545 lines
13 KiB
C
545 lines
13 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Operations on the network namespace
|
|
*/
|
|
#ifndef __NET_NET_NAMESPACE_H
|
|
#define __NET_NET_NAMESPACE_H
|
|
|
|
#include <linux/atomic.h>
|
|
#include <linux/refcount.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/list.h>
|
|
#include <linux/sysctl.h>
|
|
#include <linux/uidgid.h>
|
|
|
|
#include <net/flow.h>
|
|
#include <net/netns/core.h>
|
|
#include <net/netns/mib.h>
|
|
#include <net/netns/unix.h>
|
|
#include <net/netns/packet.h>
|
|
#include <net/netns/ipv4.h>
|
|
#include <net/netns/ipv6.h>
|
|
#include <net/netns/nexthop.h>
|
|
#include <net/netns/ieee802154_6lowpan.h>
|
|
#include <net/netns/sctp.h>
|
|
#include <net/netns/netfilter.h>
|
|
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
|
|
#include <net/netns/conntrack.h>
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
|
|
#include <net/netns/flow_table.h>
|
|
#endif
|
|
#include <net/netns/nftables.h>
|
|
#include <net/netns/xfrm.h>
|
|
#include <net/netns/mpls.h>
|
|
#include <net/netns/can.h>
|
|
#include <net/netns/xdp.h>
|
|
#include <net/netns/smc.h>
|
|
#include <net/netns/bpf.h>
|
|
#include <net/netns/mctp.h>
|
|
#include <net/net_trackers.h>
|
|
#include <linux/ns_common.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/notifier.h>
|
|
|
|
struct user_namespace;
|
|
struct proc_dir_entry;
|
|
struct net_device;
|
|
struct sock;
|
|
struct ctl_table_header;
|
|
struct net_generic;
|
|
struct uevent_sock;
|
|
struct netns_ipvs;
|
|
struct bpf_prog;
|
|
|
|
|
|
#define NETDEV_HASHBITS 8
|
|
#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
|
|
|
|
struct net {
|
|
/* First cache line can be often dirtied.
|
|
* Do not place here read-mostly fields.
|
|
*/
|
|
refcount_t passive; /* To decide when the network
|
|
* namespace should be freed.
|
|
*/
|
|
spinlock_t rules_mod_lock;
|
|
|
|
atomic_t dev_unreg_count;
|
|
|
|
unsigned int dev_base_seq; /* protected by rtnl_mutex */
|
|
int ifindex;
|
|
|
|
spinlock_t nsid_lock;
|
|
atomic_t fnhe_genid;
|
|
|
|
struct list_head list; /* list of network namespaces */
|
|
struct list_head exit_list; /* To linked to call pernet exit
|
|
* methods on dead net (
|
|
* pernet_ops_rwsem read locked),
|
|
* or to unregister pernet ops
|
|
* (pernet_ops_rwsem write locked).
|
|
*/
|
|
struct llist_node cleanup_list; /* namespaces on death row */
|
|
|
|
#ifdef CONFIG_KEYS
|
|
struct key_tag *key_domain; /* Key domain of operation tag */
|
|
#endif
|
|
struct user_namespace *user_ns; /* Owning user namespace */
|
|
struct ucounts *ucounts;
|
|
struct idr netns_ids;
|
|
|
|
struct ns_common ns;
|
|
struct ref_tracker_dir refcnt_tracker;
|
|
struct ref_tracker_dir notrefcnt_tracker; /* tracker for objects not
|
|
* refcounted against netns
|
|
*/
|
|
struct list_head dev_base_head;
|
|
struct proc_dir_entry *proc_net;
|
|
struct proc_dir_entry *proc_net_stat;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
struct ctl_table_set sysctls;
|
|
#endif
|
|
|
|
struct sock *rtnl; /* rtnetlink socket */
|
|
struct sock *genl_sock;
|
|
|
|
struct uevent_sock *uevent_sock; /* uevent socket */
|
|
|
|
struct hlist_head *dev_name_head;
|
|
struct hlist_head *dev_index_head;
|
|
struct raw_notifier_head netdev_chain;
|
|
|
|
/* Note that @hash_mix can be read millions times per second,
|
|
* it is critical that it is on a read_mostly cache line.
|
|
*/
|
|
u32 hash_mix;
|
|
|
|
struct net_device *loopback_dev; /* The loopback */
|
|
|
|
/* core fib_rules */
|
|
struct list_head rules_ops;
|
|
|
|
struct netns_core core;
|
|
struct netns_mib mib;
|
|
struct netns_packet packet;
|
|
#if IS_ENABLED(CONFIG_UNIX)
|
|
struct netns_unix unx;
|
|
#endif
|
|
struct netns_nexthop nexthop;
|
|
struct netns_ipv4 ipv4;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
struct netns_ipv6 ipv6;
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
|
|
struct netns_ieee802154_lowpan ieee802154_lowpan;
|
|
#endif
|
|
#if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
|
|
struct netns_sctp sctp;
|
|
#endif
|
|
#ifdef CONFIG_NETFILTER
|
|
struct netns_nf nf;
|
|
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
|
|
struct netns_ct ct;
|
|
#endif
|
|
#if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
|
|
struct netns_nftables nft;
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
|
|
struct netns_ft ft;
|
|
#endif
|
|
#endif
|
|
#ifdef CONFIG_WEXT_CORE
|
|
struct sk_buff_head wext_nlevents;
|
|
#endif
|
|
struct net_generic __rcu *gen;
|
|
|
|
/* Used to store attached BPF programs */
|
|
struct netns_bpf bpf;
|
|
|
|
/* Note : following structs are cache line aligned */
|
|
#ifdef CONFIG_XFRM
|
|
struct netns_xfrm xfrm;
|
|
#endif
|
|
|
|
u64 net_cookie; /* written once */
|
|
|
|
#if IS_ENABLED(CONFIG_IP_VS)
|
|
struct netns_ipvs *ipvs;
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_MPLS)
|
|
struct netns_mpls mpls;
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_CAN)
|
|
struct netns_can can;
|
|
#endif
|
|
#ifdef CONFIG_XDP_SOCKETS
|
|
struct netns_xdp xdp;
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_MCTP)
|
|
struct netns_mctp mctp;
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_CRYPTO_USER)
|
|
struct sock *crypto_nlsk;
|
|
#endif
|
|
struct sock *diag_nlsk;
|
|
#if IS_ENABLED(CONFIG_SMC)
|
|
struct netns_smc smc;
|
|
#endif
|
|
} __randomize_layout;
|
|
|
|
#include <linux/seq_file_net.h>
|
|
|
|
/* Init's network namespace */
|
|
extern struct net init_net;
|
|
|
|
#ifdef CONFIG_NET_NS
|
|
struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
|
|
struct net *old_net);
|
|
|
|
void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid);
|
|
|
|
void net_ns_barrier(void);
|
|
|
|
struct ns_common *get_net_ns(struct ns_common *ns);
|
|
struct net *get_net_ns_by_fd(int fd);
|
|
#else /* CONFIG_NET_NS */
|
|
#include <linux/sched.h>
|
|
#include <linux/nsproxy.h>
|
|
static inline struct net *copy_net_ns(unsigned long flags,
|
|
struct user_namespace *user_ns, struct net *old_net)
|
|
{
|
|
if (flags & CLONE_NEWNET)
|
|
return ERR_PTR(-EINVAL);
|
|
return old_net;
|
|
}
|
|
|
|
static inline void net_ns_get_ownership(const struct net *net,
|
|
kuid_t *uid, kgid_t *gid)
|
|
{
|
|
*uid = GLOBAL_ROOT_UID;
|
|
*gid = GLOBAL_ROOT_GID;
|
|
}
|
|
|
|
static inline void net_ns_barrier(void) {}
|
|
|
|
static inline struct ns_common *get_net_ns(struct ns_common *ns)
|
|
{
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static inline struct net *get_net_ns_by_fd(int fd)
|
|
{
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
#endif /* CONFIG_NET_NS */
|
|
|
|
|
|
extern struct list_head net_namespace_list;
|
|
|
|
struct net *get_net_ns_by_pid(pid_t pid);
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
void ipx_register_sysctl(void);
|
|
void ipx_unregister_sysctl(void);
|
|
#else
|
|
#define ipx_register_sysctl()
|
|
#define ipx_unregister_sysctl()
|
|
#endif
|
|
|
|
#ifdef CONFIG_NET_NS
|
|
void __put_net(struct net *net);
|
|
|
|
/* Try using get_net_track() instead */
|
|
static inline struct net *get_net(struct net *net)
|
|
{
|
|
refcount_inc(&net->ns.count);
|
|
return net;
|
|
}
|
|
|
|
static inline struct net *maybe_get_net(struct net *net)
|
|
{
|
|
/* Used when we know struct net exists but we
|
|
* aren't guaranteed a previous reference count
|
|
* exists. If the reference count is zero this
|
|
* function fails and returns NULL.
|
|
*/
|
|
if (!refcount_inc_not_zero(&net->ns.count))
|
|
net = NULL;
|
|
return net;
|
|
}
|
|
|
|
/* Try using put_net_track() instead */
|
|
static inline void put_net(struct net *net)
|
|
{
|
|
if (refcount_dec_and_test(&net->ns.count))
|
|
__put_net(net);
|
|
}
|
|
|
|
static inline
|
|
int net_eq(const struct net *net1, const struct net *net2)
|
|
{
|
|
return net1 == net2;
|
|
}
|
|
|
|
static inline int check_net(const struct net *net)
|
|
{
|
|
return refcount_read(&net->ns.count) != 0;
|
|
}
|
|
|
|
void net_drop_ns(void *);
|
|
|
|
#else
|
|
|
|
static inline struct net *get_net(struct net *net)
|
|
{
|
|
return net;
|
|
}
|
|
|
|
static inline void put_net(struct net *net)
|
|
{
|
|
}
|
|
|
|
static inline struct net *maybe_get_net(struct net *net)
|
|
{
|
|
return net;
|
|
}
|
|
|
|
static inline
|
|
int net_eq(const struct net *net1, const struct net *net2)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static inline int check_net(const struct net *net)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
#define net_drop_ns NULL
|
|
#endif
|
|
|
|
|
|
static inline void __netns_tracker_alloc(struct net *net,
|
|
netns_tracker *tracker,
|
|
bool refcounted,
|
|
gfp_t gfp)
|
|
{
|
|
#ifdef CONFIG_NET_NS_REFCNT_TRACKER
|
|
ref_tracker_alloc(refcounted ? &net->refcnt_tracker :
|
|
&net->notrefcnt_tracker,
|
|
tracker, gfp);
|
|
#endif
|
|
}
|
|
|
|
static inline void netns_tracker_alloc(struct net *net, netns_tracker *tracker,
|
|
gfp_t gfp)
|
|
{
|
|
__netns_tracker_alloc(net, tracker, true, gfp);
|
|
}
|
|
|
|
static inline void __netns_tracker_free(struct net *net,
|
|
netns_tracker *tracker,
|
|
bool refcounted)
|
|
{
|
|
#ifdef CONFIG_NET_NS_REFCNT_TRACKER
|
|
ref_tracker_free(refcounted ? &net->refcnt_tracker :
|
|
&net->notrefcnt_tracker, tracker);
|
|
#endif
|
|
}
|
|
|
|
static inline struct net *get_net_track(struct net *net,
|
|
netns_tracker *tracker, gfp_t gfp)
|
|
{
|
|
get_net(net);
|
|
netns_tracker_alloc(net, tracker, gfp);
|
|
return net;
|
|
}
|
|
|
|
static inline void put_net_track(struct net *net, netns_tracker *tracker)
|
|
{
|
|
__netns_tracker_free(net, tracker, true);
|
|
put_net(net);
|
|
}
|
|
|
|
typedef struct {
|
|
#ifdef CONFIG_NET_NS
|
|
struct net *net;
|
|
#endif
|
|
} possible_net_t;
|
|
|
|
static inline void write_pnet(possible_net_t *pnet, struct net *net)
|
|
{
|
|
#ifdef CONFIG_NET_NS
|
|
pnet->net = net;
|
|
#endif
|
|
}
|
|
|
|
static inline struct net *read_pnet(const possible_net_t *pnet)
|
|
{
|
|
#ifdef CONFIG_NET_NS
|
|
return pnet->net;
|
|
#else
|
|
return &init_net;
|
|
#endif
|
|
}
|
|
|
|
/* Protected by net_rwsem */
|
|
#define for_each_net(VAR) \
|
|
list_for_each_entry(VAR, &net_namespace_list, list)
|
|
#define for_each_net_continue_reverse(VAR) \
|
|
list_for_each_entry_continue_reverse(VAR, &net_namespace_list, list)
|
|
#define for_each_net_rcu(VAR) \
|
|
list_for_each_entry_rcu(VAR, &net_namespace_list, list)
|
|
|
|
#ifdef CONFIG_NET_NS
|
|
#define __net_init
|
|
#define __net_exit
|
|
#define __net_initdata
|
|
#define __net_initconst
|
|
#else
|
|
#define __net_init __init
|
|
#define __net_exit __ref
|
|
#define __net_initdata __initdata
|
|
#define __net_initconst __initconst
|
|
#endif
|
|
|
|
int peernet2id_alloc(struct net *net, struct net *peer, gfp_t gfp);
|
|
int peernet2id(const struct net *net, struct net *peer);
|
|
bool peernet_has_id(const struct net *net, struct net *peer);
|
|
struct net *get_net_ns_by_id(const struct net *net, int id);
|
|
|
|
struct pernet_operations {
|
|
struct list_head list;
|
|
/*
|
|
* Below methods are called without any exclusive locks.
|
|
* More than one net may be constructed and destructed
|
|
* in parallel on several cpus. Every pernet_operations
|
|
* have to keep in mind all other pernet_operations and
|
|
* to introduce a locking, if they share common resources.
|
|
*
|
|
* The only time they are called with exclusive lock is
|
|
* from register_pernet_subsys(), unregister_pernet_subsys()
|
|
* register_pernet_device() and unregister_pernet_device().
|
|
*
|
|
* Exit methods using blocking RCU primitives, such as
|
|
* synchronize_rcu(), should be implemented via exit_batch.
|
|
* Then, destruction of a group of net requires single
|
|
* synchronize_rcu() related to these pernet_operations,
|
|
* instead of separate synchronize_rcu() for every net.
|
|
* Please, avoid synchronize_rcu() at all, where it's possible.
|
|
*
|
|
* Note that a combination of pre_exit() and exit() can
|
|
* be used, since a synchronize_rcu() is guaranteed between
|
|
* the calls.
|
|
*/
|
|
int (*init)(struct net *net);
|
|
void (*pre_exit)(struct net *net);
|
|
void (*exit)(struct net *net);
|
|
void (*exit_batch)(struct list_head *net_exit_list);
|
|
unsigned int *id;
|
|
size_t size;
|
|
};
|
|
|
|
/*
|
|
* Use these carefully. If you implement a network device and it
|
|
* needs per network namespace operations use device pernet operations,
|
|
* otherwise use pernet subsys operations.
|
|
*
|
|
* Network interfaces need to be removed from a dying netns _before_
|
|
* subsys notifiers can be called, as most of the network code cleanup
|
|
* (which is done from subsys notifiers) runs with the assumption that
|
|
* dev_remove_pack has been called so no new packets will arrive during
|
|
* and after the cleanup functions have been called. dev_remove_pack
|
|
* is not per namespace so instead the guarantee of no more packets
|
|
* arriving in a network namespace is provided by ensuring that all
|
|
* network devices and all sockets have left the network namespace
|
|
* before the cleanup methods are called.
|
|
*
|
|
* For the longest time the ipv4 icmp code was registered as a pernet
|
|
* device which caused kernel oops, and panics during network
|
|
* namespace cleanup. So please don't get this wrong.
|
|
*/
|
|
int register_pernet_subsys(struct pernet_operations *);
|
|
void unregister_pernet_subsys(struct pernet_operations *);
|
|
int register_pernet_device(struct pernet_operations *);
|
|
void unregister_pernet_device(struct pernet_operations *);
|
|
|
|
struct ctl_table;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
int net_sysctl_init(void);
|
|
struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
|
|
struct ctl_table *table);
|
|
void unregister_net_sysctl_table(struct ctl_table_header *header);
|
|
#else
|
|
static inline int net_sysctl_init(void) { return 0; }
|
|
static inline struct ctl_table_header *register_net_sysctl(struct net *net,
|
|
const char *path, struct ctl_table *table)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static inline int rt_genid_ipv4(const struct net *net)
|
|
{
|
|
return atomic_read(&net->ipv4.rt_genid);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static inline int rt_genid_ipv6(const struct net *net)
|
|
{
|
|
return atomic_read(&net->ipv6.fib6_sernum);
|
|
}
|
|
#endif
|
|
|
|
static inline void rt_genid_bump_ipv4(struct net *net)
|
|
{
|
|
atomic_inc(&net->ipv4.rt_genid);
|
|
}
|
|
|
|
extern void (*__fib6_flush_trees)(struct net *net);
|
|
static inline void rt_genid_bump_ipv6(struct net *net)
|
|
{
|
|
if (__fib6_flush_trees)
|
|
__fib6_flush_trees(net);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
|
|
static inline struct netns_ieee802154_lowpan *
|
|
net_ieee802154_lowpan(struct net *net)
|
|
{
|
|
return &net->ieee802154_lowpan;
|
|
}
|
|
#endif
|
|
|
|
/* For callers who don't really care about whether it's IPv4 or IPv6 */
|
|
static inline void rt_genid_bump_all(struct net *net)
|
|
{
|
|
rt_genid_bump_ipv4(net);
|
|
rt_genid_bump_ipv6(net);
|
|
}
|
|
|
|
static inline int fnhe_genid(const struct net *net)
|
|
{
|
|
return atomic_read(&net->fnhe_genid);
|
|
}
|
|
|
|
static inline void fnhe_genid_bump(struct net *net)
|
|
{
|
|
atomic_inc(&net->fnhe_genid);
|
|
}
|
|
|
|
#ifdef CONFIG_NET
|
|
void net_ns_init(void);
|
|
#else
|
|
static inline void net_ns_init(void) {}
|
|
#endif
|
|
|
|
#endif /* __NET_NET_NAMESPACE_H */
|