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478 lines
12 KiB
478 lines
12 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Operations on the network namespace |
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*/ |
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#ifndef __NET_NET_NAMESPACE_H |
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#define __NET_NET_NAMESPACE_H |
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#include <linux/atomic.h> |
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#include <linux/refcount.h> |
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#include <linux/workqueue.h> |
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#include <linux/list.h> |
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#include <linux/sysctl.h> |
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#include <linux/uidgid.h> |
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#include <net/flow.h> |
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#include <net/netns/core.h> |
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#include <net/netns/mib.h> |
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#include <net/netns/unix.h> |
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#include <net/netns/packet.h> |
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#include <net/netns/ipv4.h> |
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#include <net/netns/ipv6.h> |
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#include <net/netns/nexthop.h> |
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#include <net/netns/ieee802154_6lowpan.h> |
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#include <net/netns/sctp.h> |
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#include <net/netns/dccp.h> |
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#include <net/netns/netfilter.h> |
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#include <net/netns/x_tables.h> |
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#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
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#include <net/netns/conntrack.h> |
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#endif |
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#include <net/netns/nftables.h> |
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#include <net/netns/xfrm.h> |
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#include <net/netns/mpls.h> |
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#include <net/netns/can.h> |
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#include <net/netns/xdp.h> |
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#include <net/netns/bpf.h> |
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#include <linux/ns_common.h> |
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#include <linux/idr.h> |
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#include <linux/skbuff.h> |
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#include <linux/notifier.h> |
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struct user_namespace; |
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struct proc_dir_entry; |
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struct net_device; |
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struct sock; |
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struct ctl_table_header; |
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struct net_generic; |
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struct uevent_sock; |
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struct netns_ipvs; |
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struct bpf_prog; |
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#define NETDEV_HASHBITS 8 |
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#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) |
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struct net { |
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/* First cache line can be often dirtied. |
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* Do not place here read-mostly fields. |
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*/ |
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refcount_t passive; /* To decide when the network |
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* namespace should be freed. |
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*/ |
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spinlock_t rules_mod_lock; |
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unsigned int dev_unreg_count; |
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unsigned int dev_base_seq; /* protected by rtnl_mutex */ |
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int ifindex; |
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spinlock_t nsid_lock; |
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atomic_t fnhe_genid; |
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struct list_head list; /* list of network namespaces */ |
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struct list_head exit_list; /* To linked to call pernet exit |
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* methods on dead net ( |
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* pernet_ops_rwsem read locked), |
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* or to unregister pernet ops |
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* (pernet_ops_rwsem write locked). |
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*/ |
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struct llist_node cleanup_list; /* namespaces on death row */ |
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#ifdef CONFIG_KEYS |
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struct key_tag *key_domain; /* Key domain of operation tag */ |
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#endif |
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struct user_namespace *user_ns; /* Owning user namespace */ |
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struct ucounts *ucounts; |
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struct idr netns_ids; |
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struct ns_common ns; |
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struct list_head dev_base_head; |
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struct proc_dir_entry *proc_net; |
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struct proc_dir_entry *proc_net_stat; |
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#ifdef CONFIG_SYSCTL |
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struct ctl_table_set sysctls; |
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#endif |
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struct sock *rtnl; /* rtnetlink socket */ |
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struct sock *genl_sock; |
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struct uevent_sock *uevent_sock; /* uevent socket */ |
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struct hlist_head *dev_name_head; |
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struct hlist_head *dev_index_head; |
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struct raw_notifier_head netdev_chain; |
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/* Note that @hash_mix can be read millions times per second, |
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* it is critical that it is on a read_mostly cache line. |
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*/ |
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u32 hash_mix; |
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struct net_device *loopback_dev; /* The loopback */ |
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/* core fib_rules */ |
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struct list_head rules_ops; |
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struct netns_core core; |
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struct netns_mib mib; |
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struct netns_packet packet; |
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struct netns_unix unx; |
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struct netns_nexthop nexthop; |
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struct netns_ipv4 ipv4; |
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#if IS_ENABLED(CONFIG_IPV6) |
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struct netns_ipv6 ipv6; |
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#endif |
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#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) |
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struct netns_ieee802154_lowpan ieee802154_lowpan; |
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#endif |
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#if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) |
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struct netns_sctp sctp; |
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#endif |
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#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) |
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struct netns_dccp dccp; |
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#endif |
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#ifdef CONFIG_NETFILTER |
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struct netns_nf nf; |
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struct netns_xt xt; |
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#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
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struct netns_ct ct; |
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#endif |
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#if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE) |
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struct netns_nftables nft; |
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#endif |
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#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |
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struct netns_nf_frag nf_frag; |
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struct ctl_table_header *nf_frag_frags_hdr; |
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#endif |
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struct sock *nfnl; |
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struct sock *nfnl_stash; |
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#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
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struct list_head nfct_timeout_list; |
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#endif |
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#endif |
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#ifdef CONFIG_WEXT_CORE |
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struct sk_buff_head wext_nlevents; |
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#endif |
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struct net_generic __rcu *gen; |
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/* Used to store attached BPF programs */ |
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struct netns_bpf bpf; |
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/* Note : following structs are cache line aligned */ |
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#ifdef CONFIG_XFRM |
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struct netns_xfrm xfrm; |
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#endif |
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u64 net_cookie; /* written once */ |
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#if IS_ENABLED(CONFIG_IP_VS) |
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struct netns_ipvs *ipvs; |
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#endif |
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#if IS_ENABLED(CONFIG_MPLS) |
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struct netns_mpls mpls; |
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#endif |
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#if IS_ENABLED(CONFIG_CAN) |
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struct netns_can can; |
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#endif |
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#ifdef CONFIG_XDP_SOCKETS |
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struct netns_xdp xdp; |
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#endif |
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#if IS_ENABLED(CONFIG_CRYPTO_USER) |
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struct sock *crypto_nlsk; |
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#endif |
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struct sock *diag_nlsk; |
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} __randomize_layout; |
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#include <linux/seq_file_net.h> |
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/* Init's network namespace */ |
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extern struct net init_net; |
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#ifdef CONFIG_NET_NS |
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struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, |
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struct net *old_net); |
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void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid); |
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void net_ns_barrier(void); |
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#else /* CONFIG_NET_NS */ |
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#include <linux/sched.h> |
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#include <linux/nsproxy.h> |
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static inline 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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if (flags & CLONE_NEWNET) |
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return ERR_PTR(-EINVAL); |
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return old_net; |
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} |
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static inline void net_ns_get_ownership(const struct net *net, |
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kuid_t *uid, kgid_t *gid) |
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{ |
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*uid = GLOBAL_ROOT_UID; |
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*gid = GLOBAL_ROOT_GID; |
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} |
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static inline void net_ns_barrier(void) {} |
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#endif /* CONFIG_NET_NS */ |
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extern struct list_head net_namespace_list; |
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struct net *get_net_ns_by_pid(pid_t pid); |
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struct net *get_net_ns_by_fd(int fd); |
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#ifdef CONFIG_SYSCTL |
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void ipx_register_sysctl(void); |
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void ipx_unregister_sysctl(void); |
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#else |
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#define ipx_register_sysctl() |
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#define ipx_unregister_sysctl() |
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#endif |
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#ifdef CONFIG_NET_NS |
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void __put_net(struct net *net); |
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static inline struct net *get_net(struct net *net) |
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{ |
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refcount_inc(&net->ns.count); |
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return net; |
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} |
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static inline struct net *maybe_get_net(struct net *net) |
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{ |
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/* Used when we know struct net exists but we |
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* aren't guaranteed a previous reference count |
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* exists. If the reference count is zero this |
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* function fails and returns NULL. |
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*/ |
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if (!refcount_inc_not_zero(&net->ns.count)) |
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net = NULL; |
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return net; |
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} |
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static inline void put_net(struct net *net) |
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{ |
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if (refcount_dec_and_test(&net->ns.count)) |
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__put_net(net); |
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} |
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static inline |
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int net_eq(const struct net *net1, const struct net *net2) |
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{ |
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return net1 == net2; |
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} |
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static inline int check_net(const struct net *net) |
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{ |
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return refcount_read(&net->ns.count) != 0; |
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} |
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void net_drop_ns(void *); |
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#else |
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static inline struct net *get_net(struct net *net) |
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{ |
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return net; |
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} |
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static inline void put_net(struct net *net) |
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{ |
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} |
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static inline struct net *maybe_get_net(struct net *net) |
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{ |
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return net; |
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} |
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static inline |
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int net_eq(const struct net *net1, const struct net *net2) |
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{ |
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return 1; |
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} |
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static inline int check_net(const struct net *net) |
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{ |
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return 1; |
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} |
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#define net_drop_ns NULL |
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#endif |
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typedef struct { |
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#ifdef CONFIG_NET_NS |
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struct net *net; |
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#endif |
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} possible_net_t; |
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static inline void write_pnet(possible_net_t *pnet, struct net *net) |
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{ |
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#ifdef CONFIG_NET_NS |
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pnet->net = net; |
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#endif |
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} |
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static inline struct net *read_pnet(const possible_net_t *pnet) |
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{ |
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#ifdef CONFIG_NET_NS |
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return pnet->net; |
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#else |
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return &init_net; |
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#endif |
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} |
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/* Protected by net_rwsem */ |
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#define for_each_net(VAR) \ |
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list_for_each_entry(VAR, &net_namespace_list, list) |
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#define for_each_net_continue_reverse(VAR) \ |
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list_for_each_entry_continue_reverse(VAR, &net_namespace_list, list) |
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#define for_each_net_rcu(VAR) \ |
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list_for_each_entry_rcu(VAR, &net_namespace_list, list) |
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#ifdef CONFIG_NET_NS |
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#define __net_init |
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#define __net_exit |
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#define __net_initdata |
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#define __net_initconst |
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#else |
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#define __net_init __init |
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#define __net_exit __ref |
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#define __net_initdata __initdata |
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#define __net_initconst __initconst |
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#endif |
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int peernet2id_alloc(struct net *net, struct net *peer, gfp_t gfp); |
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int peernet2id(const struct net *net, struct net *peer); |
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bool peernet_has_id(const struct net *net, struct net *peer); |
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struct net *get_net_ns_by_id(const struct net *net, int id); |
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struct pernet_operations { |
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struct list_head list; |
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/* |
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* Below methods are called without any exclusive locks. |
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* More than one net may be constructed and destructed |
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* in parallel on several cpus. Every pernet_operations |
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* have to keep in mind all other pernet_operations and |
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* to introduce a locking, if they share common resources. |
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* |
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* The only time they are called with exclusive lock is |
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* from register_pernet_subsys(), unregister_pernet_subsys() |
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* register_pernet_device() and unregister_pernet_device(). |
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* |
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* Exit methods using blocking RCU primitives, such as |
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* synchronize_rcu(), should be implemented via exit_batch. |
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* Then, destruction of a group of net requires single |
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* synchronize_rcu() related to these pernet_operations, |
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* instead of separate synchronize_rcu() for every net. |
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* Please, avoid synchronize_rcu() at all, where it's possible. |
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* |
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* Note that a combination of pre_exit() and exit() can |
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* be used, since a synchronize_rcu() is guaranteed between |
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* the calls. |
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*/ |
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int (*init)(struct net *net); |
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void (*pre_exit)(struct net *net); |
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void (*exit)(struct net *net); |
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void (*exit_batch)(struct list_head *net_exit_list); |
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unsigned int *id; |
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size_t size; |
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}; |
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/* |
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* Use these carefully. If you implement a network device and it |
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* needs per network namespace operations use device pernet operations, |
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* otherwise use pernet subsys operations. |
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* |
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* Network interfaces need to be removed from a dying netns _before_ |
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* subsys notifiers can be called, as most of the network code cleanup |
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* (which is done from subsys notifiers) runs with the assumption that |
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* dev_remove_pack has been called so no new packets will arrive during |
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* and after the cleanup functions have been called. dev_remove_pack |
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* is not per namespace so instead the guarantee of no more packets |
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* arriving in a network namespace is provided by ensuring that all |
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* network devices and all sockets have left the network namespace |
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* before the cleanup methods are called. |
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* |
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* For the longest time the ipv4 icmp code was registered as a pernet |
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* device which caused kernel oops, and panics during network |
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* namespace cleanup. So please don't get this wrong. |
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*/ |
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int register_pernet_subsys(struct pernet_operations *); |
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void unregister_pernet_subsys(struct pernet_operations *); |
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int register_pernet_device(struct pernet_operations *); |
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void unregister_pernet_device(struct pernet_operations *); |
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struct ctl_table; |
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struct ctl_table_header; |
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#ifdef CONFIG_SYSCTL |
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int net_sysctl_init(void); |
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struct ctl_table_header *register_net_sysctl(struct net *net, const char *path, |
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struct ctl_table *table); |
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void unregister_net_sysctl_table(struct ctl_table_header *header); |
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#else |
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static inline int net_sysctl_init(void) { return 0; } |
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static inline struct ctl_table_header *register_net_sysctl(struct net *net, |
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const char *path, struct ctl_table *table) |
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{ |
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return NULL; |
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} |
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static inline void unregister_net_sysctl_table(struct ctl_table_header *header) |
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{ |
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} |
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#endif |
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static inline int rt_genid_ipv4(const struct net *net) |
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{ |
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return atomic_read(&net->ipv4.rt_genid); |
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} |
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#if IS_ENABLED(CONFIG_IPV6) |
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static inline int rt_genid_ipv6(const struct net *net) |
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{ |
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return atomic_read(&net->ipv6.fib6_sernum); |
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} |
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#endif |
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static inline void rt_genid_bump_ipv4(struct net *net) |
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{ |
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atomic_inc(&net->ipv4.rt_genid); |
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} |
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extern void (*__fib6_flush_trees)(struct net *net); |
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static inline void rt_genid_bump_ipv6(struct net *net) |
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{ |
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if (__fib6_flush_trees) |
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__fib6_flush_trees(net); |
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} |
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#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) |
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static inline struct netns_ieee802154_lowpan * |
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net_ieee802154_lowpan(struct net *net) |
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{ |
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return &net->ieee802154_lowpan; |
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} |
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#endif |
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/* For callers who don't really care about whether it's IPv4 or IPv6 */ |
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static inline void rt_genid_bump_all(struct net *net) |
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{ |
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rt_genid_bump_ipv4(net); |
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rt_genid_bump_ipv6(net); |
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} |
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static inline int fnhe_genid(const struct net *net) |
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{ |
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return atomic_read(&net->fnhe_genid); |
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} |
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static inline void fnhe_genid_bump(struct net *net) |
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{ |
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atomic_inc(&net->fnhe_genid); |
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} |
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#endif /* __NET_NET_NAMESPACE_H */
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