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 in skb->mark.  skb->priority is used
  44  * to pass supplementary information.
  45  */
  46 enum rxrpc_skb_mark {
  47         RXRPC_SKB_MARK_REJECT_BUSY,     /* Reject with BUSY */
  48         RXRPC_SKB_MARK_REJECT_ABORT,    /* Reject with ABORT (code in skb->priority) */
  49 };
  50
  51 /*
  52  * sk_state for RxRPC sockets
  53  */
  54 enum {
  55         RXRPC_UNBOUND = 0,
  56         RXRPC_CLIENT_UNBOUND,           /* Unbound socket used as client */
  57         RXRPC_CLIENT_BOUND,             /* client local address bound */
  58         RXRPC_SERVER_BOUND,             /* server local address bound */
  59         RXRPC_SERVER_BOUND2,            /* second server local address bound */
  60         RXRPC_SERVER_LISTENING,         /* server listening for connections */
  61         RXRPC_SERVER_LISTEN_DISABLED,   /* server listening disabled */
  62         RXRPC_CLOSE,                    /* socket is being closed */
  63 };
  64
  65 /*
  66  * Per-network namespace data.
  67  */
  68 struct rxrpc_net {
  69         struct proc_dir_entry   *proc_net;      /* Subdir in /proc/net */
  70         u32                     epoch;          /* Local epoch for detecting local-end reset */
  71         struct list_head        calls;          /* List of calls active in this namespace */
  72         rwlock_t                call_lock;      /* Lock for ->calls */
  73         atomic_t                nr_calls;       /* Count of allocated calls */
  74
  75         atomic_t                nr_conns;
  76         struct list_head        conn_proc_list; /* List of conns in this namespace for proc */
  77         struct list_head        service_conns;  /* Service conns in this namespace */
  78         rwlock_t                conn_lock;      /* Lock for ->conn_proc_list, ->service_conns */
  79         struct work_struct      service_conn_reaper;
  80         struct timer_list       service_conn_reap_timer;
  81
  82         unsigned int            nr_client_conns;
  83         unsigned int            nr_active_client_conns;
  84         bool                    kill_all_client_conns;
  85         bool                    live;
  86         spinlock_t              client_conn_cache_lock; /* Lock for ->*_client_conns */
  87         spinlock_t              client_conn_discard_lock; /* Prevent multiple discarders */
  88         struct list_head        waiting_client_conns;
  89         struct list_head        active_client_conns;
  90         struct list_head        idle_client_conns;
  91         struct work_struct      client_conn_reaper;
  92         struct timer_list       client_conn_reap_timer;
  93
  94         struct list_head        local_endpoints;
  95         struct mutex            local_mutex;    /* Lock for ->local_endpoints */
  96
  97         DECLARE_HASHTABLE       (peer_hash, 10);
  98         spinlock_t              peer_hash_lock; /* Lock for ->peer_hash */
  99
 100 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
 101         u8                      peer_keepalive_cursor;
 102         time64_t                peer_keepalive_base;
 103         struct list_head        peer_keepalive[32];
 104         struct list_head        peer_keepalive_new;
 105         struct timer_list       peer_keepalive_timer;
 106         struct work_struct      peer_keepalive_work;
 107 };
 108
 109 /*
 110  * Service backlog preallocation.
 111  *
 112  * This contains circular buffers of preallocated peers, connections and calls
 113  * for incoming service calls and their head and tail pointers.  This allows
 114  * calls to be set up in the data_ready handler, thereby avoiding the need to
 115  * shuffle packets around so much.
 116  */
 117 struct rxrpc_backlog {
 118         unsigned short          peer_backlog_head;
 119         unsigned short          peer_backlog_tail;
 120         unsigned short          conn_backlog_head;
 121         unsigned short          conn_backlog_tail;
 122         unsigned short          call_backlog_head;
 123         unsigned short          call_backlog_tail;
 124 #define RXRPC_BACKLOG_MAX       32
 125         struct rxrpc_peer       *peer_backlog[RXRPC_BACKLOG_MAX];
 126         struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
 127         struct rxrpc_call       *call_backlog[RXRPC_BACKLOG_MAX];
 128 };
 129
 130 /*
 131  * RxRPC socket definition
 132  */
 133 struct rxrpc_sock {
 134         /* WARNING: sk has to be the first member */
 135         struct sock             sk;
 136         rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
 137         rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
 138         struct rxrpc_local      *local;         /* local endpoint */
 139         struct rxrpc_backlog    *backlog;       /* Preallocation for services */
 140         spinlock_t              incoming_lock;  /* Incoming call vs service shutdown lock */
 141         struct list_head        sock_calls;     /* List of calls owned by this socket */
 142         struct list_head        to_be_accepted; /* calls awaiting acceptance */
 143         struct list_head        recvmsg_q;      /* Calls awaiting recvmsg's attention  */
 144         rwlock_t                recvmsg_lock;   /* Lock for recvmsg_q */
 145         struct key              *key;           /* security for this socket */
 146         struct key              *securities;    /* list of server security descriptors */
 147         struct rb_root          calls;          /* User ID -> call mapping */
 148         unsigned long           flags;
 149 #define RXRPC_SOCK_CONNECTED            0       /* connect_srx is set */
 150         rwlock_t                call_lock;      /* lock for calls */
 151         u32                     min_sec_level;  /* minimum security level */
 152 #define RXRPC_SECURITY_MAX      RXRPC_SECURITY_ENCRYPT
 153         bool                    exclusive;      /* Exclusive connection for a client socket */
 154         u16                     second_service; /* Additional service bound to the endpoint */
 155         struct {
 156                 /* Service upgrade information */
 157                 u16             from;           /* Service ID to upgrade (if not 0) */
 158                 u16             to;             /* service ID to upgrade to */
 159         } service_upgrade;
 160         sa_family_t             family;         /* Protocol family created with */
 161         struct sockaddr_rxrpc   srx;            /* Primary Service/local addresses */
 162         struct sockaddr_rxrpc   connect_srx;    /* Default client address from connect() */
 163 };
 164
 165 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
 166
 167 /*
 168  * CPU-byteorder normalised Rx packet header.
 169  */
 170 struct rxrpc_host_header {
 171         u32             epoch;          /* client boot timestamp */
 172         u32             cid;            /* connection and channel ID */
 173         u32             callNumber;     /* call ID (0 for connection-level packets) */
 174         u32             seq;            /* sequence number of pkt in call stream */
 175         u32             serial;         /* serial number of pkt sent to network */
 176         u8              type;           /* packet type */
 177         u8              flags;          /* packet flags */
 178         u8              userStatus;     /* app-layer defined status */
 179         u8              securityIndex;  /* security protocol ID */
 180         union {
 181                 u16     _rsvd;          /* reserved */
 182                 u16     cksum;          /* kerberos security checksum */
 183         };
 184         u16             serviceId;      /* service ID */
 185 } __packed;
 186
 187 /*
 188  * RxRPC socket buffer private variables
 189  * - max 48 bytes (struct sk_buff::cb)
 190  */
 191 struct rxrpc_skb_priv {
 192         union {
 193                 u8              nr_jumbo;       /* Number of jumbo subpackets */
 194         };
 195         union {
 196                 int             remain;         /* amount of space remaining for next write */
 197         };
 198
 199         struct rxrpc_host_header hdr;           /* RxRPC packet header from this packet */
 200 };
 201
 202 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
 203
 204 /*
 205  * RxRPC security module interface
 206  */
 207 struct rxrpc_security {
 208         const char              *name;          /* name of this service */
 209         u8                      security_index; /* security type provided */
 210
 211         /* Initialise a security service */
 212         int (*init)(void);
 213
 214         /* Clean up a security service */
 215         void (*exit)(void);
 216
 217         /* initialise a connection's security */
 218         int (*init_connection_security)(struct rxrpc_connection *);
 219
 220         /* prime a connection's packet security */
 221         int (*prime_packet_security)(struct rxrpc_connection *);
 222
 223         /* impose security on a packet */
 224         int (*secure_packet)(struct rxrpc_call *,
 225                              struct sk_buff *,
 226                              size_t,
 227                              void *);
 228
 229         /* verify the security on a received packet */
 230         int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
 231                              unsigned int, unsigned int, rxrpc_seq_t, u16);
 232
 233         /* Locate the data in a received packet that has been verified. */
 234         void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
 235                             unsigned int *, unsigned int *);
 236
 237         /* issue a challenge */
 238         int (*issue_challenge)(struct rxrpc_connection *);
 239
 240         /* respond to a challenge */
 241         int (*respond_to_challenge)(struct rxrpc_connection *,
 242                                     struct sk_buff *,
 243                                     u32 *);
 244
 245         /* verify a response */
 246         int (*verify_response)(struct rxrpc_connection *,
 247                                struct sk_buff *,
 248                                u32 *);
 249
 250         /* clear connection security */
 251         void (*clear)(struct rxrpc_connection *);
 252 };
 253
 254 /*
 255  * RxRPC local transport endpoint description
 256  * - owned by a single AF_RXRPC socket
 257  * - pointed to by transport socket struct sk_user_data
 258  */
 259 struct rxrpc_local {
 260         struct rcu_head         rcu;
 261         atomic_t                active_users;   /* Number of users of the local endpoint */
 262         atomic_t                usage;          /* Number of references to the structure */
 263         struct rxrpc_net        *rxnet;         /* The network ns in which this resides */
 264         struct list_head        link;
 265         struct socket           *socket;        /* my UDP socket */
 266         struct work_struct      processor;
 267         struct rxrpc_sock __rcu *service;       /* Service(s) listening on this endpoint */
 268         struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
 269         struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
 270         struct sk_buff_head     event_queue;    /* endpoint event packets awaiting processing */
 271         struct rb_root          client_conns;   /* Client connections by socket params */
 272         spinlock_t              client_conns_lock; /* Lock for client_conns */
 273         spinlock_t              lock;           /* access lock */
 274         rwlock_t                services_lock;  /* lock for services list */
 275         int                     debug_id;       /* debug ID for printks */
 276         bool                    dead;
 277         bool                    service_closed; /* Service socket closed */
 278         struct sockaddr_rxrpc   srx;            /* local address */
 279 };
 280
 281 /*
 282  * RxRPC remote transport endpoint definition
 283  * - matched by local endpoint, remote port, address and protocol type
 284  */
 285 struct rxrpc_peer {
 286         struct rcu_head         rcu;            /* This must be first */
 287         atomic_t                usage;
 288         unsigned long           hash_key;
 289         struct hlist_node       hash_link;
 290         struct rxrpc_local      *local;
 291         struct hlist_head       error_targets;  /* targets for net error distribution */
 292         struct rb_root          service_conns;  /* Service connections */
 293         struct list_head        keepalive_link; /* Link in net->peer_keepalive[] */
 294         time64_t                last_tx_at;     /* Last time packet sent here */
 295         seqlock_t               service_conn_lock;
 296         spinlock_t              lock;           /* access lock */
 297         unsigned int            if_mtu;         /* interface MTU for this peer */
 298         unsigned int            mtu;            /* network MTU for this peer */
 299         unsigned int            maxdata;        /* data size (MTU - hdrsize) */
 300         unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
 301         int                     debug_id;       /* debug ID for printks */
 302         struct sockaddr_rxrpc   srx;            /* remote address */
 303
 304         /* calculated RTT cache */
 305 #define RXRPC_RTT_CACHE_SIZE 32
 306         spinlock_t              rtt_input_lock; /* RTT lock for input routine */
 307         ktime_t                 rtt_last_req;   /* Time of last RTT request */
 308         u64                     rtt;            /* Current RTT estimate (in nS) */
 309         u64                     rtt_sum;        /* Sum of cache contents */
 310         u64                     rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */
 311         u8                      rtt_cursor;     /* next entry at which to insert */
 312         u8                      rtt_usage;      /* amount of cache actually used */
 313
 314         u8                      cong_cwnd;      /* Congestion window size */
 315 };
 316
 317 /*
 318  * Keys for matching a connection.
 319  */
 320 struct rxrpc_conn_proto {
 321         union {
 322                 struct {
 323                         u32     epoch;          /* epoch of this connection */
 324                         u32     cid;            /* connection ID */
 325                 };
 326                 u64             index_key;
 327         };
 328 };
 329
 330 struct rxrpc_conn_parameters {
 331         struct rxrpc_local      *local;         /* Representation of local endpoint */
 332         struct rxrpc_peer       *peer;          /* Remote endpoint */
 333         struct key              *key;           /* Security details */
 334         bool                    exclusive;      /* T if conn is exclusive */
 335         bool                    upgrade;        /* T if service ID can be upgraded */
 336         u16                     service_id;     /* Service ID for this connection */
 337         u32                     security_level; /* Security level selected */
 338 };
 339
 340 /*
 341  * Bits in the connection flags.
 342  */
 343 enum rxrpc_conn_flag {
 344         RXRPC_CONN_HAS_IDR,             /* Has a client conn ID assigned */
 345         RXRPC_CONN_IN_SERVICE_CONNS,    /* Conn is in peer->service_conns */
 346         RXRPC_CONN_IN_CLIENT_CONNS,     /* Conn is in local->client_conns */
 347         RXRPC_CONN_EXPOSED,             /* Conn has extra ref for exposure */
 348         RXRPC_CONN_DONT_REUSE,          /* Don't reuse this connection */
 349         RXRPC_CONN_COUNTED,             /* Counted by rxrpc_nr_client_conns */
 350         RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */
 351         RXRPC_CONN_FINAL_ACK_0,         /* Need final ACK for channel 0 */
 352         RXRPC_CONN_FINAL_ACK_1,         /* Need final ACK for channel 1 */
 353         RXRPC_CONN_FINAL_ACK_2,         /* Need final ACK for channel 2 */
 354         RXRPC_CONN_FINAL_ACK_3,         /* Need final ACK for channel 3 */
 355 };
 356
 357 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) |    \
 358                                    (1UL << RXRPC_CONN_FINAL_ACK_1) |    \
 359                                    (1UL << RXRPC_CONN_FINAL_ACK_2) |    \
 360                                    (1UL << RXRPC_CONN_FINAL_ACK_3))
 361
 362 /*
 363  * Events that can be raised upon a connection.
 364  */
 365 enum rxrpc_conn_event {
 366         RXRPC_CONN_EV_CHALLENGE,        /* Send challenge packet */
 367 };
 368
 369 /*
 370  * The connection cache state.
 371  */
 372 enum rxrpc_conn_cache_state {
 373         RXRPC_CONN_CLIENT_INACTIVE,     /* Conn is not yet listed */
 374         RXRPC_CONN_CLIENT_WAITING,      /* Conn is on wait list, waiting for capacity */
 375         RXRPC_CONN_CLIENT_ACTIVE,       /* Conn is on active list, doing calls */
 376         RXRPC_CONN_CLIENT_UPGRADE,      /* Conn is on active list, probing for upgrade */
 377         RXRPC_CONN_CLIENT_CULLED,       /* Conn is culled and delisted, doing calls */
 378         RXRPC_CONN_CLIENT_IDLE,         /* Conn is on idle list, doing mostly nothing */
 379         RXRPC_CONN__NR_CACHE_STATES
 380 };
 381
 382 /*
 383  * The connection protocol state.
 384  */
 385 enum rxrpc_conn_proto_state {
 386         RXRPC_CONN_UNUSED,              /* Connection not yet attempted */
 387         RXRPC_CONN_CLIENT,              /* Client connection */
 388         RXRPC_CONN_SERVICE_PREALLOC,    /* Service connection preallocation */
 389         RXRPC_CONN_SERVICE_UNSECURED,   /* Service unsecured connection */
 390         RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
 391         RXRPC_CONN_SERVICE,             /* Service secured connection */
 392         RXRPC_CONN_REMOTELY_ABORTED,    /* Conn aborted by peer */
 393         RXRPC_CONN_LOCALLY_ABORTED,     /* Conn aborted locally */
 394         RXRPC_CONN__NR_STATES
 395 };
 396
 397 /*
 398  * RxRPC connection definition
 399  * - matched by { local, peer, epoch, conn_id, direction }
 400  * - each connection can only handle four simultaneous calls
 401  */
 402 struct rxrpc_connection {
 403         struct rxrpc_conn_proto proto;
 404         struct rxrpc_conn_parameters params;
 405
 406         atomic_t                usage;
 407         struct rcu_head         rcu;
 408         struct list_head        cache_link;
 409
 410         spinlock_t              channel_lock;
 411         unsigned char           active_chans;   /* Mask of active channels */
 412 #define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1)
 413         struct list_head        waiting_calls;  /* Calls waiting for channels */
 414         struct rxrpc_channel {
 415                 unsigned long           final_ack_at;   /* Time at which to issue final ACK */
 416                 struct rxrpc_call __rcu *call;          /* Active call */
 417                 unsigned int            call_debug_id;  /* call->debug_id */
 418                 u32                     call_id;        /* ID of current call */
 419                 u32                     call_counter;   /* Call ID counter */
 420                 u32                     last_call;      /* ID of last call */
 421                 u8                      last_type;      /* Type of last packet */
 422                 union {
 423                         u32             last_seq;
 424                         u32             last_abort;
 425                 };
 426         } channels[RXRPC_MAXCALLS];
 427
 428         struct timer_list       timer;          /* Conn event timer */
 429         struct work_struct      processor;      /* connection event processor */
 430         union {
 431                 struct rb_node  client_node;    /* Node in local->client_conns */
 432                 struct rb_node  service_node;   /* Node in peer->service_conns */
 433         };
 434         struct list_head        proc_link;      /* link in procfs list */
 435         struct list_head        link;           /* link in master connection list */
 436         struct sk_buff_head     rx_queue;       /* received conn-level packets */
 437         const struct rxrpc_security *security;  /* applied security module */
 438         struct key              *server_key;    /* security for this service */
 439         struct crypto_skcipher  *cipher;        /* encryption handle */
 440         struct rxrpc_crypt      csum_iv;        /* packet checksum base */
 441         unsigned long           flags;
 442         unsigned long           events;
 443         unsigned long           idle_timestamp; /* Time at which last became idle */
 444         spinlock_t              state_lock;     /* state-change lock */
 445         enum rxrpc_conn_cache_state cache_state;
 446         enum rxrpc_conn_proto_state state;      /* current state of connection */
 447         u32                     abort_code;     /* Abort code of connection abort */
 448         int                     debug_id;       /* debug ID for printks */
 449         atomic_t                serial;         /* packet serial number counter */
 450         unsigned int            hi_serial;      /* highest serial number received */
 451         u32                     security_nonce; /* response re-use preventer */
 452         u32                     service_id;     /* Service ID, possibly upgraded */
 453         u8                      size_align;     /* data size alignment (for security) */
 454         u8                      security_size;  /* security header size */
 455         u8                      security_ix;    /* security type */
 456         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
 457         short                   error;          /* Local error code */
 458 };
 459
 460 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
 461 {
 462         return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
 463 }
 464
 465 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
 466 {
 467         return !rxrpc_to_server(sp);
 468 }
 469
 470 /*
 471  * Flags in call->flags.
 472  */
 473 enum rxrpc_call_flag {
 474         RXRPC_CALL_RELEASED,            /* call has been released - no more message to userspace */
 475         RXRPC_CALL_HAS_USERID,          /* has a user ID attached */
 476         RXRPC_CALL_IS_SERVICE,          /* Call is service call */
 477         RXRPC_CALL_EXPOSED,             /* The call was exposed to the world */
 478         RXRPC_CALL_RX_LAST,             /* Received the last packet (at rxtx_top) */
 479         RXRPC_CALL_TX_LAST,             /* Last packet in Tx buffer (at rxtx_top) */
 480         RXRPC_CALL_TX_LASTQ,            /* Last packet has been queued */
 481         RXRPC_CALL_SEND_PING,           /* A ping will need to be sent */
 482         RXRPC_CALL_PINGING,             /* Ping in process */
 483         RXRPC_CALL_RETRANS_TIMEOUT,     /* Retransmission due to timeout occurred */
 484         RXRPC_CALL_BEGAN_RX_TIMER,      /* We began the expect_rx_by timer */
 485         RXRPC_CALL_RX_HEARD,            /* The peer responded at least once to this call */
 486         RXRPC_CALL_RX_UNDERRUN,         /* Got data underrun */
 487         RXRPC_CALL_DISCONNECTED,        /* The call has been disconnected */
 488 };
 489
 490 /*
 491  * Events that can be raised on a call.
 492  */
 493 enum rxrpc_call_event {
 494         RXRPC_CALL_EV_ACK,              /* need to generate ACK */
 495         RXRPC_CALL_EV_ABORT,            /* need to generate abort */
 496         RXRPC_CALL_EV_RESEND,           /* Tx resend required */
 497         RXRPC_CALL_EV_PING,             /* Ping send required */
 498         RXRPC_CALL_EV_EXPIRED,          /* Expiry occurred */
 499         RXRPC_CALL_EV_ACK_LOST,         /* ACK may be lost, send ping */
 500 };
 501
 502 /*
 503  * The states that a call can be in.
 504  */
 505 enum rxrpc_call_state {
 506         RXRPC_CALL_UNINITIALISED,
 507         RXRPC_CALL_CLIENT_AWAIT_CONN,   /* - client waiting for connection to become available */
 508         RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
 509         RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
 510         RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
 511         RXRPC_CALL_SERVER_PREALLOC,     /* - service preallocation */
 512         RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
 513         RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
 514         RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
 515         RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
 516         RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
 517         RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
 518         RXRPC_CALL_COMPLETE,            /* - call complete */
 519         NR__RXRPC_CALL_STATES
 520 };
 521
 522 /*
 523  * Call Tx congestion management modes.
 524  */
 525 enum rxrpc_congest_mode {
 526         RXRPC_CALL_SLOW_START,
 527         RXRPC_CALL_CONGEST_AVOIDANCE,
 528         RXRPC_CALL_PACKET_LOSS,
 529         RXRPC_CALL_FAST_RETRANSMIT,
 530         NR__RXRPC_CONGEST_MODES
 531 };
 532
 533 /*
 534  * RxRPC call definition
 535  * - matched by { connection, call_id }
 536  */
 537 struct rxrpc_call {
 538         struct rcu_head         rcu;
 539         struct rxrpc_connection *conn;          /* connection carrying call */
 540         struct rxrpc_peer       *peer;          /* Peer record for remote address */
 541         struct rxrpc_sock __rcu *socket;        /* socket responsible */
 542         struct rxrpc_net        *rxnet;         /* Network namespace to which call belongs */
 543         struct mutex            user_mutex;     /* User access mutex */
 544         unsigned long           ack_at;         /* When deferred ACK needs to happen */
 545         unsigned long           ack_lost_at;    /* When ACK is figured as lost */
 546         unsigned long           resend_at;      /* When next resend needs to happen */
 547         unsigned long           ping_at;        /* When next to send a ping */
 548         unsigned long           keepalive_at;   /* When next to send a keepalive ping */
 549         unsigned long           expect_rx_by;   /* When we expect to get a packet by */
 550         unsigned long           expect_req_by;  /* When we expect to get a request DATA packet by */
 551         unsigned long           expect_term_by; /* When we expect call termination by */
 552         u32                     next_rx_timo;   /* Timeout for next Rx packet (jif) */
 553         u32                     next_req_timo;  /* Timeout for next Rx request packet (jif) */
 554         struct timer_list       timer;          /* Combined event timer */
 555         struct work_struct      processor;      /* Event processor */
 556         rxrpc_notify_rx_t       notify_rx;      /* kernel service Rx notification function */
 557         struct list_head        link;           /* link in master call list */
 558         struct list_head        chan_wait_link; /* Link in conn->waiting_calls */
 559         struct hlist_node       error_link;     /* link in error distribution list */
 560         struct list_head        accept_link;    /* Link in rx->acceptq */
 561         struct list_head        recvmsg_link;   /* Link in rx->recvmsg_q */
 562         struct list_head        sock_link;      /* Link in rx->sock_calls */
 563         struct rb_node          sock_node;      /* Node in rx->calls */
 564         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
 565         wait_queue_head_t       waitq;          /* Wait queue for channel or Tx */
 566         s64                     tx_total_len;   /* Total length left to be transmitted (or -1) */
 567         __be32                  crypto_buf[2];  /* Temporary packet crypto buffer */
 568         unsigned long           user_call_ID;   /* user-defined call ID */
 569         unsigned long           flags;
 570         unsigned long           events;
 571         spinlock_t              lock;
 572         spinlock_t              notify_lock;    /* Kernel notification lock */
 573         rwlock_t                state_lock;     /* lock for state transition */
 574         u32                     abort_code;     /* Local/remote abort code */
 575         int                     error;          /* Local error incurred */
 576         enum rxrpc_call_state   state;          /* current state of call */
 577         enum rxrpc_call_completion completion;  /* Call completion condition */
 578         atomic_t                usage;
 579         u16                     service_id;     /* service ID */
 580         u8                      security_ix;    /* Security type */
 581         u32                     call_id;        /* call ID on connection  */
 582         u32                     cid;            /* connection ID plus channel index */
 583         int                     debug_id;       /* debug ID for printks */
 584         unsigned short          rx_pkt_offset;  /* Current recvmsg packet offset */
 585         unsigned short          rx_pkt_len;     /* Current recvmsg packet len */
 586
 587         /* Rx/Tx circular buffer, depending on phase.
 588          *
 589          * In the Rx phase, packets are annotated with 0 or the number of the
 590          * segment of a jumbo packet each buffer refers to.  There can be up to
 591          * 47 segments in a maximum-size UDP packet.
 592          *
 593          * In the Tx phase, packets are annotated with which buffers have been
 594          * acked.
 595          */
 596 #define RXRPC_RXTX_BUFF_SIZE    64
 597 #define RXRPC_RXTX_BUFF_MASK    (RXRPC_RXTX_BUFF_SIZE - 1)
 598 #define RXRPC_INIT_RX_WINDOW_SIZE 63
 599         struct sk_buff          **rxtx_buffer;
 600         u8                      *rxtx_annotations;
 601 #define RXRPC_TX_ANNO_ACK       0
 602 #define RXRPC_TX_ANNO_UNACK     1
 603 #define RXRPC_TX_ANNO_NAK       2
 604 #define RXRPC_TX_ANNO_RETRANS   3
 605 #define RXRPC_TX_ANNO_MASK      0x03
 606 #define RXRPC_TX_ANNO_LAST      0x04
 607 #define RXRPC_TX_ANNO_RESENT    0x08
 608
 609 #define RXRPC_RX_ANNO_JUMBO     0x3f            /* Jumbo subpacket number + 1 if not zero */
 610 #define RXRPC_RX_ANNO_JLAST     0x40            /* Set if last element of a jumbo packet */
 611 #define RXRPC_RX_ANNO_VERIFIED  0x80            /* Set if verified and decrypted */
 612         rxrpc_seq_t             tx_hard_ack;    /* Dead slot in buffer; the first transmitted but
 613                                                  * not hard-ACK'd packet follows this.
 614                                                  */
 615         rxrpc_seq_t             tx_top;         /* Highest Tx slot allocated. */
 616         u16                     tx_backoff;     /* Delay to insert due to Tx failure */
 617
 618         /* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
 619          * is fixed, we keep these numbers in terms of segments (ie. DATA
 620          * packets) rather than bytes.
 621          */
 622 #define RXRPC_TX_SMSS           RXRPC_JUMBO_DATALEN
 623         u8                      cong_cwnd;      /* Congestion window size */
 624         u8                      cong_extra;     /* Extra to send for congestion management */
 625         u8                      cong_ssthresh;  /* Slow-start threshold */
 626         enum rxrpc_congest_mode cong_mode:8;    /* Congestion management mode */
 627         u8                      cong_dup_acks;  /* Count of ACKs showing missing packets */
 628         u8                      cong_cumul_acks; /* Cumulative ACK count */
 629         ktime_t                 cong_tstamp;    /* Last time cwnd was changed */
 630
 631         rxrpc_seq_t             rx_hard_ack;    /* Dead slot in buffer; the first received but not
 632                                                  * consumed packet follows this.
 633                                                  */
 634         rxrpc_seq_t             rx_top;         /* Highest Rx slot allocated. */
 635         rxrpc_seq_t             rx_expect_next; /* Expected next packet sequence number */
 636         rxrpc_serial_t          rx_serial;      /* Highest serial received for this call */
 637         u8                      rx_winsize;     /* Size of Rx window */
 638         u8                      tx_winsize;     /* Maximum size of Tx window */
 639         bool                    tx_phase;       /* T if transmission phase, F if receive phase */
 640         u8                      nr_jumbo_bad;   /* Number of jumbo dups/exceeds-windows */
 641
 642         spinlock_t              input_lock;     /* Lock for packet input to this call */
 643
 644         /* receive-phase ACK management */
 645         u8                      ackr_reason;    /* reason to ACK */
 646         u16                     ackr_skew;      /* skew on packet being ACK'd */
 647         rxrpc_serial_t          ackr_serial;    /* serial of packet being ACK'd */
 648         rxrpc_serial_t          ackr_first_seq; /* first sequence number received */
 649         rxrpc_seq_t             ackr_prev_seq;  /* previous sequence number received */
 650         rxrpc_seq_t             ackr_consumed;  /* Highest packet shown consumed */
 651         rxrpc_seq_t             ackr_seen;      /* Highest packet shown seen */
 652
 653         /* ping management */
 654         rxrpc_serial_t          ping_serial;    /* Last ping sent */
 655         ktime_t                 ping_time;      /* Time last ping sent */
 656
 657         /* transmission-phase ACK management */
 658         ktime_t                 acks_latest_ts; /* Timestamp of latest ACK received */
 659         rxrpc_serial_t          acks_latest;    /* serial number of latest ACK received */
 660         rxrpc_seq_t             acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
 661         rxrpc_seq_t             acks_lost_top;  /* tx_top at the time lost-ack ping sent */
 662         rxrpc_serial_t          acks_lost_ping; /* Serial number of probe ACK */
 663 };
 664
 665 /*
 666  * Summary of a new ACK and the changes it made to the Tx buffer packet states.
 667  */
 668 struct rxrpc_ack_summary {
 669         u8                      ack_reason;
 670         u8                      nr_acks;                /* Number of ACKs in packet */
 671         u8                      nr_nacks;               /* Number of NACKs in packet */
 672         u8                      nr_new_acks;            /* Number of new ACKs in packet */
 673         u8                      nr_new_nacks;           /* Number of new NACKs in packet */
 674         u8                      nr_rot_new_acks;        /* Number of rotated new ACKs */
 675         bool                    new_low_nack;           /* T if new low NACK found */
 676         bool                    retrans_timeo;          /* T if reTx due to timeout happened */
 677         u8                      flight_size;            /* Number of unreceived transmissions */
 678         /* Place to stash values for tracing */
 679         enum rxrpc_congest_mode mode:8;
 680         u8                      cwnd;
 681         u8                      ssthresh;
 682         u8                      dup_acks;
 683         u8                      cumulative_acks;
 684 };
 685
 686 /*
 687  * sendmsg() cmsg-specified parameters.
 688  */
 689 enum rxrpc_command {
 690         RXRPC_CMD_SEND_DATA,            /* send data message */
 691         RXRPC_CMD_SEND_ABORT,           /* request abort generation */
 692         RXRPC_CMD_ACCEPT,               /* [server] accept incoming call */
 693         RXRPC_CMD_REJECT_BUSY,          /* [server] reject a call as busy */
 694 };
 695
 696 struct rxrpc_call_params {
 697         s64                     tx_total_len;   /* Total Tx data length (if send data) */
 698         unsigned long           user_call_ID;   /* User's call ID */
 699         struct {
 700                 u32             hard;           /* Maximum lifetime (sec) */
 701                 u32             idle;           /* Max time since last data packet (msec) */
 702                 u32             normal;         /* Max time since last call packet (msec) */
 703         } timeouts;
 704         u8                      nr_timeouts;    /* Number of timeouts specified */
 705 };
 706
 707 struct rxrpc_send_params {
 708         struct rxrpc_call_params call;
 709         u32                     abort_code;     /* Abort code to Tx (if abort) */
 710         enum rxrpc_command      command : 8;    /* The command to implement */
 711         bool                    exclusive;      /* Shared or exclusive call */
 712         bool                    upgrade;        /* If the connection is upgradeable */
 713 };
 714
 715 #include <trace/events/rxrpc.h>
 716
 717 /*
 718  * af_rxrpc.c
 719  */
 720 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
 721 extern struct workqueue_struct *rxrpc_workqueue;
 722
 723 /*
 724  * call_accept.c
 725  */
 726 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
 727 void rxrpc_discard_prealloc(struct rxrpc_sock *);
 728 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
 729                                            struct rxrpc_sock *,
 730                                            struct sk_buff *);
 731 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
 732 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
 733                                      rxrpc_notify_rx_t);
 734 int rxrpc_reject_call(struct rxrpc_sock *);
 735
 736 /*
 737  * call_event.c
 738  */
 739 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
 740                        enum rxrpc_propose_ack_trace);
 741 void rxrpc_process_call(struct work_struct *);
 742
 743 static inline void rxrpc_reduce_call_timer(struct rxrpc_call *call,
 744                                            unsigned long expire_at,
 745                                            unsigned long now,
 746                                            enum rxrpc_timer_trace why)
 747 {
 748         trace_rxrpc_timer(call, why, now);
 749         timer_reduce(&call->timer, expire_at);
 750 }
 751
 752 /*
 753  * call_object.c
 754  */
 755 extern const char *const rxrpc_call_states[];
 756 extern const char *const rxrpc_call_completions[];
 757 extern unsigned int rxrpc_max_call_lifetime;
 758 extern struct kmem_cache *rxrpc_call_jar;
 759
 760 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
 761 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
 762 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
 763                                          struct rxrpc_conn_parameters *,
 764                                          struct sockaddr_rxrpc *,
 765                                          struct rxrpc_call_params *, gfp_t,
 766                                          unsigned int);
 767 int rxrpc_retry_client_call(struct rxrpc_sock *,
 768                             struct rxrpc_call *,
 769                             struct rxrpc_conn_parameters *,
 770                             struct sockaddr_rxrpc *,
 771                             gfp_t);
 772 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
 773                          struct sk_buff *);
 774 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
 775 int rxrpc_prepare_call_for_retry(struct rxrpc_sock *, struct rxrpc_call *);
 776 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 777 bool __rxrpc_queue_call(struct rxrpc_call *);
 778 bool rxrpc_queue_call(struct rxrpc_call *);
 779 void rxrpc_see_call(struct rxrpc_call *);
 780 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
 781 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
 782 void rxrpc_cleanup_call(struct rxrpc_call *);
 783 void rxrpc_destroy_all_calls(struct rxrpc_net *);
 784
 785 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
 786 {
 787         return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
 788 }
 789
 790 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
 791 {
 792         return !rxrpc_is_service_call(call);
 793 }
 794
 795 /*
 796  * Transition a call to the complete state.
 797  */
 798 static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
 799                                                enum rxrpc_call_completion compl,
 800                                                u32 abort_code,
 801                                                int error)
 802 {
 803         if (call->state < RXRPC_CALL_COMPLETE) {
 804                 call->abort_code = abort_code;
 805                 call->error = error;
 806                 call->completion = compl,
 807                 call->state = RXRPC_CALL_COMPLETE;
 808                 trace_rxrpc_call_complete(call);
 809                 wake_up(&call->waitq);
 810                 return true;
 811         }
 812         return false;
 813 }
 814
 815 static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
 816                                              enum rxrpc_call_completion compl,
 817                                              u32 abort_code,
 818                                              int error)
 819 {
 820         bool ret;
 821
 822         write_lock_bh(&call->state_lock);
 823         ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
 824         write_unlock_bh(&call->state_lock);
 825         return ret;
 826 }
 827
 828 /*
 829  * Record that a call successfully completed.
 830  */
 831 static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
 832 {
 833         return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
 834 }
 835
 836 static inline bool rxrpc_call_completed(struct rxrpc_call *call)
 837 {
 838         bool ret;
 839
 840         write_lock_bh(&call->state_lock);
 841         ret = __rxrpc_call_completed(call);
 842         write_unlock_bh(&call->state_lock);
 843         return ret;
 844 }
 845
 846 /*
 847  * Record that a call is locally aborted.
 848  */
 849 static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 850                                       rxrpc_seq_t seq,
 851                                       u32 abort_code, int error)
 852 {
 853         trace_rxrpc_abort(call->debug_id, why, call->cid, call->call_id, seq,
 854                           abort_code, error);
 855         return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
 856                                            abort_code, error);
 857 }
 858
 859 static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 860                                     rxrpc_seq_t seq, u32 abort_code, int error)
 861 {
 862         bool ret;
 863
 864         write_lock_bh(&call->state_lock);
 865         ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
 866         write_unlock_bh(&call->state_lock);
 867         return ret;
 868 }
 869
 870 /*
 871  * Abort a call due to a protocol error.
 872  */
 873 static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
 874                                         struct sk_buff *skb,
 875                                         const char *eproto_why,
 876                                         const char *why,
 877                                         u32 abort_code)
 878 {
 879         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 880
 881         trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
 882         return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
 883 }
 884
 885 #define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
 886         __rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
 887                              (abort_why), (abort_code))
 888
 889 /*
 890  * conn_client.c
 891  */
 892 extern unsigned int rxrpc_max_client_connections;
 893 extern unsigned int rxrpc_reap_client_connections;
 894 extern unsigned long rxrpc_conn_idle_client_expiry;
 895 extern unsigned long rxrpc_conn_idle_client_fast_expiry;
 896 extern struct idr rxrpc_client_conn_ids;
 897
 898 void rxrpc_destroy_client_conn_ids(void);
 899 int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_call *,
 900                        struct rxrpc_conn_parameters *, struct sockaddr_rxrpc *,
 901                        gfp_t);
 902 void rxrpc_expose_client_call(struct rxrpc_call *);
 903 void rxrpc_disconnect_client_call(struct rxrpc_call *);
 904 void rxrpc_put_client_conn(struct rxrpc_connection *);
 905 void rxrpc_discard_expired_client_conns(struct work_struct *);
 906 void rxrpc_destroy_all_client_connections(struct rxrpc_net *);
 907 void rxrpc_clean_up_local_conns(struct rxrpc_local *);
 908
 909 /*
 910  * conn_event.c
 911  */
 912 void rxrpc_process_connection(struct work_struct *);
 913
 914 /*
 915  * conn_object.c
 916  */
 917 extern unsigned int rxrpc_connection_expiry;
 918 extern unsigned int rxrpc_closed_conn_expiry;
 919
 920 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
 921 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
 922                                                    struct sk_buff *,
 923                                                    struct rxrpc_peer **);
 924 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
 925 void rxrpc_disconnect_call(struct rxrpc_call *);
 926 void rxrpc_kill_connection(struct rxrpc_connection *);
 927 bool rxrpc_queue_conn(struct rxrpc_connection *);
 928 void rxrpc_see_connection(struct rxrpc_connection *);
 929 void rxrpc_get_connection(struct rxrpc_connection *);
 930 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
 931 void rxrpc_put_service_conn(struct rxrpc_connection *);
 932 void rxrpc_service_connection_reaper(struct work_struct *);
 933 void rxrpc_destroy_all_connections(struct rxrpc_net *);
 934
 935 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
 936 {
 937         return conn->out_clientflag;
 938 }
 939
 940 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
 941 {
 942         return !rxrpc_conn_is_client(conn);
 943 }
 944
 945 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
 946 {
 947         if (!conn)
 948                 return;
 949
 950         if (rxrpc_conn_is_client(conn))
 951                 rxrpc_put_client_conn(conn);
 952         else
 953                 rxrpc_put_service_conn(conn);
 954 }
 955
 956 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
 957                                            unsigned long expire_at)
 958 {
 959         timer_reduce(&conn->timer, expire_at);
 960 }
 961
 962 /*
 963  * conn_service.c
 964  */
 965 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
 966                                                      struct sk_buff *);
 967 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
 968 void rxrpc_new_incoming_connection(struct rxrpc_sock *,
 969                                    struct rxrpc_connection *, struct sk_buff *);
 970 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
 971
 972 /*
 973  * input.c
 974  */
 975 int rxrpc_input_packet(struct sock *, struct sk_buff *);
 976
 977 /*
 978  * insecure.c
 979  */
 980 extern const struct rxrpc_security rxrpc_no_security;
 981
 982 /*
 983  * key.c
 984  */
 985 extern struct key_type key_type_rxrpc;
 986 extern struct key_type key_type_rxrpc_s;
 987
 988 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
 989 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
 990 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
 991                               u32);
 992
 993 /*
 994  * local_event.c
 995  */
 996 extern void rxrpc_process_local_events(struct rxrpc_local *);
 997
 998 /*
 999  * local_object.c
1000  */
1001 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
1002 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *);
1003 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *);
1004 void rxrpc_put_local(struct rxrpc_local *);
1005 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *);
1006 void rxrpc_unuse_local(struct rxrpc_local *);
1007 void rxrpc_queue_local(struct rxrpc_local *);
1008 void rxrpc_destroy_all_locals(struct rxrpc_net *);
1009
1010 static inline bool __rxrpc_unuse_local(struct rxrpc_local *local)
1011 {
1012         return atomic_dec_return(&local->active_users) == 0;
1013 }
1014
1015 static inline bool __rxrpc_use_local(struct rxrpc_local *local)
1016 {
1017         return atomic_fetch_add_unless(&local->active_users, 1, 0) != 0;
1018 }
1019
1020 /*
1021  * misc.c
1022  */
1023 extern unsigned int rxrpc_max_backlog __read_mostly;
1024 extern unsigned long rxrpc_requested_ack_delay;
1025 extern unsigned long rxrpc_soft_ack_delay;
1026 extern unsigned long rxrpc_idle_ack_delay;
1027 extern unsigned int rxrpc_rx_window_size;
1028 extern unsigned int rxrpc_rx_mtu;
1029 extern unsigned int rxrpc_rx_jumbo_max;
1030 extern unsigned long rxrpc_resend_timeout;
1031
1032 extern const s8 rxrpc_ack_priority[];
1033
1034 /*
1035  * net_ns.c
1036  */
1037 extern unsigned int rxrpc_net_id;
1038 extern struct pernet_operations rxrpc_net_ops;
1039
1040 static inline struct rxrpc_net *rxrpc_net(struct net *net)
1041 {
1042         return net_generic(net, rxrpc_net_id);
1043 }
1044
1045 /*
1046  * output.c
1047  */
1048 int rxrpc_send_ack_packet(struct rxrpc_call *, bool, rxrpc_serial_t *);
1049 int rxrpc_send_abort_packet(struct rxrpc_call *);
1050 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
1051 void rxrpc_reject_packets(struct rxrpc_local *);
1052 void rxrpc_send_keepalive(struct rxrpc_peer *);
1053
1054 /*
1055  * peer_event.c
1056  */
1057 void rxrpc_error_report(struct sock *);
1058 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
1059                         rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1060 void rxrpc_peer_keepalive_worker(struct work_struct *);
1061
1062 /*
1063  * peer_object.c
1064  */
1065 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1066                                          const struct sockaddr_rxrpc *);
1067 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *, struct rxrpc_local *,
1068                                      struct sockaddr_rxrpc *, gfp_t);
1069 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
1070 void rxrpc_new_incoming_peer(struct rxrpc_sock *, struct rxrpc_local *,
1071                              struct rxrpc_peer *);
1072 void rxrpc_destroy_all_peers(struct rxrpc_net *);
1073 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *);
1074 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *);
1075 void rxrpc_put_peer(struct rxrpc_peer *);
1076 void rxrpc_put_peer_locked(struct rxrpc_peer *);
1077
1078 /*
1079  * proc.c
1080  */
1081 extern const struct seq_operations rxrpc_call_seq_ops;
1082 extern const struct seq_operations rxrpc_connection_seq_ops;
1083
1084 /*
1085  * recvmsg.c
1086  */
1087 void rxrpc_notify_socket(struct rxrpc_call *);
1088 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1089
1090 /*
1091  * rxkad.c
1092  */
1093 #ifdef CONFIG_RXKAD
1094 extern const struct rxrpc_security rxkad;
1095 #endif
1096
1097 /*
1098  * security.c
1099  */
1100 int __init rxrpc_init_security(void);
1101 void rxrpc_exit_security(void);
1102 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1103 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
1104
1105 /*
1106  * sendmsg.c
1107  */
1108 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1109
1110 /*
1111  * skbuff.c
1112  */
1113 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1114 void rxrpc_packet_destructor(struct sk_buff *);
1115 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1116 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1117 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1118 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1119 void rxrpc_lose_skb(struct sk_buff *, enum rxrpc_skb_trace);
1120 void rxrpc_purge_queue(struct sk_buff_head *);
1121
1122 /*
1123  * sysctl.c
1124  */
1125 #ifdef CONFIG_SYSCTL
1126 extern int __init rxrpc_sysctl_init(void);
1127 extern void rxrpc_sysctl_exit(void);
1128 #else
1129 static inline int __init rxrpc_sysctl_init(void) { return 0; }
1130 static inline void rxrpc_sysctl_exit(void) {}
1131 #endif
1132
1133 /*
1134  * utils.c
1135  */
1136 int rxrpc_extract_addr_from_skb(struct rxrpc_local *, struct sockaddr_rxrpc *,
1137                                 struct sk_buff *);
1138
1139 static inline bool before(u32 seq1, u32 seq2)
1140 {
1141         return (s32)(seq1 - seq2) < 0;
1142 }
1143 static inline bool before_eq(u32 seq1, u32 seq2)
1144 {
1145         return (s32)(seq1 - seq2) <= 0;
1146 }
1147 static inline bool after(u32 seq1, u32 seq2)
1148 {
1149         return (s32)(seq1 - seq2) > 0;
1150 }
1151 static inline bool after_eq(u32 seq1, u32 seq2)
1152 {
1153         return (s32)(seq1 - seq2) >= 0;
1154 }
1155
1156 /*
1157  * debug tracing
1158  */
1159 extern unsigned int rxrpc_debug;
1160
1161 #define dbgprintk(FMT,...) \
1162         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1163
1164 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1165 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1166 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
1167 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
1168 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1169
1170
1171 #if defined(__KDEBUG)
1172 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1173 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1174 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1175 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
1176 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
1177
1178 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1179 #define RXRPC_DEBUG_KENTER      0x01
1180 #define RXRPC_DEBUG_KLEAVE      0x02
1181 #define RXRPC_DEBUG_KDEBUG      0x04
1182 #define RXRPC_DEBUG_KPROTO      0x08
1183 #define RXRPC_DEBUG_KNET        0x10
1184
1185 #define _enter(FMT,...)                                 \
1186 do {                                                    \
1187         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1188                 kenter(FMT,##__VA_ARGS__);              \
1189 } while (0)
1190
1191 #define _leave(FMT,...)                                 \
1192 do {                                                    \
1193         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1194                 kleave(FMT,##__VA_ARGS__);              \
1195 } while (0)
1196
1197 #define _debug(FMT,...)                                 \
1198 do {                                                    \
1199         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1200                 kdebug(FMT,##__VA_ARGS__);              \
1201 } while (0)
1202
1203 #define _proto(FMT,...)                                 \
1204 do {                                                    \
1205         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
1206                 kproto(FMT,##__VA_ARGS__);              \
1207 } while (0)
1208
1209 #define _net(FMT,...)                                   \
1210 do {                                                    \
1211         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
1212                 knet(FMT,##__VA_ARGS__);                \
1213 } while (0)
1214
1215 #else
1216 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1217 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1218 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
1219 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
1220 #define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
1221 #endif
1222
1223 /*
1224  * debug assertion checking
1225  */
1226 #if 1 // defined(__KDEBUGALL)
1227
1228 #define ASSERT(X)                                               \
1229 do {                                                            \
1230         if (unlikely(!(X))) {                                   \
1231                 pr_err("Assertion failed\n");                   \
1232                 BUG();                                          \
1233         }                                                       \
1234 } while (0)
1235
1236 #define ASSERTCMP(X, OP, Y)                                             \
1237 do {                                                                    \
1238         __typeof__(X) _x = (X);                                         \
1239         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1240         if (unlikely(!(_x OP _y))) {                                    \
1241                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1242                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1243                        (unsigned long)_y, (unsigned long)_y);           \
1244                 BUG();                                                  \
1245         }                                                               \
1246 } while (0)
1247
1248 #define ASSERTIF(C, X)                                          \
1249 do {                                                            \
1250         if (unlikely((C) && !(X))) {                            \
1251                 pr_err("Assertion failed\n");                   \
1252                 BUG();                                          \
1253         }                                                       \
1254 } while (0)
1255
1256 #define ASSERTIFCMP(C, X, OP, Y)                                        \
1257 do {                                                                    \
1258         __typeof__(X) _x = (X);                                         \
1259         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1260         if (unlikely((C) && !(_x OP _y))) {                             \
1261                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1262                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1263                        (unsigned long)_y, (unsigned long)_y);           \
1264                 BUG();                                                  \
1265         }                                                               \
1266 } while (0)
1267
1268 #else
1269
1270 #define ASSERT(X)                               \
1271 do {                                            \
1272 } while (0)
1273
1274 #define ASSERTCMP(X, OP, Y)                     \
1275 do {                                            \
1276 } while (0)
1277
1278 #define ASSERTIF(C, X)                          \
1279 do {                                            \
1280 } while (0)
1281
1282 #define ASSERTIFCMP(C, X, OP, Y)                \
1283 do {                                            \
1284 } while (0)
1285
1286 #endif /* __KDEBUGALL */