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, 395 insertions, 0 deletions

diff --git a/net/netfilter/nft_synproxy.c b/net/netfilter/nft_synproxy.c
new file mode 100644
index 000000000..13da88266
--- /dev/null
+++ b/net/netfilter/nft_synproxy.c
@@ -0,0 +1,395 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/types.h>
+#include <net/ip.h>
+#include <net/tcp.h>
+#include <net/netlink.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_synproxy.h>
+#include <net/netfilter/nf_synproxy.h>
+#include <linux/netfilter/nf_tables.h>
+#include <linux/netfilter/nf_synproxy.h>
+
+struct nft_synproxy {
+	struct nf_synproxy_info	info;
+};
+
+static const struct nla_policy nft_synproxy_policy[NFTA_SYNPROXY_MAX + 1] = {
+	[NFTA_SYNPROXY_MSS]		= { .type = NLA_U16 },
+	[NFTA_SYNPROXY_WSCALE]		= { .type = NLA_U8 },
+	[NFTA_SYNPROXY_FLAGS]		= { .type = NLA_U32 },
+};
+
+static void nft_synproxy_tcp_options(struct synproxy_options *opts,
+				     const struct tcphdr *tcp,
+				     struct synproxy_net *snet,
+				     struct nf_synproxy_info *info,
+				     const struct nft_synproxy *priv)
+{
+	this_cpu_inc(snet->stats->syn_received);
+	if (tcp->ece && tcp->cwr)
+		opts->options |= NF_SYNPROXY_OPT_ECN;
+
+	opts->options &= priv->info.options;
+	opts->mss_encode = opts->mss_option;
+	opts->mss_option = info->mss;
+	if (opts->options & NF_SYNPROXY_OPT_TIMESTAMP)
+		synproxy_init_timestamp_cookie(info, opts);
+	else
+		opts->options &= ~(NF_SYNPROXY_OPT_WSCALE |
+				   NF_SYNPROXY_OPT_SACK_PERM |
+				   NF_SYNPROXY_OPT_ECN);
+}
+
+static void nft_synproxy_eval_v4(const struct nft_synproxy *priv,
+				 struct nft_regs *regs,
+				 const struct nft_pktinfo *pkt,
+				 const struct tcphdr *tcp,
+				 struct tcphdr *_tcph,
+				 struct synproxy_options *opts)
+{
+	struct nf_synproxy_info info = priv->info;
+	struct net *net = nft_net(pkt);
+	struct synproxy_net *snet = synproxy_pernet(net);
+	struct sk_buff *skb = pkt->skb;
+
+	if (tcp->syn) {
+		/* Initial SYN from client */
+		nft_synproxy_tcp_options(opts, tcp, snet, &info, priv);
+		synproxy_send_client_synack(net, skb, tcp, opts);
+		consume_skb(skb);
+		regs->verdict.code = NF_STOLEN;
+	} else if (tcp->ack) {
+		/* ACK from client */
+		if (synproxy_recv_client_ack(net, skb, tcp, opts,
+					     ntohl(tcp->seq))) {
+			consume_skb(skb);
+			regs->verdict.code = NF_STOLEN;
+		} else {
+			regs->verdict.code = NF_DROP;
+		}
+	}
+}
+
+#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
+static void nft_synproxy_eval_v6(const struct nft_synproxy *priv,
+				 struct nft_regs *regs,
+				 const struct nft_pktinfo *pkt,
+				 const struct tcphdr *tcp,
+				 struct tcphdr *_tcph,
+				 struct synproxy_options *opts)
+{
+	struct nf_synproxy_info info = priv->info;
+	struct net *net = nft_net(pkt);
+	struct synproxy_net *snet = synproxy_pernet(net);
+	struct sk_buff *skb = pkt->skb;
+
+	if (tcp->syn) {
+		/* Initial SYN from client */
+		nft_synproxy_tcp_options(opts, tcp, snet, &info, priv);
+		synproxy_send_client_synack_ipv6(net, skb, tcp, opts);
+		consume_skb(skb);
+		regs->verdict.code = NF_STOLEN;
+	} else if (tcp->ack) {
+		/* ACK from client */
+		if (synproxy_recv_client_ack_ipv6(net, skb, tcp, opts,
+						  ntohl(tcp->seq))) {
+			consume_skb(skb);
+			regs->verdict.code = NF_STOLEN;
+		} else {
+			regs->verdict.code = NF_DROP;
+		}
+	}
+}
+#endif /* CONFIG_NF_TABLES_IPV6*/
+
+static void nft_synproxy_do_eval(const struct nft_synproxy *priv,
+				 struct nft_regs *regs,
+				 const struct nft_pktinfo *pkt)
+{
+	struct synproxy_options opts = {};
+	struct sk_buff *skb = pkt->skb;
+	int thoff = nft_thoff(pkt);
+	const struct tcphdr *tcp;
+	struct tcphdr _tcph;
+
+	if (pkt->tprot != IPPROTO_TCP) {
+		regs->verdict.code = NFT_BREAK;
+		return;
+	}
+
+	if (nf_ip_checksum(skb, nft_hook(pkt), thoff, IPPROTO_TCP)) {
+		regs->verdict.code = NF_DROP;
+		return;
+	}
+
+	tcp = skb_header_pointer(skb, thoff,
+				 sizeof(struct tcphdr),
+				 &_tcph);
+	if (!tcp) {
+		regs->verdict.code = NF_DROP;
+		return;
+	}
+
+	if (!synproxy_parse_options(skb, thoff, tcp, &opts)) {
+		regs->verdict.code = NF_DROP;
+		return;
+	}
+
+	switch (skb->protocol) {
+	case htons(ETH_P_IP):
+		nft_synproxy_eval_v4(priv, regs, pkt, tcp, &_tcph, &opts);
+		return;
+#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
+	case htons(ETH_P_IPV6):
+		nft_synproxy_eval_v6(priv, regs, pkt, tcp, &_tcph, &opts);
+		return;
+#endif
+	}
+	regs->verdict.code = NFT_BREAK;
+}
+
+static int nft_synproxy_do_init(const struct nft_ctx *ctx,
+				const struct nlattr * const tb[],
+				struct nft_synproxy *priv)
+{
+	struct synproxy_net *snet = synproxy_pernet(ctx->net);
+	u32 flags;
+	int err;
+
+	if (tb[NFTA_SYNPROXY_MSS])
+		priv->info.mss = ntohs(nla_get_be16(tb[NFTA_SYNPROXY_MSS]));
+	if (tb[NFTA_SYNPROXY_WSCALE])
+		priv->info.wscale = nla_get_u8(tb[NFTA_SYNPROXY_WSCALE]);
+	if (tb[NFTA_SYNPROXY_FLAGS]) {
+		flags = ntohl(nla_get_be32(tb[NFTA_SYNPROXY_FLAGS]));
+		if (flags & ~NF_SYNPROXY_OPT_MASK)
+			return -EOPNOTSUPP;
+		priv->info.options = flags;
+	}
+
+	err = nf_ct_netns_get(ctx->net, ctx->family);
+	if (err)
+		return err;
+
+	switch (ctx->family) {
+	case NFPROTO_IPV4:
+		err = nf_synproxy_ipv4_init(snet, ctx->net);
+		if (err)
+			goto nf_ct_failure;
+		break;
+#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
+	case NFPROTO_IPV6:
+		err = nf_synproxy_ipv6_init(snet, ctx->net);
+		if (err)
+			goto nf_ct_failure;
+		break;
+#endif
+	case NFPROTO_INET:
+	case NFPROTO_BRIDGE:
+		err = nf_synproxy_ipv4_init(snet, ctx->net);
+		if (err)
+			goto nf_ct_failure;
+		err = nf_synproxy_ipv6_init(snet, ctx->net);
+		if (err) {
+			nf_synproxy_ipv4_fini(snet, ctx->net);
+			goto nf_ct_failure;
+		}
+		break;
+	}
+
+	return 0;
+
+nf_ct_failure:
+	nf_ct_netns_put(ctx->net, ctx->family);
+	return err;
+}
+
+static void nft_synproxy_do_destroy(const struct nft_ctx *ctx)
+{
+	struct synproxy_net *snet = synproxy_pernet(ctx->net);
+
+	switch (ctx->family) {
+	case NFPROTO_IPV4:
+		nf_synproxy_ipv4_fini(snet, ctx->net);
+		break;
+#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
+	case NFPROTO_IPV6:
+		nf_synproxy_ipv6_fini(snet, ctx->net);
+		break;
+#endif
+	case NFPROTO_INET:
+	case NFPROTO_BRIDGE:
+		nf_synproxy_ipv4_fini(snet, ctx->net);
+		nf_synproxy_ipv6_fini(snet, ctx->net);
+		break;
+	}
+	nf_ct_netns_put(ctx->net, ctx->family);
+}
+
+static int nft_synproxy_do_dump(struct sk_buff *skb, struct nft_synproxy *priv)
+{
+	if (nla_put_be16(skb, NFTA_SYNPROXY_MSS, htons(priv->info.mss)) ||
+	    nla_put_u8(skb, NFTA_SYNPROXY_WSCALE, priv->info.wscale) ||
+	    nla_put_be32(skb, NFTA_SYNPROXY_FLAGS, htonl(priv->info.options)))
+		goto nla_put_failure;
+
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
+static void nft_synproxy_eval(const struct nft_expr *expr,
+			      struct nft_regs *regs,
+			      const struct nft_pktinfo *pkt)
+{
+	const struct nft_synproxy *priv = nft_expr_priv(expr);
+
+	nft_synproxy_do_eval(priv, regs, pkt);
+}
+
+static int nft_synproxy_validate(const struct nft_ctx *ctx,
+				 const struct nft_expr *expr,
+				 const struct nft_data **data)
+{
+	return nft_chain_validate_hooks(ctx->chain, (1 << NF_INET_LOCAL_IN) |
+						    (1 << NF_INET_FORWARD));
+}
+
+static int nft_synproxy_init(const struct nft_ctx *ctx,
+			     const struct nft_expr *expr,
+			     const struct nlattr * const tb[])
+{
+	struct nft_synproxy *priv = nft_expr_priv(expr);
+
+	return nft_synproxy_do_init(ctx, tb, priv);
+}
+
+static void nft_synproxy_destroy(const struct nft_ctx *ctx,
+				 const struct nft_expr *expr)
+{
+	nft_synproxy_do_destroy(ctx);
+}
+
+static int nft_synproxy_dump(struct sk_buff *skb,
+			     const struct nft_expr *expr, bool reset)
+{
+	struct nft_synproxy *priv = nft_expr_priv(expr);
+
+	return nft_synproxy_do_dump(skb, priv);
+}
+
+static struct nft_expr_type nft_synproxy_type;
+static const struct nft_expr_ops nft_synproxy_ops = {
+	.eval		= nft_synproxy_eval,
+	.size		= NFT_EXPR_SIZE(sizeof(struct nft_synproxy)),
+	.init		= nft_synproxy_init,
+	.destroy	= nft_synproxy_destroy,
+	.dump		= nft_synproxy_dump,
+	.type		= &nft_synproxy_type,
+	.validate	= nft_synproxy_validate,
+	.reduce		= NFT_REDUCE_READONLY,
+};
+
+static struct nft_expr_type nft_synproxy_type __read_mostly = {
+	.ops		= &nft_synproxy_ops,
+	.name		= "synproxy",
+	.owner		= THIS_MODULE,
+	.policy		= nft_synproxy_policy,
+	.maxattr	= NFTA_SYNPROXY_MAX,
+};
+
+static int nft_synproxy_obj_init(const struct nft_ctx *ctx,
+				 const struct nlattr * const tb[],
+				 struct nft_object *obj)
+{
+	struct nft_synproxy *priv = nft_obj_data(obj);
+
+	return nft_synproxy_do_init(ctx, tb, priv);
+}
+
+static void nft_synproxy_obj_destroy(const struct nft_ctx *ctx,
+				     struct nft_object *obj)
+{
+	nft_synproxy_do_destroy(ctx);
+}
+
+static int nft_synproxy_obj_dump(struct sk_buff *skb,
+				 struct nft_object *obj, bool reset)
+{
+	struct nft_synproxy *priv = nft_obj_data(obj);
+
+	return nft_synproxy_do_dump(skb, priv);
+}
+
+static void nft_synproxy_obj_eval(struct nft_object *obj,
+				  struct nft_regs *regs,
+				  const struct nft_pktinfo *pkt)
+{
+	const struct nft_synproxy *priv = nft_obj_data(obj);
+
+	nft_synproxy_do_eval(priv, regs, pkt);
+}
+
+static void nft_synproxy_obj_update(struct nft_object *obj,
+				    struct nft_object *newobj)
+{
+	struct nft_synproxy *newpriv = nft_obj_data(newobj);
+	struct nft_synproxy *priv = nft_obj_data(obj);
+
+	priv->info = newpriv->info;
+}
+
+static struct nft_object_type nft_synproxy_obj_type;
+static const struct nft_object_ops nft_synproxy_obj_ops = {
+	.type		= &nft_synproxy_obj_type,
+	.size		= sizeof(struct nft_synproxy),
+	.init		= nft_synproxy_obj_init,
+	.destroy	= nft_synproxy_obj_destroy,
+	.dump		= nft_synproxy_obj_dump,
+	.eval		= nft_synproxy_obj_eval,
+	.update		= nft_synproxy_obj_update,
+};
+
+static struct nft_object_type nft_synproxy_obj_type __read_mostly = {
+	.type		= NFT_OBJECT_SYNPROXY,
+	.ops		= &nft_synproxy_obj_ops,
+	.maxattr	= NFTA_SYNPROXY_MAX,
+	.policy		= nft_synproxy_policy,
+	.owner		= THIS_MODULE,
+};
+
+static int __init nft_synproxy_module_init(void)
+{
+	int err;
+
+	err = nft_register_obj(&nft_synproxy_obj_type);
+	if (err < 0)
+		return err;
+
+	err = nft_register_expr(&nft_synproxy_type);
+	if (err < 0)
+		goto err;
+
+	return 0;
+
+err:
+	nft_unregister_obj(&nft_synproxy_obj_type);
+	return err;
+}
+
+static void __exit nft_synproxy_module_exit(void)
+{
+	nft_unregister_expr(&nft_synproxy_type);
+	nft_unregister_obj(&nft_synproxy_obj_type);
+}
+
+module_init(nft_synproxy_module_init);
+module_exit(nft_synproxy_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Fernando Fernandez <ffmancera@riseup.net>");
+MODULE_ALIAS_NFT_EXPR("synproxy");
+MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_SYNPROXY);
+MODULE_DESCRIPTION("nftables SYNPROXY expression support");