net/rxrpc/ar-internal.h

   1 /* AF_RXRPC internal definitions
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/atomic.h>
  13 #include <linux/seqlock.h>
  14 #include <net/net_namespace.h>
  15 #include <net/netns/generic.h>
  16 #include <net/sock.h>
  17 #include <net/af_rxrpc.h>
  18 #include "protocol.h"
  19
  20 #if 0
  21 #define CHECK_SLAB_OKAY(X)                                   \
  22         BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
  23                (POISON_FREE << 8 | POISON_FREE))
  24 #else
  25 #define CHECK_SLAB_OKAY(X) do {} while (0)
  26 #endif
  27
  28 #define FCRYPT_BSIZE 8
  29 struct rxrpc_crypt {
  30         union {
  31                 u8      x[FCRYPT_BSIZE];
  32                 __be32  n[2];
  33         };
  34 } __attribute__((aligned(8)));
  35
  36 #define rxrpc_queue_work(WS)    queue_work(rxrpc_workqueue, (WS))
  37 #define rxrpc_queue_delayed_work(WS,D)  \
  38         queue_delayed_work(rxrpc_workqueue, (WS), (D))
  39
  40 struct rxrpc_connection;
  41
  42 /*
  43  * Mark applied to socket buffers.
  44  */
  45 enum rxrpc_skb_mark {
  46         RXRPC_SKB_MARK_DATA,            /* data message */
  47         RXRPC_SKB_MARK_FINAL_ACK,       /* final ACK received message */
  48         RXRPC_SKB_MARK_BUSY,            /* server busy message */
  49         RXRPC_SKB_MARK_REMOTE_ABORT,    /* remote abort message */
  50         RXRPC_SKB_MARK_LOCAL_ABORT,     /* local abort message */
  51         RXRPC_SKB_MARK_NET_ERROR,       /* network error message */
  52         RXRPC_SKB_MARK_LOCAL_ERROR,     /* local error message */
  53         RXRPC_SKB_MARK_NEW_CALL,        /* local error message */
  54 };
  55
  56 /*
  57  * sk_state for RxRPC sockets
  58  */
  59 enum {
  60         RXRPC_UNBOUND = 0,
  61         RXRPC_CLIENT_UNBOUND,           /* Unbound socket used as client */
  62         RXRPC_CLIENT_BOUND,             /* client local address bound */
  63         RXRPC_SERVER_BOUND,             /* server local address bound */
  64         RXRPC_SERVER_BOUND2,            /* second server local address bound */
  65         RXRPC_SERVER_LISTENING,         /* server listening for connections */
  66         RXRPC_SERVER_LISTEN_DISABLED,   /* server listening disabled */
  67         RXRPC_CLOSE,                    /* socket is being closed */
  68 };
  69
  70 /*
  71  * Per-network namespace data.
  72  */
  73 struct rxrpc_net {
  74         struct proc_dir_entry   *proc_net;      /* Subdir in /proc/net */
  75         u32                     epoch;          /* Local epoch for detecting local-end reset */
  76         struct list_head        calls;          /* List of calls active in this namespace */
  77         rwlock_t                call_lock;      /* Lock for ->calls */
  78
  79         struct list_head        conn_proc_list; /* List of conns in this namespace for proc */
  80         struct list_head        service_conns;  /* Service conns in this namespace */
  81         rwlock_t                conn_lock;      /* Lock for ->conn_proc_list, ->service_conns */
  82         struct delayed_work     service_conn_reaper;
  83
  84         unsigned int            nr_client_conns;
  85         unsigned int            nr_active_client_conns;
  86         bool                    kill_all_client_conns;
  87         spinlock_t              client_conn_cache_lock; /* Lock for ->*_client_conns */
  88         spinlock_t              client_conn_discard_lock; /* Prevent multiple discarders */
  89         struct list_head        waiting_client_conns;
  90         struct list_head        active_client_conns;
  91         struct list_head        idle_client_conns;
  92         struct delayed_work     client_conn_reaper;
  93
  94         struct list_head        local_endpoints;
  95         struct mutex            local_mutex;    /* Lock for ->local_endpoints */
  96
  97         spinlock_t              peer_hash_lock; /* Lock for ->peer_hash */
  98         DECLARE_HASHTABLE       (peer_hash, 10);
  99 };
 100
 101 /*
 102  * Service backlog preallocation.
 103  *
 104  * This contains circular buffers of preallocated peers, connections and calls
 105  * for incoming service calls and their head and tail pointers.  This allows
 106  * calls to be set up in the data_ready handler, thereby avoiding the need to
 107  * shuffle packets around so much.
 108  */
 109 struct rxrpc_backlog {
 110         unsigned short          peer_backlog_head;
 111         unsigned short          peer_backlog_tail;
 112         unsigned short          conn_backlog_head;
 113         unsigned short          conn_backlog_tail;
 114         unsigned short          call_backlog_head;
 115         unsigned short          call_backlog_tail;
 116 #define RXRPC_BACKLOG_MAX       32
 117         struct rxrpc_peer       *peer_backlog[RXRPC_BACKLOG_MAX];
 118         struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
 119         struct rxrpc_call       *call_backlog[RXRPC_BACKLOG_MAX];
 120 };
 121
 122 /*
 123  * RxRPC socket definition
 124  */
 125 struct rxrpc_sock {
 126         /* WARNING: sk has to be the first member */
 127         struct sock             sk;
 128         rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
 129         rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
 130         struct rxrpc_local      *local;         /* local endpoint */
 131         struct rxrpc_backlog    *backlog;       /* Preallocation for services */
 132         spinlock_t              incoming_lock;  /* Incoming call vs service shutdown lock */
 133         struct list_head        sock_calls;     /* List of calls owned by this socket */
 134         struct list_head        to_be_accepted; /* calls awaiting acceptance */
 135         struct list_head        recvmsg_q;      /* Calls awaiting recvmsg's attention  */
 136         rwlock_t                recvmsg_lock;   /* Lock for recvmsg_q */
 137         struct key              *key;           /* security for this socket */
 138         struct key              *securities;    /* list of server security descriptors */
 139         struct rb_root          calls;          /* User ID -> call mapping */
 140         unsigned long           flags;
 141 #define RXRPC_SOCK_CONNECTED            0       /* connect_srx is set */
 142         rwlock_t                call_lock;      /* lock for calls */
 143         u32                     min_sec_level;  /* minimum security level */
 144 #define RXRPC_SECURITY_MAX      RXRPC_SECURITY_ENCRYPT
 145         bool                    exclusive;      /* Exclusive connection for a client socket */
 146         u16                     second_service; /* Additional service bound to the endpoint */
 147         struct {
 148                 /* Service upgrade information */
 149                 u16             from;           /* Service ID to upgrade (if not 0) */
 150                 u16             to;             /* service ID to upgrade to */
 151         } service_upgrade;
 152         sa_family_t             family;         /* Protocol family created with */
 153         struct sockaddr_rxrpc   srx;            /* Primary Service/local addresses */
 154         struct sockaddr_rxrpc   connect_srx;    /* Default client address from connect() */
 155 };
 156
 157 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
 158
 159 /*
 160  * CPU-byteorder normalised Rx packet header.
 161  */
 162 struct rxrpc_host_header {
 163         u32             epoch;          /* client boot timestamp */
 164         u32             cid;            /* connection and channel ID */
 165         u32             callNumber;     /* call ID (0 for connection-level packets) */
 166         u32             seq;            /* sequence number of pkt in call stream */
 167         u32             serial;         /* serial number of pkt sent to network */
 168         u8              type;           /* packet type */
 169         u8              flags;          /* packet flags */
 170         u8              userStatus;     /* app-layer defined status */
 171         u8              securityIndex;  /* security protocol ID */
 172         union {
 173                 u16     _rsvd;          /* reserved */
 174                 u16     cksum;          /* kerberos security checksum */
 175         };
 176         u16             serviceId;      /* service ID */
 177 } __packed;
 178
 179 /*
 180  * RxRPC socket buffer private variables
 181  * - max 48 bytes (struct sk_buff::cb)
 182  */
 183 struct rxrpc_skb_priv {
 184         union {
 185                 u8              nr_jumbo;       /* Number of jumbo subpackets */
 186         };
 187         union {
 188                 int             remain;         /* amount of space remaining for next write */
 189         };
 190
 191         struct rxrpc_host_header hdr;           /* RxRPC packet header from this packet */
 192 };
 193
 194 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
 195
 196 /*
 197  * RxRPC security module interface
 198  */
 199 struct rxrpc_security {
 200         const char              *name;          /* name of this service */
 201         u8                      security_index; /* security type provided */
 202
 203         /* Initialise a security service */
 204         int (*init)(void);
 205
 206         /* Clean up a security service */
 207         void (*exit)(void);
 208
 209         /* initialise a connection's security */
 210         int (*init_connection_security)(struct rxrpc_connection *);
 211
 212         /* prime a connection's packet security */
 213         int (*prime_packet_security)(struct rxrpc_connection *);
 214
 215         /* impose security on a packet */
 216         int (*secure_packet)(struct rxrpc_call *,
 217                              struct sk_buff *,
 218                              size_t,
 219                              void *);
 220
 221         /* verify the security on a received packet */
 222         int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
 223                              unsigned int, unsigned int, rxrpc_seq_t, u16);
 224
 225         /* Locate the data in a received packet that has been verified. */
 226         void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
 227                             unsigned int *, unsigned int *);
 228
 229         /* issue a challenge */
 230         int (*issue_challenge)(struct rxrpc_connection *);
 231
 232         /* respond to a challenge */
 233         int (*respond_to_challenge)(struct rxrpc_connection *,
 234                                     struct sk_buff *,
 235                                     u32 *);
 236
 237         /* verify a response */
 238         int (*verify_response)(struct rxrpc_connection *,
 239                                struct sk_buff *,
 240                                u32 *);
 241
 242         /* clear connection security */
 243         void (*clear)(struct rxrpc_connection *);
 244 };
 245
 246 /*
 247  * RxRPC local transport endpoint description
 248  * - owned by a single AF_RXRPC socket
 249  * - pointed to by transport socket struct sk_user_data
 250  */
 251 struct rxrpc_local {
 252         struct rcu_head         rcu;
 253         atomic_t                usage;
 254         struct rxrpc_net        *rxnet;         /* The network ns in which this resides */
 255         struct list_head        link;
 256         struct socket           *socket;        /* my UDP socket */
 257         struct work_struct      processor;
 258         struct rxrpc_sock __rcu *service;       /* Service(s) listening on this endpoint */
 259         struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
 260         struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
 261         struct sk_buff_head     event_queue;    /* endpoint event packets awaiting processing */
 262         struct rb_root          client_conns;   /* Client connections by socket params */
 263         spinlock_t              client_conns_lock; /* Lock for client_conns */
 264         spinlock_t              lock;           /* access lock */
 265         rwlock_t                services_lock;  /* lock for services list */
 266         int                     debug_id;       /* debug ID for printks */
 267         bool                    dead;
 268         struct sockaddr_rxrpc   srx;            /* local address */
 269 };
 270
 271 /*
 272  * RxRPC remote transport endpoint definition
 273  * - matched by local endpoint, remote port, address and protocol type
 274  */
 275 struct rxrpc_peer {
 276         struct rcu_head         rcu;            /* This must be first */
 277         atomic_t                usage;
 278         unsigned long           hash_key;
 279         struct hlist_node       hash_link;
 280         struct rxrpc_local      *local;
 281         struct hlist_head       error_targets;  /* targets for net error distribution */
 282         struct work_struct      error_distributor;
 283         struct rb_root          service_conns;  /* Service connections */
 284         seqlock_t               service_conn_lock;
 285         spinlock_t              lock;           /* access lock */
 286         unsigned int            if_mtu;         /* interface MTU for this peer */
 287         unsigned int            mtu;            /* network MTU for this peer */
 288         unsigned int            maxdata;        /* data size (MTU - hdrsize) */
 289         unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
 290         int                     debug_id;       /* debug ID for printks */
 291         int                     error_report;   /* Net (+0) or local (+1000000) to distribute */
 292 #define RXRPC_LOCAL_ERROR_OFFSET 1000000
 293         struct sockaddr_rxrpc   srx;            /* remote address */
 294
 295         /* calculated RTT cache */
 296 #define RXRPC_RTT_CACHE_SIZE 32
 297         ktime_t                 rtt_last_req;   /* Time of last RTT request */
 298         u64                     rtt;            /* Current RTT estimate (in nS) */
 299         u64                     rtt_sum;        /* Sum of cache contents */
 300         u64                     rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */
 301         u8                      rtt_cursor;     /* next entry at which to insert */
 302         u8                      rtt_usage;      /* amount of cache actually used */
 303
 304         u8                      cong_cwnd;      /* Congestion window size */
 305 };
 306
 307 /*
 308  * Keys for matching a connection.
 309  */
 310 struct rxrpc_conn_proto {
 311         union {
 312                 struct {
 313                         u32     epoch;          /* epoch of this connection */
 314                         u32     cid;            /* connection ID */
 315                 };
 316                 u64             index_key;
 317         };
 318 };
 319
 320 struct rxrpc_conn_parameters {
 321         struct rxrpc_local      *local;         /* Representation of local endpoint */
 322         struct rxrpc_peer       *peer;          /* Remote endpoint */
 323         struct key              *key;           /* Security details */
 324         bool                    exclusive;      /* T if conn is exclusive */
 325         bool                    upgrade;        /* T if service ID can be upgraded */
 326         u16                     service_id;     /* Service ID for this connection */
 327         u32                     security_level; /* Security level selected */
 328 };
 329
 330 /*
 331  * Bits in the connection flags.
 332  */
 333 enum rxrpc_conn_flag {
 334         RXRPC_CONN_HAS_IDR,             /* Has a client conn ID assigned */
 335         RXRPC_CONN_IN_SERVICE_CONNS,    /* Conn is in peer->service_conns */
 336         RXRPC_CONN_IN_CLIENT_CONNS,     /* Conn is in local->client_conns */
 337         RXRPC_CONN_EXPOSED,             /* Conn has extra ref for exposure */
 338         RXRPC_CONN_DONT_REUSE,          /* Don't reuse this connection */
 339         RXRPC_CONN_COUNTED,             /* Counted by rxrpc_nr_client_conns */
 340         RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */
 341 };
 342
 343 /*
 344  * Events that can be raised upon a connection.
 345  */
 346 enum rxrpc_conn_event {
 347         RXRPC_CONN_EV_CHALLENGE,        /* Send challenge packet */
 348 };
 349
 350 /*
 351  * The connection cache state.
 352  */
 353 enum rxrpc_conn_cache_state {
 354         RXRPC_CONN_CLIENT_INACTIVE,     /* Conn is not yet listed */
 355         RXRPC_CONN_CLIENT_WAITING,      /* Conn is on wait list, waiting for capacity */
 356         RXRPC_CONN_CLIENT_ACTIVE,       /* Conn is on active list, doing calls */
 357         RXRPC_CONN_CLIENT_UPGRADE,      /* Conn is on active list, probing for upgrade */
 358         RXRPC_CONN_CLIENT_CULLED,       /* Conn is culled and delisted, doing calls */
 359         RXRPC_CONN_CLIENT_IDLE,         /* Conn is on idle list, doing mostly nothing */
 360         RXRPC_CONN__NR_CACHE_STATES
 361 };
 362
 363 /*
 364  * The connection protocol state.
 365  */
 366 enum rxrpc_conn_proto_state {
 367         RXRPC_CONN_UNUSED,              /* Connection not yet attempted */
 368         RXRPC_CONN_CLIENT,              /* Client connection */
 369         RXRPC_CONN_SERVICE_PREALLOC,    /* Service connection preallocation */
 370         RXRPC_CONN_SERVICE_UNSECURED,   /* Service unsecured connection */
 371         RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
 372         RXRPC_CONN_SERVICE,             /* Service secured connection */
 373         RXRPC_CONN_REMOTELY_ABORTED,    /* Conn aborted by peer */
 374         RXRPC_CONN_LOCALLY_ABORTED,     /* Conn aborted locally */
 375         RXRPC_CONN__NR_STATES
 376 };
 377
 378 /*
 379  * RxRPC connection definition
 380  * - matched by { local, peer, epoch, conn_id, direction }
 381  * - each connection can only handle four simultaneous calls
 382  */
 383 struct rxrpc_connection {
 384         struct rxrpc_conn_proto proto;
 385         struct rxrpc_conn_parameters params;
 386
 387         atomic_t                usage;
 388         struct rcu_head         rcu;
 389         struct list_head        cache_link;
 390
 391         spinlock_t              channel_lock;
 392         unsigned char           active_chans;   /* Mask of active channels */
 393 #define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1)
 394         struct list_head        waiting_calls;  /* Calls waiting for channels */
 395         struct rxrpc_channel {
 396                 struct rxrpc_call __rcu *call;          /* Active call */
 397                 u32                     call_id;        /* ID of current call */
 398                 u32                     call_counter;   /* Call ID counter */
 399                 u32                     last_call;      /* ID of last call */
 400                 u8                      last_type;      /* Type of last packet */
 401                 union {
 402                         u32             last_seq;
 403                         u32             last_abort;
 404                 };
 405         } channels[RXRPC_MAXCALLS];
 406
 407         struct work_struct      processor;      /* connection event processor */
 408         union {
 409                 struct rb_node  client_node;    /* Node in local->client_conns */
 410                 struct rb_node  service_node;   /* Node in peer->service_conns */
 411         };
 412         struct list_head        proc_link;      /* link in procfs list */
 413         struct list_head        link;           /* link in master connection list */
 414         struct sk_buff_head     rx_queue;       /* received conn-level packets */
 415         const struct rxrpc_security *security;  /* applied security module */
 416         struct key              *server_key;    /* security for this service */
 417         struct crypto_skcipher  *cipher;        /* encryption handle */
 418         struct rxrpc_crypt      csum_iv;        /* packet checksum base */
 419         unsigned long           flags;
 420         unsigned long           events;
 421         unsigned long           idle_timestamp; /* Time at which last became idle */
 422         spinlock_t              state_lock;     /* state-change lock */
 423         enum rxrpc_conn_cache_state cache_state;
 424         enum rxrpc_conn_proto_state state;      /* current state of connection */
 425         u32                     local_abort;    /* local abort code */
 426         u32                     remote_abort;   /* remote abort code */
 427         int                     debug_id;       /* debug ID for printks */
 428         atomic_t                serial;         /* packet serial number counter */
 429         unsigned int            hi_serial;      /* highest serial number received */
 430         u32                     security_nonce; /* response re-use preventer */
 431         u16                     service_id;     /* Service ID, possibly upgraded */
 432         u8                      size_align;     /* data size alignment (for security) */
 433         u8                      security_size;  /* security header size */
 434         u8                      security_ix;    /* security type */
 435         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
 436 };
 437
 438 /*
 439  * Flags in call->flags.
 440  */
 441 enum rxrpc_call_flag {
 442         RXRPC_CALL_RELEASED,            /* call has been released - no more message to userspace */
 443         RXRPC_CALL_HAS_USERID,          /* has a user ID attached */
 444         RXRPC_CALL_IS_SERVICE,          /* Call is service call */
 445         RXRPC_CALL_EXPOSED,             /* The call was exposed to the world */
 446         RXRPC_CALL_RX_LAST,             /* Received the last packet (at rxtx_top) */
 447         RXRPC_CALL_TX_LAST,             /* Last packet in Tx buffer (at rxtx_top) */
 448         RXRPC_CALL_TX_LASTQ,            /* Last packet has been queued */
 449         RXRPC_CALL_SEND_PING,           /* A ping will need to be sent */
 450         RXRPC_CALL_PINGING,             /* Ping in process */
 451         RXRPC_CALL_RETRANS_TIMEOUT,     /* Retransmission due to timeout occurred */
 452 };
 453
 454 /*
 455  * Events that can be raised on a call.
 456  */
 457 enum rxrpc_call_event {
 458         RXRPC_CALL_EV_ACK,              /* need to generate ACK */
 459         RXRPC_CALL_EV_ABORT,            /* need to generate abort */
 460         RXRPC_CALL_EV_TIMER,            /* Timer expired */
 461         RXRPC_CALL_EV_RESEND,           /* Tx resend required */
 462         RXRPC_CALL_EV_PING,             /* Ping send required */
 463 };
 464
 465 /*
 466  * The states that a call can be in.
 467  */
 468 enum rxrpc_call_state {
 469         RXRPC_CALL_UNINITIALISED,
 470         RXRPC_CALL_CLIENT_AWAIT_CONN,   /* - client waiting for connection to become available */
 471         RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
 472         RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
 473         RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
 474         RXRPC_CALL_SERVER_PREALLOC,     /* - service preallocation */
 475         RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
 476         RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
 477         RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
 478         RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
 479         RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
 480         RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
 481         RXRPC_CALL_COMPLETE,            /* - call complete */
 482         NR__RXRPC_CALL_STATES
 483 };
 484
 485 /*
 486  * Call Tx congestion management modes.
 487  */
 488 enum rxrpc_congest_mode {
 489         RXRPC_CALL_SLOW_START,
 490         RXRPC_CALL_CONGEST_AVOIDANCE,
 491         RXRPC_CALL_PACKET_LOSS,
 492         RXRPC_CALL_FAST_RETRANSMIT,
 493         NR__RXRPC_CONGEST_MODES
 494 };
 495
 496 /*
 497  * RxRPC call definition
 498  * - matched by { connection, call_id }
 499  */
 500 struct rxrpc_call {
 501         struct rcu_head         rcu;
 502         struct rxrpc_connection *conn;          /* connection carrying call */
 503         struct rxrpc_peer       *peer;          /* Peer record for remote address */
 504         struct rxrpc_sock __rcu *socket;        /* socket responsible */
 505         struct mutex            user_mutex;     /* User access mutex */
 506         ktime_t                 ack_at;         /* When deferred ACK needs to happen */
 507         ktime_t                 resend_at;      /* When next resend needs to happen */
 508         ktime_t                 ping_at;        /* When next to send a ping */
 509         ktime_t                 expire_at;      /* When the call times out */
 510         struct timer_list       timer;          /* Combined event timer */
 511         struct work_struct      processor;      /* Event processor */
 512         rxrpc_notify_rx_t       notify_rx;      /* kernel service Rx notification function */
 513         struct list_head        link;           /* link in master call list */
 514         struct list_head        chan_wait_link; /* Link in conn->waiting_calls */
 515         struct hlist_node       error_link;     /* link in error distribution list */
 516         struct list_head        accept_link;    /* Link in rx->acceptq */
 517         struct list_head        recvmsg_link;   /* Link in rx->recvmsg_q */
 518         struct list_head        sock_link;      /* Link in rx->sock_calls */
 519         struct rb_node          sock_node;      /* Node in rx->calls */
 520         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
 521         wait_queue_head_t       waitq;          /* Wait queue for channel or Tx */
 522         s64                     tx_total_len;   /* Total length left to be transmitted (or -1) */
 523         __be32                  crypto_buf[2];  /* Temporary packet crypto buffer */
 524         unsigned long           user_call_ID;   /* user-defined call ID */
 525         unsigned long           flags;
 526         unsigned long           events;
 527         spinlock_t              lock;
 528         rwlock_t                state_lock;     /* lock for state transition */
 529         u32                     abort_code;     /* Local/remote abort code */
 530         int                     error;          /* Local error incurred */
 531         enum rxrpc_call_state   state;          /* current state of call */
 532         enum rxrpc_call_completion completion;  /* Call completion condition */
 533         atomic_t                usage;
 534         u16                     service_id;     /* service ID */
 535         u8                      security_ix;    /* Security type */
 536         u32                     call_id;        /* call ID on connection  */
 537         u32                     cid;            /* connection ID plus channel index */
 538         int                     debug_id;       /* debug ID for printks */
 539         unsigned short          rx_pkt_offset;  /* Current recvmsg packet offset */
 540         unsigned short          rx_pkt_len;     /* Current recvmsg packet len */
 541
 542         /* Rx/Tx circular buffer, depending on phase.
 543          *
 544          * In the Rx phase, packets are annotated with 0 or the number of the
 545          * segment of a jumbo packet each buffer refers to.  There can be up to
 546          * 47 segments in a maximum-size UDP packet.
 547          *
 548          * In the Tx phase, packets are annotated with which buffers have been
 549          * acked.
 550          */
 551 #define RXRPC_RXTX_BUFF_SIZE    64
 552 #define RXRPC_RXTX_BUFF_MASK    (RXRPC_RXTX_BUFF_SIZE - 1)
 553 #define RXRPC_INIT_RX_WINDOW_SIZE 32
 554         struct sk_buff          **rxtx_buffer;
 555         u8                      *rxtx_annotations;
 556 #define RXRPC_TX_ANNO_ACK       0
 557 #define RXRPC_TX_ANNO_UNACK     1
 558 #define RXRPC_TX_ANNO_NAK       2
 559 #define RXRPC_TX_ANNO_RETRANS   3
 560 #define RXRPC_TX_ANNO_MASK      0x03
 561 #define RXRPC_TX_ANNO_LAST      0x04
 562 #define RXRPC_TX_ANNO_RESENT    0x08
 563
 564 #define RXRPC_RX_ANNO_JUMBO     0x3f            /* Jumbo subpacket number + 1 if not zero */
 565 #define RXRPC_RX_ANNO_JLAST     0x40            /* Set if last element of a jumbo packet */
 566 #define RXRPC_RX_ANNO_VERIFIED  0x80            /* Set if verified and decrypted */
 567         rxrpc_seq_t             tx_hard_ack;    /* Dead slot in buffer; the first transmitted but
 568                                                  * not hard-ACK'd packet follows this.
 569                                                  */
 570         rxrpc_seq_t             tx_top;         /* Highest Tx slot allocated. */
 571
 572         /* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
 573          * is fixed, we keep these numbers in terms of segments (ie. DATA
 574          * packets) rather than bytes.
 575          */
 576 #define RXRPC_TX_SMSS           RXRPC_JUMBO_DATALEN
 577         u8                      cong_cwnd;      /* Congestion window size */
 578         u8                      cong_extra;     /* Extra to send for congestion management */
 579         u8                      cong_ssthresh;  /* Slow-start threshold */
 580         enum rxrpc_congest_mode cong_mode:8;    /* Congestion management mode */
 581         u8                      cong_dup_acks;  /* Count of ACKs showing missing packets */
 582         u8                      cong_cumul_acks; /* Cumulative ACK count */
 583         ktime_t                 cong_tstamp;    /* Last time cwnd was changed */
 584
 585         rxrpc_seq_t             rx_hard_ack;    /* Dead slot in buffer; the first received but not
 586                                                  * consumed packet follows this.
 587                                                  */
 588         rxrpc_seq_t             rx_top;         /* Highest Rx slot allocated. */
 589         rxrpc_seq_t             rx_expect_next; /* Expected next packet sequence number */
 590         u8                      rx_winsize;     /* Size of Rx window */
 591         u8                      tx_winsize;     /* Maximum size of Tx window */
 592         bool                    tx_phase;       /* T if transmission phase, F if receive phase */
 593         u8                      nr_jumbo_bad;   /* Number of jumbo dups/exceeds-windows */
 594
 595         /* receive-phase ACK management */
 596         u8                      ackr_reason;    /* reason to ACK */
 597         u16                     ackr_skew;      /* skew on packet being ACK'd */
 598         rxrpc_serial_t          ackr_serial;    /* serial of packet being ACK'd */
 599         rxrpc_seq_t             ackr_prev_seq;  /* previous sequence number received */
 600         rxrpc_seq_t             ackr_consumed;  /* Highest packet shown consumed */
 601         rxrpc_seq_t             ackr_seen;      /* Highest packet shown seen */
 602
 603         /* ping management */
 604         rxrpc_serial_t          ping_serial;    /* Last ping sent */
 605         ktime_t                 ping_time;      /* Time last ping sent */
 606
 607         /* transmission-phase ACK management */
 608         ktime_t                 acks_latest_ts; /* Timestamp of latest ACK received */
 609         rxrpc_serial_t          acks_latest;    /* serial number of latest ACK received */
 610         rxrpc_seq_t             acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
 611 };
 612
 613 /*
 614  * Summary of a new ACK and the changes it made to the Tx buffer packet states.
 615  */
 616 struct rxrpc_ack_summary {
 617         u8                      ack_reason;
 618         u8                      nr_acks;                /* Number of ACKs in packet */
 619         u8                      nr_nacks;               /* Number of NACKs in packet */
 620         u8                      nr_new_acks;            /* Number of new ACKs in packet */
 621         u8                      nr_new_nacks;           /* Number of new NACKs in packet */
 622         u8                      nr_rot_new_acks;        /* Number of rotated new ACKs */
 623         bool                    new_low_nack;           /* T if new low NACK found */
 624         bool                    retrans_timeo;          /* T if reTx due to timeout happened */
 625         u8                      flight_size;            /* Number of unreceived transmissions */
 626         /* Place to stash values for tracing */
 627         enum rxrpc_congest_mode mode:8;
 628         u8                      cwnd;
 629         u8                      ssthresh;
 630         u8                      dup_acks;
 631         u8                      cumulative_acks;
 632 };
 633
 634 #include <trace/events/rxrpc.h>
 635
 636 /*
 637  * af_rxrpc.c
 638  */
 639 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
 640 extern atomic_t rxrpc_debug_id;
 641 extern struct workqueue_struct *rxrpc_workqueue;
 642
 643 /*
 644  * call_accept.c
 645  */
 646 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
 647 void rxrpc_discard_prealloc(struct rxrpc_sock *);
 648 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
 649                                            struct rxrpc_connection *,
 650                                            struct sk_buff *);
 651 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
 652 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
 653                                      rxrpc_notify_rx_t);
 654 int rxrpc_reject_call(struct rxrpc_sock *);
 655
 656 /*
 657  * call_event.c
 658  */
 659 void __rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t);
 660 void rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t);
 661 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
 662                        enum rxrpc_propose_ack_trace);
 663 void rxrpc_process_call(struct work_struct *);
 664
 665 /*
 666  * call_object.c
 667  */
 668 extern const char *const rxrpc_call_states[];
 669 extern const char *const rxrpc_call_completions[];
 670 extern unsigned int rxrpc_max_call_lifetime;
 671 extern struct kmem_cache *rxrpc_call_jar;
 672
 673 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
 674 struct rxrpc_call *rxrpc_alloc_call(gfp_t);
 675 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
 676                                          struct rxrpc_conn_parameters *,
 677                                          struct sockaddr_rxrpc *,
 678                                          unsigned long, s64, gfp_t);
 679 int rxrpc_retry_client_call(struct rxrpc_sock *,
 680                             struct rxrpc_call *,
 681                             struct rxrpc_conn_parameters *,
 682                             struct sockaddr_rxrpc *,
 683                             gfp_t);
 684 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
 685                          struct sk_buff *);
 686 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
 687 int rxrpc_prepare_call_for_retry(struct rxrpc_sock *, struct rxrpc_call *);
 688 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 689 bool __rxrpc_queue_call(struct rxrpc_call *);
 690 bool rxrpc_queue_call(struct rxrpc_call *);
 691 void rxrpc_see_call(struct rxrpc_call *);
 692 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
 693 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
 694 void rxrpc_cleanup_call(struct rxrpc_call *);
 695 void rxrpc_destroy_all_calls(struct rxrpc_net *);
 696
 697 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
 698 {
 699         return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
 700 }
 701
 702 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
 703 {
 704         return !rxrpc_is_service_call(call);
 705 }
 706
 707 /*
 708  * Transition a call to the complete state.
 709  */
 710 static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
 711                                                enum rxrpc_call_completion compl,
 712                                                u32 abort_code,
 713                                                int error)
 714 {
 715         if (call->state < RXRPC_CALL_COMPLETE) {
 716                 call->abort_code = abort_code;
 717                 call->error = error;
 718                 call->completion = compl,
 719                 call->state = RXRPC_CALL_COMPLETE;
 720                 wake_up(&call->waitq);
 721                 return true;
 722         }
 723         return false;
 724 }
 725
 726 static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
 727                                              enum rxrpc_call_completion compl,
 728                                              u32 abort_code,
 729                                              int error)
 730 {
 731         bool ret;
 732
 733         write_lock_bh(&call->state_lock);
 734         ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
 735         write_unlock_bh(&call->state_lock);
 736         return ret;
 737 }
 738
 739 /*
 740  * Record that a call successfully completed.
 741  */
 742 static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
 743 {
 744         return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
 745 }
 746
 747 static inline bool rxrpc_call_completed(struct rxrpc_call *call)
 748 {
 749         bool ret;
 750
 751         write_lock_bh(&call->state_lock);
 752         ret = __rxrpc_call_completed(call);
 753         write_unlock_bh(&call->state_lock);
 754         return ret;
 755 }
 756
 757 /*
 758  * Record that a call is locally aborted.
 759  */
 760 static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 761                                       rxrpc_seq_t seq,
 762                                       u32 abort_code, int error)
 763 {
 764         trace_rxrpc_abort(why, call->cid, call->call_id, seq,
 765                           abort_code, error);
 766         return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
 767                                            abort_code, error);
 768 }
 769
 770 static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 771                                     rxrpc_seq_t seq, u32 abort_code, int error)
 772 {
 773         bool ret;
 774
 775         write_lock_bh(&call->state_lock);
 776         ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
 777         write_unlock_bh(&call->state_lock);
 778         return ret;
 779 }
 780
 781 /*
 782  * Abort a call due to a protocol error.
 783  */
 784 static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
 785                                         struct sk_buff *skb,
 786                                         const char *eproto_why,
 787                                         const char *why,
 788                                         u32 abort_code)
 789 {
 790         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 791
 792         trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
 793         return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
 794 }
 795
 796 #define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
 797         __rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
 798                              (abort_why), (abort_code))
 799
 800 /*
 801  * conn_client.c
 802  */
 803 extern unsigned int rxrpc_max_client_connections;
 804 extern unsigned int rxrpc_reap_client_connections;
 805 extern unsigned int rxrpc_conn_idle_client_expiry;
 806 extern unsigned int rxrpc_conn_idle_client_fast_expiry;
 807 extern struct idr rxrpc_client_conn_ids;
 808
 809 void rxrpc_destroy_client_conn_ids(void);
 810 int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *,
 811                        struct sockaddr_rxrpc *, gfp_t);
 812 void rxrpc_expose_client_call(struct rxrpc_call *);
 813 void rxrpc_disconnect_client_call(struct rxrpc_call *);
 814 void rxrpc_put_client_conn(struct rxrpc_connection *);
 815 void rxrpc_discard_expired_client_conns(struct work_struct *);
 816 void rxrpc_destroy_all_client_connections(struct rxrpc_net *);
 817
 818 /*
 819  * conn_event.c
 820  */
 821 void rxrpc_process_connection(struct work_struct *);
 822
 823 /*
 824  * conn_object.c
 825  */
 826 extern unsigned int rxrpc_connection_expiry;
 827
 828 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
 829 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
 830                                                    struct sk_buff *);
 831 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
 832 void rxrpc_disconnect_call(struct rxrpc_call *);
 833 void rxrpc_kill_connection(struct rxrpc_connection *);
 834 bool rxrpc_queue_conn(struct rxrpc_connection *);
 835 void rxrpc_see_connection(struct rxrpc_connection *);
 836 void rxrpc_get_connection(struct rxrpc_connection *);
 837 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
 838 void rxrpc_put_service_conn(struct rxrpc_connection *);
 839 void rxrpc_service_connection_reaper(struct work_struct *);
 840 void rxrpc_destroy_all_connections(struct rxrpc_net *);
 841
 842 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
 843 {
 844         return conn->out_clientflag;
 845 }
 846
 847 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
 848 {
 849         return !rxrpc_conn_is_client(conn);
 850 }
 851
 852 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
 853 {
 854         if (!conn)
 855                 return;
 856
 857         if (rxrpc_conn_is_client(conn))
 858                 rxrpc_put_client_conn(conn);
 859         else
 860                 rxrpc_put_service_conn(conn);
 861 }
 862
 863 /*
 864  * conn_service.c
 865  */
 866 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
 867                                                      struct sk_buff *);
 868 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
 869 void rxrpc_new_incoming_connection(struct rxrpc_sock *,
 870                                    struct rxrpc_connection *, struct sk_buff *);
 871 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
 872
 873 /*
 874  * input.c
 875  */
 876 void rxrpc_data_ready(struct sock *);
 877
 878 /*
 879  * insecure.c
 880  */
 881 extern const struct rxrpc_security rxrpc_no_security;
 882
 883 /*
 884  * key.c
 885  */
 886 extern struct key_type key_type_rxrpc;
 887 extern struct key_type key_type_rxrpc_s;
 888
 889 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
 890 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
 891 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
 892                               u32);
 893
 894 /*
 895  * local_event.c
 896  */
 897 extern void rxrpc_process_local_events(struct rxrpc_local *);
 898
 899 /*
 900  * local_object.c
 901  */
 902 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
 903 void __rxrpc_put_local(struct rxrpc_local *);
 904 void rxrpc_destroy_all_locals(struct rxrpc_net *);
 905
 906 static inline void rxrpc_get_local(struct rxrpc_local *local)
 907 {
 908         atomic_inc(&local->usage);
 909 }
 910
 911 static inline
 912 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local)
 913 {
 914         return atomic_inc_not_zero(&local->usage) ? local : NULL;
 915 }
 916
 917 static inline void rxrpc_put_local(struct rxrpc_local *local)
 918 {
 919         if (local && atomic_dec_and_test(&local->usage))
 920                 __rxrpc_put_local(local);
 921 }
 922
 923 static inline void rxrpc_queue_local(struct rxrpc_local *local)
 924 {
 925         rxrpc_queue_work(&local->processor);
 926 }
 927
 928 /*
 929  * misc.c
 930  */
 931 extern unsigned int rxrpc_max_backlog __read_mostly;
 932 extern unsigned int rxrpc_requested_ack_delay;
 933 extern unsigned int rxrpc_soft_ack_delay;
 934 extern unsigned int rxrpc_idle_ack_delay;
 935 extern unsigned int rxrpc_rx_window_size;
 936 extern unsigned int rxrpc_rx_mtu;
 937 extern unsigned int rxrpc_rx_jumbo_max;
 938 extern unsigned int rxrpc_resend_timeout;
 939
 940 extern const s8 rxrpc_ack_priority[];
 941
 942 /*
 943  * net_ns.c
 944  */
 945 extern unsigned int rxrpc_net_id;
 946 extern struct pernet_operations rxrpc_net_ops;
 947
 948 static inline struct rxrpc_net *rxrpc_net(struct net *net)
 949 {
 950         return net_generic(net, rxrpc_net_id);
 951 }
 952
 953 /*
 954  * output.c
 955  */
 956 int rxrpc_send_ack_packet(struct rxrpc_call *, bool);
 957 int rxrpc_send_abort_packet(struct rxrpc_call *);
 958 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
 959 void rxrpc_reject_packets(struct rxrpc_local *);
 960
 961 /*
 962  * peer_event.c
 963  */
 964 void rxrpc_error_report(struct sock *);
 965 void rxrpc_peer_error_distributor(struct work_struct *);
 966 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
 967                         rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
 968
 969 /*
 970  * peer_object.c
 971  */
 972 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
 973                                          const struct sockaddr_rxrpc *);
 974 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *,
 975                                      struct sockaddr_rxrpc *, gfp_t);
 976 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
 977 struct rxrpc_peer *rxrpc_lookup_incoming_peer(struct rxrpc_local *,
 978                                               struct rxrpc_peer *);
 979
 980 static inline struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer)
 981 {
 982         atomic_inc(&peer->usage);
 983         return peer;
 984 }
 985
 986 static inline
 987 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer)
 988 {
 989         return atomic_inc_not_zero(&peer->usage) ? peer : NULL;
 990 }
 991
 992 extern void __rxrpc_put_peer(struct rxrpc_peer *peer);
 993 static inline void rxrpc_put_peer(struct rxrpc_peer *peer)
 994 {
 995         if (peer && atomic_dec_and_test(&peer->usage))
 996                 __rxrpc_put_peer(peer);
 997 }
 998
 999 /*
1000  * proc.c
1001  */
1002 extern const struct file_operations rxrpc_call_seq_fops;
1003 extern const struct file_operations rxrpc_connection_seq_fops;
1004
1005 /*
1006  * recvmsg.c
1007  */
1008 void rxrpc_notify_socket(struct rxrpc_call *);
1009 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1010
1011 /*
1012  * rxkad.c
1013  */
1014 #ifdef CONFIG_RXKAD
1015 extern const struct rxrpc_security rxkad;
1016 #endif
1017
1018 /*
1019  * security.c
1020  */
1021 int __init rxrpc_init_security(void);
1022 void rxrpc_exit_security(void);
1023 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1024 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
1025
1026 /*
1027  * sendmsg.c
1028  */
1029 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1030
1031 /*
1032  * skbuff.c
1033  */
1034 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1035 void rxrpc_packet_destructor(struct sk_buff *);
1036 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1037 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1038 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1039 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1040 void rxrpc_lose_skb(struct sk_buff *, enum rxrpc_skb_trace);
1041 void rxrpc_purge_queue(struct sk_buff_head *);
1042
1043 /*
1044  * sysctl.c
1045  */
1046 #ifdef CONFIG_SYSCTL
1047 extern int __init rxrpc_sysctl_init(void);
1048 extern void rxrpc_sysctl_exit(void);
1049 #else
1050 static inline int __init rxrpc_sysctl_init(void) { return 0; }
1051 static inline void rxrpc_sysctl_exit(void) {}
1052 #endif
1053
1054 /*
1055  * utils.c
1056  */
1057 int rxrpc_extract_addr_from_skb(struct rxrpc_local *, struct sockaddr_rxrpc *,
1058                                 struct sk_buff *);
1059
1060 static inline bool before(u32 seq1, u32 seq2)
1061 {
1062         return (s32)(seq1 - seq2) < 0;
1063 }
1064 static inline bool before_eq(u32 seq1, u32 seq2)
1065 {
1066         return (s32)(seq1 - seq2) <= 0;
1067 }
1068 static inline bool after(u32 seq1, u32 seq2)
1069 {
1070         return (s32)(seq1 - seq2) > 0;
1071 }
1072 static inline bool after_eq(u32 seq1, u32 seq2)
1073 {
1074         return (s32)(seq1 - seq2) >= 0;
1075 }
1076
1077 /*
1078  * debug tracing
1079  */
1080 extern unsigned int rxrpc_debug;
1081
1082 #define dbgprintk(FMT,...) \
1083         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1084
1085 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1086 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1087 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
1088 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
1089 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1090
1091
1092 #if defined(__KDEBUG)
1093 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1094 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1095 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1096 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
1097 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
1098
1099 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1100 #define RXRPC_DEBUG_KENTER      0x01
1101 #define RXRPC_DEBUG_KLEAVE      0x02
1102 #define RXRPC_DEBUG_KDEBUG      0x04
1103 #define RXRPC_DEBUG_KPROTO      0x08
1104 #define RXRPC_DEBUG_KNET        0x10
1105
1106 #define _enter(FMT,...)                                 \
1107 do {                                                    \
1108         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1109                 kenter(FMT,##__VA_ARGS__);              \
1110 } while (0)
1111
1112 #define _leave(FMT,...)                                 \
1113 do {                                                    \
1114         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1115                 kleave(FMT,##__VA_ARGS__);              \
1116 } while (0)
1117
1118 #define _debug(FMT,...)                                 \
1119 do {                                                    \
1120         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1121                 kdebug(FMT,##__VA_ARGS__);              \
1122 } while (0)
1123
1124 #define _proto(FMT,...)                                 \
1125 do {                                                    \
1126         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
1127                 kproto(FMT,##__VA_ARGS__);              \
1128 } while (0)
1129
1130 #define _net(FMT,...)                                   \
1131 do {                                                    \
1132         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
1133                 knet(FMT,##__VA_ARGS__);                \
1134 } while (0)
1135
1136 #else
1137 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1138 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1139 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
1140 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
1141 #define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
1142 #endif
1143
1144 /*
1145  * debug assertion checking
1146  */
1147 #if 1 // defined(__KDEBUGALL)
1148
1149 #define ASSERT(X)                                               \
1150 do {                                                            \
1151         if (unlikely(!(X))) {                                   \
1152                 pr_err("Assertion failed\n");                   \
1153                 BUG();                                          \
1154         }                                                       \
1155 } while (0)
1156
1157 #define ASSERTCMP(X, OP, Y)                                             \
1158 do {                                                                    \
1159         __typeof__(X) _x = (X);                                         \
1160         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1161         if (unlikely(!(_x OP _y))) {                                    \
1162                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1163                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1164                        (unsigned long)_y, (unsigned long)_y);           \
1165                 BUG();                                                  \
1166         }                                                               \
1167 } while (0)
1168
1169 #define ASSERTIF(C, X)                                          \
1170 do {                                                            \
1171         if (unlikely((C) && !(X))) {                            \
1172                 pr_err("Assertion failed\n");                   \
1173                 BUG();                                          \
1174         }                                                       \
1175 } while (0)
1176
1177 #define ASSERTIFCMP(C, X, OP, Y)                                        \
1178 do {                                                                    \
1179         __typeof__(X) _x = (X);                                         \
1180         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1181         if (unlikely((C) && !(_x OP _y))) {                             \
1182                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1183                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1184                        (unsigned long)_y, (unsigned long)_y);           \
1185                 BUG();                                                  \
1186         }                                                               \
1187 } while (0)
1188
1189 #else
1190
1191 #define ASSERT(X)                               \
1192 do {                                            \
1193 } while (0)
1194
1195 #define ASSERTCMP(X, OP, Y)                     \
1196 do {                                            \
1197 } while (0)
1198
1199 #define ASSERTIF(C, X)                          \
1200 do {                                            \
1201 } while (0)
1202
1203 #define ASSERTIFCMP(C, X, OP, Y)                \
1204 do {                                            \
1205 } while (0)
1206
1207 #endif /* __KDEBUGALL */