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, 662 insertions, 0 deletions

diff --git a/drivers/net/can/dev/netlink.c b/drivers/net/can/dev/netlink.c
new file mode 100644
index 000000000..036d85ef0
--- /dev/null
+++ b/drivers/net/can/dev/netlink.c
@@ -0,0 +1,662 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2005 Marc Kleine-Budde, Pengutronix
+ * Copyright (C) 2006 Andrey Volkov, Varma Electronics
+ * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
+ * Copyright (C) 2021 Vincent Mailhol <mailhol.vincent@wanadoo.fr>
+ */
+
+#include <linux/can/dev.h>
+#include <net/rtnetlink.h>
+
+static const struct nla_policy can_policy[IFLA_CAN_MAX + 1] = {
+	[IFLA_CAN_STATE] = { .type = NLA_U32 },
+	[IFLA_CAN_CTRLMODE] = { .len = sizeof(struct can_ctrlmode) },
+	[IFLA_CAN_RESTART_MS] = { .type = NLA_U32 },
+	[IFLA_CAN_RESTART] = { .type = NLA_U32 },
+	[IFLA_CAN_BITTIMING] = { .len = sizeof(struct can_bittiming) },
+	[IFLA_CAN_BITTIMING_CONST] = { .len = sizeof(struct can_bittiming_const) },
+	[IFLA_CAN_CLOCK] = { .len = sizeof(struct can_clock) },
+	[IFLA_CAN_BERR_COUNTER] = { .len = sizeof(struct can_berr_counter) },
+	[IFLA_CAN_DATA_BITTIMING] = { .len = sizeof(struct can_bittiming) },
+	[IFLA_CAN_DATA_BITTIMING_CONST]	= { .len = sizeof(struct can_bittiming_const) },
+	[IFLA_CAN_TERMINATION] = { .type = NLA_U16 },
+	[IFLA_CAN_TDC] = { .type = NLA_NESTED },
+	[IFLA_CAN_CTRLMODE_EXT] = { .type = NLA_NESTED },
+};
+
+static const struct nla_policy can_tdc_policy[IFLA_CAN_TDC_MAX + 1] = {
+	[IFLA_CAN_TDC_TDCV_MIN] = { .type = NLA_U32 },
+	[IFLA_CAN_TDC_TDCV_MAX] = { .type = NLA_U32 },
+	[IFLA_CAN_TDC_TDCO_MIN] = { .type = NLA_U32 },
+	[IFLA_CAN_TDC_TDCO_MAX] = { .type = NLA_U32 },
+	[IFLA_CAN_TDC_TDCF_MIN] = { .type = NLA_U32 },
+	[IFLA_CAN_TDC_TDCF_MAX] = { .type = NLA_U32 },
+	[IFLA_CAN_TDC_TDCV] = { .type = NLA_U32 },
+	[IFLA_CAN_TDC_TDCO] = { .type = NLA_U32 },
+	[IFLA_CAN_TDC_TDCF] = { .type = NLA_U32 },
+};
+
+static int can_validate_bittiming(const struct can_bittiming *bt,
+				  struct netlink_ext_ack *extack)
+{
+	/* sample point is in one-tenth of a percent */
+	if (bt->sample_point >= 1000) {
+		NL_SET_ERR_MSG(extack, "sample point must be between 0 and 100%");
+
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int can_validate(struct nlattr *tb[], struct nlattr *data[],
+			struct netlink_ext_ack *extack)
+{
+	bool is_can_fd = false;
+	int err;
+
+	/* Make sure that valid CAN FD configurations always consist of
+	 * - nominal/arbitration bittiming
+	 * - data bittiming
+	 * - control mode with CAN_CTRLMODE_FD set
+	 * - TDC parameters are coherent (details below)
+	 */
+
+	if (!data)
+		return 0;
+
+	if (data[IFLA_CAN_BITTIMING]) {
+		struct can_bittiming bt;
+
+		memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt));
+		err = can_validate_bittiming(&bt, extack);
+		if (err)
+			return err;
+	}
+
+	if (data[IFLA_CAN_CTRLMODE]) {
+		struct can_ctrlmode *cm = nla_data(data[IFLA_CAN_CTRLMODE]);
+		u32 tdc_flags = cm->flags & CAN_CTRLMODE_TDC_MASK;
+
+		is_can_fd = cm->flags & cm->mask & CAN_CTRLMODE_FD;
+
+		/* CAN_CTRLMODE_TDC_{AUTO,MANUAL} are mutually exclusive */
+		if (tdc_flags == CAN_CTRLMODE_TDC_MASK)
+			return -EOPNOTSUPP;
+		/* If one of the CAN_CTRLMODE_TDC_* flag is set then
+		 * TDC must be set and vice-versa
+		 */
+		if (!!tdc_flags != !!data[IFLA_CAN_TDC])
+			return -EOPNOTSUPP;
+		/* If providing TDC parameters, at least TDCO is
+		 * needed. TDCV is needed if and only if
+		 * CAN_CTRLMODE_TDC_MANUAL is set
+		 */
+		if (data[IFLA_CAN_TDC]) {
+			struct nlattr *tb_tdc[IFLA_CAN_TDC_MAX + 1];
+
+			err = nla_parse_nested(tb_tdc, IFLA_CAN_TDC_MAX,
+					       data[IFLA_CAN_TDC],
+					       can_tdc_policy, extack);
+			if (err)
+				return err;
+
+			if (tb_tdc[IFLA_CAN_TDC_TDCV]) {
+				if (tdc_flags & CAN_CTRLMODE_TDC_AUTO)
+					return -EOPNOTSUPP;
+			} else {
+				if (tdc_flags & CAN_CTRLMODE_TDC_MANUAL)
+					return -EOPNOTSUPP;
+			}
+
+			if (!tb_tdc[IFLA_CAN_TDC_TDCO])
+				return -EOPNOTSUPP;
+		}
+	}
+
+	if (is_can_fd) {
+		if (!data[IFLA_CAN_BITTIMING] || !data[IFLA_CAN_DATA_BITTIMING])
+			return -EOPNOTSUPP;
+	}
+
+	if (data[IFLA_CAN_DATA_BITTIMING] || data[IFLA_CAN_TDC]) {
+		if (!is_can_fd)
+			return -EOPNOTSUPP;
+	}
+
+	if (data[IFLA_CAN_DATA_BITTIMING]) {
+		struct can_bittiming bt;
+
+		memcpy(&bt, nla_data(data[IFLA_CAN_DATA_BITTIMING]), sizeof(bt));
+		err = can_validate_bittiming(&bt, extack);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int can_tdc_changelink(struct can_priv *priv, const struct nlattr *nla,
+			      struct netlink_ext_ack *extack)
+{
+	struct nlattr *tb_tdc[IFLA_CAN_TDC_MAX + 1];
+	struct can_tdc tdc = { 0 };
+	const struct can_tdc_const *tdc_const = priv->tdc_const;
+	int err;
+
+	if (!tdc_const || !can_tdc_is_enabled(priv))
+		return -EOPNOTSUPP;
+
+	err = nla_parse_nested(tb_tdc, IFLA_CAN_TDC_MAX, nla,
+			       can_tdc_policy, extack);
+	if (err)
+		return err;
+
+	if (tb_tdc[IFLA_CAN_TDC_TDCV]) {
+		u32 tdcv = nla_get_u32(tb_tdc[IFLA_CAN_TDC_TDCV]);
+
+		if (tdcv < tdc_const->tdcv_min || tdcv > tdc_const->tdcv_max)
+			return -EINVAL;
+
+		tdc.tdcv = tdcv;
+	}
+
+	if (tb_tdc[IFLA_CAN_TDC_TDCO]) {
+		u32 tdco = nla_get_u32(tb_tdc[IFLA_CAN_TDC_TDCO]);
+
+		if (tdco < tdc_const->tdco_min || tdco > tdc_const->tdco_max)
+			return -EINVAL;
+
+		tdc.tdco = tdco;
+	}
+
+	if (tb_tdc[IFLA_CAN_TDC_TDCF]) {
+		u32 tdcf = nla_get_u32(tb_tdc[IFLA_CAN_TDC_TDCF]);
+
+		if (tdcf < tdc_const->tdcf_min || tdcf > tdc_const->tdcf_max)
+			return -EINVAL;
+
+		tdc.tdcf = tdcf;
+	}
+
+	priv->tdc = tdc;
+
+	return 0;
+}
+
+static int can_changelink(struct net_device *dev, struct nlattr *tb[],
+			  struct nlattr *data[],
+			  struct netlink_ext_ack *extack)
+{
+	struct can_priv *priv = netdev_priv(dev);
+	u32 tdc_mask = 0;
+	int err;
+
+	/* We need synchronization with dev->stop() */
+	ASSERT_RTNL();
+
+	if (data[IFLA_CAN_BITTIMING]) {
+		struct can_bittiming bt;
+
+		/* Do not allow changing bittiming while running */
+		if (dev->flags & IFF_UP)
+			return -EBUSY;
+
+		/* Calculate bittiming parameters based on
+		 * bittiming_const if set, otherwise pass bitrate
+		 * directly via do_set_bitrate(). Bail out if neither
+		 * is given.
+		 */
+		if (!priv->bittiming_const && !priv->do_set_bittiming &&
+		    !priv->bitrate_const)
+			return -EOPNOTSUPP;
+
+		memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt));
+		err = can_get_bittiming(dev, &bt,
+					priv->bittiming_const,
+					priv->bitrate_const,
+					priv->bitrate_const_cnt,
+					extack);
+		if (err)
+			return err;
+
+		if (priv->bitrate_max && bt.bitrate > priv->bitrate_max) {
+			NL_SET_ERR_MSG_FMT(extack,
+					   "arbitration bitrate %u bps surpasses transceiver capabilities of %u bps",
+					   bt.bitrate, priv->bitrate_max);
+			return -EINVAL;
+		}
+
+		memcpy(&priv->bittiming, &bt, sizeof(bt));
+
+		if (priv->do_set_bittiming) {
+			/* Finally, set the bit-timing registers */
+			err = priv->do_set_bittiming(dev);
+			if (err)
+				return err;
+		}
+	}
+
+	if (data[IFLA_CAN_CTRLMODE]) {
+		struct can_ctrlmode *cm;
+		u32 ctrlstatic;
+		u32 maskedflags;
+
+		/* Do not allow changing controller mode while running */
+		if (dev->flags & IFF_UP)
+			return -EBUSY;
+		cm = nla_data(data[IFLA_CAN_CTRLMODE]);
+		ctrlstatic = can_get_static_ctrlmode(priv);
+		maskedflags = cm->flags & cm->mask;
+
+		/* check whether provided bits are allowed to be passed */
+		if (maskedflags & ~(priv->ctrlmode_supported | ctrlstatic))
+			return -EOPNOTSUPP;
+
+		/* do not check for static fd-non-iso if 'fd' is disabled */
+		if (!(maskedflags & CAN_CTRLMODE_FD))
+			ctrlstatic &= ~CAN_CTRLMODE_FD_NON_ISO;
+
+		/* make sure static options are provided by configuration */
+		if ((maskedflags & ctrlstatic) != ctrlstatic)
+			return -EOPNOTSUPP;
+
+		/* clear bits to be modified and copy the flag values */
+		priv->ctrlmode &= ~cm->mask;
+		priv->ctrlmode |= maskedflags;
+
+		/* CAN_CTRLMODE_FD can only be set when driver supports FD */
+		if (priv->ctrlmode & CAN_CTRLMODE_FD) {
+			dev->mtu = CANFD_MTU;
+		} else {
+			dev->mtu = CAN_MTU;
+			memset(&priv->data_bittiming, 0,
+			       sizeof(priv->data_bittiming));
+			priv->ctrlmode &= ~CAN_CTRLMODE_TDC_MASK;
+			memset(&priv->tdc, 0, sizeof(priv->tdc));
+		}
+
+		tdc_mask = cm->mask & CAN_CTRLMODE_TDC_MASK;
+		/* CAN_CTRLMODE_TDC_{AUTO,MANUAL} are mutually
+		 * exclusive: make sure to turn the other one off
+		 */
+		if (tdc_mask)
+			priv->ctrlmode &= cm->flags | ~CAN_CTRLMODE_TDC_MASK;
+	}
+
+	if (data[IFLA_CAN_RESTART_MS]) {
+		/* Do not allow changing restart delay while running */
+		if (dev->flags & IFF_UP)
+			return -EBUSY;
+		priv->restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]);
+	}
+
+	if (data[IFLA_CAN_RESTART]) {
+		/* Do not allow a restart while not running */
+		if (!(dev->flags & IFF_UP))
+			return -EINVAL;
+		err = can_restart_now(dev);
+		if (err)
+			return err;
+	}
+
+	if (data[IFLA_CAN_DATA_BITTIMING]) {
+		struct can_bittiming dbt;
+
+		/* Do not allow changing bittiming while running */
+		if (dev->flags & IFF_UP)
+			return -EBUSY;
+
+		/* Calculate bittiming parameters based on
+		 * data_bittiming_const if set, otherwise pass bitrate
+		 * directly via do_set_bitrate(). Bail out if neither
+		 * is given.
+		 */
+		if (!priv->data_bittiming_const && !priv->do_set_data_bittiming &&
+		    !priv->data_bitrate_const)
+			return -EOPNOTSUPP;
+
+		memcpy(&dbt, nla_data(data[IFLA_CAN_DATA_BITTIMING]),
+		       sizeof(dbt));
+		err = can_get_bittiming(dev, &dbt,
+					priv->data_bittiming_const,
+					priv->data_bitrate_const,
+					priv->data_bitrate_const_cnt,
+					extack);
+		if (err)
+			return err;
+
+		if (priv->bitrate_max && dbt.bitrate > priv->bitrate_max) {
+			NL_SET_ERR_MSG_FMT(extack,
+					   "CANFD data bitrate %u bps surpasses transceiver capabilities of %u bps",
+					   dbt.bitrate, priv->bitrate_max);
+			return -EINVAL;
+		}
+
+		memset(&priv->tdc, 0, sizeof(priv->tdc));
+		if (data[IFLA_CAN_TDC]) {
+			/* TDC parameters are provided: use them */
+			err = can_tdc_changelink(priv, data[IFLA_CAN_TDC],
+						 extack);
+			if (err) {
+				priv->ctrlmode &= ~CAN_CTRLMODE_TDC_MASK;
+				return err;
+			}
+		} else if (!tdc_mask) {
+			/* Neither of TDC parameters nor TDC flags are
+			 * provided: do calculation
+			 */
+			can_calc_tdco(&priv->tdc, priv->tdc_const, &priv->data_bittiming,
+				      &priv->ctrlmode, priv->ctrlmode_supported);
+		} /* else: both CAN_CTRLMODE_TDC_{AUTO,MANUAL} are explicitly
+		   * turned off. TDC is disabled: do nothing
+		   */
+
+		memcpy(&priv->data_bittiming, &dbt, sizeof(dbt));
+
+		if (priv->do_set_data_bittiming) {
+			/* Finally, set the bit-timing registers */
+			err = priv->do_set_data_bittiming(dev);
+			if (err)
+				return err;
+		}
+	}
+
+	if (data[IFLA_CAN_TERMINATION]) {
+		const u16 termval = nla_get_u16(data[IFLA_CAN_TERMINATION]);
+		const unsigned int num_term = priv->termination_const_cnt;
+		unsigned int i;
+
+		if (!priv->do_set_termination)
+			return -EOPNOTSUPP;
+
+		/* check whether given value is supported by the interface */
+		for (i = 0; i < num_term; i++) {
+			if (termval == priv->termination_const[i])
+				break;
+		}
+		if (i >= num_term)
+			return -EINVAL;
+
+		/* Finally, set the termination value */
+		err = priv->do_set_termination(dev, termval);
+		if (err)
+			return err;
+
+		priv->termination = termval;
+	}
+
+	return 0;
+}
+
+static size_t can_tdc_get_size(const struct net_device *dev)
+{
+	struct can_priv *priv = netdev_priv(dev);
+	size_t size;
+
+	if (!priv->tdc_const)
+		return 0;
+
+	size = nla_total_size(0);			/* nest IFLA_CAN_TDC */
+	if (priv->ctrlmode_supported & CAN_CTRLMODE_TDC_MANUAL) {
+		size += nla_total_size(sizeof(u32));	/* IFLA_CAN_TDCV_MIN */
+		size += nla_total_size(sizeof(u32));	/* IFLA_CAN_TDCV_MAX */
+	}
+	size += nla_total_size(sizeof(u32));		/* IFLA_CAN_TDCO_MIN */
+	size += nla_total_size(sizeof(u32));		/* IFLA_CAN_TDCO_MAX */
+	if (priv->tdc_const->tdcf_max) {
+		size += nla_total_size(sizeof(u32));	/* IFLA_CAN_TDCF_MIN */
+		size += nla_total_size(sizeof(u32));	/* IFLA_CAN_TDCF_MAX */
+	}
+
+	if (can_tdc_is_enabled(priv)) {
+		if (priv->ctrlmode & CAN_CTRLMODE_TDC_MANUAL ||
+		    priv->do_get_auto_tdcv)
+			size += nla_total_size(sizeof(u32));	/* IFLA_CAN_TDCV */
+		size += nla_total_size(sizeof(u32));		/* IFLA_CAN_TDCO */
+		if (priv->tdc_const->tdcf_max)
+			size += nla_total_size(sizeof(u32));	/* IFLA_CAN_TDCF */
+	}
+
+	return size;
+}
+
+static size_t can_ctrlmode_ext_get_size(void)
+{
+	return nla_total_size(0) +		/* nest IFLA_CAN_CTRLMODE_EXT */
+		nla_total_size(sizeof(u32));	/* IFLA_CAN_CTRLMODE_SUPPORTED */
+}
+
+static size_t can_get_size(const struct net_device *dev)
+{
+	struct can_priv *priv = netdev_priv(dev);
+	size_t size = 0;
+
+	if (priv->bittiming.bitrate)				/* IFLA_CAN_BITTIMING */
+		size += nla_total_size(sizeof(struct can_bittiming));
+	if (priv->bittiming_const)				/* IFLA_CAN_BITTIMING_CONST */
+		size += nla_total_size(sizeof(struct can_bittiming_const));
+	size += nla_total_size(sizeof(struct can_clock));	/* IFLA_CAN_CLOCK */
+	size += nla_total_size(sizeof(u32));			/* IFLA_CAN_STATE */
+	size += nla_total_size(sizeof(struct can_ctrlmode));	/* IFLA_CAN_CTRLMODE */
+	size += nla_total_size(sizeof(u32));			/* IFLA_CAN_RESTART_MS */
+	if (priv->do_get_berr_counter)				/* IFLA_CAN_BERR_COUNTER */
+		size += nla_total_size(sizeof(struct can_berr_counter));
+	if (priv->data_bittiming.bitrate)			/* IFLA_CAN_DATA_BITTIMING */
+		size += nla_total_size(sizeof(struct can_bittiming));
+	if (priv->data_bittiming_const)				/* IFLA_CAN_DATA_BITTIMING_CONST */
+		size += nla_total_size(sizeof(struct can_bittiming_const));
+	if (priv->termination_const) {
+		size += nla_total_size(sizeof(priv->termination));		/* IFLA_CAN_TERMINATION */
+		size += nla_total_size(sizeof(*priv->termination_const) *	/* IFLA_CAN_TERMINATION_CONST */
+				       priv->termination_const_cnt);
+	}
+	if (priv->bitrate_const)				/* IFLA_CAN_BITRATE_CONST */
+		size += nla_total_size(sizeof(*priv->bitrate_const) *
+				       priv->bitrate_const_cnt);
+	if (priv->data_bitrate_const)				/* IFLA_CAN_DATA_BITRATE_CONST */
+		size += nla_total_size(sizeof(*priv->data_bitrate_const) *
+				       priv->data_bitrate_const_cnt);
+	size += sizeof(priv->bitrate_max);			/* IFLA_CAN_BITRATE_MAX */
+	size += can_tdc_get_size(dev);				/* IFLA_CAN_TDC */
+	size += can_ctrlmode_ext_get_size();			/* IFLA_CAN_CTRLMODE_EXT */
+
+	return size;
+}
+
+static int can_tdc_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+	struct nlattr *nest;
+	struct can_priv *priv = netdev_priv(dev);
+	struct can_tdc *tdc = &priv->tdc;
+	const struct can_tdc_const *tdc_const = priv->tdc_const;
+
+	if (!tdc_const)
+		return 0;
+
+	nest = nla_nest_start(skb, IFLA_CAN_TDC);
+	if (!nest)
+		return -EMSGSIZE;
+
+	if (priv->ctrlmode_supported & CAN_CTRLMODE_TDC_MANUAL &&
+	    (nla_put_u32(skb, IFLA_CAN_TDC_TDCV_MIN, tdc_const->tdcv_min) ||
+	     nla_put_u32(skb, IFLA_CAN_TDC_TDCV_MAX, tdc_const->tdcv_max)))
+		goto err_cancel;
+	if (nla_put_u32(skb, IFLA_CAN_TDC_TDCO_MIN, tdc_const->tdco_min) ||
+	    nla_put_u32(skb, IFLA_CAN_TDC_TDCO_MAX, tdc_const->tdco_max))
+		goto err_cancel;
+	if (tdc_const->tdcf_max &&
+	    (nla_put_u32(skb, IFLA_CAN_TDC_TDCF_MIN, tdc_const->tdcf_min) ||
+	     nla_put_u32(skb, IFLA_CAN_TDC_TDCF_MAX, tdc_const->tdcf_max)))
+		goto err_cancel;
+
+	if (can_tdc_is_enabled(priv)) {
+		u32 tdcv;
+		int err = -EINVAL;
+
+		if (priv->ctrlmode & CAN_CTRLMODE_TDC_MANUAL) {
+			tdcv = tdc->tdcv;
+			err = 0;
+		} else if (priv->do_get_auto_tdcv) {
+			err = priv->do_get_auto_tdcv(dev, &tdcv);
+		}
+		if (!err && nla_put_u32(skb, IFLA_CAN_TDC_TDCV, tdcv))
+			goto err_cancel;
+		if (nla_put_u32(skb, IFLA_CAN_TDC_TDCO, tdc->tdco))
+			goto err_cancel;
+		if (tdc_const->tdcf_max &&
+		    nla_put_u32(skb, IFLA_CAN_TDC_TDCF, tdc->tdcf))
+			goto err_cancel;
+	}
+
+	nla_nest_end(skb, nest);
+	return 0;
+
+err_cancel:
+	nla_nest_cancel(skb, nest);
+	return -EMSGSIZE;
+}
+
+static int can_ctrlmode_ext_fill_info(struct sk_buff *skb,
+				      const struct can_priv *priv)
+{
+	struct nlattr *nest;
+
+	nest = nla_nest_start(skb, IFLA_CAN_CTRLMODE_EXT);
+	if (!nest)
+		return -EMSGSIZE;
+
+	if (nla_put_u32(skb, IFLA_CAN_CTRLMODE_SUPPORTED,
+			priv->ctrlmode_supported)) {
+		nla_nest_cancel(skb, nest);
+		return -EMSGSIZE;
+	}
+
+	nla_nest_end(skb, nest);
+	return 0;
+}
+
+static int can_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+	struct can_priv *priv = netdev_priv(dev);
+	struct can_ctrlmode cm = {.flags = priv->ctrlmode};
+	struct can_berr_counter bec = { };
+	enum can_state state = priv->state;
+
+	if (priv->do_get_state)
+		priv->do_get_state(dev, &state);
+
+	if ((priv->bittiming.bitrate != CAN_BITRATE_UNSET &&
+	     priv->bittiming.bitrate != CAN_BITRATE_UNKNOWN &&
+	     nla_put(skb, IFLA_CAN_BITTIMING,
+		     sizeof(priv->bittiming), &priv->bittiming)) ||
+
+	    (priv->bittiming_const &&
+	     nla_put(skb, IFLA_CAN_BITTIMING_CONST,
+		     sizeof(*priv->bittiming_const), priv->bittiming_const)) ||
+
+	    nla_put(skb, IFLA_CAN_CLOCK, sizeof(priv->clock), &priv->clock) ||
+	    nla_put_u32(skb, IFLA_CAN_STATE, state) ||
+	    nla_put(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm) ||
+	    nla_put_u32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms) ||
+
+	    (priv->do_get_berr_counter &&
+	     !priv->do_get_berr_counter(dev, &bec) &&
+	     nla_put(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec)) ||
+
+	    (priv->data_bittiming.bitrate &&
+	     nla_put(skb, IFLA_CAN_DATA_BITTIMING,
+		     sizeof(priv->data_bittiming), &priv->data_bittiming)) ||
+
+	    (priv->data_bittiming_const &&
+	     nla_put(skb, IFLA_CAN_DATA_BITTIMING_CONST,
+		     sizeof(*priv->data_bittiming_const),
+		     priv->data_bittiming_const)) ||
+
+	    (priv->termination_const &&
+	     (nla_put_u16(skb, IFLA_CAN_TERMINATION, priv->termination) ||
+	      nla_put(skb, IFLA_CAN_TERMINATION_CONST,
+		      sizeof(*priv->termination_const) *
+		      priv->termination_const_cnt,
+		      priv->termination_const))) ||
+
+	    (priv->bitrate_const &&
+	     nla_put(skb, IFLA_CAN_BITRATE_CONST,
+		     sizeof(*priv->bitrate_const) *
+		     priv->bitrate_const_cnt,
+		     priv->bitrate_const)) ||
+
+	    (priv->data_bitrate_const &&
+	     nla_put(skb, IFLA_CAN_DATA_BITRATE_CONST,
+		     sizeof(*priv->data_bitrate_const) *
+		     priv->data_bitrate_const_cnt,
+		     priv->data_bitrate_const)) ||
+
+	    (nla_put(skb, IFLA_CAN_BITRATE_MAX,
+		     sizeof(priv->bitrate_max),
+		     &priv->bitrate_max)) ||
+
+	    can_tdc_fill_info(skb, dev) ||
+
+	    can_ctrlmode_ext_fill_info(skb, priv)
+	    )
+
+		return -EMSGSIZE;
+
+	return 0;
+}
+
+static size_t can_get_xstats_size(const struct net_device *dev)
+{
+	return sizeof(struct can_device_stats);
+}
+
+static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev)
+{
+	struct can_priv *priv = netdev_priv(dev);
+
+	if (nla_put(skb, IFLA_INFO_XSTATS,
+		    sizeof(priv->can_stats), &priv->can_stats))
+		goto nla_put_failure;
+	return 0;
+
+nla_put_failure:
+	return -EMSGSIZE;
+}
+
+static int can_newlink(struct net *src_net, struct net_device *dev,
+		       struct nlattr *tb[], struct nlattr *data[],
+		       struct netlink_ext_ack *extack)
+{
+	return -EOPNOTSUPP;
+}
+
+static void can_dellink(struct net_device *dev, struct list_head *head)
+{
+}
+
+struct rtnl_link_ops can_link_ops __read_mostly = {
+	.kind		= "can",
+	.netns_refund	= true,
+	.maxtype	= IFLA_CAN_MAX,
+	.policy		= can_policy,
+	.setup		= can_setup,
+	.validate	= can_validate,
+	.newlink	= can_newlink,
+	.changelink	= can_changelink,
+	.dellink	= can_dellink,
+	.get_size	= can_get_size,
+	.fill_info	= can_fill_info,
+	.get_xstats_size = can_get_xstats_size,
+	.fill_xstats	= can_fill_xstats,
+};
+
+int can_netlink_register(void)
+{
+	return rtnl_link_register(&can_link_ops);
+}
+
+void can_netlink_unregister(void)
+{
+	rtnl_link_unregister(&can_link_ops);
+}