cregit-Linux how code gets into the kernel

Release 4.11 net/rxrpc/ar-internal.h

Directory: net/rxrpc
/* AF_RXRPC internal definitions
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/atomic.h>
#include <linux/seqlock.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
#include <rxrpc/packet.h>

#if 0
#define CHECK_SLAB_OKAY(X)				     \
	BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
               (POISON_FREE << 8 | POISON_FREE))
#else

#define CHECK_SLAB_OKAY(X) do {} while (0)
#endif


#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 rxrpc_connection;

/*
 * Mark applied to socket buffers.
 */

enum rxrpc_skb_mark {
	
RXRPC_SKB_MARK_DATA,		/* data message */
	
RXRPC_SKB_MARK_FINAL_ACK,	/* final ACK received message */
	
RXRPC_SKB_MARK_BUSY,		/* server busy message */
	
RXRPC_SKB_MARK_REMOTE_ABORT,	/* remote abort message */
	
RXRPC_SKB_MARK_LOCAL_ABORT,	/* local abort message */
	
RXRPC_SKB_MARK_NET_ERROR,	/* network error message */
	
RXRPC_SKB_MARK_LOCAL_ERROR,	/* local error message */
	
RXRPC_SKB_MARK_NEW_CALL,	/* local error message */
};

/*
 * 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_LISTENING,		/* server listening for connections */
	
RXRPC_SERVER_LISTEN_DISABLED,	/* server listening disabled */
	
RXRPC_CLOSE,			/* socket is being closed */
};

/*
 * 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  */
	
rwlock_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 */
	
sa_family_t		family;		/* Protocol family created with */
	
struct sockaddr_rxrpc	srx;		/* local address */
	
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 {
	union {
		
u8		nr_jumbo;	/* Number of jumbo subpackets */
	};
	union {
		
int		remain;		/* amount of space remaining for next write */
	};

	
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 */

	/* Initialise a security service */
	
int (*init)(void);

	/* Clean up a security service */
	
void (*exit)(void);

	/* initialise a connection's security */
	
int (*init_connection_security)(struct rxrpc_connection *);

	/* prime a connection's packet security */
	
int (*prime_packet_security)(struct rxrpc_connection *);

	/* impose security on a packet */
	
int (*secure_packet)(struct rxrpc_call *,
			     struct sk_buff *,
			     size_t,
			     void *);

	/* verify the security on a received packet */
	
int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
			     unsigned int, unsigned int, rxrpc_seq_t, u16);

	/* Locate the data in a received packet that has been verified. */
	
void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
			    unsigned int *, unsigned int *);

	/* issue a challenge */
	
int (*issue_challenge)(struct rxrpc_connection *);

	/* respond to a challenge */
	
int (*respond_to_challenge)(struct rxrpc_connection *,
				    struct sk_buff *,
				    u32 *);

	/* verify a response */
	
int (*verify_response)(struct rxrpc_connection *,
			       struct sk_buff *,
			       u32 *);

	/* 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		usage;
	
struct list_head	link;
	
struct socket		*socket;	/* my UDP socket */
	
struct work_struct	processor;
	
struct rxrpc_sock __rcu	*service;	/* Service(s) listening on this endpoint */
	
struct rw_semaphore	defrag_sem;	/* control re-enablement of IP DF bit */
	
struct sk_buff_head	reject_queue;	/* packets awaiting rejection */
	
struct sk_buff_head	event_queue;	/* endpoint event packets awaiting processing */
	
struct rb_root		client_conns;	/* Client connections by socket params */
	
spinlock_t		client_conns_lock; /* Lock for client_conns */
	
spinlock_t		lock;		/* access lock */
	
rwlock_t		services_lock;	/* lock for services list */
	
int			debug_id;	/* debug ID for printks */
	
bool			dead;
	
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 */
	
atomic_t		usage;
	
unsigned long		hash_key;
	
struct hlist_node	hash_link;
	
struct rxrpc_local	*local;
	
struct hlist_head	error_targets;	/* targets for net error distribution */
	
struct work_struct	error_distributor;
	
struct rb_root		service_conns;	/* Service connections */
	
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 */
	
int			error_report;	/* Net (+0) or local (+1000000) to distribute */

#define RXRPC_LOCAL_ERROR_OFFSET 1000000
	
struct sockaddr_rxrpc	srx;		/* remote address */

	/* calculated RTT cache */

#define RXRPC_RTT_CACHE_SIZE 32
	
ktime_t			rtt_last_req;	/* Time of last RTT request */
	
u64			rtt;		/* Current RTT estimate (in nS) */
	
u64			rtt_sum;	/* Sum of cache contents */
	
u64			rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */
	
u8			rtt_cursor;	/* next entry at which to insert */
	
u8			rtt_usage;	/* amount of cache actually used */
};

/*
 * 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 rxrpc_peer	*peer;		/* Remote endpoint */
	
struct key		*key;		/* Security details */
	
bool			exclusive;	/* T if conn is exclusive */
	
u16			service_id;	/* Service ID for this connection */
	
u32			security_level;	/* Security level selected */
};

/*
 * Bits in the connection flags.
 */

enum rxrpc_conn_flag {
	
RXRPC_CONN_HAS_IDR,		/* Has a client conn ID assigned */
	
RXRPC_CONN_IN_SERVICE_CONNS,	/* Conn is in peer->service_conns */
	
RXRPC_CONN_IN_CLIENT_CONNS,	/* Conn is in local->client_conns */
	
RXRPC_CONN_EXPOSED,		/* Conn has extra ref for exposure */
	
RXRPC_CONN_DONT_REUSE,		/* Don't reuse this connection */
	
RXRPC_CONN_COUNTED,		/* Counted by rxrpc_nr_client_conns */
};

/*
 * Events that can be raised upon a connection.
 */

enum rxrpc_conn_event {
	
RXRPC_CONN_EV_CHALLENGE,	/* Send challenge packet */
};

/*
 * The connection cache state.
 */

enum rxrpc_conn_cache_state {
	
RXRPC_CONN_CLIENT_INACTIVE,	/* Conn is not yet listed */
	
RXRPC_CONN_CLIENT_WAITING,	/* Conn is on wait list, waiting for capacity */
	
RXRPC_CONN_CLIENT_ACTIVE,	/* Conn is on active list, doing calls */
	
RXRPC_CONN_CLIENT_CULLED,	/* Conn is culled and delisted, doing calls */
	
RXRPC_CONN_CLIENT_IDLE,		/* Conn is on idle list, doing mostly nothing */
	
RXRPC_CONN__NR_CACHE_STATES
};

/*
 * The connection protocol state.
 */

enum rxrpc_conn_proto_state {
	
RXRPC_CONN_UNUSED,		/* Connection not yet attempted */
	
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_REMOTELY_ABORTED,	/* Conn aborted by peer */
	
RXRPC_CONN_LOCALLY_ABORTED,	/* Conn aborted locally */
	
RXRPC_CONN__NR_STATES
};

/*
 * 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_conn_parameters params;

	
atomic_t		usage;
	
struct rcu_head		rcu;
	
struct list_head	cache_link;

	
spinlock_t		channel_lock;
	
unsigned char		active_chans;	/* Mask of active channels */

#define RXRPC_ACTIVE_CHANS_MASK	((1 << RXRPC_MAXCALLS) - 1)
	
struct list_head	waiting_calls;	/* Calls waiting for channels */
	
struct rxrpc_channel {
		
struct rxrpc_call __rcu	*call;		/* Active call */
		
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 */
		
u16			last_service_id;
		union {
			
u32		last_seq;
			
u32		last_abort;
		};
	} 
channels[RXRPC_MAXCALLS];

	
struct work_struct	processor;	/* connection event processor */
	union {
		
struct rb_node	client_node;	/* Node in local->client_conns */
		
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 */
	
const struct rxrpc_security *security;	/* applied security module */
	
struct key		*server_key;	/* security for this service */
	
struct crypto_skcipher	*cipher;	/* encryption handle */
	
struct rxrpc_crypt	csum_iv;	/* packet checksum base */
	
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_cache_state cache_state;
	
enum rxrpc_conn_proto_state state;	/* current state of connection */
	
u32			local_abort;	/* local abort code */
	
u32			remote_abort;	/* remote abort code */
	
int			debug_id;	/* debug ID for printks */
	
atomic_t		serial;		/* packet serial number counter */
	
unsigned int		hi_serial;	/* highest serial number received */
	
u32			security_nonce;	/* response re-use preventer */
	
u8			size_align;	/* data size alignment (for security) */
	
u8			security_size;	/* security header size */
	
u8			security_ix;	/* security type */
	
u8			out_clientflag;	/* RXRPC_CLIENT_INITIATED if we are client */
};

/*
 * 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_SEND_PING,		/* A ping will need to be sent */
	
RXRPC_CALL_PINGING,		/* Ping in process */
	
RXRPC_CALL_RETRANS_TIMEOUT,	/* Retransmission due to timeout occurred */
};

/*
 * Events that can be raised on a call.
 */

enum rxrpc_call_event {
	
RXRPC_CALL_EV_ACK,		/* need to generate ACK */
	
RXRPC_CALL_EV_ABORT,		/* need to generate abort */
	
RXRPC_CALL_EV_TIMER,		/* Timer expired */
	
RXRPC_CALL_EV_RESEND,		/* Tx resend required */
	
RXRPC_CALL_EV_PING,		/* Ping send required */
};

/*
 * 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_ACCEPTING,	/* - server accepting request */
	
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 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
};

/*
 * 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_peer	*peer;		/* Peer record for remote address */
	
struct rxrpc_sock __rcu	*socket;	/* socket responsible */
	
struct mutex		user_mutex;	/* User access mutex */
	
ktime_t			ack_at;		/* When deferred ACK needs to happen */
	
ktime_t			resend_at;	/* When next resend needs to happen */
	
ktime_t			ping_at;	/* When next to send a ping */
	
ktime_t			expire_at;	/* When the call times out */
	
struct timer_list	timer;		/* Combined event timer */
	
struct work_struct	processor;	/* Event processor */
	
rxrpc_notify_rx_t	notify_rx;	/* kernel service Rx notification function */
	
struct list_head	link;		/* link in master call list */
	
struct list_head	chan_wait_link;	/* Link in conn->waiting_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 sk_buff		*tx_pending;	/* Tx socket buffer being filled */
	
wait_queue_head_t	waitq;		/* Wait queue for channel or Tx */
	
__be32			crypto_buf[2];	/* Temporary packet crypto buffer */
	
unsigned long		user_call_ID;	/* user-defined call ID */
	
unsigned long		flags;
	
unsigned long		events;
	
spinlock_t		lock;
	
rwlock_t		state_lock;	/* lock for state transition */
	
u32			abort_code;	/* Local/remote abort code */
	
int			error;		/* Local error incurred */
	
enum rxrpc_call_state	state;		/* current state of call */
	
enum rxrpc_call_completion completion;	/* Call completion condition */
	
atomic_t		usage;
	
u16			service_id;	/* service ID */
	
u8			security_ix;	/* Security type */
	
u32			call_id;	/* call ID on connection  */
	
u32			cid;		/* connection ID plus channel index */
	
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 */

	/* Rx/Tx circular buffer, depending on phase.
         *
         * In the Rx phase, packets are annotated with 0 or the number of the
         * segment of a jumbo packet each buffer refers to.  There can be up to
         * 47 segments in a maximum-size UDP packet.
         *
         * In the Tx phase, packets are annotated with which buffers have been
         * acked.
         */

#define RXRPC_RXTX_BUFF_SIZE	64

#define RXRPC_RXTX_BUFF_MASK	(RXRPC_RXTX_BUFF_SIZE - 1)

#define RXRPC_INIT_RX_WINDOW_SIZE 32
	
struct sk_buff		**rxtx_buffer;
	
u8			*rxtx_annotations;

#define RXRPC_TX_ANNO_ACK	0

#define RXRPC_TX_ANNO_UNACK	1

#define RXRPC_TX_ANNO_NAK	2

#define RXRPC_TX_ANNO_RETRANS	3

#define RXRPC_TX_ANNO_MASK	0x03

#define RXRPC_TX_ANNO_LAST	0x04

#define RXRPC_TX_ANNO_RESENT	0x08


#define RXRPC_RX_ANNO_JUMBO	0x3f		/* Jumbo subpacket number + 1 if not zero */

#define RXRPC_RX_ANNO_JLAST	0x40		/* Set if last element of a jumbo packet */

#define RXRPC_RX_ANNO_VERIFIED	0x80		/* Set if verified and decrypted */
	
rxrpc_seq_t		tx_hard_ack;	/* Dead slot in buffer; the first transmitted but
                                                 * not hard-ACK'd packet follows this.
                                                 */
	
rxrpc_seq_t		tx_top;		/* Highest Tx slot allocated. */

	/* 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
	
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 */

	
rxrpc_seq_t		rx_hard_ack;	/* Dead slot in buffer; the first received but not
                                                 * consumed packet follows this.
                                                 */
	
rxrpc_seq_t		rx_top;		/* Highest Rx slot allocated. */
	
rxrpc_seq_t		rx_expect_next;	/* Expected next packet sequence number */
	
u8			rx_winsize;	/* Size of Rx window */
	
u8			tx_winsize;	/* Maximum size of Tx window */
	
bool			tx_phase;	/* T if transmission phase, F if receive phase */
	
u8			nr_jumbo_bad;	/* Number of jumbo dups/exceeds-windows */

	/* receive-phase ACK management */
	
u8			ackr_reason;	/* reason to ACK */
	
u16			ackr_skew;	/* skew on packet being ACK'd */
	
rxrpc_serial_t		ackr_serial;	/* serial of packet being ACK'd */
	
rxrpc_seq_t		ackr_prev_seq;	/* previous sequence number received */
	
rxrpc_seq_t		ackr_consumed;	/* Highest packet shown consumed */
	
rxrpc_seq_t		ackr_seen;	/* Highest packet shown seen */

	/* ping management */
	
rxrpc_serial_t		ping_serial;	/* Last ping sent */
	
ktime_t			ping_time;	/* Time last ping sent */

	/* transmission-phase ACK management */
	
ktime_t			acks_latest_ts;	/* Timestamp of latest ACK received */
	
rxrpc_serial_t		acks_latest;	/* serial number of latest ACK received */
	
rxrpc_seq_t		acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
};

/*
 * Summary of a new ACK and the changes it made to the Tx buffer packet states.
 */

struct rxrpc_ack_summary {
	
u8			ack_reason;
	
u8			nr_acks;		/* Number of ACKs in packet */
	
u8			nr_nacks;		/* Number of NACKs in packet */
	
u8			nr_new_acks;		/* Number of new ACKs in packet */
	
u8			nr_new_nacks;		/* Number of new NACKs in packet */
	
u8			nr_rot_new_acks;	/* Number of rotated new ACKs */
	
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;
};

#include <trace/events/rxrpc.h>

/*
 * af_rxrpc.c
 */
extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
extern u32 rxrpc_epoch;
extern atomic_t rxrpc_debug_id;
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 *);
struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
					   struct rxrpc_connection *,
					   struct sk_buff *);
void rxrpc_accept_incoming_calls(struct rxrpc_local *);
struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
				     rxrpc_notify_rx_t);
int rxrpc_reject_call(struct rxrpc_sock *);

/*
 * call_event.c
 */
void __rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t);
void rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t);
void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
		       enum rxrpc_propose_ack_trace);
void rxrpc_process_call(struct work_struct *);

/*
 * call_object.c
 */
extern const char *const rxrpc_call_states[];
extern const char *const rxrpc_call_completions[];
extern unsigned int rxrpc_max_call_lifetime;
extern struct kmem_cache *rxrpc_call_jar;
extern struct list_head rxrpc_calls;
extern rwlock_t rxrpc_call_lock;

struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
struct rxrpc_call *rxrpc_alloc_call(gfp_t);
struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
					 struct rxrpc_conn_parameters *,
					 struct sockaddr_rxrpc *,
					 unsigned long, gfp_t);
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 *);
bool __rxrpc_queue_call(struct rxrpc_call *);
bool rxrpc_queue_call(struct rxrpc_call *);
void rxrpc_see_call(struct rxrpc_call *);
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 __exit rxrpc_destroy_all_calls(void);


static inline bool rxrpc_is_service_call(const struct rxrpc_call *call) { return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags); }

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static inline bool rxrpc_is_client_call(const struct rxrpc_call *call) { return !rxrpc_is_service_call(call); }

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/* * Transition a call to the complete state. */
static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call, enum rxrpc_call_completion compl, u32 abort_code, int error) { if (call->state < RXRPC_CALL_COMPLETE) { call->abort_code = abort_code; call->error = error; call->completion = compl, call->state = RXRPC_CALL_COMPLETE; wake_up(&call->waitq); return true; } return false; }

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static inline bool rxrpc_set_call_completion(struct rxrpc_call *call, enum rxrpc_call_completion compl, u32 abort_code, int error) { bool ret; write_lock_bh(&call->state_lock); ret = __rxrpc_set_call_completion(call, compl, abort_code, error); write_unlock_bh(&call->state_lock); return ret; }

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/* * Record that a call successfully completed. */
static inline bool __rxrpc_call_completed(struct rxrpc_call *call) { return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0); }

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static inline bool rxrpc_call_completed(struct rxrpc_call *call) { bool ret; write_lock_bh(&call->state_lock); ret = __rxrpc_call_completed(call); write_unlock_bh(&call->state_lock); return ret; }

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/* * Record that a call is locally aborted. */
static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call, rxrpc_seq_t seq, u32 abort_code, int error) { trace_rxrpc_abort(why, call->cid, call->call_id, seq, abort_code, error); return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error); }

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static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call, rxrpc_seq_t seq, u32 abort_code, int error) { bool ret; write_lock_bh(&call->state_lock); ret = __rxrpc_abort_call(why, call, seq, abort_code, error); write_unlock_bh(&call->state_lock); return ret; }

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/* * conn_client.c */ extern unsigned int rxrpc_max_client_connections; extern unsigned int rxrpc_reap_client_connections; extern unsigned int rxrpc_conn_idle_client_expiry; extern unsigned int rxrpc_conn_idle_client_fast_expiry; extern struct idr rxrpc_client_conn_ids; void rxrpc_destroy_client_conn_ids(void); int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *, struct sockaddr_rxrpc *, gfp_t); void rxrpc_expose_client_call(struct rxrpc_call *); void rxrpc_disconnect_client_call(struct rxrpc_call *); void rxrpc_put_client_conn(struct rxrpc_connection *); void __exit rxrpc_destroy_all_client_connections(void); /* * conn_event.c */ void rxrpc_process_connection(struct work_struct *); /* * conn_object.c */ extern unsigned int rxrpc_connection_expiry; extern struct list_head rxrpc_connections; extern struct list_head rxrpc_connection_proc_list; extern rwlock_t rxrpc_connection_lock; int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *); struct rxrpc_connection *rxrpc_alloc_connection(gfp_t); struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *, struct sk_buff *); void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *); void rxrpc_disconnect_call(struct rxrpc_call *); void rxrpc_kill_connection(struct rxrpc_connection *); bool rxrpc_queue_conn(struct rxrpc_connection *); void rxrpc_see_connection(struct rxrpc_connection *); void rxrpc_get_connection(struct rxrpc_connection *); struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *); void rxrpc_put_service_conn(struct rxrpc_connection *); void __exit rxrpc_destroy_all_connections(void);
static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn) { return