Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1409 insertions, 0 deletions

diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
new file mode 100644
index 0000000000..e8b4340813
--- /dev/null
+++ b/net/rxrpc/ar-internal.h
@@ -0,0 +1,1409 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* AF_RXRPC internal definitions
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/atomic.h>
+#include <linux/seqlock.h>
+#include <linux/win_minmax.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <keys/rxrpc-type.h>
+#include "protocol.h"
+
+#define FCRYPT_BSIZE 8
+struct rxrpc_crypt {
+	union {
+		u8	x[FCRYPT_BSIZE];
+		__be32	n[2];
+	};
+} __attribute__((aligned(8)));
+
+#define rxrpc_queue_work(WS)	queue_work(rxrpc_workqueue, (WS))
+#define rxrpc_queue_delayed_work(WS,D)	\
+	queue_delayed_work(rxrpc_workqueue, (WS), (D))
+
+struct key_preparsed_payload;
+struct rxrpc_connection;
+struct rxrpc_txbuf;
+
+/*
+ * Mark applied to socket buffers in skb->mark.  skb->priority is used
+ * to pass supplementary information.
+ */
+enum rxrpc_skb_mark {
+	RXRPC_SKB_MARK_PACKET,		/* Received packet */
+	RXRPC_SKB_MARK_ERROR,		/* Error notification */
+	RXRPC_SKB_MARK_SERVICE_CONN_SECURED, /* Service connection response has been verified */
+	RXRPC_SKB_MARK_REJECT_BUSY,	/* Reject with BUSY */
+	RXRPC_SKB_MARK_REJECT_ABORT,	/* Reject with ABORT (code in skb->priority) */
+};
+
+/*
+ * sk_state for RxRPC sockets
+ */
+enum {
+	RXRPC_UNBOUND = 0,
+	RXRPC_CLIENT_UNBOUND,		/* Unbound socket used as client */
+	RXRPC_CLIENT_BOUND,		/* client local address bound */
+	RXRPC_SERVER_BOUND,		/* server local address bound */
+	RXRPC_SERVER_BOUND2,		/* second server local address bound */
+	RXRPC_SERVER_LISTENING,		/* server listening for connections */
+	RXRPC_SERVER_LISTEN_DISABLED,	/* server listening disabled */
+	RXRPC_CLOSE,			/* socket is being closed */
+};
+
+/*
+ * Per-network namespace data.
+ */
+struct rxrpc_net {
+	struct proc_dir_entry	*proc_net;	/* Subdir in /proc/net */
+	u32			epoch;		/* Local epoch for detecting local-end reset */
+	struct list_head	calls;		/* List of calls active in this namespace */
+	spinlock_t		call_lock;	/* Lock for ->calls */
+	atomic_t		nr_calls;	/* Count of allocated calls */
+
+	atomic_t		nr_conns;
+	struct list_head	conn_proc_list;	/* List of conns in this namespace for proc */
+	struct list_head	service_conns;	/* Service conns in this namespace */
+	rwlock_t		conn_lock;	/* Lock for ->conn_proc_list, ->service_conns */
+	struct work_struct	service_conn_reaper;
+	struct timer_list	service_conn_reap_timer;
+
+	bool			live;
+
+	atomic_t		nr_client_conns;
+
+	struct hlist_head	local_endpoints;
+	struct mutex		local_mutex;	/* Lock for ->local_endpoints */
+
+	DECLARE_HASHTABLE	(peer_hash, 10);
+	spinlock_t		peer_hash_lock;	/* Lock for ->peer_hash */
+
+#define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
+	u8			peer_keepalive_cursor;
+	time64_t		peer_keepalive_base;
+	struct list_head	peer_keepalive[32];
+	struct list_head	peer_keepalive_new;
+	struct timer_list	peer_keepalive_timer;
+	struct work_struct	peer_keepalive_work;
+
+	atomic_t		stat_tx_data;
+	atomic_t		stat_tx_data_retrans;
+	atomic_t		stat_tx_data_send;
+	atomic_t		stat_tx_data_send_frag;
+	atomic_t		stat_tx_data_send_fail;
+	atomic_t		stat_tx_data_underflow;
+	atomic_t		stat_tx_data_cwnd_reset;
+	atomic_t		stat_rx_data;
+	atomic_t		stat_rx_data_reqack;
+	atomic_t		stat_rx_data_jumbo;
+
+	atomic_t		stat_tx_ack_fill;
+	atomic_t		stat_tx_ack_send;
+	atomic_t		stat_tx_ack_skip;
+	atomic_t		stat_tx_acks[256];
+	atomic_t		stat_rx_acks[256];
+
+	atomic_t		stat_why_req_ack[8];
+
+	atomic_t		stat_io_loop;
+};
+
+/*
+ * Service backlog preallocation.
+ *
+ * This contains circular buffers of preallocated peers, connections and calls
+ * for incoming service calls and their head and tail pointers.  This allows
+ * calls to be set up in the data_ready handler, thereby avoiding the need to
+ * shuffle packets around so much.
+ */
+struct rxrpc_backlog {
+	unsigned short		peer_backlog_head;
+	unsigned short		peer_backlog_tail;
+	unsigned short		conn_backlog_head;
+	unsigned short		conn_backlog_tail;
+	unsigned short		call_backlog_head;
+	unsigned short		call_backlog_tail;
+#define RXRPC_BACKLOG_MAX	32
+	struct rxrpc_peer	*peer_backlog[RXRPC_BACKLOG_MAX];
+	struct rxrpc_connection	*conn_backlog[RXRPC_BACKLOG_MAX];
+	struct rxrpc_call	*call_backlog[RXRPC_BACKLOG_MAX];
+};
+
+/*
+ * RxRPC socket definition
+ */
+struct rxrpc_sock {
+	/* WARNING: sk has to be the first member */
+	struct sock		sk;
+	rxrpc_notify_new_call_t	notify_new_call; /* Func to notify of new call */
+	rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
+	struct rxrpc_local	*local;		/* local endpoint */
+	struct rxrpc_backlog	*backlog;	/* Preallocation for services */
+	spinlock_t		incoming_lock;	/* Incoming call vs service shutdown lock */
+	struct list_head	sock_calls;	/* List of calls owned by this socket */
+	struct list_head	to_be_accepted;	/* calls awaiting acceptance */
+	struct list_head	recvmsg_q;	/* Calls awaiting recvmsg's attention  */
+	spinlock_t		recvmsg_lock;	/* Lock for recvmsg_q */
+	struct key		*key;		/* security for this socket */
+	struct key		*securities;	/* list of server security descriptors */
+	struct rb_root		calls;		/* User ID -> call mapping */
+	unsigned long		flags;
+#define RXRPC_SOCK_CONNECTED		0	/* connect_srx is set */
+	rwlock_t		call_lock;	/* lock for calls */
+	u32			min_sec_level;	/* minimum security level */
+#define RXRPC_SECURITY_MAX	RXRPC_SECURITY_ENCRYPT
+	bool			exclusive;	/* Exclusive connection for a client socket */
+	u16			second_service;	/* Additional service bound to the endpoint */
+	struct {
+		/* Service upgrade information */
+		u16		from;		/* Service ID to upgrade (if not 0) */
+		u16		to;		/* service ID to upgrade to */
+	} service_upgrade;
+	sa_family_t		family;		/* Protocol family created with */
+	struct sockaddr_rxrpc	srx;		/* Primary Service/local addresses */
+	struct sockaddr_rxrpc	connect_srx;	/* Default client address from connect() */
+};
+
+#define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
+
+/*
+ * CPU-byteorder normalised Rx packet header.
+ */
+struct rxrpc_host_header {
+	u32		epoch;		/* client boot timestamp */
+	u32		cid;		/* connection and channel ID */
+	u32		callNumber;	/* call ID (0 for connection-level packets) */
+	u32		seq;		/* sequence number of pkt in call stream */
+	u32		serial;		/* serial number of pkt sent to network */
+	u8		type;		/* packet type */
+	u8		flags;		/* packet flags */
+	u8		userStatus;	/* app-layer defined status */
+	u8		securityIndex;	/* security protocol ID */
+	union {
+		u16	_rsvd;		/* reserved */
+		u16	cksum;		/* kerberos security checksum */
+	};
+	u16		serviceId;	/* service ID */
+} __packed;
+
+/*
+ * RxRPC socket buffer private variables
+ * - max 48 bytes (struct sk_buff::cb)
+ */
+struct rxrpc_skb_priv {
+	struct rxrpc_connection *conn;	/* Connection referred to (poke packet) */
+	u16		offset;		/* Offset of data */
+	u16		len;		/* Length of data */
+	u8		flags;
+#define RXRPC_RX_VERIFIED	0x01
+
+	struct rxrpc_host_header hdr;	/* RxRPC packet header from this packet */
+};
+
+#define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
+
+/*
+ * RxRPC security module interface
+ */
+struct rxrpc_security {
+	const char		*name;		/* name of this service */
+	u8			security_index;	/* security type provided */
+	u32			no_key_abort;	/* Abort code indicating no key */
+
+	/* Initialise a security service */
+	int (*init)(void);
+
+	/* Clean up a security service */
+	void (*exit)(void);
+
+	/* Parse the information from a server key */
+	int (*preparse_server_key)(struct key_preparsed_payload *);
+
+	/* Clean up the preparse buffer after parsing a server key */
+	void (*free_preparse_server_key)(struct key_preparsed_payload *);
+
+	/* Destroy the payload of a server key */
+	void (*destroy_server_key)(struct key *);
+
+	/* Describe a server key */
+	void (*describe_server_key)(const struct key *, struct seq_file *);
+
+	/* initialise a connection's security */
+	int (*init_connection_security)(struct rxrpc_connection *,
+					struct rxrpc_key_token *);
+
+	/* Work out how much data we can store in a packet, given an estimate
+	 * of the amount of data remaining.
+	 */
+	int (*how_much_data)(struct rxrpc_call *, size_t,
+			     size_t *, size_t *, size_t *);
+
+	/* impose security on a packet */
+	int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *);
+
+	/* verify the security on a received packet */
+	int (*verify_packet)(struct rxrpc_call *, struct sk_buff *);
+
+	/* Free crypto request on a call */
+	void (*free_call_crypto)(struct rxrpc_call *);
+
+	/* issue a challenge */
+	int (*issue_challenge)(struct rxrpc_connection *);
+
+	/* respond to a challenge */
+	int (*respond_to_challenge)(struct rxrpc_connection *,
+				    struct sk_buff *);
+
+	/* verify a response */
+	int (*verify_response)(struct rxrpc_connection *,
+			       struct sk_buff *);
+
+	/* clear connection security */
+	void (*clear)(struct rxrpc_connection *);
+};
+
+/*
+ * RxRPC local transport endpoint description
+ * - owned by a single AF_RXRPC socket
+ * - pointed to by transport socket struct sk_user_data
+ */
+struct rxrpc_local {
+	struct rcu_head		rcu;
+	atomic_t		active_users;	/* Number of users of the local endpoint */
+	refcount_t		ref;		/* Number of references to the structure */
+	struct net		*net;		/* The network namespace */
+	struct rxrpc_net	*rxnet;		/* Our bits in the network namespace */
+	struct hlist_node	link;
+	struct socket		*socket;	/* my UDP socket */
+	struct task_struct	*io_thread;
+	struct completion	io_thread_ready; /* Indication that the I/O thread started */
+	struct rxrpc_sock	*service;	/* Service(s) listening on this endpoint */
+#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
+	struct sk_buff_head	rx_delay_queue;	/* Delay injection queue */
+#endif
+	struct sk_buff_head	rx_queue;	/* Received packets */
+	struct list_head	conn_attend_q;	/* Conns requiring immediate attention */
+	struct list_head	call_attend_q;	/* Calls requiring immediate attention */
+
+	struct rb_root		client_bundles;	/* Client connection bundles by socket params */
+	spinlock_t		client_bundles_lock; /* Lock for client_bundles */
+	bool			kill_all_client_conns;
+	struct list_head	idle_client_conns;
+	struct timer_list	client_conn_reap_timer;
+	unsigned long		client_conn_flags;
+#define RXRPC_CLIENT_CONN_REAP_TIMER	0	/* The client conn reap timer expired */
+
+	spinlock_t		lock;		/* access lock */
+	rwlock_t		services_lock;	/* lock for services list */
+	int			debug_id;	/* debug ID for printks */
+	bool			dead;
+	bool			service_closed;	/* Service socket closed */
+	struct idr		conn_ids;	/* List of connection IDs */
+	struct list_head	new_client_calls; /* Newly created client calls need connection */
+	spinlock_t		client_call_lock; /* Lock for ->new_client_calls */
+	struct sockaddr_rxrpc	srx;		/* local address */
+};
+
+/*
+ * RxRPC remote transport endpoint definition
+ * - matched by local endpoint, remote port, address and protocol type
+ */
+struct rxrpc_peer {
+	struct rcu_head		rcu;		/* This must be first */
+	refcount_t		ref;
+	unsigned long		hash_key;
+	struct hlist_node	hash_link;
+	struct rxrpc_local	*local;
+	struct hlist_head	error_targets;	/* targets for net error distribution */
+	struct rb_root		service_conns;	/* Service connections */
+	struct list_head	keepalive_link;	/* Link in net->peer_keepalive[] */
+	time64_t		last_tx_at;	/* Last time packet sent here */
+	seqlock_t		service_conn_lock;
+	spinlock_t		lock;		/* access lock */
+	unsigned int		if_mtu;		/* interface MTU for this peer */
+	unsigned int		mtu;		/* network MTU for this peer */
+	unsigned int		maxdata;	/* data size (MTU - hdrsize) */
+	unsigned short		hdrsize;	/* header size (IP + UDP + RxRPC) */
+	int			debug_id;	/* debug ID for printks */
+	struct sockaddr_rxrpc	srx;		/* remote address */
+
+	/* calculated RTT cache */
+#define RXRPC_RTT_CACHE_SIZE 32
+	spinlock_t		rtt_input_lock;	/* RTT lock for input routine */
+	ktime_t			rtt_last_req;	/* Time of last RTT request */
+	unsigned int		rtt_count;	/* Number of samples we've got */
+
+	u32			srtt_us;	/* smoothed round trip time << 3 in usecs */
+	u32			mdev_us;	/* medium deviation			*/
+	u32			mdev_max_us;	/* maximal mdev for the last rtt period	*/
+	u32			rttvar_us;	/* smoothed mdev_max			*/
+	u32			rto_j;		/* Retransmission timeout in jiffies */
+	u8			backoff;	/* Backoff timeout */
+
+	u8			cong_ssthresh;	/* Congestion slow-start threshold */
+};
+
+/*
+ * Keys for matching a connection.
+ */
+struct rxrpc_conn_proto {
+	union {
+		struct {
+			u32	epoch;		/* epoch of this connection */
+			u32	cid;		/* connection ID */
+		};
+		u64		index_key;
+	};
+};
+
+struct rxrpc_conn_parameters {
+	struct rxrpc_local	*local;		/* Representation of local endpoint */
+	struct key		*key;		/* Security details */
+	bool			exclusive;	/* T if conn is exclusive */
+	bool			upgrade;	/* T if service ID can be upgraded */
+	u16			service_id;	/* Service ID for this connection */
+	u32			security_level;	/* Security level selected */
+};
+
+/*
+ * Call completion condition (state == RXRPC_CALL_COMPLETE).
+ */
+enum rxrpc_call_completion {
+	RXRPC_CALL_SUCCEEDED,		/* - Normal termination */
+	RXRPC_CALL_REMOTELY_ABORTED,	/* - call aborted by peer */
+	RXRPC_CALL_LOCALLY_ABORTED,	/* - call aborted locally on error or close */
+	RXRPC_CALL_LOCAL_ERROR,		/* - call failed due to local error */
+	RXRPC_CALL_NETWORK_ERROR,	/* - call terminated by network error */
+	NR__RXRPC_CALL_COMPLETIONS
+};
+
+/*
+ * Bits in the connection flags.
+ */
+enum rxrpc_conn_flag {
+	RXRPC_CONN_IN_SERVICE_CONNS,	/* Conn is in peer->service_conns */
+	RXRPC_CONN_DONT_REUSE,		/* Don't reuse this connection */
+	RXRPC_CONN_PROBING_FOR_UPGRADE,	/* Probing for service upgrade */
+	RXRPC_CONN_FINAL_ACK_0,		/* Need final ACK for channel 0 */
+	RXRPC_CONN_FINAL_ACK_1,		/* Need final ACK for channel 1 */
+	RXRPC_CONN_FINAL_ACK_2,		/* Need final ACK for channel 2 */
+	RXRPC_CONN_FINAL_ACK_3,		/* Need final ACK for channel 3 */
+};
+
+#define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) |	\
+				   (1UL << RXRPC_CONN_FINAL_ACK_1) |	\
+				   (1UL << RXRPC_CONN_FINAL_ACK_2) |	\
+				   (1UL << RXRPC_CONN_FINAL_ACK_3))
+
+/*
+ * Events that can be raised upon a connection.
+ */
+enum rxrpc_conn_event {
+	RXRPC_CONN_EV_CHALLENGE,	/* Send challenge packet */
+	RXRPC_CONN_EV_ABORT_CALLS,	/* Abort attached calls */
+};
+
+/*
+ * The connection protocol state.
+ */
+enum rxrpc_conn_proto_state {
+	RXRPC_CONN_UNUSED,		/* Connection not yet attempted */
+	RXRPC_CONN_CLIENT_UNSECURED,	/* Client connection needs security init */
+	RXRPC_CONN_CLIENT,		/* Client connection */
+	RXRPC_CONN_SERVICE_PREALLOC,	/* Service connection preallocation */
+	RXRPC_CONN_SERVICE_UNSECURED,	/* Service unsecured connection */
+	RXRPC_CONN_SERVICE_CHALLENGING,	/* Service challenging for security */
+	RXRPC_CONN_SERVICE,		/* Service secured connection */
+	RXRPC_CONN_ABORTED,		/* Conn aborted */
+	RXRPC_CONN__NR_STATES
+};
+
+/*
+ * RxRPC client connection bundle.
+ */
+struct rxrpc_bundle {
+	struct rxrpc_local	*local;		/* Representation of local endpoint */
+	struct rxrpc_peer	*peer;		/* Remote endpoint */
+	struct key		*key;		/* Security details */
+	const struct rxrpc_security *security;	/* applied security module */
+	refcount_t		ref;
+	atomic_t		active;		/* Number of active users */
+	unsigned int		debug_id;
+	u32			security_level;	/* Security level selected */
+	u16			service_id;	/* Service ID for this connection */
+	bool			try_upgrade;	/* True if the bundle is attempting upgrade */
+	bool			exclusive;	/* T if conn is exclusive */
+	bool			upgrade;	/* T if service ID can be upgraded */
+	unsigned short		alloc_error;	/* Error from last conn allocation */
+	struct rb_node		local_node;	/* Node in local->client_conns */
+	struct list_head	waiting_calls;	/* Calls waiting for channels */
+	unsigned long		avail_chans;	/* Mask of available channels */
+	struct rxrpc_connection	*conns[4];	/* The connections in the bundle (max 4) */
+};
+
+/*
+ * RxRPC connection definition
+ * - matched by { local, peer, epoch, conn_id, direction }
+ * - each connection can only handle four simultaneous calls
+ */
+struct rxrpc_connection {
+	struct rxrpc_conn_proto	proto;
+	struct rxrpc_local	*local;		/* Representation of local endpoint */
+	struct rxrpc_peer	*peer;		/* Remote endpoint */
+	struct rxrpc_net	*rxnet;		/* Network namespace to which call belongs */
+	struct key		*key;		/* Security details */
+	struct list_head	attend_link;	/* Link in local->conn_attend_q */
+
+	refcount_t		ref;
+	atomic_t		active;		/* Active count for service conns */
+	struct rcu_head		rcu;
+	struct list_head	cache_link;
+
+	unsigned char		act_chans;	/* Mask of active channels */
+	struct rxrpc_channel {
+		unsigned long		final_ack_at;	/* Time at which to issue final ACK */
+		struct rxrpc_call	*call;		/* Active call */
+		unsigned int		call_debug_id;	/* call->debug_id */
+		u32			call_id;	/* ID of current call */
+		u32			call_counter;	/* Call ID counter */
+		u32			last_call;	/* ID of last call */
+		u8			last_type;	/* Type of last packet */
+		union {
+			u32		last_seq;
+			u32		last_abort;
+		};
+	} channels[RXRPC_MAXCALLS];
+
+	struct timer_list	timer;		/* Conn event timer */
+	struct work_struct	processor;	/* connection event processor */
+	struct work_struct	destructor;	/* In-process-context destroyer */
+	struct rxrpc_bundle	*bundle;	/* Client connection bundle */
+	struct rb_node		service_node;	/* Node in peer->service_conns */
+	struct list_head	proc_link;	/* link in procfs list */
+	struct list_head	link;		/* link in master connection list */
+	struct sk_buff_head	rx_queue;	/* received conn-level packets */
+
+	struct mutex		security_lock;	/* Lock for security management */
+	const struct rxrpc_security *security;	/* applied security module */
+	union {
+		struct {
+			struct crypto_sync_skcipher *cipher;	/* encryption handle */
+			struct rxrpc_crypt csum_iv;	/* packet checksum base */
+			u32	nonce;		/* response re-use preventer */
+		} rxkad;
+	};
+	unsigned long		flags;
+	unsigned long		events;
+	unsigned long		idle_timestamp;	/* Time at which last became idle */
+	spinlock_t		state_lock;	/* state-change lock */
+	enum rxrpc_conn_proto_state state;	/* current state of connection */
+	enum rxrpc_call_completion completion;	/* Completion condition */
+	s32			abort_code;	/* Abort code of connection abort */
+	int			debug_id;	/* debug ID for printks */
+	atomic_t		serial;		/* packet serial number counter */
+	unsigned int		hi_serial;	/* highest serial number received */
+	u32			service_id;	/* Service ID, possibly upgraded */
+	u32			security_level;	/* Security level selected */
+	u8			security_ix;	/* security type */
+	u8			out_clientflag;	/* RXRPC_CLIENT_INITIATED if we are client */
+	u8			bundle_shift;	/* Index into bundle->avail_chans */
+	bool			exclusive;	/* T if conn is exclusive */
+	bool			upgrade;	/* T if service ID can be upgraded */
+	u16			orig_service_id; /* Originally requested service ID */
+	short			error;		/* Local error code */
+};
+
+static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
+{
+	return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
+}
+
+static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
+{
+	return !rxrpc_to_server(sp);
+}
+
+/*
+ * Flags in call->flags.
+ */
+enum rxrpc_call_flag {
+	RXRPC_CALL_RELEASED,		/* call has been released - no more message to userspace */
+	RXRPC_CALL_HAS_USERID,		/* has a user ID attached */
+	RXRPC_CALL_IS_SERVICE,		/* Call is service call */
+	RXRPC_CALL_EXPOSED,		/* The call was exposed to the world */
+	RXRPC_CALL_RX_LAST,		/* Received the last packet (at rxtx_top) */
+	RXRPC_CALL_TX_LAST,		/* Last packet in Tx buffer (at rxtx_top) */
+	RXRPC_CALL_TX_ALL_ACKED,	/* Last packet has been hard-acked */
+	RXRPC_CALL_SEND_PING,		/* A ping will need to be sent */
+	RXRPC_CALL_RETRANS_TIMEOUT,	/* Retransmission due to timeout occurred */
+	RXRPC_CALL_BEGAN_RX_TIMER,	/* We began the expect_rx_by timer */
+	RXRPC_CALL_RX_HEARD,		/* The peer responded at least once to this call */
+	RXRPC_CALL_DISCONNECTED,	/* The call has been disconnected */
+	RXRPC_CALL_KERNEL,		/* The call was made by the kernel */
+	RXRPC_CALL_UPGRADE,		/* Service upgrade was requested for the call */
+	RXRPC_CALL_EXCLUSIVE,		/* The call uses a once-only connection */
+	RXRPC_CALL_RX_IS_IDLE,		/* recvmsg() is idle - send an ACK */
+	RXRPC_CALL_RECVMSG_READ_ALL,	/* recvmsg() read all of the received data */
+};
+
+/*
+ * Events that can be raised on a call.
+ */
+enum rxrpc_call_event {
+	RXRPC_CALL_EV_ACK_LOST,		/* ACK may be lost, send ping */
+	RXRPC_CALL_EV_INITIAL_PING,	/* Send initial ping for a new service call */
+};
+
+/*
+ * The states that a call can be in.
+ */
+enum rxrpc_call_state {
+	RXRPC_CALL_UNINITIALISED,
+	RXRPC_CALL_CLIENT_AWAIT_CONN,	/* - client waiting for connection to become available */
+	RXRPC_CALL_CLIENT_SEND_REQUEST,	/* - client sending request phase */
+	RXRPC_CALL_CLIENT_AWAIT_REPLY,	/* - client awaiting reply */
+	RXRPC_CALL_CLIENT_RECV_REPLY,	/* - client receiving reply phase */
+	RXRPC_CALL_SERVER_PREALLOC,	/* - service preallocation */
+	RXRPC_CALL_SERVER_SECURING,	/* - server securing request connection */
+	RXRPC_CALL_SERVER_RECV_REQUEST,	/* - server receiving request */
+	RXRPC_CALL_SERVER_ACK_REQUEST,	/* - server pending ACK of request */
+	RXRPC_CALL_SERVER_SEND_REPLY,	/* - server sending reply */
+	RXRPC_CALL_SERVER_AWAIT_ACK,	/* - server awaiting final ACK */
+	RXRPC_CALL_COMPLETE,		/* - call complete */
+	NR__RXRPC_CALL_STATES
+};
+
+/*
+ * Call Tx congestion management modes.
+ */
+enum rxrpc_congest_mode {
+	RXRPC_CALL_SLOW_START,
+	RXRPC_CALL_CONGEST_AVOIDANCE,
+	RXRPC_CALL_PACKET_LOSS,
+	RXRPC_CALL_FAST_RETRANSMIT,
+	NR__RXRPC_CONGEST_MODES
+};
+
+/*
+ * RxRPC call definition
+ * - matched by { connection, call_id }
+ */
+struct rxrpc_call {
+	struct rcu_head		rcu;
+	struct rxrpc_connection	*conn;		/* connection carrying call */
+	struct rxrpc_bundle	*bundle;	/* Connection bundle to use */
+	struct rxrpc_peer	*peer;		/* Peer record for remote address */
+	struct rxrpc_local	*local;		/* Representation of local endpoint */
+	struct rxrpc_sock __rcu	*socket;	/* socket responsible */
+	struct rxrpc_net	*rxnet;		/* Network namespace to which call belongs */
+	struct key		*key;		/* Security details */
+	const struct rxrpc_security *security;	/* applied security module */
+	struct mutex		user_mutex;	/* User access mutex */
+	struct sockaddr_rxrpc	dest_srx;	/* Destination address */
+	unsigned long		delay_ack_at;	/* When DELAY ACK needs to happen */
+	unsigned long		ack_lost_at;	/* When ACK is figured as lost */
+	unsigned long		resend_at;	/* When next resend needs to happen */
+	unsigned long		ping_at;	/* When next to send a ping */
+	unsigned long		keepalive_at;	/* When next to send a keepalive ping */
+	unsigned long		expect_rx_by;	/* When we expect to get a packet by */
+	unsigned long		expect_req_by;	/* When we expect to get a request DATA packet by */
+	unsigned long		expect_term_by;	/* When we expect call termination by */
+	u32			next_rx_timo;	/* Timeout for next Rx packet (jif) */
+	u32			next_req_timo;	/* Timeout for next Rx request packet (jif) */
+	u32			hard_timo;	/* Maximum lifetime or 0 (jif) */
+	struct timer_list	timer;		/* Combined event timer */
+	struct work_struct	destroyer;	/* In-process-context destroyer */
+	rxrpc_notify_rx_t	notify_rx;	/* kernel service Rx notification function */
+	struct list_head	link;		/* link in master call list */
+	struct list_head	wait_link;	/* Link in local->new_client_calls */
+	struct hlist_node	error_link;	/* link in error distribution list */
+	struct list_head	accept_link;	/* Link in rx->acceptq */
+	struct list_head	recvmsg_link;	/* Link in rx->recvmsg_q */
+	struct list_head	sock_link;	/* Link in rx->sock_calls */
+	struct rb_node		sock_node;	/* Node in rx->calls */
+	struct list_head	attend_link;	/* Link in local->call_attend_q */
+	struct rxrpc_txbuf	*tx_pending;	/* Tx buffer being filled */
+	wait_queue_head_t	waitq;		/* Wait queue for channel or Tx */
+	s64			tx_total_len;	/* Total length left to be transmitted (or -1) */
+	unsigned long		user_call_ID;	/* user-defined call ID */
+	unsigned long		flags;
+	unsigned long		events;
+	spinlock_t		notify_lock;	/* Kernel notification lock */
+	unsigned int		send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */
+	s32			send_abort;	/* Abort code to be sent */
+	short			send_abort_err;	/* Error to be associated with the abort */
+	rxrpc_seq_t		send_abort_seq;	/* DATA packet that incurred the abort (or 0) */
+	s32			abort_code;	/* Local/remote abort code */
+	int			error;		/* Local error incurred */
+	enum rxrpc_call_state	_state;		/* Current state of call (needs barrier) */
+	enum rxrpc_call_completion completion;	/* Call completion condition */
+	refcount_t		ref;
+	u8			security_ix;	/* Security type */
+	enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */
+	u32			call_id;	/* call ID on connection  */
+	u32			cid;		/* connection ID plus channel index */
+	u32			security_level;	/* Security level selected */
+	int			debug_id;	/* debug ID for printks */
+	unsigned short		rx_pkt_offset;	/* Current recvmsg packet offset */
+	unsigned short		rx_pkt_len;	/* Current recvmsg packet len */
+
+	/* Transmitted data tracking. */
+	spinlock_t		tx_lock;	/* Transmit queue lock */
+	struct list_head	tx_sendmsg;	/* Sendmsg prepared packets */
+	struct list_head	tx_buffer;	/* Buffer of transmissible packets */
+	rxrpc_seq_t		tx_bottom;	/* First packet in buffer */
+	rxrpc_seq_t		tx_transmitted;	/* Highest packet transmitted */
+	rxrpc_seq_t		tx_prepared;	/* Highest Tx slot prepared. */
+	rxrpc_seq_t		tx_top;		/* Highest Tx slot allocated. */
+	u16			tx_backoff;	/* Delay to insert due to Tx failure */
+	u8			tx_winsize;	/* Maximum size of Tx window */
+#define RXRPC_TX_MAX_WINDOW	128
+	ktime_t			tx_last_sent;	/* Last time a transmission occurred */
+
+	/* Received data tracking */
+	struct sk_buff_head	recvmsg_queue;	/* Queue of packets ready for recvmsg() */
+	struct sk_buff_head	rx_oos_queue;	/* Queue of out of sequence packets */
+
+	rxrpc_seq_t		rx_highest_seq;	/* Higest sequence number received */
+	rxrpc_seq_t		rx_consumed;	/* Highest packet consumed */
+	rxrpc_serial_t		rx_serial;	/* Highest serial received for this call */
+	u8			rx_winsize;	/* Size of Rx window */
+
+	/* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
+	 * is fixed, we keep these numbers in terms of segments (ie. DATA
+	 * packets) rather than bytes.
+	 */
+#define RXRPC_TX_SMSS		RXRPC_JUMBO_DATALEN
+#define RXRPC_MIN_CWND		(RXRPC_TX_SMSS > 2190 ? 2 : RXRPC_TX_SMSS > 1095 ? 3 : 4)
+	u8			cong_cwnd;	/* Congestion window size */
+	u8			cong_extra;	/* Extra to send for congestion management */
+	u8			cong_ssthresh;	/* Slow-start threshold */
+	enum rxrpc_congest_mode	cong_mode:8;	/* Congestion management mode */
+	u8			cong_dup_acks;	/* Count of ACKs showing missing packets */
+	u8			cong_cumul_acks; /* Cumulative ACK count */
+	ktime_t			cong_tstamp;	/* Last time cwnd was changed */
+
+	/* Receive-phase ACK management (ACKs we send). */
+	u8			ackr_reason;	/* reason to ACK */
+	u16			ackr_sack_base;	/* Starting slot in SACK table ring */
+	rxrpc_serial_t		ackr_serial;	/* serial of packet being ACK'd */
+	rxrpc_seq_t		ackr_window;	/* Base of SACK window */
+	rxrpc_seq_t		ackr_wtop;	/* Base of SACK window */
+	unsigned int		ackr_nr_unacked; /* Number of unacked packets */
+	atomic_t		ackr_nr_consumed; /* Number of packets needing hard ACK */
+	struct {
+#define RXRPC_SACK_SIZE 256
+		 /* SACK table for soft-acked packets */
+		u8		ackr_sack_table[RXRPC_SACK_SIZE];
+	} __aligned(8);
+
+	/* RTT management */
+	rxrpc_serial_t		rtt_serial[4];	/* Serial number of DATA or PING sent */
+	ktime_t			rtt_sent_at[4];	/* Time packet sent */
+	unsigned long		rtt_avail;	/* Mask of available slots in bits 0-3,
+						 * Mask of pending samples in 8-11 */
+#define RXRPC_CALL_RTT_AVAIL_MASK	0xf
+#define RXRPC_CALL_RTT_PEND_SHIFT	8
+
+	/* Transmission-phase ACK management (ACKs we've received). */
+	ktime_t			acks_latest_ts;	/* Timestamp of latest ACK received */
+	rxrpc_seq_t		acks_first_seq;	/* first sequence number received */
+	rxrpc_seq_t		acks_prev_seq;	/* Highest previousPacket received */
+	rxrpc_seq_t		acks_hard_ack;	/* Latest hard-ack point */
+	rxrpc_seq_t		acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
+	rxrpc_serial_t		acks_highest_serial; /* Highest serial number ACK'd */
+};
+
+/*
+ * Summary of a new ACK and the changes it made to the Tx buffer packet states.
+ */
+struct rxrpc_ack_summary {
+	u16			nr_acks;		/* Number of ACKs in packet */
+	u16			nr_new_acks;		/* Number of new ACKs in packet */
+	u16			nr_rot_new_acks;	/* Number of rotated new ACKs */
+	u8			ack_reason;
+	bool			saw_nacks;		/* Saw NACKs in packet */
+	bool			new_low_nack;		/* T if new low NACK found */
+	bool			retrans_timeo;		/* T if reTx due to timeout happened */
+	u8			flight_size;		/* Number of unreceived transmissions */
+	/* Place to stash values for tracing */
+	enum rxrpc_congest_mode	mode:8;
+	u8			cwnd;
+	u8			ssthresh;
+	u8			dup_acks;
+	u8			cumulative_acks;
+};
+
+/*
+ * sendmsg() cmsg-specified parameters.
+ */
+enum rxrpc_command {
+	RXRPC_CMD_SEND_DATA,		/* send data message */
+	RXRPC_CMD_SEND_ABORT,		/* request abort generation */
+	RXRPC_CMD_REJECT_BUSY,		/* [server] reject a call as busy */
+	RXRPC_CMD_CHARGE_ACCEPT,	/* [server] charge accept preallocation */
+};
+
+struct rxrpc_call_params {
+	s64			tx_total_len;	/* Total Tx data length (if send data) */
+	unsigned long		user_call_ID;	/* User's call ID */
+	struct {
+		u32		hard;		/* Maximum lifetime (sec) */
+		u32		idle;		/* Max time since last data packet (msec) */
+		u32		normal;		/* Max time since last call packet (msec) */
+	} timeouts;
+	u8			nr_timeouts;	/* Number of timeouts specified */
+	bool			kernel;		/* T if kernel is making the call */
+	enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */
+};
+
+struct rxrpc_send_params {
+	struct rxrpc_call_params call;
+	u32			abort_code;	/* Abort code to Tx (if abort) */
+	enum rxrpc_command	command : 8;	/* The command to implement */
+	bool			exclusive;	/* Shared or exclusive call */
+	bool			upgrade;	/* If the connection is upgradeable */
+};
+
+/*
+ * Buffer of data to be output as a packet.
+ */
+struct rxrpc_txbuf {
+	struct rcu_head		rcu;
+	struct list_head	call_link;	/* Link in call->tx_sendmsg/tx_buffer */
+	struct list_head	tx_link;	/* Link in live Enc queue or Tx queue */
+	ktime_t			last_sent;	/* Time at which last transmitted */
+	refcount_t		ref;
+	rxrpc_seq_t		seq;		/* Sequence number of this packet */
+	unsigned int		call_debug_id;
+	unsigned int		debug_id;
+	unsigned int		len;		/* Amount of data in buffer */
+	unsigned int		space;		/* Remaining data space */
+	unsigned int		offset;		/* Offset of fill point */
+	unsigned long		flags;
+#define RXRPC_TXBUF_LAST	0		/* Set if last packet in Tx phase */
+#define RXRPC_TXBUF_RESENT	1		/* Set if has been resent */
+	u8 /*enum rxrpc_propose_ack_trace*/ ack_why;	/* If ack, why */
+	struct {
+		/* The packet for encrypting and DMA'ing.  We align it such
+		 * that data[] aligns correctly for any crypto blocksize.
+		 */
+		u8		pad[64 - sizeof(struct rxrpc_wire_header)];
+		struct rxrpc_wire_header wire;	/* Network-ready header */
+		union {
+			u8	data[RXRPC_JUMBO_DATALEN]; /* Data packet */
+			struct {
+				struct rxrpc_ackpacket ack;
+				DECLARE_FLEX_ARRAY(u8, acks);
+			};
+		};
+	} __aligned(64);
+};
+
+static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb)
+{
+	return txb->wire.flags & RXRPC_CLIENT_INITIATED;
+}
+
+static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb)
+{
+	return !rxrpc_sending_to_server(txb);
+}
+
+#include <trace/events/rxrpc.h>
+
+/*
+ * af_rxrpc.c
+ */
+extern atomic_t rxrpc_n_rx_skbs;
+extern struct workqueue_struct *rxrpc_workqueue;
+
+/*
+ * call_accept.c
+ */
+int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
+void rxrpc_discard_prealloc(struct rxrpc_sock *);
+bool rxrpc_new_incoming_call(struct rxrpc_local *local,
+			     struct rxrpc_peer *peer,
+			     struct rxrpc_connection *conn,
+			     struct sockaddr_rxrpc *peer_srx,
+			     struct sk_buff *skb);
+void rxrpc_accept_incoming_calls(struct rxrpc_local *);
+int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long);
+
+/*
+ * call_event.c
+ */
+void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial,
+			enum rxrpc_propose_ack_trace why);
+void rxrpc_send_ACK(struct rxrpc_call *, u8, rxrpc_serial_t, enum rxrpc_propose_ack_trace);
+void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t,
+			     enum rxrpc_propose_ack_trace);
+void rxrpc_shrink_call_tx_buffer(struct rxrpc_call *);
+void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb);
+
+void rxrpc_reduce_call_timer(struct rxrpc_call *call,
+			     unsigned long expire_at,
+			     unsigned long now,
+			     enum rxrpc_timer_trace why);
+
+bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb);
+
+/*
+ * call_object.c
+ */
+extern const char *const rxrpc_call_states[];
+extern const char *const rxrpc_call_completions[];
+extern struct kmem_cache *rxrpc_call_jar;
+
+void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what);
+struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
+struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
+struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
+					 struct rxrpc_conn_parameters *,
+					 struct sockaddr_rxrpc *,
+					 struct rxrpc_call_params *, gfp_t,
+					 unsigned int);
+void rxrpc_start_call_timer(struct rxrpc_call *call);
+void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
+			 struct sk_buff *);
+void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
+void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
+void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace);
+struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
+void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
+void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
+void rxrpc_cleanup_call(struct rxrpc_call *);
+void rxrpc_destroy_all_calls(struct rxrpc_net *);
+
+static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
+{
+	return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
+}
+
+static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
+{
+	return !rxrpc_is_service_call(call);
+}
+
+/*
+ * call_state.c
+ */
+bool rxrpc_set_call_completion(struct rxrpc_call *call,
+			       enum rxrpc_call_completion compl,
+			       u32 abort_code,
+			       int error);
+bool rxrpc_call_completed(struct rxrpc_call *call);
+bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
+		      u32 abort_code, int error, enum rxrpc_abort_reason why);
+void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl,
+			int error);
+
+static inline void rxrpc_set_call_state(struct rxrpc_call *call,
+					enum rxrpc_call_state state)
+{
+	/* Order write of completion info before write of ->state. */
+	smp_store_release(&call->_state, state);
+	wake_up(&call->waitq);
+}
+
+static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call)
+{
+	return call->_state; /* Only inside I/O thread */
+}
+
+static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call)
+{
+	return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
+}
+
+static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call)
+{
+	/* Order read ->state before read of completion info. */
+	return smp_load_acquire(&call->_state);
+}
+
+static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call)
+{
+	return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
+}
+
+static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call)
+{
+	return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED;
+}
+
+/*
+ * conn_client.c
+ */
+extern unsigned int rxrpc_reap_client_connections;
+extern unsigned long rxrpc_conn_idle_client_expiry;
+extern unsigned long rxrpc_conn_idle_client_fast_expiry;
+
+void rxrpc_purge_client_connections(struct rxrpc_local *local);
+struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
+void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
+int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp);
+void rxrpc_connect_client_calls(struct rxrpc_local *local);
+void rxrpc_expose_client_call(struct rxrpc_call *);
+void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *);
+void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle);
+void rxrpc_put_client_conn(struct rxrpc_connection *, enum rxrpc_conn_trace);
+void rxrpc_discard_expired_client_conns(struct rxrpc_local *local);
+void rxrpc_clean_up_local_conns(struct rxrpc_local *);
+
+/*
+ * conn_event.c
+ */
+void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb,
+				unsigned int channel);
+int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb,
+		     s32 abort_code, int err, enum rxrpc_abort_reason why);
+void rxrpc_process_connection(struct work_struct *);
+void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool);
+bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb);
+void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb);
+
+static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn)
+{
+	/* Order reading the abort info after the state check. */
+	return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED;
+}
+
+/*
+ * conn_object.c
+ */
+extern unsigned int rxrpc_connection_expiry;
+extern unsigned int rxrpc_closed_conn_expiry;
+
+void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why);
+struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t);
+struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *,
+							  struct sockaddr_rxrpc *,
+							  struct sk_buff *);
+void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
+void rxrpc_disconnect_call(struct rxrpc_call *);
+void rxrpc_kill_client_conn(struct rxrpc_connection *);
+void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace);
+void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
+struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *,
+					      enum rxrpc_conn_trace);
+struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *,
+						    enum rxrpc_conn_trace);
+void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
+void rxrpc_service_connection_reaper(struct work_struct *);
+void rxrpc_destroy_all_connections(struct rxrpc_net *);
+
+static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
+{
+	return conn->out_clientflag;
+}
+
+static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
+{
+	return !rxrpc_conn_is_client(conn);
+}
+
+static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
+					   unsigned long expire_at)
+{
+	timer_reduce(&conn->timer, expire_at);
+}
+
+/*
+ * conn_service.c
+ */
+struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
+						     struct sk_buff *);
+struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
+void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *,
+				   const struct rxrpc_security *, struct sk_buff *);
+void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
+
+/*
+ * input.c
+ */
+void rxrpc_congestion_degrade(struct rxrpc_call *);
+void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *);
+void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *);
+
+/*
+ * io_thread.c
+ */
+int rxrpc_encap_rcv(struct sock *, struct sk_buff *);
+void rxrpc_error_report(struct sock *);
+bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why,
+			s32 abort_code, int err);
+int rxrpc_io_thread(void *data);
+static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local)
+{
+	wake_up_process(local->io_thread);
+}
+
+static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why)
+{
+	return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO);
+}
+
+/*
+ * insecure.c
+ */
+extern const struct rxrpc_security rxrpc_no_security;
+
+/*
+ * key.c
+ */
+extern struct key_type key_type_rxrpc;
+
+int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int);
+int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
+			      u32);
+
+/*
+ * local_event.c
+ */
+void rxrpc_gen_version_string(void);
+void rxrpc_send_version_request(struct rxrpc_local *local,
+				struct rxrpc_host_header *hdr,
+				struct sk_buff *skb);
+
+/*
+ * local_object.c
+ */
+void rxrpc_local_dont_fragment(const struct rxrpc_local *local, bool set);
+struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
+struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace);
+struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace);
+void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace);
+struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace);
+void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace);
+void rxrpc_destroy_local(struct rxrpc_local *local);
+void rxrpc_destroy_all_locals(struct rxrpc_net *);
+
+static inline bool __rxrpc_use_local(struct rxrpc_local *local,
+				     enum rxrpc_local_trace why)
+{
+	int r, u;
+
+	r = refcount_read(&local->ref);
+	u = atomic_fetch_add_unless(&local->active_users, 1, 0);
+	trace_rxrpc_local(local->debug_id, why, r, u);
+	return u != 0;
+}
+
+static inline void rxrpc_see_local(struct rxrpc_local *local,
+				   enum rxrpc_local_trace why)
+{
+	int r, u;
+
+	r = refcount_read(&local->ref);
+	u = atomic_read(&local->active_users);
+	trace_rxrpc_local(local->debug_id, why, r, u);
+}
+
+/*
+ * misc.c
+ */
+extern unsigned int rxrpc_max_backlog __read_mostly;
+extern unsigned long rxrpc_soft_ack_delay;
+extern unsigned long rxrpc_idle_ack_delay;
+extern unsigned int rxrpc_rx_window_size;
+extern unsigned int rxrpc_rx_mtu;
+extern unsigned int rxrpc_rx_jumbo_max;
+#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
+extern unsigned long rxrpc_inject_rx_delay;
+#endif
+
+/*
+ * net_ns.c
+ */
+extern unsigned int rxrpc_net_id;
+extern struct pernet_operations rxrpc_net_ops;
+
+static inline struct rxrpc_net *rxrpc_net(struct net *net)
+{
+	return net_generic(net, rxrpc_net_id);
+}
+
+/*
+ * output.c
+ */
+int rxrpc_send_ack_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb);
+int rxrpc_send_abort_packet(struct rxrpc_call *);
+int rxrpc_send_data_packet(struct rxrpc_call *, struct rxrpc_txbuf *);
+void rxrpc_send_conn_abort(struct rxrpc_connection *conn);
+void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb);
+void rxrpc_send_keepalive(struct rxrpc_peer *);
+void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb);
+
+/*
+ * peer_event.c
+ */
+void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *);
+void rxrpc_peer_keepalive_worker(struct work_struct *);
+
+/*
+ * peer_object.c
+ */
+struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
+					 const struct sockaddr_rxrpc *);
+struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local,
+				     struct sockaddr_rxrpc *srx, gfp_t gfp);
+struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t,
+				    enum rxrpc_peer_trace);
+void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer);
+void rxrpc_destroy_all_peers(struct rxrpc_net *);
+struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
+struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace);
+void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
+
+/*
+ * proc.c
+ */
+extern const struct seq_operations rxrpc_call_seq_ops;
+extern const struct seq_operations rxrpc_connection_seq_ops;
+extern const struct seq_operations rxrpc_peer_seq_ops;
+extern const struct seq_operations rxrpc_local_seq_ops;
+
+/*
+ * recvmsg.c
+ */
+void rxrpc_notify_socket(struct rxrpc_call *);
+int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
+
+/*
+ * Abort a call due to a protocol error.
+ */
+static inline int rxrpc_abort_eproto(struct rxrpc_call *call,
+				     struct sk_buff *skb,
+				     s32 abort_code,
+				     enum rxrpc_abort_reason why)
+{
+	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+
+	rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why);
+	return -EPROTO;
+}
+
+/*
+ * rtt.c
+ */
+void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, int,
+			rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
+unsigned long rxrpc_get_rto_backoff(struct rxrpc_peer *, bool);
+void rxrpc_peer_init_rtt(struct rxrpc_peer *);
+
+/*
+ * rxkad.c
+ */
+#ifdef CONFIG_RXKAD
+extern const struct rxrpc_security rxkad;
+#endif
+
+/*
+ * security.c
+ */
+int __init rxrpc_init_security(void);
+const struct rxrpc_security *rxrpc_security_lookup(u8);
+void rxrpc_exit_security(void);
+int rxrpc_init_client_call_security(struct rxrpc_call *);
+int rxrpc_init_client_conn_security(struct rxrpc_connection *);
+const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *,
+							 struct sk_buff *);
+struct key *rxrpc_look_up_server_security(struct rxrpc_connection *,
+					  struct sk_buff *, u32, u32);
+
+/*
+ * sendmsg.c
+ */
+bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error,
+			 enum rxrpc_abort_reason why);
+int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
+
+/*
+ * server_key.c
+ */
+extern struct key_type key_type_rxrpc_s;
+
+int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int);
+
+/*
+ * skbuff.c
+ */
+void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
+void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
+void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
+void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace);
+void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
+void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
+void rxrpc_purge_queue(struct sk_buff_head *);
+
+/*
+ * stats.c
+ */
+int rxrpc_stats_show(struct seq_file *seq, void *v);
+int rxrpc_stats_clear(struct file *file, char *buf, size_t size);
+
+#define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s)
+#define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s)
+
+/*
+ * sysctl.c
+ */
+#ifdef CONFIG_SYSCTL
+extern int __init rxrpc_sysctl_init(void);
+extern void rxrpc_sysctl_exit(void);
+#else
+static inline int __init rxrpc_sysctl_init(void) { return 0; }
+static inline void rxrpc_sysctl_exit(void) {}
+#endif
+
+/*
+ * txbuf.c
+ */
+extern atomic_t rxrpc_nr_txbuf;
+struct rxrpc_txbuf *rxrpc_alloc_txbuf(struct rxrpc_call *call, u8 packet_type,
+				      gfp_t gfp);
+void rxrpc_get_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
+void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
+void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
+
+/*
+ * utils.c
+ */
+int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
+
+static inline bool before(u32 seq1, u32 seq2)
+{
+        return (s32)(seq1 - seq2) < 0;
+}
+static inline bool before_eq(u32 seq1, u32 seq2)
+{
+        return (s32)(seq1 - seq2) <= 0;
+}
+static inline bool after(u32 seq1, u32 seq2)
+{
+        return (s32)(seq1 - seq2) > 0;
+}
+static inline bool after_eq(u32 seq1, u32 seq2)
+{
+        return (s32)(seq1 - seq2) >= 0;
+}
+
+/*
+ * debug tracing
+ */
+extern unsigned int rxrpc_debug;
+
+#define dbgprintk(FMT,...) \
+	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
+
+#define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
+#define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
+#define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)
+
+
+#if defined(__KDEBUG)
+#define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
+#define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
+#define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)
+
+#elif defined(CONFIG_AF_RXRPC_DEBUG)
+#define RXRPC_DEBUG_KENTER	0x01
+#define RXRPC_DEBUG_KLEAVE	0x02
+#define RXRPC_DEBUG_KDEBUG	0x04
+
+#define _enter(FMT,...)					\
+do {							\
+	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER))	\
+		kenter(FMT,##__VA_ARGS__);		\
+} while (0)
+
+#define _leave(FMT,...)					\
+do {							\
+	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE))	\
+		kleave(FMT,##__VA_ARGS__);		\
+} while (0)
+
+#define _debug(FMT,...)					\
+do {							\
+	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG))	\
+		kdebug(FMT,##__VA_ARGS__);		\
+} while (0)
+
+#else
+#define _enter(FMT,...)	no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
+#define _leave(FMT,...)	no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
+#define _debug(FMT,...)	no_printk("    "FMT ,##__VA_ARGS__)
+#endif
+
+/*
+ * debug assertion checking
+ */
+#if 1 // defined(__KDEBUGALL)
+
+#define ASSERT(X)						\
+do {								\
+	if (unlikely(!(X))) {					\
+		pr_err("Assertion failed\n");			\
+		BUG();						\
+	}							\
+} while (0)
+
+#define ASSERTCMP(X, OP, Y)						\
+do {									\
+	__typeof__(X) _x = (X);						\
+	__typeof__(Y) _y = (__typeof__(X))(Y);				\
+	if (unlikely(!(_x OP _y))) {					\
+		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
+		       (unsigned long)_x, (unsigned long)_x, #OP,	\
+		       (unsigned long)_y, (unsigned long)_y);		\
+		BUG();							\
+	}								\
+} while (0)
+
+#define ASSERTIF(C, X)						\
+do {								\
+	if (unlikely((C) && !(X))) {				\
+		pr_err("Assertion failed\n");			\
+		BUG();						\
+	}							\
+} while (0)
+
+#define ASSERTIFCMP(C, X, OP, Y)					\
+do {									\
+	__typeof__(X) _x = (X);						\
+	__typeof__(Y) _y = (__typeof__(X))(Y);				\
+	if (unlikely((C) && !(_x OP _y))) {				\
+		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
+		       (unsigned long)_x, (unsigned long)_x, #OP,	\
+		       (unsigned long)_y, (unsigned long)_y);		\
+		BUG();							\
+	}								\
+} while (0)
+
+#else
+
+#define ASSERT(X)				\
+do {						\
+} while (0)
+
+#define ASSERTCMP(X, OP, Y)			\
+do {						\
+} while (0)
+
+#define ASSERTIF(C, X)				\
+do {						\
+} while (0)
+
+#define ASSERTIFCMP(C, X, OP, Y)		\
+do {						\
+} while (0)
+
+#endif /* __KDEBUGALL */