Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 450 insertions, 0 deletions

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
new file mode 100644
index 000000000..bc88ac6c2
--- /dev/null
+++ b/include/net/net_namespace.h
@@ -0,0 +1,450 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Operations on the network namespace
+ */
+#ifndef __NET_NET_NAMESPACE_H
+#define __NET_NET_NAMESPACE_H
+
+#include <linux/atomic.h>
+#include <linux/refcount.h>
+#include <linux/workqueue.h>
+#include <linux/list.h>
+#include <linux/sysctl.h>
+#include <linux/uidgid.h>
+
+#include <net/flow.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/ieee802154_6lowpan.h>
+#include <net/netns/sctp.h>
+#include <net/netns/dccp.h>
+#include <net/netns/netfilter.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/nftables.h>
+#include <net/netns/xfrm.h>
+#include <net/netns/mpls.h>
+#include <net/netns/can.h>
+#include <linux/ns_common.h>
+#include <linux/idr.h>
+#include <linux/skbuff.h>
+
+struct user_namespace;
+struct proc_dir_entry;
+struct net_device;
+struct sock;
+struct ctl_table_header;
+struct net_generic;
+struct uevent_sock;
+struct netns_ipvs;
+
+
+#define NETDEV_HASHBITS    8
+#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
+
+struct net {
+	refcount_t		passive;	/* To decided when the network
+						 * namespace should be freed.
+						 */
+	refcount_t		count;		/* To decided when the network
+						 *  namespace should be shut down.
+						 */
+	spinlock_t		rules_mod_lock;
+
+	u32			hash_mix;
+	atomic64_t		cookie_gen;
+
+	struct list_head	list;		/* list of network namespaces */
+	struct list_head	exit_list;	/* To linked to call pernet exit
+						 * methods on dead net (
+						 * pernet_ops_rwsem read locked),
+						 * or to unregister pernet ops
+						 * (pernet_ops_rwsem write locked).
+						 */
+	struct llist_node	cleanup_list;	/* namespaces on death row */
+
+	struct user_namespace   *user_ns;	/* Owning user namespace */
+	struct ucounts		*ucounts;
+	spinlock_t		nsid_lock;
+	struct idr		netns_ids;
+
+	struct ns_common	ns;
+
+	struct proc_dir_entry 	*proc_net;
+	struct proc_dir_entry 	*proc_net_stat;
+
+#ifdef CONFIG_SYSCTL
+	struct ctl_table_set	sysctls;
+#endif
+
+	struct sock 		*rtnl;			/* rtnetlink socket */
+	struct sock		*genl_sock;
+
+	struct uevent_sock	*uevent_sock;		/* uevent socket */
+
+	struct list_head 	dev_base_head;
+	struct hlist_head 	*dev_name_head;
+	struct hlist_head	*dev_index_head;
+	unsigned int		dev_base_seq;	/* protected by rtnl_mutex */
+	int			ifindex;
+	unsigned int		dev_unreg_count;
+
+	/* core fib_rules */
+	struct list_head	rules_ops;
+
+	struct list_head	fib_notifier_ops;  /* Populated by
+						    * register_pernet_subsys()
+						    */
+	struct net_device       *loopback_dev;          /* The loopback */
+	struct netns_core	core;
+	struct netns_mib	mib;
+	struct netns_packet	packet;
+	struct netns_unix	unx;
+	struct netns_ipv4	ipv4;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct netns_ipv6	ipv6;
+#endif
+#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
+	struct netns_ieee802154_lowpan	ieee802154_lowpan;
+#endif
+#if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
+	struct netns_sctp	sctp;
+#endif
+#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
+	struct netns_dccp	dccp;
+#endif
+#ifdef CONFIG_NETFILTER
+	struct netns_nf		nf;
+	struct netns_xt		xt;
+#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
+	struct netns_ct		ct;
+#endif
+#if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
+	struct netns_nftables	nft;
+#endif
+#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
+	struct netns_nf_frag	nf_frag;
+	struct ctl_table_header *nf_frag_frags_hdr;
+#endif
+	struct sock		*nfnl;
+	struct sock		*nfnl_stash;
+#if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT)
+	struct list_head        nfnl_acct_list;
+#endif
+#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
+	struct list_head	nfct_timeout_list;
+#endif
+#endif
+#ifdef CONFIG_WEXT_CORE
+	struct sk_buff_head	wext_nlevents;
+#endif
+	struct net_generic __rcu	*gen;
+
+	/* Note : following structs are cache line aligned */
+#ifdef CONFIG_XFRM
+	struct netns_xfrm	xfrm;
+#endif
+#if IS_ENABLED(CONFIG_IP_VS)
+	struct netns_ipvs	*ipvs;
+#endif
+#if IS_ENABLED(CONFIG_MPLS)
+	struct netns_mpls	mpls;
+#endif
+#if IS_ENABLED(CONFIG_CAN)
+	struct netns_can	can;
+#endif
+	struct sock		*diag_nlsk;
+	atomic_t		fnhe_genid;
+} __randomize_layout;
+
+#include <linux/seq_file_net.h>
+
+/* Init's network namespace */
+extern struct net init_net;
+
+#ifdef CONFIG_NET_NS
+struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
+			struct net *old_net);
+
+void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid);
+
+void net_ns_barrier(void);
+
+struct ns_common *get_net_ns(struct ns_common *ns);
+#else /* CONFIG_NET_NS */
+#include <linux/sched.h>
+#include <linux/nsproxy.h>
+static inline struct net *copy_net_ns(unsigned long flags,
+	struct user_namespace *user_ns, struct net *old_net)
+{
+	if (flags & CLONE_NEWNET)
+		return ERR_PTR(-EINVAL);
+	return old_net;
+}
+
+static inline void net_ns_get_ownership(const struct net *net,
+					kuid_t *uid, kgid_t *gid)
+{
+	*uid = GLOBAL_ROOT_UID;
+	*gid = GLOBAL_ROOT_GID;
+}
+
+static inline void net_ns_barrier(void) {}
+
+static inline struct ns_common *get_net_ns(struct ns_common *ns)
+{
+	return ERR_PTR(-EINVAL);
+}
+#endif /* CONFIG_NET_NS */
+
+
+extern struct list_head net_namespace_list;
+
+struct net *get_net_ns_by_pid(pid_t pid);
+struct net *get_net_ns_by_fd(int fd);
+
+#ifdef CONFIG_SYSCTL
+void ipx_register_sysctl(void);
+void ipx_unregister_sysctl(void);
+#else
+#define ipx_register_sysctl()
+#define ipx_unregister_sysctl()
+#endif
+
+#ifdef CONFIG_NET_NS
+void __put_net(struct net *net);
+
+static inline struct net *get_net(struct net *net)
+{
+	refcount_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 (!refcount_inc_not_zero(&net->count))
+		net = NULL;
+	return net;
+}
+
+static inline void put_net(struct net *net)
+{
+	if (refcount_dec_and_test(&net->count))
+		__put_net(net);
+}
+
+static inline
+int net_eq(const struct net *net1, const struct net *net2)
+{
+	return net1 == net2;
+}
+
+static inline int check_net(const struct net *net)
+{
+	return refcount_read(&net->count) != 0;
+}
+
+void net_drop_ns(void *);
+
+#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;
+}
+
+static inline int check_net(const struct net *net)
+{
+	return 1;
+}
+
+#define net_drop_ns NULL
+#endif
+
+
+typedef struct {
+#ifdef CONFIG_NET_NS
+	struct net *net;
+#endif
+} possible_net_t;
+
+static inline void write_pnet(possible_net_t *pnet, struct net *net)
+{
+#ifdef CONFIG_NET_NS
+	pnet->net = net;
+#endif
+}
+
+static inline struct net *read_pnet(const possible_net_t *pnet)
+{
+#ifdef CONFIG_NET_NS
+	return pnet->net;
+#else
+	return &init_net;
+#endif
+}
+
+/* Protected by net_rwsem */
+#define for_each_net(VAR)				\
+	list_for_each_entry(VAR, &net_namespace_list, list)
+
+#define for_each_net_rcu(VAR)				\
+	list_for_each_entry_rcu(VAR, &net_namespace_list, list)
+
+#ifdef CONFIG_NET_NS
+#define __net_init
+#define __net_exit
+#define __net_initdata
+#define __net_initconst
+#else
+#define __net_init	__init
+#define __net_exit	__ref
+#define __net_initdata	__initdata
+#define __net_initconst	__initconst
+#endif
+
+int peernet2id_alloc(struct net *net, struct net *peer, gfp_t gfp);
+int peernet2id(struct net *net, struct net *peer);
+bool peernet_has_id(struct net *net, struct net *peer);
+struct net *get_net_ns_by_id(struct net *net, int id);
+
+struct pernet_operations {
+	struct list_head list;
+	/*
+	 * Below methods are called without any exclusive locks.
+	 * More than one net may be constructed and destructed
+	 * in parallel on several cpus. Every pernet_operations
+	 * have to keep in mind all other pernet_operations and
+	 * to introduce a locking, if they share common resources.
+	 *
+	 * The only time they are called with exclusive lock is
+	 * from register_pernet_subsys(), unregister_pernet_subsys()
+	 * register_pernet_device() and unregister_pernet_device().
+	 *
+	 * Exit methods using blocking RCU primitives, such as
+	 * synchronize_rcu(), should be implemented via exit_batch.
+	 * Then, destruction of a group of net requires single
+	 * synchronize_rcu() related to these pernet_operations,
+	 * instead of separate synchronize_rcu() for every net.
+	 * Please, avoid synchronize_rcu() at all, where it's possible.
+	 */
+	int (*init)(struct net *net);
+	void (*exit)(struct net *net);
+	void (*exit_batch)(struct list_head *net_exit_list);
+	unsigned int *id;
+	size_t size;
+};
+
+/*
+ * 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.
+ *
+ * Network interfaces need to be removed from a dying netns _before_
+ * subsys notifiers can be called, as most of the network code cleanup
+ * (which is done from subsys notifiers) 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.
+ */
+int register_pernet_subsys(struct pernet_operations *);
+void unregister_pernet_subsys(struct pernet_operations *);
+int register_pernet_device(struct pernet_operations *);
+void unregister_pernet_device(struct pernet_operations *);
+
+struct ctl_table;
+struct ctl_table_header;
+
+#ifdef CONFIG_SYSCTL
+int net_sysctl_init(void);
+struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
+					     struct ctl_table *table);
+void unregister_net_sysctl_table(struct ctl_table_header *header);
+#else
+static inline int net_sysctl_init(void) { return 0; }
+static inline struct ctl_table_header *register_net_sysctl(struct net *net,
+	const char *path, struct ctl_table *table)
+{
+	return NULL;
+}
+static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
+{
+}
+#endif
+
+static inline int rt_genid_ipv4(struct net *net)
+{
+	return atomic_read(&net->ipv4.rt_genid);
+}
+
+static inline void rt_genid_bump_ipv4(struct net *net)
+{
+	atomic_inc(&net->ipv4.rt_genid);
+}
+
+extern void (*__fib6_flush_trees)(struct net *net);
+static inline void rt_genid_bump_ipv6(struct net *net)
+{
+	if (__fib6_flush_trees)
+		__fib6_flush_trees(net);
+}
+
+#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
+static inline struct netns_ieee802154_lowpan *
+net_ieee802154_lowpan(struct net *net)
+{
+	return &net->ieee802154_lowpan;
+}
+#endif
+
+/* For callers who don't really care about whether it's IPv4 or IPv6 */
+static inline void rt_genid_bump_all(struct net *net)
+{
+	rt_genid_bump_ipv4(net);
+	rt_genid_bump_ipv6(net);
+}
+
+static inline int fnhe_genid(struct net *net)
+{
+	return atomic_read(&net->fnhe_genid);
+}
+
+static inline void fnhe_genid_bump(struct net *net)
+{
+	atomic_inc(&net->fnhe_genid);
+}
+
+#endif /* __NET_NET_NAMESPACE_H */