linux/net/rxrpc/ar-internal.h
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   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 <rxrpc/packet.h>
  13
  14#if 0
  15#define CHECK_SLAB_OKAY(X)                                   \
  16        BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
  17               (POISON_FREE << 8 | POISON_FREE))
  18#else
  19#define CHECK_SLAB_OKAY(X) do {} while(0)
  20#endif
  21
  22#define FCRYPT_BSIZE 8
  23struct rxrpc_crypt {
  24        union {
  25                u8      x[FCRYPT_BSIZE];
  26                __be32  n[2];
  27        };
  28} __attribute__((aligned(8)));
  29
  30#define rxrpc_queue_work(WS)    queue_work(rxrpc_workqueue, (WS))
  31#define rxrpc_queue_delayed_work(WS,D)  \
  32        queue_delayed_work(rxrpc_workqueue, (WS), (D))
  33
  34#define rxrpc_queue_call(CALL)  rxrpc_queue_work(&(CALL)->processor)
  35#define rxrpc_queue_conn(CONN)  rxrpc_queue_work(&(CONN)->processor)
  36
  37/*
  38 * sk_state for RxRPC sockets
  39 */
  40enum {
  41        RXRPC_UNCONNECTED = 0,
  42        RXRPC_CLIENT_BOUND,             /* client local address bound */
  43        RXRPC_CLIENT_CONNECTED,         /* client is connected */
  44        RXRPC_SERVER_BOUND,             /* server local address bound */
  45        RXRPC_SERVER_LISTENING,         /* server listening for connections */
  46        RXRPC_CLOSE,                    /* socket is being closed */
  47};
  48
  49/*
  50 * RxRPC socket definition
  51 */
  52struct rxrpc_sock {
  53        /* WARNING: sk has to be the first member */
  54        struct sock             sk;
  55        rxrpc_interceptor_t     interceptor;    /* kernel service Rx interceptor function */
  56        struct rxrpc_local      *local;         /* local endpoint */
  57        struct rxrpc_transport  *trans;         /* transport handler */
  58        struct rxrpc_conn_bundle *bundle;       /* virtual connection bundle */
  59        struct rxrpc_connection *conn;          /* exclusive virtual connection */
  60        struct list_head        listen_link;    /* link in the local endpoint's listen list */
  61        struct list_head        secureq;        /* calls awaiting connection security clearance */
  62        struct list_head        acceptq;        /* calls awaiting acceptance */
  63        struct key              *key;           /* security for this socket */
  64        struct key              *securities;    /* list of server security descriptors */
  65        struct rb_root          calls;          /* outstanding calls on this socket */
  66        unsigned long           flags;
  67#define RXRPC_SOCK_EXCLUSIVE_CONN       1       /* exclusive connection for a client socket */
  68        rwlock_t                call_lock;      /* lock for calls */
  69        u32                     min_sec_level;  /* minimum security level */
  70#define RXRPC_SECURITY_MAX      RXRPC_SECURITY_ENCRYPT
  71        struct sockaddr_rxrpc   srx;            /* local address */
  72        sa_family_t             proto;          /* protocol created with */
  73        __be16                  service_id;     /* service ID of local/remote service */
  74};
  75
  76#define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
  77
  78/*
  79 * RxRPC socket buffer private variables
  80 * - max 48 bytes (struct sk_buff::cb)
  81 */
  82struct rxrpc_skb_priv {
  83        struct rxrpc_call       *call;          /* call with which associated */
  84        unsigned long           resend_at;      /* time in jiffies at which to resend */
  85        union {
  86                unsigned int    offset;         /* offset into buffer of next read */
  87                int             remain;         /* amount of space remaining for next write */
  88                u32             error;          /* network error code */
  89                bool            need_resend;    /* T if needs resending */
  90        };
  91
  92        struct rxrpc_header     hdr;            /* RxRPC packet header from this packet */
  93};
  94
  95#define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
  96
  97enum rxrpc_command {
  98        RXRPC_CMD_SEND_DATA,            /* send data message */
  99        RXRPC_CMD_SEND_ABORT,           /* request abort generation */
 100        RXRPC_CMD_ACCEPT,               /* [server] accept incoming call */
 101        RXRPC_CMD_REJECT_BUSY,          /* [server] reject a call as busy */
 102};
 103
 104/*
 105 * RxRPC security module interface
 106 */
 107struct rxrpc_security {
 108        struct module           *owner;         /* providing module */
 109        struct list_head        link;           /* link in master list */
 110        const char              *name;          /* name of this service */
 111        u8                      security_index; /* security type provided */
 112
 113        /* initialise a connection's security */
 114        int (*init_connection_security)(struct rxrpc_connection *);
 115
 116        /* prime a connection's packet security */
 117        void (*prime_packet_security)(struct rxrpc_connection *);
 118
 119        /* impose security on a packet */
 120        int (*secure_packet)(const struct rxrpc_call *,
 121                             struct sk_buff *,
 122                             size_t,
 123                             void *);
 124
 125        /* verify the security on a received packet */
 126        int (*verify_packet)(const struct rxrpc_call *, struct sk_buff *,
 127                             u32 *);
 128
 129        /* issue a challenge */
 130        int (*issue_challenge)(struct rxrpc_connection *);
 131
 132        /* respond to a challenge */
 133        int (*respond_to_challenge)(struct rxrpc_connection *,
 134                                    struct sk_buff *,
 135                                    u32 *);
 136
 137        /* verify a response */
 138        int (*verify_response)(struct rxrpc_connection *,
 139                               struct sk_buff *,
 140                               u32 *);
 141
 142        /* clear connection security */
 143        void (*clear)(struct rxrpc_connection *);
 144};
 145
 146/*
 147 * RxRPC local transport endpoint definition
 148 * - matched by local port, address and protocol type
 149 */
 150struct rxrpc_local {
 151        struct socket           *socket;        /* my UDP socket */
 152        struct work_struct      destroyer;      /* endpoint destroyer */
 153        struct work_struct      acceptor;       /* incoming call processor */
 154        struct work_struct      rejecter;       /* packet reject writer */
 155        struct list_head        services;       /* services listening on this endpoint */
 156        struct list_head        link;           /* link in endpoint list */
 157        struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
 158        struct sk_buff_head     accept_queue;   /* incoming calls awaiting acceptance */
 159        struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
 160        spinlock_t              lock;           /* access lock */
 161        rwlock_t                services_lock;  /* lock for services list */
 162        atomic_t                usage;
 163        int                     debug_id;       /* debug ID for printks */
 164        volatile char           error_rcvd;     /* T if received ICMP error outstanding */
 165        struct sockaddr_rxrpc   srx;            /* local address */
 166};
 167
 168/*
 169 * RxRPC remote transport endpoint definition
 170 * - matched by remote port, address and protocol type
 171 * - holds the connection ID counter for connections between the two endpoints
 172 */
 173struct rxrpc_peer {
 174        struct work_struct      destroyer;      /* peer destroyer */
 175        struct list_head        link;           /* link in master peer list */
 176        struct list_head        error_targets;  /* targets for net error distribution */
 177        spinlock_t              lock;           /* access lock */
 178        atomic_t                usage;
 179        unsigned int            if_mtu;         /* interface MTU for this peer */
 180        unsigned int            mtu;            /* network MTU for this peer */
 181        unsigned int            maxdata;        /* data size (MTU - hdrsize) */
 182        unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
 183        int                     debug_id;       /* debug ID for printks */
 184        int                     net_error;      /* network error distributed */
 185        struct sockaddr_rxrpc   srx;            /* remote address */
 186
 187        /* calculated RTT cache */
 188#define RXRPC_RTT_CACHE_SIZE 32
 189        suseconds_t             rtt;            /* current RTT estimate (in uS) */
 190        unsigned int            rtt_point;      /* next entry at which to insert */
 191        unsigned int            rtt_usage;      /* amount of cache actually used */
 192        suseconds_t             rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* calculated RTT cache */
 193};
 194
 195/*
 196 * RxRPC point-to-point transport / connection manager definition
 197 * - handles a bundle of connections between two endpoints
 198 * - matched by { local, peer }
 199 */
 200struct rxrpc_transport {
 201        struct rxrpc_local      *local;         /* local transport endpoint */
 202        struct rxrpc_peer       *peer;          /* remote transport endpoint */
 203        struct work_struct      error_handler;  /* network error distributor */
 204        struct rb_root          bundles;        /* client connection bundles on this transport */
 205        struct rb_root          client_conns;   /* client connections on this transport */
 206        struct rb_root          server_conns;   /* server connections on this transport */
 207        struct list_head        link;           /* link in master session list */
 208        struct sk_buff_head     error_queue;    /* error packets awaiting processing */
 209        time_t                  put_time;       /* time at which to reap */
 210        spinlock_t              client_lock;    /* client connection allocation lock */
 211        rwlock_t                conn_lock;      /* lock for active/dead connections */
 212        atomic_t                usage;
 213        int                     debug_id;       /* debug ID for printks */
 214        unsigned int            conn_idcounter; /* connection ID counter (client) */
 215};
 216
 217/*
 218 * RxRPC client connection bundle
 219 * - matched by { transport, service_id, key }
 220 */
 221struct rxrpc_conn_bundle {
 222        struct rb_node          node;           /* node in transport's lookup tree */
 223        struct list_head        unused_conns;   /* unused connections in this bundle */
 224        struct list_head        avail_conns;    /* available connections in this bundle */
 225        struct list_head        busy_conns;     /* busy connections in this bundle */
 226        struct key              *key;           /* security for this bundle */
 227        wait_queue_head_t       chanwait;       /* wait for channel to become available */
 228        atomic_t                usage;
 229        int                     debug_id;       /* debug ID for printks */
 230        unsigned short          num_conns;      /* number of connections in this bundle */
 231        __be16                  service_id;     /* service ID */
 232        u8                      security_ix;    /* security type */
 233};
 234
 235/*
 236 * RxRPC connection definition
 237 * - matched by { transport, service_id, conn_id, direction, key }
 238 * - each connection can only handle four simultaneous calls
 239 */
 240struct rxrpc_connection {
 241        struct rxrpc_transport  *trans;         /* transport session */
 242        struct rxrpc_conn_bundle *bundle;       /* connection bundle (client) */
 243        struct work_struct      processor;      /* connection event processor */
 244        struct rb_node          node;           /* node in transport's lookup tree */
 245        struct list_head        link;           /* link in master connection list */
 246        struct list_head        bundle_link;    /* link in bundle */
 247        struct rb_root          calls;          /* calls on this connection */
 248        struct sk_buff_head     rx_queue;       /* received conn-level packets */
 249        struct rxrpc_call       *channels[RXRPC_MAXCALLS]; /* channels (active calls) */
 250        struct rxrpc_security   *security;      /* applied security module */
 251        struct key              *key;           /* security for this connection (client) */
 252        struct key              *server_key;    /* security for this service */
 253        struct crypto_blkcipher *cipher;        /* encryption handle */
 254        struct rxrpc_crypt      csum_iv;        /* packet checksum base */
 255        unsigned long           events;
 256#define RXRPC_CONN_CHALLENGE    0               /* send challenge packet */
 257        time_t                  put_time;       /* time at which to reap */
 258        rwlock_t                lock;           /* access lock */
 259        spinlock_t              state_lock;     /* state-change lock */
 260        atomic_t                usage;
 261        u32                     real_conn_id;   /* connection ID (host-endian) */
 262        enum {                                  /* current state of connection */
 263                RXRPC_CONN_UNUSED,              /* - connection not yet attempted */
 264                RXRPC_CONN_CLIENT,              /* - client connection */
 265                RXRPC_CONN_SERVER_UNSECURED,    /* - server unsecured connection */
 266                RXRPC_CONN_SERVER_CHALLENGING,  /* - server challenging for security */
 267                RXRPC_CONN_SERVER,              /* - server secured connection */
 268                RXRPC_CONN_REMOTELY_ABORTED,    /* - conn aborted by peer */
 269                RXRPC_CONN_LOCALLY_ABORTED,     /* - conn aborted locally */
 270                RXRPC_CONN_NETWORK_ERROR,       /* - conn terminated by network error */
 271        } state;
 272        int                     error;          /* error code for local abort */
 273        int                     debug_id;       /* debug ID for printks */
 274        unsigned int            call_counter;   /* call ID counter */
 275        atomic_t                serial;         /* packet serial number counter */
 276        atomic_t                hi_serial;      /* highest serial number received */
 277        u8                      avail_calls;    /* number of calls available */
 278        u8                      size_align;     /* data size alignment (for security) */
 279        u8                      header_size;    /* rxrpc + security header size */
 280        u8                      security_size;  /* security header size */
 281        u32                     security_level; /* security level negotiated */
 282        u32                     security_nonce; /* response re-use preventer */
 283
 284        /* the following are all in net order */
 285        __be32                  epoch;          /* epoch of this connection */
 286        __be32                  cid;            /* connection ID */
 287        __be16                  service_id;     /* service ID */
 288        u8                      security_ix;    /* security type */
 289        u8                      in_clientflag;  /* RXRPC_CLIENT_INITIATED if we are server */
 290        u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
 291};
 292
 293/*
 294 * RxRPC call definition
 295 * - matched by { connection, call_id }
 296 */
 297struct rxrpc_call {
 298        struct rxrpc_connection *conn;          /* connection carrying call */
 299        struct rxrpc_sock       *socket;        /* socket responsible */
 300        struct timer_list       lifetimer;      /* lifetime remaining on call */
 301        struct timer_list       deadspan;       /* reap timer for re-ACK'ing, etc  */
 302        struct timer_list       ack_timer;      /* ACK generation timer */
 303        struct timer_list       resend_timer;   /* Tx resend timer */
 304        struct work_struct      destroyer;      /* call destroyer */
 305        struct work_struct      processor;      /* packet processor and ACK generator */
 306        struct list_head        link;           /* link in master call list */
 307        struct list_head        error_link;     /* link in error distribution list */
 308        struct list_head        accept_link;    /* calls awaiting acceptance */
 309        struct rb_node          sock_node;      /* node in socket call tree */
 310        struct rb_node          conn_node;      /* node in connection call tree */
 311        struct sk_buff_head     rx_queue;       /* received packets */
 312        struct sk_buff_head     rx_oos_queue;   /* packets received out of sequence */
 313        struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
 314        wait_queue_head_t       tx_waitq;       /* wait for Tx window space to become available */
 315        unsigned long           user_call_ID;   /* user-defined call ID */
 316        unsigned long           creation_jif;   /* time of call creation */
 317        unsigned long           flags;
 318#define RXRPC_CALL_RELEASED     0       /* call has been released - no more message to userspace */
 319#define RXRPC_CALL_TERMINAL_MSG 1       /* call has given the socket its final message */
 320#define RXRPC_CALL_RCVD_LAST    2       /* all packets received */
 321#define RXRPC_CALL_RUN_RTIMER   3       /* Tx resend timer started */
 322#define RXRPC_CALL_TX_SOFT_ACK  4       /* sent some soft ACKs */
 323#define RXRPC_CALL_PROC_BUSY    5       /* the processor is busy */
 324#define RXRPC_CALL_INIT_ACCEPT  6       /* acceptance was initiated */
 325#define RXRPC_CALL_HAS_USERID   7       /* has a user ID attached */
 326#define RXRPC_CALL_EXPECT_OOS   8       /* expect out of sequence packets */
 327        unsigned long           events;
 328#define RXRPC_CALL_RCVD_ACKALL  0       /* ACKALL or reply received */
 329#define RXRPC_CALL_RCVD_BUSY    1       /* busy packet received */
 330#define RXRPC_CALL_RCVD_ABORT   2       /* abort packet received */
 331#define RXRPC_CALL_RCVD_ERROR   3       /* network error received */
 332#define RXRPC_CALL_ACK_FINAL    4       /* need to generate final ACK (and release call) */
 333#define RXRPC_CALL_ACK          5       /* need to generate ACK */
 334#define RXRPC_CALL_REJECT_BUSY  6       /* need to generate busy message */
 335#define RXRPC_CALL_ABORT        7       /* need to generate abort */
 336#define RXRPC_CALL_CONN_ABORT   8       /* local connection abort generated */
 337#define RXRPC_CALL_RESEND_TIMER 9       /* Tx resend timer expired */
 338#define RXRPC_CALL_RESEND       10      /* Tx resend required */
 339#define RXRPC_CALL_DRAIN_RX_OOS 11      /* drain the Rx out of sequence queue */
 340#define RXRPC_CALL_LIFE_TIMER   12      /* call's lifetimer ran out */
 341#define RXRPC_CALL_ACCEPTED     13      /* incoming call accepted by userspace app */
 342#define RXRPC_CALL_SECURED      14      /* incoming call's connection is now secure */
 343#define RXRPC_CALL_POST_ACCEPT  15      /* need to post an "accept?" message to the app */
 344#define RXRPC_CALL_RELEASE      16      /* need to release the call's resources */
 345
 346        spinlock_t              lock;
 347        rwlock_t                state_lock;     /* lock for state transition */
 348        atomic_t                usage;
 349        atomic_t                sequence;       /* Tx data packet sequence counter */
 350        u32                     abort_code;     /* local/remote abort code */
 351        enum {                                  /* current state of call */
 352                RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
 353                RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
 354                RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
 355                RXRPC_CALL_CLIENT_FINAL_ACK,    /* - client sending final ACK phase */
 356                RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
 357                RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
 358                RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
 359                RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
 360                RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
 361                RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
 362                RXRPC_CALL_COMPLETE,            /* - call completed */
 363                RXRPC_CALL_SERVER_BUSY,         /* - call rejected by busy server */
 364                RXRPC_CALL_REMOTELY_ABORTED,    /* - call aborted by peer */
 365                RXRPC_CALL_LOCALLY_ABORTED,     /* - call aborted locally on error or close */
 366                RXRPC_CALL_NETWORK_ERROR,       /* - call terminated by network error */
 367                RXRPC_CALL_DEAD,                /* - call is dead */
 368        } state;
 369        int                     debug_id;       /* debug ID for printks */
 370        u8                      channel;        /* connection channel occupied by this call */
 371
 372        /* transmission-phase ACK management */
 373        u8                      acks_head;      /* offset into window of first entry */
 374        u8                      acks_tail;      /* offset into window of last entry */
 375        u8                      acks_winsz;     /* size of un-ACK'd window */
 376        u8                      acks_unacked;   /* lowest unacked packet in last ACK received */
 377        int                     acks_latest;    /* serial number of latest ACK received */
 378        rxrpc_seq_t             acks_hard;      /* highest definitively ACK'd msg seq */
 379        unsigned long           *acks_window;   /* sent packet window
 380                                                 * - elements are pointers with LSB set if ACK'd
 381                                                 */
 382
 383        /* receive-phase ACK management */
 384        rxrpc_seq_t             rx_data_expect; /* next data seq ID expected to be received */
 385        rxrpc_seq_t             rx_data_post;   /* next data seq ID expected to be posted */
 386        rxrpc_seq_t             rx_data_recv;   /* last data seq ID encountered by recvmsg */
 387        rxrpc_seq_t             rx_data_eaten;  /* last data seq ID consumed by recvmsg */
 388        rxrpc_seq_t             rx_first_oos;   /* first packet in rx_oos_queue (or 0) */
 389        rxrpc_seq_t             ackr_win_top;   /* top of ACK window (rx_data_eaten is bottom) */
 390        rxrpc_seq_net_t         ackr_prev_seq;  /* previous sequence number received */
 391        u8                      ackr_reason;    /* reason to ACK */
 392        __be32                  ackr_serial;    /* serial of packet being ACK'd */
 393        atomic_t                ackr_not_idle;  /* number of packets in Rx queue */
 394
 395        /* received packet records, 1 bit per record */
 396#define RXRPC_ACKR_WINDOW_ASZ DIV_ROUND_UP(RXRPC_MAXACKS, BITS_PER_LONG)
 397        unsigned long           ackr_window[RXRPC_ACKR_WINDOW_ASZ + 1];
 398
 399        /* the following should all be in net order */
 400        __be32                  cid;            /* connection ID + channel index  */
 401        __be32                  call_id;        /* call ID on connection  */
 402};
 403
 404/*
 405 * locally abort an RxRPC call
 406 */
 407static inline void rxrpc_abort_call(struct rxrpc_call *call, u32 abort_code)
 408{
 409        write_lock_bh(&call->state_lock);
 410        if (call->state < RXRPC_CALL_COMPLETE) {
 411                call->abort_code = abort_code;
 412                call->state = RXRPC_CALL_LOCALLY_ABORTED;
 413                set_bit(RXRPC_CALL_ABORT, &call->events);
 414        }
 415        write_unlock_bh(&call->state_lock);
 416}
 417
 418/*
 419 * af_rxrpc.c
 420 */
 421extern atomic_t rxrpc_n_skbs;
 422extern __be32 rxrpc_epoch;
 423extern atomic_t rxrpc_debug_id;
 424extern struct workqueue_struct *rxrpc_workqueue;
 425
 426/*
 427 * ar-accept.c
 428 */
 429extern void rxrpc_accept_incoming_calls(struct work_struct *);
 430extern struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *,
 431                                            unsigned long);
 432extern int rxrpc_reject_call(struct rxrpc_sock *);
 433
 434/*
 435 * ar-ack.c
 436 */
 437extern void __rxrpc_propose_ACK(struct rxrpc_call *, u8, __be32, bool);
 438extern void rxrpc_propose_ACK(struct rxrpc_call *, u8, __be32, bool);
 439extern void rxrpc_process_call(struct work_struct *);
 440
 441/*
 442 * ar-call.c
 443 */
 444extern struct kmem_cache *rxrpc_call_jar;
 445extern struct list_head rxrpc_calls;
 446extern rwlock_t rxrpc_call_lock;
 447
 448extern struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *,
 449                                                struct rxrpc_transport *,
 450                                                struct rxrpc_conn_bundle *,
 451                                                unsigned long, int, gfp_t);
 452extern struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *,
 453                                              struct rxrpc_connection *,
 454                                              struct rxrpc_header *, gfp_t);
 455extern struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *,
 456                                                 unsigned long);
 457extern void rxrpc_release_call(struct rxrpc_call *);
 458extern void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 459extern void __rxrpc_put_call(struct rxrpc_call *);
 460extern void __exit rxrpc_destroy_all_calls(void);
 461
 462/*
 463 * ar-connection.c
 464 */
 465extern struct list_head rxrpc_connections;
 466extern rwlock_t rxrpc_connection_lock;
 467
 468extern struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *,
 469                                                  struct rxrpc_transport *,
 470                                                  struct key *,
 471                                                  __be16, gfp_t);
 472extern void rxrpc_put_bundle(struct rxrpc_transport *,
 473                             struct rxrpc_conn_bundle *);
 474extern int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_transport *,
 475                              struct rxrpc_conn_bundle *, struct rxrpc_call *,
 476                              gfp_t);
 477extern void rxrpc_put_connection(struct rxrpc_connection *);
 478extern void __exit rxrpc_destroy_all_connections(void);
 479extern struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *,
 480                                                      struct rxrpc_header *);
 481extern struct rxrpc_connection *
 482rxrpc_incoming_connection(struct rxrpc_transport *, struct rxrpc_header *,
 483                          gfp_t);
 484
 485/*
 486 * ar-connevent.c
 487 */
 488extern void rxrpc_process_connection(struct work_struct *);
 489extern void rxrpc_reject_packet(struct rxrpc_local *, struct sk_buff *);
 490extern void rxrpc_reject_packets(struct work_struct *);
 491
 492/*
 493 * ar-error.c
 494 */
 495extern void rxrpc_UDP_error_report(struct sock *);
 496extern void rxrpc_UDP_error_handler(struct work_struct *);
 497
 498/*
 499 * ar-input.c
 500 */
 501extern unsigned long rxrpc_ack_timeout;
 502extern const char *rxrpc_pkts[];
 503
 504extern void rxrpc_data_ready(struct sock *, int);
 505extern int rxrpc_queue_rcv_skb(struct rxrpc_call *, struct sk_buff *, bool,
 506                               bool);
 507extern void rxrpc_fast_process_packet(struct rxrpc_call *, struct sk_buff *);
 508
 509/*
 510 * ar-local.c
 511 */
 512extern rwlock_t rxrpc_local_lock;
 513extern struct rxrpc_local *rxrpc_lookup_local(struct sockaddr_rxrpc *);
 514extern void rxrpc_put_local(struct rxrpc_local *);
 515extern void __exit rxrpc_destroy_all_locals(void);
 516
 517/*
 518 * ar-key.c
 519 */
 520extern struct key_type key_type_rxrpc;
 521extern struct key_type key_type_rxrpc_s;
 522
 523extern int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
 524extern int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
 525extern int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *,
 526                                     time_t, u32);
 527
 528/*
 529 * ar-output.c
 530 */
 531extern int rxrpc_resend_timeout;
 532
 533extern int rxrpc_send_packet(struct rxrpc_transport *, struct sk_buff *);
 534extern int rxrpc_client_sendmsg(struct kiocb *, struct rxrpc_sock *,
 535                                struct rxrpc_transport *, struct msghdr *,
 536                                size_t);
 537extern int rxrpc_server_sendmsg(struct kiocb *, struct rxrpc_sock *,
 538                                struct msghdr *, size_t);
 539
 540/*
 541 * ar-peer.c
 542 */
 543extern struct rxrpc_peer *rxrpc_get_peer(struct sockaddr_rxrpc *, gfp_t);
 544extern void rxrpc_put_peer(struct rxrpc_peer *);
 545extern struct rxrpc_peer *rxrpc_find_peer(struct rxrpc_local *,
 546                                          __be32, __be16);
 547extern void __exit rxrpc_destroy_all_peers(void);
 548
 549/*
 550 * ar-proc.c
 551 */
 552extern const char *const rxrpc_call_states[];
 553extern const struct file_operations rxrpc_call_seq_fops;
 554extern const struct file_operations rxrpc_connection_seq_fops;
 555
 556/*
 557 * ar-recvmsg.c
 558 */
 559extern void rxrpc_remove_user_ID(struct rxrpc_sock *, struct rxrpc_call *);
 560extern int rxrpc_recvmsg(struct kiocb *, struct socket *, struct msghdr *,
 561                         size_t, int);
 562
 563/*
 564 * ar-security.c
 565 */
 566extern int rxrpc_register_security(struct rxrpc_security *);
 567extern void rxrpc_unregister_security(struct rxrpc_security *);
 568extern int rxrpc_init_client_conn_security(struct rxrpc_connection *);
 569extern int rxrpc_init_server_conn_security(struct rxrpc_connection *);
 570extern int rxrpc_secure_packet(const struct rxrpc_call *, struct sk_buff *,
 571                               size_t, void *);
 572extern int rxrpc_verify_packet(const struct rxrpc_call *, struct sk_buff *,
 573                               u32 *);
 574extern void rxrpc_clear_conn_security(struct rxrpc_connection *);
 575
 576/*
 577 * ar-skbuff.c
 578 */
 579extern void rxrpc_packet_destructor(struct sk_buff *);
 580
 581/*
 582 * ar-transport.c
 583 */
 584extern struct rxrpc_transport *rxrpc_get_transport(struct rxrpc_local *,
 585                                                   struct rxrpc_peer *,
 586                                                   gfp_t);
 587extern void rxrpc_put_transport(struct rxrpc_transport *);
 588extern void __exit rxrpc_destroy_all_transports(void);
 589extern struct rxrpc_transport *rxrpc_find_transport(struct rxrpc_local *,
 590                                                    struct rxrpc_peer *);
 591
 592/*
 593 * debug tracing
 594 */
 595extern unsigned int rxrpc_debug;
 596
 597#define dbgprintk(FMT,...) \
 598        printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
 599
 600#define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 601#define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 602#define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
 603#define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
 604#define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
 605
 606
 607#if defined(__KDEBUG)
 608#define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
 609#define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
 610#define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
 611#define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
 612#define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
 613
 614#elif defined(CONFIG_AF_RXRPC_DEBUG)
 615#define RXRPC_DEBUG_KENTER      0x01
 616#define RXRPC_DEBUG_KLEAVE      0x02
 617#define RXRPC_DEBUG_KDEBUG      0x04
 618#define RXRPC_DEBUG_KPROTO      0x08
 619#define RXRPC_DEBUG_KNET        0x10
 620
 621#define _enter(FMT,...)                                 \
 622do {                                                    \
 623        if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
 624                kenter(FMT,##__VA_ARGS__);              \
 625} while (0)
 626
 627#define _leave(FMT,...)                                 \
 628do {                                                    \
 629        if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
 630                kleave(FMT,##__VA_ARGS__);              \
 631} while (0)
 632
 633#define _debug(FMT,...)                                 \
 634do {                                                    \
 635        if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
 636                kdebug(FMT,##__VA_ARGS__);              \
 637} while (0)
 638
 639#define _proto(FMT,...)                                 \
 640do {                                                    \
 641        if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
 642                kproto(FMT,##__VA_ARGS__);              \
 643} while (0)
 644
 645#define _net(FMT,...)                                   \
 646do {                                                    \
 647        if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
 648                knet(FMT,##__VA_ARGS__);                \
 649} while (0)
 650
 651#else
 652#define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 653#define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 654#define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
 655#define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
 656#define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
 657#endif
 658
 659/*
 660 * debug assertion checking
 661 */
 662#if 1 // defined(__KDEBUGALL)
 663
 664#define ASSERT(X)                                               \
 665do {                                                            \
 666        if (unlikely(!(X))) {                                   \
 667                printk(KERN_ERR "\n");                          \
 668                printk(KERN_ERR "RxRPC: Assertion failed\n");   \
 669                BUG();                                          \
 670        }                                                       \
 671} while(0)
 672
 673#define ASSERTCMP(X, OP, Y)                                             \
 674do {                                                                    \
 675        if (unlikely(!((X) OP (Y)))) {                                  \
 676                printk(KERN_ERR "\n");                                  \
 677                printk(KERN_ERR "RxRPC: Assertion failed\n");           \
 678                printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 679                       (unsigned long)(X), (unsigned long)(Y));         \
 680                printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 681                       (unsigned long)(X), (unsigned long)(Y));         \
 682                BUG();                                                  \
 683        }                                                               \
 684} while(0)
 685
 686#define ASSERTIF(C, X)                                          \
 687do {                                                            \
 688        if (unlikely((C) && !(X))) {                            \
 689                printk(KERN_ERR "\n");                          \
 690                printk(KERN_ERR "RxRPC: Assertion failed\n");   \
 691                BUG();                                          \
 692        }                                                       \
 693} while(0)
 694
 695#define ASSERTIFCMP(C, X, OP, Y)                                        \
 696do {                                                                    \
 697        if (unlikely((C) && !((X) OP (Y)))) {                           \
 698                printk(KERN_ERR "\n");                                  \
 699                printk(KERN_ERR "RxRPC: Assertion failed\n");           \
 700                printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 701                       (unsigned long)(X), (unsigned long)(Y));         \
 702                printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 703                       (unsigned long)(X), (unsigned long)(Y));         \
 704                BUG();                                                  \
 705        }                                                               \
 706} while(0)
 707
 708#else
 709
 710#define ASSERT(X)                               \
 711do {                                            \
 712} while(0)
 713
 714#define ASSERTCMP(X, OP, Y)                     \
 715do {                                            \
 716} while(0)
 717
 718#define ASSERTIF(C, X)                          \
 719do {                                            \
 720} while(0)
 721
 722#define ASSERTIFCMP(C, X, OP, Y)                \
 723do {                                            \
 724} while(0)
 725
 726#endif /* __KDEBUGALL */
 727
 728/*
 729 * socket buffer accounting / leak finding
 730 */
 731static inline void __rxrpc_new_skb(struct sk_buff *skb, const char *fn)
 732{
 733        //_net("new skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
 734        //atomic_inc(&rxrpc_n_skbs);
 735}
 736
 737#define rxrpc_new_skb(skb) __rxrpc_new_skb((skb), __func__)
 738
 739static inline void __rxrpc_kill_skb(struct sk_buff *skb, const char *fn)
 740{
 741        //_net("kill skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
 742        //atomic_dec(&rxrpc_n_skbs);
 743}
 744
 745#define rxrpc_kill_skb(skb) __rxrpc_kill_skb((skb), __func__)
 746
 747static inline void __rxrpc_free_skb(struct sk_buff *skb, const char *fn)
 748{
 749        if (skb) {
 750                CHECK_SLAB_OKAY(&skb->users);
 751                //_net("free skb %p %s [%d]",
 752                //     skb, fn, atomic_read(&rxrpc_n_skbs));
 753                //atomic_dec(&rxrpc_n_skbs);
 754                kfree_skb(skb);
 755        }
 756}
 757
 758#define rxrpc_free_skb(skb) __rxrpc_free_skb((skb), __func__)
 759
 760static inline void rxrpc_purge_queue(struct sk_buff_head *list)
 761{
 762        struct sk_buff *skb;
 763        while ((skb = skb_dequeue((list))) != NULL)
 764                rxrpc_free_skb(skb);
 765}
 766
 767static inline void __rxrpc_get_local(struct rxrpc_local *local, const char *f)
 768{
 769        CHECK_SLAB_OKAY(&local->usage);
 770        if (atomic_inc_return(&local->usage) == 1)
 771                printk("resurrected (%s)\n", f);
 772}
 773
 774#define rxrpc_get_local(LOCAL) __rxrpc_get_local((LOCAL), __func__)
 775
 776#define rxrpc_get_call(CALL)                            \
 777do {                                                    \
 778        CHECK_SLAB_OKAY(&(CALL)->usage);                \
 779        if (atomic_inc_return(&(CALL)->usage) == 1)     \
 780                BUG();                                  \
 781} while(0)
 782
 783#define rxrpc_put_call(CALL)                            \
 784do {                                                    \
 785        __rxrpc_put_call(CALL);                         \
 786} while(0)
 787
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