net/rxrpc/ar-internal.h

   1 /* AF_RXRPC internal definitions
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/atomic.h>
  13 #include <linux/seqlock.h>
  14 #include <net/net_namespace.h>
  15 #include <net/netns/generic.h>
  16 #include <net/sock.h>
  17 #include <net/af_rxrpc.h>
  18 #include <rxrpc/packet.h>
  19
  20 #if 0
  21 #define CHECK_SLAB_OKAY(X)                                   \
  22         BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
  23                (POISON_FREE << 8 | POISON_FREE))
  24 #else
  25 #define CHECK_SLAB_OKAY(X) do {} while (0)
  26 #endif
  27
  28 #define FCRYPT_BSIZE 8
  29 struct rxrpc_crypt {
  30         union {
  31                 u8      x[FCRYPT_BSIZE];
  32                 __be32  n[2];
  33         };
  34 } __attribute__((aligned(8)));
  35
  36 #define rxrpc_queue_work(WS)    queue_work(rxrpc_workqueue, (WS))
  37 #define rxrpc_queue_delayed_work(WS,D)  \
  38         queue_delayed_work(rxrpc_workqueue, (WS), (D))
  39
  40 struct rxrpc_connection;
  41
  42 /*
  43  * Mark applied to socket buffers.
  44  */
  45 enum rxrpc_skb_mark {
  46         RXRPC_SKB_MARK_DATA,            /* data message */
  47         RXRPC_SKB_MARK_FINAL_ACK,       /* final ACK received message */
  48         RXRPC_SKB_MARK_BUSY,            /* server busy message */
  49         RXRPC_SKB_MARK_REMOTE_ABORT,    /* remote abort message */
  50         RXRPC_SKB_MARK_LOCAL_ABORT,     /* local abort message */
  51         RXRPC_SKB_MARK_NET_ERROR,       /* network error message */
  52         RXRPC_SKB_MARK_LOCAL_ERROR,     /* local error message */
  53         RXRPC_SKB_MARK_NEW_CALL,        /* local error message */
  54 };
  55
  56 /*
  57  * sk_state for RxRPC sockets
  58  */
  59 enum {
  60         RXRPC_UNBOUND = 0,
  61         RXRPC_CLIENT_UNBOUND,           /* Unbound socket used as client */
  62         RXRPC_CLIENT_BOUND,             /* client local address bound */
  63         RXRPC_SERVER_BOUND,             /* server local address bound */
  64         RXRPC_SERVER_LISTENING,         /* server listening for connections */
  65         RXRPC_SERVER_LISTEN_DISABLED,   /* server listening disabled */
  66         RXRPC_CLOSE,                    /* socket is being closed */
  67 };
  68
  69 /*
  70  * Per-network namespace data.
  71  */
  72 struct rxrpc_net {
  73         struct proc_dir_entry   *proc_net;      /* Subdir in /proc/net */
  74         u32                     epoch;          /* Local epoch for detecting local-end reset */
  75         struct list_head        calls;          /* List of calls active in this namespace */
  76         rwlock_t                call_lock;      /* Lock for ->calls */
  77
  78         struct list_head        conn_proc_list; /* List of conns in this namespace for proc */
  79         struct list_head        service_conns;  /* Service conns in this namespace */
  80         rwlock_t                conn_lock;      /* Lock for ->conn_proc_list, ->service_conns */
  81         struct delayed_work     service_conn_reaper;
  82
  83         unsigned int            nr_client_conns;
  84         unsigned int            nr_active_client_conns;
  85         bool                    kill_all_client_conns;
  86         spinlock_t              client_conn_cache_lock; /* Lock for ->*_client_conns */
  87         spinlock_t              client_conn_discard_lock; /* Prevent multiple discarders */
  88         struct list_head        waiting_client_conns;
  89         struct list_head        active_client_conns;
  90         struct list_head        idle_client_conns;
  91         struct delayed_work     client_conn_reaper;
  92
  93         struct list_head        local_endpoints;
  94         struct mutex            local_mutex;    /* Lock for ->local_endpoints */
  95
  96         spinlock_t              peer_hash_lock; /* Lock for ->peer_hash */
  97         DECLARE_HASHTABLE       (peer_hash, 10);
  98 };
  99
 100 /*
 101  * Service backlog preallocation.
 102  *
 103  * This contains circular buffers of preallocated peers, connections and calls
 104  * for incoming service calls and their head and tail pointers.  This allows
 105  * calls to be set up in the data_ready handler, thereby avoiding the need to
 106  * shuffle packets around so much.
 107  */
 108 struct rxrpc_backlog {
 109         unsigned short          peer_backlog_head;
 110         unsigned short          peer_backlog_tail;
 111         unsigned short          conn_backlog_head;
 112         unsigned short          conn_backlog_tail;
 113         unsigned short          call_backlog_head;
 114         unsigned short          call_backlog_tail;
 115 #define RXRPC_BACKLOG_MAX       32
 116         struct rxrpc_peer       *peer_backlog[RXRPC_BACKLOG_MAX];
 117         struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
 118         struct rxrpc_call       *call_backlog[RXRPC_BACKLOG_MAX];
 119 };
 120
 121 /*
 122  * RxRPC socket definition
 123  */
 124 struct rxrpc_sock {
 125         /* WARNING: sk has to be the first member */
 126         struct sock             sk;
 127         rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
 128         rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
 129         struct rxrpc_local      *local;         /* local endpoint */
 130         struct rxrpc_backlog    *backlog;       /* Preallocation for services */
 131         spinlock_t              incoming_lock;  /* Incoming call vs service shutdown lock */
 132         struct list_head        sock_calls;     /* List of calls owned by this socket */
 133         struct list_head        to_be_accepted; /* calls awaiting acceptance */
 134         struct list_head        recvmsg_q;      /* Calls awaiting recvmsg's attention  */
 135         rwlock_t                recvmsg_lock;   /* Lock for recvmsg_q */
 136         struct key              *key;           /* security for this socket */
 137         struct key              *securities;    /* list of server security descriptors */
 138         struct rb_root          calls;          /* User ID -> call mapping */
 139         unsigned long           flags;
 140 #define RXRPC_SOCK_CONNECTED            0       /* connect_srx is set */
 141         rwlock_t                call_lock;      /* lock for calls */
 142         u32                     min_sec_level;  /* minimum security level */
 143 #define RXRPC_SECURITY_MAX      RXRPC_SECURITY_ENCRYPT
 144         bool                    exclusive;      /* Exclusive connection for a client socket */
 145         sa_family_t             family;         /* Protocol family created with */
 146         struct sockaddr_rxrpc   srx;            /* local address */
 147         struct sockaddr_rxrpc   connect_srx;    /* Default client address from connect() */
 148 };
 149
 150 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
 151
 152 /*
 153  * CPU-byteorder normalised Rx packet header.
 154  */
 155 struct rxrpc_host_header {
 156         u32             epoch;          /* client boot timestamp */
 157         u32             cid;            /* connection and channel ID */
 158         u32             callNumber;     /* call ID (0 for connection-level packets) */
 159         u32             seq;            /* sequence number of pkt in call stream */
 160         u32             serial;         /* serial number of pkt sent to network */
 161         u8              type;           /* packet type */
 162         u8              flags;          /* packet flags */
 163         u8              userStatus;     /* app-layer defined status */
 164         u8              securityIndex;  /* security protocol ID */
 165         union {
 166                 u16     _rsvd;          /* reserved */
 167                 u16     cksum;          /* kerberos security checksum */
 168         };
 169         u16             serviceId;      /* service ID */
 170 } __packed;
 171
 172 /*
 173  * RxRPC socket buffer private variables
 174  * - max 48 bytes (struct sk_buff::cb)
 175  */
 176 struct rxrpc_skb_priv {
 177         union {
 178                 u8              nr_jumbo;       /* Number of jumbo subpackets */
 179         };
 180         union {
 181                 int             remain;         /* amount of space remaining for next write */
 182         };
 183
 184         struct rxrpc_host_header hdr;           /* RxRPC packet header from this packet */
 185 };
 186
 187 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
 188
 189 /*
 190  * RxRPC security module interface
 191  */
 192 struct rxrpc_security {
 193         const char              *name;          /* name of this service */
 194         u8                      security_index; /* security type provided */
 195
 196         /* Initialise a security service */
 197         int (*init)(void);
 198
 199         /* Clean up a security service */
 200         void (*exit)(void);
 201
 202         /* initialise a connection's security */
 203         int (*init_connection_security)(struct rxrpc_connection *);
 204
 205         /* prime a connection's packet security */
 206         int (*prime_packet_security)(struct rxrpc_connection *);
 207
 208         /* impose security on a packet */
 209         int (*secure_packet)(struct rxrpc_call *,
 210                              struct sk_buff *,
 211                              size_t,
 212                              void *);
 213
 214         /* verify the security on a received packet */
 215         int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
 216                              unsigned int, unsigned int, rxrpc_seq_t, u16);
 217
 218         /* Locate the data in a received packet that has been verified. */
 219         void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
 220                             unsigned int *, unsigned int *);
 221
 222         /* issue a challenge */
 223         int (*issue_challenge)(struct rxrpc_connection *);
 224
 225         /* respond to a challenge */
 226         int (*respond_to_challenge)(struct rxrpc_connection *,
 227                                     struct sk_buff *,
 228                                     u32 *);
 229
 230         /* verify a response */
 231         int (*verify_response)(struct rxrpc_connection *,
 232                                struct sk_buff *,
 233                                u32 *);
 234
 235         /* clear connection security */
 236         void (*clear)(struct rxrpc_connection *);
 237 };
 238
 239 /*
 240  * RxRPC local transport endpoint description
 241  * - owned by a single AF_RXRPC socket
 242  * - pointed to by transport socket struct sk_user_data
 243  */
 244 struct rxrpc_local {
 245         struct rcu_head         rcu;
 246         atomic_t                usage;
 247         struct rxrpc_net        *rxnet;         /* The network ns in which this resides */
 248         struct list_head        link;
 249         struct socket           *socket;        /* my UDP socket */
 250         struct work_struct      processor;
 251         struct rxrpc_sock __rcu *service;       /* Service(s) listening on this endpoint */
 252         struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
 253         struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
 254         struct sk_buff_head     event_queue;    /* endpoint event packets awaiting processing */
 255         struct rb_root          client_conns;   /* Client connections by socket params */
 256         spinlock_t              client_conns_lock; /* Lock for client_conns */
 257         spinlock_t              lock;           /* access lock */
 258         rwlock_t                services_lock;  /* lock for services list */
 259         int                     debug_id;       /* debug ID for printks */
 260         bool                    dead;
 261         struct sockaddr_rxrpc   srx;            /* local address */
 262 };
 263
 264 /*
 265  * RxRPC remote transport endpoint definition
 266  * - matched by local endpoint, remote port, address and protocol type
 267  */
 268 struct rxrpc_peer {
 269         struct rcu_head         rcu;            /* This must be first */
 270         atomic_t                usage;
 271         unsigned long           hash_key;
 272         struct hlist_node       hash_link;
 273         struct rxrpc_local      *local;
 274         struct hlist_head       error_targets;  /* targets for net error distribution */
 275         struct work_struct      error_distributor;
 276         struct rb_root          service_conns;  /* Service connections */
 277         seqlock_t               service_conn_lock;
 278         spinlock_t              lock;           /* access lock */
 279         unsigned int            if_mtu;         /* interface MTU for this peer */
 280         unsigned int            mtu;            /* network MTU for this peer */
 281         unsigned int            maxdata;        /* data size (MTU - hdrsize) */
 282         unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
 283         int                     debug_id;       /* debug ID for printks */
 284         int                     error_report;   /* Net (+0) or local (+1000000) to distribute */
 285 #define RXRPC_LOCAL_ERROR_OFFSET 1000000
 286         struct sockaddr_rxrpc   srx;            /* remote address */
 287
 288         /* calculated RTT cache */
 289 #define RXRPC_RTT_CACHE_SIZE 32
 290         ktime_t                 rtt_last_req;   /* Time of last RTT request */
 291         u64                     rtt;            /* Current RTT estimate (in nS) */
 292         u64                     rtt_sum;        /* Sum of cache contents */
 293         u64                     rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */
 294         u8                      rtt_cursor;     /* next entry at which to insert */
 295         u8                      rtt_usage;      /* amount of cache actually used */
 296 };
 297
 298 /*
 299  * Keys for matching a connection.
 300  */
 301 struct rxrpc_conn_proto {
 302         union {
 303                 struct {
 304                         u32     epoch;          /* epoch of this connection */
 305                         u32     cid;            /* connection ID */
 306                 };
 307                 u64             index_key;
 308         };
 309 };
 310
 311 struct rxrpc_conn_parameters {
 312         struct rxrpc_local      *local;         /* Representation of local endpoint */
 313         struct rxrpc_peer       *peer;          /* Remote endpoint */
 314         struct key              *key;           /* Security details */
 315         bool                    exclusive;      /* T if conn is exclusive */
 316         u16                     service_id;     /* Service ID for this connection */
 317         u32                     security_level; /* Security level selected */
 318 };
 319
 320 /*
 321  * Bits in the connection flags.
 322  */
 323 enum rxrpc_conn_flag {
 324         RXRPC_CONN_HAS_IDR,             /* Has a client conn ID assigned */
 325         RXRPC_CONN_IN_SERVICE_CONNS,    /* Conn is in peer->service_conns */
 326         RXRPC_CONN_IN_CLIENT_CONNS,     /* Conn is in local->client_conns */
 327         RXRPC_CONN_EXPOSED,             /* Conn has extra ref for exposure */
 328         RXRPC_CONN_DONT_REUSE,          /* Don't reuse this connection */
 329         RXRPC_CONN_COUNTED,             /* Counted by rxrpc_nr_client_conns */
 330 };
 331
 332 /*
 333  * Events that can be raised upon a connection.
 334  */
 335 enum rxrpc_conn_event {
 336         RXRPC_CONN_EV_CHALLENGE,        /* Send challenge packet */
 337 };
 338
 339 /*
 340  * The connection cache state.
 341  */
 342 enum rxrpc_conn_cache_state {
 343         RXRPC_CONN_CLIENT_INACTIVE,     /* Conn is not yet listed */
 344         RXRPC_CONN_CLIENT_WAITING,      /* Conn is on wait list, waiting for capacity */
 345         RXRPC_CONN_CLIENT_ACTIVE,       /* Conn is on active list, doing calls */
 346         RXRPC_CONN_CLIENT_CULLED,       /* Conn is culled and delisted, doing calls */
 347         RXRPC_CONN_CLIENT_IDLE,         /* Conn is on idle list, doing mostly nothing */
 348         RXRPC_CONN__NR_CACHE_STATES
 349 };
 350
 351 /*
 352  * The connection protocol state.
 353  */
 354 enum rxrpc_conn_proto_state {
 355         RXRPC_CONN_UNUSED,              /* Connection not yet attempted */
 356         RXRPC_CONN_CLIENT,              /* Client connection */
 357         RXRPC_CONN_SERVICE_PREALLOC,    /* Service connection preallocation */
 358         RXRPC_CONN_SERVICE_UNSECURED,   /* Service unsecured connection */
 359         RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
 360         RXRPC_CONN_SERVICE,             /* Service secured connection */
 361         RXRPC_CONN_REMOTELY_ABORTED,    /* Conn aborted by peer */
 362         RXRPC_CONN_LOCALLY_ABORTED,     /* Conn aborted locally */
 363         RXRPC_CONN__NR_STATES
 364 };
 365
 366 /*
 367  * RxRPC connection definition
 368  * - matched by { local, peer, epoch, conn_id, direction }
 369  * - each connection can only handle four simultaneous calls
 370  */
 371 struct rxrpc_connection {
 372         struct rxrpc_conn_proto proto;
 373         struct rxrpc_conn_parameters params;
 374
 375         atomic_t                usage;
 376         struct rcu_head         rcu;
 377         struct list_head        cache_link;
 378
 379         spinlock_t              channel_lock;
 380         unsigned char           active_chans;   /* Mask of active channels */
 381 #define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1)
 382         struct list_head        waiting_calls;  /* Calls waiting for channels */
 383         struct rxrpc_channel {
 384                 struct rxrpc_call __rcu *call;          /* Active call */
 385                 u32                     call_id;        /* ID of current call */
 386                 u32                     call_counter;   /* Call ID counter */
 387                 u32                     last_call;      /* ID of last call */
 388                 u8                      last_type;      /* Type of last packet */
 389                 union {
 390                         u32             last_seq;
 391                         u32             last_abort;
 392                 };
 393         } channels[RXRPC_MAXCALLS];
 394
 395         struct work_struct      processor;      /* connection event processor */
 396         union {
 397                 struct rb_node  client_node;    /* Node in local->client_conns */
 398                 struct rb_node  service_node;   /* Node in peer->service_conns */
 399         };
 400         struct list_head        proc_link;      /* link in procfs list */
 401         struct list_head        link;           /* link in master connection list */
 402         struct sk_buff_head     rx_queue;       /* received conn-level packets */
 403         const struct rxrpc_security *security;  /* applied security module */
 404         struct key              *server_key;    /* security for this service */
 405         struct crypto_skcipher  *cipher;        /* encryption handle */
 406         struct rxrpc_crypt      csum_iv;        /* packet checksum base */
 407         unsigned long           flags;
 408         unsigned long           events;
 409         unsigned long           idle_timestamp; /* Time at which last became idle */
 410         spinlock_t              state_lock;     /* state-change lock */
 411         enum rxrpc_conn_cache_state cache_state;
 412         enum rxrpc_conn_proto_state state;      /* current state of connection */
 413         u32                     local_abort;    /* local abort code */
 414         u32                     remote_abort;   /* remote abort code */
 415         int                     debug_id;       /* debug ID for printks */
 416         atomic_t                serial;         /* packet serial number counter */
 417         unsigned int            hi_serial;      /* highest serial number received */
 418         u32                     security_nonce; /* response re-use preventer */
 419         u16                     service_id;     /* Service ID, possibly upgraded */
 420         u8                      size_align;     /* data size alignment (for security) */
 421         u8                      security_size;  /* security header size */
 422         u8                      security_ix;    /* security type */
 423         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
 424 };
 425
 426 /*
 427  * Flags in call->flags.
 428  */
 429 enum rxrpc_call_flag {
 430         RXRPC_CALL_RELEASED,            /* call has been released - no more message to userspace */
 431         RXRPC_CALL_HAS_USERID,          /* has a user ID attached */
 432         RXRPC_CALL_IS_SERVICE,          /* Call is service call */
 433         RXRPC_CALL_EXPOSED,             /* The call was exposed to the world */
 434         RXRPC_CALL_RX_LAST,             /* Received the last packet (at rxtx_top) */
 435         RXRPC_CALL_TX_LAST,             /* Last packet in Tx buffer (at rxtx_top) */
 436         RXRPC_CALL_SEND_PING,           /* A ping will need to be sent */
 437         RXRPC_CALL_PINGING,             /* Ping in process */
 438         RXRPC_CALL_RETRANS_TIMEOUT,     /* Retransmission due to timeout occurred */
 439 };
 440
 441 /*
 442  * Events that can be raised on a call.
 443  */
 444 enum rxrpc_call_event {
 445         RXRPC_CALL_EV_ACK,              /* need to generate ACK */
 446         RXRPC_CALL_EV_ABORT,            /* need to generate abort */
 447         RXRPC_CALL_EV_TIMER,            /* Timer expired */
 448         RXRPC_CALL_EV_RESEND,           /* Tx resend required */
 449         RXRPC_CALL_EV_PING,             /* Ping send required */
 450 };
 451
 452 /*
 453  * The states that a call can be in.
 454  */
 455 enum rxrpc_call_state {
 456         RXRPC_CALL_UNINITIALISED,
 457         RXRPC_CALL_CLIENT_AWAIT_CONN,   /* - client waiting for connection to become available */
 458         RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
 459         RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
 460         RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
 461         RXRPC_CALL_SERVER_PREALLOC,     /* - service preallocation */
 462         RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
 463         RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
 464         RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
 465         RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
 466         RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
 467         RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
 468         RXRPC_CALL_COMPLETE,            /* - call complete */
 469         NR__RXRPC_CALL_STATES
 470 };
 471
 472 /*
 473  * Call completion condition (state == RXRPC_CALL_COMPLETE).
 474  */
 475 enum rxrpc_call_completion {
 476         RXRPC_CALL_SUCCEEDED,           /* - Normal termination */
 477         RXRPC_CALL_REMOTELY_ABORTED,    /* - call aborted by peer */
 478         RXRPC_CALL_LOCALLY_ABORTED,     /* - call aborted locally on error or close */
 479         RXRPC_CALL_LOCAL_ERROR,         /* - call failed due to local error */
 480         RXRPC_CALL_NETWORK_ERROR,       /* - call terminated by network error */
 481         NR__RXRPC_CALL_COMPLETIONS
 482 };
 483
 484 /*
 485  * Call Tx congestion management modes.
 486  */
 487 enum rxrpc_congest_mode {
 488         RXRPC_CALL_SLOW_START,
 489         RXRPC_CALL_CONGEST_AVOIDANCE,
 490         RXRPC_CALL_PACKET_LOSS,
 491         RXRPC_CALL_FAST_RETRANSMIT,
 492         NR__RXRPC_CONGEST_MODES
 493 };
 494
 495 /*
 496  * RxRPC call definition
 497  * - matched by { connection, call_id }
 498  */
 499 struct rxrpc_call {
 500         struct rcu_head         rcu;
 501         struct rxrpc_connection *conn;          /* connection carrying call */
 502         struct rxrpc_peer       *peer;          /* Peer record for remote address */
 503         struct rxrpc_sock __rcu *socket;        /* socket responsible */
 504         struct mutex            user_mutex;     /* User access mutex */
 505         ktime_t                 ack_at;         /* When deferred ACK needs to happen */
 506         ktime_t                 resend_at;      /* When next resend needs to happen */
 507         ktime_t                 ping_at;        /* When next to send a ping */
 508         ktime_t                 expire_at;      /* When the call times out */
 509         struct timer_list       timer;          /* Combined event timer */
 510         struct work_struct      processor;      /* Event processor */
 511         rxrpc_notify_rx_t       notify_rx;      /* kernel service Rx notification function */
 512         struct list_head        link;           /* link in master call list */
 513         struct list_head        chan_wait_link; /* Link in conn->waiting_calls */
 514         struct hlist_node       error_link;     /* link in error distribution list */
 515         struct list_head        accept_link;    /* Link in rx->acceptq */
 516         struct list_head        recvmsg_link;   /* Link in rx->recvmsg_q */
 517         struct list_head        sock_link;      /* Link in rx->sock_calls */
 518         struct rb_node          sock_node;      /* Node in rx->calls */
 519         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
 520         wait_queue_head_t       waitq;          /* Wait queue for channel or Tx */
 521         __be32                  crypto_buf[2];  /* Temporary packet crypto buffer */
 522         unsigned long           user_call_ID;   /* user-defined call ID */
 523         unsigned long           flags;
 524         unsigned long           events;
 525         spinlock_t              lock;
 526         rwlock_t                state_lock;     /* lock for state transition */
 527         u32                     abort_code;     /* Local/remote abort code */
 528         int                     error;          /* Local error incurred */
 529         enum rxrpc_call_state   state;          /* current state of call */
 530         enum rxrpc_call_completion completion;  /* Call completion condition */
 531         atomic_t                usage;
 532         u16                     service_id;     /* service ID */
 533         u8                      security_ix;    /* Security type */
 534         u32                     call_id;        /* call ID on connection  */
 535         u32                     cid;            /* connection ID plus channel index */
 536         int                     debug_id;       /* debug ID for printks */
 537         unsigned short          rx_pkt_offset;  /* Current recvmsg packet offset */
 538         unsigned short          rx_pkt_len;     /* Current recvmsg packet len */
 539
 540         /* Rx/Tx circular buffer, depending on phase.
 541          *
 542          * In the Rx phase, packets are annotated with 0 or the number of the
 543          * segment of a jumbo packet each buffer refers to.  There can be up to
 544          * 47 segments in a maximum-size UDP packet.
 545          *
 546          * In the Tx phase, packets are annotated with which buffers have been
 547          * acked.
 548          */
 549 #define RXRPC_RXTX_BUFF_SIZE    64
 550 #define RXRPC_RXTX_BUFF_MASK    (RXRPC_RXTX_BUFF_SIZE - 1)
 551 #define RXRPC_INIT_RX_WINDOW_SIZE 32
 552         struct sk_buff          **rxtx_buffer;
 553         u8                      *rxtx_annotations;
 554 #define RXRPC_TX_ANNO_ACK       0
 555 #define RXRPC_TX_ANNO_UNACK     1
 556 #define RXRPC_TX_ANNO_NAK       2
 557 #define RXRPC_TX_ANNO_RETRANS   3
 558 #define RXRPC_TX_ANNO_MASK      0x03
 559 #define RXRPC_TX_ANNO_LAST      0x04
 560 #define RXRPC_TX_ANNO_RESENT    0x08
 561
 562 #define RXRPC_RX_ANNO_JUMBO     0x3f            /* Jumbo subpacket number + 1 if not zero */
 563 #define RXRPC_RX_ANNO_JLAST     0x40            /* Set if last element of a jumbo packet */
 564 #define RXRPC_RX_ANNO_VERIFIED  0x80            /* Set if verified and decrypted */
 565         rxrpc_seq_t             tx_hard_ack;    /* Dead slot in buffer; the first transmitted but
 566                                                  * not hard-ACK'd packet follows this.
 567                                                  */
 568         rxrpc_seq_t             tx_top;         /* Highest Tx slot allocated. */
 569
 570         /* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
 571          * is fixed, we keep these numbers in terms of segments (ie. DATA
 572          * packets) rather than bytes.
 573          */
 574 #define RXRPC_TX_SMSS           RXRPC_JUMBO_DATALEN
 575         u8                      cong_cwnd;      /* Congestion window size */
 576         u8                      cong_extra;     /* Extra to send for congestion management */
 577         u8                      cong_ssthresh;  /* Slow-start threshold */
 578         enum rxrpc_congest_mode cong_mode:8;    /* Congestion management mode */
 579         u8                      cong_dup_acks;  /* Count of ACKs showing missing packets */
 580         u8                      cong_cumul_acks; /* Cumulative ACK count */
 581         ktime_t                 cong_tstamp;    /* Last time cwnd was changed */
 582
 583         rxrpc_seq_t             rx_hard_ack;    /* Dead slot in buffer; the first received but not
 584                                                  * consumed packet follows this.
 585                                                  */
 586         rxrpc_seq_t             rx_top;         /* Highest Rx slot allocated. */
 587         rxrpc_seq_t             rx_expect_next; /* Expected next packet sequence number */
 588         u8                      rx_winsize;     /* Size of Rx window */
 589         u8                      tx_winsize;     /* Maximum size of Tx window */
 590         bool                    tx_phase;       /* T if transmission phase, F if receive phase */
 591         u8                      nr_jumbo_bad;   /* Number of jumbo dups/exceeds-windows */
 592
 593         /* receive-phase ACK management */
 594         u8                      ackr_reason;    /* reason to ACK */
 595         u16                     ackr_skew;      /* skew on packet being ACK'd */
 596         rxrpc_serial_t          ackr_serial;    /* serial of packet being ACK'd */
 597         rxrpc_seq_t             ackr_prev_seq;  /* previous sequence number received */
 598         rxrpc_seq_t             ackr_consumed;  /* Highest packet shown consumed */
 599         rxrpc_seq_t             ackr_seen;      /* Highest packet shown seen */
 600
 601         /* ping management */
 602         rxrpc_serial_t          ping_serial;    /* Last ping sent */
 603         ktime_t                 ping_time;      /* Time last ping sent */
 604
 605         /* transmission-phase ACK management */
 606         ktime_t                 acks_latest_ts; /* Timestamp of latest ACK received */
 607         rxrpc_serial_t          acks_latest;    /* serial number of latest ACK received */
 608         rxrpc_seq_t             acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
 609 };
 610
 611 /*
 612  * Summary of a new ACK and the changes it made to the Tx buffer packet states.
 613  */
 614 struct rxrpc_ack_summary {
 615         u8                      ack_reason;
 616         u8                      nr_acks;                /* Number of ACKs in packet */
 617         u8                      nr_nacks;               /* Number of NACKs in packet */
 618         u8                      nr_new_acks;            /* Number of new ACKs in packet */
 619         u8                      nr_new_nacks;           /* Number of new NACKs in packet */
 620         u8                      nr_rot_new_acks;        /* Number of rotated new ACKs */
 621         bool                    new_low_nack;           /* T if new low NACK found */
 622         bool                    retrans_timeo;          /* T if reTx due to timeout happened */
 623         u8                      flight_size;            /* Number of unreceived transmissions */
 624         /* Place to stash values for tracing */
 625         enum rxrpc_congest_mode mode:8;
 626         u8                      cwnd;
 627         u8                      ssthresh;
 628         u8                      dup_acks;
 629         u8                      cumulative_acks;
 630 };
 631
 632 #include <trace/events/rxrpc.h>
 633
 634 /*
 635  * af_rxrpc.c
 636  */
 637 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
 638 extern atomic_t rxrpc_debug_id;
 639 extern struct workqueue_struct *rxrpc_workqueue;
 640
 641 /*
 642  * call_accept.c
 643  */
 644 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
 645 void rxrpc_discard_prealloc(struct rxrpc_sock *);
 646 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
 647                                            struct rxrpc_connection *,
 648                                            struct sk_buff *);
 649 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
 650 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
 651                                      rxrpc_notify_rx_t);
 652 int rxrpc_reject_call(struct rxrpc_sock *);
 653
 654 /*
 655  * call_event.c
 656  */
 657 void __rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t);
 658 void rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t);
 659 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
 660                        enum rxrpc_propose_ack_trace);
 661 void rxrpc_process_call(struct work_struct *);
 662
 663 /*
 664  * call_object.c
 665  */
 666 extern const char *const rxrpc_call_states[];
 667 extern const char *const rxrpc_call_completions[];
 668 extern unsigned int rxrpc_max_call_lifetime;
 669 extern struct kmem_cache *rxrpc_call_jar;
 670
 671 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
 672 struct rxrpc_call *rxrpc_alloc_call(gfp_t);
 673 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
 674                                          struct rxrpc_conn_parameters *,
 675                                          struct sockaddr_rxrpc *,
 676                                          unsigned long, gfp_t);
 677 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
 678                          struct sk_buff *);
 679 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
 680 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 681 bool __rxrpc_queue_call(struct rxrpc_call *);
 682 bool rxrpc_queue_call(struct rxrpc_call *);
 683 void rxrpc_see_call(struct rxrpc_call *);
 684 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
 685 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
 686 void rxrpc_cleanup_call(struct rxrpc_call *);
 687 void rxrpc_destroy_all_calls(struct rxrpc_net *);
 688
 689 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
 690 {
 691         return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
 692 }
 693
 694 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
 695 {
 696         return !rxrpc_is_service_call(call);
 697 }
 698
 699 /*
 700  * Transition a call to the complete state.
 701  */
 702 static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
 703                                                enum rxrpc_call_completion compl,
 704                                                u32 abort_code,
 705                                                int error)
 706 {
 707         if (call->state < RXRPC_CALL_COMPLETE) {
 708                 call->abort_code = abort_code;
 709                 call->error = error;
 710                 call->completion = compl,
 711                 call->state = RXRPC_CALL_COMPLETE;
 712                 wake_up(&call->waitq);
 713                 return true;
 714         }
 715         return false;
 716 }
 717
 718 static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
 719                                              enum rxrpc_call_completion compl,
 720                                              u32 abort_code,
 721                                              int error)
 722 {
 723         bool ret;
 724
 725         write_lock_bh(&call->state_lock);
 726         ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
 727         write_unlock_bh(&call->state_lock);
 728         return ret;
 729 }
 730
 731 /*
 732  * Record that a call successfully completed.
 733  */
 734 static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
 735 {
 736         return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
 737 }
 738
 739 static inline bool rxrpc_call_completed(struct rxrpc_call *call)
 740 {
 741         bool ret;
 742
 743         write_lock_bh(&call->state_lock);
 744         ret = __rxrpc_call_completed(call);
 745         write_unlock_bh(&call->state_lock);
 746         return ret;
 747 }
 748
 749 /*
 750  * Record that a call is locally aborted.
 751  */
 752 static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 753                                       rxrpc_seq_t seq,
 754                                       u32 abort_code, int error)
 755 {
 756         trace_rxrpc_abort(why, call->cid, call->call_id, seq,
 757                           abort_code, error);
 758         return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
 759                                            abort_code, error);
 760 }
 761
 762 static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 763                                     rxrpc_seq_t seq, u32 abort_code, int error)
 764 {
 765         bool ret;
 766
 767         write_lock_bh(&call->state_lock);
 768         ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
 769         write_unlock_bh(&call->state_lock);
 770         return ret;
 771 }
 772
 773 /*
 774  * Abort a call due to a protocol error.
 775  */
 776 static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
 777                                         struct sk_buff *skb,
 778                                         const char *eproto_why,
 779                                         const char *why,
 780                                         u32 abort_code)
 781 {
 782         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 783
 784         trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
 785         return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
 786 }
 787
 788 #define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
 789         __rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
 790                              (abort_why), (abort_code))
 791
 792 /*
 793  * conn_client.c
 794  */
 795 extern unsigned int rxrpc_max_client_connections;
 796 extern unsigned int rxrpc_reap_client_connections;
 797 extern unsigned int rxrpc_conn_idle_client_expiry;
 798 extern unsigned int rxrpc_conn_idle_client_fast_expiry;
 799 extern struct idr rxrpc_client_conn_ids;
 800
 801 void rxrpc_destroy_client_conn_ids(void);
 802 int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *,
 803                        struct sockaddr_rxrpc *, gfp_t);
 804 void rxrpc_expose_client_call(struct rxrpc_call *);
 805 void rxrpc_disconnect_client_call(struct rxrpc_call *);
 806 void rxrpc_put_client_conn(struct rxrpc_connection *);
 807 void rxrpc_discard_expired_client_conns(struct work_struct *);
 808 void rxrpc_destroy_all_client_connections(struct rxrpc_net *);
 809
 810 /*
 811  * conn_event.c
 812  */
 813 void rxrpc_process_connection(struct work_struct *);
 814
 815 /*
 816  * conn_object.c
 817  */
 818 extern unsigned int rxrpc_connection_expiry;
 819
 820 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
 821 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
 822 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
 823                                                    struct sk_buff *);
 824 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
 825 void rxrpc_disconnect_call(struct rxrpc_call *);
 826 void rxrpc_kill_connection(struct rxrpc_connection *);
 827 bool rxrpc_queue_conn(struct rxrpc_connection *);
 828 void rxrpc_see_connection(struct rxrpc_connection *);
 829 void rxrpc_get_connection(struct rxrpc_connection *);
 830 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
 831 void rxrpc_put_service_conn(struct rxrpc_connection *);
 832 void rxrpc_service_connection_reaper(struct work_struct *);
 833 void rxrpc_destroy_all_connections(struct rxrpc_net *);
 834
 835 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
 836 {
 837         return conn->out_clientflag;
 838 }
 839
 840 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
 841 {
 842         return !rxrpc_conn_is_client(conn);
 843 }
 844
 845 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
 846 {
 847         if (!conn)
 848                 return;
 849
 850         if (rxrpc_conn_is_client(conn))
 851                 rxrpc_put_client_conn(conn);
 852         else
 853                 rxrpc_put_service_conn(conn);
 854 }
 855
 856 /*
 857  * conn_service.c
 858  */
 859 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
 860                                                      struct sk_buff *);
 861 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
 862 void rxrpc_new_incoming_connection(struct rxrpc_connection *, struct sk_buff *);
 863 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
 864
 865 /*
 866  * input.c
 867  */
 868 void rxrpc_data_ready(struct sock *);
 869
 870 /*
 871  * insecure.c
 872  */
 873 extern const struct rxrpc_security rxrpc_no_security;
 874
 875 /*
 876  * key.c
 877  */
 878 extern struct key_type key_type_rxrpc;
 879 extern struct key_type key_type_rxrpc_s;
 880
 881 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
 882 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
 883 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time_t,
 884                               u32);
 885
 886 /*
 887  * local_event.c
 888  */
 889 extern void rxrpc_process_local_events(struct rxrpc_local *);
 890
 891 /*
 892  * local_object.c
 893  */
 894 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
 895 void __rxrpc_put_local(struct rxrpc_local *);
 896 void rxrpc_destroy_all_locals(struct rxrpc_net *);
 897
 898 static inline void rxrpc_get_local(struct rxrpc_local *local)
 899 {
 900         atomic_inc(&local->usage);
 901 }
 902
 903 static inline
 904 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local)
 905 {
 906         return atomic_inc_not_zero(&local->usage) ? local : NULL;
 907 }
 908
 909 static inline void rxrpc_put_local(struct rxrpc_local *local)
 910 {
 911         if (local && atomic_dec_and_test(&local->usage))
 912                 __rxrpc_put_local(local);
 913 }
 914
 915 static inline void rxrpc_queue_local(struct rxrpc_local *local)
 916 {
 917         rxrpc_queue_work(&local->processor);
 918 }
 919
 920 /*
 921  * misc.c
 922  */
 923 extern unsigned int rxrpc_max_backlog __read_mostly;
 924 extern unsigned int rxrpc_requested_ack_delay;
 925 extern unsigned int rxrpc_soft_ack_delay;
 926 extern unsigned int rxrpc_idle_ack_delay;
 927 extern unsigned int rxrpc_rx_window_size;
 928 extern unsigned int rxrpc_rx_mtu;
 929 extern unsigned int rxrpc_rx_jumbo_max;
 930 extern unsigned int rxrpc_resend_timeout;
 931
 932 extern const s8 rxrpc_ack_priority[];
 933
 934 /*
 935  * net_ns.c
 936  */
 937 extern unsigned int rxrpc_net_id;
 938 extern struct pernet_operations rxrpc_net_ops;
 939
 940 static inline struct rxrpc_net *rxrpc_net(struct net *net)
 941 {
 942         return net_generic(net, rxrpc_net_id);
 943 }
 944
 945 /*
 946  * output.c
 947  */
 948 int rxrpc_send_ack_packet(struct rxrpc_call *, bool);
 949 int rxrpc_send_abort_packet(struct rxrpc_call *);
 950 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
 951 void rxrpc_reject_packets(struct rxrpc_local *);
 952
 953 /*
 954  * peer_event.c
 955  */
 956 void rxrpc_error_report(struct sock *);
 957 void rxrpc_peer_error_distributor(struct work_struct *);
 958 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
 959                         rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
 960
 961 /*
 962  * peer_object.c
 963  */
 964 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
 965                                          const struct sockaddr_rxrpc *);
 966 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *,
 967                                      struct sockaddr_rxrpc *, gfp_t);
 968 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
 969 struct rxrpc_peer *rxrpc_lookup_incoming_peer(struct rxrpc_local *,
 970                                               struct rxrpc_peer *);
 971
 972 static inline struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer)
 973 {
 974         atomic_inc(&peer->usage);
 975         return peer;
 976 }
 977
 978 static inline
 979 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer)
 980 {
 981         return atomic_inc_not_zero(&peer->usage) ? peer : NULL;
 982 }
 983
 984 extern void __rxrpc_put_peer(struct rxrpc_peer *peer);
 985 static inline void rxrpc_put_peer(struct rxrpc_peer *peer)
 986 {
 987         if (peer && atomic_dec_and_test(&peer->usage))
 988                 __rxrpc_put_peer(peer);
 989 }
 990
 991 /*
 992  * proc.c
 993  */
 994 extern const struct file_operations rxrpc_call_seq_fops;
 995 extern const struct file_operations rxrpc_connection_seq_fops;
 996
 997 /*
 998  * recvmsg.c
 999  */
1000 void rxrpc_notify_socket(struct rxrpc_call *);
1001 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1002
1003 /*
1004  * rxkad.c
1005  */
1006 #ifdef CONFIG_RXKAD
1007 extern const struct rxrpc_security rxkad;
1008 #endif
1009
1010 /*
1011  * security.c
1012  */
1013 int __init rxrpc_init_security(void);
1014 void rxrpc_exit_security(void);
1015 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1016 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
1017
1018 /*
1019  * sendmsg.c
1020  */
1021 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1022
1023 /*
1024  * skbuff.c
1025  */
1026 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1027 void rxrpc_packet_destructor(struct sk_buff *);
1028 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1029 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1030 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1031 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1032 void rxrpc_lose_skb(struct sk_buff *, enum rxrpc_skb_trace);
1033 void rxrpc_purge_queue(struct sk_buff_head *);
1034
1035 /*
1036  * sysctl.c
1037  */
1038 #ifdef CONFIG_SYSCTL
1039 extern int __init rxrpc_sysctl_init(void);
1040 extern void rxrpc_sysctl_exit(void);
1041 #else
1042 static inline int __init rxrpc_sysctl_init(void) { return 0; }
1043 static inline void rxrpc_sysctl_exit(void) {}
1044 #endif
1045
1046 /*
1047  * utils.c
1048  */
1049 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1050
1051 static inline bool before(u32 seq1, u32 seq2)
1052 {
1053         return (s32)(seq1 - seq2) < 0;
1054 }
1055 static inline bool before_eq(u32 seq1, u32 seq2)
1056 {
1057         return (s32)(seq1 - seq2) <= 0;
1058 }
1059 static inline bool after(u32 seq1, u32 seq2)
1060 {
1061         return (s32)(seq1 - seq2) > 0;
1062 }
1063 static inline bool after_eq(u32 seq1, u32 seq2)
1064 {
1065         return (s32)(seq1 - seq2) >= 0;
1066 }
1067
1068 /*
1069  * debug tracing
1070  */
1071 extern unsigned int rxrpc_debug;
1072
1073 #define dbgprintk(FMT,...) \
1074         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1075
1076 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1077 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1078 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
1079 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
1080 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1081
1082
1083 #if defined(__KDEBUG)
1084 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1085 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1086 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1087 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
1088 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
1089
1090 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1091 #define RXRPC_DEBUG_KENTER      0x01
1092 #define RXRPC_DEBUG_KLEAVE      0x02
1093 #define RXRPC_DEBUG_KDEBUG      0x04
1094 #define RXRPC_DEBUG_KPROTO      0x08
1095 #define RXRPC_DEBUG_KNET        0x10
1096
1097 #define _enter(FMT,...)                                 \
1098 do {                                                    \
1099         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1100                 kenter(FMT,##__VA_ARGS__);              \
1101 } while (0)
1102
1103 #define _leave(FMT,...)                                 \
1104 do {                                                    \
1105         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1106                 kleave(FMT,##__VA_ARGS__);              \
1107 } while (0)
1108
1109 #define _debug(FMT,...)                                 \
1110 do {                                                    \
1111         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1112                 kdebug(FMT,##__VA_ARGS__);              \
1113 } while (0)
1114
1115 #define _proto(FMT,...)                                 \
1116 do {                                                    \
1117         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
1118                 kproto(FMT,##__VA_ARGS__);              \
1119 } while (0)
1120
1121 #define _net(FMT,...)                                   \
1122 do {                                                    \
1123         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
1124                 knet(FMT,##__VA_ARGS__);                \
1125 } while (0)
1126
1127 #else
1128 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1129 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1130 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
1131 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
1132 #define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
1133 #endif
1134
1135 /*
1136  * debug assertion checking
1137  */
1138 #if 1 // defined(__KDEBUGALL)
1139
1140 #define ASSERT(X)                                               \
1141 do {                                                            \
1142         if (unlikely(!(X))) {                                   \
1143                 pr_err("Assertion failed\n");                   \
1144                 BUG();                                          \
1145         }                                                       \
1146 } while (0)
1147
1148 #define ASSERTCMP(X, OP, Y)                                             \
1149 do {                                                                    \
1150         __typeof__(X) _x = (X);                                         \
1151         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1152         if (unlikely(!(_x OP _y))) {                                    \
1153                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1154                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1155                        (unsigned long)_y, (unsigned long)_y);           \
1156                 BUG();                                                  \
1157         }                                                               \
1158 } while (0)
1159
1160 #define ASSERTIF(C, X)                                          \
1161 do {                                                            \
1162         if (unlikely((C) && !(X))) {                            \
1163                 pr_err("Assertion failed\n");                   \
1164                 BUG();                                          \
1165         }                                                       \
1166 } while (0)
1167
1168 #define ASSERTIFCMP(C, X, OP, Y)                                        \
1169 do {                                                                    \
1170         __typeof__(X) _x = (X);                                         \
1171         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1172         if (unlikely((C) && !(_x OP _y))) {                             \
1173                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1174                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1175                        (unsigned long)_y, (unsigned long)_y);           \
1176                 BUG();                                                  \
1177         }                                                               \
1178 } while (0)
1179
1180 #else
1181
1182 #define ASSERT(X)                               \
1183 do {                                            \
1184 } while (0)
1185
1186 #define ASSERTCMP(X, OP, Y)                     \
1187 do {                                            \
1188 } while (0)
1189
1190 #define ASSERTIF(C, X)                          \
1191 do {                                            \
1192 } while (0)
1193
1194 #define ASSERTIFCMP(C, X, OP, Y)                \
1195 do {                                            \
1196 } while (0)
1197
1198 #endif /* __KDEBUGALL */