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 <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 extern atomic_t rxrpc_n_skbs;
  23
  24 #define FCRYPT_BSIZE 8
  25 struct rxrpc_crypt {
  26         union {
  27                 u8      x[FCRYPT_BSIZE];
  28                 u32     n[2];
  29         };
  30 } __attribute__((aligned(8)));
  31
  32 extern __be32 rxrpc_epoch;              /* local epoch for detecting local-end reset */
  33 extern atomic_t rxrpc_debug_id;         /* current debugging ID */
  34
  35 /*
  36  * sk_state for RxRPC sockets
  37  */
  38 enum {
  39         RXRPC_UNCONNECTED = 0,
  40         RXRPC_CLIENT_BOUND,             /* client local address bound */
  41         RXRPC_CLIENT_CONNECTED,         /* client is connected */
  42         RXRPC_SERVER_BOUND,             /* server local address bound */
  43         RXRPC_SERVER_LISTENING,         /* server listening for connections */
  44         RXRPC_CLOSE,                    /* socket is being closed */
  45 };
  46
  47 /*
  48  * RxRPC socket definition
  49  */
  50 struct rxrpc_sock {
  51         /* WARNING: sk has to be the first member */
  52         struct sock             sk;
  53         struct rxrpc_local      *local;         /* local endpoint */
  54         struct rxrpc_transport  *trans;         /* transport handler */
  55         struct rxrpc_conn_bundle *bundle;       /* virtual connection bundle */
  56         struct rxrpc_connection *conn;          /* exclusive virtual connection */
  57         struct list_head        listen_link;    /* link in the local endpoint's listen list */
  58         struct list_head        secureq;        /* calls awaiting connection security clearance */
  59         struct list_head        acceptq;        /* calls awaiting acceptance */
  60         struct key              *key;           /* security for this socket */
  61         struct key              *securities;    /* list of server security descriptors */
  62         struct rb_root          calls;          /* outstanding calls on this socket */
  63         unsigned long           flags;
  64 #define RXRPC_SOCK_EXCLUSIVE_CONN       1       /* exclusive connection for a client socket */
  65         rwlock_t                call_lock;      /* lock for calls */
  66         u32                     min_sec_level;  /* minimum security level */
  67 #define RXRPC_SECURITY_MAX      RXRPC_SECURITY_ENCRYPT
  68         struct sockaddr_rxrpc   srx;            /* local address */
  69         sa_family_t             proto;          /* protocol created with */
  70         __be16                  service_id;     /* service ID of local/remote service */
  71 };
  72
  73 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
  74
  75 /*
  76  * RxRPC socket buffer private variables
  77  * - max 48 bytes (struct sk_buff::cb)
  78  */
  79 struct rxrpc_skb_priv {
  80         struct rxrpc_call       *call;          /* call with which associated */
  81         unsigned long           resend_at;      /* time in jiffies at which to resend */
  82         union {
  83                 unsigned        offset;         /* offset into buffer of next read */
  84                 int             remain;         /* amount of space remaining for next write */
  85                 u32             error;          /* network error code */
  86                 bool            need_resend;    /* T if needs resending */
  87         };
  88
  89         struct rxrpc_header     hdr;            /* RxRPC packet header from this packet */
  90 };
  91
  92 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
  93
  94 enum {
  95         RXRPC_SKB_MARK_DATA,            /* data message */
  96         RXRPC_SKB_MARK_FINAL_ACK,       /* final ACK received message */
  97         RXRPC_SKB_MARK_BUSY,            /* server busy message */
  98         RXRPC_SKB_MARK_REMOTE_ABORT,    /* remote abort message */
  99         RXRPC_SKB_MARK_NET_ERROR,       /* network error message */
 100         RXRPC_SKB_MARK_LOCAL_ERROR,     /* local error message */
 101         RXRPC_SKB_MARK_NEW_CALL,        /* local error message */
 102 };
 103
 104 enum rxrpc_command {
 105         RXRPC_CMD_SEND_DATA,            /* send data message */
 106         RXRPC_CMD_SEND_ABORT,           /* request abort generation */
 107         RXRPC_CMD_ACCEPT,               /* [server] accept incoming call */
 108         RXRPC_CMD_REJECT_BUSY,          /* [server] reject a call as busy */
 109 };
 110
 111 /*
 112  * RxRPC security module interface
 113  */
 114 struct rxrpc_security {
 115         struct module           *owner;         /* providing module */
 116         struct list_head        link;           /* link in master list */
 117         const char              *name;          /* name of this service */
 118         u8                      security_index; /* security type provided */
 119
 120         /* initialise a connection's security */
 121         int (*init_connection_security)(struct rxrpc_connection *);
 122
 123         /* prime a connection's packet security */
 124         void (*prime_packet_security)(struct rxrpc_connection *);
 125
 126         /* impose security on a packet */
 127         int (*secure_packet)(const struct rxrpc_call *,
 128                              struct sk_buff *,
 129                              size_t,
 130                              void *);
 131
 132         /* verify the security on a received packet */
 133         int (*verify_packet)(const struct rxrpc_call *, struct sk_buff *,
 134                              u32 *);
 135
 136         /* issue a challenge */
 137         int (*issue_challenge)(struct rxrpc_connection *);
 138
 139         /* respond to a challenge */
 140         int (*respond_to_challenge)(struct rxrpc_connection *,
 141                                     struct sk_buff *,
 142                                     u32 *);
 143
 144         /* verify a response */
 145         int (*verify_response)(struct rxrpc_connection *,
 146                                struct sk_buff *,
 147                                u32 *);
 148
 149         /* clear connection security */
 150         void (*clear)(struct rxrpc_connection *);
 151 };
 152
 153 /*
 154  * RxRPC local transport endpoint definition
 155  * - matched by local port, address and protocol type
 156  */
 157 struct rxrpc_local {
 158         struct socket           *socket;        /* my UDP socket */
 159         struct work_struct      destroyer;      /* endpoint destroyer */
 160         struct work_struct      acceptor;       /* incoming call processor */
 161         struct work_struct      rejecter;       /* packet reject writer */
 162         struct list_head        services;       /* services listening on this endpoint */
 163         struct list_head        link;           /* link in endpoint list */
 164         struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
 165         struct sk_buff_head     accept_queue;   /* incoming calls awaiting acceptance */
 166         struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
 167         spinlock_t              lock;           /* access lock */
 168         rwlock_t                services_lock;  /* lock for services list */
 169         atomic_t                usage;
 170         int                     debug_id;       /* debug ID for printks */
 171         volatile char           error_rcvd;     /* T if received ICMP error outstanding */
 172         struct sockaddr_rxrpc   srx;            /* local address */
 173 };
 174
 175 /*
 176  * RxRPC remote transport endpoint definition
 177  * - matched by remote port, address and protocol type
 178  * - holds the connection ID counter for connections between the two endpoints
 179  */
 180 struct rxrpc_peer {
 181         struct work_struct      destroyer;      /* peer destroyer */
 182         struct list_head        link;           /* link in master peer list */
 183         struct list_head        error_targets;  /* targets for net error distribution */
 184         spinlock_t              lock;           /* access lock */
 185         atomic_t                usage;
 186         unsigned                if_mtu;         /* interface MTU for this peer */
 187         unsigned                mtu;            /* network MTU for this peer */
 188         unsigned                maxdata;        /* data size (MTU - hdrsize) */
 189         unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
 190         int                     debug_id;       /* debug ID for printks */
 191         int                     net_error;      /* network error distributed */
 192         struct sockaddr_rxrpc   srx;            /* remote address */
 193
 194         /* calculated RTT cache */
 195 #define RXRPC_RTT_CACHE_SIZE 32
 196         suseconds_t             rtt;            /* current RTT estimate (in uS) */
 197         unsigned                rtt_point;      /* next entry at which to insert */
 198         unsigned                rtt_usage;      /* amount of cache actually used */
 199         suseconds_t             rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* calculated RTT cache */
 200 };
 201
 202 /*
 203  * RxRPC point-to-point transport / connection manager definition
 204  * - handles a bundle of connections between two endpoints
 205  * - matched by { local, peer }
 206  */
 207 struct rxrpc_transport {
 208         struct rxrpc_local      *local;         /* local transport endpoint */
 209         struct rxrpc_peer       *peer;          /* remote transport endpoint */
 210         struct work_struct      error_handler;  /* network error distributor */
 211         struct rb_root          bundles;        /* client connection bundles on this transport */
 212         struct rb_root          client_conns;   /* client connections on this transport */
 213         struct rb_root          server_conns;   /* server connections on this transport */
 214         struct list_head        link;           /* link in master session list */
 215         struct sk_buff_head     error_queue;    /* error packets awaiting processing */
 216         time_t                  put_time;       /* time at which to reap */
 217         spinlock_t              client_lock;    /* client connection allocation lock */
 218         rwlock_t                conn_lock;      /* lock for active/dead connections */
 219         atomic_t                usage;
 220         int                     debug_id;       /* debug ID for printks */
 221         unsigned int            conn_idcounter; /* connection ID counter (client) */
 222 };
 223
 224 /*
 225  * RxRPC client connection bundle
 226  * - matched by { transport, service_id, key }
 227  */
 228 struct rxrpc_conn_bundle {
 229         struct rb_node          node;           /* node in transport's lookup tree */
 230         struct list_head        unused_conns;   /* unused connections in this bundle */
 231         struct list_head        avail_conns;    /* available connections in this bundle */
 232         struct list_head        busy_conns;     /* busy connections in this bundle */
 233         struct key              *key;           /* security for this bundle */
 234         wait_queue_head_t       chanwait;       /* wait for channel to become available */
 235         atomic_t                usage;
 236         int                     debug_id;       /* debug ID for printks */
 237         unsigned short          num_conns;      /* number of connections in this bundle */
 238         __be16                  service_id;     /* service ID */
 239         uint8_t                 security_ix;    /* security type */
 240 };
 241
 242 /*
 243  * RxRPC connection definition
 244  * - matched by { transport, service_id, conn_id, direction, key }
 245  * - each connection can only handle four simultaneous calls
 246  */
 247 struct rxrpc_connection {
 248         struct rxrpc_transport  *trans;         /* transport session */
 249         struct rxrpc_conn_bundle *bundle;       /* connection bundle (client) */
 250         struct work_struct      processor;      /* connection event processor */
 251         struct rb_node          node;           /* node in transport's lookup tree */
 252         struct list_head        link;           /* link in master connection list */
 253         struct list_head        bundle_link;    /* link in bundle */
 254         struct rb_root          calls;          /* calls on this connection */
 255         struct sk_buff_head     rx_queue;       /* received conn-level packets */
 256         struct rxrpc_call       *channels[RXRPC_MAXCALLS]; /* channels (active calls) */
 257         struct rxrpc_security   *security;      /* applied security module */
 258         struct key              *key;           /* security for this connection (client) */
 259         struct key              *server_key;    /* security for this service */
 260         struct crypto_blkcipher *cipher;        /* encryption handle */
 261         struct rxrpc_crypt      csum_iv;        /* packet checksum base */
 262         unsigned long           events;
 263 #define RXRPC_CONN_CHALLENGE    0               /* send challenge packet */
 264         time_t                  put_time;       /* time at which to reap */
 265         rwlock_t                lock;           /* access lock */
 266         spinlock_t              state_lock;     /* state-change lock */
 267         atomic_t                usage;
 268         u32                     real_conn_id;   /* connection ID (host-endian) */
 269         enum {                                  /* current state of connection */
 270                 RXRPC_CONN_UNUSED,              /* - connection not yet attempted */
 271                 RXRPC_CONN_CLIENT,              /* - client connection */
 272                 RXRPC_CONN_SERVER_UNSECURED,    /* - server unsecured connection */
 273                 RXRPC_CONN_SERVER_CHALLENGING,  /* - server challenging for security */
 274                 RXRPC_CONN_SERVER,              /* - server secured connection */
 275                 RXRPC_CONN_REMOTELY_ABORTED,    /* - conn aborted by peer */
 276                 RXRPC_CONN_LOCALLY_ABORTED,     /* - conn aborted locally */
 277                 RXRPC_CONN_NETWORK_ERROR,       /* - conn terminated by network error */
 278         } state;
 279         int                     error;          /* error code for local abort */
 280         int                     debug_id;       /* debug ID for printks */
 281         unsigned                call_counter;   /* call ID counter */
 282         atomic_t                serial;         /* packet serial number counter */
 283         atomic_t                hi_serial;      /* highest serial number received */
 284         u8                      avail_calls;    /* number of calls available */
 285         u8                      size_align;     /* data size alignment (for security) */
 286         u8                      header_size;    /* rxrpc + security header size */
 287         u8                      security_size;  /* security header size */
 288         u32                     security_level; /* security level negotiated */
 289         u32                     security_nonce; /* response re-use preventer */
 290
 291         /* the following are all in net order */
 292         __be32                  epoch;          /* epoch of this connection */
 293         __be32                  cid;            /* connection ID */
 294         __be16                  service_id;     /* service ID */
 295         u8                      security_ix;    /* security type */
 296         u8                      in_clientflag;  /* RXRPC_CLIENT_INITIATED if we are server */
 297         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
 298 };
 299
 300 /*
 301  * RxRPC call definition
 302  * - matched by { connection, call_id }
 303  */
 304 struct rxrpc_call {
 305         struct rxrpc_connection *conn;          /* connection carrying call */
 306         struct rxrpc_sock       *socket;        /* socket responsible */
 307         struct timer_list       lifetimer;      /* lifetime remaining on call */
 308         struct timer_list       deadspan;       /* reap timer for re-ACK'ing, etc  */
 309         struct timer_list       ack_timer;      /* ACK generation timer */
 310         struct timer_list       resend_timer;   /* Tx resend timer */
 311         struct work_struct      destroyer;      /* call destroyer */
 312         struct work_struct      processor;      /* packet processor and ACK generator */
 313         struct list_head        link;           /* link in master call list */
 314         struct list_head        error_link;     /* link in error distribution list */
 315         struct list_head        accept_link;    /* calls awaiting acceptance */
 316         struct rb_node          sock_node;      /* node in socket call tree */
 317         struct rb_node          conn_node;      /* node in connection call tree */
 318         struct sk_buff_head     rx_queue;       /* received packets */
 319         struct sk_buff_head     rx_oos_queue;   /* packets received out of sequence */
 320         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
 321         wait_queue_head_t       tx_waitq;       /* wait for Tx window space to become available */
 322         unsigned long           user_call_ID;   /* user-defined call ID */
 323         unsigned long           creation_jif;   /* time of call creation */
 324         unsigned long           flags;
 325 #define RXRPC_CALL_RELEASED     0       /* call has been released - no more message to userspace */
 326 #define RXRPC_CALL_TERMINAL_MSG 1       /* call has given the socket its final message */
 327 #define RXRPC_CALL_RCVD_LAST    2       /* all packets received */
 328 #define RXRPC_CALL_RUN_RTIMER   3       /* Tx resend timer started */
 329 #define RXRPC_CALL_TX_SOFT_ACK  4       /* sent some soft ACKs */
 330 #define RXRPC_CALL_PROC_BUSY    5       /* the processor is busy */
 331 #define RXRPC_CALL_INIT_ACCEPT  6       /* acceptance was initiated */
 332 #define RXRPC_CALL_HAS_USERID   7       /* has a user ID attached */
 333 #define RXRPC_CALL_EXPECT_OOS   8       /* expect out of sequence packets */
 334         unsigned long           events;
 335 #define RXRPC_CALL_RCVD_ACKALL  0       /* ACKALL or reply received */
 336 #define RXRPC_CALL_RCVD_BUSY    1       /* busy packet received */
 337 #define RXRPC_CALL_RCVD_ABORT   2       /* abort packet received */
 338 #define RXRPC_CALL_RCVD_ERROR   3       /* network error received */
 339 #define RXRPC_CALL_ACK_FINAL    4       /* need to generate final ACK (and release call) */
 340 #define RXRPC_CALL_ACK          5       /* need to generate ACK */
 341 #define RXRPC_CALL_REJECT_BUSY  6       /* need to generate busy message */
 342 #define RXRPC_CALL_ABORT        7       /* need to generate abort */
 343 #define RXRPC_CALL_CONN_ABORT   8       /* local connection abort generated */
 344 #define RXRPC_CALL_RESEND_TIMER 9       /* Tx resend timer expired */
 345 #define RXRPC_CALL_RESEND       10      /* Tx resend required */
 346 #define RXRPC_CALL_DRAIN_RX_OOS 11      /* drain the Rx out of sequence queue */
 347 #define RXRPC_CALL_LIFE_TIMER   12      /* call's lifetimer ran out */
 348 #define RXRPC_CALL_ACCEPTED     13      /* incoming call accepted by userspace app */
 349 #define RXRPC_CALL_SECURED      14      /* incoming call's connection is now secure */
 350 #define RXRPC_CALL_POST_ACCEPT  15      /* need to post an "accept?" message to the app */
 351 #define RXRPC_CALL_RELEASE      16      /* need to release the call's resources */
 352
 353         spinlock_t              lock;
 354         rwlock_t                state_lock;     /* lock for state transition */
 355         atomic_t                usage;
 356         atomic_t                sequence;       /* Tx data packet sequence counter */
 357         u32                     abort_code;     /* local/remote abort code */
 358         enum {                                  /* current state of call */
 359                 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
 360                 RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
 361                 RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
 362                 RXRPC_CALL_CLIENT_FINAL_ACK,    /* - client sending final ACK phase */
 363                 RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
 364                 RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
 365                 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
 366                 RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
 367                 RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
 368                 RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
 369                 RXRPC_CALL_COMPLETE,            /* - call completed */
 370                 RXRPC_CALL_SERVER_BUSY,         /* - call rejected by busy server */
 371                 RXRPC_CALL_REMOTELY_ABORTED,    /* - call aborted by peer */
 372                 RXRPC_CALL_LOCALLY_ABORTED,     /* - call aborted locally on error or close */
 373                 RXRPC_CALL_NETWORK_ERROR,       /* - call terminated by network error */
 374                 RXRPC_CALL_DEAD,                /* - call is dead */
 375         } state;
 376         int                     debug_id;       /* debug ID for printks */
 377         u8                      channel;        /* connection channel occupied by this call */
 378
 379         /* transmission-phase ACK management */
 380         uint8_t                 acks_head;      /* offset into window of first entry */
 381         uint8_t                 acks_tail;      /* offset into window of last entry */
 382         uint8_t                 acks_winsz;     /* size of un-ACK'd window */
 383         uint8_t                 acks_unacked;   /* lowest unacked packet in last ACK received */
 384         int                     acks_latest;    /* serial number of latest ACK received */
 385         rxrpc_seq_t             acks_hard;      /* highest definitively ACK'd msg seq */
 386         unsigned long           *acks_window;   /* sent packet window
 387                                                  * - elements are pointers with LSB set if ACK'd
 388                                                  */
 389
 390         /* receive-phase ACK management */
 391         rxrpc_seq_t             rx_data_expect; /* next data seq ID expected to be received */
 392         rxrpc_seq_t             rx_data_post;   /* next data seq ID expected to be posted */
 393         rxrpc_seq_t             rx_data_recv;   /* last data seq ID encountered by recvmsg */
 394         rxrpc_seq_t             rx_data_eaten;  /* last data seq ID consumed by recvmsg */
 395         rxrpc_seq_t             rx_first_oos;   /* first packet in rx_oos_queue (or 0) */
 396         rxrpc_seq_t             ackr_win_top;   /* top of ACK window (rx_data_eaten is bottom) */
 397         rxrpc_seq_net_t         ackr_prev_seq;  /* previous sequence number received */
 398         uint8_t                 ackr_reason;    /* reason to ACK */
 399         __be32                  ackr_serial;    /* serial of packet being ACK'd */
 400         atomic_t                ackr_not_idle;  /* number of packets in Rx queue */
 401
 402         /* received packet records, 1 bit per record */
 403 #define RXRPC_ACKR_WINDOW_ASZ DIV_ROUND_UP(RXRPC_MAXACKS, BITS_PER_LONG)
 404         unsigned long           ackr_window[RXRPC_ACKR_WINDOW_ASZ + 1];
 405
 406         /* the following should all be in net order */
 407         __be32                  cid;            /* connection ID + channel index  */
 408         __be32                  call_id;        /* call ID on connection  */
 409 };
 410
 411 /*
 412  * RxRPC key for Kerberos (type-2 security)
 413  */
 414 struct rxkad_key {
 415         u16     security_index;         /* RxRPC header security index */
 416         u16     ticket_len;             /* length of ticket[] */
 417         u32     expiry;                 /* time at which expires */
 418         u32     kvno;                   /* key version number */
 419         u8      session_key[8];         /* DES session key */
 420         u8      ticket[0];              /* the encrypted ticket */
 421 };
 422
 423 struct rxrpc_key_payload {
 424         struct rxkad_key k;
 425 };
 426
 427 /*
 428  * locally abort an RxRPC call
 429  */
 430 static inline void rxrpc_abort_call(struct rxrpc_call *call, u32 abort_code)
 431 {
 432         write_lock_bh(&call->state_lock);
 433         if (call->state < RXRPC_CALL_COMPLETE) {
 434                 call->abort_code = abort_code;
 435                 call->state = RXRPC_CALL_LOCALLY_ABORTED;
 436                 set_bit(RXRPC_CALL_ABORT, &call->events);
 437         }
 438         write_unlock_bh(&call->state_lock);
 439 }
 440
 441 /*
 442  * put a packet up for transport-level abort
 443  */
 444 static inline
 445 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
 446 {
 447         CHECK_SLAB_OKAY(&local->usage);
 448         if (!atomic_inc_not_zero(&local->usage)) {
 449                 printk("resurrected on reject\n");
 450                 BUG();
 451         }
 452         skb_queue_tail(&local->reject_queue, skb);
 453         schedule_work(&local->rejecter);
 454 }
 455
 456 /*
 457  * ar-accept.c
 458  */
 459 extern void rxrpc_accept_incoming_calls(struct work_struct *);
 460 extern int rxrpc_accept_call(struct rxrpc_sock *, unsigned long);
 461
 462 /*
 463  * ar-ack.c
 464  */
 465 extern void __rxrpc_propose_ACK(struct rxrpc_call *, uint8_t, __be32, bool);
 466 extern void rxrpc_propose_ACK(struct rxrpc_call *, uint8_t, __be32, bool);
 467 extern void rxrpc_process_call(struct work_struct *);
 468
 469 /*
 470  * ar-call.c
 471  */
 472 extern struct kmem_cache *rxrpc_call_jar;
 473 extern struct list_head rxrpc_calls;
 474 extern rwlock_t rxrpc_call_lock;
 475
 476 extern struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *,
 477                                                 struct rxrpc_transport *,
 478                                                 struct rxrpc_conn_bundle *,
 479                                                 unsigned long, int, gfp_t);
 480 extern struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *,
 481                                               struct rxrpc_connection *,
 482                                               struct rxrpc_header *, gfp_t);
 483 extern struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *,
 484                                                  unsigned long);
 485 extern void rxrpc_release_call(struct rxrpc_call *);
 486 extern void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 487 extern void __rxrpc_put_call(struct rxrpc_call *);
 488 extern void __exit rxrpc_destroy_all_calls(void);
 489
 490 /*
 491  * ar-connection.c
 492  */
 493 extern struct list_head rxrpc_connections;
 494 extern rwlock_t rxrpc_connection_lock;
 495
 496 extern struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *,
 497                                                   struct rxrpc_transport *,
 498                                                   struct key *,
 499                                                   __be16, gfp_t);
 500 extern void rxrpc_put_bundle(struct rxrpc_transport *,
 501                              struct rxrpc_conn_bundle *);
 502 extern int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_transport *,
 503                               struct rxrpc_conn_bundle *, struct rxrpc_call *,
 504                               gfp_t);
 505 extern void rxrpc_put_connection(struct rxrpc_connection *);
 506 extern void __exit rxrpc_destroy_all_connections(void);
 507 extern struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *,
 508                                                       struct rxrpc_header *);
 509 extern struct rxrpc_connection *
 510 rxrpc_incoming_connection(struct rxrpc_transport *, struct rxrpc_header *,
 511                           gfp_t);
 512
 513 /*
 514  * ar-connevent.c
 515  */
 516 extern void rxrpc_process_connection(struct work_struct *);
 517 extern void rxrpc_reject_packets(struct work_struct *);
 518
 519 /*
 520  * ar-error.c
 521  */
 522 extern void rxrpc_UDP_error_report(struct sock *);
 523 extern void rxrpc_UDP_error_handler(struct work_struct *);
 524
 525 /*
 526  * ar-input.c
 527  */
 528 extern unsigned long rxrpc_ack_timeout;
 529 extern const char *rxrpc_pkts[];
 530
 531 extern void rxrpc_data_ready(struct sock *, int);
 532 extern int rxrpc_queue_rcv_skb(struct rxrpc_call *, struct sk_buff *, bool,
 533                                bool);
 534 extern void rxrpc_fast_process_packet(struct rxrpc_call *, struct sk_buff *);
 535
 536 /*
 537  * ar-local.c
 538  */
 539 extern rwlock_t rxrpc_local_lock;
 540 extern struct rxrpc_local *rxrpc_lookup_local(struct sockaddr_rxrpc *);
 541 extern void rxrpc_put_local(struct rxrpc_local *);
 542 extern void __exit rxrpc_destroy_all_locals(void);
 543
 544 /*
 545  * ar-key.c
 546  */
 547 extern struct key_type key_type_rxrpc;
 548 extern struct key_type key_type_rxrpc_s;
 549
 550 extern int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
 551 extern int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
 552 extern int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *,
 553                                      time_t, u32);
 554
 555 /*
 556  * ar-output.c
 557  */
 558 extern int rxrpc_resend_timeout;
 559
 560 extern int rxrpc_send_packet(struct rxrpc_transport *, struct sk_buff *);
 561 extern int rxrpc_client_sendmsg(struct kiocb *, struct rxrpc_sock *,
 562                                 struct rxrpc_transport *, struct msghdr *,
 563                                 size_t);
 564 extern int rxrpc_server_sendmsg(struct kiocb *, struct rxrpc_sock *,
 565                                 struct msghdr *, size_t);
 566
 567 /*
 568  * ar-peer.c
 569  */
 570 extern struct rxrpc_peer *rxrpc_get_peer(struct sockaddr_rxrpc *, gfp_t);
 571 extern void rxrpc_put_peer(struct rxrpc_peer *);
 572 extern struct rxrpc_peer *rxrpc_find_peer(struct rxrpc_local *,
 573                                           __be32, __be16);
 574 extern void __exit rxrpc_destroy_all_peers(void);
 575
 576 /*
 577  * ar-proc.c
 578  */
 579 extern const char *rxrpc_call_states[];
 580 extern struct file_operations rxrpc_call_seq_fops;
 581 extern struct file_operations rxrpc_connection_seq_fops;
 582
 583 /*
 584  * ar-recvmsg.c
 585  */
 586 extern int rxrpc_recvmsg(struct kiocb *, struct socket *, struct msghdr *,
 587                          size_t, int);
 588
 589 /*
 590  * ar-security.c
 591  */
 592 extern int rxrpc_register_security(struct rxrpc_security *);
 593 extern void rxrpc_unregister_security(struct rxrpc_security *);
 594 extern int rxrpc_init_client_conn_security(struct rxrpc_connection *);
 595 extern int rxrpc_init_server_conn_security(struct rxrpc_connection *);
 596 extern int rxrpc_secure_packet(const struct rxrpc_call *, struct sk_buff *,
 597                                size_t, void *);
 598 extern int rxrpc_verify_packet(const struct rxrpc_call *, struct sk_buff *,
 599                                u32 *);
 600 extern void rxrpc_clear_conn_security(struct rxrpc_connection *);
 601
 602 /*
 603  * ar-skbuff.c
 604  */
 605 extern void rxrpc_packet_destructor(struct sk_buff *);
 606
 607 /*
 608  * ar-transport.c
 609  */
 610 extern struct rxrpc_transport *rxrpc_get_transport(struct rxrpc_local *,
 611                                                    struct rxrpc_peer *,
 612                                                    gfp_t);
 613 extern void rxrpc_put_transport(struct rxrpc_transport *);
 614 extern void __exit rxrpc_destroy_all_transports(void);
 615 extern struct rxrpc_transport *rxrpc_find_transport(struct rxrpc_local *,
 616                                                     struct rxrpc_peer *);
 617
 618 /*
 619  * debug tracing
 620  */
 621 extern unsigned rxrpc_debug;
 622
 623 #define dbgprintk(FMT,...) \
 624         printk("[%x%-6.6s] "FMT"\n", smp_processor_id(), current->comm ,##__VA_ARGS__)
 625
 626 /* make sure we maintain the format strings, even when debugging is disabled */
 627 static inline __attribute__((format(printf,1,2)))
 628 void _dbprintk(const char *fmt, ...)
 629 {
 630 }
 631
 632 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__)
 633 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__)
 634 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
 635 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
 636 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
 637
 638
 639 #if defined(__KDEBUG)
 640 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
 641 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
 642 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
 643 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
 644 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
 645
 646 #elif defined(CONFIG_AF_RXRPC_DEBUG)
 647 #define RXRPC_DEBUG_KENTER      0x01
 648 #define RXRPC_DEBUG_KLEAVE      0x02
 649 #define RXRPC_DEBUG_KDEBUG      0x04
 650 #define RXRPC_DEBUG_KPROTO      0x08
 651 #define RXRPC_DEBUG_KNET        0x10
 652
 653 #define _enter(FMT,...)                                 \
 654 do {                                                    \
 655         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
 656                 kenter(FMT,##__VA_ARGS__);              \
 657 } while (0)
 658
 659 #define _leave(FMT,...)                                 \
 660 do {                                                    \
 661         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
 662                 kleave(FMT,##__VA_ARGS__);              \
 663 } while (0)
 664
 665 #define _debug(FMT,...)                                 \
 666 do {                                                    \
 667         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
 668                 kdebug(FMT,##__VA_ARGS__);              \
 669 } while (0)
 670
 671 #define _proto(FMT,...)                                 \
 672 do {                                                    \
 673         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
 674                 kproto(FMT,##__VA_ARGS__);              \
 675 } while (0)
 676
 677 #define _net(FMT,...)                                   \
 678 do {                                                    \
 679         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
 680                 knet(FMT,##__VA_ARGS__);                \
 681 } while (0)
 682
 683 #else
 684 #define _enter(FMT,...) _dbprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__)
 685 #define _leave(FMT,...) _dbprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__)
 686 #define _debug(FMT,...) _dbprintk("    "FMT ,##__VA_ARGS__)
 687 #define _proto(FMT,...) _dbprintk("### "FMT ,##__VA_ARGS__)
 688 #define _net(FMT,...)   _dbprintk("@@@ "FMT ,##__VA_ARGS__)
 689 #endif
 690
 691 /*
 692  * debug assertion checking
 693  */
 694 #if 1 // defined(__KDEBUGALL)
 695
 696 #define ASSERT(X)                                               \
 697 do {                                                            \
 698         if (unlikely(!(X))) {                                   \
 699                 printk(KERN_ERR "\n");                          \
 700                 printk(KERN_ERR "RxRPC: Assertion failed\n");   \
 701                 BUG();                                          \
 702         }                                                       \
 703 } while(0)
 704
 705 #define ASSERTCMP(X, OP, Y)                                             \
 706 do {                                                                    \
 707         if (unlikely(!((X) OP (Y)))) {                                  \
 708                 printk(KERN_ERR "\n");                                  \
 709                 printk(KERN_ERR "RxRPC: Assertion failed\n");           \
 710                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 711                        (unsigned long)(X), (unsigned long)(Y));         \
 712                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 713                        (unsigned long)(X), (unsigned long)(Y));         \
 714                 BUG();                                                  \
 715         }                                                               \
 716 } while(0)
 717
 718 #define ASSERTIF(C, X)                                          \
 719 do {                                                            \
 720         if (unlikely((C) && !(X))) {                            \
 721                 printk(KERN_ERR "\n");                          \
 722                 printk(KERN_ERR "RxRPC: Assertion failed\n");   \
 723                 BUG();                                          \
 724         }                                                       \
 725 } while(0)
 726
 727 #define ASSERTIFCMP(C, X, OP, Y)                                        \
 728 do {                                                                    \
 729         if (unlikely((C) && !((X) OP (Y)))) {                           \
 730                 printk(KERN_ERR "\n");                                  \
 731                 printk(KERN_ERR "RxRPC: Assertion failed\n");           \
 732                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 733                        (unsigned long)(X), (unsigned long)(Y));         \
 734                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 735                        (unsigned long)(X), (unsigned long)(Y));         \
 736                 BUG();                                                  \
 737         }                                                               \
 738 } while(0)
 739
 740 #else
 741
 742 #define ASSERT(X)                               \
 743 do {                                            \
 744 } while(0)
 745
 746 #define ASSERTCMP(X, OP, Y)                     \
 747 do {                                            \
 748 } while(0)
 749
 750 #define ASSERTIF(C, X)                          \
 751 do {                                            \
 752 } while(0)
 753
 754 #define ASSERTIFCMP(C, X, OP, Y)                \
 755 do {                                            \
 756 } while(0)
 757
 758 #endif /* __KDEBUGALL */
 759
 760 /*
 761  * socket buffer accounting / leak finding
 762  */
 763 static inline void __rxrpc_new_skb(struct sk_buff *skb, const char *fn)
 764 {
 765         //_net("new skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
 766         //atomic_inc(&rxrpc_n_skbs);
 767 }
 768
 769 #define rxrpc_new_skb(skb) __rxrpc_new_skb((skb), __func__)
 770
 771 static inline void __rxrpc_kill_skb(struct sk_buff *skb, const char *fn)
 772 {
 773         //_net("kill skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
 774         //atomic_dec(&rxrpc_n_skbs);
 775 }
 776
 777 #define rxrpc_kill_skb(skb) __rxrpc_kill_skb((skb), __func__)
 778
 779 static inline void __rxrpc_free_skb(struct sk_buff *skb, const char *fn)
 780 {
 781         if (skb) {
 782                 CHECK_SLAB_OKAY(&skb->users);
 783                 //_net("free skb %p %s [%d]",
 784                 //     skb, fn, atomic_read(&rxrpc_n_skbs));
 785                 //atomic_dec(&rxrpc_n_skbs);
 786                 kfree_skb(skb);
 787         }
 788 }
 789
 790 #define rxrpc_free_skb(skb) __rxrpc_free_skb((skb), __func__)
 791
 792 static inline void rxrpc_purge_queue(struct sk_buff_head *list)
 793 {
 794         struct sk_buff *skb;
 795         while ((skb = skb_dequeue((list))) != NULL)
 796                 rxrpc_free_skb(skb);
 797 }
 798
 799 static inline void __rxrpc__atomic_inc(atomic_t *v)
 800 {
 801         CHECK_SLAB_OKAY(v);
 802         atomic_inc(v);
 803 }
 804
 805 #define atomic_inc(v) __rxrpc__atomic_inc((v))
 806
 807 static inline void __rxrpc__atomic_dec(atomic_t *v)
 808 {
 809         CHECK_SLAB_OKAY(v);
 810         atomic_dec(v);
 811 }
 812
 813 #define atomic_dec(v) __rxrpc__atomic_dec((v))
 814
 815 static inline int __rxrpc__atomic_dec_and_test(atomic_t *v)
 816 {
 817         CHECK_SLAB_OKAY(v);
 818         return atomic_dec_and_test(v);
 819 }
 820
 821 #define atomic_dec_and_test(v) __rxrpc__atomic_dec_and_test((v))
 822
 823 static inline void __rxrpc_get_local(struct rxrpc_local *local, const char *f)
 824 {
 825         CHECK_SLAB_OKAY(&local->usage);
 826         if (atomic_inc_return(&local->usage) == 1)
 827                 printk("resurrected (%s)\n", f);
 828 }
 829
 830 #define rxrpc_get_local(LOCAL) __rxrpc_get_local((LOCAL), __func__)
 831
 832 #define rxrpc_get_call(CALL)                            \
 833 do {                                                    \
 834         CHECK_SLAB_OKAY(&(CALL)->usage);                \
 835         if (atomic_inc_return(&(CALL)->usage) == 1)     \
 836                 BUG();                                  \
 837 } while(0)
 838
 839 #define rxrpc_put_call(CALL)                            \
 840 do {                                                    \
 841         __rxrpc_put_call(CALL);                         \
 842 } while(0)