2007-09-12 09:50:50 +00:00
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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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2011-07-26 23:09:06 +00:00
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#include <linux/atomic.h>
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2007-09-12 09:50:50 +00:00
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#include <linux/workqueue.h>
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#include <linux/list.h>
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2011-05-26 20:40:37 +00:00
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#include <linux/sysctl.h>
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2007-09-12 09:50:50 +00:00
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2008-04-01 02:41:14 +00:00
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#include <net/netns/core.h>
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2008-07-18 11:01:24 +00:00
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#include <net/netns/mib.h>
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2007-12-11 12:19:17 +00:00
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#include <net/netns/unix.h>
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2007-12-11 12:19:54 +00:00
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#include <net/netns/packet.h>
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2007-12-16 21:29:36 +00:00
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#include <net/netns/ipv4.h>
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2008-01-10 10:49:06 +00:00
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#include <net/netns/ipv6.h>
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2012-08-06 08:42:04 +00:00
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#include <net/netns/sctp.h>
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2008-04-14 05:28:42 +00:00
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#include <net/netns/dccp.h>
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2008-01-31 12:02:13 +00:00
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#include <net/netns/x_tables.h>
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2008-10-08 09:35:02 +00:00
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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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2008-11-26 01:14:31 +00:00
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#include <net/netns/xfrm.h>
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2007-12-11 12:19:17 +00:00
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2007-09-12 10:01:34 +00:00
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struct proc_dir_entry;
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2007-09-27 05:10:56 +00:00
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struct net_device;
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2007-11-20 06:26:51 +00:00
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struct sock;
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2007-12-01 12:51:01 +00:00
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struct ctl_table_header;
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2008-04-15 07:36:08 +00:00
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struct net_generic;
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2009-07-10 09:51:34 +00:00
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struct sock;
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2011-03-04 10:18:07 +00:00
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struct netns_ipvs;
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2007-12-01 12:51:01 +00:00
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2009-10-24 13:13:17 +00:00
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#define NETDEV_HASHBITS 8
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#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
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2007-09-12 09:50:50 +00:00
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struct net {
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2011-06-09 01:13:01 +00:00
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atomic_t passive; /* To decided when the network
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* namespace should be freed.
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*/
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2007-09-12 09:50:50 +00:00
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atomic_t count; /* To decided when the network
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2011-06-09 01:13:01 +00:00
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* namespace should be shut down.
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2007-09-12 09:50:50 +00:00
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*/
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2008-04-16 08:58:04 +00:00
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#ifdef NETNS_REFCNT_DEBUG
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2007-09-12 09:50:50 +00:00
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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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2008-04-16 08:58:04 +00:00
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#endif
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2010-10-14 05:56:18 +00:00
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spinlock_t rules_mod_lock;
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2007-09-12 09:50:50 +00:00
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struct list_head list; /* list of network namespaces */
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2009-11-29 22:25:27 +00:00
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struct list_head cleanup_list; /* namespaces on death row */
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2009-12-03 02:29:03 +00:00
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struct list_head exit_list; /* Use only net_mutex */
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2007-09-12 10:01:34 +00:00
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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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2007-09-17 18:56:21 +00:00
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2008-07-15 01:22:20 +00:00
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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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2007-11-30 12:55:42 +00:00
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2010-10-14 05:56:18 +00:00
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struct sock *rtnl; /* rtnetlink socket */
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struct sock *genl_sock;
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2007-09-27 05:10:56 +00:00
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2007-09-17 18:56:21 +00:00
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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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2011-06-21 03:11:20 +00:00
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unsigned int dev_base_seq; /* protected by rtnl_mutex */
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2012-08-08 21:53:19 +00:00
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int ifindex;
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2007-11-20 06:26:51 +00:00
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2008-01-10 11:20:28 +00:00
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/* core fib_rules */
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struct list_head rules_ops;
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2007-11-20 06:28:35 +00:00
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2010-10-14 05:56:18 +00:00
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struct net_device *loopback_dev; /* The loopback */
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2008-04-01 02:41:14 +00:00
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struct netns_core core;
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2008-07-18 11:01:24 +00:00
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struct netns_mib mib;
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2007-12-11 12:19:54 +00:00
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struct netns_packet packet;
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2007-12-11 12:19:17 +00:00
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struct netns_unix unx;
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2007-12-16 21:29:36 +00:00
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struct netns_ipv4 ipv4;
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2011-12-10 09:48:31 +00:00
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#if IS_ENABLED(CONFIG_IPV6)
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2008-01-10 10:49:06 +00:00
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struct netns_ipv6 ipv6;
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#endif
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2012-08-06 08:42:04 +00:00
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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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2008-04-14 05:28:42 +00:00
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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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2008-01-31 12:02:13 +00:00
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#ifdef CONFIG_NETFILTER
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struct netns_xt xt;
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2008-10-08 09:35:02 +00:00
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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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2012-09-18 16:50:08 +00:00
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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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2008-10-08 09:35:02 +00:00
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#endif
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2010-01-13 15:02:14 +00:00
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struct sock *nfnl;
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struct sock *nfnl_stash;
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2008-11-26 01:14:31 +00:00
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#endif
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2009-09-29 21:27:28 +00:00
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#ifdef CONFIG_WEXT_CORE
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2009-06-24 01:34:48 +00:00
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struct sk_buff_head wext_nlevents;
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2008-01-31 12:02:13 +00:00
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#endif
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2010-10-25 03:20:11 +00:00
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struct net_generic __rcu *gen;
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2010-10-14 05:56:18 +00:00
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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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2011-01-03 13:44:42 +00:00
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struct netns_ipvs *ipvs;
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2012-07-16 04:28:49 +00:00
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struct sock *diag_nlsk;
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2012-09-10 22:09:44 +00:00
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atomic_t rt_genid;
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2007-09-12 09:50:50 +00:00
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};
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2012-08-08 21:53:36 +00:00
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/*
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* ifindex generation is per-net namespace, and loopback is
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* always the 1st device in ns (see net_dev_init), thus any
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* loopback device should get ifindex 1
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*/
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#define LOOPBACK_IFINDEX 1
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2008-04-02 07:09:29 +00:00
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2008-04-02 07:10:28 +00:00
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#include <linux/seq_file_net.h>
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2007-09-13 07:16:29 +00:00
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/* Init's network namespace */
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2007-09-12 09:50:50 +00:00
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extern struct net init_net;
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2008-04-03 20:04:33 +00:00
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2012-06-14 09:16:42 +00:00
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#ifdef CONFIG_NET_NS
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2007-09-27 05:04:26 +00:00
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extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
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2008-04-02 07:09:29 +00:00
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2012-06-14 09:16:42 +00:00
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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, struct net *old_net)
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2007-09-27 05:04:26 +00:00
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{
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2012-06-14 09:16:42 +00:00
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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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2007-09-27 05:04:26 +00:00
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}
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2012-06-14 09:16:42 +00:00
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#endif /* CONFIG_NET_NS */
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2008-04-02 07:09:29 +00:00
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extern struct list_head net_namespace_list;
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2007-09-27 05:04:26 +00:00
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2009-07-10 09:51:35 +00:00
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extern struct net *get_net_ns_by_pid(pid_t pid);
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2011-05-05 00:51:50 +00:00
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extern struct net *get_net_ns_by_fd(int pid);
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2009-07-10 09:51:35 +00:00
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2007-11-01 07:43:49 +00:00
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#ifdef CONFIG_NET_NS
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2007-09-12 09:50:50 +00:00
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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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2007-09-13 07:18:57 +00:00
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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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2007-09-12 09:50:50 +00:00
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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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2008-03-25 18:57:35 +00:00
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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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2011-06-09 01:13:01 +00:00
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extern void net_drop_ns(void *);
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2007-11-01 07:43:49 +00:00
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#else
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2008-06-21 05:16:51 +00:00
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2007-11-01 07:43:49 +00:00
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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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2008-04-16 08:58:04 +00:00
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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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2011-06-09 01:13:01 +00:00
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#define net_drop_ns NULL
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2008-04-16 08:58:04 +00:00
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#endif
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#ifdef NETNS_REFCNT_DEBUG
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2007-11-01 07:43:49 +00:00
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static inline struct net *hold_net(struct net *net)
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{
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2008-04-16 08:58:04 +00:00
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if (net)
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atomic_inc(&net->use_count);
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2007-11-01 07:43:49 +00:00
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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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2008-04-16 08:58:04 +00:00
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if (net)
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atomic_dec(&net->use_count);
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2007-11-01 07:43:49 +00:00
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}
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2008-04-16 08:58:04 +00:00
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#else
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static inline struct net *hold_net(struct net *net)
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2007-11-01 07:43:49 +00:00
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{
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return net;
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}
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2008-03-25 18:57:35 +00:00
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2008-04-16 08:58:04 +00:00
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static inline void release_net(struct net *net)
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2008-03-25 18:57:35 +00:00
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{
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}
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2007-11-01 07:43:49 +00:00
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#endif
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2007-09-12 09:50:50 +00:00
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2008-11-12 08:53:30 +00:00
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#ifdef CONFIG_NET_NS
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static inline void write_pnet(struct net **pnet, struct net *net)
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{
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*pnet = net;
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}
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static inline struct net *read_pnet(struct net * const *pnet)
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{
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return *pnet;
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}
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#else
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#define write_pnet(pnet, net) do { (void)(net);} while (0)
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#define read_pnet(pnet) (&init_net)
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#endif
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2008-04-16 08:58:04 +00:00
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2007-09-12 09:50:50 +00:00
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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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2009-07-10 09:51:33 +00:00
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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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2007-10-09 03:38:39 +00:00
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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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2007-11-13 11:23:50 +00:00
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#define __net_initdata
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2012-10-05 00:12:11 +00:00
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#define __net_initconst
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2007-10-09 03:38:39 +00:00
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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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2007-11-13 11:23:50 +00:00
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#define __net_initdata __initdata
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2012-10-05 00:12:11 +00:00
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#define __net_initconst __initconst
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2007-10-09 03:38:39 +00:00
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#endif
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2007-09-12 09:50:50 +00:00
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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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2009-12-03 02:29:03 +00:00
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void (*exit_batch)(struct list_head *net_exit_list);
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2009-11-29 22:25:28 +00:00
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int *id;
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size_t size;
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2007-09-12 09:50:50 +00:00
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};
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2009-02-22 08:11:09 +00:00
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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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2009-07-15 06:16:34 +00:00
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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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2009-02-22 08:11:09 +00:00
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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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2007-09-12 09:50:50 +00:00
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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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2009-11-29 22:25:28 +00:00
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2007-11-30 12:55:42 +00:00
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struct ctl_table;
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struct ctl_table_header;
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2008-05-19 20:45:33 +00:00
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2012-04-19 13:20:32 +00:00
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#ifdef CONFIG_SYSCTL
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extern int net_sysctl_init(void);
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2012-04-19 13:18:47 +00:00
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extern 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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2007-11-30 12:55:42 +00:00
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extern void unregister_net_sysctl_table(struct ctl_table_header *header);
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2012-04-23 12:13:02 +00:00
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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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2012-09-10 22:09:44 +00:00
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static inline int rt_genid(struct net *net)
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{
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return atomic_read(&net->rt_genid);
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}
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static inline void rt_genid_bump(struct net *net)
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{
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atomic_inc(&net->rt_genid);
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}
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2007-11-30 12:55:42 +00:00
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2007-09-12 09:50:50 +00:00
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#endif /* __NET_NET_NAMESPACE_H */
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