Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 544 insertions, 0 deletions

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
new file mode 100644
index 000000000..78beaa765
--- /dev/null
+++ b/include/net/net_namespace.h
@@ -0,0 +1,544 @@
+/* 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/nexthop.h>
+#include <net/netns/ieee802154_6lowpan.h>
+#include <net/netns/sctp.h>
+#include <net/netns/netfilter.h>
+#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
+#include <net/netns/conntrack.h>
+#endif
+#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
+#include <net/netns/flow_table.h>
+#endif
+#include <net/netns/nftables.h>
+#include <net/netns/xfrm.h>
+#include <net/netns/mpls.h>
+#include <net/netns/can.h>
+#include <net/netns/xdp.h>
+#include <net/netns/smc.h>
+#include <net/netns/bpf.h>
+#include <net/netns/mctp.h>
+#include <net/net_trackers.h>
+#include <linux/ns_common.h>
+#include <linux/idr.h>
+#include <linux/skbuff.h>
+#include <linux/notifier.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;
+struct bpf_prog;
+
+
+#define NETDEV_HASHBITS    8
+#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
+
+struct net {
+	/* First cache line can be often dirtied.
+	 * Do not place here read-mostly fields.
+	 */
+	refcount_t		passive;	/* To decide when the network
+						 * namespace should be freed.
+						 */
+	spinlock_t		rules_mod_lock;
+
+	atomic_t		dev_unreg_count;
+
+	unsigned int		dev_base_seq;	/* protected by rtnl_mutex */
+	int			ifindex;
+
+	spinlock_t		nsid_lock;
+	atomic_t		fnhe_genid;
+
+	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 */
+
+#ifdef CONFIG_KEYS
+	struct key_tag		*key_domain;	/* Key domain of operation tag */
+#endif
+	struct user_namespace   *user_ns;	/* Owning user namespace */
+	struct ucounts		*ucounts;
+	struct idr		netns_ids;
+
+	struct ns_common	ns;
+	struct ref_tracker_dir  refcnt_tracker;
+	struct ref_tracker_dir  notrefcnt_tracker; /* tracker for objects not
+						    * refcounted against netns
+						    */
+	struct list_head 	dev_base_head;
+	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 hlist_head 	*dev_name_head;
+	struct hlist_head	*dev_index_head;
+	struct raw_notifier_head	netdev_chain;
+
+	/* Note that @hash_mix can be read millions times per second,
+	 * it is critical that it is on a read_mostly cache line.
+	 */
+	u32			hash_mix;
+
+	struct net_device       *loopback_dev;          /* The loopback */
+
+	/* core fib_rules */
+	struct list_head	rules_ops;
+
+	struct netns_core	core;
+	struct netns_mib	mib;
+	struct netns_packet	packet;
+#if IS_ENABLED(CONFIG_UNIX)
+	struct netns_unix	unx;
+#endif
+	struct netns_nexthop	nexthop;
+	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
+#ifdef CONFIG_NETFILTER
+	struct netns_nf		nf;
+#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_FLOW_TABLE)
+	struct netns_ft ft;
+#endif
+#endif
+#ifdef CONFIG_WEXT_CORE
+	struct sk_buff_head	wext_nlevents;
+#endif
+	struct net_generic __rcu	*gen;
+
+	/* Used to store attached BPF programs */
+	struct netns_bpf	bpf;
+
+	/* Note : following structs are cache line aligned */
+#ifdef CONFIG_XFRM
+	struct netns_xfrm	xfrm;
+#endif
+
+	u64			net_cookie; /* written once */
+
+#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
+#ifdef CONFIG_XDP_SOCKETS
+	struct netns_xdp	xdp;
+#endif
+#if IS_ENABLED(CONFIG_MCTP)
+	struct netns_mctp	mctp;
+#endif
+#if IS_ENABLED(CONFIG_CRYPTO_USER)
+	struct sock		*crypto_nlsk;
+#endif
+	struct sock		*diag_nlsk;
+#if IS_ENABLED(CONFIG_SMC)
+	struct netns_smc	smc;
+#endif
+} __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);
+struct net *get_net_ns_by_fd(int fd);
+#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);
+}
+
+static inline struct net *get_net_ns_by_fd(int fd)
+{
+	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);
+
+#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);
+
+/* Try using get_net_track() instead */
+static inline struct net *get_net(struct net *net)
+{
+	refcount_inc(&net->ns.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->ns.count))
+		net = NULL;
+	return net;
+}
+
+/* Try using put_net_track() instead */
+static inline void put_net(struct net *net)
+{
+	if (refcount_dec_and_test(&net->ns.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->ns.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
+
+
+static inline void __netns_tracker_alloc(struct net *net,
+					 netns_tracker *tracker,
+					 bool refcounted,
+					 gfp_t gfp)
+{
+#ifdef CONFIG_NET_NS_REFCNT_TRACKER
+	ref_tracker_alloc(refcounted ? &net->refcnt_tracker :
+				       &net->notrefcnt_tracker,
+			  tracker, gfp);
+#endif
+}
+
+static inline void netns_tracker_alloc(struct net *net, netns_tracker *tracker,
+				       gfp_t gfp)
+{
+	__netns_tracker_alloc(net, tracker, true, gfp);
+}
+
+static inline void __netns_tracker_free(struct net *net,
+					netns_tracker *tracker,
+					bool refcounted)
+{
+#ifdef CONFIG_NET_NS_REFCNT_TRACKER
+       ref_tracker_free(refcounted ? &net->refcnt_tracker :
+				     &net->notrefcnt_tracker, tracker);
+#endif
+}
+
+static inline struct net *get_net_track(struct net *net,
+					netns_tracker *tracker, gfp_t gfp)
+{
+	get_net(net);
+	netns_tracker_alloc(net, tracker, gfp);
+	return net;
+}
+
+static inline void put_net_track(struct net *net, netns_tracker *tracker)
+{
+	__netns_tracker_free(net, tracker, true);
+	put_net(net);
+}
+
+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_continue_reverse(VAR)		\
+	list_for_each_entry_continue_reverse(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(const struct net *net, struct net *peer);
+bool peernet_has_id(const struct net *net, struct net *peer);
+struct net *get_net_ns_by_id(const 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.
+	 *
+	 * Note that a combination of pre_exit() and exit() can
+	 * be used, since a synchronize_rcu() is guaranteed between
+	 * the calls.
+	 */
+	int (*init)(struct net *net);
+	void (*pre_exit)(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;
+
+#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(const struct net *net)
+{
+	return atomic_read(&net->ipv4.rt_genid);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static inline int rt_genid_ipv6(const struct net *net)
+{
+	return atomic_read(&net->ipv6.fib6_sernum);
+}
+#endif
+
+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(const struct net *net)
+{
+	return atomic_read(&net->fnhe_genid);
+}
+
+static inline void fnhe_genid_bump(struct net *net)
+{
+	atomic_inc(&net->fnhe_genid);
+}
+
+#ifdef CONFIG_NET
+void net_ns_init(void);
+#else
+static inline void net_ns_init(void) {}
+#endif
+
+#endif /* __NET_NET_NAMESPACE_H */