Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 1 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 2 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 3 | #include <linux/workqueue.h> |
| 4 | #include <linux/rtnetlink.h> |
| 5 | #include <linux/cache.h> |
| 6 | #include <linux/slab.h> |
| 7 | #include <linux/list.h> |
| 8 | #include <linux/delay.h> |
Eric W. Biederman | 9dd776b | 2007-09-26 22:04:26 -0700 | [diff] [blame] | 9 | #include <linux/sched.h> |
Pavel Emelyanov | c93cf61 | 2008-04-15 00:35:23 -0700 | [diff] [blame] | 10 | #include <linux/idr.h> |
Johannes Berg | 11a28d3 | 2009-07-10 09:51:33 +0000 | [diff] [blame] | 11 | #include <linux/rculist.h> |
Johannes Berg | 30ffee8 | 2009-07-10 09:51:35 +0000 | [diff] [blame] | 12 | #include <linux/nsproxy.h> |
David Howells | 0bb80f2 | 2013-04-12 01:50:06 +0100 | [diff] [blame] | 13 | #include <linux/fs.h> |
| 14 | #include <linux/proc_ns.h> |
Eric W. Biederman | f063052 | 2011-05-04 17:51:50 -0700 | [diff] [blame] | 15 | #include <linux/file.h> |
Paul Gortmaker | bc3b2d7 | 2011-07-15 11:47:34 -0400 | [diff] [blame] | 16 | #include <linux/export.h> |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 17 | #include <linux/user_namespace.h> |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 18 | #include <linux/net_namespace.h> |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 19 | #include <net/sock.h> |
| 20 | #include <net/netlink.h> |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 21 | #include <net/net_namespace.h> |
Pavel Emelyanov | dec827d | 2008-04-15 00:36:08 -0700 | [diff] [blame] | 22 | #include <net/netns/generic.h> |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 23 | |
| 24 | /* |
| 25 | * Our network namespace constructor/destructor lists |
| 26 | */ |
| 27 | |
| 28 | static LIST_HEAD(pernet_list); |
| 29 | static struct list_head *first_device = &pernet_list; |
Cong Wang | 200b916 | 2014-05-12 15:11:20 -0700 | [diff] [blame] | 30 | DEFINE_MUTEX(net_mutex); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 31 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 32 | LIST_HEAD(net_namespace_list); |
Alexey Dobriyan | b76a461 | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 33 | EXPORT_SYMBOL_GPL(net_namespace_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 34 | |
Rustad, Mark D | 734b654 | 2012-07-18 09:06:07 +0000 | [diff] [blame] | 35 | struct net init_net = { |
| 36 | .dev_base_head = LIST_HEAD_INIT(init_net.dev_base_head), |
| 37 | }; |
Denis V. Lunev | ff4b950 | 2008-01-22 22:05:33 -0800 | [diff] [blame] | 38 | EXPORT_SYMBOL(init_net); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 39 | |
Dmitry Torokhov | f8c46cb | 2016-08-10 14:36:00 -0700 | [diff] [blame] | 40 | static bool init_net_initialized; |
| 41 | |
Pavel Emelyanov | dec827d | 2008-04-15 00:36:08 -0700 | [diff] [blame] | 42 | #define INITIAL_NET_GEN_PTRS 13 /* +1 for len +2 for rcu_head */ |
| 43 | |
Eric Dumazet | 073862b | 2012-01-26 00:41:38 +0000 | [diff] [blame] | 44 | static unsigned int max_gen_ptrs = INITIAL_NET_GEN_PTRS; |
| 45 | |
| 46 | static struct net_generic *net_alloc_generic(void) |
| 47 | { |
| 48 | struct net_generic *ng; |
| 49 | size_t generic_size = offsetof(struct net_generic, ptr[max_gen_ptrs]); |
| 50 | |
| 51 | ng = kzalloc(generic_size, GFP_KERNEL); |
| 52 | if (ng) |
| 53 | ng->len = max_gen_ptrs; |
| 54 | |
| 55 | return ng; |
| 56 | } |
| 57 | |
Jiri Pirko | 05fceb4 | 2010-04-23 01:40:47 +0000 | [diff] [blame] | 58 | static int net_assign_generic(struct net *net, int id, void *data) |
| 59 | { |
| 60 | struct net_generic *ng, *old_ng; |
| 61 | |
| 62 | BUG_ON(!mutex_is_locked(&net_mutex)); |
| 63 | BUG_ON(id == 0); |
| 64 | |
Eric Dumazet | 1c87733 | 2010-10-25 03:20:11 +0000 | [diff] [blame] | 65 | old_ng = rcu_dereference_protected(net->gen, |
| 66 | lockdep_is_held(&net_mutex)); |
| 67 | ng = old_ng; |
Jiri Pirko | 05fceb4 | 2010-04-23 01:40:47 +0000 | [diff] [blame] | 68 | if (old_ng->len >= id) |
| 69 | goto assign; |
| 70 | |
Eric Dumazet | 073862b | 2012-01-26 00:41:38 +0000 | [diff] [blame] | 71 | ng = net_alloc_generic(); |
Jiri Pirko | 05fceb4 | 2010-04-23 01:40:47 +0000 | [diff] [blame] | 72 | if (ng == NULL) |
| 73 | return -ENOMEM; |
| 74 | |
| 75 | /* |
| 76 | * Some synchronisation notes: |
| 77 | * |
| 78 | * The net_generic explores the net->gen array inside rcu |
| 79 | * read section. Besides once set the net->gen->ptr[x] |
| 80 | * pointer never changes (see rules in netns/generic.h). |
| 81 | * |
| 82 | * That said, we simply duplicate this array and schedule |
| 83 | * the old copy for kfree after a grace period. |
| 84 | */ |
| 85 | |
Jiri Pirko | 05fceb4 | 2010-04-23 01:40:47 +0000 | [diff] [blame] | 86 | memcpy(&ng->ptr, &old_ng->ptr, old_ng->len * sizeof(void*)); |
| 87 | |
| 88 | rcu_assign_pointer(net->gen, ng); |
Lai Jiangshan | 04d4dfe | 2011-03-18 12:06:32 +0800 | [diff] [blame] | 89 | kfree_rcu(old_ng, rcu); |
Jiri Pirko | 05fceb4 | 2010-04-23 01:40:47 +0000 | [diff] [blame] | 90 | assign: |
| 91 | ng->ptr[id - 1] = data; |
| 92 | return 0; |
| 93 | } |
| 94 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 95 | static int ops_init(const struct pernet_operations *ops, struct net *net) |
| 96 | { |
Julian Anastasov | b922934 | 2012-04-16 04:43:15 +0000 | [diff] [blame] | 97 | int err = -ENOMEM; |
| 98 | void *data = NULL; |
| 99 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 100 | if (ops->id && ops->size) { |
Julian Anastasov | b922934 | 2012-04-16 04:43:15 +0000 | [diff] [blame] | 101 | data = kzalloc(ops->size, GFP_KERNEL); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 102 | if (!data) |
Julian Anastasov | b922934 | 2012-04-16 04:43:15 +0000 | [diff] [blame] | 103 | goto out; |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 104 | |
| 105 | err = net_assign_generic(net, *ops->id, data); |
Julian Anastasov | b922934 | 2012-04-16 04:43:15 +0000 | [diff] [blame] | 106 | if (err) |
| 107 | goto cleanup; |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 108 | } |
Julian Anastasov | b922934 | 2012-04-16 04:43:15 +0000 | [diff] [blame] | 109 | err = 0; |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 110 | if (ops->init) |
Julian Anastasov | b922934 | 2012-04-16 04:43:15 +0000 | [diff] [blame] | 111 | err = ops->init(net); |
| 112 | if (!err) |
| 113 | return 0; |
| 114 | |
| 115 | cleanup: |
| 116 | kfree(data); |
| 117 | |
| 118 | out: |
| 119 | return err; |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | static void ops_free(const struct pernet_operations *ops, struct net *net) |
| 123 | { |
| 124 | if (ops->id && ops->size) { |
| 125 | int id = *ops->id; |
| 126 | kfree(net_generic(net, id)); |
| 127 | } |
| 128 | } |
| 129 | |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 130 | static void ops_exit_list(const struct pernet_operations *ops, |
| 131 | struct list_head *net_exit_list) |
| 132 | { |
| 133 | struct net *net; |
| 134 | if (ops->exit) { |
| 135 | list_for_each_entry(net, net_exit_list, exit_list) |
| 136 | ops->exit(net); |
| 137 | } |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 138 | if (ops->exit_batch) |
| 139 | ops->exit_batch(net_exit_list); |
| 140 | } |
| 141 | |
| 142 | static void ops_free_list(const struct pernet_operations *ops, |
| 143 | struct list_head *net_exit_list) |
| 144 | { |
| 145 | struct net *net; |
| 146 | if (ops->size && ops->id) { |
| 147 | list_for_each_entry(net, net_exit_list, exit_list) |
| 148 | ops_free(ops, net); |
| 149 | } |
| 150 | } |
| 151 | |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 152 | /* should be called with nsid_lock held */ |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 153 | static int alloc_netid(struct net *net, struct net *peer, int reqid) |
| 154 | { |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 155 | int min = 0, max = 0; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 156 | |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 157 | if (reqid >= 0) { |
| 158 | min = reqid; |
| 159 | max = reqid + 1; |
| 160 | } |
| 161 | |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 162 | return idr_alloc(&net->netns_ids, peer, min, max, GFP_ATOMIC); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 163 | } |
| 164 | |
| 165 | /* This function is used by idr_for_each(). If net is equal to peer, the |
| 166 | * function returns the id so that idr_for_each() stops. Because we cannot |
| 167 | * returns the id 0 (idr_for_each() will not stop), we return the magic value |
| 168 | * NET_ID_ZERO (-1) for it. |
| 169 | */ |
| 170 | #define NET_ID_ZERO -1 |
| 171 | static int net_eq_idr(int id, void *net, void *peer) |
| 172 | { |
| 173 | if (net_eq(net, peer)) |
| 174 | return id ? : NET_ID_ZERO; |
| 175 | return 0; |
| 176 | } |
| 177 | |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 178 | /* Should be called with nsid_lock held. If a new id is assigned, the bool alloc |
| 179 | * is set to true, thus the caller knows that the new id must be notified via |
| 180 | * rtnl. |
| 181 | */ |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 182 | static int __peernet2id_alloc(struct net *net, struct net *peer, bool *alloc) |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 183 | { |
| 184 | int id = idr_for_each(&net->netns_ids, net_eq_idr, peer); |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 185 | bool alloc_it = *alloc; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 186 | |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 187 | *alloc = false; |
| 188 | |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 189 | /* Magic value for id 0. */ |
| 190 | if (id == NET_ID_ZERO) |
| 191 | return 0; |
| 192 | if (id > 0) |
| 193 | return id; |
| 194 | |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 195 | if (alloc_it) { |
Nicolas Dichtel | 109582af | 2015-05-07 11:02:47 +0200 | [diff] [blame] | 196 | id = alloc_netid(net, peer, -1); |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 197 | *alloc = true; |
Nicolas Dichtel | 109582af | 2015-05-07 11:02:47 +0200 | [diff] [blame] | 198 | return id >= 0 ? id : NETNSA_NSID_NOT_ASSIGNED; |
| 199 | } |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 200 | |
Nicolas Dichtel | 109582af | 2015-05-07 11:02:47 +0200 | [diff] [blame] | 201 | return NETNSA_NSID_NOT_ASSIGNED; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 202 | } |
| 203 | |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 204 | /* should be called with nsid_lock held */ |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 205 | static int __peernet2id(struct net *net, struct net *peer) |
| 206 | { |
| 207 | bool no = false; |
| 208 | |
| 209 | return __peernet2id_alloc(net, peer, &no); |
| 210 | } |
| 211 | |
| 212 | static void rtnl_net_notifyid(struct net *net, int cmd, int id); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 213 | /* This function returns the id of a peer netns. If no id is assigned, one will |
| 214 | * be allocated and returned. |
| 215 | */ |
Nicolas Dichtel | 7a0877d | 2015-05-07 11:02:49 +0200 | [diff] [blame] | 216 | int peernet2id_alloc(struct net *net, struct net *peer) |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 217 | { |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 218 | unsigned long flags; |
| 219 | bool alloc; |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 220 | int id; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 221 | |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 222 | spin_lock_irqsave(&net->nsid_lock, flags); |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 223 | alloc = atomic_read(&peer->count) == 0 ? false : true; |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 224 | id = __peernet2id_alloc(net, peer, &alloc); |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 225 | spin_unlock_irqrestore(&net->nsid_lock, flags); |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 226 | if (alloc && id >= 0) |
| 227 | rtnl_net_notifyid(net, RTM_NEWNSID, id); |
| 228 | return id; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 229 | } |
Nicolas Dichtel | 7a0877d | 2015-05-07 11:02:49 +0200 | [diff] [blame] | 230 | EXPORT_SYMBOL(peernet2id_alloc); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 231 | |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 232 | /* This function returns, if assigned, the id of a peer netns. */ |
Nicolas Dichtel | 59324cf | 2015-05-07 11:02:53 +0200 | [diff] [blame] | 233 | int peernet2id(struct net *net, struct net *peer) |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 234 | { |
| 235 | unsigned long flags; |
| 236 | int id; |
| 237 | |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 238 | spin_lock_irqsave(&net->nsid_lock, flags); |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 239 | id = __peernet2id(net, peer); |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 240 | spin_unlock_irqrestore(&net->nsid_lock, flags); |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 241 | return id; |
| 242 | } |
| 243 | |
Nicolas Dichtel | 59324cf | 2015-05-07 11:02:53 +0200 | [diff] [blame] | 244 | /* This function returns true is the peer netns has an id assigned into the |
| 245 | * current netns. |
| 246 | */ |
| 247 | bool peernet_has_id(struct net *net, struct net *peer) |
| 248 | { |
| 249 | return peernet2id(net, peer) >= 0; |
| 250 | } |
| 251 | |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 252 | struct net *get_net_ns_by_id(struct net *net, int id) |
| 253 | { |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 254 | unsigned long flags; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 255 | struct net *peer; |
| 256 | |
| 257 | if (id < 0) |
| 258 | return NULL; |
| 259 | |
| 260 | rcu_read_lock(); |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 261 | spin_lock_irqsave(&net->nsid_lock, flags); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 262 | peer = idr_find(&net->netns_ids, id); |
| 263 | if (peer) |
| 264 | get_net(peer); |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 265 | spin_unlock_irqrestore(&net->nsid_lock, flags); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 266 | rcu_read_unlock(); |
| 267 | |
| 268 | return peer; |
| 269 | } |
| 270 | |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 271 | /* |
| 272 | * setup_net runs the initializers for the network namespace object. |
| 273 | */ |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 274 | static __net_init int setup_net(struct net *net, struct user_namespace *user_ns) |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 275 | { |
| 276 | /* Must be called with net_mutex held */ |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 277 | const struct pernet_operations *ops, *saved_ops; |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 278 | int error = 0; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 279 | LIST_HEAD(net_exit_list); |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 280 | |
| 281 | atomic_set(&net->count, 1); |
Al Viro | a685e08 | 2011-06-08 21:13:01 -0400 | [diff] [blame] | 282 | atomic_set(&net->passive, 1); |
Thomas Graf | 4e985ad | 2011-06-21 03:11:20 +0000 | [diff] [blame] | 283 | net->dev_base_seq = 1; |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 284 | net->user_ns = user_ns; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 285 | idr_init(&net->netns_ids); |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 286 | spin_lock_init(&net->nsid_lock); |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 287 | |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 288 | list_for_each_entry(ops, &pernet_list, list) { |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 289 | error = ops_init(ops, net); |
| 290 | if (error < 0) |
| 291 | goto out_undo; |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 292 | } |
| 293 | out: |
| 294 | return error; |
| 295 | |
| 296 | out_undo: |
| 297 | /* Walk through the list backwards calling the exit functions |
| 298 | * for the pernet modules whose init functions did not fail. |
| 299 | */ |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 300 | list_add(&net->exit_list, &net_exit_list); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 301 | saved_ops = ops; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 302 | list_for_each_entry_continue_reverse(ops, &pernet_list, list) |
| 303 | ops_exit_list(ops, &net_exit_list); |
| 304 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 305 | ops = saved_ops; |
| 306 | list_for_each_entry_continue_reverse(ops, &pernet_list, list) |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 307 | ops_free_list(ops, &net_exit_list); |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 308 | |
| 309 | rcu_barrier(); |
| 310 | goto out; |
| 311 | } |
| 312 | |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 313 | |
Clemens Noss | ebe47d4 | 2009-02-23 15:37:35 -0800 | [diff] [blame] | 314 | #ifdef CONFIG_NET_NS |
| 315 | static struct kmem_cache *net_cachep; |
| 316 | static struct workqueue_struct *netns_wq; |
| 317 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 318 | static struct net *net_alloc(void) |
| 319 | { |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 320 | struct net *net = NULL; |
| 321 | struct net_generic *ng; |
| 322 | |
| 323 | ng = net_alloc_generic(); |
| 324 | if (!ng) |
| 325 | goto out; |
| 326 | |
| 327 | net = kmem_cache_zalloc(net_cachep, GFP_KERNEL); |
| 328 | if (!net) |
| 329 | goto out_free; |
| 330 | |
| 331 | rcu_assign_pointer(net->gen, ng); |
| 332 | out: |
| 333 | return net; |
| 334 | |
| 335 | out_free: |
| 336 | kfree(ng); |
| 337 | goto out; |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 338 | } |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 339 | |
Johann Felix Soden | 45a19b0 | 2007-11-07 01:30:30 -0800 | [diff] [blame] | 340 | static void net_free(struct net *net) |
| 341 | { |
Eric Dumazet | 416c51e | 2014-09-09 08:24:53 -0700 | [diff] [blame] | 342 | kfree(rcu_access_pointer(net->gen)); |
Johann Felix Soden | 45a19b0 | 2007-11-07 01:30:30 -0800 | [diff] [blame] | 343 | kmem_cache_free(net_cachep, net); |
| 344 | } |
| 345 | |
Al Viro | a685e08 | 2011-06-08 21:13:01 -0400 | [diff] [blame] | 346 | void net_drop_ns(void *p) |
| 347 | { |
| 348 | struct net *ns = p; |
| 349 | if (ns && atomic_dec_and_test(&ns->passive)) |
| 350 | net_free(ns); |
| 351 | } |
| 352 | |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 353 | struct net *copy_net_ns(unsigned long flags, |
| 354 | struct user_namespace *user_ns, struct net *old_net) |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 355 | { |
Alexey Dobriyan | 088eb2d | 2009-05-04 11:12:14 -0700 | [diff] [blame] | 356 | struct net *net; |
| 357 | int rv; |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 358 | |
Rob Landley | 911cb19 | 2011-04-15 02:26:25 +0000 | [diff] [blame] | 359 | if (!(flags & CLONE_NEWNET)) |
| 360 | return get_net(old_net); |
| 361 | |
Alexey Dobriyan | 088eb2d | 2009-05-04 11:12:14 -0700 | [diff] [blame] | 362 | net = net_alloc(); |
| 363 | if (!net) |
| 364 | return ERR_PTR(-ENOMEM); |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 365 | |
| 366 | get_user_ns(user_ns); |
| 367 | |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 368 | mutex_lock(&net_mutex); |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 369 | rv = setup_net(net, user_ns); |
Alexey Dobriyan | 088eb2d | 2009-05-04 11:12:14 -0700 | [diff] [blame] | 370 | if (rv == 0) { |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 371 | rtnl_lock(); |
Johannes Berg | 11a28d3 | 2009-07-10 09:51:33 +0000 | [diff] [blame] | 372 | list_add_tail_rcu(&net->list, &net_namespace_list); |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 373 | rtnl_unlock(); |
| 374 | } |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 375 | mutex_unlock(&net_mutex); |
Alexey Dobriyan | 088eb2d | 2009-05-04 11:12:14 -0700 | [diff] [blame] | 376 | if (rv < 0) { |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 377 | put_user_ns(user_ns); |
Al Viro | a685e08 | 2011-06-08 21:13:01 -0400 | [diff] [blame] | 378 | net_drop_ns(net); |
Alexey Dobriyan | 088eb2d | 2009-05-04 11:12:14 -0700 | [diff] [blame] | 379 | return ERR_PTR(rv); |
| 380 | } |
| 381 | return net; |
| 382 | } |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 383 | |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 384 | static DEFINE_SPINLOCK(cleanup_list_lock); |
| 385 | static LIST_HEAD(cleanup_list); /* Must hold cleanup_list_lock to touch */ |
| 386 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 387 | static void cleanup_net(struct work_struct *work) |
| 388 | { |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 389 | const struct pernet_operations *ops; |
Nicolas Dichtel | 6d458f5 | 2015-04-03 12:02:36 +0200 | [diff] [blame] | 390 | struct net *net, *tmp; |
xiao jin | 1818ce4 | 2014-04-25 08:50:54 +0800 | [diff] [blame] | 391 | struct list_head net_kill_list; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 392 | LIST_HEAD(net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 393 | |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 394 | /* Atomically snapshot the list of namespaces to cleanup */ |
| 395 | spin_lock_irq(&cleanup_list_lock); |
| 396 | list_replace_init(&cleanup_list, &net_kill_list); |
| 397 | spin_unlock_irq(&cleanup_list_lock); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 398 | |
| 399 | mutex_lock(&net_mutex); |
| 400 | |
| 401 | /* Don't let anyone else find us. */ |
Eric W. Biederman | f4618d3 | 2007-09-26 22:40:08 -0700 | [diff] [blame] | 402 | rtnl_lock(); |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 403 | list_for_each_entry(net, &net_kill_list, cleanup_list) { |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 404 | list_del_rcu(&net->list); |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 405 | list_add_tail(&net->exit_list, &net_exit_list); |
Nicolas Dichtel | 6d458f5 | 2015-04-03 12:02:36 +0200 | [diff] [blame] | 406 | for_each_net(tmp) { |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 407 | int id; |
Nicolas Dichtel | 6d458f5 | 2015-04-03 12:02:36 +0200 | [diff] [blame] | 408 | |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 409 | spin_lock_irq(&tmp->nsid_lock); |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 410 | id = __peernet2id(tmp, net); |
| 411 | if (id >= 0) |
Nicolas Dichtel | 6d458f5 | 2015-04-03 12:02:36 +0200 | [diff] [blame] | 412 | idr_remove(&tmp->netns_ids, id); |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 413 | spin_unlock_irq(&tmp->nsid_lock); |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 414 | if (id >= 0) |
| 415 | rtnl_net_notifyid(tmp, RTM_DELNSID, id); |
Nicolas Dichtel | 6d458f5 | 2015-04-03 12:02:36 +0200 | [diff] [blame] | 416 | } |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 417 | spin_lock_irq(&net->nsid_lock); |
Nicolas Dichtel | 6d458f5 | 2015-04-03 12:02:36 +0200 | [diff] [blame] | 418 | idr_destroy(&net->netns_ids); |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 419 | spin_unlock_irq(&net->nsid_lock); |
Nicolas Dichtel | 6d458f5 | 2015-04-03 12:02:36 +0200 | [diff] [blame] | 420 | |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 421 | } |
Eric W. Biederman | f4618d3 | 2007-09-26 22:40:08 -0700 | [diff] [blame] | 422 | rtnl_unlock(); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 423 | |
Johannes Berg | 11a28d3 | 2009-07-10 09:51:33 +0000 | [diff] [blame] | 424 | /* |
| 425 | * Another CPU might be rcu-iterating the list, wait for it. |
| 426 | * This needs to be before calling the exit() notifiers, so |
| 427 | * the rcu_barrier() below isn't sufficient alone. |
| 428 | */ |
| 429 | synchronize_rcu(); |
| 430 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 431 | /* Run all of the network namespace exit methods */ |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 432 | list_for_each_entry_reverse(ops, &pernet_list, list) |
| 433 | ops_exit_list(ops, &net_exit_list); |
| 434 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 435 | /* Free the net generic variables */ |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 436 | list_for_each_entry_reverse(ops, &pernet_list, list) |
| 437 | ops_free_list(ops, &net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 438 | |
| 439 | mutex_unlock(&net_mutex); |
| 440 | |
| 441 | /* Ensure there are no outstanding rcu callbacks using this |
| 442 | * network namespace. |
| 443 | */ |
| 444 | rcu_barrier(); |
| 445 | |
| 446 | /* Finally it is safe to free my network namespace structure */ |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 447 | list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) { |
| 448 | list_del_init(&net->exit_list); |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 449 | put_user_ns(net->user_ns); |
Al Viro | a685e08 | 2011-06-08 21:13:01 -0400 | [diff] [blame] | 450 | net_drop_ns(net); |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 451 | } |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 452 | } |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 453 | static DECLARE_WORK(net_cleanup_work, cleanup_net); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 454 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 455 | void __put_net(struct net *net) |
| 456 | { |
| 457 | /* Cleanup the network namespace in process context */ |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 458 | unsigned long flags; |
| 459 | |
| 460 | spin_lock_irqsave(&cleanup_list_lock, flags); |
| 461 | list_add(&net->cleanup_list, &cleanup_list); |
| 462 | spin_unlock_irqrestore(&cleanup_list_lock, flags); |
| 463 | |
| 464 | queue_work(netns_wq, &net_cleanup_work); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 465 | } |
| 466 | EXPORT_SYMBOL_GPL(__put_net); |
| 467 | |
Stephen Rothwell | 956c920 | 2011-05-12 13:51:13 +1000 | [diff] [blame] | 468 | struct net *get_net_ns_by_fd(int fd) |
| 469 | { |
Stephen Rothwell | 956c920 | 2011-05-12 13:51:13 +1000 | [diff] [blame] | 470 | struct file *file; |
Al Viro | 33c4294 | 2014-11-01 02:32:53 -0400 | [diff] [blame] | 471 | struct ns_common *ns; |
Stephen Rothwell | 956c920 | 2011-05-12 13:51:13 +1000 | [diff] [blame] | 472 | struct net *net; |
| 473 | |
Stephen Rothwell | 956c920 | 2011-05-12 13:51:13 +1000 | [diff] [blame] | 474 | file = proc_ns_fget(fd); |
Al Viro | c316e6a | 2011-06-05 00:37:35 +0000 | [diff] [blame] | 475 | if (IS_ERR(file)) |
| 476 | return ERR_CAST(file); |
Stephen Rothwell | 956c920 | 2011-05-12 13:51:13 +1000 | [diff] [blame] | 477 | |
Al Viro | f77c801 | 2014-11-01 03:13:17 -0400 | [diff] [blame] | 478 | ns = get_proc_ns(file_inode(file)); |
Al Viro | 33c4294 | 2014-11-01 02:32:53 -0400 | [diff] [blame] | 479 | if (ns->ops == &netns_operations) |
| 480 | net = get_net(container_of(ns, struct net, ns)); |
Al Viro | c316e6a | 2011-06-05 00:37:35 +0000 | [diff] [blame] | 481 | else |
| 482 | net = ERR_PTR(-EINVAL); |
Stephen Rothwell | 956c920 | 2011-05-12 13:51:13 +1000 | [diff] [blame] | 483 | |
Al Viro | c316e6a | 2011-06-05 00:37:35 +0000 | [diff] [blame] | 484 | fput(file); |
Stephen Rothwell | 956c920 | 2011-05-12 13:51:13 +1000 | [diff] [blame] | 485 | return net; |
| 486 | } |
| 487 | |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 488 | #else |
Stephen Rothwell | 956c920 | 2011-05-12 13:51:13 +1000 | [diff] [blame] | 489 | struct net *get_net_ns_by_fd(int fd) |
| 490 | { |
| 491 | return ERR_PTR(-EINVAL); |
| 492 | } |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 493 | #endif |
Vadim Kochan | 4b681c8 | 2015-01-12 16:34:05 +0200 | [diff] [blame] | 494 | EXPORT_SYMBOL_GPL(get_net_ns_by_fd); |
Eric W. Biederman | 9dd776b | 2007-09-26 22:04:26 -0700 | [diff] [blame] | 495 | |
Johannes Berg | 30ffee8 | 2009-07-10 09:51:35 +0000 | [diff] [blame] | 496 | struct net *get_net_ns_by_pid(pid_t pid) |
| 497 | { |
| 498 | struct task_struct *tsk; |
| 499 | struct net *net; |
| 500 | |
| 501 | /* Lookup the network namespace */ |
| 502 | net = ERR_PTR(-ESRCH); |
| 503 | rcu_read_lock(); |
| 504 | tsk = find_task_by_vpid(pid); |
| 505 | if (tsk) { |
| 506 | struct nsproxy *nsproxy; |
Eric W. Biederman | 728dba3 | 2014-02-03 19:13:49 -0800 | [diff] [blame] | 507 | task_lock(tsk); |
| 508 | nsproxy = tsk->nsproxy; |
Johannes Berg | 30ffee8 | 2009-07-10 09:51:35 +0000 | [diff] [blame] | 509 | if (nsproxy) |
| 510 | net = get_net(nsproxy->net_ns); |
Eric W. Biederman | 728dba3 | 2014-02-03 19:13:49 -0800 | [diff] [blame] | 511 | task_unlock(tsk); |
Johannes Berg | 30ffee8 | 2009-07-10 09:51:35 +0000 | [diff] [blame] | 512 | } |
| 513 | rcu_read_unlock(); |
| 514 | return net; |
| 515 | } |
| 516 | EXPORT_SYMBOL_GPL(get_net_ns_by_pid); |
| 517 | |
Eric W. Biederman | 98f842e | 2011-06-15 10:21:48 -0700 | [diff] [blame] | 518 | static __net_init int net_ns_net_init(struct net *net) |
| 519 | { |
Al Viro | 33c4294 | 2014-11-01 02:32:53 -0400 | [diff] [blame] | 520 | #ifdef CONFIG_NET_NS |
| 521 | net->ns.ops = &netns_operations; |
| 522 | #endif |
Al Viro | 6344c43 | 2014-11-01 00:45:45 -0400 | [diff] [blame] | 523 | return ns_alloc_inum(&net->ns); |
Eric W. Biederman | 98f842e | 2011-06-15 10:21:48 -0700 | [diff] [blame] | 524 | } |
| 525 | |
| 526 | static __net_exit void net_ns_net_exit(struct net *net) |
| 527 | { |
Al Viro | 6344c43 | 2014-11-01 00:45:45 -0400 | [diff] [blame] | 528 | ns_free_inum(&net->ns); |
Eric W. Biederman | 98f842e | 2011-06-15 10:21:48 -0700 | [diff] [blame] | 529 | } |
| 530 | |
| 531 | static struct pernet_operations __net_initdata net_ns_ops = { |
| 532 | .init = net_ns_net_init, |
| 533 | .exit = net_ns_net_exit, |
| 534 | }; |
| 535 | |
stephen hemminger | 3ee5256 | 2016-08-31 15:17:49 -0700 | [diff] [blame^] | 536 | static const struct nla_policy rtnl_net_policy[NETNSA_MAX + 1] = { |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 537 | [NETNSA_NONE] = { .type = NLA_UNSPEC }, |
| 538 | [NETNSA_NSID] = { .type = NLA_S32 }, |
| 539 | [NETNSA_PID] = { .type = NLA_U32 }, |
| 540 | [NETNSA_FD] = { .type = NLA_U32 }, |
| 541 | }; |
| 542 | |
| 543 | static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh) |
| 544 | { |
| 545 | struct net *net = sock_net(skb->sk); |
| 546 | struct nlattr *tb[NETNSA_MAX + 1]; |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 547 | unsigned long flags; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 548 | struct net *peer; |
| 549 | int nsid, err; |
| 550 | |
| 551 | err = nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, NETNSA_MAX, |
| 552 | rtnl_net_policy); |
| 553 | if (err < 0) |
| 554 | return err; |
| 555 | if (!tb[NETNSA_NSID]) |
| 556 | return -EINVAL; |
| 557 | nsid = nla_get_s32(tb[NETNSA_NSID]); |
| 558 | |
| 559 | if (tb[NETNSA_PID]) |
| 560 | peer = get_net_ns_by_pid(nla_get_u32(tb[NETNSA_PID])); |
| 561 | else if (tb[NETNSA_FD]) |
| 562 | peer = get_net_ns_by_fd(nla_get_u32(tb[NETNSA_FD])); |
| 563 | else |
| 564 | return -EINVAL; |
| 565 | if (IS_ERR(peer)) |
| 566 | return PTR_ERR(peer); |
| 567 | |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 568 | spin_lock_irqsave(&net->nsid_lock, flags); |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 569 | if (__peernet2id(net, peer) >= 0) { |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 570 | spin_unlock_irqrestore(&net->nsid_lock, flags); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 571 | err = -EEXIST; |
| 572 | goto out; |
| 573 | } |
| 574 | |
| 575 | err = alloc_netid(net, peer, nsid); |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 576 | spin_unlock_irqrestore(&net->nsid_lock, flags); |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 577 | if (err >= 0) { |
| 578 | rtnl_net_notifyid(net, RTM_NEWNSID, err); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 579 | err = 0; |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 580 | } |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 581 | out: |
| 582 | put_net(peer); |
| 583 | return err; |
| 584 | } |
| 585 | |
| 586 | static int rtnl_net_get_size(void) |
| 587 | { |
| 588 | return NLMSG_ALIGN(sizeof(struct rtgenmsg)) |
| 589 | + nla_total_size(sizeof(s32)) /* NETNSA_NSID */ |
| 590 | ; |
| 591 | } |
| 592 | |
| 593 | static int rtnl_net_fill(struct sk_buff *skb, u32 portid, u32 seq, int flags, |
Nicolas Dichtel | cab3c8e | 2015-05-07 11:02:48 +0200 | [diff] [blame] | 594 | int cmd, struct net *net, int nsid) |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 595 | { |
| 596 | struct nlmsghdr *nlh; |
| 597 | struct rtgenmsg *rth; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 598 | |
| 599 | nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rth), flags); |
| 600 | if (!nlh) |
| 601 | return -EMSGSIZE; |
| 602 | |
| 603 | rth = nlmsg_data(nlh); |
| 604 | rth->rtgen_family = AF_UNSPEC; |
| 605 | |
Nicolas Dichtel | cab3c8e | 2015-05-07 11:02:48 +0200 | [diff] [blame] | 606 | if (nla_put_s32(skb, NETNSA_NSID, nsid)) |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 607 | goto nla_put_failure; |
| 608 | |
| 609 | nlmsg_end(skb, nlh); |
| 610 | return 0; |
| 611 | |
| 612 | nla_put_failure: |
| 613 | nlmsg_cancel(skb, nlh); |
| 614 | return -EMSGSIZE; |
| 615 | } |
| 616 | |
| 617 | static int rtnl_net_getid(struct sk_buff *skb, struct nlmsghdr *nlh) |
| 618 | { |
| 619 | struct net *net = sock_net(skb->sk); |
| 620 | struct nlattr *tb[NETNSA_MAX + 1]; |
| 621 | struct sk_buff *msg; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 622 | struct net *peer; |
Nicolas Dichtel | cab3c8e | 2015-05-07 11:02:48 +0200 | [diff] [blame] | 623 | int err, id; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 624 | |
| 625 | err = nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, NETNSA_MAX, |
| 626 | rtnl_net_policy); |
| 627 | if (err < 0) |
| 628 | return err; |
| 629 | if (tb[NETNSA_PID]) |
| 630 | peer = get_net_ns_by_pid(nla_get_u32(tb[NETNSA_PID])); |
| 631 | else if (tb[NETNSA_FD]) |
| 632 | peer = get_net_ns_by_fd(nla_get_u32(tb[NETNSA_FD])); |
| 633 | else |
| 634 | return -EINVAL; |
| 635 | |
| 636 | if (IS_ERR(peer)) |
| 637 | return PTR_ERR(peer); |
| 638 | |
| 639 | msg = nlmsg_new(rtnl_net_get_size(), GFP_KERNEL); |
| 640 | if (!msg) { |
| 641 | err = -ENOMEM; |
| 642 | goto out; |
| 643 | } |
| 644 | |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 645 | id = peernet2id(net, peer); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 646 | err = rtnl_net_fill(msg, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 0, |
David S. Miller | b04096f | 2015-05-13 14:31:43 -0400 | [diff] [blame] | 647 | RTM_NEWNSID, net, id); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 648 | if (err < 0) |
| 649 | goto err_out; |
| 650 | |
| 651 | err = rtnl_unicast(msg, net, NETLINK_CB(skb).portid); |
| 652 | goto out; |
| 653 | |
| 654 | err_out: |
| 655 | nlmsg_free(msg); |
| 656 | out: |
| 657 | put_net(peer); |
| 658 | return err; |
| 659 | } |
| 660 | |
Nicolas Dichtel | a143c40 | 2015-04-07 11:51:54 +0200 | [diff] [blame] | 661 | struct rtnl_net_dump_cb { |
| 662 | struct net *net; |
| 663 | struct sk_buff *skb; |
| 664 | struct netlink_callback *cb; |
| 665 | int idx; |
| 666 | int s_idx; |
| 667 | }; |
| 668 | |
| 669 | static int rtnl_net_dumpid_one(int id, void *peer, void *data) |
| 670 | { |
| 671 | struct rtnl_net_dump_cb *net_cb = (struct rtnl_net_dump_cb *)data; |
| 672 | int ret; |
| 673 | |
| 674 | if (net_cb->idx < net_cb->s_idx) |
| 675 | goto cont; |
| 676 | |
| 677 | ret = rtnl_net_fill(net_cb->skb, NETLINK_CB(net_cb->cb->skb).portid, |
| 678 | net_cb->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
Nicolas Dichtel | cab3c8e | 2015-05-07 11:02:48 +0200 | [diff] [blame] | 679 | RTM_NEWNSID, net_cb->net, id); |
Nicolas Dichtel | a143c40 | 2015-04-07 11:51:54 +0200 | [diff] [blame] | 680 | if (ret < 0) |
| 681 | return ret; |
| 682 | |
| 683 | cont: |
| 684 | net_cb->idx++; |
| 685 | return 0; |
| 686 | } |
| 687 | |
| 688 | static int rtnl_net_dumpid(struct sk_buff *skb, struct netlink_callback *cb) |
| 689 | { |
| 690 | struct net *net = sock_net(skb->sk); |
| 691 | struct rtnl_net_dump_cb net_cb = { |
| 692 | .net = net, |
| 693 | .skb = skb, |
| 694 | .cb = cb, |
| 695 | .idx = 0, |
| 696 | .s_idx = cb->args[0], |
| 697 | }; |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 698 | unsigned long flags; |
Nicolas Dichtel | a143c40 | 2015-04-07 11:51:54 +0200 | [diff] [blame] | 699 | |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 700 | spin_lock_irqsave(&net->nsid_lock, flags); |
Nicolas Dichtel | a143c40 | 2015-04-07 11:51:54 +0200 | [diff] [blame] | 701 | idr_for_each(&net->netns_ids, rtnl_net_dumpid_one, &net_cb); |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 702 | spin_unlock_irqrestore(&net->nsid_lock, flags); |
Nicolas Dichtel | a143c40 | 2015-04-07 11:51:54 +0200 | [diff] [blame] | 703 | |
| 704 | cb->args[0] = net_cb.idx; |
| 705 | return skb->len; |
| 706 | } |
| 707 | |
Nicolas Dichtel | cab3c8e | 2015-05-07 11:02:48 +0200 | [diff] [blame] | 708 | static void rtnl_net_notifyid(struct net *net, int cmd, int id) |
Nicolas Dichtel | 9a96345 | 2015-04-07 11:51:53 +0200 | [diff] [blame] | 709 | { |
| 710 | struct sk_buff *msg; |
| 711 | int err = -ENOMEM; |
| 712 | |
| 713 | msg = nlmsg_new(rtnl_net_get_size(), GFP_KERNEL); |
| 714 | if (!msg) |
| 715 | goto out; |
| 716 | |
Nicolas Dichtel | cab3c8e | 2015-05-07 11:02:48 +0200 | [diff] [blame] | 717 | err = rtnl_net_fill(msg, 0, 0, 0, cmd, net, id); |
Nicolas Dichtel | 9a96345 | 2015-04-07 11:51:53 +0200 | [diff] [blame] | 718 | if (err < 0) |
| 719 | goto err_out; |
| 720 | |
| 721 | rtnl_notify(msg, net, 0, RTNLGRP_NSID, NULL, 0); |
| 722 | return; |
| 723 | |
| 724 | err_out: |
| 725 | nlmsg_free(msg); |
| 726 | out: |
| 727 | rtnl_set_sk_err(net, RTNLGRP_NSID, err); |
| 728 | } |
| 729 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 730 | static int __init net_ns_init(void) |
| 731 | { |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 732 | struct net_generic *ng; |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 733 | |
Pavel Emelyanov | d57a921 | 2007-11-01 00:46:50 -0700 | [diff] [blame] | 734 | #ifdef CONFIG_NET_NS |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 735 | net_cachep = kmem_cache_create("net_namespace", sizeof(struct net), |
| 736 | SMP_CACHE_BYTES, |
| 737 | SLAB_PANIC, NULL); |
Benjamin Thery | 3ef1355 | 2007-11-19 23:18:16 -0800 | [diff] [blame] | 738 | |
| 739 | /* Create workqueue for cleanup */ |
| 740 | netns_wq = create_singlethread_workqueue("netns"); |
| 741 | if (!netns_wq) |
| 742 | panic("Could not create netns workq"); |
Pavel Emelyanov | d57a921 | 2007-11-01 00:46:50 -0700 | [diff] [blame] | 743 | #endif |
Benjamin Thery | 3ef1355 | 2007-11-19 23:18:16 -0800 | [diff] [blame] | 744 | |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 745 | ng = net_alloc_generic(); |
| 746 | if (!ng) |
| 747 | panic("Could not allocate generic netns"); |
| 748 | |
| 749 | rcu_assign_pointer(init_net.gen, ng); |
| 750 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 751 | mutex_lock(&net_mutex); |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 752 | if (setup_net(&init_net, &init_user_ns)) |
Stephen Hemminger | ca0f311 | 2009-05-21 15:10:31 -0700 | [diff] [blame] | 753 | panic("Could not setup the initial network namespace"); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 754 | |
Dmitry Torokhov | f8c46cb | 2016-08-10 14:36:00 -0700 | [diff] [blame] | 755 | init_net_initialized = true; |
| 756 | |
Eric W. Biederman | f4618d3 | 2007-09-26 22:40:08 -0700 | [diff] [blame] | 757 | rtnl_lock(); |
Johannes Berg | 11a28d3 | 2009-07-10 09:51:33 +0000 | [diff] [blame] | 758 | list_add_tail_rcu(&init_net.list, &net_namespace_list); |
Eric W. Biederman | f4618d3 | 2007-09-26 22:40:08 -0700 | [diff] [blame] | 759 | rtnl_unlock(); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 760 | |
| 761 | mutex_unlock(&net_mutex); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 762 | |
Eric W. Biederman | 98f842e | 2011-06-15 10:21:48 -0700 | [diff] [blame] | 763 | register_pernet_subsys(&net_ns_ops); |
| 764 | |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 765 | rtnl_register(PF_UNSPEC, RTM_NEWNSID, rtnl_net_newid, NULL, NULL); |
Nicolas Dichtel | a143c40 | 2015-04-07 11:51:54 +0200 | [diff] [blame] | 766 | rtnl_register(PF_UNSPEC, RTM_GETNSID, rtnl_net_getid, rtnl_net_dumpid, |
| 767 | NULL); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 768 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 769 | return 0; |
| 770 | } |
| 771 | |
| 772 | pure_initcall(net_ns_init); |
| 773 | |
Denis V. Lunev | ed160e8 | 2007-11-13 03:23:21 -0800 | [diff] [blame] | 774 | #ifdef CONFIG_NET_NS |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 775 | static int __register_pernet_operations(struct list_head *list, |
| 776 | struct pernet_operations *ops) |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 777 | { |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 778 | struct net *net; |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 779 | int error; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 780 | LIST_HEAD(net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 781 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 782 | list_add_tail(&ops->list, list); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 783 | if (ops->init || (ops->id && ops->size)) { |
Pavel Emelyanov | 1dba323 | 2007-11-01 00:42:43 -0700 | [diff] [blame] | 784 | for_each_net(net) { |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 785 | error = ops_init(ops, net); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 786 | if (error) |
| 787 | goto out_undo; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 788 | list_add_tail(&net->exit_list, &net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 789 | } |
| 790 | } |
Pavel Emelyanov | 1dba323 | 2007-11-01 00:42:43 -0700 | [diff] [blame] | 791 | return 0; |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 792 | |
| 793 | out_undo: |
| 794 | /* If I have an error cleanup all namespaces I initialized */ |
| 795 | list_del(&ops->list); |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 796 | ops_exit_list(ops, &net_exit_list); |
| 797 | ops_free_list(ops, &net_exit_list); |
Pavel Emelyanov | 1dba323 | 2007-11-01 00:42:43 -0700 | [diff] [blame] | 798 | return error; |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 799 | } |
| 800 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 801 | static void __unregister_pernet_operations(struct pernet_operations *ops) |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 802 | { |
| 803 | struct net *net; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 804 | LIST_HEAD(net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 805 | |
| 806 | list_del(&ops->list); |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 807 | for_each_net(net) |
| 808 | list_add_tail(&net->exit_list, &net_exit_list); |
| 809 | ops_exit_list(ops, &net_exit_list); |
| 810 | ops_free_list(ops, &net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 811 | } |
| 812 | |
Denis V. Lunev | ed160e8 | 2007-11-13 03:23:21 -0800 | [diff] [blame] | 813 | #else |
| 814 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 815 | static int __register_pernet_operations(struct list_head *list, |
| 816 | struct pernet_operations *ops) |
| 817 | { |
Dmitry Torokhov | f8c46cb | 2016-08-10 14:36:00 -0700 | [diff] [blame] | 818 | if (!init_net_initialized) { |
| 819 | list_add_tail(&ops->list, list); |
| 820 | return 0; |
| 821 | } |
| 822 | |
Julian Anastasov | b922934 | 2012-04-16 04:43:15 +0000 | [diff] [blame] | 823 | return ops_init(ops, &init_net); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 824 | } |
| 825 | |
| 826 | static void __unregister_pernet_operations(struct pernet_operations *ops) |
| 827 | { |
Dmitry Torokhov | f8c46cb | 2016-08-10 14:36:00 -0700 | [diff] [blame] | 828 | if (!init_net_initialized) { |
| 829 | list_del(&ops->list); |
| 830 | } else { |
| 831 | LIST_HEAD(net_exit_list); |
| 832 | list_add(&init_net.exit_list, &net_exit_list); |
| 833 | ops_exit_list(ops, &net_exit_list); |
| 834 | ops_free_list(ops, &net_exit_list); |
| 835 | } |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 836 | } |
| 837 | |
| 838 | #endif /* CONFIG_NET_NS */ |
| 839 | |
| 840 | static DEFINE_IDA(net_generic_ids); |
| 841 | |
Denis V. Lunev | ed160e8 | 2007-11-13 03:23:21 -0800 | [diff] [blame] | 842 | static int register_pernet_operations(struct list_head *list, |
| 843 | struct pernet_operations *ops) |
| 844 | { |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 845 | int error; |
| 846 | |
| 847 | if (ops->id) { |
| 848 | again: |
| 849 | error = ida_get_new_above(&net_generic_ids, 1, ops->id); |
| 850 | if (error < 0) { |
| 851 | if (error == -EAGAIN) { |
| 852 | ida_pre_get(&net_generic_ids, GFP_KERNEL); |
| 853 | goto again; |
| 854 | } |
| 855 | return error; |
| 856 | } |
Eric Dumazet | 073862b | 2012-01-26 00:41:38 +0000 | [diff] [blame] | 857 | max_gen_ptrs = max_t(unsigned int, max_gen_ptrs, *ops->id); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 858 | } |
| 859 | error = __register_pernet_operations(list, ops); |
Eric W. Biederman | 3a765ed | 2009-12-03 02:29:06 +0000 | [diff] [blame] | 860 | if (error) { |
| 861 | rcu_barrier(); |
| 862 | if (ops->id) |
| 863 | ida_remove(&net_generic_ids, *ops->id); |
| 864 | } |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 865 | |
| 866 | return error; |
Denis V. Lunev | ed160e8 | 2007-11-13 03:23:21 -0800 | [diff] [blame] | 867 | } |
| 868 | |
| 869 | static void unregister_pernet_operations(struct pernet_operations *ops) |
| 870 | { |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 871 | |
| 872 | __unregister_pernet_operations(ops); |
Eric W. Biederman | 3a765ed | 2009-12-03 02:29:06 +0000 | [diff] [blame] | 873 | rcu_barrier(); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 874 | if (ops->id) |
| 875 | ida_remove(&net_generic_ids, *ops->id); |
Denis V. Lunev | ed160e8 | 2007-11-13 03:23:21 -0800 | [diff] [blame] | 876 | } |
Pavel Emelyanov | c93cf61 | 2008-04-15 00:35:23 -0700 | [diff] [blame] | 877 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 878 | /** |
| 879 | * register_pernet_subsys - register a network namespace subsystem |
| 880 | * @ops: pernet operations structure for the subsystem |
| 881 | * |
| 882 | * Register a subsystem which has init and exit functions |
| 883 | * that are called when network namespaces are created and |
| 884 | * destroyed respectively. |
| 885 | * |
| 886 | * When registered all network namespace init functions are |
| 887 | * called for every existing network namespace. Allowing kernel |
| 888 | * modules to have a race free view of the set of network namespaces. |
| 889 | * |
| 890 | * When a new network namespace is created all of the init |
| 891 | * methods are called in the order in which they were registered. |
| 892 | * |
| 893 | * When a network namespace is destroyed all of the exit methods |
| 894 | * are called in the reverse of the order with which they were |
| 895 | * registered. |
| 896 | */ |
| 897 | int register_pernet_subsys(struct pernet_operations *ops) |
| 898 | { |
| 899 | int error; |
| 900 | mutex_lock(&net_mutex); |
| 901 | error = register_pernet_operations(first_device, ops); |
| 902 | mutex_unlock(&net_mutex); |
| 903 | return error; |
| 904 | } |
| 905 | EXPORT_SYMBOL_GPL(register_pernet_subsys); |
| 906 | |
| 907 | /** |
| 908 | * unregister_pernet_subsys - unregister a network namespace subsystem |
| 909 | * @ops: pernet operations structure to manipulate |
| 910 | * |
| 911 | * Remove the pernet operations structure from the list to be |
Oliver Pinter | 53379e5 | 2008-02-03 17:56:48 +0200 | [diff] [blame] | 912 | * used when network namespaces are created or destroyed. In |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 913 | * addition run the exit method for all existing network |
| 914 | * namespaces. |
| 915 | */ |
Jiri Pirko | b3c981d | 2010-04-25 00:49:56 -0700 | [diff] [blame] | 916 | void unregister_pernet_subsys(struct pernet_operations *ops) |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 917 | { |
| 918 | mutex_lock(&net_mutex); |
Jiri Pirko | b3c981d | 2010-04-25 00:49:56 -0700 | [diff] [blame] | 919 | unregister_pernet_operations(ops); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 920 | mutex_unlock(&net_mutex); |
| 921 | } |
| 922 | EXPORT_SYMBOL_GPL(unregister_pernet_subsys); |
| 923 | |
| 924 | /** |
| 925 | * register_pernet_device - register a network namespace device |
| 926 | * @ops: pernet operations structure for the subsystem |
| 927 | * |
| 928 | * Register a device which has init and exit functions |
| 929 | * that are called when network namespaces are created and |
| 930 | * destroyed respectively. |
| 931 | * |
| 932 | * When registered all network namespace init functions are |
| 933 | * called for every existing network namespace. Allowing kernel |
| 934 | * modules to have a race free view of the set of network namespaces. |
| 935 | * |
| 936 | * When a new network namespace is created all of the init |
| 937 | * methods are called in the order in which they were registered. |
| 938 | * |
| 939 | * When a network namespace is destroyed all of the exit methods |
| 940 | * are called in the reverse of the order with which they were |
| 941 | * registered. |
| 942 | */ |
| 943 | int register_pernet_device(struct pernet_operations *ops) |
| 944 | { |
| 945 | int error; |
| 946 | mutex_lock(&net_mutex); |
| 947 | error = register_pernet_operations(&pernet_list, ops); |
| 948 | if (!error && (first_device == &pernet_list)) |
| 949 | first_device = &ops->list; |
| 950 | mutex_unlock(&net_mutex); |
| 951 | return error; |
| 952 | } |
| 953 | EXPORT_SYMBOL_GPL(register_pernet_device); |
| 954 | |
| 955 | /** |
| 956 | * unregister_pernet_device - unregister a network namespace netdevice |
| 957 | * @ops: pernet operations structure to manipulate |
| 958 | * |
| 959 | * Remove the pernet operations structure from the list to be |
Oliver Pinter | 53379e5 | 2008-02-03 17:56:48 +0200 | [diff] [blame] | 960 | * used when network namespaces are created or destroyed. In |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 961 | * addition run the exit method for all existing network |
| 962 | * namespaces. |
| 963 | */ |
| 964 | void unregister_pernet_device(struct pernet_operations *ops) |
| 965 | { |
| 966 | mutex_lock(&net_mutex); |
| 967 | if (&ops->list == first_device) |
| 968 | first_device = first_device->next; |
| 969 | unregister_pernet_operations(ops); |
| 970 | mutex_unlock(&net_mutex); |
| 971 | } |
| 972 | EXPORT_SYMBOL_GPL(unregister_pernet_device); |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 973 | |
| 974 | #ifdef CONFIG_NET_NS |
Al Viro | 6496452 | 2014-11-01 00:37:32 -0400 | [diff] [blame] | 975 | static struct ns_common *netns_get(struct task_struct *task) |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 976 | { |
Eric W. Biederman | f063052 | 2011-05-04 17:51:50 -0700 | [diff] [blame] | 977 | struct net *net = NULL; |
| 978 | struct nsproxy *nsproxy; |
| 979 | |
Eric W. Biederman | 728dba3 | 2014-02-03 19:13:49 -0800 | [diff] [blame] | 980 | task_lock(task); |
| 981 | nsproxy = task->nsproxy; |
Eric W. Biederman | f063052 | 2011-05-04 17:51:50 -0700 | [diff] [blame] | 982 | if (nsproxy) |
| 983 | net = get_net(nsproxy->net_ns); |
Eric W. Biederman | 728dba3 | 2014-02-03 19:13:49 -0800 | [diff] [blame] | 984 | task_unlock(task); |
Eric W. Biederman | f063052 | 2011-05-04 17:51:50 -0700 | [diff] [blame] | 985 | |
Al Viro | ff24870 | 2014-11-01 00:10:50 -0400 | [diff] [blame] | 986 | return net ? &net->ns : NULL; |
| 987 | } |
| 988 | |
| 989 | static inline struct net *to_net_ns(struct ns_common *ns) |
| 990 | { |
| 991 | return container_of(ns, struct net, ns); |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 992 | } |
| 993 | |
Al Viro | 6496452 | 2014-11-01 00:37:32 -0400 | [diff] [blame] | 994 | static void netns_put(struct ns_common *ns) |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 995 | { |
Al Viro | ff24870 | 2014-11-01 00:10:50 -0400 | [diff] [blame] | 996 | put_net(to_net_ns(ns)); |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 997 | } |
| 998 | |
Al Viro | 6496452 | 2014-11-01 00:37:32 -0400 | [diff] [blame] | 999 | static int netns_install(struct nsproxy *nsproxy, struct ns_common *ns) |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 1000 | { |
Al Viro | ff24870 | 2014-11-01 00:10:50 -0400 | [diff] [blame] | 1001 | struct net *net = to_net_ns(ns); |
Eric W. Biederman | 142e1d1 | 2012-07-26 01:13:20 -0700 | [diff] [blame] | 1002 | |
Eric W. Biederman | 5e4a084 | 2012-12-14 07:55:36 -0800 | [diff] [blame] | 1003 | if (!ns_capable(net->user_ns, CAP_SYS_ADMIN) || |
Eric W. Biederman | c7b96ac | 2013-03-20 12:49:49 -0700 | [diff] [blame] | 1004 | !ns_capable(current_user_ns(), CAP_SYS_ADMIN)) |
Eric W. Biederman | 142e1d1 | 2012-07-26 01:13:20 -0700 | [diff] [blame] | 1005 | return -EPERM; |
| 1006 | |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 1007 | put_net(nsproxy->net_ns); |
Eric W. Biederman | 142e1d1 | 2012-07-26 01:13:20 -0700 | [diff] [blame] | 1008 | nsproxy->net_ns = get_net(net); |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 1009 | return 0; |
| 1010 | } |
| 1011 | |
| 1012 | const struct proc_ns_operations netns_operations = { |
| 1013 | .name = "net", |
| 1014 | .type = CLONE_NEWNET, |
| 1015 | .get = netns_get, |
| 1016 | .put = netns_put, |
| 1017 | .install = netns_install, |
| 1018 | }; |
| 1019 | #endif |