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