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