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_BOUND2,            /* second server local address bound */
  65         RXRPC_SERVER_LISTENING,         /* server listening for connections */
  66         RXRPC_SERVER_LISTEN_DISABLED,   /* server listening disabled */
  67         RXRPC_CLOSE,                    /* socket is being closed */
  68 };
  69
  70 /*
  71  * Per-network namespace data.
  72  */
  73 struct rxrpc_net {
  74         struct proc_dir_entry   *proc_net;      /* Subdir in /proc/net */
  75         u32                     epoch;          /* Local epoch for detecting local-end reset */
  76         struct list_head        calls;          /* List of calls active in this namespace */
  77         rwlock_t                call_lock;      /* Lock for ->calls */
  78
  79         struct list_head        conn_proc_list; /* List of conns in this namespace for proc */
  80         struct list_head        service_conns;  /* Service conns in this namespace */
  81         rwlock_t                conn_lock;      /* Lock for ->conn_proc_list, ->service_conns */
  82         struct delayed_work     service_conn_reaper;
  83
  84         unsigned int            nr_client_conns;
  85         unsigned int            nr_active_client_conns;
  86         bool                    kill_all_client_conns;
  87         spinlock_t              client_conn_cache_lock; /* Lock for ->*_client_conns */
  88         spinlock_t              client_conn_discard_lock; /* Prevent multiple discarders */
  89         struct list_head        waiting_client_conns;
  90         struct list_head        active_client_conns;
  91         struct list_head        idle_client_conns;
  92         struct delayed_work     client_conn_reaper;
  93
  94         struct list_head        local_endpoints;
  95         struct mutex            local_mutex;    /* Lock for ->local_endpoints */
  96
  97         spinlock_t              peer_hash_lock; /* Lock for ->peer_hash */
  98         DECLARE_HASHTABLE       (peer_hash, 10);
  99 };
 100
 101 /*
 102  * Service backlog preallocation.
 103  *
 104  * This contains circular buffers of preallocated peers, connections and calls
 105  * for incoming service calls and their head and tail pointers.  This allows
 106  * calls to be set up in the data_ready handler, thereby avoiding the need to
 107  * shuffle packets around so much.
 108  */
 109 struct rxrpc_backlog {
 110         unsigned short          peer_backlog_head;
 111         unsigned short          peer_backlog_tail;
 112         unsigned short          conn_backlog_head;
 113         unsigned short          conn_backlog_tail;
 114         unsigned short          call_backlog_head;
 115         unsigned short          call_backlog_tail;
 116 #define RXRPC_BACKLOG_MAX       32
 117         struct rxrpc_peer       *peer_backlog[RXRPC_BACKLOG_MAX];
 118         struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
 119         struct rxrpc_call       *call_backlog[RXRPC_BACKLOG_MAX];
 120 };
 121
 122 /*
 123  * RxRPC socket definition
 124  */
 125 struct rxrpc_sock {
 126         /* WARNING: sk has to be the first member */
 127         struct sock             sk;
 128         rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
 129         rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
 130         struct rxrpc_local      *local;         /* local endpoint */
 131         struct rxrpc_backlog    *backlog;       /* Preallocation for services */
 132         spinlock_t              incoming_lock;  /* Incoming call vs service shutdown lock */
 133         struct list_head        sock_calls;     /* List of calls owned by this socket */
 134         struct list_head        to_be_accepted; /* calls awaiting acceptance */
 135         struct list_head        recvmsg_q;      /* Calls awaiting recvmsg's attention  */
 136         rwlock_t                recvmsg_lock;   /* Lock for recvmsg_q */
 137         struct key              *key;           /* security for this socket */
 138         struct key              *securities;    /* list of server security descriptors */
 139         struct rb_root          calls;          /* User ID -> call mapping */
 140         unsigned long           flags;
 141 #define RXRPC_SOCK_CONNECTED            0       /* connect_srx is set */
 142         rwlock_t                call_lock;      /* lock for calls */
 143         u32                     min_sec_level;  /* minimum security level */
 144 #define RXRPC_SECURITY_MAX      RXRPC_SECURITY_ENCRYPT
 145         bool                    exclusive;      /* Exclusive connection for a client socket */
 146         u16                     second_service; /* Additional service bound to the endpoint */
 147         sa_family_t             family;         /* Protocol family created with */
 148         struct sockaddr_rxrpc   srx;            /* local address */
 149         struct sockaddr_rxrpc   connect_srx;    /* Default client address from connect() */
 150 };
 151
 152 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
 153
 154 /*
 155  * CPU-byteorder normalised Rx packet header.
 156  */
 157 struct rxrpc_host_header {
 158         u32             epoch;          /* client boot timestamp */
 159         u32             cid;            /* connection and channel ID */
 160         u32             callNumber;     /* call ID (0 for connection-level packets) */
 161         u32             seq;            /* sequence number of pkt in call stream */
 162         u32             serial;         /* serial number of pkt sent to network */
 163         u8              type;           /* packet type */
 164         u8              flags;          /* packet flags */
 165         u8              userStatus;     /* app-layer defined status */
 166         u8              securityIndex;  /* security protocol ID */
 167         union {
 168                 u16     _rsvd;          /* reserved */
 169                 u16     cksum;          /* kerberos security checksum */
 170         };
 171         u16             serviceId;      /* service ID */
 172 } __packed;
 173
 174 /*
 175  * RxRPC socket buffer private variables
 176  * - max 48 bytes (struct sk_buff::cb)
 177  */
 178 struct rxrpc_skb_priv {
 179         union {
 180                 u8              nr_jumbo;       /* Number of jumbo subpackets */
 181         };
 182         union {
 183                 int             remain;         /* amount of space remaining for next write */
 184         };
 185
 186         struct rxrpc_host_header hdr;           /* RxRPC packet header from this packet */
 187 };
 188
 189 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
 190
 191 /*
 192  * RxRPC security module interface
 193  */
 194 struct rxrpc_security {
 195         const char              *name;          /* name of this service */
 196         u8                      security_index; /* security type provided */
 197
 198         /* Initialise a security service */
 199         int (*init)(void);
 200
 201         /* Clean up a security service */
 202         void (*exit)(void);
 203
 204         /* initialise a connection's security */
 205         int (*init_connection_security)(struct rxrpc_connection *);
 206
 207         /* prime a connection's packet security */
 208         int (*prime_packet_security)(struct rxrpc_connection *);
 209
 210         /* impose security on a packet */
 211         int (*secure_packet)(struct rxrpc_call *,
 212                              struct sk_buff *,
 213                              size_t,
 214                              void *);
 215
 216         /* verify the security on a received packet */
 217         int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
 218                              unsigned int, unsigned int, rxrpc_seq_t, u16);
 219
 220         /* Locate the data in a received packet that has been verified. */
 221         void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
 222                             unsigned int *, unsigned int *);
 223
 224         /* issue a challenge */
 225         int (*issue_challenge)(struct rxrpc_connection *);
 226
 227         /* respond to a challenge */
 228         int (*respond_to_challenge)(struct rxrpc_connection *,
 229                                     struct sk_buff *,
 230                                     u32 *);
 231
 232         /* verify a response */
 233         int (*verify_response)(struct rxrpc_connection *,
 234                                struct sk_buff *,
 235                                u32 *);
 236
 237         /* clear connection security */
 238         void (*clear)(struct rxrpc_connection *);
 239 };
 240
 241 /*
 242  * RxRPC local transport endpoint description
 243  * - owned by a single AF_RXRPC socket
 244  * - pointed to by transport socket struct sk_user_data
 245  */
 246 struct rxrpc_local {
 247         struct rcu_head         rcu;
 248         atomic_t                usage;
 249         struct rxrpc_net        *rxnet;         /* The network ns in which this resides */
 250         struct list_head        link;
 251         struct socket           *socket;        /* my UDP socket */
 252         struct work_struct      processor;
 253         struct rxrpc_sock __rcu *service;       /* Service(s) listening on this endpoint */
 254         struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
 255         struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
 256         struct sk_buff_head     event_queue;    /* endpoint event packets awaiting processing */
 257         struct rb_root          client_conns;   /* Client connections by socket params */
 258         spinlock_t              client_conns_lock; /* Lock for client_conns */
 259         spinlock_t              lock;           /* access lock */
 260         rwlock_t                services_lock;  /* lock for services list */
 261         int                     debug_id;       /* debug ID for printks */
 262         bool                    dead;
 263         struct sockaddr_rxrpc   srx;            /* local address */
 264 };
 265
 266 /*
 267  * RxRPC remote transport endpoint definition
 268  * - matched by local endpoint, remote port, address and protocol type
 269  */
 270 struct rxrpc_peer {
 271         struct rcu_head         rcu;            /* This must be first */
 272         atomic_t                usage;
 273         unsigned long           hash_key;
 274         struct hlist_node       hash_link;
 275         struct rxrpc_local      *local;
 276         struct hlist_head       error_targets;  /* targets for net error distribution */
 277         struct work_struct      error_distributor;
 278         struct rb_root          service_conns;  /* Service connections */
 279         seqlock_t               service_conn_lock;
 280         spinlock_t              lock;           /* access lock */
 281         unsigned int            if_mtu;         /* interface MTU for this peer */
 282         unsigned int            mtu;            /* network MTU for this peer */
 283         unsigned int            maxdata;        /* data size (MTU - hdrsize) */
 284         unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
 285         int                     debug_id;       /* debug ID for printks */
 286         int                     error_report;   /* Net (+0) or local (+1000000) to distribute */
 287 #define RXRPC_LOCAL_ERROR_OFFSET 1000000
 288         struct sockaddr_rxrpc   srx;            /* remote address */
 289
 290         /* calculated RTT cache */
 291 #define RXRPC_RTT_CACHE_SIZE 32
 292         ktime_t                 rtt_last_req;   /* Time of last RTT request */
 293         u64                     rtt;            /* Current RTT estimate (in nS) */
 294         u64                     rtt_sum;        /* Sum of cache contents */
 295         u64                     rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */
 296         u8                      rtt_cursor;     /* next entry at which to insert */
 297         u8                      rtt_usage;      /* amount of cache actually used */
 298 };
 299
 300 /*
 301  * Keys for matching a connection.
 302  */
 303 struct rxrpc_conn_proto {
 304         union {
 305                 struct {
 306                         u32     epoch;          /* epoch of this connection */
 307                         u32     cid;            /* connection ID */
 308                 };
 309                 u64             index_key;
 310         };
 311 };
 312
 313 struct rxrpc_conn_parameters {
 314         struct rxrpc_local      *local;         /* Representation of local endpoint */
 315         struct rxrpc_peer       *peer;          /* Remote endpoint */
 316         struct key              *key;           /* Security details */
 317         bool                    exclusive;      /* T if conn is exclusive */
 318         u16                     service_id;     /* Service ID for this connection */
 319         u32                     security_level; /* Security level selected */
 320 };
 321
 322 /*
 323  * Bits in the connection flags.
 324  */
 325 enum rxrpc_conn_flag {
 326         RXRPC_CONN_HAS_IDR,             /* Has a client conn ID assigned */
 327         RXRPC_CONN_IN_SERVICE_CONNS,    /* Conn is in peer->service_conns */
 328         RXRPC_CONN_IN_CLIENT_CONNS,     /* Conn is in local->client_conns */
 329         RXRPC_CONN_EXPOSED,             /* Conn has extra ref for exposure */
 330         RXRPC_CONN_DONT_REUSE,          /* Don't reuse this connection */
 331         RXRPC_CONN_COUNTED,             /* Counted by rxrpc_nr_client_conns */
 332 };
 333
 334 /*
 335  * Events that can be raised upon a connection.
 336  */
 337 enum rxrpc_conn_event {
 338         RXRPC_CONN_EV_CHALLENGE,        /* Send challenge packet */
 339 };
 340
 341 /*
 342  * The connection cache state.
 343  */
 344 enum rxrpc_conn_cache_state {
 345         RXRPC_CONN_CLIENT_INACTIVE,     /* Conn is not yet listed */
 346         RXRPC_CONN_CLIENT_WAITING,      /* Conn is on wait list, waiting for capacity */
 347         RXRPC_CONN_CLIENT_ACTIVE,       /* Conn is on active list, doing calls */
 348         RXRPC_CONN_CLIENT_CULLED,       /* Conn is culled and delisted, doing calls */
 349         RXRPC_CONN_CLIENT_IDLE,         /* Conn is on idle list, doing mostly nothing */
 350         RXRPC_CONN__NR_CACHE_STATES
 351 };
 352
 353 /*
 354  * The connection protocol state.
 355  */
 356 enum rxrpc_conn_proto_state {
 357         RXRPC_CONN_UNUSED,              /* Connection not yet attempted */
 358         RXRPC_CONN_CLIENT,              /* Client connection */
 359         RXRPC_CONN_SERVICE_PREALLOC,    /* Service connection preallocation */
 360         RXRPC_CONN_SERVICE_UNSECURED,   /* Service unsecured connection */
 361         RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
 362         RXRPC_CONN_SERVICE,             /* Service secured connection */
 363         RXRPC_CONN_REMOTELY_ABORTED,    /* Conn aborted by peer */
 364         RXRPC_CONN_LOCALLY_ABORTED,     /* Conn aborted locally */
 365         RXRPC_CONN__NR_STATES
 366 };
 367
 368 /*
 369  * RxRPC connection definition
 370  * - matched by { local, peer, epoch, conn_id, direction }
 371  * - each connection can only handle four simultaneous calls
 372  */
 373 struct rxrpc_connection {
 374         struct rxrpc_conn_proto proto;
 375         struct rxrpc_conn_parameters params;
 376
 377         atomic_t                usage;
 378         struct rcu_head         rcu;
 379         struct list_head        cache_link;
 380
 381         spinlock_t              channel_lock;
 382         unsigned char           active_chans;   /* Mask of active channels */
 383 #define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1)
 384         struct list_head        waiting_calls;  /* Calls waiting for channels */
 385         struct rxrpc_channel {
 386                 struct rxrpc_call __rcu *call;          /* Active call */
 387                 u32                     call_id;        /* ID of current call */
 388                 u32                     call_counter;   /* Call ID counter */
 389                 u32                     last_call;      /* ID of last call */
 390                 u8                      last_type;      /* Type of last packet */
 391                 union {
 392                         u32             last_seq;
 393                         u32             last_abort;
 394                 };
 395         } channels[RXRPC_MAXCALLS];
 396
 397         struct work_struct      processor;      /* connection event processor */
 398         union {
 399                 struct rb_node  client_node;    /* Node in local->client_conns */
 400                 struct rb_node  service_node;   /* Node in peer->service_conns */
 401         };
 402         struct list_head        proc_link;      /* link in procfs list */
 403         struct list_head        link;           /* link in master connection list */
 404         struct sk_buff_head     rx_queue;       /* received conn-level packets */
 405         const struct rxrpc_security *security;  /* applied security module */
 406         struct key              *server_key;    /* security for this service */
 407         struct crypto_skcipher  *cipher;        /* encryption handle */
 408         struct rxrpc_crypt      csum_iv;        /* packet checksum base */
 409         unsigned long           flags;
 410         unsigned long           events;
 411         unsigned long           idle_timestamp; /* Time at which last became idle */
 412         spinlock_t              state_lock;     /* state-change lock */
 413         enum rxrpc_conn_cache_state cache_state;
 414         enum rxrpc_conn_proto_state state;      /* current state of connection */
 415         u32                     local_abort;    /* local abort code */
 416         u32                     remote_abort;   /* remote abort code */
 417         int                     debug_id;       /* debug ID for printks */
 418         atomic_t                serial;         /* packet serial number counter */
 419         unsigned int            hi_serial;      /* highest serial number received */
 420         u32                     security_nonce; /* response re-use preventer */
 421         u16                     service_id;     /* Service ID, possibly upgraded */
 422         u8                      size_align;     /* data size alignment (for security) */
 423         u8                      security_size;  /* security header size */
 424         u8                      security_ix;    /* security type */
 425         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
 426 };
 427
 428 /*
 429  * Flags in call->flags.
 430  */
 431 enum rxrpc_call_flag {
 432         RXRPC_CALL_RELEASED,            /* call has been released - no more message to userspace */
 433         RXRPC_CALL_HAS_USERID,          /* has a user ID attached */
 434         RXRPC_CALL_IS_SERVICE,          /* Call is service call */
 435         RXRPC_CALL_EXPOSED,             /* The call was exposed to the world */
 436         RXRPC_CALL_RX_LAST,             /* Received the last packet (at rxtx_top) */
 437         RXRPC_CALL_TX_LAST,             /* Last packet in Tx buffer (at rxtx_top) */
 438         RXRPC_CALL_SEND_PING,           /* A ping will need to be sent */
 439         RXRPC_CALL_PINGING,             /* Ping in process */
 440         RXRPC_CALL_RETRANS_TIMEOUT,     /* Retransmission due to timeout occurred */
 441 };
 442
 443 /*
 444  * Events that can be raised on a call.
 445  */
 446 enum rxrpc_call_event {
 447         RXRPC_CALL_EV_ACK,              /* need to generate ACK */
 448         RXRPC_CALL_EV_ABORT,            /* need to generate abort */
 449         RXRPC_CALL_EV_TIMER,            /* Timer expired */
 450         RXRPC_CALL_EV_RESEND,           /* Tx resend required */
 451         RXRPC_CALL_EV_PING,             /* Ping send required */
 452 };
 453
 454 /*
 455  * The states that a call can be in.
 456  */
 457 enum rxrpc_call_state {
 458         RXRPC_CALL_UNINITIALISED,
 459         RXRPC_CALL_CLIENT_AWAIT_CONN,   /* - client waiting for connection to become available */
 460         RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
 461         RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
 462         RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
 463         RXRPC_CALL_SERVER_PREALLOC,     /* - service preallocation */
 464         RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
 465         RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
 466         RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
 467         RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
 468         RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
 469         RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
 470         RXRPC_CALL_COMPLETE,            /* - call complete */
 471         NR__RXRPC_CALL_STATES
 472 };
 473
 474 /*
 475  * Call completion condition (state == RXRPC_CALL_COMPLETE).
 476  */
 477 enum rxrpc_call_completion {
 478         RXRPC_CALL_SUCCEEDED,           /* - Normal termination */
 479         RXRPC_CALL_REMOTELY_ABORTED,    /* - call aborted by peer */
 480         RXRPC_CALL_LOCALLY_ABORTED,     /* - call aborted locally on error or close */
 481         RXRPC_CALL_LOCAL_ERROR,         /* - call failed due to local error */
 482         RXRPC_CALL_NETWORK_ERROR,       /* - call terminated by network error */
 483         NR__RXRPC_CALL_COMPLETIONS
 484 };
 485
 486 /*
 487  * Call Tx congestion management modes.
 488  */
 489 enum rxrpc_congest_mode {
 490         RXRPC_CALL_SLOW_START,
 491         RXRPC_CALL_CONGEST_AVOIDANCE,
 492         RXRPC_CALL_PACKET_LOSS,
 493         RXRPC_CALL_FAST_RETRANSMIT,
 494         NR__RXRPC_CONGEST_MODES
 495 };
 496
 497 /*
 498  * RxRPC call definition
 499  * - matched by { connection, call_id }
 500  */
 501 struct rxrpc_call {
 502         struct rcu_head         rcu;
 503         struct rxrpc_connection *conn;          /* connection carrying call */
 504         struct rxrpc_peer       *peer;          /* Peer record for remote address */
 505         struct rxrpc_sock __rcu *socket;        /* socket responsible */
 506         struct mutex            user_mutex;     /* User access mutex */
 507         ktime_t                 ack_at;         /* When deferred ACK needs to happen */
 508         ktime_t                 resend_at;      /* When next resend needs to happen */
 509         ktime_t                 ping_at;        /* When next to send a ping */
 510         ktime_t                 expire_at;      /* When the call times out */
 511         struct timer_list       timer;          /* Combined event timer */
 512         struct work_struct      processor;      /* Event processor */
 513         rxrpc_notify_rx_t       notify_rx;      /* kernel service Rx notification function */
 514         struct list_head        link;           /* link in master call list */
 515         struct list_head        chan_wait_link; /* Link in conn->waiting_calls */
 516         struct hlist_node       error_link;     /* link in error distribution list */
 517         struct list_head        accept_link;    /* Link in rx->acceptq */
 518         struct list_head        recvmsg_link;   /* Link in rx->recvmsg_q */
 519         struct list_head        sock_link;      /* Link in rx->sock_calls */
 520         struct rb_node          sock_node;      /* Node in rx->calls */
 521         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
 522         wait_queue_head_t       waitq;          /* Wait queue for channel or Tx */
 523         __be32                  crypto_buf[2];  /* Temporary packet crypto buffer */
 524         unsigned long           user_call_ID;   /* user-defined call ID */
 525         unsigned long           flags;
 526         unsigned long           events;
 527         spinlock_t              lock;
 528         rwlock_t                state_lock;     /* lock for state transition */
 529         u32                     abort_code;     /* Local/remote abort code */
 530         int                     error;          /* Local error incurred */
 531         enum rxrpc_call_state   state;          /* current state of call */
 532         enum rxrpc_call_completion completion;  /* Call completion condition */
 533         atomic_t                usage;
 534         u16                     service_id;     /* service ID */
 535         u8                      security_ix;    /* Security type */
 536         u32                     call_id;        /* call ID on connection  */
 537         u32                     cid;            /* connection ID plus channel index */
 538         int                     debug_id;       /* debug ID for printks */
 539         unsigned short          rx_pkt_offset;  /* Current recvmsg packet offset */
 540         unsigned short          rx_pkt_len;     /* Current recvmsg packet len */
 541
 542         /* Rx/Tx circular buffer, depending on phase.
 543          *
 544          * In the Rx phase, packets are annotated with 0 or the number of the
 545          * segment of a jumbo packet each buffer refers to.  There can be up to
 546          * 47 segments in a maximum-size UDP packet.
 547          *
 548          * In the Tx phase, packets are annotated with which buffers have been
 549          * acked.
 550          */
 551 #define RXRPC_RXTX_BUFF_SIZE    64
 552 #define RXRPC_RXTX_BUFF_MASK    (RXRPC_RXTX_BUFF_SIZE - 1)
 553 #define RXRPC_INIT_RX_WINDOW_SIZE 32
 554         struct sk_buff          **rxtx_buffer;
 555         u8                      *rxtx_annotations;
 556 #define RXRPC_TX_ANNO_ACK       0
 557 #define RXRPC_TX_ANNO_UNACK     1
 558 #define RXRPC_TX_ANNO_NAK       2
 559 #define RXRPC_TX_ANNO_RETRANS   3
 560 #define RXRPC_TX_ANNO_MASK      0x03
 561 #define RXRPC_TX_ANNO_LAST      0x04
 562 #define RXRPC_TX_ANNO_RESENT    0x08
 563
 564 #define RXRPC_RX_ANNO_JUMBO     0x3f            /* Jumbo subpacket number + 1 if not zero */
 565 #define RXRPC_RX_ANNO_JLAST     0x40            /* Set if last element of a jumbo packet */
 566 #define RXRPC_RX_ANNO_VERIFIED  0x80            /* Set if verified and decrypted */
 567         rxrpc_seq_t             tx_hard_ack;    /* Dead slot in buffer; the first transmitted but
 568                                                  * not hard-ACK'd packet follows this.
 569                                                  */
 570         rxrpc_seq_t             tx_top;         /* Highest Tx slot allocated. */
 571
 572         /* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
 573          * is fixed, we keep these numbers in terms of segments (ie. DATA
 574          * packets) rather than bytes.
 575          */
 576 #define RXRPC_TX_SMSS           RXRPC_JUMBO_DATALEN
 577         u8                      cong_cwnd;      /* Congestion window size */
 578         u8                      cong_extra;     /* Extra to send for congestion management */
 579         u8                      cong_ssthresh;  /* Slow-start threshold */
 580         enum rxrpc_congest_mode cong_mode:8;    /* Congestion management mode */
 581         u8                      cong_dup_acks;  /* Count of ACKs showing missing packets */
 582         u8                      cong_cumul_acks; /* Cumulative ACK count */
 583         ktime_t                 cong_tstamp;    /* Last time cwnd was changed */
 584
 585         rxrpc_seq_t             rx_hard_ack;    /* Dead slot in buffer; the first received but not
 586                                                  * consumed packet follows this.
 587                                                  */
 588         rxrpc_seq_t             rx_top;         /* Highest Rx slot allocated. */
 589         rxrpc_seq_t             rx_expect_next; /* Expected next packet sequence number */
 590         u8                      rx_winsize;     /* Size of Rx window */
 591         u8                      tx_winsize;     /* Maximum size of Tx window */
 592         bool                    tx_phase;       /* T if transmission phase, F if receive phase */
 593         u8                      nr_jumbo_bad;   /* Number of jumbo dups/exceeds-windows */
 594
 595         /* receive-phase ACK management */
 596         u8                      ackr_reason;    /* reason to ACK */
 597         u16                     ackr_skew;      /* skew on packet being ACK'd */
 598         rxrpc_serial_t          ackr_serial;    /* serial of packet being ACK'd */
 599         rxrpc_seq_t             ackr_prev_seq;  /* previous sequence number received */
 600         rxrpc_seq_t             ackr_consumed;  /* Highest packet shown consumed */
 601         rxrpc_seq_t             ackr_seen;      /* Highest packet shown seen */
 602
 603         /* ping management */
 604         rxrpc_serial_t          ping_serial;    /* Last ping sent */
 605         ktime_t                 ping_time;      /* Time last ping sent */
 606
 607         /* transmission-phase ACK management */
 608         ktime_t                 acks_latest_ts; /* Timestamp of latest ACK received */
 609         rxrpc_serial_t          acks_latest;    /* serial number of latest ACK received */
 610         rxrpc_seq_t             acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
 611 };
 612
 613 /*
 614  * Summary of a new ACK and the changes it made to the Tx buffer packet states.
 615  */
 616 struct rxrpc_ack_summary {
 617         u8                      ack_reason;
 618         u8                      nr_acks;                /* Number of ACKs in packet */
 619         u8                      nr_nacks;               /* Number of NACKs in packet */
 620         u8                      nr_new_acks;            /* Number of new ACKs in packet */
 621         u8                      nr_new_nacks;           /* Number of new NACKs in packet */
 622         u8                      nr_rot_new_acks;        /* Number of rotated new ACKs */
 623         bool                    new_low_nack;           /* T if new low NACK found */
 624         bool                    retrans_timeo;          /* T if reTx due to timeout happened */
 625         u8                      flight_size;            /* Number of unreceived transmissions */
 626         /* Place to stash values for tracing */
 627         enum rxrpc_congest_mode mode:8;
 628         u8                      cwnd;
 629         u8                      ssthresh;
 630         u8                      dup_acks;
 631         u8                      cumulative_acks;
 632 };
 633
 634 #include <trace/events/rxrpc.h>
 635
 636 /*
 637  * af_rxrpc.c
 638  */
 639 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
 640 extern atomic_t rxrpc_debug_id;
 641 extern struct workqueue_struct *rxrpc_workqueue;
 642
 643 /*
 644  * call_accept.c
 645  */
 646 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
 647 void rxrpc_discard_prealloc(struct rxrpc_sock *);
 648 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
 649                                            struct rxrpc_connection *,
 650                                            struct sk_buff *);
 651 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
 652 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
 653                                      rxrpc_notify_rx_t);
 654 int rxrpc_reject_call(struct rxrpc_sock *);
 655
 656 /*
 657  * call_event.c
 658  */
 659 void __rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t);
 660 void rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t);
 661 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
 662                        enum rxrpc_propose_ack_trace);
 663 void rxrpc_process_call(struct work_struct *);
 664
 665 /*
 666  * call_object.c
 667  */
 668 extern const char *const rxrpc_call_states[];
 669 extern const char *const rxrpc_call_completions[];
 670 extern unsigned int rxrpc_max_call_lifetime;
 671 extern struct kmem_cache *rxrpc_call_jar;
 672
 673 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
 674 struct rxrpc_call *rxrpc_alloc_call(gfp_t);
 675 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
 676                                          struct rxrpc_conn_parameters *,
 677                                          struct sockaddr_rxrpc *,
 678                                          unsigned long, gfp_t);
 679 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
 680                          struct sk_buff *);
 681 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
 682 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 683 bool __rxrpc_queue_call(struct rxrpc_call *);
 684 bool rxrpc_queue_call(struct rxrpc_call *);
 685 void rxrpc_see_call(struct rxrpc_call *);
 686 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
 687 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
 688 void rxrpc_cleanup_call(struct rxrpc_call *);
 689 void rxrpc_destroy_all_calls(struct rxrpc_net *);
 690
 691 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
 692 {
 693         return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
 694 }
 695
 696 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
 697 {
 698         return !rxrpc_is_service_call(call);
 699 }
 700
 701 /*
 702  * Transition a call to the complete state.
 703  */
 704 static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
 705                                                enum rxrpc_call_completion compl,
 706                                                u32 abort_code,
 707                                                int error)
 708 {
 709         if (call->state < RXRPC_CALL_COMPLETE) {
 710                 call->abort_code = abort_code;
 711                 call->error = error;
 712                 call->completion = compl,
 713                 call->state = RXRPC_CALL_COMPLETE;
 714                 wake_up(&call->waitq);
 715                 return true;
 716         }
 717         return false;
 718 }
 719
 720 static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
 721                                              enum rxrpc_call_completion compl,
 722                                              u32 abort_code,
 723                                              int error)
 724 {
 725         bool ret;
 726
 727         write_lock_bh(&call->state_lock);
 728         ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
 729         write_unlock_bh(&call->state_lock);
 730         return ret;
 731 }
 732
 733 /*
 734  * Record that a call successfully completed.
 735  */
 736 static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
 737 {
 738         return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
 739 }
 740
 741 static inline bool rxrpc_call_completed(struct rxrpc_call *call)
 742 {
 743         bool ret;
 744
 745         write_lock_bh(&call->state_lock);
 746         ret = __rxrpc_call_completed(call);
 747         write_unlock_bh(&call->state_lock);
 748         return ret;
 749 }
 750
 751 /*
 752  * Record that a call is locally aborted.
 753  */
 754 static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 755                                       rxrpc_seq_t seq,
 756                                       u32 abort_code, int error)
 757 {
 758         trace_rxrpc_abort(why, call->cid, call->call_id, seq,
 759                           abort_code, error);
 760         return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
 761                                            abort_code, error);
 762 }
 763
 764 static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 765                                     rxrpc_seq_t seq, u32 abort_code, int error)
 766 {
 767         bool ret;
 768
 769         write_lock_bh(&call->state_lock);
 770         ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
 771         write_unlock_bh(&call->state_lock);
 772         return ret;
 773 }
 774
 775 /*
 776  * Abort a call due to a protocol error.
 777  */
 778 static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
 779                                         struct sk_buff *skb,
 780                                         const char *eproto_why,
 781                                         const char *why,
 782                                         u32 abort_code)
 783 {
 784         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 785
 786         trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
 787         return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
 788 }
 789
 790 #define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
 791         __rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
 792                              (abort_why), (abort_code))
 793
 794 /*
 795  * conn_client.c
 796  */
 797 extern unsigned int rxrpc_max_client_connections;
 798 extern unsigned int rxrpc_reap_client_connections;
 799 extern unsigned int rxrpc_conn_idle_client_expiry;
 800 extern unsigned int rxrpc_conn_idle_client_fast_expiry;
 801 extern struct idr rxrpc_client_conn_ids;
 802
 803 void rxrpc_destroy_client_conn_ids(void);
 804 int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *,
 805                        struct sockaddr_rxrpc *, gfp_t);
 806 void rxrpc_expose_client_call(struct rxrpc_call *);
 807 void rxrpc_disconnect_client_call(struct rxrpc_call *);
 808 void rxrpc_put_client_conn(struct rxrpc_connection *);
 809 void rxrpc_discard_expired_client_conns(struct work_struct *);
 810 void rxrpc_destroy_all_client_connections(struct rxrpc_net *);
 811
 812 /*
 813  * conn_event.c
 814  */
 815 void rxrpc_process_connection(struct work_struct *);
 816
 817 /*
 818  * conn_object.c
 819  */
 820 extern unsigned int rxrpc_connection_expiry;
 821
 822 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
 823 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
 824 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
 825                                                    struct sk_buff *);
 826 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
 827 void rxrpc_disconnect_call(struct rxrpc_call *);
 828 void rxrpc_kill_connection(struct rxrpc_connection *);
 829 bool rxrpc_queue_conn(struct rxrpc_connection *);
 830 void rxrpc_see_connection(struct rxrpc_connection *);
 831 void rxrpc_get_connection(struct rxrpc_connection *);
 832 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
 833 void rxrpc_put_service_conn(struct rxrpc_connection *);
 834 void rxrpc_service_connection_reaper(struct work_struct *);
 835 void rxrpc_destroy_all_connections(struct rxrpc_net *);
 836
 837 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
 838 {
 839         return conn->out_clientflag;
 840 }
 841
 842 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
 843 {
 844         return !rxrpc_conn_is_client(conn);
 845 }
 846
 847 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
 848 {
 849         if (!conn)
 850                 return;
 851
 852         if (rxrpc_conn_is_client(conn))
 853                 rxrpc_put_client_conn(conn);
 854         else
 855                 rxrpc_put_service_conn(conn);
 856 }
 857
 858 /*
 859  * conn_service.c
 860  */
 861 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
 862                                                      struct sk_buff *);
 863 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
 864 void rxrpc_new_incoming_connection(struct rxrpc_connection *, struct sk_buff *);
 865 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
 866
 867 /*
 868  * input.c
 869  */
 870 void rxrpc_data_ready(struct sock *);
 871
 872 /*
 873  * insecure.c
 874  */
 875 extern const struct rxrpc_security rxrpc_no_security;
 876
 877 /*
 878  * key.c
 879  */
 880 extern struct key_type key_type_rxrpc;
 881 extern struct key_type key_type_rxrpc_s;
 882
 883 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
 884 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
 885 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time_t,
 886                               u32);
 887
 888 /*
 889  * local_event.c
 890  */
 891 extern void rxrpc_process_local_events(struct rxrpc_local *);
 892
 893 /*
 894  * local_object.c
 895  */
 896 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
 897 void __rxrpc_put_local(struct rxrpc_local *);
 898 void rxrpc_destroy_all_locals(struct rxrpc_net *);
 899
 900 static inline void rxrpc_get_local(struct rxrpc_local *local)
 901 {
 902         atomic_inc(&local->usage);
 903 }
 904
 905 static inline
 906 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local)
 907 {
 908         return atomic_inc_not_zero(&local->usage) ? local : NULL;
 909 }
 910
 911 static inline void rxrpc_put_local(struct rxrpc_local *local)
 912 {
 913         if (local && atomic_dec_and_test(&local->usage))
 914                 __rxrpc_put_local(local);
 915 }
 916
 917 static inline void rxrpc_queue_local(struct rxrpc_local *local)
 918 {
 919         rxrpc_queue_work(&local->processor);
 920 }
 921
 922 /*
 923  * misc.c
 924  */
 925 extern unsigned int rxrpc_max_backlog __read_mostly;
 926 extern unsigned int rxrpc_requested_ack_delay;
 927 extern unsigned int rxrpc_soft_ack_delay;
 928 extern unsigned int rxrpc_idle_ack_delay;
 929 extern unsigned int rxrpc_rx_window_size;
 930 extern unsigned int rxrpc_rx_mtu;
 931 extern unsigned int rxrpc_rx_jumbo_max;
 932 extern unsigned int rxrpc_resend_timeout;
 933
 934 extern const s8 rxrpc_ack_priority[];
 935
 936 /*
 937  * net_ns.c
 938  */
 939 extern unsigned int rxrpc_net_id;
 940 extern struct pernet_operations rxrpc_net_ops;
 941
 942 static inline struct rxrpc_net *rxrpc_net(struct net *net)
 943 {
 944         return net_generic(net, rxrpc_net_id);
 945 }
 946
 947 /*
 948  * output.c
 949  */
 950 int rxrpc_send_ack_packet(struct rxrpc_call *, bool);
 951 int rxrpc_send_abort_packet(struct rxrpc_call *);
 952 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
 953 void rxrpc_reject_packets(struct rxrpc_local *);
 954
 955 /*
 956  * peer_event.c
 957  */
 958 void rxrpc_error_report(struct sock *);
 959 void rxrpc_peer_error_distributor(struct work_struct *);
 960 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
 961                         rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
 962
 963 /*
 964  * peer_object.c
 965  */
 966 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
 967                                          const struct sockaddr_rxrpc *);
 968 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *,
 969                                      struct sockaddr_rxrpc *, gfp_t);
 970 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
 971 struct rxrpc_peer *rxrpc_lookup_incoming_peer(struct rxrpc_local *,
 972                                               struct rxrpc_peer *);
 973
 974 static inline struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer)
 975 {
 976         atomic_inc(&peer->usage);
 977         return peer;
 978 }
 979
 980 static inline
 981 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer)
 982 {
 983         return atomic_inc_not_zero(&peer->usage) ? peer : NULL;
 984 }
 985
 986 extern void __rxrpc_put_peer(struct rxrpc_peer *peer);
 987 static inline void rxrpc_put_peer(struct rxrpc_peer *peer)
 988 {
 989         if (peer && atomic_dec_and_test(&peer->usage))
 990                 __rxrpc_put_peer(peer);
 991 }
 992
 993 /*
 994  * proc.c
 995  */
 996 extern const struct file_operations rxrpc_call_seq_fops;
 997 extern const struct file_operations rxrpc_connection_seq_fops;
 998
 999 /*
1000  * recvmsg.c
1001  */
1002 void rxrpc_notify_socket(struct rxrpc_call *);
1003 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1004
1005 /*
1006  * rxkad.c
1007  */
1008 #ifdef CONFIG_RXKAD
1009 extern const struct rxrpc_security rxkad;
1010 #endif
1011
1012 /*
1013  * security.c
1014  */
1015 int __init rxrpc_init_security(void);
1016 void rxrpc_exit_security(void);
1017 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1018 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
1019
1020 /*
1021  * sendmsg.c
1022  */
1023 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1024
1025 /*
1026  * skbuff.c
1027  */
1028 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1029 void rxrpc_packet_destructor(struct sk_buff *);
1030 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1031 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1032 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1033 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1034 void rxrpc_lose_skb(struct sk_buff *, enum rxrpc_skb_trace);
1035 void rxrpc_purge_queue(struct sk_buff_head *);
1036
1037 /*
1038  * sysctl.c
1039  */
1040 #ifdef CONFIG_SYSCTL
1041 extern int __init rxrpc_sysctl_init(void);
1042 extern void rxrpc_sysctl_exit(void);
1043 #else
1044 static inline int __init rxrpc_sysctl_init(void) { return 0; }
1045 static inline void rxrpc_sysctl_exit(void) {}
1046 #endif
1047
1048 /*
1049  * utils.c
1050  */
1051 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1052
1053 static inline bool before(u32 seq1, u32 seq2)
1054 {
1055         return (s32)(seq1 - seq2) < 0;
1056 }
1057 static inline bool before_eq(u32 seq1, u32 seq2)
1058 {
1059         return (s32)(seq1 - seq2) <= 0;
1060 }
1061 static inline bool after(u32 seq1, u32 seq2)
1062 {
1063         return (s32)(seq1 - seq2) > 0;
1064 }
1065 static inline bool after_eq(u32 seq1, u32 seq2)
1066 {
1067         return (s32)(seq1 - seq2) >= 0;
1068 }
1069
1070 /*
1071  * debug tracing
1072  */
1073 extern unsigned int rxrpc_debug;
1074
1075 #define dbgprintk(FMT,...) \
1076         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1077
1078 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1079 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1080 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
1081 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
1082 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1083
1084
1085 #if defined(__KDEBUG)
1086 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1087 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1088 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1089 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
1090 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
1091
1092 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1093 #define RXRPC_DEBUG_KENTER      0x01
1094 #define RXRPC_DEBUG_KLEAVE      0x02
1095 #define RXRPC_DEBUG_KDEBUG      0x04
1096 #define RXRPC_DEBUG_KPROTO      0x08
1097 #define RXRPC_DEBUG_KNET        0x10
1098
1099 #define _enter(FMT,...)                                 \
1100 do {                                                    \
1101         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1102                 kenter(FMT,##__VA_ARGS__);              \
1103 } while (0)
1104
1105 #define _leave(FMT,...)                                 \
1106 do {                                                    \
1107         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1108                 kleave(FMT,##__VA_ARGS__);              \
1109 } while (0)
1110
1111 #define _debug(FMT,...)                                 \
1112 do {                                                    \
1113         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1114                 kdebug(FMT,##__VA_ARGS__);              \
1115 } while (0)
1116
1117 #define _proto(FMT,...)                                 \
1118 do {                                                    \
1119         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
1120                 kproto(FMT,##__VA_ARGS__);              \
1121 } while (0)
1122
1123 #define _net(FMT,...)                                   \
1124 do {                                                    \
1125         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
1126                 knet(FMT,##__VA_ARGS__);                \
1127 } while (0)
1128
1129 #else
1130 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1131 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1132 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
1133 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
1134 #define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
1135 #endif
1136
1137 /*
1138  * debug assertion checking
1139  */
1140 #if 1 // defined(__KDEBUGALL)
1141
1142 #define ASSERT(X)                                               \
1143 do {                                                            \
1144         if (unlikely(!(X))) {                                   \
1145                 pr_err("Assertion failed\n");                   \
1146                 BUG();                                          \
1147         }                                                       \
1148 } while (0)
1149
1150 #define ASSERTCMP(X, OP, Y)                                             \
1151 do {                                                                    \
1152         __typeof__(X) _x = (X);                                         \
1153         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1154         if (unlikely(!(_x OP _y))) {                                    \
1155                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1156                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1157                        (unsigned long)_y, (unsigned long)_y);           \
1158                 BUG();                                                  \
1159         }                                                               \
1160 } while (0)
1161
1162 #define ASSERTIF(C, X)                                          \
1163 do {                                                            \
1164         if (unlikely((C) && !(X))) {                            \
1165                 pr_err("Assertion failed\n");                   \
1166                 BUG();                                          \
1167         }                                                       \
1168 } while (0)
1169
1170 #define ASSERTIFCMP(C, X, OP, Y)                                        \
1171 do {                                                                    \
1172         __typeof__(X) _x = (X);                                         \
1173         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1174         if (unlikely((C) && !(_x OP _y))) {                             \
1175                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1176                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1177                        (unsigned long)_y, (unsigned long)_y);           \
1178                 BUG();                                                  \
1179         }                                                               \
1180 } while (0)
1181
1182 #else
1183
1184 #define ASSERT(X)                               \
1185 do {                                            \
1186 } while (0)
1187
1188 #define ASSERTCMP(X, OP, Y)                     \
1189 do {                                            \
1190 } while (0)
1191
1192 #define ASSERTIF(C, X)                          \
1193 do {                                            \
1194 } while (0)
1195
1196 #define ASSERTIFCMP(C, X, OP, Y)                \
1197 do {                                            \
1198 } while (0)
1199
1200 #endif /* __KDEBUGALL */