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> |
Ingo Molnar | f719ff9b | 2017-02-06 10:57:33 +0100 | [diff] [blame] | 19 | #include <linux/sched/task.h> |
| 20 | |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 21 | #include <net/sock.h> |
| 22 | #include <net/netlink.h> |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 23 | #include <net/net_namespace.h> |
Pavel Emelyanov | dec827d | 2008-04-15 00:36:08 -0700 | [diff] [blame] | 24 | #include <net/netns/generic.h> |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 25 | |
| 26 | /* |
| 27 | * Our network namespace constructor/destructor lists |
| 28 | */ |
| 29 | |
| 30 | static LIST_HEAD(pernet_list); |
| 31 | static struct list_head *first_device = &pernet_list; |
Cong Wang | 200b916 | 2014-05-12 15:11:20 -0700 | [diff] [blame] | 32 | DEFINE_MUTEX(net_mutex); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 33 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 34 | LIST_HEAD(net_namespace_list); |
Alexey Dobriyan | b76a461 | 2008-10-08 11:35:06 +0200 | [diff] [blame] | 35 | EXPORT_SYMBOL_GPL(net_namespace_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 36 | |
Rustad, Mark D | 734b654 | 2012-07-18 09:06:07 +0000 | [diff] [blame] | 37 | struct net init_net = { |
David Howells | b5082df | 2017-04-27 22:40:23 +0100 | [diff] [blame] | 38 | .count = ATOMIC_INIT(1), |
| 39 | .dev_base_head = LIST_HEAD_INIT(init_net.dev_base_head), |
Rustad, Mark D | 734b654 | 2012-07-18 09:06:07 +0000 | [diff] [blame] | 40 | }; |
Denis V. Lunev | ff4b950 | 2008-01-22 22:05:33 -0800 | [diff] [blame] | 41 | EXPORT_SYMBOL(init_net); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 42 | |
Dmitry Torokhov | f8c46cb | 2016-08-10 14:36:00 -0700 | [diff] [blame] | 43 | static bool init_net_initialized; |
| 44 | |
Alexey Dobriyan | 6af2d5f | 2016-12-02 04:21:32 +0300 | [diff] [blame] | 45 | #define MIN_PERNET_OPS_ID \ |
| 46 | ((sizeof(struct net_generic) + sizeof(void *) - 1) / sizeof(void *)) |
| 47 | |
Pavel Emelyanov | dec827d | 2008-04-15 00:36:08 -0700 | [diff] [blame] | 48 | #define INITIAL_NET_GEN_PTRS 13 /* +1 for len +2 for rcu_head */ |
| 49 | |
Eric Dumazet | 073862b | 2012-01-26 00:41:38 +0000 | [diff] [blame] | 50 | static unsigned int max_gen_ptrs = INITIAL_NET_GEN_PTRS; |
| 51 | |
| 52 | static struct net_generic *net_alloc_generic(void) |
| 53 | { |
| 54 | struct net_generic *ng; |
Alexey Dobriyan | 6af2d5f | 2016-12-02 04:21:32 +0300 | [diff] [blame] | 55 | unsigned int generic_size = offsetof(struct net_generic, ptr[max_gen_ptrs]); |
Eric Dumazet | 073862b | 2012-01-26 00:41:38 +0000 | [diff] [blame] | 56 | |
| 57 | ng = kzalloc(generic_size, GFP_KERNEL); |
| 58 | if (ng) |
Alexey Dobriyan | 9bfc7b9 | 2016-12-02 04:12:58 +0300 | [diff] [blame] | 59 | ng->s.len = max_gen_ptrs; |
Eric Dumazet | 073862b | 2012-01-26 00:41:38 +0000 | [diff] [blame] | 60 | |
| 61 | return ng; |
| 62 | } |
| 63 | |
Alexey Dobriyan | c7d03a0 | 2016-11-17 04:58:21 +0300 | [diff] [blame] | 64 | static int net_assign_generic(struct net *net, unsigned int id, void *data) |
Jiri Pirko | 05fceb4 | 2010-04-23 01:40:47 +0000 | [diff] [blame] | 65 | { |
| 66 | struct net_generic *ng, *old_ng; |
| 67 | |
| 68 | BUG_ON(!mutex_is_locked(&net_mutex)); |
Alexey Dobriyan | 6af2d5f | 2016-12-02 04:21:32 +0300 | [diff] [blame] | 69 | BUG_ON(id < MIN_PERNET_OPS_ID); |
Jiri Pirko | 05fceb4 | 2010-04-23 01:40:47 +0000 | [diff] [blame] | 70 | |
Eric Dumazet | 1c87733 | 2010-10-25 03:20:11 +0000 | [diff] [blame] | 71 | old_ng = rcu_dereference_protected(net->gen, |
| 72 | lockdep_is_held(&net_mutex)); |
Alexey Dobriyan | 6af2d5f | 2016-12-02 04:21:32 +0300 | [diff] [blame] | 73 | if (old_ng->s.len > id) { |
| 74 | old_ng->ptr[id] = data; |
Alexey Dobriyan | 1a9a0592 | 2016-12-02 04:11:34 +0300 | [diff] [blame] | 75 | return 0; |
| 76 | } |
Jiri Pirko | 05fceb4 | 2010-04-23 01:40:47 +0000 | [diff] [blame] | 77 | |
Eric Dumazet | 073862b | 2012-01-26 00:41:38 +0000 | [diff] [blame] | 78 | ng = net_alloc_generic(); |
Jiri Pirko | 05fceb4 | 2010-04-23 01:40:47 +0000 | [diff] [blame] | 79 | if (ng == NULL) |
| 80 | return -ENOMEM; |
| 81 | |
| 82 | /* |
| 83 | * Some synchronisation notes: |
| 84 | * |
| 85 | * The net_generic explores the net->gen array inside rcu |
| 86 | * read section. Besides once set the net->gen->ptr[x] |
| 87 | * pointer never changes (see rules in netns/generic.h). |
| 88 | * |
| 89 | * That said, we simply duplicate this array and schedule |
| 90 | * the old copy for kfree after a grace period. |
| 91 | */ |
| 92 | |
Alexey Dobriyan | 6af2d5f | 2016-12-02 04:21:32 +0300 | [diff] [blame] | 93 | memcpy(&ng->ptr[MIN_PERNET_OPS_ID], &old_ng->ptr[MIN_PERNET_OPS_ID], |
| 94 | (old_ng->s.len - MIN_PERNET_OPS_ID) * sizeof(void *)); |
| 95 | ng->ptr[id] = data; |
Jiri Pirko | 05fceb4 | 2010-04-23 01:40:47 +0000 | [diff] [blame] | 96 | |
| 97 | rcu_assign_pointer(net->gen, ng); |
Alexey Dobriyan | 9bfc7b9 | 2016-12-02 04:12:58 +0300 | [diff] [blame] | 98 | kfree_rcu(old_ng, s.rcu); |
Jiri Pirko | 05fceb4 | 2010-04-23 01:40:47 +0000 | [diff] [blame] | 99 | return 0; |
| 100 | } |
| 101 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 102 | static int ops_init(const struct pernet_operations *ops, struct net *net) |
| 103 | { |
Julian Anastasov | b922934 | 2012-04-16 04:43:15 +0000 | [diff] [blame] | 104 | int err = -ENOMEM; |
| 105 | void *data = NULL; |
| 106 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 107 | if (ops->id && ops->size) { |
Julian Anastasov | b922934 | 2012-04-16 04:43:15 +0000 | [diff] [blame] | 108 | data = kzalloc(ops->size, GFP_KERNEL); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 109 | if (!data) |
Julian Anastasov | b922934 | 2012-04-16 04:43:15 +0000 | [diff] [blame] | 110 | goto out; |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 111 | |
| 112 | err = net_assign_generic(net, *ops->id, data); |
Julian Anastasov | b922934 | 2012-04-16 04:43:15 +0000 | [diff] [blame] | 113 | if (err) |
| 114 | goto cleanup; |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 115 | } |
Julian Anastasov | b922934 | 2012-04-16 04:43:15 +0000 | [diff] [blame] | 116 | err = 0; |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 117 | if (ops->init) |
Julian Anastasov | b922934 | 2012-04-16 04:43:15 +0000 | [diff] [blame] | 118 | err = ops->init(net); |
| 119 | if (!err) |
| 120 | return 0; |
| 121 | |
| 122 | cleanup: |
| 123 | kfree(data); |
| 124 | |
| 125 | out: |
| 126 | return err; |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 127 | } |
| 128 | |
| 129 | static void ops_free(const struct pernet_operations *ops, struct net *net) |
| 130 | { |
| 131 | if (ops->id && ops->size) { |
Alexey Dobriyan | c7d03a0 | 2016-11-17 04:58:21 +0300 | [diff] [blame] | 132 | kfree(net_generic(net, *ops->id)); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 133 | } |
| 134 | } |
| 135 | |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 136 | static void ops_exit_list(const struct pernet_operations *ops, |
| 137 | struct list_head *net_exit_list) |
| 138 | { |
| 139 | struct net *net; |
| 140 | if (ops->exit) { |
| 141 | list_for_each_entry(net, net_exit_list, exit_list) |
| 142 | ops->exit(net); |
| 143 | } |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 144 | if (ops->exit_batch) |
| 145 | ops->exit_batch(net_exit_list); |
| 146 | } |
| 147 | |
| 148 | static void ops_free_list(const struct pernet_operations *ops, |
| 149 | struct list_head *net_exit_list) |
| 150 | { |
| 151 | struct net *net; |
| 152 | if (ops->size && ops->id) { |
| 153 | list_for_each_entry(net, net_exit_list, exit_list) |
| 154 | ops_free(ops, net); |
| 155 | } |
| 156 | } |
| 157 | |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 158 | /* should be called with nsid_lock held */ |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 159 | static int alloc_netid(struct net *net, struct net *peer, int reqid) |
| 160 | { |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 161 | int min = 0, max = 0; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 162 | |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 163 | if (reqid >= 0) { |
| 164 | min = reqid; |
| 165 | max = reqid + 1; |
| 166 | } |
| 167 | |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 168 | return idr_alloc(&net->netns_ids, peer, min, max, GFP_ATOMIC); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 169 | } |
| 170 | |
| 171 | /* This function is used by idr_for_each(). If net is equal to peer, the |
| 172 | * function returns the id so that idr_for_each() stops. Because we cannot |
| 173 | * returns the id 0 (idr_for_each() will not stop), we return the magic value |
| 174 | * NET_ID_ZERO (-1) for it. |
| 175 | */ |
| 176 | #define NET_ID_ZERO -1 |
| 177 | static int net_eq_idr(int id, void *net, void *peer) |
| 178 | { |
| 179 | if (net_eq(net, peer)) |
| 180 | return id ? : NET_ID_ZERO; |
| 181 | return 0; |
| 182 | } |
| 183 | |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 184 | /* Should be called with nsid_lock held. If a new id is assigned, the bool alloc |
| 185 | * is set to true, thus the caller knows that the new id must be notified via |
| 186 | * rtnl. |
| 187 | */ |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 188 | static int __peernet2id_alloc(struct net *net, struct net *peer, bool *alloc) |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 189 | { |
| 190 | int id = idr_for_each(&net->netns_ids, net_eq_idr, peer); |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 191 | bool alloc_it = *alloc; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 192 | |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 193 | *alloc = false; |
| 194 | |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 195 | /* Magic value for id 0. */ |
| 196 | if (id == NET_ID_ZERO) |
| 197 | return 0; |
| 198 | if (id > 0) |
| 199 | return id; |
| 200 | |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 201 | if (alloc_it) { |
Nicolas Dichtel | 109582af | 2015-05-07 11:02:47 +0200 | [diff] [blame] | 202 | id = alloc_netid(net, peer, -1); |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 203 | *alloc = true; |
Nicolas Dichtel | 109582af | 2015-05-07 11:02:47 +0200 | [diff] [blame] | 204 | return id >= 0 ? id : NETNSA_NSID_NOT_ASSIGNED; |
| 205 | } |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 206 | |
Nicolas Dichtel | 109582af | 2015-05-07 11:02:47 +0200 | [diff] [blame] | 207 | return NETNSA_NSID_NOT_ASSIGNED; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 208 | } |
| 209 | |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 210 | /* should be called with nsid_lock held */ |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 211 | static int __peernet2id(struct net *net, struct net *peer) |
| 212 | { |
| 213 | bool no = false; |
| 214 | |
| 215 | return __peernet2id_alloc(net, peer, &no); |
| 216 | } |
| 217 | |
| 218 | static void rtnl_net_notifyid(struct net *net, int cmd, int id); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 219 | /* This function returns the id of a peer netns. If no id is assigned, one will |
| 220 | * be allocated and returned. |
| 221 | */ |
Nicolas Dichtel | 7a0877d | 2015-05-07 11:02:49 +0200 | [diff] [blame] | 222 | int peernet2id_alloc(struct net *net, struct net *peer) |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 223 | { |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 224 | bool alloc; |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 225 | int id; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 226 | |
WANG Cong | cfc44a4 | 2016-11-16 10:27:02 -0800 | [diff] [blame] | 227 | if (atomic_read(&net->count) == 0) |
| 228 | return NETNSA_NSID_NOT_ASSIGNED; |
Paul Moore | fba143c | 2016-11-29 16:57:48 -0500 | [diff] [blame] | 229 | spin_lock_bh(&net->nsid_lock); |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 230 | alloc = atomic_read(&peer->count) == 0 ? false : true; |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 231 | id = __peernet2id_alloc(net, peer, &alloc); |
Paul Moore | fba143c | 2016-11-29 16:57:48 -0500 | [diff] [blame] | 232 | spin_unlock_bh(&net->nsid_lock); |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 233 | if (alloc && id >= 0) |
| 234 | rtnl_net_notifyid(net, RTM_NEWNSID, id); |
| 235 | return id; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 236 | } |
| 237 | |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 238 | /* This function returns, if assigned, the id of a peer netns. */ |
Nicolas Dichtel | 59324cf | 2015-05-07 11:02:53 +0200 | [diff] [blame] | 239 | int peernet2id(struct net *net, struct net *peer) |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 240 | { |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 241 | int id; |
| 242 | |
Paul Moore | fba143c | 2016-11-29 16:57:48 -0500 | [diff] [blame] | 243 | spin_lock_bh(&net->nsid_lock); |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 244 | id = __peernet2id(net, peer); |
Paul Moore | fba143c | 2016-11-29 16:57:48 -0500 | [diff] [blame] | 245 | spin_unlock_bh(&net->nsid_lock); |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 246 | return id; |
| 247 | } |
WANG Cong | 38f507f | 2016-09-01 21:53:44 -0700 | [diff] [blame] | 248 | EXPORT_SYMBOL(peernet2id); |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 249 | |
Nicolas Dichtel | 59324cf | 2015-05-07 11:02:53 +0200 | [diff] [blame] | 250 | /* This function returns true is the peer netns has an id assigned into the |
| 251 | * current netns. |
| 252 | */ |
| 253 | bool peernet_has_id(struct net *net, struct net *peer) |
| 254 | { |
| 255 | return peernet2id(net, peer) >= 0; |
| 256 | } |
| 257 | |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 258 | struct net *get_net_ns_by_id(struct net *net, int id) |
| 259 | { |
| 260 | struct net *peer; |
| 261 | |
| 262 | if (id < 0) |
| 263 | return NULL; |
| 264 | |
| 265 | rcu_read_lock(); |
Paul Moore | fba143c | 2016-11-29 16:57:48 -0500 | [diff] [blame] | 266 | spin_lock_bh(&net->nsid_lock); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 267 | peer = idr_find(&net->netns_ids, id); |
| 268 | if (peer) |
| 269 | get_net(peer); |
Paul Moore | fba143c | 2016-11-29 16:57:48 -0500 | [diff] [blame] | 270 | spin_unlock_bh(&net->nsid_lock); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 271 | rcu_read_unlock(); |
| 272 | |
| 273 | return peer; |
| 274 | } |
| 275 | |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 276 | /* |
| 277 | * setup_net runs the initializers for the network namespace object. |
| 278 | */ |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 279 | 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] | 280 | { |
| 281 | /* Must be called with net_mutex held */ |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 282 | const struct pernet_operations *ops, *saved_ops; |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 283 | int error = 0; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 284 | LIST_HEAD(net_exit_list); |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 285 | |
| 286 | atomic_set(&net->count, 1); |
Al Viro | a685e08 | 2011-06-08 21:13:01 -0400 | [diff] [blame] | 287 | atomic_set(&net->passive, 1); |
Thomas Graf | 4e985ad | 2011-06-21 03:11:20 +0000 | [diff] [blame] | 288 | net->dev_base_seq = 1; |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 289 | net->user_ns = user_ns; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 290 | idr_init(&net->netns_ids); |
WANG Cong | de13346 | 2015-05-15 14:47:32 -0700 | [diff] [blame] | 291 | spin_lock_init(&net->nsid_lock); |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 292 | |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 293 | list_for_each_entry(ops, &pernet_list, list) { |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 294 | error = ops_init(ops, net); |
| 295 | if (error < 0) |
| 296 | goto out_undo; |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 297 | } |
| 298 | out: |
| 299 | return error; |
| 300 | |
| 301 | out_undo: |
| 302 | /* Walk through the list backwards calling the exit functions |
| 303 | * for the pernet modules whose init functions did not fail. |
| 304 | */ |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 305 | list_add(&net->exit_list, &net_exit_list); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 306 | saved_ops = ops; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 307 | list_for_each_entry_continue_reverse(ops, &pernet_list, list) |
| 308 | ops_exit_list(ops, &net_exit_list); |
| 309 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 310 | ops = saved_ops; |
| 311 | list_for_each_entry_continue_reverse(ops, &pernet_list, list) |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 312 | ops_free_list(ops, &net_exit_list); |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 313 | |
| 314 | rcu_barrier(); |
| 315 | goto out; |
| 316 | } |
| 317 | |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 318 | |
Clemens Noss | ebe47d47 | 2009-02-23 15:37:35 -0800 | [diff] [blame] | 319 | #ifdef CONFIG_NET_NS |
Arnd Bergmann | 2ed6afd | 2016-09-23 18:06:12 +0200 | [diff] [blame] | 320 | static struct ucounts *inc_net_namespaces(struct user_namespace *ns) |
| 321 | { |
| 322 | return inc_ucount(ns, current_euid(), UCOUNT_NET_NAMESPACES); |
| 323 | } |
| 324 | |
| 325 | static void dec_net_namespaces(struct ucounts *ucounts) |
| 326 | { |
| 327 | dec_ucount(ucounts, UCOUNT_NET_NAMESPACES); |
| 328 | } |
| 329 | |
Clemens Noss | ebe47d47 | 2009-02-23 15:37:35 -0800 | [diff] [blame] | 330 | static struct kmem_cache *net_cachep; |
| 331 | static struct workqueue_struct *netns_wq; |
| 332 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 333 | static struct net *net_alloc(void) |
| 334 | { |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 335 | struct net *net = NULL; |
| 336 | struct net_generic *ng; |
| 337 | |
| 338 | ng = net_alloc_generic(); |
| 339 | if (!ng) |
| 340 | goto out; |
| 341 | |
| 342 | net = kmem_cache_zalloc(net_cachep, GFP_KERNEL); |
| 343 | if (!net) |
| 344 | goto out_free; |
| 345 | |
| 346 | rcu_assign_pointer(net->gen, ng); |
| 347 | out: |
| 348 | return net; |
| 349 | |
| 350 | out_free: |
| 351 | kfree(ng); |
| 352 | goto out; |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 353 | } |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 354 | |
Johann Felix Soden | 45a19b0 | 2007-11-07 01:30:30 -0800 | [diff] [blame] | 355 | static void net_free(struct net *net) |
| 356 | { |
Eric Dumazet | 416c51e | 2014-09-09 08:24:53 -0700 | [diff] [blame] | 357 | kfree(rcu_access_pointer(net->gen)); |
Johann Felix Soden | 45a19b0 | 2007-11-07 01:30:30 -0800 | [diff] [blame] | 358 | kmem_cache_free(net_cachep, net); |
| 359 | } |
| 360 | |
Al Viro | a685e08 | 2011-06-08 21:13:01 -0400 | [diff] [blame] | 361 | void net_drop_ns(void *p) |
| 362 | { |
| 363 | struct net *ns = p; |
| 364 | if (ns && atomic_dec_and_test(&ns->passive)) |
| 365 | net_free(ns); |
| 366 | } |
| 367 | |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 368 | struct net *copy_net_ns(unsigned long flags, |
| 369 | struct user_namespace *user_ns, struct net *old_net) |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 370 | { |
Eric W. Biederman | 7032866 | 2016-08-08 14:33:23 -0500 | [diff] [blame] | 371 | struct ucounts *ucounts; |
Alexey Dobriyan | 088eb2d9 | 2009-05-04 11:12:14 -0700 | [diff] [blame] | 372 | struct net *net; |
| 373 | int rv; |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 374 | |
Rob Landley | 911cb19 | 2011-04-15 02:26:25 +0000 | [diff] [blame] | 375 | if (!(flags & CLONE_NEWNET)) |
| 376 | return get_net(old_net); |
| 377 | |
Eric W. Biederman | 7032866 | 2016-08-08 14:33:23 -0500 | [diff] [blame] | 378 | ucounts = inc_net_namespaces(user_ns); |
| 379 | if (!ucounts) |
Eric W. Biederman | df75e77 | 2016-09-22 13:08:36 -0500 | [diff] [blame] | 380 | return ERR_PTR(-ENOSPC); |
Eric W. Biederman | 7032866 | 2016-08-08 14:33:23 -0500 | [diff] [blame] | 381 | |
Alexey Dobriyan | 088eb2d9 | 2009-05-04 11:12:14 -0700 | [diff] [blame] | 382 | net = net_alloc(); |
Eric W. Biederman | 7032866 | 2016-08-08 14:33:23 -0500 | [diff] [blame] | 383 | if (!net) { |
| 384 | dec_net_namespaces(ucounts); |
Alexey Dobriyan | 088eb2d9 | 2009-05-04 11:12:14 -0700 | [diff] [blame] | 385 | return ERR_PTR(-ENOMEM); |
Eric W. Biederman | 7032866 | 2016-08-08 14:33:23 -0500 | [diff] [blame] | 386 | } |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 387 | |
| 388 | get_user_ns(user_ns); |
| 389 | |
Andrey Vagin | 7281a66 | 2016-10-20 19:45:43 -0700 | [diff] [blame] | 390 | rv = mutex_lock_killable(&net_mutex); |
| 391 | if (rv < 0) { |
| 392 | net_free(net); |
| 393 | dec_net_namespaces(ucounts); |
| 394 | put_user_ns(user_ns); |
| 395 | return ERR_PTR(rv); |
| 396 | } |
| 397 | |
Eric W. Biederman | 7032866 | 2016-08-08 14:33:23 -0500 | [diff] [blame] | 398 | net->ucounts = ucounts; |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 399 | rv = setup_net(net, user_ns); |
Alexey Dobriyan | 088eb2d9 | 2009-05-04 11:12:14 -0700 | [diff] [blame] | 400 | if (rv == 0) { |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 401 | rtnl_lock(); |
Johannes Berg | 11a28d3 | 2009-07-10 09:51:33 +0000 | [diff] [blame] | 402 | list_add_tail_rcu(&net->list, &net_namespace_list); |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 403 | rtnl_unlock(); |
| 404 | } |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 405 | mutex_unlock(&net_mutex); |
Alexey Dobriyan | 088eb2d9 | 2009-05-04 11:12:14 -0700 | [diff] [blame] | 406 | if (rv < 0) { |
Eric W. Biederman | 7032866 | 2016-08-08 14:33:23 -0500 | [diff] [blame] | 407 | dec_net_namespaces(ucounts); |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 408 | put_user_ns(user_ns); |
Al Viro | a685e08 | 2011-06-08 21:13:01 -0400 | [diff] [blame] | 409 | net_drop_ns(net); |
Alexey Dobriyan | 088eb2d9 | 2009-05-04 11:12:14 -0700 | [diff] [blame] | 410 | return ERR_PTR(rv); |
| 411 | } |
| 412 | return net; |
| 413 | } |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 414 | |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 415 | static DEFINE_SPINLOCK(cleanup_list_lock); |
| 416 | static LIST_HEAD(cleanup_list); /* Must hold cleanup_list_lock to touch */ |
| 417 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 418 | static void cleanup_net(struct work_struct *work) |
| 419 | { |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 420 | const struct pernet_operations *ops; |
Nicolas Dichtel | 6d458f5 | 2015-04-03 12:02:36 +0200 | [diff] [blame] | 421 | struct net *net, *tmp; |
xiao jin | 1818ce4 | 2014-04-25 08:50:54 +0800 | [diff] [blame] | 422 | struct list_head net_kill_list; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 423 | LIST_HEAD(net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 424 | |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 425 | /* Atomically snapshot the list of namespaces to cleanup */ |
| 426 | spin_lock_irq(&cleanup_list_lock); |
| 427 | list_replace_init(&cleanup_list, &net_kill_list); |
| 428 | spin_unlock_irq(&cleanup_list_lock); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 429 | |
| 430 | mutex_lock(&net_mutex); |
| 431 | |
| 432 | /* Don't let anyone else find us. */ |
Eric W. Biederman | f4618d3 | 2007-09-26 22:40:08 -0700 | [diff] [blame] | 433 | rtnl_lock(); |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 434 | list_for_each_entry(net, &net_kill_list, cleanup_list) { |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 435 | list_del_rcu(&net->list); |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 436 | list_add_tail(&net->exit_list, &net_exit_list); |
Nicolas Dichtel | 6d458f5 | 2015-04-03 12:02:36 +0200 | [diff] [blame] | 437 | for_each_net(tmp) { |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 438 | int id; |
Nicolas Dichtel | 6d458f5 | 2015-04-03 12:02:36 +0200 | [diff] [blame] | 439 | |
Paul Moore | fba143c | 2016-11-29 16:57:48 -0500 | [diff] [blame] | 440 | spin_lock_bh(&tmp->nsid_lock); |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 441 | id = __peernet2id(tmp, net); |
| 442 | if (id >= 0) |
Nicolas Dichtel | 6d458f5 | 2015-04-03 12:02:36 +0200 | [diff] [blame] | 443 | idr_remove(&tmp->netns_ids, id); |
Paul Moore | fba143c | 2016-11-29 16:57:48 -0500 | [diff] [blame] | 444 | spin_unlock_bh(&tmp->nsid_lock); |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 445 | if (id >= 0) |
| 446 | rtnl_net_notifyid(tmp, RTM_DELNSID, id); |
Nicolas Dichtel | 6d458f5 | 2015-04-03 12:02:36 +0200 | [diff] [blame] | 447 | } |
Paul Moore | fba143c | 2016-11-29 16:57:48 -0500 | [diff] [blame] | 448 | spin_lock_bh(&net->nsid_lock); |
Nicolas Dichtel | 6d458f5 | 2015-04-03 12:02:36 +0200 | [diff] [blame] | 449 | idr_destroy(&net->netns_ids); |
Paul Moore | fba143c | 2016-11-29 16:57:48 -0500 | [diff] [blame] | 450 | spin_unlock_bh(&net->nsid_lock); |
Nicolas Dichtel | 6d458f5 | 2015-04-03 12:02:36 +0200 | [diff] [blame] | 451 | |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 452 | } |
Eric W. Biederman | f4618d3 | 2007-09-26 22:40:08 -0700 | [diff] [blame] | 453 | rtnl_unlock(); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 454 | |
Johannes Berg | 11a28d3 | 2009-07-10 09:51:33 +0000 | [diff] [blame] | 455 | /* |
| 456 | * Another CPU might be rcu-iterating the list, wait for it. |
| 457 | * This needs to be before calling the exit() notifiers, so |
| 458 | * the rcu_barrier() below isn't sufficient alone. |
| 459 | */ |
| 460 | synchronize_rcu(); |
| 461 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 462 | /* Run all of the network namespace exit methods */ |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 463 | list_for_each_entry_reverse(ops, &pernet_list, list) |
| 464 | ops_exit_list(ops, &net_exit_list); |
| 465 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 466 | /* Free the net generic variables */ |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 467 | list_for_each_entry_reverse(ops, &pernet_list, list) |
| 468 | ops_free_list(ops, &net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 469 | |
| 470 | mutex_unlock(&net_mutex); |
| 471 | |
| 472 | /* Ensure there are no outstanding rcu callbacks using this |
| 473 | * network namespace. |
| 474 | */ |
| 475 | rcu_barrier(); |
| 476 | |
| 477 | /* Finally it is safe to free my network namespace structure */ |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 478 | list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) { |
| 479 | list_del_init(&net->exit_list); |
Eric W. Biederman | 7032866 | 2016-08-08 14:33:23 -0500 | [diff] [blame] | 480 | dec_net_namespaces(net->ucounts); |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 481 | put_user_ns(net->user_ns); |
Al Viro | a685e08 | 2011-06-08 21:13:01 -0400 | [diff] [blame] | 482 | net_drop_ns(net); |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 483 | } |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 484 | } |
Florian Westphal | 7866cc5 | 2017-05-30 11:38:12 +0200 | [diff] [blame^] | 485 | |
| 486 | /** |
| 487 | * net_ns_barrier - wait until concurrent net_cleanup_work is done |
| 488 | * |
| 489 | * cleanup_net runs from work queue and will first remove namespaces |
| 490 | * from the global list, then run net exit functions. |
| 491 | * |
| 492 | * Call this in module exit path to make sure that all netns |
| 493 | * ->exit ops have been invoked before the function is removed. |
| 494 | */ |
| 495 | void net_ns_barrier(void) |
| 496 | { |
| 497 | mutex_lock(&net_mutex); |
| 498 | mutex_unlock(&net_mutex); |
| 499 | } |
| 500 | EXPORT_SYMBOL(net_ns_barrier); |
| 501 | |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 502 | static DECLARE_WORK(net_cleanup_work, cleanup_net); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 503 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 504 | void __put_net(struct net *net) |
| 505 | { |
| 506 | /* Cleanup the network namespace in process context */ |
Eric W. Biederman | 2b035b3 | 2009-11-29 22:25:27 +0000 | [diff] [blame] | 507 | unsigned long flags; |
| 508 | |
| 509 | spin_lock_irqsave(&cleanup_list_lock, flags); |
| 510 | list_add(&net->cleanup_list, &cleanup_list); |
| 511 | spin_unlock_irqrestore(&cleanup_list_lock, flags); |
| 512 | |
| 513 | queue_work(netns_wq, &net_cleanup_work); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 514 | } |
| 515 | EXPORT_SYMBOL_GPL(__put_net); |
| 516 | |
Stephen Rothwell | 956c920 | 2011-05-12 13:51:13 +1000 | [diff] [blame] | 517 | struct net *get_net_ns_by_fd(int fd) |
| 518 | { |
Stephen Rothwell | 956c920 | 2011-05-12 13:51:13 +1000 | [diff] [blame] | 519 | struct file *file; |
Al Viro | 33c4294 | 2014-11-01 02:32:53 -0400 | [diff] [blame] | 520 | struct ns_common *ns; |
Stephen Rothwell | 956c920 | 2011-05-12 13:51:13 +1000 | [diff] [blame] | 521 | struct net *net; |
| 522 | |
Stephen Rothwell | 956c920 | 2011-05-12 13:51:13 +1000 | [diff] [blame] | 523 | file = proc_ns_fget(fd); |
Al Viro | c316e6a | 2011-06-05 00:37:35 +0000 | [diff] [blame] | 524 | if (IS_ERR(file)) |
| 525 | return ERR_CAST(file); |
Stephen Rothwell | 956c920 | 2011-05-12 13:51:13 +1000 | [diff] [blame] | 526 | |
Al Viro | f77c801 | 2014-11-01 03:13:17 -0400 | [diff] [blame] | 527 | ns = get_proc_ns(file_inode(file)); |
Al Viro | 33c4294 | 2014-11-01 02:32:53 -0400 | [diff] [blame] | 528 | if (ns->ops == &netns_operations) |
| 529 | net = get_net(container_of(ns, struct net, ns)); |
Al Viro | c316e6a | 2011-06-05 00:37:35 +0000 | [diff] [blame] | 530 | else |
| 531 | net = ERR_PTR(-EINVAL); |
Stephen Rothwell | 956c920 | 2011-05-12 13:51:13 +1000 | [diff] [blame] | 532 | |
Al Viro | c316e6a | 2011-06-05 00:37:35 +0000 | [diff] [blame] | 533 | fput(file); |
Stephen Rothwell | 956c920 | 2011-05-12 13:51:13 +1000 | [diff] [blame] | 534 | return net; |
| 535 | } |
| 536 | |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 537 | #else |
Stephen Rothwell | 956c920 | 2011-05-12 13:51:13 +1000 | [diff] [blame] | 538 | struct net *get_net_ns_by_fd(int fd) |
| 539 | { |
| 540 | return ERR_PTR(-EINVAL); |
| 541 | } |
Pavel Emelyanov | 6a1a3b9 | 2007-11-01 00:44:50 -0700 | [diff] [blame] | 542 | #endif |
Vadim Kochan | 4b681c8 | 2015-01-12 16:34:05 +0200 | [diff] [blame] | 543 | EXPORT_SYMBOL_GPL(get_net_ns_by_fd); |
Eric W. Biederman | 9dd776b | 2007-09-26 22:04:26 -0700 | [diff] [blame] | 544 | |
Johannes Berg | 30ffee8 | 2009-07-10 09:51:35 +0000 | [diff] [blame] | 545 | struct net *get_net_ns_by_pid(pid_t pid) |
| 546 | { |
| 547 | struct task_struct *tsk; |
| 548 | struct net *net; |
| 549 | |
| 550 | /* Lookup the network namespace */ |
| 551 | net = ERR_PTR(-ESRCH); |
| 552 | rcu_read_lock(); |
| 553 | tsk = find_task_by_vpid(pid); |
| 554 | if (tsk) { |
| 555 | struct nsproxy *nsproxy; |
Eric W. Biederman | 728dba3 | 2014-02-03 19:13:49 -0800 | [diff] [blame] | 556 | task_lock(tsk); |
| 557 | nsproxy = tsk->nsproxy; |
Johannes Berg | 30ffee8 | 2009-07-10 09:51:35 +0000 | [diff] [blame] | 558 | if (nsproxy) |
| 559 | net = get_net(nsproxy->net_ns); |
Eric W. Biederman | 728dba3 | 2014-02-03 19:13:49 -0800 | [diff] [blame] | 560 | task_unlock(tsk); |
Johannes Berg | 30ffee8 | 2009-07-10 09:51:35 +0000 | [diff] [blame] | 561 | } |
| 562 | rcu_read_unlock(); |
| 563 | return net; |
| 564 | } |
| 565 | EXPORT_SYMBOL_GPL(get_net_ns_by_pid); |
| 566 | |
Eric W. Biederman | 98f842e | 2011-06-15 10:21:48 -0700 | [diff] [blame] | 567 | static __net_init int net_ns_net_init(struct net *net) |
| 568 | { |
Al Viro | 33c4294 | 2014-11-01 02:32:53 -0400 | [diff] [blame] | 569 | #ifdef CONFIG_NET_NS |
| 570 | net->ns.ops = &netns_operations; |
| 571 | #endif |
Al Viro | 6344c43 | 2014-11-01 00:45:45 -0400 | [diff] [blame] | 572 | return ns_alloc_inum(&net->ns); |
Eric W. Biederman | 98f842e | 2011-06-15 10:21:48 -0700 | [diff] [blame] | 573 | } |
| 574 | |
| 575 | static __net_exit void net_ns_net_exit(struct net *net) |
| 576 | { |
Al Viro | 6344c43 | 2014-11-01 00:45:45 -0400 | [diff] [blame] | 577 | ns_free_inum(&net->ns); |
Eric W. Biederman | 98f842e | 2011-06-15 10:21:48 -0700 | [diff] [blame] | 578 | } |
| 579 | |
| 580 | static struct pernet_operations __net_initdata net_ns_ops = { |
| 581 | .init = net_ns_net_init, |
| 582 | .exit = net_ns_net_exit, |
| 583 | }; |
| 584 | |
stephen hemminger | 3ee5256 | 2016-08-31 15:17:49 -0700 | [diff] [blame] | 585 | static const struct nla_policy rtnl_net_policy[NETNSA_MAX + 1] = { |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 586 | [NETNSA_NONE] = { .type = NLA_UNSPEC }, |
| 587 | [NETNSA_NSID] = { .type = NLA_S32 }, |
| 588 | [NETNSA_PID] = { .type = NLA_U32 }, |
| 589 | [NETNSA_FD] = { .type = NLA_U32 }, |
| 590 | }; |
| 591 | |
David Ahern | c21ef3e | 2017-04-16 09:48:24 -0700 | [diff] [blame] | 592 | static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 593 | struct netlink_ext_ack *extack) |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 594 | { |
| 595 | struct net *net = sock_net(skb->sk); |
| 596 | struct nlattr *tb[NETNSA_MAX + 1]; |
| 597 | struct net *peer; |
| 598 | int nsid, err; |
| 599 | |
| 600 | err = nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, NETNSA_MAX, |
David Ahern | c21ef3e | 2017-04-16 09:48:24 -0700 | [diff] [blame] | 601 | rtnl_net_policy, extack); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 602 | if (err < 0) |
| 603 | return err; |
| 604 | if (!tb[NETNSA_NSID]) |
| 605 | return -EINVAL; |
| 606 | nsid = nla_get_s32(tb[NETNSA_NSID]); |
| 607 | |
| 608 | if (tb[NETNSA_PID]) |
| 609 | peer = get_net_ns_by_pid(nla_get_u32(tb[NETNSA_PID])); |
| 610 | else if (tb[NETNSA_FD]) |
| 611 | peer = get_net_ns_by_fd(nla_get_u32(tb[NETNSA_FD])); |
| 612 | else |
| 613 | return -EINVAL; |
| 614 | if (IS_ERR(peer)) |
| 615 | return PTR_ERR(peer); |
| 616 | |
Paul Moore | fba143c | 2016-11-29 16:57:48 -0500 | [diff] [blame] | 617 | spin_lock_bh(&net->nsid_lock); |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 618 | if (__peernet2id(net, peer) >= 0) { |
Paul Moore | fba143c | 2016-11-29 16:57:48 -0500 | [diff] [blame] | 619 | spin_unlock_bh(&net->nsid_lock); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 620 | err = -EEXIST; |
| 621 | goto out; |
| 622 | } |
| 623 | |
| 624 | err = alloc_netid(net, peer, nsid); |
Paul Moore | fba143c | 2016-11-29 16:57:48 -0500 | [diff] [blame] | 625 | spin_unlock_bh(&net->nsid_lock); |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 626 | if (err >= 0) { |
| 627 | rtnl_net_notifyid(net, RTM_NEWNSID, err); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 628 | err = 0; |
Nicolas Dichtel | 3138dbf | 2015-05-07 11:02:50 +0200 | [diff] [blame] | 629 | } |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 630 | out: |
| 631 | put_net(peer); |
| 632 | return err; |
| 633 | } |
| 634 | |
| 635 | static int rtnl_net_get_size(void) |
| 636 | { |
| 637 | return NLMSG_ALIGN(sizeof(struct rtgenmsg)) |
| 638 | + nla_total_size(sizeof(s32)) /* NETNSA_NSID */ |
| 639 | ; |
| 640 | } |
| 641 | |
| 642 | 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] | 643 | int cmd, struct net *net, int nsid) |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 644 | { |
| 645 | struct nlmsghdr *nlh; |
| 646 | struct rtgenmsg *rth; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 647 | |
| 648 | nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rth), flags); |
| 649 | if (!nlh) |
| 650 | return -EMSGSIZE; |
| 651 | |
| 652 | rth = nlmsg_data(nlh); |
| 653 | rth->rtgen_family = AF_UNSPEC; |
| 654 | |
Nicolas Dichtel | cab3c8e | 2015-05-07 11:02:48 +0200 | [diff] [blame] | 655 | if (nla_put_s32(skb, NETNSA_NSID, nsid)) |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 656 | goto nla_put_failure; |
| 657 | |
| 658 | nlmsg_end(skb, nlh); |
| 659 | return 0; |
| 660 | |
| 661 | nla_put_failure: |
| 662 | nlmsg_cancel(skb, nlh); |
| 663 | return -EMSGSIZE; |
| 664 | } |
| 665 | |
David Ahern | c21ef3e | 2017-04-16 09:48:24 -0700 | [diff] [blame] | 666 | static int rtnl_net_getid(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 667 | struct netlink_ext_ack *extack) |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 668 | { |
| 669 | struct net *net = sock_net(skb->sk); |
| 670 | struct nlattr *tb[NETNSA_MAX + 1]; |
| 671 | struct sk_buff *msg; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 672 | struct net *peer; |
Nicolas Dichtel | cab3c8e | 2015-05-07 11:02:48 +0200 | [diff] [blame] | 673 | int err, id; |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 674 | |
| 675 | err = nlmsg_parse(nlh, sizeof(struct rtgenmsg), tb, NETNSA_MAX, |
David Ahern | c21ef3e | 2017-04-16 09:48:24 -0700 | [diff] [blame] | 676 | rtnl_net_policy, extack); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 677 | if (err < 0) |
| 678 | return err; |
| 679 | if (tb[NETNSA_PID]) |
| 680 | peer = get_net_ns_by_pid(nla_get_u32(tb[NETNSA_PID])); |
| 681 | else if (tb[NETNSA_FD]) |
| 682 | peer = get_net_ns_by_fd(nla_get_u32(tb[NETNSA_FD])); |
| 683 | else |
| 684 | return -EINVAL; |
| 685 | |
| 686 | if (IS_ERR(peer)) |
| 687 | return PTR_ERR(peer); |
| 688 | |
| 689 | msg = nlmsg_new(rtnl_net_get_size(), GFP_KERNEL); |
| 690 | if (!msg) { |
| 691 | err = -ENOMEM; |
| 692 | goto out; |
| 693 | } |
| 694 | |
Nicolas Dichtel | 95f3841 | 2015-05-07 11:02:51 +0200 | [diff] [blame] | 695 | id = peernet2id(net, peer); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 696 | 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] | 697 | RTM_NEWNSID, net, id); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 698 | if (err < 0) |
| 699 | goto err_out; |
| 700 | |
| 701 | err = rtnl_unicast(msg, net, NETLINK_CB(skb).portid); |
| 702 | goto out; |
| 703 | |
| 704 | err_out: |
| 705 | nlmsg_free(msg); |
| 706 | out: |
| 707 | put_net(peer); |
| 708 | return err; |
| 709 | } |
| 710 | |
Nicolas Dichtel | a143c40 | 2015-04-07 11:51:54 +0200 | [diff] [blame] | 711 | struct rtnl_net_dump_cb { |
| 712 | struct net *net; |
| 713 | struct sk_buff *skb; |
| 714 | struct netlink_callback *cb; |
| 715 | int idx; |
| 716 | int s_idx; |
| 717 | }; |
| 718 | |
| 719 | static int rtnl_net_dumpid_one(int id, void *peer, void *data) |
| 720 | { |
| 721 | struct rtnl_net_dump_cb *net_cb = (struct rtnl_net_dump_cb *)data; |
| 722 | int ret; |
| 723 | |
| 724 | if (net_cb->idx < net_cb->s_idx) |
| 725 | goto cont; |
| 726 | |
| 727 | ret = rtnl_net_fill(net_cb->skb, NETLINK_CB(net_cb->cb->skb).portid, |
| 728 | net_cb->cb->nlh->nlmsg_seq, NLM_F_MULTI, |
Nicolas Dichtel | cab3c8e | 2015-05-07 11:02:48 +0200 | [diff] [blame] | 729 | RTM_NEWNSID, net_cb->net, id); |
Nicolas Dichtel | a143c40 | 2015-04-07 11:51:54 +0200 | [diff] [blame] | 730 | if (ret < 0) |
| 731 | return ret; |
| 732 | |
| 733 | cont: |
| 734 | net_cb->idx++; |
| 735 | return 0; |
| 736 | } |
| 737 | |
| 738 | static int rtnl_net_dumpid(struct sk_buff *skb, struct netlink_callback *cb) |
| 739 | { |
| 740 | struct net *net = sock_net(skb->sk); |
| 741 | struct rtnl_net_dump_cb net_cb = { |
| 742 | .net = net, |
| 743 | .skb = skb, |
| 744 | .cb = cb, |
| 745 | .idx = 0, |
| 746 | .s_idx = cb->args[0], |
| 747 | }; |
| 748 | |
Paul Moore | fba143c | 2016-11-29 16:57:48 -0500 | [diff] [blame] | 749 | spin_lock_bh(&net->nsid_lock); |
Nicolas Dichtel | a143c40 | 2015-04-07 11:51:54 +0200 | [diff] [blame] | 750 | idr_for_each(&net->netns_ids, rtnl_net_dumpid_one, &net_cb); |
Paul Moore | fba143c | 2016-11-29 16:57:48 -0500 | [diff] [blame] | 751 | spin_unlock_bh(&net->nsid_lock); |
Nicolas Dichtel | a143c40 | 2015-04-07 11:51:54 +0200 | [diff] [blame] | 752 | |
| 753 | cb->args[0] = net_cb.idx; |
| 754 | return skb->len; |
| 755 | } |
| 756 | |
Nicolas Dichtel | cab3c8e | 2015-05-07 11:02:48 +0200 | [diff] [blame] | 757 | static void rtnl_net_notifyid(struct net *net, int cmd, int id) |
Nicolas Dichtel | 9a96345 | 2015-04-07 11:51:53 +0200 | [diff] [blame] | 758 | { |
| 759 | struct sk_buff *msg; |
| 760 | int err = -ENOMEM; |
| 761 | |
| 762 | msg = nlmsg_new(rtnl_net_get_size(), GFP_KERNEL); |
| 763 | if (!msg) |
| 764 | goto out; |
| 765 | |
Nicolas Dichtel | cab3c8e | 2015-05-07 11:02:48 +0200 | [diff] [blame] | 766 | err = rtnl_net_fill(msg, 0, 0, 0, cmd, net, id); |
Nicolas Dichtel | 9a96345 | 2015-04-07 11:51:53 +0200 | [diff] [blame] | 767 | if (err < 0) |
| 768 | goto err_out; |
| 769 | |
| 770 | rtnl_notify(msg, net, 0, RTNLGRP_NSID, NULL, 0); |
| 771 | return; |
| 772 | |
| 773 | err_out: |
| 774 | nlmsg_free(msg); |
| 775 | out: |
| 776 | rtnl_set_sk_err(net, RTNLGRP_NSID, err); |
| 777 | } |
| 778 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 779 | static int __init net_ns_init(void) |
| 780 | { |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 781 | struct net_generic *ng; |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 782 | |
Pavel Emelyanov | d57a921 | 2007-11-01 00:46:50 -0700 | [diff] [blame] | 783 | #ifdef CONFIG_NET_NS |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 784 | net_cachep = kmem_cache_create("net_namespace", sizeof(struct net), |
| 785 | SMP_CACHE_BYTES, |
| 786 | SLAB_PANIC, NULL); |
Benjamin Thery | 3ef1355 | 2007-11-19 23:18:16 -0800 | [diff] [blame] | 787 | |
| 788 | /* Create workqueue for cleanup */ |
| 789 | netns_wq = create_singlethread_workqueue("netns"); |
| 790 | if (!netns_wq) |
| 791 | panic("Could not create netns workq"); |
Pavel Emelyanov | d57a921 | 2007-11-01 00:46:50 -0700 | [diff] [blame] | 792 | #endif |
Benjamin Thery | 3ef1355 | 2007-11-19 23:18:16 -0800 | [diff] [blame] | 793 | |
Daniel Lezcano | 486a87f | 2009-02-22 00:07:53 -0800 | [diff] [blame] | 794 | ng = net_alloc_generic(); |
| 795 | if (!ng) |
| 796 | panic("Could not allocate generic netns"); |
| 797 | |
| 798 | rcu_assign_pointer(init_net.gen, ng); |
| 799 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 800 | mutex_lock(&net_mutex); |
Eric W. Biederman | 038e733 | 2012-06-14 02:31:10 -0700 | [diff] [blame] | 801 | if (setup_net(&init_net, &init_user_ns)) |
Stephen Hemminger | ca0f311 | 2009-05-21 15:10:31 -0700 | [diff] [blame] | 802 | panic("Could not setup the initial network namespace"); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 803 | |
Dmitry Torokhov | f8c46cb | 2016-08-10 14:36:00 -0700 | [diff] [blame] | 804 | init_net_initialized = true; |
| 805 | |
Eric W. Biederman | f4618d3 | 2007-09-26 22:40:08 -0700 | [diff] [blame] | 806 | rtnl_lock(); |
Johannes Berg | 11a28d3 | 2009-07-10 09:51:33 +0000 | [diff] [blame] | 807 | list_add_tail_rcu(&init_net.list, &net_namespace_list); |
Eric W. Biederman | f4618d3 | 2007-09-26 22:40:08 -0700 | [diff] [blame] | 808 | rtnl_unlock(); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 809 | |
| 810 | mutex_unlock(&net_mutex); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 811 | |
Eric W. Biederman | 98f842e | 2011-06-15 10:21:48 -0700 | [diff] [blame] | 812 | register_pernet_subsys(&net_ns_ops); |
| 813 | |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 814 | rtnl_register(PF_UNSPEC, RTM_NEWNSID, rtnl_net_newid, NULL, NULL); |
Nicolas Dichtel | a143c40 | 2015-04-07 11:51:54 +0200 | [diff] [blame] | 815 | rtnl_register(PF_UNSPEC, RTM_GETNSID, rtnl_net_getid, rtnl_net_dumpid, |
| 816 | NULL); |
Nicolas Dichtel | 0c7aecd | 2015-01-15 15:11:15 +0100 | [diff] [blame] | 817 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 818 | return 0; |
| 819 | } |
| 820 | |
| 821 | pure_initcall(net_ns_init); |
| 822 | |
Denis V. Lunev | ed160e8 | 2007-11-13 03:23:21 -0800 | [diff] [blame] | 823 | #ifdef CONFIG_NET_NS |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 824 | static int __register_pernet_operations(struct list_head *list, |
| 825 | struct pernet_operations *ops) |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 826 | { |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 827 | struct net *net; |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 828 | int error; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 829 | LIST_HEAD(net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 830 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 831 | list_add_tail(&ops->list, list); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 832 | if (ops->init || (ops->id && ops->size)) { |
Pavel Emelyanov | 1dba323 | 2007-11-01 00:42:43 -0700 | [diff] [blame] | 833 | for_each_net(net) { |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 834 | error = ops_init(ops, net); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 835 | if (error) |
| 836 | goto out_undo; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 837 | list_add_tail(&net->exit_list, &net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 838 | } |
| 839 | } |
Pavel Emelyanov | 1dba323 | 2007-11-01 00:42:43 -0700 | [diff] [blame] | 840 | return 0; |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 841 | |
| 842 | out_undo: |
| 843 | /* If I have an error cleanup all namespaces I initialized */ |
| 844 | list_del(&ops->list); |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 845 | ops_exit_list(ops, &net_exit_list); |
| 846 | ops_free_list(ops, &net_exit_list); |
Pavel Emelyanov | 1dba323 | 2007-11-01 00:42:43 -0700 | [diff] [blame] | 847 | return error; |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 848 | } |
| 849 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 850 | static void __unregister_pernet_operations(struct pernet_operations *ops) |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 851 | { |
| 852 | struct net *net; |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 853 | LIST_HEAD(net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 854 | |
| 855 | list_del(&ops->list); |
Eric W. Biederman | 72ad937 | 2009-12-03 02:29:03 +0000 | [diff] [blame] | 856 | for_each_net(net) |
| 857 | list_add_tail(&net->exit_list, &net_exit_list); |
| 858 | ops_exit_list(ops, &net_exit_list); |
| 859 | ops_free_list(ops, &net_exit_list); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 860 | } |
| 861 | |
Denis V. Lunev | ed160e8 | 2007-11-13 03:23:21 -0800 | [diff] [blame] | 862 | #else |
| 863 | |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 864 | static int __register_pernet_operations(struct list_head *list, |
| 865 | struct pernet_operations *ops) |
| 866 | { |
Dmitry Torokhov | f8c46cb | 2016-08-10 14:36:00 -0700 | [diff] [blame] | 867 | if (!init_net_initialized) { |
| 868 | list_add_tail(&ops->list, list); |
| 869 | return 0; |
| 870 | } |
| 871 | |
Julian Anastasov | b922934 | 2012-04-16 04:43:15 +0000 | [diff] [blame] | 872 | return ops_init(ops, &init_net); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 873 | } |
| 874 | |
| 875 | static void __unregister_pernet_operations(struct pernet_operations *ops) |
| 876 | { |
Dmitry Torokhov | f8c46cb | 2016-08-10 14:36:00 -0700 | [diff] [blame] | 877 | if (!init_net_initialized) { |
| 878 | list_del(&ops->list); |
| 879 | } else { |
| 880 | LIST_HEAD(net_exit_list); |
| 881 | list_add(&init_net.exit_list, &net_exit_list); |
| 882 | ops_exit_list(ops, &net_exit_list); |
| 883 | ops_free_list(ops, &net_exit_list); |
| 884 | } |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 885 | } |
| 886 | |
| 887 | #endif /* CONFIG_NET_NS */ |
| 888 | |
| 889 | static DEFINE_IDA(net_generic_ids); |
| 890 | |
Denis V. Lunev | ed160e8 | 2007-11-13 03:23:21 -0800 | [diff] [blame] | 891 | static int register_pernet_operations(struct list_head *list, |
| 892 | struct pernet_operations *ops) |
| 893 | { |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 894 | int error; |
| 895 | |
| 896 | if (ops->id) { |
| 897 | again: |
Alexey Dobriyan | 6af2d5f | 2016-12-02 04:21:32 +0300 | [diff] [blame] | 898 | error = ida_get_new_above(&net_generic_ids, MIN_PERNET_OPS_ID, ops->id); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 899 | if (error < 0) { |
| 900 | if (error == -EAGAIN) { |
| 901 | ida_pre_get(&net_generic_ids, GFP_KERNEL); |
| 902 | goto again; |
| 903 | } |
| 904 | return error; |
| 905 | } |
Alexey Dobriyan | 6af2d5f | 2016-12-02 04:21:32 +0300 | [diff] [blame] | 906 | max_gen_ptrs = max(max_gen_ptrs, *ops->id + 1); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 907 | } |
| 908 | error = __register_pernet_operations(list, ops); |
Eric W. Biederman | 3a765ed | 2009-12-03 02:29:06 +0000 | [diff] [blame] | 909 | if (error) { |
| 910 | rcu_barrier(); |
| 911 | if (ops->id) |
| 912 | ida_remove(&net_generic_ids, *ops->id); |
| 913 | } |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 914 | |
| 915 | return error; |
Denis V. Lunev | ed160e8 | 2007-11-13 03:23:21 -0800 | [diff] [blame] | 916 | } |
| 917 | |
| 918 | static void unregister_pernet_operations(struct pernet_operations *ops) |
| 919 | { |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 920 | |
| 921 | __unregister_pernet_operations(ops); |
Eric W. Biederman | 3a765ed | 2009-12-03 02:29:06 +0000 | [diff] [blame] | 922 | rcu_barrier(); |
Eric W. Biederman | f875bae | 2009-11-29 22:25:28 +0000 | [diff] [blame] | 923 | if (ops->id) |
| 924 | ida_remove(&net_generic_ids, *ops->id); |
Denis V. Lunev | ed160e8 | 2007-11-13 03:23:21 -0800 | [diff] [blame] | 925 | } |
Pavel Emelyanov | c93cf61 | 2008-04-15 00:35:23 -0700 | [diff] [blame] | 926 | |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 927 | /** |
| 928 | * register_pernet_subsys - register a network namespace subsystem |
| 929 | * @ops: pernet operations structure for the subsystem |
| 930 | * |
| 931 | * Register a subsystem which has init and exit functions |
| 932 | * that are called when network namespaces are created and |
| 933 | * destroyed respectively. |
| 934 | * |
| 935 | * When registered all network namespace init functions are |
| 936 | * called for every existing network namespace. Allowing kernel |
| 937 | * modules to have a race free view of the set of network namespaces. |
| 938 | * |
| 939 | * When a new network namespace is created all of the init |
| 940 | * methods are called in the order in which they were registered. |
| 941 | * |
| 942 | * When a network namespace is destroyed all of the exit methods |
| 943 | * are called in the reverse of the order with which they were |
| 944 | * registered. |
| 945 | */ |
| 946 | int register_pernet_subsys(struct pernet_operations *ops) |
| 947 | { |
| 948 | int error; |
| 949 | mutex_lock(&net_mutex); |
| 950 | error = register_pernet_operations(first_device, ops); |
| 951 | mutex_unlock(&net_mutex); |
| 952 | return error; |
| 953 | } |
| 954 | EXPORT_SYMBOL_GPL(register_pernet_subsys); |
| 955 | |
| 956 | /** |
| 957 | * unregister_pernet_subsys - unregister a network namespace subsystem |
| 958 | * @ops: pernet operations structure to manipulate |
| 959 | * |
| 960 | * Remove the pernet operations structure from the list to be |
Oliver Pinter | 53379e5 | 2008-02-03 17:56:48 +0200 | [diff] [blame] | 961 | * used when network namespaces are created or destroyed. In |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 962 | * addition run the exit method for all existing network |
| 963 | * namespaces. |
| 964 | */ |
Jiri Pirko | b3c981d | 2010-04-25 00:49:56 -0700 | [diff] [blame] | 965 | void unregister_pernet_subsys(struct pernet_operations *ops) |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 966 | { |
| 967 | mutex_lock(&net_mutex); |
Jiri Pirko | b3c981d | 2010-04-25 00:49:56 -0700 | [diff] [blame] | 968 | unregister_pernet_operations(ops); |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 969 | mutex_unlock(&net_mutex); |
| 970 | } |
| 971 | EXPORT_SYMBOL_GPL(unregister_pernet_subsys); |
| 972 | |
| 973 | /** |
| 974 | * register_pernet_device - register a network namespace device |
| 975 | * @ops: pernet operations structure for the subsystem |
| 976 | * |
| 977 | * Register a device which has init and exit functions |
| 978 | * that are called when network namespaces are created and |
| 979 | * destroyed respectively. |
| 980 | * |
| 981 | * When registered all network namespace init functions are |
| 982 | * called for every existing network namespace. Allowing kernel |
| 983 | * modules to have a race free view of the set of network namespaces. |
| 984 | * |
| 985 | * When a new network namespace is created all of the init |
| 986 | * methods are called in the order in which they were registered. |
| 987 | * |
| 988 | * When a network namespace is destroyed all of the exit methods |
| 989 | * are called in the reverse of the order with which they were |
| 990 | * registered. |
| 991 | */ |
| 992 | int register_pernet_device(struct pernet_operations *ops) |
| 993 | { |
| 994 | int error; |
| 995 | mutex_lock(&net_mutex); |
| 996 | error = register_pernet_operations(&pernet_list, ops); |
| 997 | if (!error && (first_device == &pernet_list)) |
| 998 | first_device = &ops->list; |
| 999 | mutex_unlock(&net_mutex); |
| 1000 | return error; |
| 1001 | } |
| 1002 | EXPORT_SYMBOL_GPL(register_pernet_device); |
| 1003 | |
| 1004 | /** |
| 1005 | * unregister_pernet_device - unregister a network namespace netdevice |
| 1006 | * @ops: pernet operations structure to manipulate |
| 1007 | * |
| 1008 | * Remove the pernet operations structure from the list to be |
Oliver Pinter | 53379e5 | 2008-02-03 17:56:48 +0200 | [diff] [blame] | 1009 | * used when network namespaces are created or destroyed. In |
Eric W. Biederman | 5f256be | 2007-09-12 11:50:50 +0200 | [diff] [blame] | 1010 | * addition run the exit method for all existing network |
| 1011 | * namespaces. |
| 1012 | */ |
| 1013 | void unregister_pernet_device(struct pernet_operations *ops) |
| 1014 | { |
| 1015 | mutex_lock(&net_mutex); |
| 1016 | if (&ops->list == first_device) |
| 1017 | first_device = first_device->next; |
| 1018 | unregister_pernet_operations(ops); |
| 1019 | mutex_unlock(&net_mutex); |
| 1020 | } |
| 1021 | EXPORT_SYMBOL_GPL(unregister_pernet_device); |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 1022 | |
| 1023 | #ifdef CONFIG_NET_NS |
Al Viro | 6496452 | 2014-11-01 00:37:32 -0400 | [diff] [blame] | 1024 | static struct ns_common *netns_get(struct task_struct *task) |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 1025 | { |
Eric W. Biederman | f063052 | 2011-05-04 17:51:50 -0700 | [diff] [blame] | 1026 | struct net *net = NULL; |
| 1027 | struct nsproxy *nsproxy; |
| 1028 | |
Eric W. Biederman | 728dba3 | 2014-02-03 19:13:49 -0800 | [diff] [blame] | 1029 | task_lock(task); |
| 1030 | nsproxy = task->nsproxy; |
Eric W. Biederman | f063052 | 2011-05-04 17:51:50 -0700 | [diff] [blame] | 1031 | if (nsproxy) |
| 1032 | net = get_net(nsproxy->net_ns); |
Eric W. Biederman | 728dba3 | 2014-02-03 19:13:49 -0800 | [diff] [blame] | 1033 | task_unlock(task); |
Eric W. Biederman | f063052 | 2011-05-04 17:51:50 -0700 | [diff] [blame] | 1034 | |
Al Viro | ff24870 | 2014-11-01 00:10:50 -0400 | [diff] [blame] | 1035 | return net ? &net->ns : NULL; |
| 1036 | } |
| 1037 | |
| 1038 | static inline struct net *to_net_ns(struct ns_common *ns) |
| 1039 | { |
| 1040 | return container_of(ns, struct net, ns); |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 1041 | } |
| 1042 | |
Al Viro | 6496452 | 2014-11-01 00:37:32 -0400 | [diff] [blame] | 1043 | static void netns_put(struct ns_common *ns) |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 1044 | { |
Al Viro | ff24870 | 2014-11-01 00:10:50 -0400 | [diff] [blame] | 1045 | put_net(to_net_ns(ns)); |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 1046 | } |
| 1047 | |
Al Viro | 6496452 | 2014-11-01 00:37:32 -0400 | [diff] [blame] | 1048 | static int netns_install(struct nsproxy *nsproxy, struct ns_common *ns) |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 1049 | { |
Al Viro | ff24870 | 2014-11-01 00:10:50 -0400 | [diff] [blame] | 1050 | struct net *net = to_net_ns(ns); |
Eric W. Biederman | 142e1d1 | 2012-07-26 01:13:20 -0700 | [diff] [blame] | 1051 | |
Eric W. Biederman | 5e4a084 | 2012-12-14 07:55:36 -0800 | [diff] [blame] | 1052 | if (!ns_capable(net->user_ns, CAP_SYS_ADMIN) || |
Eric W. Biederman | c7b96ac | 2013-03-20 12:49:49 -0700 | [diff] [blame] | 1053 | !ns_capable(current_user_ns(), CAP_SYS_ADMIN)) |
Eric W. Biederman | 142e1d1 | 2012-07-26 01:13:20 -0700 | [diff] [blame] | 1054 | return -EPERM; |
| 1055 | |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 1056 | put_net(nsproxy->net_ns); |
Eric W. Biederman | 142e1d1 | 2012-07-26 01:13:20 -0700 | [diff] [blame] | 1057 | nsproxy->net_ns = get_net(net); |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 1058 | return 0; |
| 1059 | } |
| 1060 | |
Andrey Vagin | bcac25a | 2016-09-06 00:47:13 -0700 | [diff] [blame] | 1061 | static struct user_namespace *netns_owner(struct ns_common *ns) |
| 1062 | { |
| 1063 | return to_net_ns(ns)->user_ns; |
| 1064 | } |
| 1065 | |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 1066 | const struct proc_ns_operations netns_operations = { |
| 1067 | .name = "net", |
| 1068 | .type = CLONE_NEWNET, |
| 1069 | .get = netns_get, |
| 1070 | .put = netns_put, |
| 1071 | .install = netns_install, |
Andrey Vagin | bcac25a | 2016-09-06 00:47:13 -0700 | [diff] [blame] | 1072 | .owner = netns_owner, |
Eric W. Biederman | 13b6f57 | 2010-03-07 18:14:23 -0800 | [diff] [blame] | 1073 | }; |
| 1074 | #endif |