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, 1014 insertions, 0 deletions

diff --git a/net/sched/em_meta.c b/net/sched/em_meta.c
new file mode 100644
index 000000000..49bae3d50
--- /dev/null
+++ b/net/sched/em_meta.c
@@ -0,0 +1,1014 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * net/sched/em_meta.c	Metadata ematch
+ *
+ * Authors:	Thomas Graf <tgraf@suug.ch>
+ *
+ * ==========================================================================
+ *
+ * 	The metadata ematch compares two meta objects where each object
+ * 	represents either a meta value stored in the kernel or a static
+ * 	value provided by userspace. The objects are not provided by
+ * 	userspace itself but rather a definition providing the information
+ * 	to build them. Every object is of a certain type which must be
+ * 	equal to the object it is being compared to.
+ *
+ * 	The definition of a objects conists of the type (meta type), a
+ * 	identifier (meta id) and additional type specific information.
+ * 	The meta id is either TCF_META_TYPE_VALUE for values provided by
+ * 	userspace or a index to the meta operations table consisting of
+ * 	function pointers to type specific meta data collectors returning
+ * 	the value of the requested meta value.
+ *
+ * 	         lvalue                                   rvalue
+ * 	      +-----------+                           +-----------+
+ * 	      | type: INT |                           | type: INT |
+ * 	 def  | id: DEV   |                           | id: VALUE |
+ * 	      | data:     |                           | data: 3   |
+ * 	      +-----------+                           +-----------+
+ * 	            |                                       |
+ * 	            ---> meta_ops[INT][DEV](...)            |
+ *	                      |                             |
+ * 	            -----------                             |
+ * 	            V                                       V
+ * 	      +-----------+                           +-----------+
+ * 	      | type: INT |                           | type: INT |
+ * 	 obj  | id: DEV |                             | id: VALUE |
+ * 	      | data: 2   |<--data got filled out     | data: 3   |
+ * 	      +-----------+                           +-----------+
+ * 	            |                                         |
+ * 	            --------------> 2  equals 3 <--------------
+ *
+ * 	This is a simplified schema, the complexity varies depending
+ * 	on the meta type. Obviously, the length of the data must also
+ * 	be provided for non-numeric types.
+ *
+ * 	Additionally, type dependent modifiers such as shift operators
+ * 	or mask may be applied to extend the functionaliy. As of now,
+ * 	the variable length type supports shifting the byte string to
+ * 	the right, eating up any number of octets and thus supporting
+ * 	wildcard interface name comparisons such as "ppp%" matching
+ * 	ppp0..9.
+ *
+ * 	NOTE: Certain meta values depend on other subsystems and are
+ * 	      only available if that subsystem is enabled in the kernel.
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/sched/loadavg.h>
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <linux/random.h>
+#include <linux/if_vlan.h>
+#include <linux/tc_ematch/tc_em_meta.h>
+#include <net/dst.h>
+#include <net/route.h>
+#include <net/pkt_cls.h>
+#include <net/sock.h>
+
+struct meta_obj {
+	unsigned long		value;
+	unsigned int		len;
+};
+
+struct meta_value {
+	struct tcf_meta_val	hdr;
+	unsigned long		val;
+	unsigned int		len;
+};
+
+struct meta_match {
+	struct meta_value	lvalue;
+	struct meta_value	rvalue;
+};
+
+static inline int meta_id(struct meta_value *v)
+{
+	return TCF_META_ID(v->hdr.kind);
+}
+
+static inline int meta_type(struct meta_value *v)
+{
+	return TCF_META_TYPE(v->hdr.kind);
+}
+
+#define META_COLLECTOR(FUNC) static void meta_##FUNC(struct sk_buff *skb, \
+	struct tcf_pkt_info *info, struct meta_value *v, \
+	struct meta_obj *dst, int *err)
+
+/**************************************************************************
+ * System status & misc
+ **************************************************************************/
+
+META_COLLECTOR(int_random)
+{
+	get_random_bytes(&dst->value, sizeof(dst->value));
+}
+
+static inline unsigned long fixed_loadavg(int load)
+{
+	int rnd_load = load + (FIXED_1/200);
+	int rnd_frac = ((rnd_load & (FIXED_1-1)) * 100) >> FSHIFT;
+
+	return ((rnd_load >> FSHIFT) * 100) + rnd_frac;
+}
+
+META_COLLECTOR(int_loadavg_0)
+{
+	dst->value = fixed_loadavg(avenrun[0]);
+}
+
+META_COLLECTOR(int_loadavg_1)
+{
+	dst->value = fixed_loadavg(avenrun[1]);
+}
+
+META_COLLECTOR(int_loadavg_2)
+{
+	dst->value = fixed_loadavg(avenrun[2]);
+}
+
+/**************************************************************************
+ * Device names & indices
+ **************************************************************************/
+
+static inline int int_dev(struct net_device *dev, struct meta_obj *dst)
+{
+	if (unlikely(dev == NULL))
+		return -1;
+
+	dst->value = dev->ifindex;
+	return 0;
+}
+
+static inline int var_dev(struct net_device *dev, struct meta_obj *dst)
+{
+	if (unlikely(dev == NULL))
+		return -1;
+
+	dst->value = (unsigned long) dev->name;
+	dst->len = strlen(dev->name);
+	return 0;
+}
+
+META_COLLECTOR(int_dev)
+{
+	*err = int_dev(skb->dev, dst);
+}
+
+META_COLLECTOR(var_dev)
+{
+	*err = var_dev(skb->dev, dst);
+}
+
+/**************************************************************************
+ * vlan tag
+ **************************************************************************/
+
+META_COLLECTOR(int_vlan_tag)
+{
+	unsigned short tag;
+
+	if (skb_vlan_tag_present(skb))
+		dst->value = skb_vlan_tag_get(skb);
+	else if (!__vlan_get_tag(skb, &tag))
+		dst->value = tag;
+	else
+		*err = -1;
+}
+
+
+
+/**************************************************************************
+ * skb attributes
+ **************************************************************************/
+
+META_COLLECTOR(int_priority)
+{
+	dst->value = skb->priority;
+}
+
+META_COLLECTOR(int_protocol)
+{
+	/* Let userspace take care of the byte ordering */
+	dst->value = skb_protocol(skb, false);
+}
+
+META_COLLECTOR(int_pkttype)
+{
+	dst->value = skb->pkt_type;
+}
+
+META_COLLECTOR(int_pktlen)
+{
+	dst->value = skb->len;
+}
+
+META_COLLECTOR(int_datalen)
+{
+	dst->value = skb->data_len;
+}
+
+META_COLLECTOR(int_maclen)
+{
+	dst->value = skb->mac_len;
+}
+
+META_COLLECTOR(int_rxhash)
+{
+	dst->value = skb_get_hash(skb);
+}
+
+/**************************************************************************
+ * Netfilter
+ **************************************************************************/
+
+META_COLLECTOR(int_mark)
+{
+	dst->value = skb->mark;
+}
+
+/**************************************************************************
+ * Traffic Control
+ **************************************************************************/
+
+META_COLLECTOR(int_tcindex)
+{
+	dst->value = skb->tc_index;
+}
+
+/**************************************************************************
+ * Routing
+ **************************************************************************/
+
+META_COLLECTOR(int_rtclassid)
+{
+	if (unlikely(skb_dst(skb) == NULL))
+		*err = -1;
+	else
+#ifdef CONFIG_IP_ROUTE_CLASSID
+		dst->value = skb_dst(skb)->tclassid;
+#else
+		dst->value = 0;
+#endif
+}
+
+META_COLLECTOR(int_rtiif)
+{
+	if (unlikely(skb_rtable(skb) == NULL))
+		*err = -1;
+	else
+		dst->value = inet_iif(skb);
+}
+
+/**************************************************************************
+ * Socket Attributes
+ **************************************************************************/
+
+#define skip_nonlocal(skb) \
+	(unlikely(skb->sk == NULL))
+
+META_COLLECTOR(int_sk_family)
+{
+	if (skip_nonlocal(skb)) {
+		*err = -1;
+		return;
+	}
+	dst->value = skb->sk->sk_family;
+}
+
+META_COLLECTOR(int_sk_state)
+{
+	if (skip_nonlocal(skb)) {
+		*err = -1;
+		return;
+	}
+	dst->value = skb->sk->sk_state;
+}
+
+META_COLLECTOR(int_sk_reuse)
+{
+	if (skip_nonlocal(skb)) {
+		*err = -1;
+		return;
+	}
+	dst->value = skb->sk->sk_reuse;
+}
+
+META_COLLECTOR(int_sk_bound_if)
+{
+	if (skip_nonlocal(skb)) {
+		*err = -1;
+		return;
+	}
+	/* No error if bound_dev_if is 0, legal userspace check */
+	dst->value = skb->sk->sk_bound_dev_if;
+}
+
+META_COLLECTOR(var_sk_bound_if)
+{
+	int bound_dev_if;
+
+	if (skip_nonlocal(skb)) {
+		*err = -1;
+		return;
+	}
+
+	bound_dev_if = READ_ONCE(skb->sk->sk_bound_dev_if);
+	if (bound_dev_if == 0) {
+		dst->value = (unsigned long) "any";
+		dst->len = 3;
+	} else {
+		struct net_device *dev;
+
+		rcu_read_lock();
+		dev = dev_get_by_index_rcu(sock_net(skb->sk),
+					   bound_dev_if);
+		*err = var_dev(dev, dst);
+		rcu_read_unlock();
+	}
+}
+
+META_COLLECTOR(int_sk_refcnt)
+{
+	if (skip_nonlocal(skb)) {
+		*err = -1;
+		return;
+	}
+	dst->value = refcount_read(&skb->sk->sk_refcnt);
+}
+
+META_COLLECTOR(int_sk_rcvbuf)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk->sk_rcvbuf;
+}
+
+META_COLLECTOR(int_sk_shutdown)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk->sk_shutdown;
+}
+
+META_COLLECTOR(int_sk_proto)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk->sk_protocol;
+}
+
+META_COLLECTOR(int_sk_type)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk->sk_type;
+}
+
+META_COLLECTOR(int_sk_rmem_alloc)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk_rmem_alloc_get(sk);
+}
+
+META_COLLECTOR(int_sk_wmem_alloc)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk_wmem_alloc_get(sk);
+}
+
+META_COLLECTOR(int_sk_omem_alloc)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = atomic_read(&sk->sk_omem_alloc);
+}
+
+META_COLLECTOR(int_sk_rcv_qlen)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk->sk_receive_queue.qlen;
+}
+
+META_COLLECTOR(int_sk_snd_qlen)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk->sk_write_queue.qlen;
+}
+
+META_COLLECTOR(int_sk_wmem_queued)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = READ_ONCE(sk->sk_wmem_queued);
+}
+
+META_COLLECTOR(int_sk_fwd_alloc)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk_forward_alloc_get(sk);
+}
+
+META_COLLECTOR(int_sk_sndbuf)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk->sk_sndbuf;
+}
+
+META_COLLECTOR(int_sk_alloc)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = (__force int) sk->sk_allocation;
+}
+
+META_COLLECTOR(int_sk_hash)
+{
+	if (skip_nonlocal(skb)) {
+		*err = -1;
+		return;
+	}
+	dst->value = skb->sk->sk_hash;
+}
+
+META_COLLECTOR(int_sk_lingertime)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk->sk_lingertime / HZ;
+}
+
+META_COLLECTOR(int_sk_err_qlen)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk->sk_error_queue.qlen;
+}
+
+META_COLLECTOR(int_sk_ack_bl)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = READ_ONCE(sk->sk_ack_backlog);
+}
+
+META_COLLECTOR(int_sk_max_ack_bl)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = READ_ONCE(sk->sk_max_ack_backlog);
+}
+
+META_COLLECTOR(int_sk_prio)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk->sk_priority;
+}
+
+META_COLLECTOR(int_sk_rcvlowat)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = READ_ONCE(sk->sk_rcvlowat);
+}
+
+META_COLLECTOR(int_sk_rcvtimeo)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk->sk_rcvtimeo / HZ;
+}
+
+META_COLLECTOR(int_sk_sndtimeo)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk->sk_sndtimeo / HZ;
+}
+
+META_COLLECTOR(int_sk_sendmsg_off)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk->sk_frag.offset;
+}
+
+META_COLLECTOR(int_sk_write_pend)
+{
+	const struct sock *sk = skb_to_full_sk(skb);
+
+	if (!sk) {
+		*err = -1;
+		return;
+	}
+	dst->value = sk->sk_write_pending;
+}
+
+/**************************************************************************
+ * Meta value collectors assignment table
+ **************************************************************************/
+
+struct meta_ops {
+	void		(*get)(struct sk_buff *, struct tcf_pkt_info *,
+			       struct meta_value *, struct meta_obj *, int *);
+};
+
+#define META_ID(name) TCF_META_ID_##name
+#define META_FUNC(name) { .get = meta_##name }
+
+/* Meta value operations table listing all meta value collectors and
+ * assigns them to a type and meta id. */
+static struct meta_ops __meta_ops[TCF_META_TYPE_MAX + 1][TCF_META_ID_MAX + 1] = {
+	[TCF_META_TYPE_VAR] = {
+		[META_ID(DEV)]			= META_FUNC(var_dev),
+		[META_ID(SK_BOUND_IF)] 		= META_FUNC(var_sk_bound_if),
+	},
+	[TCF_META_TYPE_INT] = {
+		[META_ID(RANDOM)]		= META_FUNC(int_random),
+		[META_ID(LOADAVG_0)]		= META_FUNC(int_loadavg_0),
+		[META_ID(LOADAVG_1)]		= META_FUNC(int_loadavg_1),
+		[META_ID(LOADAVG_2)]		= META_FUNC(int_loadavg_2),
+		[META_ID(DEV)]			= META_FUNC(int_dev),
+		[META_ID(PRIORITY)]		= META_FUNC(int_priority),
+		[META_ID(PROTOCOL)]		= META_FUNC(int_protocol),
+		[META_ID(PKTTYPE)]		= META_FUNC(int_pkttype),
+		[META_ID(PKTLEN)]		= META_FUNC(int_pktlen),
+		[META_ID(DATALEN)]		= META_FUNC(int_datalen),
+		[META_ID(MACLEN)]		= META_FUNC(int_maclen),
+		[META_ID(NFMARK)]		= META_FUNC(int_mark),
+		[META_ID(TCINDEX)]		= META_FUNC(int_tcindex),
+		[META_ID(RTCLASSID)]		= META_FUNC(int_rtclassid),
+		[META_ID(RTIIF)]		= META_FUNC(int_rtiif),
+		[META_ID(SK_FAMILY)]		= META_FUNC(int_sk_family),
+		[META_ID(SK_STATE)]		= META_FUNC(int_sk_state),
+		[META_ID(SK_REUSE)]		= META_FUNC(int_sk_reuse),
+		[META_ID(SK_BOUND_IF)]		= META_FUNC(int_sk_bound_if),
+		[META_ID(SK_REFCNT)]		= META_FUNC(int_sk_refcnt),
+		[META_ID(SK_RCVBUF)]		= META_FUNC(int_sk_rcvbuf),
+		[META_ID(SK_SNDBUF)]		= META_FUNC(int_sk_sndbuf),
+		[META_ID(SK_SHUTDOWN)]		= META_FUNC(int_sk_shutdown),
+		[META_ID(SK_PROTO)]		= META_FUNC(int_sk_proto),
+		[META_ID(SK_TYPE)]		= META_FUNC(int_sk_type),
+		[META_ID(SK_RMEM_ALLOC)]	= META_FUNC(int_sk_rmem_alloc),
+		[META_ID(SK_WMEM_ALLOC)]	= META_FUNC(int_sk_wmem_alloc),
+		[META_ID(SK_OMEM_ALLOC)]	= META_FUNC(int_sk_omem_alloc),
+		[META_ID(SK_WMEM_QUEUED)]	= META_FUNC(int_sk_wmem_queued),
+		[META_ID(SK_RCV_QLEN)]		= META_FUNC(int_sk_rcv_qlen),
+		[META_ID(SK_SND_QLEN)]		= META_FUNC(int_sk_snd_qlen),
+		[META_ID(SK_ERR_QLEN)]		= META_FUNC(int_sk_err_qlen),
+		[META_ID(SK_FORWARD_ALLOCS)]	= META_FUNC(int_sk_fwd_alloc),
+		[META_ID(SK_ALLOCS)]		= META_FUNC(int_sk_alloc),
+		[META_ID(SK_HASH)]		= META_FUNC(int_sk_hash),
+		[META_ID(SK_LINGERTIME)]	= META_FUNC(int_sk_lingertime),
+		[META_ID(SK_ACK_BACKLOG)]	= META_FUNC(int_sk_ack_bl),
+		[META_ID(SK_MAX_ACK_BACKLOG)]	= META_FUNC(int_sk_max_ack_bl),
+		[META_ID(SK_PRIO)]		= META_FUNC(int_sk_prio),
+		[META_ID(SK_RCVLOWAT)]		= META_FUNC(int_sk_rcvlowat),
+		[META_ID(SK_RCVTIMEO)]		= META_FUNC(int_sk_rcvtimeo),
+		[META_ID(SK_SNDTIMEO)]		= META_FUNC(int_sk_sndtimeo),
+		[META_ID(SK_SENDMSG_OFF)]	= META_FUNC(int_sk_sendmsg_off),
+		[META_ID(SK_WRITE_PENDING)]	= META_FUNC(int_sk_write_pend),
+		[META_ID(VLAN_TAG)]		= META_FUNC(int_vlan_tag),
+		[META_ID(RXHASH)]		= META_FUNC(int_rxhash),
+	}
+};
+
+static inline struct meta_ops *meta_ops(struct meta_value *val)
+{
+	return &__meta_ops[meta_type(val)][meta_id(val)];
+}
+
+/**************************************************************************
+ * Type specific operations for TCF_META_TYPE_VAR
+ **************************************************************************/
+
+static int meta_var_compare(struct meta_obj *a, struct meta_obj *b)
+{
+	int r = a->len - b->len;
+
+	if (r == 0)
+		r = memcmp((void *) a->value, (void *) b->value, a->len);
+
+	return r;
+}
+
+static int meta_var_change(struct meta_value *dst, struct nlattr *nla)
+{
+	int len = nla_len(nla);
+
+	dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL);
+	if (dst->val == 0UL)
+		return -ENOMEM;
+	dst->len = len;
+	return 0;
+}
+
+static void meta_var_destroy(struct meta_value *v)
+{
+	kfree((void *) v->val);
+}
+
+static void meta_var_apply_extras(struct meta_value *v,
+				  struct meta_obj *dst)
+{
+	int shift = v->hdr.shift;
+
+	if (shift && shift < dst->len)
+		dst->len -= shift;
+}
+
+static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
+{
+	if (v->val && v->len &&
+	    nla_put(skb, tlv, v->len, (void *) v->val))
+		goto nla_put_failure;
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
+/**************************************************************************
+ * Type specific operations for TCF_META_TYPE_INT
+ **************************************************************************/
+
+static int meta_int_compare(struct meta_obj *a, struct meta_obj *b)
+{
+	/* Let gcc optimize it, the unlikely is not really based on
+	 * some numbers but jump free code for mismatches seems
+	 * more logical. */
+	if (unlikely(a->value == b->value))
+		return 0;
+	else if (a->value < b->value)
+		return -1;
+	else
+		return 1;
+}
+
+static int meta_int_change(struct meta_value *dst, struct nlattr *nla)
+{
+	if (nla_len(nla) >= sizeof(unsigned long)) {
+		dst->val = *(unsigned long *) nla_data(nla);
+		dst->len = sizeof(unsigned long);
+	} else if (nla_len(nla) == sizeof(u32)) {
+		dst->val = nla_get_u32(nla);
+		dst->len = sizeof(u32);
+	} else
+		return -EINVAL;
+
+	return 0;
+}
+
+static void meta_int_apply_extras(struct meta_value *v,
+				  struct meta_obj *dst)
+{
+	if (v->hdr.shift)
+		dst->value >>= v->hdr.shift;
+
+	if (v->val)
+		dst->value &= v->val;
+}
+
+static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv)
+{
+	if (v->len == sizeof(unsigned long)) {
+		if (nla_put(skb, tlv, sizeof(unsigned long), &v->val))
+			goto nla_put_failure;
+	} else if (v->len == sizeof(u32)) {
+		if (nla_put_u32(skb, tlv, v->val))
+			goto nla_put_failure;
+	}
+
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
+/**************************************************************************
+ * Type specific operations table
+ **************************************************************************/
+
+struct meta_type_ops {
+	void	(*destroy)(struct meta_value *);
+	int	(*compare)(struct meta_obj *, struct meta_obj *);
+	int	(*change)(struct meta_value *, struct nlattr *);
+	void	(*apply_extras)(struct meta_value *, struct meta_obj *);
+	int	(*dump)(struct sk_buff *, struct meta_value *, int);
+};
+
+static const struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX + 1] = {
+	[TCF_META_TYPE_VAR] = {
+		.destroy = meta_var_destroy,
+		.compare = meta_var_compare,
+		.change = meta_var_change,
+		.apply_extras = meta_var_apply_extras,
+		.dump = meta_var_dump
+	},
+	[TCF_META_TYPE_INT] = {
+		.compare = meta_int_compare,
+		.change = meta_int_change,
+		.apply_extras = meta_int_apply_extras,
+		.dump = meta_int_dump
+	}
+};
+
+static inline const struct meta_type_ops *meta_type_ops(struct meta_value *v)
+{
+	return &__meta_type_ops[meta_type(v)];
+}
+
+/**************************************************************************
+ * Core
+ **************************************************************************/
+
+static int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info,
+		    struct meta_value *v, struct meta_obj *dst)
+{
+	int err = 0;
+
+	if (meta_id(v) == TCF_META_ID_VALUE) {
+		dst->value = v->val;
+		dst->len = v->len;
+		return 0;
+	}
+
+	meta_ops(v)->get(skb, info, v, dst, &err);
+	if (err < 0)
+		return err;
+
+	if (meta_type_ops(v)->apply_extras)
+		meta_type_ops(v)->apply_extras(v, dst);
+
+	return 0;
+}
+
+static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m,
+			 struct tcf_pkt_info *info)
+{
+	int r;
+	struct meta_match *meta = (struct meta_match *) m->data;
+	struct meta_obj l_value, r_value;
+
+	if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 ||
+	    meta_get(skb, info, &meta->rvalue, &r_value) < 0)
+		return 0;
+
+	r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value);
+
+	switch (meta->lvalue.hdr.op) {
+	case TCF_EM_OPND_EQ:
+		return !r;
+	case TCF_EM_OPND_LT:
+		return r < 0;
+	case TCF_EM_OPND_GT:
+		return r > 0;
+	}
+
+	return 0;
+}
+
+static void meta_delete(struct meta_match *meta)
+{
+	if (meta) {
+		const struct meta_type_ops *ops = meta_type_ops(&meta->lvalue);
+
+		if (ops && ops->destroy) {
+			ops->destroy(&meta->lvalue);
+			ops->destroy(&meta->rvalue);
+		}
+	}
+
+	kfree(meta);
+}
+
+static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla)
+{
+	if (nla) {
+		if (nla_len(nla) == 0)
+			return -EINVAL;
+
+		return meta_type_ops(dst)->change(dst, nla);
+	}
+
+	return 0;
+}
+
+static inline int meta_is_supported(struct meta_value *val)
+{
+	return !meta_id(val) || meta_ops(val)->get;
+}
+
+static const struct nla_policy meta_policy[TCA_EM_META_MAX + 1] = {
+	[TCA_EM_META_HDR]	= { .len = sizeof(struct tcf_meta_hdr) },
+};
+
+static int em_meta_change(struct net *net, void *data, int len,
+			  struct tcf_ematch *m)
+{
+	int err;
+	struct nlattr *tb[TCA_EM_META_MAX + 1];
+	struct tcf_meta_hdr *hdr;
+	struct meta_match *meta = NULL;
+
+	err = nla_parse_deprecated(tb, TCA_EM_META_MAX, data, len,
+				   meta_policy, NULL);
+	if (err < 0)
+		goto errout;
+
+	err = -EINVAL;
+	if (tb[TCA_EM_META_HDR] == NULL)
+		goto errout;
+	hdr = nla_data(tb[TCA_EM_META_HDR]);
+
+	if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) ||
+	    TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX ||
+	    TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX ||
+	    TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX)
+		goto errout;
+
+	meta = kzalloc(sizeof(*meta), GFP_KERNEL);
+	if (meta == NULL) {
+		err = -ENOMEM;
+		goto errout;
+	}
+
+	memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left));
+	memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right));
+
+	if (!meta_is_supported(&meta->lvalue) ||
+	    !meta_is_supported(&meta->rvalue)) {
+		err = -EOPNOTSUPP;
+		goto errout;
+	}
+
+	if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 ||
+	    meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0)
+		goto errout;
+
+	m->datalen = sizeof(*meta);
+	m->data = (unsigned long) meta;
+
+	err = 0;
+errout:
+	if (err && meta)
+		meta_delete(meta);
+	return err;
+}
+
+static void em_meta_destroy(struct tcf_ematch *m)
+{
+	if (m)
+		meta_delete((struct meta_match *) m->data);
+}
+
+static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em)
+{
+	struct meta_match *meta = (struct meta_match *) em->data;
+	struct tcf_meta_hdr hdr;
+	const struct meta_type_ops *ops;
+
+	memset(&hdr, 0, sizeof(hdr));
+	memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left));
+	memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right));
+
+	if (nla_put(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr))
+		goto nla_put_failure;
+
+	ops = meta_type_ops(&meta->lvalue);
+	if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 ||
+	    ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0)
+		goto nla_put_failure;
+
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
+static struct tcf_ematch_ops em_meta_ops = {
+	.kind	  = TCF_EM_META,
+	.change	  = em_meta_change,
+	.match	  = em_meta_match,
+	.destroy  = em_meta_destroy,
+	.dump	  = em_meta_dump,
+	.owner	  = THIS_MODULE,
+	.link	  = LIST_HEAD_INIT(em_meta_ops.link)
+};
+
+static int __init init_em_meta(void)
+{
+	return tcf_em_register(&em_meta_ops);
+}
+
+static void __exit exit_em_meta(void)
+{
+	tcf_em_unregister(&em_meta_ops);
+}
+
+MODULE_LICENSE("GPL");
+
+module_init(init_em_meta);
+module_exit(exit_em_meta);
+
+MODULE_ALIAS_TCF_EMATCH(TCF_EM_META);