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, 483 insertions, 0 deletions

diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
new file mode 100644
index 000000000..9ddc3a9e8
--- /dev/null
+++ b/net/dccp/dccp.h
@@ -0,0 +1,483 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _DCCP_H
+#define _DCCP_H
+/*
+ *  net/dccp/dccp.h
+ *
+ *  An implementation of the DCCP protocol
+ *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ *  Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
+ */
+
+#include <linux/dccp.h>
+#include <linux/ktime.h>
+#include <net/snmp.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+#include "ackvec.h"
+
+/*
+ * 	DCCP - specific warning and debugging macros.
+ */
+#define DCCP_WARN(fmt, ...)						\
+	net_warn_ratelimited("%s: " fmt, __func__, ##__VA_ARGS__)
+#define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \
+					 __FILE__, __LINE__, __func__)
+#define DCCP_BUG(a...)       do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0)
+#define DCCP_BUG_ON(cond)    do { if (unlikely((cond) != 0))		   \
+				     DCCP_BUG("\"%s\" holds (exception!)", \
+					      __stringify(cond));          \
+			     } while (0)
+
+#define DCCP_PRINTK(enable, fmt, args...)	do { if (enable)	     \
+							printk(fmt, ##args); \
+						} while(0)
+#define DCCP_PR_DEBUG(enable, fmt, a...)	DCCP_PRINTK(enable, KERN_DEBUG \
+						  "%s: " fmt, __func__, ##a)
+
+#ifdef CONFIG_IP_DCCP_DEBUG
+extern bool dccp_debug;
+#define dccp_pr_debug(format, a...)	  DCCP_PR_DEBUG(dccp_debug, format, ##a)
+#define dccp_pr_debug_cat(format, a...)   DCCP_PRINTK(dccp_debug, format, ##a)
+#define dccp_debug(fmt, a...)		  dccp_pr_debug_cat(KERN_DEBUG fmt, ##a)
+#else
+#define dccp_pr_debug(format, a...)	  do {} while (0)
+#define dccp_pr_debug_cat(format, a...)	  do {} while (0)
+#define dccp_debug(format, a...)	  do {} while (0)
+#endif
+
+extern struct inet_hashinfo dccp_hashinfo;
+
+DECLARE_PER_CPU(unsigned int, dccp_orphan_count);
+
+void dccp_time_wait(struct sock *sk, int state, int timeo);
+
+/*
+ *  Set safe upper bounds for header and option length. Since Data Offset is 8
+ *  bits (RFC 4340, sec. 5.1), the total header length can never be more than
+ *  4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):
+ *    - DCCP-Response with ACK Subheader and 4 bytes of Service code      OR
+ *    - DCCP-Reset    with ACK Subheader and 4 bytes of Reset Code fields
+ *  Hence a safe upper bound for the maximum option length is 1020-28 = 992
+ */
+#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(uint32_t))
+#define DCCP_MAX_PACKET_HDR 28
+#define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
+#define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)
+
+/* Upper bound for initial feature-negotiation overhead (padded to 32 bits) */
+#define DCCP_FEATNEG_OVERHEAD	 (32 * sizeof(uint32_t))
+
+#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
+				     * state, about 60 seconds */
+
+/* RFC 1122, 4.2.3.1 initial RTO value */
+#define DCCP_TIMEOUT_INIT ((unsigned int)(3 * HZ))
+
+/*
+ * The maximum back-off value for retransmissions. This is needed for
+ *  - retransmitting client-Requests (sec. 8.1.1),
+ *  - retransmitting Close/CloseReq when closing (sec. 8.3),
+ *  - feature-negotiation retransmission (sec. 6.6.3),
+ *  - Acks in client-PARTOPEN state (sec. 8.1.5).
+ */
+#define DCCP_RTO_MAX ((unsigned int)(64 * HZ))
+
+/*
+ * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4
+ */
+#define DCCP_SANE_RTT_MIN	100
+#define DCCP_FALLBACK_RTT	(USEC_PER_SEC / 5)
+#define DCCP_SANE_RTT_MAX	(3 * USEC_PER_SEC)
+
+/* sysctl variables for DCCP */
+extern int  sysctl_dccp_request_retries;
+extern int  sysctl_dccp_retries1;
+extern int  sysctl_dccp_retries2;
+extern int  sysctl_dccp_tx_qlen;
+extern int  sysctl_dccp_sync_ratelimit;
+
+/*
+ *	48-bit sequence number arithmetic (signed and unsigned)
+ */
+#define INT48_MIN	  0x800000000000LL		/* 2^47	    */
+#define UINT48_MAX	  0xFFFFFFFFFFFFLL		/* 2^48 - 1 */
+#define COMPLEMENT48(x)	 (0x1000000000000LL - (x))	/* 2^48 - x */
+#define TO_SIGNED48(x)	 (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x)))
+#define TO_UNSIGNED48(x) (((x) >= 0)?	     (x) :  COMPLEMENT48(-(x)))
+#define ADD48(a, b)	 (((a) + (b)) & UINT48_MAX)
+#define SUB48(a, b)	 ADD48((a), COMPLEMENT48(b))
+
+static inline void dccp_inc_seqno(u64 *seqno)
+{
+	*seqno = ADD48(*seqno, 1);
+}
+
+/* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */
+static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2)
+{
+	u64 delta = SUB48(seqno2, seqno1);
+
+	return TO_SIGNED48(delta);
+}
+
+/* is seq1 < seq2 ? */
+static inline int before48(const u64 seq1, const u64 seq2)
+{
+	return (s64)((seq2 << 16) - (seq1 << 16)) > 0;
+}
+
+/* is seq1 > seq2 ? */
+#define after48(seq1, seq2)	before48(seq2, seq1)
+
+/* is seq2 <= seq1 <= seq3 ? */
+static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
+{
+	return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
+}
+
+/**
+ * dccp_loss_count - Approximate the number of lost data packets in a burst loss
+ * @s1:  last known sequence number before the loss ('hole')
+ * @s2:  first sequence number seen after the 'hole'
+ * @ndp: NDP count on packet with sequence number @s2
+ */
+static inline u64 dccp_loss_count(const u64 s1, const u64 s2, const u64 ndp)
+{
+	s64 delta = dccp_delta_seqno(s1, s2);
+
+	WARN_ON(delta < 0);
+	delta -= ndp + 1;
+
+	return delta > 0 ? delta : 0;
+}
+
+/**
+ * dccp_loss_free - Evaluate condition for data loss from RFC 4340, 7.7.1
+ */
+static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp)
+{
+	return dccp_loss_count(s1, s2, ndp) == 0;
+}
+
+enum {
+	DCCP_MIB_NUM = 0,
+	DCCP_MIB_ACTIVEOPENS,			/* ActiveOpens */
+	DCCP_MIB_ESTABRESETS,			/* EstabResets */
+	DCCP_MIB_CURRESTAB,			/* CurrEstab */
+	DCCP_MIB_OUTSEGS,			/* OutSegs */
+	DCCP_MIB_OUTRSTS,
+	DCCP_MIB_ABORTONTIMEOUT,
+	DCCP_MIB_TIMEOUTS,
+	DCCP_MIB_ABORTFAILED,
+	DCCP_MIB_PASSIVEOPENS,
+	DCCP_MIB_ATTEMPTFAILS,
+	DCCP_MIB_OUTDATAGRAMS,
+	DCCP_MIB_INERRS,
+	DCCP_MIB_OPTMANDATORYERROR,
+	DCCP_MIB_INVALIDOPT,
+	__DCCP_MIB_MAX
+};
+
+#define DCCP_MIB_MAX	__DCCP_MIB_MAX
+struct dccp_mib {
+	unsigned long	mibs[DCCP_MIB_MAX];
+};
+
+DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
+#define DCCP_INC_STATS(field)	SNMP_INC_STATS(dccp_statistics, field)
+#define __DCCP_INC_STATS(field)	__SNMP_INC_STATS(dccp_statistics, field)
+#define DCCP_DEC_STATS(field)	SNMP_DEC_STATS(dccp_statistics, field)
+
+/*
+ * 	Checksumming routines
+ */
+static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb)
+{
+	const struct dccp_hdr* dh = dccp_hdr(skb);
+
+	if (dh->dccph_cscov == 0)
+		return skb->len;
+	return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32);
+}
+
+static inline void dccp_csum_outgoing(struct sk_buff *skb)
+{
+	unsigned int cov = dccp_csum_coverage(skb);
+
+	if (cov >= skb->len)
+		dccp_hdr(skb)->dccph_cscov = 0;
+
+	skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0);
+}
+
+void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb);
+
+int dccp_retransmit_skb(struct sock *sk);
+
+void dccp_send_ack(struct sock *sk);
+void dccp_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
+			 struct request_sock *rsk);
+
+void dccp_send_sync(struct sock *sk, const u64 seq,
+		    const enum dccp_pkt_type pkt_type);
+
+/*
+ * TX Packet Dequeueing Interface
+ */
+void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb);
+bool dccp_qpolicy_full(struct sock *sk);
+void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb);
+struct sk_buff *dccp_qpolicy_top(struct sock *sk);
+struct sk_buff *dccp_qpolicy_pop(struct sock *sk);
+bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param);
+
+/*
+ * TX Packet Output and TX Timers
+ */
+void dccp_write_xmit(struct sock *sk);
+void dccp_write_space(struct sock *sk);
+void dccp_flush_write_queue(struct sock *sk, long *time_budget);
+
+void dccp_init_xmit_timers(struct sock *sk);
+static inline void dccp_clear_xmit_timers(struct sock *sk)
+{
+	inet_csk_clear_xmit_timers(sk);
+}
+
+unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
+
+const char *dccp_packet_name(const int type);
+
+void dccp_set_state(struct sock *sk, const int state);
+void dccp_done(struct sock *sk);
+
+int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp,
+		    struct sk_buff const *skb);
+
+int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
+
+struct sock *dccp_create_openreq_child(const struct sock *sk,
+				       const struct request_sock *req,
+				       const struct sk_buff *skb);
+
+int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
+
+struct sock *dccp_v4_request_recv_sock(const struct sock *sk, struct sk_buff *skb,
+				       struct request_sock *req,
+				       struct dst_entry *dst,
+				       struct request_sock *req_unhash,
+				       bool *own_req);
+struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
+			    struct request_sock *req);
+
+int dccp_child_process(struct sock *parent, struct sock *child,
+		       struct sk_buff *skb);
+int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
+			   struct dccp_hdr *dh, unsigned int len);
+int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
+			 const struct dccp_hdr *dh, const unsigned int len);
+
+void dccp_destruct_common(struct sock *sk);
+int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
+void dccp_destroy_sock(struct sock *sk);
+
+void dccp_close(struct sock *sk, long timeout);
+struct sk_buff *dccp_make_response(const struct sock *sk, struct dst_entry *dst,
+				   struct request_sock *req);
+
+int dccp_connect(struct sock *sk);
+int dccp_disconnect(struct sock *sk, int flags);
+int dccp_getsockopt(struct sock *sk, int level, int optname,
+		    char __user *optval, int __user *optlen);
+int dccp_setsockopt(struct sock *sk, int level, int optname,
+		    sockptr_t optval, unsigned int optlen);
+int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
+int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
+int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int flags,
+		 int *addr_len);
+void dccp_shutdown(struct sock *sk, int how);
+int inet_dccp_listen(struct socket *sock, int backlog);
+__poll_t dccp_poll(struct file *file, struct socket *sock,
+		       poll_table *wait);
+int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
+void dccp_req_err(struct sock *sk, u64 seq);
+
+struct sk_buff *dccp_ctl_make_reset(struct sock *sk, struct sk_buff *skb);
+int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
+void dccp_send_close(struct sock *sk, const int active);
+int dccp_invalid_packet(struct sk_buff *skb);
+u32 dccp_sample_rtt(struct sock *sk, long delta);
+
+static inline bool dccp_bad_service_code(const struct sock *sk,
+					const __be32 service)
+{
+	const struct dccp_sock *dp = dccp_sk(sk);
+
+	if (dp->dccps_service == service)
+		return false;
+	return !dccp_list_has_service(dp->dccps_service_list, service);
+}
+
+/**
+ * dccp_skb_cb  -  DCCP per-packet control information
+ * @dccpd_type: one of %dccp_pkt_type (or unknown)
+ * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1
+ * @dccpd_reset_code: one of %dccp_reset_codes
+ * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code)
+ * @dccpd_opt_len: total length of all options (5.8) in the packet
+ * @dccpd_seq: sequence number
+ * @dccpd_ack_seq: acknowledgment number subheader field value
+ *
+ * This is used for transmission as well as for reception.
+ */
+struct dccp_skb_cb {
+	union {
+		struct inet_skb_parm	h4;
+#if IS_ENABLED(CONFIG_IPV6)
+		struct inet6_skb_parm	h6;
+#endif
+	} header;
+	__u8  dccpd_type:4;
+	__u8  dccpd_ccval:4;
+	__u8  dccpd_reset_code,
+	      dccpd_reset_data[3];
+	__u16 dccpd_opt_len;
+	__u64 dccpd_seq;
+	__u64 dccpd_ack_seq;
+};
+
+#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
+
+/* RFC 4340, sec. 7.7 */
+static inline int dccp_non_data_packet(const struct sk_buff *skb)
+{
+	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
+
+	return type == DCCP_PKT_ACK	 ||
+	       type == DCCP_PKT_CLOSE	 ||
+	       type == DCCP_PKT_CLOSEREQ ||
+	       type == DCCP_PKT_RESET	 ||
+	       type == DCCP_PKT_SYNC	 ||
+	       type == DCCP_PKT_SYNCACK;
+}
+
+/* RFC 4340, sec. 7.7 */
+static inline int dccp_data_packet(const struct sk_buff *skb)
+{
+	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
+
+	return type == DCCP_PKT_DATA	 ||
+	       type == DCCP_PKT_DATAACK  ||
+	       type == DCCP_PKT_REQUEST  ||
+	       type == DCCP_PKT_RESPONSE;
+}
+
+static inline int dccp_packet_without_ack(const struct sk_buff *skb)
+{
+	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
+
+	return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
+}
+
+#define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2)
+
+static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
+{
+	struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
+							   sizeof(*dh));
+	dh->dccph_seq2 = 0;
+	dh->dccph_seq = htons((gss >> 32) & 0xfffff);
+	dhx->dccph_seq_low = htonl(gss & 0xffffffff);
+}
+
+static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
+				    const u64 gsr)
+{
+	dhack->dccph_reserved1 = 0;
+	dhack->dccph_ack_nr_high = htons(gsr >> 32);
+	dhack->dccph_ack_nr_low  = htonl(gsr & 0xffffffff);
+}
+
+static inline void dccp_update_gsr(struct sock *sk, u64 seq)
+{
+	struct dccp_sock *dp = dccp_sk(sk);
+
+	if (after48(seq, dp->dccps_gsr))
+		dp->dccps_gsr = seq;
+	/* Sequence validity window depends on remote Sequence Window (7.5.1) */
+	dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4);
+	/*
+	 * Adjust SWL so that it is not below ISR. In contrast to RFC 4340,
+	 * 7.5.1 we perform this check beyond the initial handshake: W/W' are
+	 * always > 32, so for the first W/W' packets in the lifetime of a
+	 * connection we always have to adjust SWL.
+	 * A second reason why we are doing this is that the window depends on
+	 * the feature-remote value of Sequence Window: nothing stops the peer
+	 * from updating this value while we are busy adjusting SWL for the
+	 * first W packets (we would have to count from scratch again then).
+	 * Therefore it is safer to always make sure that the Sequence Window
+	 * is not artificially extended by a peer who grows SWL downwards by
+	 * continually updating the feature-remote Sequence-Window.
+	 * If sequence numbers wrap it is bad luck. But that will take a while
+	 * (48 bit), and this measure prevents Sequence-number attacks.
+	 */
+	if (before48(dp->dccps_swl, dp->dccps_isr))
+		dp->dccps_swl = dp->dccps_isr;
+	dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4);
+}
+
+static inline void dccp_update_gss(struct sock *sk, u64 seq)
+{
+	struct dccp_sock *dp = dccp_sk(sk);
+
+	dp->dccps_gss = seq;
+	/* Ack validity window depends on local Sequence Window value (7.5.1) */
+	dp->dccps_awl = SUB48(ADD48(dp->dccps_gss, 1), dp->dccps_l_seq_win);
+	/* Adjust AWL so that it is not below ISS - see comment above for SWL */
+	if (before48(dp->dccps_awl, dp->dccps_iss))
+		dp->dccps_awl = dp->dccps_iss;
+	dp->dccps_awh = dp->dccps_gss;
+}
+
+static inline int dccp_ackvec_pending(const struct sock *sk)
+{
+	return dccp_sk(sk)->dccps_hc_rx_ackvec != NULL &&
+	       !dccp_ackvec_is_empty(dccp_sk(sk)->dccps_hc_rx_ackvec);
+}
+
+static inline int dccp_ack_pending(const struct sock *sk)
+{
+	return dccp_ackvec_pending(sk) || inet_csk_ack_scheduled(sk);
+}
+
+int dccp_feat_signal_nn_change(struct sock *sk, u8 feat, u64 nn_val);
+int dccp_feat_finalise_settings(struct dccp_sock *dp);
+int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq);
+int dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*,
+			  struct sk_buff *skb);
+int dccp_feat_activate_values(struct sock *sk, struct list_head *fn);
+void dccp_feat_list_purge(struct list_head *fn_list);
+
+int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
+int dccp_insert_options_rsk(struct dccp_request_sock *, struct sk_buff *);
+u32 dccp_timestamp(void);
+void dccp_timestamping_init(void);
+int dccp_insert_option(struct sk_buff *skb, unsigned char option,
+		       const void *value, unsigned char len);
+
+#ifdef CONFIG_SYSCTL
+int dccp_sysctl_init(void);
+void dccp_sysctl_exit(void);
+#else
+static inline int dccp_sysctl_init(void)
+{
+	return 0;
+}
+
+static inline void dccp_sysctl_exit(void)
+{
+}
+#endif
+
+#endif /* _DCCP_H */