372 | struct pernet_operations *ops) |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 373 | { |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 374 | struct net *net; |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 375 | int error; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 376 | LIST_HEAD(net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 377 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 378 | list_add_tail(&ops->list, list); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 379 | if (ops->init || (ops->id && ops->size)) { |
Pavel Emelyanov | 1dba323 | 2007-11-01 00:42:43 -0700 | [diff] [blame] | 380 | for_each_net(net) { |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 381 | error = ops_init(ops, net); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 382 | if (error) |
| 383 | goto out_undo; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 384 | list_add_tail(&net->exit_list, &net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 385 | } |
| 386 | } |
Pavel Emelyanov | 1dba323 | 2007-11-01 00:42:43 -0700 | [diff] [blame] | 387 | return 0; |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 388 | |
| 389 | out_undo: |
| 390 | /* If I have an error cleanup all namespaces I initialized */ |
| 391 | list_del(&ops->list); |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 392 | ops_exit_list(ops, &net_exit_list); |
| 393 | ops_free_list(ops, &net_exit_list); |
Pavel Emelyanov | 1dba323 | 2007-11-01 00:42:43 -0700 | [diff] [blame] | 394 | return error; |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 395 | } |
| 396 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 397 | static void __unregister_pernet_operations(struct pernet_operations *ops) |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 398 | { |
| 399 | struct net *net; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 400 | LIST_HEAD(net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 401 | |
| 402 | list_del(&ops->list); |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 403 | for_each_net(net) |
| 404 | list_add_tail(&net->exit_list, &net_exit_list); |
| 405 | ops_exit_list(ops, &net_exit_list); |
| 406 | ops_free_list(ops, &net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 407 | } |
| 408 | |
Denis V. Lunev | ed160e8 | 2007-11-13 03:23:21 -0800 | [diff] [blame] | 409 | #else |
| 410 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 411 | static int __register_pernet_operations(struct list_head *list, |
| 412 | struct pernet_operations *ops) |
| 413 | { |
| 414 | int err = 0; |
| 415 | err = ops_init(ops, &init_net); |
| 416 | if (err) |
| 417 | ops_free(ops, &init_net); |
| 418 | return err; |
| 419 | |
| 420 | } |
| 421 | |
| 422 | static void __unregister_pernet_operations(struct pernet_operations *ops) |
| 423 | { |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 424 | LIST_HEAD(net_exit_list); |
| 425 | list_add(&init_net.exit_list, &net_exit_list); |
| 426 | ops_exit_list(ops, &net_exit_list); |
| 427 | ops_free_list(ops, &net_exit_list); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 428 | } |
| 429 | |
| 430 | #endif /* CONFIG_NET_NS */ |
| 431 | |
| 432 | static DEFINE_IDA(net_generic_ids); |
| 433 | |
Denis V. Lunev | ed160e8 | 2007-11-13 03:23:21 -0800 | [diff] [blame] | 434 | static int register_pernet_operations(struct list_head *list, |
| 435 | struct pernet_operations *ops) |
| 436 | { |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 437 | int error; |
| 438 | |
| 439 | if (ops->id) { |
| 440 | again: |
| 441 | error = ida_get_new_above(&net_generic_ids, 1, ops->id); |
| 442 | if (error < 0) { |
| 443 | if (error == -EAGAIN) { |
| 444 | ida_pre_get(&net_generic_ids, GFP_KERNEL); |
| 445 | goto again; |
| 446 | } |
| 447 | return error; |
| 448 | } |
| 449 | } |
| 450 | error = __register_pernet_operations(list, ops); |
Eric W. Biederman | 3a765ed | 2009-12-03 02:29:06 +0000 | [diff] [blame] | 451 | if (error) { |
| 452 | rcu_barrier(); |
| 453 | if (ops->id) |
| 454 | ida_remove(&net_generic_ids, *ops->id); |
| 455 | } |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 456 | |
| 457 | return error; |
Denis V. Lunev | ed160e8 | 2007-11-13 03:23:21 -0800 | [diff] [blame] | 458 | } |
| 459 | |
| 460 | static void unregister_pernet_operations(struct pernet_operations *ops) |
| 461 | { |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 462 | |
| 463 | __unregister_pernet_operations(ops); |
Eric W. Biederman | 3a765ed | 2009-12-03 02:29:06 +0000 | [diff] [blame] | 464 | rcu_barrier(); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 465 | if (ops->id) |
| 466 | ida_remove(&net_generic_ids, *ops->id); |
Denis V. Lunev | ed160e8 | 2007-11-13 03:23:21 -0800 | [diff] [blame] | 467 | } |
Pavel Emelyanov | c93cf61 | 2008-04-15 00:35:23 -0700 | [diff] [blame] | 468 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 469 | /** |
| 470 | * register_pernet_subsys - register a network namespace subsystem |
| 471 | * @ops: pernet operations structure for the subsystem |
| 472 | * |
| 473 | * Register a subsystem which has init and exit functions |
| 474 | * that are called when network namespaces are created and |
| 475 | * destroyed respectively. |
| 476 | * |
| 477 | * When registered all network namespace init functions are |
| 478 | * called for every existing network namespace. Allowing kernel |
| 479 | * modules to have a race free view of the set of network namespaces. |
| 480 | * |
| 481 | * When a new network namespace is created all of the init |
| 482 | * methods are called in the order in which they were registered. |
| 483 | * |
| 484 | * When a network namespace is destroyed all of the exit methods |
| 485 | * are called in the reverse of the order with which they were |
| 486 | * registered. |
| 487 | */ |
| 488 | int register_pernet_subsys(struct pernet_operations *ops) |
| 489 | { |
| 490 | int error; |
| 491 | mutex_lock(&net_mutex); |
| 492 | error = register_pernet_operations(first_device, ops); |
| 493 | mutex_unlock(&net_mutex); |
| 494 | return error; |
| 495 | } |
| 496 | EXPORT_SYMBOL_GPL(register_pernet_subsys); |
| 497 | |
| 498 | /** |
| 499 | * unregister_pernet_subsys - unregister a network namespace subsystem |
| 500 | * @ops: pernet operations structure to manipulate |
| 501 | * |
| 502 | * Remove the pernet operations structure from the list to be |
Oliver Pinter | 53379e5 | 2008-02-03 17:56:48 +0200 | [diff] [blame] | 503 | * used when network namespaces are created or destroyed. In |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 504 | * addition run the exit method for all existing network |
| 505 | * namespaces. |
| 506 | */ |
Jiri Pirko | b3c981d | 2010-04-25 00:49:56 -0700 | [diff] [blame] | 507 | void unregister_pernet_subsys(struct pernet_operations *ops) |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 508 | { |
| 509 | mutex_lock(&net_mutex); |
Jiri Pirko | b3c981d | 2010-04-25 00:49:56 -0700 | [diff] [blame] | 510 | unregister_pernet_operations(ops); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 511 | mutex_unlock(&net_mutex); |
| 512 | } |
| 513 | EXPORT_SYMBOL_GPL(unregister_pernet_subsys); |
| 514 | |
| 515 | /** |
| 516 | * register_pernet_device - register a network namespace device |
| 517 | * @ops: pernet operations structure for the subsystem |
| 518 | * |
| 519 | * Register a device which has init and exit functions |
| 520 | * that are called when network namespaces are created and |
| 521 | * destroyed respectively. |
| 522 | * |
| 523 | * When registered all network namespace init functions are |
| 524 | * called for every existing network namespace. Allowing kernel |
| 525 | * modules to have a race free view of the set of network namespaces. |
| 526 | * |
| 527 | * When a new network namespace is created all of the init |
| 528 | * methods are called in the order in which they were registered. |
| 529 | * |
| 530 | * When a network namespace is destroyed all of the exit methods |
| 531 | * are called in the reverse of the order with which they were |
| 532 | * registered. |
| 533 | */ |
| 534 | int register_pernet_device(struct pernet_operations *ops) |
| 535 | { |
| 536 | int error; |
| 537 | mutex_lock(&net_mutex); |
| 538 | error = register_pernet_operations(&pernet_list, ops); |
| 539 | if (!error && (first_device == &pernet_list)) |
| 540 | first_device = &ops->list; |
| 541 | mutex_unlock(&net_mutex); |
| 542 | return error; |
| 543 | } |
| 544 | EXPORT_SYMBOL_GPL(register_pernet_device); |
| 545 | |
| 546 | /** |
| 547 | * unregister_pernet_device - unregister a network namespace netdevice |
| 548 | * @ops: pernet operations structure to manipulate |
| 549 | * |
| 550 | * Remove the pernet operations structure from the list to be |
Oliver Pinter | 53379e5 | 2008-02-03 17:56:48 +0200 | [diff] [blame] | 551 | * used when network namespaces are created or destroyed. In |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 552 | * addition run the exit method for all existing network |
| 553 | * namespaces. |
| 554 | */ |
| 555 | void unregister_pernet_device(struct pernet_operations *ops) |
| 556 | { |
| 557 | mutex_lock(&net_mutex); |
| 558 | if (&ops->list == first_device) |
| 559 | first_device = first_device->next; |
| 560 | unregister_pernet_operations(ops); |
| 561 | mutex_unlock(&net_mutex); |
| 562 | } |
| 563 | EXPORT_SYMBOL_GPL(unregister_pernet_device); |