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1380 lines
32 KiB
1380 lines
32 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/workqueue.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/cache.h> |
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#include <linux/slab.h> |
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#include <linux/list.h> |
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#include <linux/delay.h> |
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#include <linux/sched.h> |
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#include <linux/idr.h> |
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#include <linux/rculist.h> |
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#include <linux/nsproxy.h> |
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#include <linux/fs.h> |
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#include <linux/proc_ns.h> |
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#include <linux/file.h> |
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#include <linux/export.h> |
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#include <linux/user_namespace.h> |
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#include <linux/net_namespace.h> |
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#include <linux/sched/task.h> |
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#include <linux/uidgid.h> |
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#include <linux/cookie.h> |
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#include <net/sock.h> |
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#include <net/netlink.h> |
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#include <net/net_namespace.h> |
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#include <net/netns/generic.h> |
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/* |
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* Our network namespace constructor/destructor lists |
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*/ |
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static LIST_HEAD(pernet_list); |
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static struct list_head *first_device = &pernet_list; |
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LIST_HEAD(net_namespace_list); |
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EXPORT_SYMBOL_GPL(net_namespace_list); |
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/* Protects net_namespace_list. Nests iside rtnl_lock() */ |
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DECLARE_RWSEM(net_rwsem); |
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EXPORT_SYMBOL_GPL(net_rwsem); |
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#ifdef CONFIG_KEYS |
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static struct key_tag init_net_key_domain = { .usage = REFCOUNT_INIT(1) }; |
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#endif |
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struct net init_net = { |
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.ns.count = REFCOUNT_INIT(1), |
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.dev_base_head = LIST_HEAD_INIT(init_net.dev_base_head), |
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#ifdef CONFIG_KEYS |
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.key_domain = &init_net_key_domain, |
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#endif |
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}; |
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EXPORT_SYMBOL(init_net); |
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|
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static bool init_net_initialized; |
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/* |
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* pernet_ops_rwsem: protects: pernet_list, net_generic_ids, |
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* init_net_initialized and first_device pointer. |
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* This is internal net namespace object. Please, don't use it |
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* outside. |
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*/ |
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DECLARE_RWSEM(pernet_ops_rwsem); |
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EXPORT_SYMBOL_GPL(pernet_ops_rwsem); |
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#define MIN_PERNET_OPS_ID \ |
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((sizeof(struct net_generic) + sizeof(void *) - 1) / sizeof(void *)) |
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#define INITIAL_NET_GEN_PTRS 13 /* +1 for len +2 for rcu_head */ |
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static unsigned int max_gen_ptrs = INITIAL_NET_GEN_PTRS; |
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DEFINE_COOKIE(net_cookie); |
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static struct net_generic *net_alloc_generic(void) |
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{ |
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struct net_generic *ng; |
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unsigned int generic_size = offsetof(struct net_generic, ptr[max_gen_ptrs]); |
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ng = kzalloc(generic_size, GFP_KERNEL); |
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if (ng) |
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ng->s.len = max_gen_ptrs; |
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return ng; |
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} |
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static int net_assign_generic(struct net *net, unsigned int id, void *data) |
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{ |
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struct net_generic *ng, *old_ng; |
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|
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BUG_ON(id < MIN_PERNET_OPS_ID); |
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old_ng = rcu_dereference_protected(net->gen, |
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lockdep_is_held(&pernet_ops_rwsem)); |
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if (old_ng->s.len > id) { |
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old_ng->ptr[id] = data; |
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return 0; |
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} |
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ng = net_alloc_generic(); |
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if (ng == NULL) |
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return -ENOMEM; |
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|
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/* |
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* Some synchronisation notes: |
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* |
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* The net_generic explores the net->gen array inside rcu |
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* read section. Besides once set the net->gen->ptr[x] |
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* pointer never changes (see rules in netns/generic.h). |
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* |
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* That said, we simply duplicate this array and schedule |
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* the old copy for kfree after a grace period. |
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*/ |
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|
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memcpy(&ng->ptr[MIN_PERNET_OPS_ID], &old_ng->ptr[MIN_PERNET_OPS_ID], |
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(old_ng->s.len - MIN_PERNET_OPS_ID) * sizeof(void *)); |
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ng->ptr[id] = data; |
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rcu_assign_pointer(net->gen, ng); |
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kfree_rcu(old_ng, s.rcu); |
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return 0; |
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} |
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static int ops_init(const struct pernet_operations *ops, struct net *net) |
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{ |
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int err = -ENOMEM; |
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void *data = NULL; |
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|
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if (ops->id && ops->size) { |
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data = kzalloc(ops->size, GFP_KERNEL); |
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if (!data) |
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goto out; |
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err = net_assign_generic(net, *ops->id, data); |
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if (err) |
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goto cleanup; |
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} |
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err = 0; |
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if (ops->init) |
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err = ops->init(net); |
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if (!err) |
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return 0; |
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cleanup: |
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kfree(data); |
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out: |
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return err; |
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} |
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static void ops_free(const struct pernet_operations *ops, struct net *net) |
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{ |
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if (ops->id && ops->size) { |
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kfree(net_generic(net, *ops->id)); |
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} |
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} |
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static void ops_pre_exit_list(const struct pernet_operations *ops, |
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struct list_head *net_exit_list) |
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{ |
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struct net *net; |
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|
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if (ops->pre_exit) { |
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list_for_each_entry(net, net_exit_list, exit_list) |
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ops->pre_exit(net); |
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} |
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} |
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static void ops_exit_list(const struct pernet_operations *ops, |
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struct list_head *net_exit_list) |
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{ |
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struct net *net; |
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if (ops->exit) { |
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list_for_each_entry(net, net_exit_list, exit_list) |
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ops->exit(net); |
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} |
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if (ops->exit_batch) |
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ops->exit_batch(net_exit_list); |
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} |
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static void ops_free_list(const struct pernet_operations *ops, |
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struct list_head *net_exit_list) |
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{ |
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struct net *net; |
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if (ops->size && ops->id) { |
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list_for_each_entry(net, net_exit_list, exit_list) |
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ops_free(ops, net); |
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} |
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} |
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/* should be called with nsid_lock held */ |
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static int alloc_netid(struct net *net, struct net *peer, int reqid) |
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{ |
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int min = 0, max = 0; |
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|
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if (reqid >= 0) { |
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min = reqid; |
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max = reqid + 1; |
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} |
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return idr_alloc(&net->netns_ids, peer, min, max, GFP_ATOMIC); |
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} |
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|
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/* This function is used by idr_for_each(). If net is equal to peer, the |
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* function returns the id so that idr_for_each() stops. Because we cannot |
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* returns the id 0 (idr_for_each() will not stop), we return the magic value |
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* NET_ID_ZERO (-1) for it. |
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*/ |
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#define NET_ID_ZERO -1 |
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static int net_eq_idr(int id, void *net, void *peer) |
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{ |
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if (net_eq(net, peer)) |
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return id ? : NET_ID_ZERO; |
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return 0; |
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} |
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/* Must be called from RCU-critical section or with nsid_lock held */ |
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static int __peernet2id(const struct net *net, struct net *peer) |
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{ |
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int id = idr_for_each(&net->netns_ids, net_eq_idr, peer); |
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|
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/* Magic value for id 0. */ |
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if (id == NET_ID_ZERO) |
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return 0; |
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if (id > 0) |
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return id; |
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return NETNSA_NSID_NOT_ASSIGNED; |
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} |
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static void rtnl_net_notifyid(struct net *net, int cmd, int id, u32 portid, |
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struct nlmsghdr *nlh, gfp_t gfp); |
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/* This function returns the id of a peer netns. If no id is assigned, one will |
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* be allocated and returned. |
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*/ |
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int peernet2id_alloc(struct net *net, struct net *peer, gfp_t gfp) |
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{ |
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int id; |
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if (refcount_read(&net->ns.count) == 0) |
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return NETNSA_NSID_NOT_ASSIGNED; |
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spin_lock_bh(&net->nsid_lock); |
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id = __peernet2id(net, peer); |
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if (id >= 0) { |
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spin_unlock_bh(&net->nsid_lock); |
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return id; |
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} |
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|
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/* When peer is obtained from RCU lists, we may race with |
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* its cleanup. Check whether it's alive, and this guarantees |
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* we never hash a peer back to net->netns_ids, after it has |
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* just been idr_remove()'d from there in cleanup_net(). |
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*/ |
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if (!maybe_get_net(peer)) { |
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spin_unlock_bh(&net->nsid_lock); |
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return NETNSA_NSID_NOT_ASSIGNED; |
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} |
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id = alloc_netid(net, peer, -1); |
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spin_unlock_bh(&net->nsid_lock); |
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put_net(peer); |
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if (id < 0) |
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return NETNSA_NSID_NOT_ASSIGNED; |
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rtnl_net_notifyid(net, RTM_NEWNSID, id, 0, NULL, gfp); |
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return id; |
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} |
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EXPORT_SYMBOL_GPL(peernet2id_alloc); |
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|
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/* This function returns, if assigned, the id of a peer netns. */ |
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int peernet2id(const struct net *net, struct net *peer) |
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{ |
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int id; |
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rcu_read_lock(); |
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id = __peernet2id(net, peer); |
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rcu_read_unlock(); |
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return id; |
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} |
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EXPORT_SYMBOL(peernet2id); |
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/* This function returns true is the peer netns has an id assigned into the |
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* current netns. |
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*/ |
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bool peernet_has_id(const struct net *net, struct net *peer) |
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{ |
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return peernet2id(net, peer) >= 0; |
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} |
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struct net *get_net_ns_by_id(const struct net *net, int id) |
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{ |
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struct net *peer; |
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if (id < 0) |
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return NULL; |
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rcu_read_lock(); |
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peer = idr_find(&net->netns_ids, id); |
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if (peer) |
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peer = maybe_get_net(peer); |
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rcu_read_unlock(); |
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return peer; |
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} |
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/* |
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* setup_net runs the initializers for the network namespace object. |
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*/ |
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static __net_init int setup_net(struct net *net, struct user_namespace *user_ns) |
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{ |
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/* Must be called with pernet_ops_rwsem held */ |
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const struct pernet_operations *ops, *saved_ops; |
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int error = 0; |
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LIST_HEAD(net_exit_list); |
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refcount_set(&net->ns.count, 1); |
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refcount_set(&net->passive, 1); |
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get_random_bytes(&net->hash_mix, sizeof(u32)); |
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preempt_disable(); |
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net->net_cookie = gen_cookie_next(&net_cookie); |
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preempt_enable(); |
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net->dev_base_seq = 1; |
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net->user_ns = user_ns; |
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idr_init(&net->netns_ids); |
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spin_lock_init(&net->nsid_lock); |
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mutex_init(&net->ipv4.ra_mutex); |
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list_for_each_entry(ops, &pernet_list, list) { |
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error = ops_init(ops, net); |
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if (error < 0) |
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goto out_undo; |
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} |
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down_write(&net_rwsem); |
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list_add_tail_rcu(&net->list, &net_namespace_list); |
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up_write(&net_rwsem); |
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out: |
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return error; |
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out_undo: |
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/* Walk through the list backwards calling the exit functions |
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* for the pernet modules whose init functions did not fail. |
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*/ |
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list_add(&net->exit_list, &net_exit_list); |
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saved_ops = ops; |
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list_for_each_entry_continue_reverse(ops, &pernet_list, list) |
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ops_pre_exit_list(ops, &net_exit_list); |
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synchronize_rcu(); |
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ops = saved_ops; |
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list_for_each_entry_continue_reverse(ops, &pernet_list, list) |
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ops_exit_list(ops, &net_exit_list); |
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ops = saved_ops; |
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list_for_each_entry_continue_reverse(ops, &pernet_list, list) |
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ops_free_list(ops, &net_exit_list); |
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rcu_barrier(); |
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goto out; |
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} |
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static int __net_init net_defaults_init_net(struct net *net) |
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{ |
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net->core.sysctl_somaxconn = SOMAXCONN; |
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return 0; |
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} |
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static struct pernet_operations net_defaults_ops = { |
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.init = net_defaults_init_net, |
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}; |
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static __init int net_defaults_init(void) |
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{ |
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if (register_pernet_subsys(&net_defaults_ops)) |
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panic("Cannot initialize net default settings"); |
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|
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return 0; |
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} |
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core_initcall(net_defaults_init); |
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|
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#ifdef CONFIG_NET_NS |
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static struct ucounts *inc_net_namespaces(struct user_namespace *ns) |
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{ |
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return inc_ucount(ns, current_euid(), UCOUNT_NET_NAMESPACES); |
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} |
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static void dec_net_namespaces(struct ucounts *ucounts) |
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{ |
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dec_ucount(ucounts, UCOUNT_NET_NAMESPACES); |
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} |
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static struct kmem_cache *net_cachep __ro_after_init; |
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static struct workqueue_struct *netns_wq; |
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|
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static struct net *net_alloc(void) |
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{ |
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struct net *net = NULL; |
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struct net_generic *ng; |
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ng = net_alloc_generic(); |
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if (!ng) |
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goto out; |
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net = kmem_cache_zalloc(net_cachep, GFP_KERNEL); |
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if (!net) |
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goto out_free; |
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#ifdef CONFIG_KEYS |
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net->key_domain = kzalloc(sizeof(struct key_tag), GFP_KERNEL); |
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if (!net->key_domain) |
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goto out_free_2; |
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refcount_set(&net->key_domain->usage, 1); |
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#endif |
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rcu_assign_pointer(net->gen, ng); |
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out: |
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return net; |
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|
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#ifdef CONFIG_KEYS |
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out_free_2: |
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kmem_cache_free(net_cachep, net); |
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net = NULL; |
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#endif |
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out_free: |
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kfree(ng); |
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goto out; |
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} |
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static void net_free(struct net *net) |
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{ |
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kfree(rcu_access_pointer(net->gen)); |
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kmem_cache_free(net_cachep, net); |
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} |
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void net_drop_ns(void *p) |
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{ |
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struct net *ns = p; |
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if (ns && refcount_dec_and_test(&ns->passive)) |
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net_free(ns); |
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} |
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struct net *copy_net_ns(unsigned long flags, |
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struct user_namespace *user_ns, struct net *old_net) |
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{ |
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struct ucounts *ucounts; |
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struct net *net; |
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int rv; |
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|
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if (!(flags & CLONE_NEWNET)) |
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return get_net(old_net); |
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ucounts = inc_net_namespaces(user_ns); |
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if (!ucounts) |
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return ERR_PTR(-ENOSPC); |
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|
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net = net_alloc(); |
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if (!net) { |
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rv = -ENOMEM; |
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goto dec_ucounts; |
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} |
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refcount_set(&net->passive, 1); |
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net->ucounts = ucounts; |
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get_user_ns(user_ns); |
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|
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rv = down_read_killable(&pernet_ops_rwsem); |
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if (rv < 0) |
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goto put_userns; |
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|
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rv = setup_net(net, user_ns); |
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|
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up_read(&pernet_ops_rwsem); |
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|
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if (rv < 0) { |
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put_userns: |
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key_remove_domain(net->key_domain); |
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put_user_ns(user_ns); |
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net_drop_ns(net); |
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dec_ucounts: |
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dec_net_namespaces(ucounts); |
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return ERR_PTR(rv); |
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} |
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return net; |
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} |
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|
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/** |
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* net_ns_get_ownership - get sysfs ownership data for @net |
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* @net: network namespace in question (can be NULL) |
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* @uid: kernel user ID for sysfs objects |
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* @gid: kernel group ID for sysfs objects |
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* |
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* Returns the uid/gid pair of root in the user namespace associated with the |
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* given network namespace. |
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*/ |
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void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid) |
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{ |
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if (net) { |
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kuid_t ns_root_uid = make_kuid(net->user_ns, 0); |
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kgid_t ns_root_gid = make_kgid(net->user_ns, 0); |
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|
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if (uid_valid(ns_root_uid)) |
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*uid = ns_root_uid; |
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|
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if (gid_valid(ns_root_gid)) |
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*gid = ns_root_gid; |
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} else { |
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*uid = GLOBAL_ROOT_UID; |
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*gid = GLOBAL_ROOT_GID; |
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} |
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} |
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EXPORT_SYMBOL_GPL(net_ns_get_ownership); |
|
|
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static void unhash_nsid(struct net *net, struct net *last) |
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{ |
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struct net *tmp; |
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/* This function is only called from cleanup_net() work, |
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* and this work is the only process, that may delete |
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* a net from net_namespace_list. So, when the below |
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* is executing, the list may only grow. Thus, we do not |
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* use for_each_net_rcu() or net_rwsem. |
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*/ |
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for_each_net(tmp) { |
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int id; |
|
|
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spin_lock_bh(&tmp->nsid_lock); |
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id = __peernet2id(tmp, net); |
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if (id >= 0) |
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idr_remove(&tmp->netns_ids, id); |
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spin_unlock_bh(&tmp->nsid_lock); |
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if (id >= 0) |
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rtnl_net_notifyid(tmp, RTM_DELNSID, id, 0, NULL, |
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GFP_KERNEL); |
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if (tmp == last) |
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break; |
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} |
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spin_lock_bh(&net->nsid_lock); |
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idr_destroy(&net->netns_ids); |
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spin_unlock_bh(&net->nsid_lock); |
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} |
|
|
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static LLIST_HEAD(cleanup_list); |
|
|
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static void cleanup_net(struct work_struct *work) |
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{ |
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const struct pernet_operations *ops; |
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struct net *net, *tmp, *last; |
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struct llist_node *net_kill_list; |
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LIST_HEAD(net_exit_list); |
|
|
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/* Atomically snapshot the list of namespaces to cleanup */ |
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net_kill_list = llist_del_all(&cleanup_list); |
|
|
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down_read(&pernet_ops_rwsem); |
|
|
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/* Don't let anyone else find us. */ |
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down_write(&net_rwsem); |
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llist_for_each_entry(net, net_kill_list, cleanup_list) |
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list_del_rcu(&net->list); |
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/* Cache last net. After we unlock rtnl, no one new net |
|
* added to net_namespace_list can assign nsid pointer |
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* to a net from net_kill_list (see peernet2id_alloc()). |
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* So, we skip them in unhash_nsid(). |
|
* |
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* Note, that unhash_nsid() does not delete nsid links |
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* between net_kill_list's nets, as they've already |
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* deleted from net_namespace_list. But, this would be |
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* useless anyway, as netns_ids are destroyed there. |
|
*/ |
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last = list_last_entry(&net_namespace_list, struct net, list); |
|
up_write(&net_rwsem); |
|
|
|
llist_for_each_entry(net, net_kill_list, cleanup_list) { |
|
unhash_nsid(net, last); |
|
list_add_tail(&net->exit_list, &net_exit_list); |
|
} |
|
|
|
/* Run all of the network namespace pre_exit methods */ |
|
list_for_each_entry_reverse(ops, &pernet_list, list) |
|
ops_pre_exit_list(ops, &net_exit_list); |
|
|
|
/* |
|
* Another CPU might be rcu-iterating the list, wait for it. |
|
* This needs to be before calling the exit() notifiers, so |
|
* the rcu_barrier() below isn't sufficient alone. |
|
* Also the pre_exit() and exit() methods need this barrier. |
|
*/ |
|
synchronize_rcu(); |
|
|
|
/* Run all of the network namespace exit methods */ |
|
list_for_each_entry_reverse(ops, &pernet_list, list) |
|
ops_exit_list(ops, &net_exit_list); |
|
|
|
/* Free the net generic variables */ |
|
list_for_each_entry_reverse(ops, &pernet_list, list) |
|
ops_free_list(ops, &net_exit_list); |
|
|
|
up_read(&pernet_ops_rwsem); |
|
|
|
/* Ensure there are no outstanding rcu callbacks using this |
|
* network namespace. |
|
*/ |
|
rcu_barrier(); |
|
|
|
/* Finally it is safe to free my network namespace structure */ |
|
list_for_each_entry_safe(net, tmp, &net_exit_list, exit_list) { |
|
list_del_init(&net->exit_list); |
|
dec_net_namespaces(net->ucounts); |
|
key_remove_domain(net->key_domain); |
|
put_user_ns(net->user_ns); |
|
net_drop_ns(net); |
|
} |
|
} |
|
|
|
/** |
|
* net_ns_barrier - wait until concurrent net_cleanup_work is done |
|
* |
|
* cleanup_net runs from work queue and will first remove namespaces |
|
* from the global list, then run net exit functions. |
|
* |
|
* Call this in module exit path to make sure that all netns |
|
* ->exit ops have been invoked before the function is removed. |
|
*/ |
|
void net_ns_barrier(void) |
|
{ |
|
down_write(&pernet_ops_rwsem); |
|
up_write(&pernet_ops_rwsem); |
|
} |
|
EXPORT_SYMBOL(net_ns_barrier); |
|
|
|
static DECLARE_WORK(net_cleanup_work, cleanup_net); |
|
|
|
void __put_net(struct net *net) |
|
{ |
|
/* Cleanup the network namespace in process context */ |
|
if (llist_add(&net->cleanup_list, &cleanup_list)) |
|
queue_work(netns_wq, &net_cleanup_work); |
|
} |
|
EXPORT_SYMBOL_GPL(__put_net); |
|
|
|
/** |
|
* get_net_ns - increment the refcount of the network namespace |
|
* @ns: common namespace (net) |
|
* |
|
* Returns the net's common namespace. |
|
*/ |
|
struct ns_common *get_net_ns(struct ns_common *ns) |
|
{ |
|
return &get_net(container_of(ns, struct net, ns))->ns; |
|
} |
|
EXPORT_SYMBOL_GPL(get_net_ns); |
|
|
|
struct net *get_net_ns_by_fd(int fd) |
|
{ |
|
struct file *file; |
|
struct ns_common *ns; |
|
struct net *net; |
|
|
|
file = proc_ns_fget(fd); |
|
if (IS_ERR(file)) |
|
return ERR_CAST(file); |
|
|
|
ns = get_proc_ns(file_inode(file)); |
|
if (ns->ops == &netns_operations) |
|
net = get_net(container_of(ns, struct net, ns)); |
|
else |
|
net = ERR_PTR(-EINVAL); |
|
|
|
fput(file); |
|
return net; |
|
} |
|
EXPORT_SYMBOL_GPL(get_net_ns_by_fd); |
|
#endif |
|
|
|
struct net *get_net_ns_by_pid(pid_t pid) |
|
{ |
|
struct task_struct *tsk; |
|
struct net *net; |
|
|
|
/* Lookup the network namespace */ |
|
net = ERR_PTR(-ESRCH); |
|
rcu_read_lock(); |
|
tsk = find_task_by_vpid(pid); |
|
if (tsk) { |
|
struct nsproxy *nsproxy; |
|
task_lock(tsk); |
|
nsproxy = tsk->nsproxy; |
|
if (nsproxy) |
|
net = get_net(nsproxy->net_ns); |
|
task_unlock(tsk); |
|
} |
|
rcu_read_unlock(); |
|
return net; |
|
} |
|
EXPORT_SYMBOL_GPL(get_net_ns_by_pid); |
|
|
|
static __net_init int net_ns_net_init(struct net *net) |
|
{ |
|
#ifdef CONFIG_NET_NS |
|
net->ns.ops = &netns_operations; |
|
#endif |
|
return ns_alloc_inum(&net->ns); |
|
} |
|
|
|
static __net_exit void net_ns_net_exit(struct net *net) |
|
{ |
|
ns_free_inum(&net->ns); |
|
} |
|
|
|
static struct pernet_operations __net_initdata net_ns_ops = { |
|
.init = net_ns_net_init, |
|
.exit = net_ns_net_exit, |
|
}; |
|
|
|
static const struct nla_policy rtnl_net_policy[NETNSA_MAX + 1] = { |
|
[NETNSA_NONE] = { .type = NLA_UNSPEC }, |
|
[NETNSA_NSID] = { .type = NLA_S32 }, |
|
[NETNSA_PID] = { .type = NLA_U32 }, |
|
[NETNSA_FD] = { .type = NLA_U32 }, |
|
[NETNSA_TARGET_NSID] = { .type = NLA_S32 }, |
|
}; |
|
|
|
static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct net *net = sock_net(skb->sk); |
|
struct nlattr *tb[NETNSA_MAX + 1]; |
|
struct nlattr *nla; |
|
struct net *peer; |
|
int nsid, err; |
|
|
|
err = nlmsg_parse_deprecated(nlh, sizeof(struct rtgenmsg), tb, |
|
NETNSA_MAX, rtnl_net_policy, extack); |
|
if (err < 0) |
|
return err; |
|
if (!tb[NETNSA_NSID]) { |
|
NL_SET_ERR_MSG(extack, "nsid is missing"); |
|
return -EINVAL; |
|
} |
|
nsid = nla_get_s32(tb[NETNSA_NSID]); |
|
|
|
if (tb[NETNSA_PID]) { |
|
peer = get_net_ns_by_pid(nla_get_u32(tb[NETNSA_PID])); |
|
nla = tb[NETNSA_PID]; |
|
} else if (tb[NETNSA_FD]) { |
|
peer = get_net_ns_by_fd(nla_get_u32(tb[NETNSA_FD])); |
|
nla = tb[NETNSA_FD]; |
|
} else { |
|
NL_SET_ERR_MSG(extack, "Peer netns reference is missing"); |
|
return -EINVAL; |
|
} |
|
if (IS_ERR(peer)) { |
|
NL_SET_BAD_ATTR(extack, nla); |
|
NL_SET_ERR_MSG(extack, "Peer netns reference is invalid"); |
|
return PTR_ERR(peer); |
|
} |
|
|
|
spin_lock_bh(&net->nsid_lock); |
|
if (__peernet2id(net, peer) >= 0) { |
|
spin_unlock_bh(&net->nsid_lock); |
|
err = -EEXIST; |
|
NL_SET_BAD_ATTR(extack, nla); |
|
NL_SET_ERR_MSG(extack, |
|
"Peer netns already has a nsid assigned"); |
|
goto out; |
|
} |
|
|
|
err = alloc_netid(net, peer, nsid); |
|
spin_unlock_bh(&net->nsid_lock); |
|
if (err >= 0) { |
|
rtnl_net_notifyid(net, RTM_NEWNSID, err, NETLINK_CB(skb).portid, |
|
nlh, GFP_KERNEL); |
|
err = 0; |
|
} else if (err == -ENOSPC && nsid >= 0) { |
|
err = -EEXIST; |
|
NL_SET_BAD_ATTR(extack, tb[NETNSA_NSID]); |
|
NL_SET_ERR_MSG(extack, "The specified nsid is already used"); |
|
} |
|
out: |
|
put_net(peer); |
|
return err; |
|
} |
|
|
|
static int rtnl_net_get_size(void) |
|
{ |
|
return NLMSG_ALIGN(sizeof(struct rtgenmsg)) |
|
+ nla_total_size(sizeof(s32)) /* NETNSA_NSID */ |
|
+ nla_total_size(sizeof(s32)) /* NETNSA_CURRENT_NSID */ |
|
; |
|
} |
|
|
|
struct net_fill_args { |
|
u32 portid; |
|
u32 seq; |
|
int flags; |
|
int cmd; |
|
int nsid; |
|
bool add_ref; |
|
int ref_nsid; |
|
}; |
|
|
|
static int rtnl_net_fill(struct sk_buff *skb, struct net_fill_args *args) |
|
{ |
|
struct nlmsghdr *nlh; |
|
struct rtgenmsg *rth; |
|
|
|
nlh = nlmsg_put(skb, args->portid, args->seq, args->cmd, sizeof(*rth), |
|
args->flags); |
|
if (!nlh) |
|
return -EMSGSIZE; |
|
|
|
rth = nlmsg_data(nlh); |
|
rth->rtgen_family = AF_UNSPEC; |
|
|
|
if (nla_put_s32(skb, NETNSA_NSID, args->nsid)) |
|
goto nla_put_failure; |
|
|
|
if (args->add_ref && |
|
nla_put_s32(skb, NETNSA_CURRENT_NSID, args->ref_nsid)) |
|
goto nla_put_failure; |
|
|
|
nlmsg_end(skb, nlh); |
|
return 0; |
|
|
|
nla_put_failure: |
|
nlmsg_cancel(skb, nlh); |
|
return -EMSGSIZE; |
|
} |
|
|
|
static int rtnl_net_valid_getid_req(struct sk_buff *skb, |
|
const struct nlmsghdr *nlh, |
|
struct nlattr **tb, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
int i, err; |
|
|
|
if (!netlink_strict_get_check(skb)) |
|
return nlmsg_parse_deprecated(nlh, sizeof(struct rtgenmsg), |
|
tb, NETNSA_MAX, rtnl_net_policy, |
|
extack); |
|
|
|
err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct rtgenmsg), tb, |
|
NETNSA_MAX, rtnl_net_policy, |
|
extack); |
|
if (err) |
|
return err; |
|
|
|
for (i = 0; i <= NETNSA_MAX; i++) { |
|
if (!tb[i]) |
|
continue; |
|
|
|
switch (i) { |
|
case NETNSA_PID: |
|
case NETNSA_FD: |
|
case NETNSA_NSID: |
|
case NETNSA_TARGET_NSID: |
|
break; |
|
default: |
|
NL_SET_ERR_MSG(extack, "Unsupported attribute in peer netns getid request"); |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int rtnl_net_getid(struct sk_buff *skb, struct nlmsghdr *nlh, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct net *net = sock_net(skb->sk); |
|
struct nlattr *tb[NETNSA_MAX + 1]; |
|
struct net_fill_args fillargs = { |
|
.portid = NETLINK_CB(skb).portid, |
|
.seq = nlh->nlmsg_seq, |
|
.cmd = RTM_NEWNSID, |
|
}; |
|
struct net *peer, *target = net; |
|
struct nlattr *nla; |
|
struct sk_buff *msg; |
|
int err; |
|
|
|
err = rtnl_net_valid_getid_req(skb, nlh, tb, extack); |
|
if (err < 0) |
|
return err; |
|
if (tb[NETNSA_PID]) { |
|
peer = get_net_ns_by_pid(nla_get_u32(tb[NETNSA_PID])); |
|
nla = tb[NETNSA_PID]; |
|
} else if (tb[NETNSA_FD]) { |
|
peer = get_net_ns_by_fd(nla_get_u32(tb[NETNSA_FD])); |
|
nla = tb[NETNSA_FD]; |
|
} else if (tb[NETNSA_NSID]) { |
|
peer = get_net_ns_by_id(net, nla_get_s32(tb[NETNSA_NSID])); |
|
if (!peer) |
|
peer = ERR_PTR(-ENOENT); |
|
nla = tb[NETNSA_NSID]; |
|
} else { |
|
NL_SET_ERR_MSG(extack, "Peer netns reference is missing"); |
|
return -EINVAL; |
|
} |
|
|
|
if (IS_ERR(peer)) { |
|
NL_SET_BAD_ATTR(extack, nla); |
|
NL_SET_ERR_MSG(extack, "Peer netns reference is invalid"); |
|
return PTR_ERR(peer); |
|
} |
|
|
|
if (tb[NETNSA_TARGET_NSID]) { |
|
int id = nla_get_s32(tb[NETNSA_TARGET_NSID]); |
|
|
|
target = rtnl_get_net_ns_capable(NETLINK_CB(skb).sk, id); |
|
if (IS_ERR(target)) { |
|
NL_SET_BAD_ATTR(extack, tb[NETNSA_TARGET_NSID]); |
|
NL_SET_ERR_MSG(extack, |
|
"Target netns reference is invalid"); |
|
err = PTR_ERR(target); |
|
goto out; |
|
} |
|
fillargs.add_ref = true; |
|
fillargs.ref_nsid = peernet2id(net, peer); |
|
} |
|
|
|
msg = nlmsg_new(rtnl_net_get_size(), GFP_KERNEL); |
|
if (!msg) { |
|
err = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
fillargs.nsid = peernet2id(target, peer); |
|
err = rtnl_net_fill(msg, &fillargs); |
|
if (err < 0) |
|
goto err_out; |
|
|
|
err = rtnl_unicast(msg, net, NETLINK_CB(skb).portid); |
|
goto out; |
|
|
|
err_out: |
|
nlmsg_free(msg); |
|
out: |
|
if (fillargs.add_ref) |
|
put_net(target); |
|
put_net(peer); |
|
return err; |
|
} |
|
|
|
struct rtnl_net_dump_cb { |
|
struct net *tgt_net; |
|
struct net *ref_net; |
|
struct sk_buff *skb; |
|
struct net_fill_args fillargs; |
|
int idx; |
|
int s_idx; |
|
}; |
|
|
|
/* Runs in RCU-critical section. */ |
|
static int rtnl_net_dumpid_one(int id, void *peer, void *data) |
|
{ |
|
struct rtnl_net_dump_cb *net_cb = (struct rtnl_net_dump_cb *)data; |
|
int ret; |
|
|
|
if (net_cb->idx < net_cb->s_idx) |
|
goto cont; |
|
|
|
net_cb->fillargs.nsid = id; |
|
if (net_cb->fillargs.add_ref) |
|
net_cb->fillargs.ref_nsid = __peernet2id(net_cb->ref_net, peer); |
|
ret = rtnl_net_fill(net_cb->skb, &net_cb->fillargs); |
|
if (ret < 0) |
|
return ret; |
|
|
|
cont: |
|
net_cb->idx++; |
|
return 0; |
|
} |
|
|
|
static int rtnl_valid_dump_net_req(const struct nlmsghdr *nlh, struct sock *sk, |
|
struct rtnl_net_dump_cb *net_cb, |
|
struct netlink_callback *cb) |
|
{ |
|
struct netlink_ext_ack *extack = cb->extack; |
|
struct nlattr *tb[NETNSA_MAX + 1]; |
|
int err, i; |
|
|
|
err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct rtgenmsg), tb, |
|
NETNSA_MAX, rtnl_net_policy, |
|
extack); |
|
if (err < 0) |
|
return err; |
|
|
|
for (i = 0; i <= NETNSA_MAX; i++) { |
|
if (!tb[i]) |
|
continue; |
|
|
|
if (i == NETNSA_TARGET_NSID) { |
|
struct net *net; |
|
|
|
net = rtnl_get_net_ns_capable(sk, nla_get_s32(tb[i])); |
|
if (IS_ERR(net)) { |
|
NL_SET_BAD_ATTR(extack, tb[i]); |
|
NL_SET_ERR_MSG(extack, |
|
"Invalid target network namespace id"); |
|
return PTR_ERR(net); |
|
} |
|
net_cb->fillargs.add_ref = true; |
|
net_cb->ref_net = net_cb->tgt_net; |
|
net_cb->tgt_net = net; |
|
} else { |
|
NL_SET_BAD_ATTR(extack, tb[i]); |
|
NL_SET_ERR_MSG(extack, |
|
"Unsupported attribute in dump request"); |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int rtnl_net_dumpid(struct sk_buff *skb, struct netlink_callback *cb) |
|
{ |
|
struct rtnl_net_dump_cb net_cb = { |
|
.tgt_net = sock_net(skb->sk), |
|
.skb = skb, |
|
.fillargs = { |
|
.portid = NETLINK_CB(cb->skb).portid, |
|
.seq = cb->nlh->nlmsg_seq, |
|
.flags = NLM_F_MULTI, |
|
.cmd = RTM_NEWNSID, |
|
}, |
|
.idx = 0, |
|
.s_idx = cb->args[0], |
|
}; |
|
int err = 0; |
|
|
|
if (cb->strict_check) { |
|
err = rtnl_valid_dump_net_req(cb->nlh, skb->sk, &net_cb, cb); |
|
if (err < 0) |
|
goto end; |
|
} |
|
|
|
rcu_read_lock(); |
|
idr_for_each(&net_cb.tgt_net->netns_ids, rtnl_net_dumpid_one, &net_cb); |
|
rcu_read_unlock(); |
|
|
|
cb->args[0] = net_cb.idx; |
|
end: |
|
if (net_cb.fillargs.add_ref) |
|
put_net(net_cb.tgt_net); |
|
return err < 0 ? err : skb->len; |
|
} |
|
|
|
static void rtnl_net_notifyid(struct net *net, int cmd, int id, u32 portid, |
|
struct nlmsghdr *nlh, gfp_t gfp) |
|
{ |
|
struct net_fill_args fillargs = { |
|
.portid = portid, |
|
.seq = nlh ? nlh->nlmsg_seq : 0, |
|
.cmd = cmd, |
|
.nsid = id, |
|
}; |
|
struct sk_buff *msg; |
|
int err = -ENOMEM; |
|
|
|
msg = nlmsg_new(rtnl_net_get_size(), gfp); |
|
if (!msg) |
|
goto out; |
|
|
|
err = rtnl_net_fill(msg, &fillargs); |
|
if (err < 0) |
|
goto err_out; |
|
|
|
rtnl_notify(msg, net, portid, RTNLGRP_NSID, nlh, gfp); |
|
return; |
|
|
|
err_out: |
|
nlmsg_free(msg); |
|
out: |
|
rtnl_set_sk_err(net, RTNLGRP_NSID, err); |
|
} |
|
|
|
static int __init net_ns_init(void) |
|
{ |
|
struct net_generic *ng; |
|
|
|
#ifdef CONFIG_NET_NS |
|
net_cachep = kmem_cache_create("net_namespace", sizeof(struct net), |
|
SMP_CACHE_BYTES, |
|
SLAB_PANIC|SLAB_ACCOUNT, NULL); |
|
|
|
/* Create workqueue for cleanup */ |
|
netns_wq = create_singlethread_workqueue("netns"); |
|
if (!netns_wq) |
|
panic("Could not create netns workq"); |
|
#endif |
|
|
|
ng = net_alloc_generic(); |
|
if (!ng) |
|
panic("Could not allocate generic netns"); |
|
|
|
rcu_assign_pointer(init_net.gen, ng); |
|
|
|
down_write(&pernet_ops_rwsem); |
|
if (setup_net(&init_net, &init_user_ns)) |
|
panic("Could not setup the initial network namespace"); |
|
|
|
init_net_initialized = true; |
|
up_write(&pernet_ops_rwsem); |
|
|
|
if (register_pernet_subsys(&net_ns_ops)) |
|
panic("Could not register network namespace subsystems"); |
|
|
|
rtnl_register(PF_UNSPEC, RTM_NEWNSID, rtnl_net_newid, NULL, |
|
RTNL_FLAG_DOIT_UNLOCKED); |
|
rtnl_register(PF_UNSPEC, RTM_GETNSID, rtnl_net_getid, rtnl_net_dumpid, |
|
RTNL_FLAG_DOIT_UNLOCKED); |
|
|
|
return 0; |
|
} |
|
|
|
pure_initcall(net_ns_init); |
|
|
|
#ifdef CONFIG_NET_NS |
|
static int __register_pernet_operations(struct list_head *list, |
|
struct pernet_operations *ops) |
|
{ |
|
struct net *net; |
|
int error; |
|
LIST_HEAD(net_exit_list); |
|
|
|
list_add_tail(&ops->list, list); |
|
if (ops->init || (ops->id && ops->size)) { |
|
/* We held write locked pernet_ops_rwsem, and parallel |
|
* setup_net() and cleanup_net() are not possible. |
|
*/ |
|
for_each_net(net) { |
|
error = ops_init(ops, net); |
|
if (error) |
|
goto out_undo; |
|
list_add_tail(&net->exit_list, &net_exit_list); |
|
} |
|
} |
|
return 0; |
|
|
|
out_undo: |
|
/* If I have an error cleanup all namespaces I initialized */ |
|
list_del(&ops->list); |
|
ops_pre_exit_list(ops, &net_exit_list); |
|
synchronize_rcu(); |
|
ops_exit_list(ops, &net_exit_list); |
|
ops_free_list(ops, &net_exit_list); |
|
return error; |
|
} |
|
|
|
static void __unregister_pernet_operations(struct pernet_operations *ops) |
|
{ |
|
struct net *net; |
|
LIST_HEAD(net_exit_list); |
|
|
|
list_del(&ops->list); |
|
/* See comment in __register_pernet_operations() */ |
|
for_each_net(net) |
|
list_add_tail(&net->exit_list, &net_exit_list); |
|
ops_pre_exit_list(ops, &net_exit_list); |
|
synchronize_rcu(); |
|
ops_exit_list(ops, &net_exit_list); |
|
ops_free_list(ops, &net_exit_list); |
|
} |
|
|
|
#else |
|
|
|
static int __register_pernet_operations(struct list_head *list, |
|
struct pernet_operations *ops) |
|
{ |
|
if (!init_net_initialized) { |
|
list_add_tail(&ops->list, list); |
|
return 0; |
|
} |
|
|
|
return ops_init(ops, &init_net); |
|
} |
|
|
|
static void __unregister_pernet_operations(struct pernet_operations *ops) |
|
{ |
|
if (!init_net_initialized) { |
|
list_del(&ops->list); |
|
} else { |
|
LIST_HEAD(net_exit_list); |
|
list_add(&init_net.exit_list, &net_exit_list); |
|
ops_pre_exit_list(ops, &net_exit_list); |
|
synchronize_rcu(); |
|
ops_exit_list(ops, &net_exit_list); |
|
ops_free_list(ops, &net_exit_list); |
|
} |
|
} |
|
|
|
#endif /* CONFIG_NET_NS */ |
|
|
|
static DEFINE_IDA(net_generic_ids); |
|
|
|
static int register_pernet_operations(struct list_head *list, |
|
struct pernet_operations *ops) |
|
{ |
|
int error; |
|
|
|
if (ops->id) { |
|
error = ida_alloc_min(&net_generic_ids, MIN_PERNET_OPS_ID, |
|
GFP_KERNEL); |
|
if (error < 0) |
|
return error; |
|
*ops->id = error; |
|
max_gen_ptrs = max(max_gen_ptrs, *ops->id + 1); |
|
} |
|
error = __register_pernet_operations(list, ops); |
|
if (error) { |
|
rcu_barrier(); |
|
if (ops->id) |
|
ida_free(&net_generic_ids, *ops->id); |
|
} |
|
|
|
return error; |
|
} |
|
|
|
static void unregister_pernet_operations(struct pernet_operations *ops) |
|
{ |
|
__unregister_pernet_operations(ops); |
|
rcu_barrier(); |
|
if (ops->id) |
|
ida_free(&net_generic_ids, *ops->id); |
|
} |
|
|
|
/** |
|
* register_pernet_subsys - register a network namespace subsystem |
|
* @ops: pernet operations structure for the subsystem |
|
* |
|
* Register a subsystem which has init and exit functions |
|
* that are called when network namespaces are created and |
|
* destroyed respectively. |
|
* |
|
* When registered all network namespace init functions are |
|
* called for every existing network namespace. Allowing kernel |
|
* modules to have a race free view of the set of network namespaces. |
|
* |
|
* When a new network namespace is created all of the init |
|
* methods are called in the order in which they were registered. |
|
* |
|
* When a network namespace is destroyed all of the exit methods |
|
* are called in the reverse of the order with which they were |
|
* registered. |
|
*/ |
|
int register_pernet_subsys(struct pernet_operations *ops) |
|
{ |
|
int error; |
|
down_write(&pernet_ops_rwsem); |
|
error = register_pernet_operations(first_device, ops); |
|
up_write(&pernet_ops_rwsem); |
|
return error; |
|
} |
|
EXPORT_SYMBOL_GPL(register_pernet_subsys); |
|
|
|
/** |
|
* unregister_pernet_subsys - unregister a network namespace subsystem |
|
* @ops: pernet operations structure to manipulate |
|
* |
|
* Remove the pernet operations structure from the list to be |
|
* used when network namespaces are created or destroyed. In |
|
* addition run the exit method for all existing network |
|
* namespaces. |
|
*/ |
|
void unregister_pernet_subsys(struct pernet_operations *ops) |
|
{ |
|
down_write(&pernet_ops_rwsem); |
|
unregister_pernet_operations(ops); |
|
up_write(&pernet_ops_rwsem); |
|
} |
|
EXPORT_SYMBOL_GPL(unregister_pernet_subsys); |
|
|
|
/** |
|
* register_pernet_device - register a network namespace device |
|
* @ops: pernet operations structure for the subsystem |
|
* |
|
* Register a device which has init and exit functions |
|
* that are called when network namespaces are created and |
|
* destroyed respectively. |
|
* |
|
* When registered all network namespace init functions are |
|
* called for every existing network namespace. Allowing kernel |
|
* modules to have a race free view of the set of network namespaces. |
|
* |
|
* When a new network namespace is created all of the init |
|
* methods are called in the order in which they were registered. |
|
* |
|
* When a network namespace is destroyed all of the exit methods |
|
* are called in the reverse of the order with which they were |
|
* registered. |
|
*/ |
|
int register_pernet_device(struct pernet_operations *ops) |
|
{ |
|
int error; |
|
down_write(&pernet_ops_rwsem); |
|
error = register_pernet_operations(&pernet_list, ops); |
|
if (!error && (first_device == &pernet_list)) |
|
first_device = &ops->list; |
|
up_write(&pernet_ops_rwsem); |
|
return error; |
|
} |
|
EXPORT_SYMBOL_GPL(register_pernet_device); |
|
|
|
/** |
|
* unregister_pernet_device - unregister a network namespace netdevice |
|
* @ops: pernet operations structure to manipulate |
|
* |
|
* Remove the pernet operations structure from the list to be |
|
* used when network namespaces are created or destroyed. In |
|
* addition run the exit method for all existing network |
|
* namespaces. |
|
*/ |
|
void unregister_pernet_device(struct pernet_operations *ops) |
|
{ |
|
down_write(&pernet_ops_rwsem); |
|
if (&ops->list == first_device) |
|
first_device = first_device->next; |
|
unregister_pernet_operations(ops); |
|
up_write(&pernet_ops_rwsem); |
|
} |
|
EXPORT_SYMBOL_GPL(unregister_pernet_device); |
|
|
|
#ifdef CONFIG_NET_NS |
|
static struct ns_common *netns_get(struct task_struct *task) |
|
{ |
|
struct net *net = NULL; |
|
struct nsproxy *nsproxy; |
|
|
|
task_lock(task); |
|
nsproxy = task->nsproxy; |
|
if (nsproxy) |
|
net = get_net(nsproxy->net_ns); |
|
task_unlock(task); |
|
|
|
return net ? &net->ns : NULL; |
|
} |
|
|
|
static inline struct net *to_net_ns(struct ns_common *ns) |
|
{ |
|
return container_of(ns, struct net, ns); |
|
} |
|
|
|
static void netns_put(struct ns_common *ns) |
|
{ |
|
put_net(to_net_ns(ns)); |
|
} |
|
|
|
static int netns_install(struct nsset *nsset, struct ns_common *ns) |
|
{ |
|
struct nsproxy *nsproxy = nsset->nsproxy; |
|
struct net *net = to_net_ns(ns); |
|
|
|
if (!ns_capable(net->user_ns, CAP_SYS_ADMIN) || |
|
!ns_capable(nsset->cred->user_ns, CAP_SYS_ADMIN)) |
|
return -EPERM; |
|
|
|
put_net(nsproxy->net_ns); |
|
nsproxy->net_ns = get_net(net); |
|
return 0; |
|
} |
|
|
|
static struct user_namespace *netns_owner(struct ns_common *ns) |
|
{ |
|
return to_net_ns(ns)->user_ns; |
|
} |
|
|
|
const struct proc_ns_operations netns_operations = { |
|
.name = "net", |
|
.type = CLONE_NEWNET, |
|
.get = netns_get, |
|
.put = netns_put, |
|
.install = netns_install, |
|
.owner = netns_owner, |
|
}; |
|
#endif
|
|
|