8d87005207
In fact all we want is per-netns set of rules, however doing that will unnecessary complicate routines such as ipt_hook()/ipt_do_table, so make full xt_table array per-netns. Every user stubbed with init_net for a while. Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
178 lines
3.9 KiB
C
178 lines
3.9 KiB
C
/*
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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 <asm/atomic.h>
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#include <linux/workqueue.h>
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#include <linux/list.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/x_tables.h>
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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 {
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atomic_t count; /* To decided when the network
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* namespace should be freed.
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*/
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atomic_t use_count; /* To track references we
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* destroy on demand
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*/
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struct list_head list; /* list of network namespaces */
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struct work_struct work; /* work struct for freeing */
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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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struct proc_dir_entry *proc_net_root;
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struct list_head sysctl_table_headers;
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struct net_device *loopback_dev; /* The loopback */
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struct list_head dev_base_head;
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struct hlist_head *dev_name_head;
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struct hlist_head *dev_index_head;
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/* core fib_rules */
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struct list_head rules_ops;
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spinlock_t rules_mod_lock;
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struct sock *rtnl; /* rtnetlink socket */
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/* core sysctls */
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struct ctl_table_header *sysctl_core_hdr;
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int sysctl_somaxconn;
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struct netns_packet packet;
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struct netns_unix unx;
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struct netns_ipv4 ipv4;
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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struct netns_ipv6 ipv6;
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#endif
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#ifdef CONFIG_NETFILTER
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struct netns_xt xt;
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#endif
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};
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#ifdef CONFIG_NET
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/* Init's network namespace */
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extern struct net init_net;
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#define INIT_NET_NS(net_ns) .net_ns = &init_net,
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#else
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#define INIT_NET_NS(net_ns)
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#endif
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extern struct list_head net_namespace_list;
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#ifdef CONFIG_NET
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extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
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#else
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static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
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{
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/* There is nothing to copy so this is a noop */
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return net_ns;
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}
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#endif
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#ifdef CONFIG_NET_NS
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extern 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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atomic_inc(&net->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 (!atomic_inc_not_zero(&net->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 (atomic_dec_and_test(&net->count))
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__put_net(net);
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}
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static inline struct net *hold_net(struct net *net)
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{
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atomic_inc(&net->use_count);
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return net;
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}
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static inline void release_net(struct net *net)
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{
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atomic_dec(&net->use_count);
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}
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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 *hold_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 release_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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#endif
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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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#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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#else
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#define __net_init __init
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#define __net_exit __exit_refok
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#define __net_initdata __initdata
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#endif
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struct pernet_operations {
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struct list_head list;
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int (*init)(struct net *net);
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void (*exit)(struct net *net);
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};
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extern int register_pernet_subsys(struct pernet_operations *);
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extern void unregister_pernet_subsys(struct pernet_operations *);
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extern int register_pernet_device(struct pernet_operations *);
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extern void unregister_pernet_device(struct pernet_operations *);
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struct ctl_path;
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struct ctl_table;
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struct ctl_table_header;
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extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
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const struct ctl_path *path, struct ctl_table *table);
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extern void unregister_net_sysctl_table(struct ctl_table_header *header);
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#endif /* __NET_NET_NAMESPACE_H */
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