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8e8cda6d73
This patch adds initial support for network namespaces. The changes only
enable support in the CAN raw, proc and af_can code. GW and BCM still
have their checks that ensure that they are used only from the main
namespace.
The patch boils down to moving the global structures, i.e. the global
filter list and their /proc stats, into a per-namespace structure and passing
around the corresponding "struct net" in a lot of different places.
Changes since v1:
- rebased on current HEAD (2bfe01e)
- fixed overlong line
Signed-off-by: Mario Kicherer <dev@kicherer.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
389 lines
9.2 KiB
C
389 lines
9.2 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 <linux/atomic.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 <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/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 <linux/ns_common.h>
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#include <linux/idr.h>
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#include <linux/skbuff.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 sock;
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struct netns_ipvs;
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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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atomic_t passive; /* To decided when the network
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* namespace should be freed.
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*/
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atomic_t count; /* To decided when the network
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* namespace should be shut down.
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*/
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spinlock_t rules_mod_lock;
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atomic64_t cookie_gen;
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struct list_head list; /* list of network namespaces */
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struct list_head cleanup_list; /* namespaces on death row */
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struct list_head exit_list; /* Use only net_mutex */
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struct user_namespace *user_ns; /* Owning user namespace */
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struct ucounts *ucounts;
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spinlock_t nsid_lock;
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struct idr netns_ids;
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struct ns_common ns;
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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 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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unsigned int dev_base_seq; /* protected by rtnl_mutex */
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int ifindex;
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unsigned int dev_unreg_count;
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/* core fib_rules */
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struct list_head rules_ops;
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struct net_device *loopback_dev; /* The loopback */
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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_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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#endif
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struct sock *nfnl;
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struct sock *nfnl_stash;
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#if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT)
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struct list_head nfnl_acct_list;
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#endif
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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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/* 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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#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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struct sock *diag_nlsk;
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atomic_t fnhe_genid;
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};
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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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#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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#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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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
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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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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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#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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#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_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);
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int peernet2id(struct net *net, struct net *peer);
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bool peernet_has_id(struct net *net, struct net *peer);
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struct net *get_net_ns_by_id(struct net *net, int id);
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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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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(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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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(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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