include/net/net_namespace.h - SHIFTPHONES/kernel/shift/mainline - Gitiles

 /* 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 <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/ieee802154_6lowpan.h>
 #include <net/netns/sctp.h>
 #include <net/netns/dccp.h>
 #include <net/netns/netfilter.h>
 #include <net/netns/x_tables.h>
 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 #include <net/netns/conntrack.h>
 #endif
 #include <net/netns/nftables.h>
 #include <net/netns/xfrm.h>
 #include <net/netns/mpls.h>
 #include <net/netns/can.h>
 #include <linux/ns_common.h>
 #include <linux/idr.h>
 #include <linux/skbuff.h>

 struct user_namespace;
 struct proc_dir_entry;
 struct net_device;
 struct sock;
 struct ctl_table_header;
 struct net_generic;
 struct sock;
 struct netns_ipvs;


 #define NETDEV_HASHBITS    8
 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)

 struct net {
 	refcount_t		passive;	/* To decided when the network
 						 * namespace should be freed.
 						 */
 	refcount_t		count;		/* To decided when the network
 						 *  namespace should be shut down.
 						 */
 	spinlock_t		rules_mod_lock;

 	atomic64_t		cookie_gen;

 	struct list_head	list;		/* list of network namespaces */
 	struct list_head	cleanup_list;	/* namespaces on death row */
 	struct list_head	exit_list;	/* Use only net_mutex */

 	struct user_namespace   *user_ns;	/* Owning user namespace */
 	struct ucounts		*ucounts;
 	spinlock_t		nsid_lock;
 	struct idr		netns_ids;

 	struct ns_common	ns;

 	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 list_head 	dev_base_head;
 	struct hlist_head 	*dev_name_head;
 	struct hlist_head	*dev_index_head;
 	unsigned int		dev_base_seq;	/* protected by rtnl_mutex */
 	int			ifindex;
 	unsigned int		dev_unreg_count;

 	/* core fib_rules */
 	struct list_head	rules_ops;

 	struct list_head	fib_notifier_ops;  /* protected by net_mutex */

 	struct net_device       *loopback_dev;          /* The loopback */
 	struct netns_core	core;
 	struct netns_mib	mib;
 	struct netns_packet	packet;
 	struct netns_unix	unx;
 	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
 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
 	struct netns_dccp	dccp;
 #endif
 #ifdef CONFIG_NETFILTER
 	struct netns_nf		nf;
 	struct netns_xt		xt;
 #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_DEFRAG_IPV6)
 	struct netns_nf_frag	nf_frag;
 #endif
 	struct sock		*nfnl;
 	struct sock		*nfnl_stash;
 #if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT)
 	struct list_head        nfnl_acct_list;
 #endif
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
 	struct list_head	nfct_timeout_list;
 #endif
 #endif
 #ifdef CONFIG_WEXT_CORE
 	struct sk_buff_head	wext_nlevents;
 #endif
 	struct net_generic __rcu	*gen;

 	/* Note : following structs are cache line aligned */
 #ifdef CONFIG_XFRM
 	struct netns_xfrm	xfrm;
 #endif
 #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
 	struct sock		*diag_nlsk;
 	atomic_t		fnhe_genid;
 } __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_barrier(void);
 #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_barrier(void) {}
 #endif /* CONFIG_NET_NS */


 extern struct list_head net_namespace_list;

 struct net *get_net_ns_by_pid(pid_t pid);
 struct net *get_net_ns_by_fd(int fd);

 #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);

 static inline struct net *get_net(struct net *net)
 {
 	refcount_inc(&net->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->count))
 		net = NULL;
 	return net;
 }

 static inline void put_net(struct net *net)
 {
 	if (refcount_dec_and_test(&net->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->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


 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
 }

 #define for_each_net(VAR)				\
 	list_for_each_entry(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);
 int peernet2id(struct net *net, struct net *peer);
 bool peernet_has_id(struct net *net, struct net *peer);
 struct net *get_net_ns_by_id(struct net *net, int id);

 struct pernet_operations {
 	struct list_head list;
 	int (*init)(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;
 struct ctl_table_header;

 #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(struct net *net)
 {
 	return atomic_read(&net->ipv4.rt_genid);
 }

 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(struct net *net)
 {
 	return atomic_read(&net->fnhe_genid);
 }

 static inline void fnhe_genid_bump(struct net *net)
 {
 	atomic_inc(&net->fnhe_genid);
 }

 #endif /* __NET_NET_NAMESPACE_H */
	/* 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 <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/ieee802154_6lowpan.h>
	#include <net/netns/sctp.h>
	#include <net/netns/dccp.h>
	#include <net/netns/netfilter.h>
	#include <net/netns/x_tables.h>
	#if defined(CONFIG_NF_CONNTRACK) \|\| defined(CONFIG_NF_CONNTRACK_MODULE)
	#include <net/netns/conntrack.h>
	#endif
	#include <net/netns/nftables.h>
	#include <net/netns/xfrm.h>
	#include <net/netns/mpls.h>
	#include <net/netns/can.h>
	#include <linux/ns_common.h>
	#include <linux/idr.h>
	#include <linux/skbuff.h>

	struct user_namespace;
	struct proc_dir_entry;
	struct net_device;
	struct sock;
	struct ctl_table_header;
	struct net_generic;
	struct sock;
	struct netns_ipvs;


	#define NETDEV_HASHBITS 8
	#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)

	struct net {
	refcount_t passive; /* To decided when the network
	* namespace should be freed.
	*/
	refcount_t count; /* To decided when the network
	* namespace should be shut down.
	*/
	spinlock_t rules_mod_lock;

	atomic64_t cookie_gen;

	struct list_head list; /* list of network namespaces */
	struct list_head cleanup_list; /* namespaces on death row */
	struct list_head exit_list; /* Use only net_mutex */

	struct user_namespace user_ns; / Owning user namespace */
	struct ucounts *ucounts;
	spinlock_t nsid_lock;
	struct idr netns_ids;

	struct ns_common ns;

	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 list_head dev_base_head;
	struct hlist_head *dev_name_head;
	struct hlist_head *dev_index_head;
	unsigned int dev_base_seq; /* protected by rtnl_mutex */
	int ifindex;
	unsigned int dev_unreg_count;

	/* core fib_rules */
	struct list_head rules_ops;

	struct list_head fib_notifier_ops; /* protected by net_mutex */

	struct net_device loopback_dev; / The loopback */
	struct netns_core core;
	struct netns_mib mib;
	struct netns_packet packet;
	struct netns_unix unx;
	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
	#if defined(CONFIG_IP_DCCP) \|\| defined(CONFIG_IP_DCCP_MODULE)
	struct netns_dccp dccp;
	#endif
	#ifdef CONFIG_NETFILTER
	struct netns_nf nf;
	struct netns_xt xt;
	#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_DEFRAG_IPV6)
	struct netns_nf_frag nf_frag;
	#endif
	struct sock *nfnl;
	struct sock *nfnl_stash;
	#if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT)
	struct list_head nfnl_acct_list;
	#endif
	#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
	struct list_head nfct_timeout_list;
	#endif
	#endif
	#ifdef CONFIG_WEXT_CORE
	struct sk_buff_head wext_nlevents;
	#endif
	struct net_generic __rcu *gen;

	/* Note : following structs are cache line aligned */
	#ifdef CONFIG_XFRM
	struct netns_xfrm xfrm;
	#endif
	#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
	struct sock *diag_nlsk;
	atomic_t fnhe_genid;
	} __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_barrier(void);
	#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_barrier(void) {}
	#endif /* CONFIG_NET_NS */


	extern struct list_head net_namespace_list;

	struct net *get_net_ns_by_pid(pid_t pid);
	struct net *get_net_ns_by_fd(int fd);

	#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);

	static inline struct net get_net(struct net net)
	{
	refcount_inc(&net->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->count))
	net = NULL;
	return net;
	}

	static inline void put_net(struct net *net)
	{
	if (refcount_dec_and_test(&net->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->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


	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
	}

	#define for_each_net(VAR) \
	list_for_each_entry(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);
	int peernet2id(struct net net, struct net peer);
	bool peernet_has_id(struct net net, struct net peer);
	struct net get_net_ns_by_id(struct net net, int id);

	struct pernet_operations {
	struct list_head list;
	int (init)(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;
	struct ctl_table_header;

	#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(struct net *net)
	{
	return atomic_read(&net->ipv4.rt_genid);
	}

	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(struct net *net)
	{
	return atomic_read(&net->fnhe_genid);
	}

	static inline void fnhe_genid_bump(struct net *net)
	{
	atomic_inc(&net->fnhe_genid);
	}

	#endif /* __NET_NET_NAMESPACE_H */