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