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/sock.h>
  15 #include <net/af_rxrpc.h>
  16 #include <rxrpc/packet.h>
  17
  18 #if 0
  19 #define CHECK_SLAB_OKAY(X)                                   \
  20         BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
  21                (POISON_FREE << 8 | POISON_FREE))
  22 #else
  23 #define CHECK_SLAB_OKAY(X) do {} while (0)
  24 #endif
  25
  26 #define FCRYPT_BSIZE 8
  27 struct rxrpc_crypt {
  28         union {
  29                 u8      x[FCRYPT_BSIZE];
  30                 __be32  n[2];
  31         };
  32 } __attribute__((aligned(8)));
  33
  34 #define rxrpc_queue_work(WS)    queue_work(rxrpc_workqueue, (WS))
  35 #define rxrpc_queue_delayed_work(WS,D)  \
  36         queue_delayed_work(rxrpc_workqueue, (WS), (D))
  37
  38 struct rxrpc_connection;
  39
  40 /*
  41  * Mark applied to socket buffers.
  42  */
  43 enum rxrpc_skb_mark {
  44         RXRPC_SKB_MARK_DATA,            /* data message */
  45         RXRPC_SKB_MARK_FINAL_ACK,       /* final ACK received message */
  46         RXRPC_SKB_MARK_BUSY,            /* server busy message */
  47         RXRPC_SKB_MARK_REMOTE_ABORT,    /* remote abort message */
  48         RXRPC_SKB_MARK_LOCAL_ABORT,     /* local abort message */
  49         RXRPC_SKB_MARK_NET_ERROR,       /* network error message */
  50         RXRPC_SKB_MARK_LOCAL_ERROR,     /* local error message */
  51         RXRPC_SKB_MARK_NEW_CALL,        /* local error message */
  52 };
  53
  54 /*
  55  * sk_state for RxRPC sockets
  56  */
  57 enum {
  58         RXRPC_UNBOUND = 0,
  59         RXRPC_CLIENT_UNBOUND,           /* Unbound socket used as client */
  60         RXRPC_CLIENT_BOUND,             /* client local address bound */
  61         RXRPC_SERVER_BOUND,             /* server local address bound */
  62         RXRPC_SERVER_LISTENING,         /* server listening for connections */
  63         RXRPC_CLOSE,                    /* socket is being closed */
  64 };
  65
  66 /*
  67  * Service backlog preallocation.
  68  *
  69  * This contains circular buffers of preallocated peers, connections and calls
  70  * for incoming service calls and their head and tail pointers.  This allows
  71  * calls to be set up in the data_ready handler, thereby avoiding the need to
  72  * shuffle packets around so much.
  73  */
  74 struct rxrpc_backlog {
  75         unsigned short          peer_backlog_head;
  76         unsigned short          peer_backlog_tail;
  77         unsigned short          conn_backlog_head;
  78         unsigned short          conn_backlog_tail;
  79         unsigned short          call_backlog_head;
  80         unsigned short          call_backlog_tail;
  81 #define RXRPC_BACKLOG_MAX       32
  82         struct rxrpc_peer       *peer_backlog[RXRPC_BACKLOG_MAX];
  83         struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
  84         struct rxrpc_call       *call_backlog[RXRPC_BACKLOG_MAX];
  85 };
  86
  87 /*
  88  * RxRPC socket definition
  89  */
  90 struct rxrpc_sock {
  91         /* WARNING: sk has to be the first member */
  92         struct sock             sk;
  93         rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
  94         rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
  95         struct rxrpc_local      *local;         /* local endpoint */
  96         struct rxrpc_backlog    *backlog;       /* Preallocation for services */
  97         spinlock_t              incoming_lock;  /* Incoming call vs service shutdown lock */
  98         struct list_head        sock_calls;     /* List of calls owned by this socket */
  99         struct list_head        to_be_accepted; /* calls awaiting acceptance */
 100         struct list_head        recvmsg_q;      /* Calls awaiting recvmsg's attention  */
 101         rwlock_t                recvmsg_lock;   /* Lock for recvmsg_q */
 102         struct key              *key;           /* security for this socket */
 103         struct key              *securities;    /* list of server security descriptors */
 104         struct rb_root          calls;          /* User ID -> call mapping */
 105         unsigned long           flags;
 106 #define RXRPC_SOCK_CONNECTED            0       /* connect_srx is set */
 107         rwlock_t                call_lock;      /* lock for calls */
 108         u32                     min_sec_level;  /* minimum security level */
 109 #define RXRPC_SECURITY_MAX      RXRPC_SECURITY_ENCRYPT
 110         bool                    exclusive;      /* Exclusive connection for a client socket */
 111         sa_family_t             family;         /* Protocol family created with */
 112         struct sockaddr_rxrpc   srx;            /* local address */
 113         struct sockaddr_rxrpc   connect_srx;    /* Default client address from connect() */
 114 };
 115
 116 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
 117
 118 /*
 119  * CPU-byteorder normalised Rx packet header.
 120  */
 121 struct rxrpc_host_header {
 122         u32             epoch;          /* client boot timestamp */
 123         u32             cid;            /* connection and channel ID */
 124         u32             callNumber;     /* call ID (0 for connection-level packets) */
 125         u32             seq;            /* sequence number of pkt in call stream */
 126         u32             serial;         /* serial number of pkt sent to network */
 127         u8              type;           /* packet type */
 128         u8              flags;          /* packet flags */
 129         u8              userStatus;     /* app-layer defined status */
 130         u8              securityIndex;  /* security protocol ID */
 131         union {
 132                 u16     _rsvd;          /* reserved */
 133                 u16     cksum;          /* kerberos security checksum */
 134         };
 135         u16             serviceId;      /* service ID */
 136 } __packed;
 137
 138 /*
 139  * RxRPC socket buffer private variables
 140  * - max 48 bytes (struct sk_buff::cb)
 141  */
 142 struct rxrpc_skb_priv {
 143         union {
 144                 u8              nr_jumbo;       /* Number of jumbo subpackets */
 145         };
 146         union {
 147                 unsigned int    offset;         /* offset into buffer of next read */
 148                 int             remain;         /* amount of space remaining for next write */
 149                 u32             error;          /* network error code */
 150         };
 151
 152         struct rxrpc_host_header hdr;           /* RxRPC packet header from this packet */
 153 };
 154
 155 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
 156
 157 /*
 158  * RxRPC security module interface
 159  */
 160 struct rxrpc_security {
 161         const char              *name;          /* name of this service */
 162         u8                      security_index; /* security type provided */
 163
 164         /* Initialise a security service */
 165         int (*init)(void);
 166
 167         /* Clean up a security service */
 168         void (*exit)(void);
 169
 170         /* initialise a connection's security */
 171         int (*init_connection_security)(struct rxrpc_connection *);
 172
 173         /* prime a connection's packet security */
 174         int (*prime_packet_security)(struct rxrpc_connection *);
 175
 176         /* impose security on a packet */
 177         int (*secure_packet)(struct rxrpc_call *,
 178                              struct sk_buff *,
 179                              size_t,
 180                              void *);
 181
 182         /* verify the security on a received packet */
 183         int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
 184                              unsigned int, unsigned int, rxrpc_seq_t, u16);
 185
 186         /* Locate the data in a received packet that has been verified. */
 187         void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
 188                             unsigned int *, unsigned int *);
 189
 190         /* issue a challenge */
 191         int (*issue_challenge)(struct rxrpc_connection *);
 192
 193         /* respond to a challenge */
 194         int (*respond_to_challenge)(struct rxrpc_connection *,
 195                                     struct sk_buff *,
 196                                     u32 *);
 197
 198         /* verify a response */
 199         int (*verify_response)(struct rxrpc_connection *,
 200                                struct sk_buff *,
 201                                u32 *);
 202
 203         /* clear connection security */
 204         void (*clear)(struct rxrpc_connection *);
 205 };
 206
 207 /*
 208  * RxRPC local transport endpoint description
 209  * - owned by a single AF_RXRPC socket
 210  * - pointed to by transport socket struct sk_user_data
 211  */
 212 struct rxrpc_local {
 213         struct rcu_head         rcu;
 214         atomic_t                usage;
 215         struct list_head        link;
 216         struct socket           *socket;        /* my UDP socket */
 217         struct work_struct      processor;
 218         struct rxrpc_sock __rcu *service;       /* Service(s) listening on this endpoint */
 219         struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
 220         struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
 221         struct sk_buff_head     event_queue;    /* endpoint event packets awaiting processing */
 222         struct rb_root          client_conns;   /* Client connections by socket params */
 223         spinlock_t              client_conns_lock; /* Lock for client_conns */
 224         spinlock_t              lock;           /* access lock */
 225         rwlock_t                services_lock;  /* lock for services list */
 226         int                     debug_id;       /* debug ID for printks */
 227         bool                    dead;
 228         struct sockaddr_rxrpc   srx;            /* local address */
 229 };
 230
 231 /*
 232  * RxRPC remote transport endpoint definition
 233  * - matched by local endpoint, remote port, address and protocol type
 234  */
 235 struct rxrpc_peer {
 236         struct rcu_head         rcu;            /* This must be first */
 237         atomic_t                usage;
 238         unsigned long           hash_key;
 239         struct hlist_node       hash_link;
 240         struct rxrpc_local      *local;
 241         struct hlist_head       error_targets;  /* targets for net error distribution */
 242         struct work_struct      error_distributor;
 243         struct rb_root          service_conns;  /* Service connections */
 244         seqlock_t               service_conn_lock;
 245         spinlock_t              lock;           /* access lock */
 246         unsigned int            if_mtu;         /* interface MTU for this peer */
 247         unsigned int            mtu;            /* network MTU for this peer */
 248         unsigned int            maxdata;        /* data size (MTU - hdrsize) */
 249         unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
 250         int                     debug_id;       /* debug ID for printks */
 251         int                     error_report;   /* Net (+0) or local (+1000000) to distribute */
 252 #define RXRPC_LOCAL_ERROR_OFFSET 1000000
 253         struct sockaddr_rxrpc   srx;            /* remote address */
 254
 255         /* calculated RTT cache */
 256 #define RXRPC_RTT_CACHE_SIZE 32
 257         ktime_t                 rtt_last_req;   /* Time of last RTT request */
 258         u64                     rtt;            /* Current RTT estimate (in nS) */
 259         u64                     rtt_sum;        /* Sum of cache contents */
 260         u64                     rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */
 261         u8                      rtt_cursor;     /* next entry at which to insert */
 262         u8                      rtt_usage;      /* amount of cache actually used */
 263 };
 264
 265 /*
 266  * Keys for matching a connection.
 267  */
 268 struct rxrpc_conn_proto {
 269         union {
 270                 struct {
 271                         u32     epoch;          /* epoch of this connection */
 272                         u32     cid;            /* connection ID */
 273                 };
 274                 u64             index_key;
 275         };
 276 };
 277
 278 struct rxrpc_conn_parameters {
 279         struct rxrpc_local      *local;         /* Representation of local endpoint */
 280         struct rxrpc_peer       *peer;          /* Remote endpoint */
 281         struct key              *key;           /* Security details */
 282         bool                    exclusive;      /* T if conn is exclusive */
 283         u16                     service_id;     /* Service ID for this connection */
 284         u32                     security_level; /* Security level selected */
 285 };
 286
 287 /*
 288  * Bits in the connection flags.
 289  */
 290 enum rxrpc_conn_flag {
 291         RXRPC_CONN_HAS_IDR,             /* Has a client conn ID assigned */
 292         RXRPC_CONN_IN_SERVICE_CONNS,    /* Conn is in peer->service_conns */
 293         RXRPC_CONN_IN_CLIENT_CONNS,     /* Conn is in local->client_conns */
 294         RXRPC_CONN_EXPOSED,             /* Conn has extra ref for exposure */
 295         RXRPC_CONN_DONT_REUSE,          /* Don't reuse this connection */
 296         RXRPC_CONN_COUNTED,             /* Counted by rxrpc_nr_client_conns */
 297 };
 298
 299 /*
 300  * Events that can be raised upon a connection.
 301  */
 302 enum rxrpc_conn_event {
 303         RXRPC_CONN_EV_CHALLENGE,        /* Send challenge packet */
 304 };
 305
 306 /*
 307  * The connection cache state.
 308  */
 309 enum rxrpc_conn_cache_state {
 310         RXRPC_CONN_CLIENT_INACTIVE,     /* Conn is not yet listed */
 311         RXRPC_CONN_CLIENT_WAITING,      /* Conn is on wait list, waiting for capacity */
 312         RXRPC_CONN_CLIENT_ACTIVE,       /* Conn is on active list, doing calls */
 313         RXRPC_CONN_CLIENT_CULLED,       /* Conn is culled and delisted, doing calls */
 314         RXRPC_CONN_CLIENT_IDLE,         /* Conn is on idle list, doing mostly nothing */
 315         RXRPC_CONN__NR_CACHE_STATES
 316 };
 317
 318 /*
 319  * The connection protocol state.
 320  */
 321 enum rxrpc_conn_proto_state {
 322         RXRPC_CONN_UNUSED,              /* Connection not yet attempted */
 323         RXRPC_CONN_CLIENT,              /* Client connection */
 324         RXRPC_CONN_SERVICE_PREALLOC,    /* Service connection preallocation */
 325         RXRPC_CONN_SERVICE_UNSECURED,   /* Service unsecured connection */
 326         RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
 327         RXRPC_CONN_SERVICE,             /* Service secured connection */
 328         RXRPC_CONN_REMOTELY_ABORTED,    /* Conn aborted by peer */
 329         RXRPC_CONN_LOCALLY_ABORTED,     /* Conn aborted locally */
 330         RXRPC_CONN__NR_STATES
 331 };
 332
 333 /*
 334  * RxRPC connection definition
 335  * - matched by { local, peer, epoch, conn_id, direction }
 336  * - each connection can only handle four simultaneous calls
 337  */
 338 struct rxrpc_connection {
 339         struct rxrpc_conn_proto proto;
 340         struct rxrpc_conn_parameters params;
 341
 342         atomic_t                usage;
 343         struct rcu_head         rcu;
 344         struct list_head        cache_link;
 345
 346         spinlock_t              channel_lock;
 347         unsigned char           active_chans;   /* Mask of active channels */
 348 #define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1)
 349         struct list_head        waiting_calls;  /* Calls waiting for channels */
 350         struct rxrpc_channel {
 351                 struct rxrpc_call __rcu *call;          /* Active call */
 352                 u32                     call_id;        /* ID of current call */
 353                 u32                     call_counter;   /* Call ID counter */
 354                 u32                     last_call;      /* ID of last call */
 355                 u8                      last_type;      /* Type of last packet */
 356                 u16                     last_service_id;
 357                 union {
 358                         u32             last_seq;
 359                         u32             last_abort;
 360                 };
 361         } channels[RXRPC_MAXCALLS];
 362
 363         struct work_struct      processor;      /* connection event processor */
 364         union {
 365                 struct rb_node  client_node;    /* Node in local->client_conns */
 366                 struct rb_node  service_node;   /* Node in peer->service_conns */
 367         };
 368         struct list_head        proc_link;      /* link in procfs list */
 369         struct list_head        link;           /* link in master connection list */
 370         struct sk_buff_head     rx_queue;       /* received conn-level packets */
 371         const struct rxrpc_security *security;  /* applied security module */
 372         struct key              *server_key;    /* security for this service */
 373         struct crypto_skcipher  *cipher;        /* encryption handle */
 374         struct rxrpc_crypt      csum_iv;        /* packet checksum base */
 375         unsigned long           flags;
 376         unsigned long           events;
 377         unsigned long           idle_timestamp; /* Time at which last became idle */
 378         spinlock_t              state_lock;     /* state-change lock */
 379         enum rxrpc_conn_cache_state cache_state;
 380         enum rxrpc_conn_proto_state state;      /* current state of connection */
 381         u32                     local_abort;    /* local abort code */
 382         u32                     remote_abort;   /* remote abort code */
 383         int                     debug_id;       /* debug ID for printks */
 384         atomic_t                serial;         /* packet serial number counter */
 385         unsigned int            hi_serial;      /* highest serial number received */
 386         u32                     security_nonce; /* response re-use preventer */
 387         u8                      size_align;     /* data size alignment (for security) */
 388         u8                      security_size;  /* security header size */
 389         u8                      security_ix;    /* security type */
 390         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
 391 };
 392
 393 /*
 394  * Flags in call->flags.
 395  */
 396 enum rxrpc_call_flag {
 397         RXRPC_CALL_RELEASED,            /* call has been released - no more message to userspace */
 398         RXRPC_CALL_HAS_USERID,          /* has a user ID attached */
 399         RXRPC_CALL_IS_SERVICE,          /* Call is service call */
 400         RXRPC_CALL_EXPOSED,             /* The call was exposed to the world */
 401         RXRPC_CALL_RX_LAST,             /* Received the last packet (at rxtx_top) */
 402         RXRPC_CALL_TX_LAST,             /* Last packet in Tx buffer (at rxtx_top) */
 403         RXRPC_CALL_PINGING,             /* Ping in process */
 404         RXRPC_CALL_RETRANS_TIMEOUT,     /* Retransmission due to timeout occurred */
 405 };
 406
 407 /*
 408  * Events that can be raised on a call.
 409  */
 410 enum rxrpc_call_event {
 411         RXRPC_CALL_EV_ACK,              /* need to generate ACK */
 412         RXRPC_CALL_EV_ABORT,            /* need to generate abort */
 413         RXRPC_CALL_EV_TIMER,            /* Timer expired */
 414         RXRPC_CALL_EV_RESEND,           /* Tx resend required */
 415 };
 416
 417 /*
 418  * The states that a call can be in.
 419  */
 420 enum rxrpc_call_state {
 421         RXRPC_CALL_UNINITIALISED,
 422         RXRPC_CALL_CLIENT_AWAIT_CONN,   /* - client waiting for connection to become available */
 423         RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
 424         RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
 425         RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
 426         RXRPC_CALL_SERVER_PREALLOC,     /* - service preallocation */
 427         RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
 428         RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
 429         RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
 430         RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
 431         RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
 432         RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
 433         RXRPC_CALL_COMPLETE,            /* - call complete */
 434         NR__RXRPC_CALL_STATES
 435 };
 436
 437 /*
 438  * Call completion condition (state == RXRPC_CALL_COMPLETE).
 439  */
 440 enum rxrpc_call_completion {
 441         RXRPC_CALL_SUCCEEDED,           /* - Normal termination */
 442         RXRPC_CALL_REMOTELY_ABORTED,    /* - call aborted by peer */
 443         RXRPC_CALL_LOCALLY_ABORTED,     /* - call aborted locally on error or close */
 444         RXRPC_CALL_LOCAL_ERROR,         /* - call failed due to local error */
 445         RXRPC_CALL_NETWORK_ERROR,       /* - call terminated by network error */
 446         NR__RXRPC_CALL_COMPLETIONS
 447 };
 448
 449 /*
 450  * Call Tx congestion management modes.
 451  */
 452 enum rxrpc_congest_mode {
 453         RXRPC_CALL_SLOW_START,
 454         RXRPC_CALL_CONGEST_AVOIDANCE,
 455         RXRPC_CALL_PACKET_LOSS,
 456         RXRPC_CALL_FAST_RETRANSMIT,
 457         NR__RXRPC_CONGEST_MODES
 458 };
 459
 460 /*
 461  * RxRPC call definition
 462  * - matched by { connection, call_id }
 463  */
 464 struct rxrpc_call {
 465         struct rcu_head         rcu;
 466         struct rxrpc_connection *conn;          /* connection carrying call */
 467         struct rxrpc_peer       *peer;          /* Peer record for remote address */
 468         struct rxrpc_sock __rcu *socket;        /* socket responsible */
 469         unsigned long           ack_at;         /* When deferred ACK needs to happen */
 470         unsigned long           resend_at;      /* When next resend needs to happen */
 471         unsigned long           expire_at;      /* When the call times out */
 472         struct timer_list       timer;          /* Combined event timer */
 473         struct work_struct      processor;      /* Event processor */
 474         rxrpc_notify_rx_t       notify_rx;      /* kernel service Rx notification function */
 475         struct list_head        link;           /* link in master call list */
 476         struct list_head        chan_wait_link; /* Link in conn->waiting_calls */
 477         struct hlist_node       error_link;     /* link in error distribution list */
 478         struct list_head        accept_link;    /* Link in rx->acceptq */
 479         struct list_head        recvmsg_link;   /* Link in rx->recvmsg_q */
 480         struct list_head        sock_link;      /* Link in rx->sock_calls */
 481         struct rb_node          sock_node;      /* Node in rx->calls */
 482         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
 483         wait_queue_head_t       waitq;          /* Wait queue for channel or Tx */
 484         __be32                  crypto_buf[2];  /* Temporary packet crypto buffer */
 485         unsigned long           user_call_ID;   /* user-defined call ID */
 486         unsigned long           flags;
 487         unsigned long           events;
 488         spinlock_t              lock;
 489         rwlock_t                state_lock;     /* lock for state transition */
 490         u32                     abort_code;     /* Local/remote abort code */
 491         int                     error;          /* Local error incurred */
 492         enum rxrpc_call_state   state;          /* current state of call */
 493         enum rxrpc_call_completion completion;  /* Call completion condition */
 494         atomic_t                usage;
 495         u16                     service_id;     /* service ID */
 496         u8                      security_ix;    /* Security type */
 497         u32                     call_id;        /* call ID on connection  */
 498         u32                     cid;            /* connection ID plus channel index */
 499         int                     debug_id;       /* debug ID for printks */
 500         unsigned short          rx_pkt_offset;  /* Current recvmsg packet offset */
 501         unsigned short          rx_pkt_len;     /* Current recvmsg packet len */
 502
 503         /* Rx/Tx circular buffer, depending on phase.
 504          *
 505          * In the Rx phase, packets are annotated with 0 or the number of the
 506          * segment of a jumbo packet each buffer refers to.  There can be up to
 507          * 47 segments in a maximum-size UDP packet.
 508          *
 509          * In the Tx phase, packets are annotated with which buffers have been
 510          * acked.
 511          */
 512 #define RXRPC_RXTX_BUFF_SIZE    64
 513 #define RXRPC_RXTX_BUFF_MASK    (RXRPC_RXTX_BUFF_SIZE - 1)
 514 #define RXRPC_INIT_RX_WINDOW_SIZE 32
 515         struct sk_buff          **rxtx_buffer;
 516         u8                      *rxtx_annotations;
 517 #define RXRPC_TX_ANNO_ACK       0
 518 #define RXRPC_TX_ANNO_UNACK     1
 519 #define RXRPC_TX_ANNO_NAK       2
 520 #define RXRPC_TX_ANNO_RETRANS   3
 521 #define RXRPC_TX_ANNO_MASK      0x03
 522 #define RXRPC_TX_ANNO_LAST      0x04
 523 #define RXRPC_TX_ANNO_RESENT    0x08
 524
 525 #define RXRPC_RX_ANNO_JUMBO     0x3f            /* Jumbo subpacket number + 1 if not zero */
 526 #define RXRPC_RX_ANNO_JLAST     0x40            /* Set if last element of a jumbo packet */
 527 #define RXRPC_RX_ANNO_VERIFIED  0x80            /* Set if verified and decrypted */
 528         rxrpc_seq_t             tx_hard_ack;    /* Dead slot in buffer; the first transmitted but
 529                                                  * not hard-ACK'd packet follows this.
 530                                                  */
 531         rxrpc_seq_t             tx_top;         /* Highest Tx slot allocated. */
 532
 533         /* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
 534          * is fixed, we keep these numbers in terms of segments (ie. DATA
 535          * packets) rather than bytes.
 536          */
 537 #define RXRPC_TX_SMSS           RXRPC_JUMBO_DATALEN
 538         u8                      cong_cwnd;      /* Congestion window size */
 539         u8                      cong_extra;     /* Extra to send for congestion management */
 540         u8                      cong_ssthresh;  /* Slow-start threshold */
 541         enum rxrpc_congest_mode cong_mode:8;    /* Congestion management mode */
 542         u8                      cong_dup_acks;  /* Count of ACKs showing missing packets */
 543         u8                      cong_cumul_acks; /* Cumulative ACK count */
 544         ktime_t                 cong_tstamp;    /* Last time cwnd was changed */
 545
 546         rxrpc_seq_t             rx_hard_ack;    /* Dead slot in buffer; the first received but not
 547                                                  * consumed packet follows this.
 548                                                  */
 549         rxrpc_seq_t             rx_top;         /* Highest Rx slot allocated. */
 550         rxrpc_seq_t             rx_expect_next; /* Expected next packet sequence number */
 551         u8                      rx_winsize;     /* Size of Rx window */
 552         u8                      tx_winsize;     /* Maximum size of Tx window */
 553         bool                    tx_phase;       /* T if transmission phase, F if receive phase */
 554         u8                      nr_jumbo_bad;   /* Number of jumbo dups/exceeds-windows */
 555
 556         /* receive-phase ACK management */
 557         u8                      ackr_reason;    /* reason to ACK */
 558         u16                     ackr_skew;      /* skew on packet being ACK'd */
 559         rxrpc_serial_t          ackr_serial;    /* serial of packet being ACK'd */
 560         rxrpc_seq_t             ackr_prev_seq;  /* previous sequence number received */
 561         rxrpc_seq_t             ackr_consumed;  /* Highest packet shown consumed */
 562         rxrpc_seq_t             ackr_seen;      /* Highest packet shown seen */
 563         rxrpc_serial_t          ackr_ping;      /* Last ping sent */
 564         ktime_t                 ackr_ping_time; /* Time last ping sent */
 565
 566         /* transmission-phase ACK management */
 567         ktime_t                 acks_latest_ts; /* Timestamp of latest ACK received */
 568         rxrpc_serial_t          acks_latest;    /* serial number of latest ACK received */
 569         rxrpc_seq_t             acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
 570 };
 571
 572 /*
 573  * Summary of a new ACK and the changes it made to the Tx buffer packet states.
 574  */
 575 struct rxrpc_ack_summary {
 576         u8                      ack_reason;
 577         u8                      nr_acks;                /* Number of ACKs in packet */
 578         u8                      nr_nacks;               /* Number of NACKs in packet */
 579         u8                      nr_new_acks;            /* Number of new ACKs in packet */
 580         u8                      nr_new_nacks;           /* Number of new NACKs in packet */
 581         u8                      nr_rot_new_acks;        /* Number of rotated new ACKs */
 582         bool                    new_low_nack;           /* T if new low NACK found */
 583         bool                    retrans_timeo;          /* T if reTx due to timeout happened */
 584         u8                      flight_size;            /* Number of unreceived transmissions */
 585         /* Place to stash values for tracing */
 586         enum rxrpc_congest_mode mode:8;
 587         u8                      cwnd;
 588         u8                      ssthresh;
 589         u8                      dup_acks;
 590         u8                      cumulative_acks;
 591 };
 592
 593 enum rxrpc_skb_trace {
 594         rxrpc_skb_rx_cleaned,
 595         rxrpc_skb_rx_freed,
 596         rxrpc_skb_rx_got,
 597         rxrpc_skb_rx_lost,
 598         rxrpc_skb_rx_received,
 599         rxrpc_skb_rx_rotated,
 600         rxrpc_skb_rx_purged,
 601         rxrpc_skb_rx_seen,
 602         rxrpc_skb_tx_cleaned,
 603         rxrpc_skb_tx_freed,
 604         rxrpc_skb_tx_got,
 605         rxrpc_skb_tx_new,
 606         rxrpc_skb_tx_rotated,
 607         rxrpc_skb_tx_seen,
 608         rxrpc_skb__nr_trace
 609 };
 610
 611 extern const char rxrpc_skb_traces[rxrpc_skb__nr_trace][7];
 612
 613 enum rxrpc_conn_trace {
 614         rxrpc_conn_new_client,
 615         rxrpc_conn_new_service,
 616         rxrpc_conn_queued,
 617         rxrpc_conn_seen,
 618         rxrpc_conn_got,
 619         rxrpc_conn_put_client,
 620         rxrpc_conn_put_service,
 621         rxrpc_conn__nr_trace
 622 };
 623
 624 extern const char rxrpc_conn_traces[rxrpc_conn__nr_trace][4];
 625
 626 enum rxrpc_client_trace {
 627         rxrpc_client_activate_chans,
 628         rxrpc_client_alloc,
 629         rxrpc_client_chan_activate,
 630         rxrpc_client_chan_disconnect,
 631         rxrpc_client_chan_pass,
 632         rxrpc_client_chan_unstarted,
 633         rxrpc_client_cleanup,
 634         rxrpc_client_count,
 635         rxrpc_client_discard,
 636         rxrpc_client_duplicate,
 637         rxrpc_client_exposed,
 638         rxrpc_client_replace,
 639         rxrpc_client_to_active,
 640         rxrpc_client_to_culled,
 641         rxrpc_client_to_idle,
 642         rxrpc_client_to_inactive,
 643         rxrpc_client_to_waiting,
 644         rxrpc_client_uncount,
 645         rxrpc_client__nr_trace
 646 };
 647
 648 extern const char rxrpc_client_traces[rxrpc_client__nr_trace][7];
 649 extern const char rxrpc_conn_cache_states[RXRPC_CONN__NR_CACHE_STATES][5];
 650
 651 enum rxrpc_call_trace {
 652         rxrpc_call_new_client,
 653         rxrpc_call_new_service,
 654         rxrpc_call_queued,
 655         rxrpc_call_queued_ref,
 656         rxrpc_call_seen,
 657         rxrpc_call_connected,
 658         rxrpc_call_release,
 659         rxrpc_call_got,
 660         rxrpc_call_got_userid,
 661         rxrpc_call_got_kernel,
 662         rxrpc_call_put,
 663         rxrpc_call_put_userid,
 664         rxrpc_call_put_kernel,
 665         rxrpc_call_put_noqueue,
 666         rxrpc_call_error,
 667         rxrpc_call__nr_trace
 668 };
 669
 670 extern const char rxrpc_call_traces[rxrpc_call__nr_trace][4];
 671
 672 enum rxrpc_transmit_trace {
 673         rxrpc_transmit_wait,
 674         rxrpc_transmit_queue,
 675         rxrpc_transmit_queue_last,
 676         rxrpc_transmit_rotate,
 677         rxrpc_transmit_rotate_last,
 678         rxrpc_transmit_await_reply,
 679         rxrpc_transmit_end,
 680         rxrpc_transmit__nr_trace
 681 };
 682
 683 extern const char rxrpc_transmit_traces[rxrpc_transmit__nr_trace][4];
 684
 685 enum rxrpc_receive_trace {
 686         rxrpc_receive_incoming,
 687         rxrpc_receive_queue,
 688         rxrpc_receive_queue_last,
 689         rxrpc_receive_front,
 690         rxrpc_receive_rotate,
 691         rxrpc_receive_end,
 692         rxrpc_receive__nr_trace
 693 };
 694
 695 extern const char rxrpc_receive_traces[rxrpc_receive__nr_trace][4];
 696
 697 enum rxrpc_recvmsg_trace {
 698         rxrpc_recvmsg_enter,
 699         rxrpc_recvmsg_wait,
 700         rxrpc_recvmsg_dequeue,
 701         rxrpc_recvmsg_hole,
 702         rxrpc_recvmsg_next,
 703         rxrpc_recvmsg_cont,
 704         rxrpc_recvmsg_full,
 705         rxrpc_recvmsg_data_return,
 706         rxrpc_recvmsg_terminal,
 707         rxrpc_recvmsg_to_be_accepted,
 708         rxrpc_recvmsg_return,
 709         rxrpc_recvmsg__nr_trace
 710 };
 711
 712 extern const char rxrpc_recvmsg_traces[rxrpc_recvmsg__nr_trace][5];
 713
 714 enum rxrpc_rtt_tx_trace {
 715         rxrpc_rtt_tx_ping,
 716         rxrpc_rtt_tx_data,
 717         rxrpc_rtt_tx__nr_trace
 718 };
 719
 720 extern const char rxrpc_rtt_tx_traces[rxrpc_rtt_tx__nr_trace][5];
 721
 722 enum rxrpc_rtt_rx_trace {
 723         rxrpc_rtt_rx_ping_response,
 724         rxrpc_rtt_rx_requested_ack,
 725         rxrpc_rtt_rx__nr_trace
 726 };
 727
 728 extern const char rxrpc_rtt_rx_traces[rxrpc_rtt_rx__nr_trace][5];
 729
 730 enum rxrpc_timer_trace {
 731         rxrpc_timer_begin,
 732         rxrpc_timer_init_for_reply,
 733         rxrpc_timer_expired,
 734         rxrpc_timer_set_for_ack,
 735         rxrpc_timer_set_for_resend,
 736         rxrpc_timer_set_for_send,
 737         rxrpc_timer__nr_trace
 738 };
 739
 740 extern const char rxrpc_timer_traces[rxrpc_timer__nr_trace][8];
 741
 742 enum rxrpc_propose_ack_trace {
 743         rxrpc_propose_ack_client_tx_end,
 744         rxrpc_propose_ack_input_data,
 745         rxrpc_propose_ack_ping_for_lost_ack,
 746         rxrpc_propose_ack_ping_for_lost_reply,
 747         rxrpc_propose_ack_ping_for_params,
 748         rxrpc_propose_ack_respond_to_ack,
 749         rxrpc_propose_ack_respond_to_ping,
 750         rxrpc_propose_ack_retry_tx,
 751         rxrpc_propose_ack_rotate_rx,
 752         rxrpc_propose_ack_terminal_ack,
 753         rxrpc_propose_ack__nr_trace
 754 };
 755
 756 enum rxrpc_propose_ack_outcome {
 757         rxrpc_propose_ack_use,
 758         rxrpc_propose_ack_update,
 759         rxrpc_propose_ack_subsume,
 760         rxrpc_propose_ack__nr_outcomes
 761 };
 762
 763 extern const char rxrpc_propose_ack_traces[rxrpc_propose_ack__nr_trace][8];
 764 extern const char *const rxrpc_propose_ack_outcomes[rxrpc_propose_ack__nr_outcomes];
 765
 766 enum rxrpc_congest_change {
 767         rxrpc_cong_begin_retransmission,
 768         rxrpc_cong_cleared_nacks,
 769         rxrpc_cong_new_low_nack,
 770         rxrpc_cong_no_change,
 771         rxrpc_cong_progress,
 772         rxrpc_cong_retransmit_again,
 773         rxrpc_cong_rtt_window_end,
 774         rxrpc_cong_saw_nack,
 775         rxrpc_congest__nr_change
 776 };
 777
 778 extern const char rxrpc_congest_modes[NR__RXRPC_CONGEST_MODES][10];
 779 extern const char rxrpc_congest_changes[rxrpc_congest__nr_change][9];
 780
 781 extern const char *const rxrpc_pkts[];
 782 extern const char const rxrpc_ack_names[RXRPC_ACK__INVALID + 1][4];
 783
 784 #include <trace/events/rxrpc.h>
 785
 786 /*
 787  * af_rxrpc.c
 788  */
 789 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
 790 extern u32 rxrpc_epoch;
 791 extern atomic_t rxrpc_debug_id;
 792 extern struct workqueue_struct *rxrpc_workqueue;
 793
 794 /*
 795  * call_accept.c
 796  */
 797 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
 798 void rxrpc_discard_prealloc(struct rxrpc_sock *);
 799 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
 800                                            struct rxrpc_connection *,
 801                                            struct sk_buff *);
 802 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
 803 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
 804                                      rxrpc_notify_rx_t);
 805 int rxrpc_reject_call(struct rxrpc_sock *);
 806
 807 /*
 808  * call_event.c
 809  */
 810 void rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace);
 811 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
 812                        enum rxrpc_propose_ack_trace);
 813 void rxrpc_process_call(struct work_struct *);
 814
 815 /*
 816  * call_object.c
 817  */
 818 extern const char *const rxrpc_call_states[];
 819 extern const char *const rxrpc_call_completions[];
 820 extern unsigned int rxrpc_max_call_lifetime;
 821 extern struct kmem_cache *rxrpc_call_jar;
 822 extern struct list_head rxrpc_calls;
 823 extern rwlock_t rxrpc_call_lock;
 824
 825 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
 826 struct rxrpc_call *rxrpc_alloc_call(gfp_t);
 827 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
 828                                          struct rxrpc_conn_parameters *,
 829                                          struct sockaddr_rxrpc *,
 830                                          unsigned long, gfp_t);
 831 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
 832                          struct sk_buff *);
 833 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
 834 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 835 bool __rxrpc_queue_call(struct rxrpc_call *);
 836 bool rxrpc_queue_call(struct rxrpc_call *);
 837 void rxrpc_see_call(struct rxrpc_call *);
 838 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
 839 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
 840 void rxrpc_cleanup_call(struct rxrpc_call *);
 841 void __exit rxrpc_destroy_all_calls(void);
 842
 843 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
 844 {
 845         return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
 846 }
 847
 848 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
 849 {
 850         return !rxrpc_is_service_call(call);
 851 }
 852
 853 /*
 854  * Transition a call to the complete state.
 855  */
 856 static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
 857                                                enum rxrpc_call_completion compl,
 858                                                u32 abort_code,
 859                                                int error)
 860 {
 861         if (call->state < RXRPC_CALL_COMPLETE) {
 862                 call->abort_code = abort_code;
 863                 call->error = error;
 864                 call->completion = compl,
 865                 call->state = RXRPC_CALL_COMPLETE;
 866                 wake_up(&call->waitq);
 867                 return true;
 868         }
 869         return false;
 870 }
 871
 872 static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
 873                                              enum rxrpc_call_completion compl,
 874                                              u32 abort_code,
 875                                              int error)
 876 {
 877         bool ret;
 878
 879         write_lock_bh(&call->state_lock);
 880         ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
 881         write_unlock_bh(&call->state_lock);
 882         return ret;
 883 }
 884
 885 /*
 886  * Record that a call successfully completed.
 887  */
 888 static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
 889 {
 890         return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
 891 }
 892
 893 static inline bool rxrpc_call_completed(struct rxrpc_call *call)
 894 {
 895         bool ret;
 896
 897         write_lock_bh(&call->state_lock);
 898         ret = __rxrpc_call_completed(call);
 899         write_unlock_bh(&call->state_lock);
 900         return ret;
 901 }
 902
 903 /*
 904  * Record that a call is locally aborted.
 905  */
 906 static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 907                                       rxrpc_seq_t seq,
 908                                       u32 abort_code, int error)
 909 {
 910         trace_rxrpc_abort(why, call->cid, call->call_id, seq,
 911                           abort_code, error);
 912         return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
 913                                            abort_code, error);
 914 }
 915
 916 static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 917                                     rxrpc_seq_t seq, u32 abort_code, int error)
 918 {
 919         bool ret;
 920
 921         write_lock_bh(&call->state_lock);
 922         ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
 923         write_unlock_bh(&call->state_lock);
 924         return ret;
 925 }
 926
 927 /*
 928  * conn_client.c
 929  */
 930 extern unsigned int rxrpc_max_client_connections;
 931 extern unsigned int rxrpc_reap_client_connections;
 932 extern unsigned int rxrpc_conn_idle_client_expiry;
 933 extern unsigned int rxrpc_conn_idle_client_fast_expiry;
 934 extern struct idr rxrpc_client_conn_ids;
 935
 936 void rxrpc_destroy_client_conn_ids(void);
 937 int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *,
 938                        struct sockaddr_rxrpc *, gfp_t);
 939 void rxrpc_expose_client_call(struct rxrpc_call *);
 940 void rxrpc_disconnect_client_call(struct rxrpc_call *);
 941 void rxrpc_put_client_conn(struct rxrpc_connection *);
 942 void __exit rxrpc_destroy_all_client_connections(void);
 943
 944 /*
 945  * conn_event.c
 946  */
 947 void rxrpc_process_connection(struct work_struct *);
 948
 949 /*
 950  * conn_object.c
 951  */
 952 extern unsigned int rxrpc_connection_expiry;
 953 extern struct list_head rxrpc_connections;
 954 extern struct list_head rxrpc_connection_proc_list;
 955 extern rwlock_t rxrpc_connection_lock;
 956
 957 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
 958 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
 959 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
 960                                                    struct sk_buff *);
 961 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
 962 void rxrpc_disconnect_call(struct rxrpc_call *);
 963 void rxrpc_kill_connection(struct rxrpc_connection *);
 964 bool rxrpc_queue_conn(struct rxrpc_connection *);
 965 void rxrpc_see_connection(struct rxrpc_connection *);
 966 void rxrpc_get_connection(struct rxrpc_connection *);
 967 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
 968 void rxrpc_put_service_conn(struct rxrpc_connection *);
 969 void __exit rxrpc_destroy_all_connections(void);
 970
 971 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
 972 {
 973         return conn->out_clientflag;
 974 }
 975
 976 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
 977 {
 978         return !rxrpc_conn_is_client(conn);
 979 }
 980
 981 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
 982 {
 983         if (!conn)
 984                 return;
 985
 986         if (rxrpc_conn_is_client(conn))
 987                 rxrpc_put_client_conn(conn);
 988         else
 989                 rxrpc_put_service_conn(conn);
 990 }
 991
 992 /*
 993  * conn_service.c
 994  */
 995 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
 996                                                      struct sk_buff *);
 997 struct rxrpc_connection *rxrpc_prealloc_service_connection(gfp_t);
 998 void rxrpc_new_incoming_connection(struct rxrpc_connection *, struct sk_buff *);
 999 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
1000
1001 /*
1002  * input.c
1003  */
1004 void rxrpc_data_ready(struct sock *);
1005
1006 /*
1007  * insecure.c
1008  */
1009 extern const struct rxrpc_security rxrpc_no_security;
1010
1011 /*
1012  * key.c
1013  */
1014 extern struct key_type key_type_rxrpc;
1015 extern struct key_type key_type_rxrpc_s;
1016
1017 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
1018 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
1019 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time_t,
1020                               u32);
1021
1022 /*
1023  * local_event.c
1024  */
1025 extern void rxrpc_process_local_events(struct rxrpc_local *);
1026
1027 /*
1028  * local_object.c
1029  */
1030 struct rxrpc_local *rxrpc_lookup_local(const struct sockaddr_rxrpc *);
1031 void __rxrpc_put_local(struct rxrpc_local *);
1032 void __exit rxrpc_destroy_all_locals(void);
1033
1034 static inline void rxrpc_get_local(struct rxrpc_local *local)
1035 {
1036         atomic_inc(&local->usage);
1037 }
1038
1039 static inline
1040 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local)
1041 {
1042         return atomic_inc_not_zero(&local->usage) ? local : NULL;
1043 }
1044
1045 static inline void rxrpc_put_local(struct rxrpc_local *local)
1046 {
1047         if (local && atomic_dec_and_test(&local->usage))
1048                 __rxrpc_put_local(local);
1049 }
1050
1051 static inline void rxrpc_queue_local(struct rxrpc_local *local)
1052 {
1053         rxrpc_queue_work(&local->processor);
1054 }
1055
1056 /*
1057  * misc.c
1058  */
1059 extern unsigned int rxrpc_max_backlog __read_mostly;
1060 extern unsigned int rxrpc_requested_ack_delay;
1061 extern unsigned int rxrpc_soft_ack_delay;
1062 extern unsigned int rxrpc_idle_ack_delay;
1063 extern unsigned int rxrpc_rx_window_size;
1064 extern unsigned int rxrpc_rx_mtu;
1065 extern unsigned int rxrpc_rx_jumbo_max;
1066 extern unsigned int rxrpc_resend_timeout;
1067
1068 extern const s8 rxrpc_ack_priority[];
1069
1070 /*
1071  * output.c
1072  */
1073 int rxrpc_send_call_packet(struct rxrpc_call *, u8);
1074 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
1075 void rxrpc_reject_packets(struct rxrpc_local *);
1076
1077 /*
1078  * peer_event.c
1079  */
1080 void rxrpc_error_report(struct sock *);
1081 void rxrpc_peer_error_distributor(struct work_struct *);
1082 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
1083                         rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1084
1085 /*
1086  * peer_object.c
1087  */
1088 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1089                                          const struct sockaddr_rxrpc *);
1090 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *,
1091                                      struct sockaddr_rxrpc *, gfp_t);
1092 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
1093 struct rxrpc_peer *rxrpc_lookup_incoming_peer(struct rxrpc_local *,
1094                                               struct rxrpc_peer *);
1095
1096 static inline struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer)
1097 {
1098         atomic_inc(&peer->usage);
1099         return peer;
1100 }
1101
1102 static inline
1103 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer)
1104 {
1105         return atomic_inc_not_zero(&peer->usage) ? peer : NULL;
1106 }
1107
1108 extern void __rxrpc_put_peer(struct rxrpc_peer *peer);
1109 static inline void rxrpc_put_peer(struct rxrpc_peer *peer)
1110 {
1111         if (peer && atomic_dec_and_test(&peer->usage))
1112                 __rxrpc_put_peer(peer);
1113 }
1114
1115 /*
1116  * proc.c
1117  */
1118 extern const struct file_operations rxrpc_call_seq_fops;
1119 extern const struct file_operations rxrpc_connection_seq_fops;
1120
1121 /*
1122  * recvmsg.c
1123  */
1124 void rxrpc_notify_socket(struct rxrpc_call *);
1125 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1126
1127 /*
1128  * rxkad.c
1129  */
1130 #ifdef CONFIG_RXKAD
1131 extern const struct rxrpc_security rxkad;
1132 #endif
1133
1134 /*
1135  * security.c
1136  */
1137 int __init rxrpc_init_security(void);
1138 void rxrpc_exit_security(void);
1139 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1140 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
1141
1142 /*
1143  * sendmsg.c
1144  */
1145 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1146
1147 /*
1148  * skbuff.c
1149  */
1150 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1151 void rxrpc_packet_destructor(struct sk_buff *);
1152 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1153 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1154 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1155 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1156 void rxrpc_lose_skb(struct sk_buff *, enum rxrpc_skb_trace);
1157 void rxrpc_purge_queue(struct sk_buff_head *);
1158
1159 /*
1160  * sysctl.c
1161  */
1162 #ifdef CONFIG_SYSCTL
1163 extern int __init rxrpc_sysctl_init(void);
1164 extern void rxrpc_sysctl_exit(void);
1165 #else
1166 static inline int __init rxrpc_sysctl_init(void) { return 0; }
1167 static inline void rxrpc_sysctl_exit(void) {}
1168 #endif
1169
1170 /*
1171  * utils.c
1172  */
1173 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1174
1175 static inline bool before(u32 seq1, u32 seq2)
1176 {
1177         return (s32)(seq1 - seq2) < 0;
1178 }
1179 static inline bool before_eq(u32 seq1, u32 seq2)
1180 {
1181         return (s32)(seq1 - seq2) <= 0;
1182 }
1183 static inline bool after(u32 seq1, u32 seq2)
1184 {
1185         return (s32)(seq1 - seq2) > 0;
1186 }
1187 static inline bool after_eq(u32 seq1, u32 seq2)
1188 {
1189         return (s32)(seq1 - seq2) >= 0;
1190 }
1191
1192 /*
1193  * debug tracing
1194  */
1195 extern unsigned int rxrpc_debug;
1196
1197 #define dbgprintk(FMT,...) \
1198         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1199
1200 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1201 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1202 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
1203 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
1204 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1205
1206
1207 #if defined(__KDEBUG)
1208 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1209 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1210 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1211 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
1212 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
1213
1214 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1215 #define RXRPC_DEBUG_KENTER      0x01
1216 #define RXRPC_DEBUG_KLEAVE      0x02
1217 #define RXRPC_DEBUG_KDEBUG      0x04
1218 #define RXRPC_DEBUG_KPROTO      0x08
1219 #define RXRPC_DEBUG_KNET        0x10
1220
1221 #define _enter(FMT,...)                                 \
1222 do {                                                    \
1223         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1224                 kenter(FMT,##__VA_ARGS__);              \
1225 } while (0)
1226
1227 #define _leave(FMT,...)                                 \
1228 do {                                                    \
1229         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1230                 kleave(FMT,##__VA_ARGS__);              \
1231 } while (0)
1232
1233 #define _debug(FMT,...)                                 \
1234 do {                                                    \
1235         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1236                 kdebug(FMT,##__VA_ARGS__);              \
1237 } while (0)
1238
1239 #define _proto(FMT,...)                                 \
1240 do {                                                    \
1241         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
1242                 kproto(FMT,##__VA_ARGS__);              \
1243 } while (0)
1244
1245 #define _net(FMT,...)                                   \
1246 do {                                                    \
1247         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
1248                 knet(FMT,##__VA_ARGS__);                \
1249 } while (0)
1250
1251 #else
1252 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1253 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1254 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
1255 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
1256 #define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
1257 #endif
1258
1259 /*
1260  * debug assertion checking
1261  */
1262 #if 1 // defined(__KDEBUGALL)
1263
1264 #define ASSERT(X)                                               \
1265 do {                                                            \
1266         if (unlikely(!(X))) {                                   \
1267                 pr_err("Assertion failed\n");                   \
1268                 BUG();                                          \
1269         }                                                       \
1270 } while (0)
1271
1272 #define ASSERTCMP(X, OP, Y)                                             \
1273 do {                                                                    \
1274         __typeof__(X) _x = (X);                                         \
1275         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1276         if (unlikely(!(_x OP _y))) {                                    \
1277                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1278                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1279                        (unsigned long)_y, (unsigned long)_y);           \
1280                 BUG();                                                  \
1281         }                                                               \
1282 } while (0)
1283
1284 #define ASSERTIF(C, X)                                          \
1285 do {                                                            \
1286         if (unlikely((C) && !(X))) {                            \
1287                 pr_err("Assertion failed\n");                   \
1288                 BUG();                                          \
1289         }                                                       \
1290 } while (0)
1291
1292 #define ASSERTIFCMP(C, X, OP, Y)                                        \
1293 do {                                                                    \
1294         __typeof__(X) _x = (X);                                         \
1295         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1296         if (unlikely((C) && !(_x OP _y))) {                             \
1297                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1298                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1299                        (unsigned long)_y, (unsigned long)_y);           \
1300                 BUG();                                                  \
1301         }                                                               \
1302 } while (0)
1303
1304 #else
1305
1306 #define ASSERT(X)                               \
1307 do {                                            \
1308 } while (0)
1309
1310 #define ASSERTCMP(X, OP, Y)                     \
1311 do {                                            \
1312 } while (0)
1313
1314 #define ASSERTIF(C, X)                          \
1315 do {                                            \
1316 } while (0)
1317
1318 #define ASSERTIFCMP(C, X, OP, Y)                \
1319 do {                                            \
1320 } while (0)
1321
1322 #endif /* __KDEBUGALL */