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_TX_LASTQ,            /* Last packet has been queued */
 480         RXRPC_CALL_SEND_PING,           /* A ping will need to be sent */
 481         RXRPC_CALL_PINGING,             /* Ping in process */
 482         RXRPC_CALL_RETRANS_TIMEOUT,     /* Retransmission due to timeout occurred */
 483         RXRPC_CALL_BEGAN_RX_TIMER,      /* We began the expect_rx_by timer */
 484         RXRPC_CALL_RX_HEARD,            /* The peer responded at least once to this call */
 485         RXRPC_CALL_RX_UNDERRUN,         /* Got data underrun */
 486 };
 487
 488 /*
 489  * Events that can be raised on a call.
 490  */
 491 enum rxrpc_call_event {
 492         RXRPC_CALL_EV_ACK,              /* need to generate ACK */
 493         RXRPC_CALL_EV_ABORT,            /* need to generate abort */
 494         RXRPC_CALL_EV_RESEND,           /* Tx resend required */
 495         RXRPC_CALL_EV_PING,             /* Ping send required */
 496         RXRPC_CALL_EV_EXPIRED,          /* Expiry occurred */
 497         RXRPC_CALL_EV_ACK_LOST,         /* ACK may be lost, send ping */
 498 };
 499
 500 /*
 501  * The states that a call can be in.
 502  */
 503 enum rxrpc_call_state {
 504         RXRPC_CALL_UNINITIALISED,
 505         RXRPC_CALL_CLIENT_AWAIT_CONN,   /* - client waiting for connection to become available */
 506         RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
 507         RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
 508         RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
 509         RXRPC_CALL_SERVER_PREALLOC,     /* - service preallocation */
 510         RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
 511         RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
 512         RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
 513         RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
 514         RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
 515         RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
 516         RXRPC_CALL_COMPLETE,            /* - call complete */
 517         NR__RXRPC_CALL_STATES
 518 };
 519
 520 /*
 521  * Call Tx congestion management modes.
 522  */
 523 enum rxrpc_congest_mode {
 524         RXRPC_CALL_SLOW_START,
 525         RXRPC_CALL_CONGEST_AVOIDANCE,
 526         RXRPC_CALL_PACKET_LOSS,
 527         RXRPC_CALL_FAST_RETRANSMIT,
 528         NR__RXRPC_CONGEST_MODES
 529 };
 530
 531 /*
 532  * RxRPC call definition
 533  * - matched by { connection, call_id }
 534  */
 535 struct rxrpc_call {
 536         struct rcu_head         rcu;
 537         struct rxrpc_connection *conn;          /* connection carrying call */
 538         struct rxrpc_peer       *peer;          /* Peer record for remote address */
 539         struct rxrpc_sock __rcu *socket;        /* socket responsible */
 540         struct rxrpc_net        *rxnet;         /* Network namespace to which call belongs */
 541         struct mutex            user_mutex;     /* User access mutex */
 542         unsigned long           ack_at;         /* When deferred ACK needs to happen */
 543         unsigned long           ack_lost_at;    /* When ACK is figured as lost */
 544         unsigned long           resend_at;      /* When next resend needs to happen */
 545         unsigned long           ping_at;        /* When next to send a ping */
 546         unsigned long           keepalive_at;   /* When next to send a keepalive ping */
 547         unsigned long           expect_rx_by;   /* When we expect to get a packet by */
 548         unsigned long           expect_req_by;  /* When we expect to get a request DATA packet by */
 549         unsigned long           expect_term_by; /* When we expect call termination by */
 550         u32                     next_rx_timo;   /* Timeout for next Rx packet (jif) */
 551         u32                     next_req_timo;  /* Timeout for next Rx request packet (jif) */
 552         struct timer_list       timer;          /* Combined event timer */
 553         struct work_struct      processor;      /* Event processor */
 554         rxrpc_notify_rx_t       notify_rx;      /* kernel service Rx notification function */
 555         struct list_head        link;           /* link in master call list */
 556         struct list_head        chan_wait_link; /* Link in conn->waiting_calls */
 557         struct hlist_node       error_link;     /* link in error distribution list */
 558         struct list_head        accept_link;    /* Link in rx->acceptq */
 559         struct list_head        recvmsg_link;   /* Link in rx->recvmsg_q */
 560         struct list_head        sock_link;      /* Link in rx->sock_calls */
 561         struct rb_node          sock_node;      /* Node in rx->calls */
 562         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
 563         wait_queue_head_t       waitq;          /* Wait queue for channel or Tx */
 564         s64                     tx_total_len;   /* Total length left to be transmitted (or -1) */
 565         __be32                  crypto_buf[2];  /* Temporary packet crypto buffer */
 566         unsigned long           user_call_ID;   /* user-defined call ID */
 567         unsigned long           flags;
 568         unsigned long           events;
 569         spinlock_t              lock;
 570         spinlock_t              notify_lock;    /* Kernel notification lock */
 571         rwlock_t                state_lock;     /* lock for state transition */
 572         u32                     abort_code;     /* Local/remote abort code */
 573         int                     error;          /* Local error incurred */
 574         enum rxrpc_call_state   state;          /* current state of call */
 575         enum rxrpc_call_completion completion;  /* Call completion condition */
 576         atomic_t                usage;
 577         u16                     service_id;     /* service ID */
 578         u8                      security_ix;    /* Security type */
 579         u32                     call_id;        /* call ID on connection  */
 580         u32                     cid;            /* connection ID plus channel index */
 581         int                     debug_id;       /* debug ID for printks */
 582         unsigned short          rx_pkt_offset;  /* Current recvmsg packet offset */
 583         unsigned short          rx_pkt_len;     /* Current recvmsg packet len */
 584
 585         /* Rx/Tx circular buffer, depending on phase.
 586          *
 587          * In the Rx phase, packets are annotated with 0 or the number of the
 588          * segment of a jumbo packet each buffer refers to.  There can be up to
 589          * 47 segments in a maximum-size UDP packet.
 590          *
 591          * In the Tx phase, packets are annotated with which buffers have been
 592          * acked.
 593          */
 594 #define RXRPC_RXTX_BUFF_SIZE    64
 595 #define RXRPC_RXTX_BUFF_MASK    (RXRPC_RXTX_BUFF_SIZE - 1)
 596 #define RXRPC_INIT_RX_WINDOW_SIZE 63
 597         struct sk_buff          **rxtx_buffer;
 598         u8                      *rxtx_annotations;
 599 #define RXRPC_TX_ANNO_ACK       0
 600 #define RXRPC_TX_ANNO_UNACK     1
 601 #define RXRPC_TX_ANNO_NAK       2
 602 #define RXRPC_TX_ANNO_RETRANS   3
 603 #define RXRPC_TX_ANNO_MASK      0x03
 604 #define RXRPC_TX_ANNO_LAST      0x04
 605 #define RXRPC_TX_ANNO_RESENT    0x08
 606
 607 #define RXRPC_RX_ANNO_JUMBO     0x3f            /* Jumbo subpacket number + 1 if not zero */
 608 #define RXRPC_RX_ANNO_JLAST     0x40            /* Set if last element of a jumbo packet */
 609 #define RXRPC_RX_ANNO_VERIFIED  0x80            /* Set if verified and decrypted */
 610         rxrpc_seq_t             tx_hard_ack;    /* Dead slot in buffer; the first transmitted but
 611                                                  * not hard-ACK'd packet follows this.
 612                                                  */
 613         rxrpc_seq_t             tx_top;         /* Highest Tx slot allocated. */
 614         u16                     tx_backoff;     /* Delay to insert due to Tx failure */
 615
 616         /* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
 617          * is fixed, we keep these numbers in terms of segments (ie. DATA
 618          * packets) rather than bytes.
 619          */
 620 #define RXRPC_TX_SMSS           RXRPC_JUMBO_DATALEN
 621         u8                      cong_cwnd;      /* Congestion window size */
 622         u8                      cong_extra;     /* Extra to send for congestion management */
 623         u8                      cong_ssthresh;  /* Slow-start threshold */
 624         enum rxrpc_congest_mode cong_mode:8;    /* Congestion management mode */
 625         u8                      cong_dup_acks;  /* Count of ACKs showing missing packets */
 626         u8                      cong_cumul_acks; /* Cumulative ACK count */
 627         ktime_t                 cong_tstamp;    /* Last time cwnd was changed */
 628
 629         rxrpc_seq_t             rx_hard_ack;    /* Dead slot in buffer; the first received but not
 630                                                  * consumed packet follows this.
 631                                                  */
 632         rxrpc_seq_t             rx_top;         /* Highest Rx slot allocated. */
 633         rxrpc_seq_t             rx_expect_next; /* Expected next packet sequence number */
 634         rxrpc_serial_t          rx_serial;      /* Highest serial received for this call */
 635         u8                      rx_winsize;     /* Size of Rx window */
 636         u8                      tx_winsize;     /* Maximum size of Tx window */
 637         bool                    tx_phase;       /* T if transmission phase, F if receive phase */
 638         u8                      nr_jumbo_bad;   /* Number of jumbo dups/exceeds-windows */
 639
 640         spinlock_t              input_lock;     /* Lock for packet input to this call */
 641
 642         /* receive-phase ACK management */
 643         u8                      ackr_reason;    /* reason to ACK */
 644         u16                     ackr_skew;      /* skew on packet being ACK'd */
 645         rxrpc_serial_t          ackr_serial;    /* serial of packet being ACK'd */
 646         rxrpc_seq_t             ackr_prev_seq;  /* previous sequence number received */
 647         rxrpc_seq_t             ackr_consumed;  /* Highest packet shown consumed */
 648         rxrpc_seq_t             ackr_seen;      /* Highest packet shown seen */
 649
 650         /* ping management */
 651         rxrpc_serial_t          ping_serial;    /* Last ping sent */
 652         ktime_t                 ping_time;      /* Time last ping sent */
 653
 654         /* transmission-phase ACK management */
 655         ktime_t                 acks_latest_ts; /* Timestamp of latest ACK received */
 656         rxrpc_serial_t          acks_latest;    /* serial number of latest ACK received */
 657         rxrpc_seq_t             acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
 658         rxrpc_seq_t             acks_lost_top;  /* tx_top at the time lost-ack ping sent */
 659         rxrpc_serial_t          acks_lost_ping; /* Serial number of probe ACK */
 660 };
 661
 662 /*
 663  * Summary of a new ACK and the changes it made to the Tx buffer packet states.
 664  */
 665 struct rxrpc_ack_summary {
 666         u8                      ack_reason;
 667         u8                      nr_acks;                /* Number of ACKs in packet */
 668         u8                      nr_nacks;               /* Number of NACKs in packet */
 669         u8                      nr_new_acks;            /* Number of new ACKs in packet */
 670         u8                      nr_new_nacks;           /* Number of new NACKs in packet */
 671         u8                      nr_rot_new_acks;        /* Number of rotated new ACKs */
 672         bool                    new_low_nack;           /* T if new low NACK found */
 673         bool                    retrans_timeo;          /* T if reTx due to timeout happened */
 674         u8                      flight_size;            /* Number of unreceived transmissions */
 675         /* Place to stash values for tracing */
 676         enum rxrpc_congest_mode mode:8;
 677         u8                      cwnd;
 678         u8                      ssthresh;
 679         u8                      dup_acks;
 680         u8                      cumulative_acks;
 681 };
 682
 683 /*
 684  * sendmsg() cmsg-specified parameters.
 685  */
 686 enum rxrpc_command {
 687         RXRPC_CMD_SEND_DATA,            /* send data message */
 688         RXRPC_CMD_SEND_ABORT,           /* request abort generation */
 689         RXRPC_CMD_ACCEPT,               /* [server] accept incoming call */
 690         RXRPC_CMD_REJECT_BUSY,          /* [server] reject a call as busy */
 691 };
 692
 693 struct rxrpc_call_params {
 694         s64                     tx_total_len;   /* Total Tx data length (if send data) */
 695         unsigned long           user_call_ID;   /* User's call ID */
 696         struct {
 697                 u32             hard;           /* Maximum lifetime (sec) */
 698                 u32             idle;           /* Max time since last data packet (msec) */
 699                 u32             normal;         /* Max time since last call packet (msec) */
 700         } timeouts;
 701         u8                      nr_timeouts;    /* Number of timeouts specified */
 702 };
 703
 704 struct rxrpc_send_params {
 705         struct rxrpc_call_params call;
 706         u32                     abort_code;     /* Abort code to Tx (if abort) */
 707         enum rxrpc_command      command : 8;    /* The command to implement */
 708         bool                    exclusive;      /* Shared or exclusive call */
 709         bool                    upgrade;        /* If the connection is upgradeable */
 710 };
 711
 712 #include <trace/events/rxrpc.h>
 713
 714 /*
 715  * af_rxrpc.c
 716  */
 717 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
 718 extern struct workqueue_struct *rxrpc_workqueue;
 719
 720 /*
 721  * call_accept.c
 722  */
 723 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
 724 void rxrpc_discard_prealloc(struct rxrpc_sock *);
 725 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
 726                                            struct rxrpc_sock *,
 727                                            struct sk_buff *);
 728 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
 729 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
 730                                      rxrpc_notify_rx_t);
 731 int rxrpc_reject_call(struct rxrpc_sock *);
 732
 733 /*
 734  * call_event.c
 735  */
 736 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
 737                        enum rxrpc_propose_ack_trace);
 738 void rxrpc_process_call(struct work_struct *);
 739
 740 static inline void rxrpc_reduce_call_timer(struct rxrpc_call *call,
 741                                            unsigned long expire_at,
 742                                            unsigned long now,
 743                                            enum rxrpc_timer_trace why)
 744 {
 745         trace_rxrpc_timer(call, why, now);
 746         timer_reduce(&call->timer, expire_at);
 747 }
 748
 749 /*
 750  * call_object.c
 751  */
 752 extern const char *const rxrpc_call_states[];
 753 extern const char *const rxrpc_call_completions[];
 754 extern unsigned int rxrpc_max_call_lifetime;
 755 extern struct kmem_cache *rxrpc_call_jar;
 756
 757 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
 758 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
 759 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
 760                                          struct rxrpc_conn_parameters *,
 761                                          struct sockaddr_rxrpc *,
 762                                          struct rxrpc_call_params *, gfp_t,
 763                                          unsigned int);
 764 int rxrpc_retry_client_call(struct rxrpc_sock *,
 765                             struct rxrpc_call *,
 766                             struct rxrpc_conn_parameters *,
 767                             struct sockaddr_rxrpc *,
 768                             gfp_t);
 769 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
 770                          struct sk_buff *);
 771 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
 772 int rxrpc_prepare_call_for_retry(struct rxrpc_sock *, struct rxrpc_call *);
 773 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 774 bool __rxrpc_queue_call(struct rxrpc_call *);
 775 bool rxrpc_queue_call(struct rxrpc_call *);
 776 void rxrpc_see_call(struct rxrpc_call *);
 777 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
 778 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
 779 void rxrpc_cleanup_call(struct rxrpc_call *);
 780 void rxrpc_destroy_all_calls(struct rxrpc_net *);
 781
 782 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
 783 {
 784         return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
 785 }
 786
 787 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
 788 {
 789         return !rxrpc_is_service_call(call);
 790 }
 791
 792 /*
 793  * Transition a call to the complete state.
 794  */
 795 static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
 796                                                enum rxrpc_call_completion compl,
 797                                                u32 abort_code,
 798                                                int error)
 799 {
 800         if (call->state < RXRPC_CALL_COMPLETE) {
 801                 call->abort_code = abort_code;
 802                 call->error = error;
 803                 call->completion = compl,
 804                 call->state = RXRPC_CALL_COMPLETE;
 805                 trace_rxrpc_call_complete(call);
 806                 wake_up(&call->waitq);
 807                 return true;
 808         }
 809         return false;
 810 }
 811
 812 static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
 813                                              enum rxrpc_call_completion compl,
 814                                              u32 abort_code,
 815                                              int error)
 816 {
 817         bool ret;
 818
 819         write_lock_bh(&call->state_lock);
 820         ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
 821         write_unlock_bh(&call->state_lock);
 822         return ret;
 823 }
 824
 825 /*
 826  * Record that a call successfully completed.
 827  */
 828 static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
 829 {
 830         return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
 831 }
 832
 833 static inline bool rxrpc_call_completed(struct rxrpc_call *call)
 834 {
 835         bool ret;
 836
 837         write_lock_bh(&call->state_lock);
 838         ret = __rxrpc_call_completed(call);
 839         write_unlock_bh(&call->state_lock);
 840         return ret;
 841 }
 842
 843 /*
 844  * Record that a call is locally aborted.
 845  */
 846 static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 847                                       rxrpc_seq_t seq,
 848                                       u32 abort_code, int error)
 849 {
 850         trace_rxrpc_abort(call->debug_id, why, call->cid, call->call_id, seq,
 851                           abort_code, error);
 852         return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
 853                                            abort_code, error);
 854 }
 855
 856 static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 857                                     rxrpc_seq_t seq, u32 abort_code, int error)
 858 {
 859         bool ret;
 860
 861         write_lock_bh(&call->state_lock);
 862         ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
 863         write_unlock_bh(&call->state_lock);
 864         return ret;
 865 }
 866
 867 /*
 868  * Abort a call due to a protocol error.
 869  */
 870 static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
 871                                         struct sk_buff *skb,
 872                                         const char *eproto_why,
 873                                         const char *why,
 874                                         u32 abort_code)
 875 {
 876         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 877
 878         trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
 879         return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
 880 }
 881
 882 #define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
 883         __rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
 884                              (abort_why), (abort_code))
 885
 886 /*
 887  * conn_client.c
 888  */
 889 extern unsigned int rxrpc_max_client_connections;
 890 extern unsigned int rxrpc_reap_client_connections;
 891 extern unsigned long rxrpc_conn_idle_client_expiry;
 892 extern unsigned long rxrpc_conn_idle_client_fast_expiry;
 893 extern struct idr rxrpc_client_conn_ids;
 894
 895 void rxrpc_destroy_client_conn_ids(void);
 896 int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_call *,
 897                        struct rxrpc_conn_parameters *, struct sockaddr_rxrpc *,
 898                        gfp_t);
 899 void rxrpc_expose_client_call(struct rxrpc_call *);
 900 void rxrpc_disconnect_client_call(struct rxrpc_call *);
 901 void rxrpc_put_client_conn(struct rxrpc_connection *);
 902 void rxrpc_discard_expired_client_conns(struct work_struct *);
 903 void rxrpc_destroy_all_client_connections(struct rxrpc_net *);
 904
 905 /*
 906  * conn_event.c
 907  */
 908 void rxrpc_process_connection(struct work_struct *);
 909
 910 /*
 911  * conn_object.c
 912  */
 913 extern unsigned int rxrpc_connection_expiry;
 914 extern unsigned int rxrpc_closed_conn_expiry;
 915
 916 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
 917 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
 918                                                    struct sk_buff *,
 919                                                    struct rxrpc_peer **);
 920 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
 921 void rxrpc_disconnect_call(struct rxrpc_call *);
 922 void rxrpc_kill_connection(struct rxrpc_connection *);
 923 bool rxrpc_queue_conn(struct rxrpc_connection *);
 924 void rxrpc_see_connection(struct rxrpc_connection *);
 925 void rxrpc_get_connection(struct rxrpc_connection *);
 926 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
 927 void rxrpc_put_service_conn(struct rxrpc_connection *);
 928 void rxrpc_service_connection_reaper(struct work_struct *);
 929 void rxrpc_destroy_all_connections(struct rxrpc_net *);
 930
 931 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
 932 {
 933         return conn->out_clientflag;
 934 }
 935
 936 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
 937 {
 938         return !rxrpc_conn_is_client(conn);
 939 }
 940
 941 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
 942 {
 943         if (!conn)
 944                 return;
 945
 946         if (rxrpc_conn_is_client(conn))
 947                 rxrpc_put_client_conn(conn);
 948         else
 949                 rxrpc_put_service_conn(conn);
 950 }
 951
 952 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
 953                                            unsigned long expire_at)
 954 {
 955         timer_reduce(&conn->timer, expire_at);
 956 }
 957
 958 /*
 959  * conn_service.c
 960  */
 961 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
 962                                                      struct sk_buff *);
 963 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
 964 void rxrpc_new_incoming_connection(struct rxrpc_sock *,
 965                                    struct rxrpc_connection *, struct sk_buff *);
 966 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
 967
 968 /*
 969  * input.c
 970  */
 971 int rxrpc_input_packet(struct sock *, struct sk_buff *);
 972
 973 /*
 974  * insecure.c
 975  */
 976 extern const struct rxrpc_security rxrpc_no_security;
 977
 978 /*
 979  * key.c
 980  */
 981 extern struct key_type key_type_rxrpc;
 982 extern struct key_type key_type_rxrpc_s;
 983
 984 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
 985 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
 986 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
 987                               u32);
 988
 989 /*
 990  * local_event.c
 991  */
 992 extern void rxrpc_process_local_events(struct rxrpc_local *);
 993
 994 /*
 995  * local_object.c
 996  */
 997 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
 998 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *);
 999 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *);
1000 void rxrpc_put_local(struct rxrpc_local *);
1001 void rxrpc_queue_local(struct rxrpc_local *);
1002 void rxrpc_destroy_all_locals(struct rxrpc_net *);
1003
1004 /*
1005  * misc.c
1006  */
1007 extern unsigned int rxrpc_max_backlog __read_mostly;
1008 extern unsigned long rxrpc_requested_ack_delay;
1009 extern unsigned long rxrpc_soft_ack_delay;
1010 extern unsigned long rxrpc_idle_ack_delay;
1011 extern unsigned int rxrpc_rx_window_size;
1012 extern unsigned int rxrpc_rx_mtu;
1013 extern unsigned int rxrpc_rx_jumbo_max;
1014 extern unsigned long rxrpc_resend_timeout;
1015
1016 extern const s8 rxrpc_ack_priority[];
1017
1018 /*
1019  * net_ns.c
1020  */
1021 extern unsigned int rxrpc_net_id;
1022 extern struct pernet_operations rxrpc_net_ops;
1023
1024 static inline struct rxrpc_net *rxrpc_net(struct net *net)
1025 {
1026         return net_generic(net, rxrpc_net_id);
1027 }
1028
1029 /*
1030  * output.c
1031  */
1032 int rxrpc_send_ack_packet(struct rxrpc_call *, bool, rxrpc_serial_t *);
1033 int rxrpc_send_abort_packet(struct rxrpc_call *);
1034 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
1035 void rxrpc_reject_packets(struct rxrpc_local *);
1036 void rxrpc_send_keepalive(struct rxrpc_peer *);
1037
1038 /*
1039  * peer_event.c
1040  */
1041 void rxrpc_error_report(struct sock *);
1042 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
1043                         rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1044 void rxrpc_peer_keepalive_worker(struct work_struct *);
1045
1046 /*
1047  * peer_object.c
1048  */
1049 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1050                                          const struct sockaddr_rxrpc *);
1051 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *, struct rxrpc_local *,
1052                                      struct sockaddr_rxrpc *, gfp_t);
1053 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
1054 void rxrpc_new_incoming_peer(struct rxrpc_sock *, struct rxrpc_local *,
1055                              struct rxrpc_peer *);
1056 void rxrpc_destroy_all_peers(struct rxrpc_net *);
1057 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *);
1058 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *);
1059 void rxrpc_put_peer(struct rxrpc_peer *);
1060
1061 /*
1062  * proc.c
1063  */
1064 extern const struct seq_operations rxrpc_call_seq_ops;
1065 extern const struct seq_operations rxrpc_connection_seq_ops;
1066 extern const struct seq_operations rxrpc_peer_seq_ops;
1067
1068 /*
1069  * recvmsg.c
1070  */
1071 void rxrpc_notify_socket(struct rxrpc_call *);
1072 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1073
1074 /*
1075  * rxkad.c
1076  */
1077 #ifdef CONFIG_RXKAD
1078 extern const struct rxrpc_security rxkad;
1079 #endif
1080
1081 /*
1082  * security.c
1083  */
1084 int __init rxrpc_init_security(void);
1085 void rxrpc_exit_security(void);
1086 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1087 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
1088
1089 /*
1090  * sendmsg.c
1091  */
1092 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1093
1094 /*
1095  * skbuff.c
1096  */
1097 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1098 void rxrpc_packet_destructor(struct sk_buff *);
1099 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1100 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1101 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1102 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1103 void rxrpc_purge_queue(struct sk_buff_head *);
1104
1105 /*
1106  * sysctl.c
1107  */
1108 #ifdef CONFIG_SYSCTL
1109 extern int __init rxrpc_sysctl_init(void);
1110 extern void rxrpc_sysctl_exit(void);
1111 #else
1112 static inline int __init rxrpc_sysctl_init(void) { return 0; }
1113 static inline void rxrpc_sysctl_exit(void) {}
1114 #endif
1115
1116 /*
1117  * utils.c
1118  */
1119 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1120
1121 static inline bool before(u32 seq1, u32 seq2)
1122 {
1123         return (s32)(seq1 - seq2) < 0;
1124 }
1125 static inline bool before_eq(u32 seq1, u32 seq2)
1126 {
1127         return (s32)(seq1 - seq2) <= 0;
1128 }
1129 static inline bool after(u32 seq1, u32 seq2)
1130 {
1131         return (s32)(seq1 - seq2) > 0;
1132 }
1133 static inline bool after_eq(u32 seq1, u32 seq2)
1134 {
1135         return (s32)(seq1 - seq2) >= 0;
1136 }
1137
1138 /*
1139  * debug tracing
1140  */
1141 extern unsigned int rxrpc_debug;
1142
1143 #define dbgprintk(FMT,...) \
1144         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1145
1146 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1147 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1148 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
1149 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
1150 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1151
1152
1153 #if defined(__KDEBUG)
1154 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1155 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1156 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1157 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
1158 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
1159
1160 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1161 #define RXRPC_DEBUG_KENTER      0x01
1162 #define RXRPC_DEBUG_KLEAVE      0x02
1163 #define RXRPC_DEBUG_KDEBUG      0x04
1164 #define RXRPC_DEBUG_KPROTO      0x08
1165 #define RXRPC_DEBUG_KNET        0x10
1166
1167 #define _enter(FMT,...)                                 \
1168 do {                                                    \
1169         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1170                 kenter(FMT,##__VA_ARGS__);              \
1171 } while (0)
1172
1173 #define _leave(FMT,...)                                 \
1174 do {                                                    \
1175         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1176                 kleave(FMT,##__VA_ARGS__);              \
1177 } while (0)
1178
1179 #define _debug(FMT,...)                                 \
1180 do {                                                    \
1181         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1182                 kdebug(FMT,##__VA_ARGS__);              \
1183 } while (0)
1184
1185 #define _proto(FMT,...)                                 \
1186 do {                                                    \
1187         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
1188                 kproto(FMT,##__VA_ARGS__);              \
1189 } while (0)
1190
1191 #define _net(FMT,...)                                   \
1192 do {                                                    \
1193         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
1194                 knet(FMT,##__VA_ARGS__);                \
1195 } while (0)
1196
1197 #else
1198 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1199 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1200 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
1201 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
1202 #define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
1203 #endif
1204
1205 /*
1206  * debug assertion checking
1207  */
1208 #if 1 // defined(__KDEBUGALL)
1209
1210 #define ASSERT(X)                                               \
1211 do {                                                            \
1212         if (unlikely(!(X))) {                                   \
1213                 pr_err("Assertion failed\n");                   \
1214                 BUG();                                          \
1215         }                                                       \
1216 } while (0)
1217
1218 #define ASSERTCMP(X, OP, Y)                                             \
1219 do {                                                                    \
1220         __typeof__(X) _x = (X);                                         \
1221         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1222         if (unlikely(!(_x OP _y))) {                                    \
1223                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1224                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1225                        (unsigned long)_y, (unsigned long)_y);           \
1226                 BUG();                                                  \
1227         }                                                               \
1228 } while (0)
1229
1230 #define ASSERTIF(C, X)                                          \
1231 do {                                                            \
1232         if (unlikely((C) && !(X))) {                            \
1233                 pr_err("Assertion failed\n");                   \
1234                 BUG();                                          \
1235         }                                                       \
1236 } while (0)
1237
1238 #define ASSERTIFCMP(C, X, OP, Y)                                        \
1239 do {                                                                    \
1240         __typeof__(X) _x = (X);                                         \
1241         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1242         if (unlikely((C) && !(_x OP _y))) {                             \
1243                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1244                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1245                        (unsigned long)_y, (unsigned long)_y);           \
1246                 BUG();                                                  \
1247         }                                                               \
1248 } while (0)
1249
1250 #else
1251
1252 #define ASSERT(X)                               \
1253 do {                                            \
1254 } while (0)
1255
1256 #define ASSERTCMP(X, OP, Y)                     \
1257 do {                                            \
1258 } while (0)
1259
1260 #define ASSERTIF(C, X)                          \
1261 do {                                            \
1262 } while (0)
1263
1264 #define ASSERTIFCMP(C, X, OP, Y)                \
1265 do {                                            \
1266 } while (0)
1267
1268 #endif /* __KDEBUGALL */