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, 979 insertions, 0 deletions

diff --git a/net/ipv6/ioam6.c b/net/ipv6/ioam6.c
new file mode 100644
index 000000000..571f0e4d9
--- /dev/null
+++ b/net/ipv6/ioam6.c
@@ -0,0 +1,979 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  IPv6 IOAM implementation
+ *
+ *  Author:
+ *  Justin Iurman <justin.iurman@uliege.be>
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/net.h>
+#include <linux/ioam6.h>
+#include <linux/ioam6_genl.h>
+#include <linux/rhashtable.h>
+#include <linux/netdevice.h>
+
+#include <net/addrconf.h>
+#include <net/genetlink.h>
+#include <net/ioam6.h>
+#include <net/sch_generic.h>
+
+static void ioam6_ns_release(struct ioam6_namespace *ns)
+{
+	kfree_rcu(ns, rcu);
+}
+
+static void ioam6_sc_release(struct ioam6_schema *sc)
+{
+	kfree_rcu(sc, rcu);
+}
+
+static void ioam6_free_ns(void *ptr, void *arg)
+{
+	struct ioam6_namespace *ns = (struct ioam6_namespace *)ptr;
+
+	if (ns)
+		ioam6_ns_release(ns);
+}
+
+static void ioam6_free_sc(void *ptr, void *arg)
+{
+	struct ioam6_schema *sc = (struct ioam6_schema *)ptr;
+
+	if (sc)
+		ioam6_sc_release(sc);
+}
+
+static int ioam6_ns_cmpfn(struct rhashtable_compare_arg *arg, const void *obj)
+{
+	const struct ioam6_namespace *ns = obj;
+
+	return (ns->id != *(__be16 *)arg->key);
+}
+
+static int ioam6_sc_cmpfn(struct rhashtable_compare_arg *arg, const void *obj)
+{
+	const struct ioam6_schema *sc = obj;
+
+	return (sc->id != *(u32 *)arg->key);
+}
+
+static const struct rhashtable_params rht_ns_params = {
+	.key_len		= sizeof(__be16),
+	.key_offset		= offsetof(struct ioam6_namespace, id),
+	.head_offset		= offsetof(struct ioam6_namespace, head),
+	.automatic_shrinking	= true,
+	.obj_cmpfn		= ioam6_ns_cmpfn,
+};
+
+static const struct rhashtable_params rht_sc_params = {
+	.key_len		= sizeof(u32),
+	.key_offset		= offsetof(struct ioam6_schema, id),
+	.head_offset		= offsetof(struct ioam6_schema, head),
+	.automatic_shrinking	= true,
+	.obj_cmpfn		= ioam6_sc_cmpfn,
+};
+
+static struct genl_family ioam6_genl_family;
+
+static const struct nla_policy ioam6_genl_policy_addns[] = {
+	[IOAM6_ATTR_NS_ID]	= { .type = NLA_U16 },
+	[IOAM6_ATTR_NS_DATA]	= { .type = NLA_U32 },
+	[IOAM6_ATTR_NS_DATA_WIDE] = { .type = NLA_U64 },
+};
+
+static const struct nla_policy ioam6_genl_policy_delns[] = {
+	[IOAM6_ATTR_NS_ID]	= { .type = NLA_U16 },
+};
+
+static const struct nla_policy ioam6_genl_policy_addsc[] = {
+	[IOAM6_ATTR_SC_ID]	= { .type = NLA_U32 },
+	[IOAM6_ATTR_SC_DATA]	= { .type = NLA_BINARY,
+				    .len = IOAM6_MAX_SCHEMA_DATA_LEN },
+};
+
+static const struct nla_policy ioam6_genl_policy_delsc[] = {
+	[IOAM6_ATTR_SC_ID]	= { .type = NLA_U32 },
+};
+
+static const struct nla_policy ioam6_genl_policy_ns_sc[] = {
+	[IOAM6_ATTR_NS_ID]	= { .type = NLA_U16 },
+	[IOAM6_ATTR_SC_ID]	= { .type = NLA_U32 },
+	[IOAM6_ATTR_SC_NONE]	= { .type = NLA_FLAG },
+};
+
+static int ioam6_genl_addns(struct sk_buff *skb, struct genl_info *info)
+{
+	struct ioam6_pernet_data *nsdata;
+	struct ioam6_namespace *ns;
+	u64 data64;
+	u32 data32;
+	__be16 id;
+	int err;
+
+	if (!info->attrs[IOAM6_ATTR_NS_ID])
+		return -EINVAL;
+
+	id = cpu_to_be16(nla_get_u16(info->attrs[IOAM6_ATTR_NS_ID]));
+	nsdata = ioam6_pernet(genl_info_net(info));
+
+	mutex_lock(&nsdata->lock);
+
+	ns = rhashtable_lookup_fast(&nsdata->namespaces, &id, rht_ns_params);
+	if (ns) {
+		err = -EEXIST;
+		goto out_unlock;
+	}
+
+	ns = kzalloc(sizeof(*ns), GFP_KERNEL);
+	if (!ns) {
+		err = -ENOMEM;
+		goto out_unlock;
+	}
+
+	ns->id = id;
+
+	if (!info->attrs[IOAM6_ATTR_NS_DATA])
+		data32 = IOAM6_U32_UNAVAILABLE;
+	else
+		data32 = nla_get_u32(info->attrs[IOAM6_ATTR_NS_DATA]);
+
+	if (!info->attrs[IOAM6_ATTR_NS_DATA_WIDE])
+		data64 = IOAM6_U64_UNAVAILABLE;
+	else
+		data64 = nla_get_u64(info->attrs[IOAM6_ATTR_NS_DATA_WIDE]);
+
+	ns->data = cpu_to_be32(data32);
+	ns->data_wide = cpu_to_be64(data64);
+
+	err = rhashtable_lookup_insert_fast(&nsdata->namespaces, &ns->head,
+					    rht_ns_params);
+	if (err)
+		kfree(ns);
+
+out_unlock:
+	mutex_unlock(&nsdata->lock);
+	return err;
+}
+
+static int ioam6_genl_delns(struct sk_buff *skb, struct genl_info *info)
+{
+	struct ioam6_pernet_data *nsdata;
+	struct ioam6_namespace *ns;
+	struct ioam6_schema *sc;
+	__be16 id;
+	int err;
+
+	if (!info->attrs[IOAM6_ATTR_NS_ID])
+		return -EINVAL;
+
+	id = cpu_to_be16(nla_get_u16(info->attrs[IOAM6_ATTR_NS_ID]));
+	nsdata = ioam6_pernet(genl_info_net(info));
+
+	mutex_lock(&nsdata->lock);
+
+	ns = rhashtable_lookup_fast(&nsdata->namespaces, &id, rht_ns_params);
+	if (!ns) {
+		err = -ENOENT;
+		goto out_unlock;
+	}
+
+	sc = rcu_dereference_protected(ns->schema,
+				       lockdep_is_held(&nsdata->lock));
+
+	err = rhashtable_remove_fast(&nsdata->namespaces, &ns->head,
+				     rht_ns_params);
+	if (err)
+		goto out_unlock;
+
+	if (sc)
+		rcu_assign_pointer(sc->ns, NULL);
+
+	ioam6_ns_release(ns);
+
+out_unlock:
+	mutex_unlock(&nsdata->lock);
+	return err;
+}
+
+static int __ioam6_genl_dumpns_element(struct ioam6_namespace *ns,
+				       u32 portid,
+				       u32 seq,
+				       u32 flags,
+				       struct sk_buff *skb,
+				       u8 cmd)
+{
+	struct ioam6_schema *sc;
+	u64 data64;
+	u32 data32;
+	void *hdr;
+
+	hdr = genlmsg_put(skb, portid, seq, &ioam6_genl_family, flags, cmd);
+	if (!hdr)
+		return -ENOMEM;
+
+	data32 = be32_to_cpu(ns->data);
+	data64 = be64_to_cpu(ns->data_wide);
+
+	if (nla_put_u16(skb, IOAM6_ATTR_NS_ID, be16_to_cpu(ns->id)) ||
+	    (data32 != IOAM6_U32_UNAVAILABLE &&
+	     nla_put_u32(skb, IOAM6_ATTR_NS_DATA, data32)) ||
+	    (data64 != IOAM6_U64_UNAVAILABLE &&
+	     nla_put_u64_64bit(skb, IOAM6_ATTR_NS_DATA_WIDE,
+			       data64, IOAM6_ATTR_PAD)))
+		goto nla_put_failure;
+
+	rcu_read_lock();
+
+	sc = rcu_dereference(ns->schema);
+	if (sc && nla_put_u32(skb, IOAM6_ATTR_SC_ID, sc->id)) {
+		rcu_read_unlock();
+		goto nla_put_failure;
+	}
+
+	rcu_read_unlock();
+
+	genlmsg_end(skb, hdr);
+	return 0;
+
+nla_put_failure:
+	genlmsg_cancel(skb, hdr);
+	return -EMSGSIZE;
+}
+
+static int ioam6_genl_dumpns_start(struct netlink_callback *cb)
+{
+	struct ioam6_pernet_data *nsdata = ioam6_pernet(sock_net(cb->skb->sk));
+	struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
+
+	if (!iter) {
+		iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+		if (!iter)
+			return -ENOMEM;
+
+		cb->args[0] = (long)iter;
+	}
+
+	rhashtable_walk_enter(&nsdata->namespaces, iter);
+
+	return 0;
+}
+
+static int ioam6_genl_dumpns_done(struct netlink_callback *cb)
+{
+	struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
+
+	rhashtable_walk_exit(iter);
+	kfree(iter);
+
+	return 0;
+}
+
+static int ioam6_genl_dumpns(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct rhashtable_iter *iter;
+	struct ioam6_namespace *ns;
+	int err;
+
+	iter = (struct rhashtable_iter *)cb->args[0];
+	rhashtable_walk_start(iter);
+
+	for (;;) {
+		ns = rhashtable_walk_next(iter);
+
+		if (IS_ERR(ns)) {
+			if (PTR_ERR(ns) == -EAGAIN)
+				continue;
+			err = PTR_ERR(ns);
+			goto done;
+		} else if (!ns) {
+			break;
+		}
+
+		err = __ioam6_genl_dumpns_element(ns,
+						  NETLINK_CB(cb->skb).portid,
+						  cb->nlh->nlmsg_seq,
+						  NLM_F_MULTI,
+						  skb,
+						  IOAM6_CMD_DUMP_NAMESPACES);
+		if (err)
+			goto done;
+	}
+
+	err = skb->len;
+
+done:
+	rhashtable_walk_stop(iter);
+	return err;
+}
+
+static int ioam6_genl_addsc(struct sk_buff *skb, struct genl_info *info)
+{
+	struct ioam6_pernet_data *nsdata;
+	int len, len_aligned, err;
+	struct ioam6_schema *sc;
+	u32 id;
+
+	if (!info->attrs[IOAM6_ATTR_SC_ID] || !info->attrs[IOAM6_ATTR_SC_DATA])
+		return -EINVAL;
+
+	id = nla_get_u32(info->attrs[IOAM6_ATTR_SC_ID]);
+	nsdata = ioam6_pernet(genl_info_net(info));
+
+	mutex_lock(&nsdata->lock);
+
+	sc = rhashtable_lookup_fast(&nsdata->schemas, &id, rht_sc_params);
+	if (sc) {
+		err = -EEXIST;
+		goto out_unlock;
+	}
+
+	len = nla_len(info->attrs[IOAM6_ATTR_SC_DATA]);
+	len_aligned = ALIGN(len, 4);
+
+	sc = kzalloc(sizeof(*sc) + len_aligned, GFP_KERNEL);
+	if (!sc) {
+		err = -ENOMEM;
+		goto out_unlock;
+	}
+
+	sc->id = id;
+	sc->len = len_aligned;
+	sc->hdr = cpu_to_be32(sc->id | ((u8)(sc->len / 4) << 24));
+	nla_memcpy(sc->data, info->attrs[IOAM6_ATTR_SC_DATA], len);
+
+	err = rhashtable_lookup_insert_fast(&nsdata->schemas, &sc->head,
+					    rht_sc_params);
+	if (err)
+		goto free_sc;
+
+out_unlock:
+	mutex_unlock(&nsdata->lock);
+	return err;
+free_sc:
+	kfree(sc);
+	goto out_unlock;
+}
+
+static int ioam6_genl_delsc(struct sk_buff *skb, struct genl_info *info)
+{
+	struct ioam6_pernet_data *nsdata;
+	struct ioam6_namespace *ns;
+	struct ioam6_schema *sc;
+	int err;
+	u32 id;
+
+	if (!info->attrs[IOAM6_ATTR_SC_ID])
+		return -EINVAL;
+
+	id = nla_get_u32(info->attrs[IOAM6_ATTR_SC_ID]);
+	nsdata = ioam6_pernet(genl_info_net(info));
+
+	mutex_lock(&nsdata->lock);
+
+	sc = rhashtable_lookup_fast(&nsdata->schemas, &id, rht_sc_params);
+	if (!sc) {
+		err = -ENOENT;
+		goto out_unlock;
+	}
+
+	ns = rcu_dereference_protected(sc->ns, lockdep_is_held(&nsdata->lock));
+
+	err = rhashtable_remove_fast(&nsdata->schemas, &sc->head,
+				     rht_sc_params);
+	if (err)
+		goto out_unlock;
+
+	if (ns)
+		rcu_assign_pointer(ns->schema, NULL);
+
+	ioam6_sc_release(sc);
+
+out_unlock:
+	mutex_unlock(&nsdata->lock);
+	return err;
+}
+
+static int __ioam6_genl_dumpsc_element(struct ioam6_schema *sc,
+				       u32 portid, u32 seq, u32 flags,
+				       struct sk_buff *skb, u8 cmd)
+{
+	struct ioam6_namespace *ns;
+	void *hdr;
+
+	hdr = genlmsg_put(skb, portid, seq, &ioam6_genl_family, flags, cmd);
+	if (!hdr)
+		return -ENOMEM;
+
+	if (nla_put_u32(skb, IOAM6_ATTR_SC_ID, sc->id) ||
+	    nla_put(skb, IOAM6_ATTR_SC_DATA, sc->len, sc->data))
+		goto nla_put_failure;
+
+	rcu_read_lock();
+
+	ns = rcu_dereference(sc->ns);
+	if (ns && nla_put_u16(skb, IOAM6_ATTR_NS_ID, be16_to_cpu(ns->id))) {
+		rcu_read_unlock();
+		goto nla_put_failure;
+	}
+
+	rcu_read_unlock();
+
+	genlmsg_end(skb, hdr);
+	return 0;
+
+nla_put_failure:
+	genlmsg_cancel(skb, hdr);
+	return -EMSGSIZE;
+}
+
+static int ioam6_genl_dumpsc_start(struct netlink_callback *cb)
+{
+	struct ioam6_pernet_data *nsdata = ioam6_pernet(sock_net(cb->skb->sk));
+	struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
+
+	if (!iter) {
+		iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+		if (!iter)
+			return -ENOMEM;
+
+		cb->args[0] = (long)iter;
+	}
+
+	rhashtable_walk_enter(&nsdata->schemas, iter);
+
+	return 0;
+}
+
+static int ioam6_genl_dumpsc_done(struct netlink_callback *cb)
+{
+	struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
+
+	rhashtable_walk_exit(iter);
+	kfree(iter);
+
+	return 0;
+}
+
+static int ioam6_genl_dumpsc(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct rhashtable_iter *iter;
+	struct ioam6_schema *sc;
+	int err;
+
+	iter = (struct rhashtable_iter *)cb->args[0];
+	rhashtable_walk_start(iter);
+
+	for (;;) {
+		sc = rhashtable_walk_next(iter);
+
+		if (IS_ERR(sc)) {
+			if (PTR_ERR(sc) == -EAGAIN)
+				continue;
+			err = PTR_ERR(sc);
+			goto done;
+		} else if (!sc) {
+			break;
+		}
+
+		err = __ioam6_genl_dumpsc_element(sc,
+						  NETLINK_CB(cb->skb).portid,
+						  cb->nlh->nlmsg_seq,
+						  NLM_F_MULTI,
+						  skb,
+						  IOAM6_CMD_DUMP_SCHEMAS);
+		if (err)
+			goto done;
+	}
+
+	err = skb->len;
+
+done:
+	rhashtable_walk_stop(iter);
+	return err;
+}
+
+static int ioam6_genl_ns_set_schema(struct sk_buff *skb, struct genl_info *info)
+{
+	struct ioam6_namespace *ns, *ns_ref;
+	struct ioam6_schema *sc, *sc_ref;
+	struct ioam6_pernet_data *nsdata;
+	__be16 ns_id;
+	u32 sc_id;
+	int err;
+
+	if (!info->attrs[IOAM6_ATTR_NS_ID] ||
+	    (!info->attrs[IOAM6_ATTR_SC_ID] &&
+	     !info->attrs[IOAM6_ATTR_SC_NONE]))
+		return -EINVAL;
+
+	ns_id = cpu_to_be16(nla_get_u16(info->attrs[IOAM6_ATTR_NS_ID]));
+	nsdata = ioam6_pernet(genl_info_net(info));
+
+	mutex_lock(&nsdata->lock);
+
+	ns = rhashtable_lookup_fast(&nsdata->namespaces, &ns_id, rht_ns_params);
+	if (!ns) {
+		err = -ENOENT;
+		goto out_unlock;
+	}
+
+	if (info->attrs[IOAM6_ATTR_SC_NONE]) {
+		sc = NULL;
+	} else {
+		sc_id = nla_get_u32(info->attrs[IOAM6_ATTR_SC_ID]);
+		sc = rhashtable_lookup_fast(&nsdata->schemas, &sc_id,
+					    rht_sc_params);
+		if (!sc) {
+			err = -ENOENT;
+			goto out_unlock;
+		}
+	}
+
+	sc_ref = rcu_dereference_protected(ns->schema,
+					   lockdep_is_held(&nsdata->lock));
+	if (sc_ref)
+		rcu_assign_pointer(sc_ref->ns, NULL);
+	rcu_assign_pointer(ns->schema, sc);
+
+	if (sc) {
+		ns_ref = rcu_dereference_protected(sc->ns,
+						   lockdep_is_held(&nsdata->lock));
+		if (ns_ref)
+			rcu_assign_pointer(ns_ref->schema, NULL);
+		rcu_assign_pointer(sc->ns, ns);
+	}
+
+	err = 0;
+
+out_unlock:
+	mutex_unlock(&nsdata->lock);
+	return err;
+}
+
+static const struct genl_ops ioam6_genl_ops[] = {
+	{
+		.cmd	= IOAM6_CMD_ADD_NAMESPACE,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.doit	= ioam6_genl_addns,
+		.flags	= GENL_ADMIN_PERM,
+		.policy	= ioam6_genl_policy_addns,
+		.maxattr = ARRAY_SIZE(ioam6_genl_policy_addns) - 1,
+	},
+	{
+		.cmd	= IOAM6_CMD_DEL_NAMESPACE,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.doit	= ioam6_genl_delns,
+		.flags	= GENL_ADMIN_PERM,
+		.policy	= ioam6_genl_policy_delns,
+		.maxattr = ARRAY_SIZE(ioam6_genl_policy_delns) - 1,
+	},
+	{
+		.cmd	= IOAM6_CMD_DUMP_NAMESPACES,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.start	= ioam6_genl_dumpns_start,
+		.dumpit	= ioam6_genl_dumpns,
+		.done	= ioam6_genl_dumpns_done,
+		.flags	= GENL_ADMIN_PERM,
+	},
+	{
+		.cmd	= IOAM6_CMD_ADD_SCHEMA,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.doit	= ioam6_genl_addsc,
+		.flags	= GENL_ADMIN_PERM,
+		.policy	= ioam6_genl_policy_addsc,
+		.maxattr = ARRAY_SIZE(ioam6_genl_policy_addsc) - 1,
+	},
+	{
+		.cmd	= IOAM6_CMD_DEL_SCHEMA,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.doit	= ioam6_genl_delsc,
+		.flags	= GENL_ADMIN_PERM,
+		.policy	= ioam6_genl_policy_delsc,
+		.maxattr = ARRAY_SIZE(ioam6_genl_policy_delsc) - 1,
+	},
+	{
+		.cmd	= IOAM6_CMD_DUMP_SCHEMAS,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.start	= ioam6_genl_dumpsc_start,
+		.dumpit	= ioam6_genl_dumpsc,
+		.done	= ioam6_genl_dumpsc_done,
+		.flags	= GENL_ADMIN_PERM,
+	},
+	{
+		.cmd	= IOAM6_CMD_NS_SET_SCHEMA,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.doit	= ioam6_genl_ns_set_schema,
+		.flags	= GENL_ADMIN_PERM,
+		.policy	= ioam6_genl_policy_ns_sc,
+		.maxattr = ARRAY_SIZE(ioam6_genl_policy_ns_sc) - 1,
+	},
+};
+
+static struct genl_family ioam6_genl_family __ro_after_init = {
+	.name		= IOAM6_GENL_NAME,
+	.version	= IOAM6_GENL_VERSION,
+	.netnsok	= true,
+	.parallel_ops	= true,
+	.ops		= ioam6_genl_ops,
+	.n_ops		= ARRAY_SIZE(ioam6_genl_ops),
+	.resv_start_op	= IOAM6_CMD_NS_SET_SCHEMA + 1,
+	.module		= THIS_MODULE,
+};
+
+struct ioam6_namespace *ioam6_namespace(struct net *net, __be16 id)
+{
+	struct ioam6_pernet_data *nsdata = ioam6_pernet(net);
+
+	return rhashtable_lookup_fast(&nsdata->namespaces, &id, rht_ns_params);
+}
+
+static void __ioam6_fill_trace_data(struct sk_buff *skb,
+				    struct ioam6_namespace *ns,
+				    struct ioam6_trace_hdr *trace,
+				    struct ioam6_schema *sc,
+				    u8 sclen, bool is_input)
+{
+	struct timespec64 ts;
+	ktime_t tstamp;
+	u64 raw64;
+	u32 raw32;
+	u16 raw16;
+	u8 *data;
+	u8 byte;
+
+	data = trace->data + trace->remlen * 4 - trace->nodelen * 4 - sclen * 4;
+
+	/* hop_lim and node_id */
+	if (trace->type.bit0) {
+		byte = ipv6_hdr(skb)->hop_limit;
+		if (is_input)
+			byte--;
+
+		raw32 = dev_net(skb_dst(skb)->dev)->ipv6.sysctl.ioam6_id;
+
+		*(__be32 *)data = cpu_to_be32((byte << 24) | raw32);
+		data += sizeof(__be32);
+	}
+
+	/* ingress_if_id and egress_if_id */
+	if (trace->type.bit1) {
+		if (!skb->dev)
+			raw16 = IOAM6_U16_UNAVAILABLE;
+		else
+			raw16 = (__force u16)__in6_dev_get(skb->dev)->cnf.ioam6_id;
+
+		*(__be16 *)data = cpu_to_be16(raw16);
+		data += sizeof(__be16);
+
+		if (skb_dst(skb)->dev->flags & IFF_LOOPBACK)
+			raw16 = IOAM6_U16_UNAVAILABLE;
+		else
+			raw16 = (__force u16)__in6_dev_get(skb_dst(skb)->dev)->cnf.ioam6_id;
+
+		*(__be16 *)data = cpu_to_be16(raw16);
+		data += sizeof(__be16);
+	}
+
+	/* timestamp seconds */
+	if (trace->type.bit2) {
+		if (!skb->dev) {
+			*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
+		} else {
+			tstamp = skb_tstamp_cond(skb, true);
+			ts = ktime_to_timespec64(tstamp);
+
+			*(__be32 *)data = cpu_to_be32((u32)ts.tv_sec);
+		}
+		data += sizeof(__be32);
+	}
+
+	/* timestamp subseconds */
+	if (trace->type.bit3) {
+		if (!skb->dev) {
+			*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
+		} else {
+			if (!trace->type.bit2) {
+				tstamp = skb_tstamp_cond(skb, true);
+				ts = ktime_to_timespec64(tstamp);
+			}
+
+			*(__be32 *)data = cpu_to_be32((u32)(ts.tv_nsec / NSEC_PER_USEC));
+		}
+		data += sizeof(__be32);
+	}
+
+	/* transit delay */
+	if (trace->type.bit4) {
+		*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
+		data += sizeof(__be32);
+	}
+
+	/* namespace data */
+	if (trace->type.bit5) {
+		*(__be32 *)data = ns->data;
+		data += sizeof(__be32);
+	}
+
+	/* queue depth */
+	if (trace->type.bit6) {
+		struct netdev_queue *queue;
+		struct Qdisc *qdisc;
+		__u32 qlen, backlog;
+
+		if (skb_dst(skb)->dev->flags & IFF_LOOPBACK) {
+			*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
+		} else {
+			queue = skb_get_tx_queue(skb_dst(skb)->dev, skb);
+			qdisc = rcu_dereference(queue->qdisc);
+			qdisc_qstats_qlen_backlog(qdisc, &qlen, &backlog);
+
+			*(__be32 *)data = cpu_to_be32(backlog);
+		}
+		data += sizeof(__be32);
+	}
+
+	/* checksum complement */
+	if (trace->type.bit7) {
+		*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
+		data += sizeof(__be32);
+	}
+
+	/* hop_lim and node_id (wide) */
+	if (trace->type.bit8) {
+		byte = ipv6_hdr(skb)->hop_limit;
+		if (is_input)
+			byte--;
+
+		raw64 = dev_net(skb_dst(skb)->dev)->ipv6.sysctl.ioam6_id_wide;
+
+		*(__be64 *)data = cpu_to_be64(((u64)byte << 56) | raw64);
+		data += sizeof(__be64);
+	}
+
+	/* ingress_if_id and egress_if_id (wide) */
+	if (trace->type.bit9) {
+		if (!skb->dev)
+			raw32 = IOAM6_U32_UNAVAILABLE;
+		else
+			raw32 = __in6_dev_get(skb->dev)->cnf.ioam6_id_wide;
+
+		*(__be32 *)data = cpu_to_be32(raw32);
+		data += sizeof(__be32);
+
+		if (skb_dst(skb)->dev->flags & IFF_LOOPBACK)
+			raw32 = IOAM6_U32_UNAVAILABLE;
+		else
+			raw32 = __in6_dev_get(skb_dst(skb)->dev)->cnf.ioam6_id_wide;
+
+		*(__be32 *)data = cpu_to_be32(raw32);
+		data += sizeof(__be32);
+	}
+
+	/* namespace data (wide) */
+	if (trace->type.bit10) {
+		*(__be64 *)data = ns->data_wide;
+		data += sizeof(__be64);
+	}
+
+	/* buffer occupancy */
+	if (trace->type.bit11) {
+		*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
+		data += sizeof(__be32);
+	}
+
+	/* bit12 undefined: filled with empty value */
+	if (trace->type.bit12) {
+		*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
+		data += sizeof(__be32);
+	}
+
+	/* bit13 undefined: filled with empty value */
+	if (trace->type.bit13) {
+		*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
+		data += sizeof(__be32);
+	}
+
+	/* bit14 undefined: filled with empty value */
+	if (trace->type.bit14) {
+		*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
+		data += sizeof(__be32);
+	}
+
+	/* bit15 undefined: filled with empty value */
+	if (trace->type.bit15) {
+		*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
+		data += sizeof(__be32);
+	}
+
+	/* bit16 undefined: filled with empty value */
+	if (trace->type.bit16) {
+		*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
+		data += sizeof(__be32);
+	}
+
+	/* bit17 undefined: filled with empty value */
+	if (trace->type.bit17) {
+		*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
+		data += sizeof(__be32);
+	}
+
+	/* bit18 undefined: filled with empty value */
+	if (trace->type.bit18) {
+		*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
+		data += sizeof(__be32);
+	}
+
+	/* bit19 undefined: filled with empty value */
+	if (trace->type.bit19) {
+		*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
+		data += sizeof(__be32);
+	}
+
+	/* bit20 undefined: filled with empty value */
+	if (trace->type.bit20) {
+		*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
+		data += sizeof(__be32);
+	}
+
+	/* bit21 undefined: filled with empty value */
+	if (trace->type.bit21) {
+		*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE);
+		data += sizeof(__be32);
+	}
+
+	/* opaque state snapshot */
+	if (trace->type.bit22) {
+		if (!sc) {
+			*(__be32 *)data = cpu_to_be32(IOAM6_U32_UNAVAILABLE >> 8);
+		} else {
+			*(__be32 *)data = sc->hdr;
+			data += sizeof(__be32);
+
+			memcpy(data, sc->data, sc->len);
+		}
+	}
+}
+
+/* called with rcu_read_lock() */
+void ioam6_fill_trace_data(struct sk_buff *skb,
+			   struct ioam6_namespace *ns,
+			   struct ioam6_trace_hdr *trace,
+			   bool is_input)
+{
+	struct ioam6_schema *sc;
+	u8 sclen = 0;
+
+	/* Skip if Overflow flag is set
+	 */
+	if (trace->overflow)
+		return;
+
+	/* NodeLen does not include Opaque State Snapshot length. We need to
+	 * take it into account if the corresponding bit is set (bit 22) and
+	 * if the current IOAM namespace has an active schema attached to it
+	 */
+	sc = rcu_dereference(ns->schema);
+	if (trace->type.bit22) {
+		sclen = sizeof_field(struct ioam6_schema, hdr) / 4;
+
+		if (sc)
+			sclen += sc->len / 4;
+	}
+
+	/* If there is no space remaining, we set the Overflow flag and we
+	 * skip without filling the trace
+	 */
+	if (!trace->remlen || trace->remlen < trace->nodelen + sclen) {
+		trace->overflow = 1;
+		return;
+	}
+
+	__ioam6_fill_trace_data(skb, ns, trace, sc, sclen, is_input);
+	trace->remlen -= trace->nodelen + sclen;
+}
+
+static int __net_init ioam6_net_init(struct net *net)
+{
+	struct ioam6_pernet_data *nsdata;
+	int err = -ENOMEM;
+
+	nsdata = kzalloc(sizeof(*nsdata), GFP_KERNEL);
+	if (!nsdata)
+		goto out;
+
+	mutex_init(&nsdata->lock);
+	net->ipv6.ioam6_data = nsdata;
+
+	err = rhashtable_init(&nsdata->namespaces, &rht_ns_params);
+	if (err)
+		goto free_nsdata;
+
+	err = rhashtable_init(&nsdata->schemas, &rht_sc_params);
+	if (err)
+		goto free_rht_ns;
+
+out:
+	return err;
+free_rht_ns:
+	rhashtable_destroy(&nsdata->namespaces);
+free_nsdata:
+	kfree(nsdata);
+	net->ipv6.ioam6_data = NULL;
+	goto out;
+}
+
+static void __net_exit ioam6_net_exit(struct net *net)
+{
+	struct ioam6_pernet_data *nsdata = ioam6_pernet(net);
+
+	rhashtable_free_and_destroy(&nsdata->namespaces, ioam6_free_ns, NULL);
+	rhashtable_free_and_destroy(&nsdata->schemas, ioam6_free_sc, NULL);
+
+	kfree(nsdata);
+}
+
+static struct pernet_operations ioam6_net_ops = {
+	.init = ioam6_net_init,
+	.exit = ioam6_net_exit,
+};
+
+int __init ioam6_init(void)
+{
+	int err = register_pernet_subsys(&ioam6_net_ops);
+	if (err)
+		goto out;
+
+	err = genl_register_family(&ioam6_genl_family);
+	if (err)
+		goto out_unregister_pernet_subsys;
+
+#ifdef CONFIG_IPV6_IOAM6_LWTUNNEL
+	err = ioam6_iptunnel_init();
+	if (err)
+		goto out_unregister_genl;
+#endif
+
+	pr_info("In-situ OAM (IOAM) with IPv6\n");
+
+out:
+	return err;
+#ifdef CONFIG_IPV6_IOAM6_LWTUNNEL
+out_unregister_genl:
+	genl_unregister_family(&ioam6_genl_family);
+#endif
+out_unregister_pernet_subsys:
+	unregister_pernet_subsys(&ioam6_net_ops);
+	goto out;
+}
+
+void ioam6_exit(void)
+{
+#ifdef CONFIG_IPV6_IOAM6_LWTUNNEL
+	ioam6_iptunnel_exit();
+#endif
+	genl_unregister_family(&ioam6_genl_family);
+	unregister_pernet_subsys(&ioam6_net_ops);
+}