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32 results

net_namespace.h

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  • net_namespace.h 11.17 KiB
    /* 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/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 <net/netns/xdp.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 uevent_sock;
    struct netns_ipvs;
    struct bpf_prog;
    
    
    #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	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 */
    
    	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 uevent_sock	*uevent_sock;		/* uevent socket */
    
    	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;  /* Populated by
    						    * register_pernet_subsys()
    						    */
    	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;
    	struct ctl_table_header *nf_frag_frags_hdr;
    #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;
    
    	struct bpf_prog __rcu	*flow_dissector_prog;
    
    	/* 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
    #ifdef CONFIG_XDP_SOCKETS
    	struct netns_xdp	xdp;
    #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_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid);
    
    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_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) {}
    #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
    }
    
    /* Protected by net_rwsem */
    #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;
    	/*
    	 * 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.
    	 */
    	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 */