264 lines
6.2 KiB
C
264 lines
6.2 KiB
C
/*
|
|
* Operations on the network namespace
|
|
*/
|
|
#ifndef __NET_NET_NAMESPACE_H
|
|
#define __NET_NET_NAMESPACE_H
|
|
|
|
#include <asm/atomic.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/list.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/dccp.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 proc_dir_entry;
|
|
struct net_device;
|
|
struct sock;
|
|
struct ctl_table_header;
|
|
struct net_generic;
|
|
|
|
struct net {
|
|
atomic_t count; /* To decided when the network
|
|
* namespace should be freed.
|
|
*/
|
|
#ifdef NETNS_REFCNT_DEBUG
|
|
atomic_t use_count; /* To track references we
|
|
* destroy on demand
|
|
*/
|
|
#endif
|
|
struct list_head list; /* list of network namespaces */
|
|
struct work_struct work; /* work struct for freeing */
|
|
|
|
struct proc_dir_entry *proc_net;
|
|
struct proc_dir_entry *proc_net_stat;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
struct ctl_table_set sysctls;
|
|
#endif
|
|
|
|
struct net_device *loopback_dev; /* The loopback */
|
|
|
|
struct list_head dev_base_head;
|
|
struct hlist_head *dev_name_head;
|
|
struct hlist_head *dev_index_head;
|
|
|
|
/* core fib_rules */
|
|
struct list_head rules_ops;
|
|
spinlock_t rules_mod_lock;
|
|
|
|
struct sock *rtnl; /* rtnetlink socket */
|
|
|
|
struct netns_core core;
|
|
struct netns_mib mib;
|
|
struct netns_packet packet;
|
|
struct netns_unix unx;
|
|
struct netns_ipv4 ipv4;
|
|
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
|
|
struct netns_ipv6 ipv6;
|
|
#endif
|
|
#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
|
|
struct netns_dccp dccp;
|
|
#endif
|
|
#ifdef CONFIG_NETFILTER
|
|
struct netns_xt xt;
|
|
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
|
|
struct netns_ct ct;
|
|
#endif
|
|
#endif
|
|
#ifdef CONFIG_XFRM
|
|
struct netns_xfrm xfrm;
|
|
#endif
|
|
struct net_generic *gen;
|
|
};
|
|
|
|
|
|
#include <linux/seq_file_net.h>
|
|
|
|
/* Init's network namespace */
|
|
extern struct net init_net;
|
|
|
|
#ifdef CONFIG_NET
|
|
#define INIT_NET_NS(net_ns) .net_ns = &init_net,
|
|
|
|
extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
|
|
|
|
#else /* CONFIG_NET */
|
|
|
|
#define INIT_NET_NS(net_ns)
|
|
|
|
static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
|
|
{
|
|
/* There is nothing to copy so this is a noop */
|
|
return net_ns;
|
|
}
|
|
#endif /* CONFIG_NET */
|
|
|
|
|
|
extern struct list_head net_namespace_list;
|
|
|
|
#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;
|
|
}
|
|
#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;
|
|
}
|
|
#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)
|
|
|
|
#ifdef CONFIG_NET_NS
|
|
#define __net_init
|
|
#define __net_exit
|
|
#define __net_initdata
|
|
#else
|
|
#define __net_init __init
|
|
#define __net_exit __exit_refok
|
|
#define __net_initdata __initdata
|
|
#endif
|
|
|
|
struct pernet_operations {
|
|
struct list_head list;
|
|
int (*init)(struct net *net);
|
|
void (*exit)(struct net *net);
|
|
};
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* This is critically important. Most of the network code cleanup
|
|
* 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_gen_subsys(int *id, struct pernet_operations *);
|
|
extern void unregister_pernet_gen_subsys(int id, struct pernet_operations *);
|
|
extern int register_pernet_device(struct pernet_operations *);
|
|
extern void unregister_pernet_device(struct pernet_operations *);
|
|
extern int register_pernet_gen_device(int *id, struct pernet_operations *);
|
|
extern void unregister_pernet_gen_device(int id, struct pernet_operations *);
|
|
|
|
struct ctl_path;
|
|
struct ctl_table;
|
|
struct ctl_table_header;
|
|
|
|
extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
|
|
const struct ctl_path *path, struct ctl_table *table);
|
|
extern struct ctl_table_header *register_net_sysctl_rotable(
|
|
const struct ctl_path *path, struct ctl_table *table);
|
|
extern void unregister_net_sysctl_table(struct ctl_table_header *header);
|
|
|
|
#endif /* __NET_NET_NAMESPACE_H */
|