include/net/net_namespace.h - kernel/msm-4.19 - Gitiles

 /*
  * Operations on the network namespace
  */
 #ifndef __NET_NET_NAMESPACE_H
 #define __NET_NET_NAMESPACE_H

 #include <linux/atomic.h>
 #include <linux/workqueue.h>
 #include <linux/list.h>
 #include <linux/sysctl.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/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/xfrm.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 {
 	atomic_t		passive;	/* To decided when the network
 						 * namespace should be freed.
 						 */
 	atomic_t		count;		/* To decided when the network
 						 *  namespace should be shut down.
 						 */
 #ifdef NETNS_REFCNT_DEBUG
 	atomic_t		use_count;	/* To track references we
 						 * destroy on demand
 						 */
 #endif
 	spinlock_t		rules_mod_lock;

 	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 */

 	unsigned int		proc_inum;

 	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;

 	/* core fib_rules */
 	struct list_head	rules_ops;


 	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 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 IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
 	struct netns_nf_frag	nf_frag;
 #endif
 	struct sock		*nfnl;
 	struct sock		*nfnl_stash;
 #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
 	struct netns_ipvs	*ipvs;
 	struct sock		*diag_nlsk;
 	atomic_t		rt_genid;
 };

 /*
  * ifindex generation is per-net namespace, and loopback is
  * always the 1st device in ns (see net_dev_init), thus any
  * loopback device should get ifindex 1
  */

 #define LOOPBACK_IFINDEX	1

 #include <linux/seq_file_net.h>

 /* Init's network namespace */
 extern struct net init_net;

 #ifdef CONFIG_NET_NS
 extern struct net *copy_net_ns(unsigned long flags,
 	struct user_namespace *user_ns, struct net *old_net);

 #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;
 }
 #endif /* CONFIG_NET_NS */


 extern struct list_head net_namespace_list;

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

 #ifdef CONFIG_NET_NS
 extern void __put_net(struct net *net);

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

 static inline void put_net(struct net *net)
 {
 	if (atomic_dec_and_test(&net->count))
 		__put_net(net);
 }

 static inline
 int net_eq(const struct net *net1, const struct net *net2)
 {
 	return net1 == net2;
 }

 extern 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;
 }

 #define net_drop_ns NULL
 #endif


 #ifdef NETNS_REFCNT_DEBUG
 static inline struct net *hold_net(struct net *net)
 {
 	if (net)
 		atomic_inc(&net->use_count);
 	return net;
 }

 static inline void release_net(struct net *net)
 {
 	if (net)
 		atomic_dec(&net->use_count);
 }
 #else
 static inline struct net *hold_net(struct net *net)
 {
 	return net;
 }

 static inline void release_net(struct net *net)
 {
 }
 #endif

 #ifdef CONFIG_NET_NS

 static inline void write_pnet(struct net **pnet, struct net *net)
 {
 	*pnet = net;
 }

 static inline struct net *read_pnet(struct net * const *pnet)
 {
 	return *pnet;
 }

 #else

 #define write_pnet(pnet, net)	do { (void)(net);} while (0)
 #define read_pnet(pnet)		(&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	__exit_refok
 #define __net_initdata	__initdata
 #define __net_initconst	__initconst
 #endif

 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);
 	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.
  */
 extern int register_pernet_subsys(struct pernet_operations *);
 extern void unregister_pernet_subsys(struct pernet_operations *);
 extern int register_pernet_device(struct pernet_operations *);
 extern void unregister_pernet_device(struct pernet_operations *);

 struct ctl_table;
 struct ctl_table_header;

 #ifdef CONFIG_SYSCTL
 extern int net_sysctl_init(void);
 extern struct ctl_table_header *register_net_sysctl(struct net *net,
 	const char *path, struct ctl_table *table);
 extern 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(struct net *net)
 {
 	return atomic_read(&net->rt_genid);
 }

 static inline void rt_genid_bump(struct net *net)
 {
 	atomic_inc(&net->rt_genid);
 }

 #endif /* __NET_NET_NAMESPACE_H */
	/*
	* Operations on the network namespace
	*/
	#ifndef __NET_NET_NAMESPACE_H
	#define __NET_NET_NAMESPACE_H

	#include <linux/atomic.h>
	#include <linux/workqueue.h>
	#include <linux/list.h>
	#include <linux/sysctl.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/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/xfrm.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 {
	atomic_t passive; /* To decided when the network
	* namespace should be freed.
	*/
	atomic_t count; /* To decided when the network
	* namespace should be shut down.
	*/
	#ifdef NETNS_REFCNT_DEBUG
	atomic_t use_count; /* To track references we
	* destroy on demand
	*/
	#endif
	spinlock_t rules_mod_lock;

	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 */

	unsigned int proc_inum;

	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;

	/* core fib_rules */
	struct list_head rules_ops;


	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 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 IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
	struct netns_nf_frag nf_frag;
	#endif
	struct sock *nfnl;
	struct sock *nfnl_stash;
	#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
	struct netns_ipvs *ipvs;
	struct sock *diag_nlsk;
	atomic_t rt_genid;
	};

	/*
	* ifindex generation is per-net namespace, and loopback is
	* always the 1st device in ns (see net_dev_init), thus any
	* loopback device should get ifindex 1
	*/

	#define LOOPBACK_IFINDEX 1

	#include <linux/seq_file_net.h>

	/* Init's network namespace */
	extern struct net init_net;

	#ifdef CONFIG_NET_NS
	extern struct net *copy_net_ns(unsigned long flags,
	struct user_namespace user_ns, struct net old_net);

	#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;
	}
	#endif /* CONFIG_NET_NS */


	extern struct list_head net_namespace_list;

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

	#ifdef CONFIG_NET_NS
	extern void __put_net(struct net *net);

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

	static inline void put_net(struct net *net)
	{
	if (atomic_dec_and_test(&net->count))
	__put_net(net);
	}

	static inline
	int net_eq(const struct net net1, const struct net net2)
	{
	return net1 == net2;
	}

	extern 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;
	}

	#define net_drop_ns NULL
	#endif


	#ifdef NETNS_REFCNT_DEBUG
	static inline struct net hold_net(struct net net)
	{
	if (net)
	atomic_inc(&net->use_count);
	return net;
	}

	static inline void release_net(struct net *net)
	{
	if (net)
	atomic_dec(&net->use_count);
	}
	#else
	static inline struct net hold_net(struct net net)
	{
	return net;
	}

	static inline void release_net(struct net *net)
	{
	}
	#endif

	#ifdef CONFIG_NET_NS

	static inline void write_pnet(struct net *pnet, struct net net)
	{
	*pnet = net;
	}

	static inline struct net read_pnet(struct net const *pnet)
	{
	return *pnet;
	}

	#else

	#define write_pnet(pnet, net) do { (void)(net);} while (0)
	#define read_pnet(pnet) (&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 __exit_refok
	#define __net_initdata __initdata
	#define __net_initconst __initconst
	#endif

	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);
	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.
	*/
	extern int register_pernet_subsys(struct pernet_operations *);
	extern void unregister_pernet_subsys(struct pernet_operations *);
	extern int register_pernet_device(struct pernet_operations *);
	extern void unregister_pernet_device(struct pernet_operations *);

	struct ctl_table;
	struct ctl_table_header;

	#ifdef CONFIG_SYSCTL
	extern int net_sysctl_init(void);
	extern struct ctl_table_header register_net_sysctl(struct net net,
	const char path, struct ctl_table table);
	extern 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(struct net *net)
	{
	return atomic_read(&net->rt_genid);
	}

	static inline void rt_genid_bump(struct net *net)
	{
	atomic_inc(&net->rt_genid);
	}

	#endif /* __NET_NET_NAMESPACE_H */