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 #define FCRYPT_BSIZE 8
  23 struct 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  */
  40 enum {
  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  */
  52 struct 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  */
  82 struct 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
  97 enum 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  */
 107 struct 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  */
 150 struct 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 work_struct      event_processor; /* endpoint event processor */
 156         struct list_head        services;       /* services listening on this endpoint */
 157         struct list_head        link;           /* link in endpoint list */
 158         struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
 159         struct sk_buff_head     accept_queue;   /* incoming calls awaiting acceptance */
 160         struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
 161         struct sk_buff_head     event_queue;    /* endpoint event packets awaiting processing */
 162         spinlock_t              lock;           /* access lock */
 163         rwlock_t                services_lock;  /* lock for services list */
 164         atomic_t                usage;
 165         int                     debug_id;       /* debug ID for printks */
 166         volatile char           error_rcvd;     /* T if received ICMP error outstanding */
 167         struct sockaddr_rxrpc   srx;            /* local address */
 168 };
 169
 170 /*
 171  * RxRPC remote transport endpoint definition
 172  * - matched by remote port, address and protocol type
 173  * - holds the connection ID counter for connections between the two endpoints
 174  */
 175 struct rxrpc_peer {
 176         struct work_struct      destroyer;      /* peer destroyer */
 177         struct list_head        link;           /* link in master peer list */
 178         struct list_head        error_targets;  /* targets for net error distribution */
 179         spinlock_t              lock;           /* access lock */
 180         atomic_t                usage;
 181         unsigned int            if_mtu;         /* interface MTU for this peer */
 182         unsigned int            mtu;            /* network MTU for this peer */
 183         unsigned int            maxdata;        /* data size (MTU - hdrsize) */
 184         unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
 185         int                     debug_id;       /* debug ID for printks */
 186         int                     net_error;      /* network error distributed */
 187         struct sockaddr_rxrpc   srx;            /* remote address */
 188
 189         /* calculated RTT cache */
 190 #define RXRPC_RTT_CACHE_SIZE 32
 191         suseconds_t             rtt;            /* current RTT estimate (in uS) */
 192         unsigned int            rtt_point;      /* next entry at which to insert */
 193         unsigned int            rtt_usage;      /* amount of cache actually used */
 194         suseconds_t             rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* calculated RTT cache */
 195 };
 196
 197 /*
 198  * RxRPC point-to-point transport / connection manager definition
 199  * - handles a bundle of connections between two endpoints
 200  * - matched by { local, peer }
 201  */
 202 struct rxrpc_transport {
 203         struct rxrpc_local      *local;         /* local transport endpoint */
 204         struct rxrpc_peer       *peer;          /* remote transport endpoint */
 205         struct work_struct      error_handler;  /* network error distributor */
 206         struct rb_root          bundles;        /* client connection bundles on this transport */
 207         struct rb_root          client_conns;   /* client connections on this transport */
 208         struct rb_root          server_conns;   /* server connections on this transport */
 209         struct list_head        link;           /* link in master session list */
 210         struct sk_buff_head     error_queue;    /* error packets awaiting processing */
 211         unsigned long           put_time;       /* time at which to reap */
 212         spinlock_t              client_lock;    /* client connection allocation lock */
 213         rwlock_t                conn_lock;      /* lock for active/dead connections */
 214         atomic_t                usage;
 215         int                     debug_id;       /* debug ID for printks */
 216         unsigned int            conn_idcounter; /* connection ID counter (client) */
 217 };
 218
 219 /*
 220  * RxRPC client connection bundle
 221  * - matched by { transport, service_id, key }
 222  */
 223 struct rxrpc_conn_bundle {
 224         struct rb_node          node;           /* node in transport's lookup tree */
 225         struct list_head        unused_conns;   /* unused connections in this bundle */
 226         struct list_head        avail_conns;    /* available connections in this bundle */
 227         struct list_head        busy_conns;     /* busy connections in this bundle */
 228         struct key              *key;           /* security for this bundle */
 229         wait_queue_head_t       chanwait;       /* wait for channel to become available */
 230         atomic_t                usage;
 231         int                     debug_id;       /* debug ID for printks */
 232         unsigned short          num_conns;      /* number of connections in this bundle */
 233         __be16                  service_id;     /* service ID */
 234         u8                      security_ix;    /* security type */
 235 };
 236
 237 /*
 238  * RxRPC connection definition
 239  * - matched by { transport, service_id, conn_id, direction, key }
 240  * - each connection can only handle four simultaneous calls
 241  */
 242 struct rxrpc_connection {
 243         struct rxrpc_transport  *trans;         /* transport session */
 244         struct rxrpc_conn_bundle *bundle;       /* connection bundle (client) */
 245         struct work_struct      processor;      /* connection event processor */
 246         struct rb_node          node;           /* node in transport's lookup tree */
 247         struct list_head        link;           /* link in master connection list */
 248         struct list_head        bundle_link;    /* link in bundle */
 249         struct rb_root          calls;          /* calls on this connection */
 250         struct sk_buff_head     rx_queue;       /* received conn-level packets */
 251         struct rxrpc_call       *channels[RXRPC_MAXCALLS]; /* channels (active calls) */
 252         struct rxrpc_security   *security;      /* applied security module */
 253         struct key              *key;           /* security for this connection (client) */
 254         struct key              *server_key;    /* security for this service */
 255         struct crypto_blkcipher *cipher;        /* encryption handle */
 256         struct rxrpc_crypt      csum_iv;        /* packet checksum base */
 257         unsigned long           events;
 258 #define RXRPC_CONN_CHALLENGE    0               /* send challenge packet */
 259         unsigned long           put_time;       /* time at which to reap */
 260         rwlock_t                lock;           /* access lock */
 261         spinlock_t              state_lock;     /* state-change lock */
 262         atomic_t                usage;
 263         u32                     real_conn_id;   /* connection ID (host-endian) */
 264         enum {                                  /* current state of connection */
 265                 RXRPC_CONN_UNUSED,              /* - connection not yet attempted */
 266                 RXRPC_CONN_CLIENT,              /* - client connection */
 267                 RXRPC_CONN_SERVER_UNSECURED,    /* - server unsecured connection */
 268                 RXRPC_CONN_SERVER_CHALLENGING,  /* - server challenging for security */
 269                 RXRPC_CONN_SERVER,              /* - server secured connection */
 270                 RXRPC_CONN_REMOTELY_ABORTED,    /* - conn aborted by peer */
 271                 RXRPC_CONN_LOCALLY_ABORTED,     /* - conn aborted locally */
 272                 RXRPC_CONN_NETWORK_ERROR,       /* - conn terminated by network error */
 273         } state;
 274         int                     error;          /* error code for local abort */
 275         int                     debug_id;       /* debug ID for printks */
 276         unsigned int            call_counter;   /* call ID counter */
 277         atomic_t                serial;         /* packet serial number counter */
 278         atomic_t                hi_serial;      /* highest serial number received */
 279         u8                      avail_calls;    /* number of calls available */
 280         u8                      size_align;     /* data size alignment (for security) */
 281         u8                      header_size;    /* rxrpc + security header size */
 282         u8                      security_size;  /* security header size */
 283         u32                     security_level; /* security level negotiated */
 284         u32                     security_nonce; /* response re-use preventer */
 285
 286         /* the following are all in net order */
 287         __be32                  epoch;          /* epoch of this connection */
 288         __be32                  cid;            /* connection ID */
 289         __be16                  service_id;     /* service ID */
 290         u8                      security_ix;    /* security type */
 291         u8                      in_clientflag;  /* RXRPC_CLIENT_INITIATED if we are server */
 292         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
 293 };
 294
 295 /*
 296  * RxRPC call definition
 297  * - matched by { connection, call_id }
 298  */
 299 struct rxrpc_call {
 300         struct rxrpc_connection *conn;          /* connection carrying call */
 301         struct rxrpc_sock       *socket;        /* socket responsible */
 302         struct timer_list       lifetimer;      /* lifetime remaining on call */
 303         struct timer_list       deadspan;       /* reap timer for re-ACK'ing, etc  */
 304         struct timer_list       ack_timer;      /* ACK generation timer */
 305         struct timer_list       resend_timer;   /* Tx resend timer */
 306         struct work_struct      destroyer;      /* call destroyer */
 307         struct work_struct      processor;      /* packet processor and ACK generator */
 308         struct list_head        link;           /* link in master call list */
 309         struct list_head        error_link;     /* link in error distribution list */
 310         struct list_head        accept_link;    /* calls awaiting acceptance */
 311         struct rb_node          sock_node;      /* node in socket call tree */
 312         struct rb_node          conn_node;      /* node in connection call tree */
 313         struct sk_buff_head     rx_queue;       /* received packets */
 314         struct sk_buff_head     rx_oos_queue;   /* packets received out of sequence */
 315         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
 316         wait_queue_head_t       tx_waitq;       /* wait for Tx window space to become available */
 317         unsigned long           user_call_ID;   /* user-defined call ID */
 318         unsigned long           creation_jif;   /* time of call creation */
 319         unsigned long           flags;
 320 #define RXRPC_CALL_RELEASED     0       /* call has been released - no more message to userspace */
 321 #define RXRPC_CALL_TERMINAL_MSG 1       /* call has given the socket its final message */
 322 #define RXRPC_CALL_RCVD_LAST    2       /* all packets received */
 323 #define RXRPC_CALL_RUN_RTIMER   3       /* Tx resend timer started */
 324 #define RXRPC_CALL_TX_SOFT_ACK  4       /* sent some soft ACKs */
 325 #define RXRPC_CALL_PROC_BUSY    5       /* the processor is busy */
 326 #define RXRPC_CALL_INIT_ACCEPT  6       /* acceptance was initiated */
 327 #define RXRPC_CALL_HAS_USERID   7       /* has a user ID attached */
 328 #define RXRPC_CALL_EXPECT_OOS   8       /* expect out of sequence packets */
 329         unsigned long           events;
 330 #define RXRPC_CALL_RCVD_ACKALL  0       /* ACKALL or reply received */
 331 #define RXRPC_CALL_RCVD_BUSY    1       /* busy packet received */
 332 #define RXRPC_CALL_RCVD_ABORT   2       /* abort packet received */
 333 #define RXRPC_CALL_RCVD_ERROR   3       /* network error received */
 334 #define RXRPC_CALL_ACK_FINAL    4       /* need to generate final ACK (and release call) */
 335 #define RXRPC_CALL_ACK          5       /* need to generate ACK */
 336 #define RXRPC_CALL_REJECT_BUSY  6       /* need to generate busy message */
 337 #define RXRPC_CALL_ABORT        7       /* need to generate abort */
 338 #define RXRPC_CALL_CONN_ABORT   8       /* local connection abort generated */
 339 #define RXRPC_CALL_RESEND_TIMER 9       /* Tx resend timer expired */
 340 #define RXRPC_CALL_RESEND       10      /* Tx resend required */
 341 #define RXRPC_CALL_DRAIN_RX_OOS 11      /* drain the Rx out of sequence queue */
 342 #define RXRPC_CALL_LIFE_TIMER   12      /* call's lifetimer ran out */
 343 #define RXRPC_CALL_ACCEPTED     13      /* incoming call accepted by userspace app */
 344 #define RXRPC_CALL_SECURED      14      /* incoming call's connection is now secure */
 345 #define RXRPC_CALL_POST_ACCEPT  15      /* need to post an "accept?" message to the app */
 346 #define RXRPC_CALL_RELEASE      16      /* need to release the call's resources */
 347
 348         spinlock_t              lock;
 349         rwlock_t                state_lock;     /* lock for state transition */
 350         atomic_t                usage;
 351         atomic_t                sequence;       /* Tx data packet sequence counter */
 352         u32                     abort_code;     /* local/remote abort code */
 353         enum {                                  /* current state of call */
 354                 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
 355                 RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
 356                 RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
 357                 RXRPC_CALL_CLIENT_FINAL_ACK,    /* - client sending final ACK phase */
 358                 RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
 359                 RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
 360                 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
 361                 RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
 362                 RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
 363                 RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
 364                 RXRPC_CALL_COMPLETE,            /* - call completed */
 365                 RXRPC_CALL_SERVER_BUSY,         /* - call rejected by busy server */
 366                 RXRPC_CALL_REMOTELY_ABORTED,    /* - call aborted by peer */
 367                 RXRPC_CALL_LOCALLY_ABORTED,     /* - call aborted locally on error or close */
 368                 RXRPC_CALL_NETWORK_ERROR,       /* - call terminated by network error */
 369                 RXRPC_CALL_DEAD,                /* - call is dead */
 370         } state;
 371         int                     debug_id;       /* debug ID for printks */
 372         u8                      channel;        /* connection channel occupied by this call */
 373
 374         /* transmission-phase ACK management */
 375         u8                      acks_head;      /* offset into window of first entry */
 376         u8                      acks_tail;      /* offset into window of last entry */
 377         u8                      acks_winsz;     /* size of un-ACK'd window */
 378         u8                      acks_unacked;   /* lowest unacked packet in last ACK received */
 379         int                     acks_latest;    /* serial number of latest ACK received */
 380         rxrpc_seq_t             acks_hard;      /* highest definitively ACK'd msg seq */
 381         unsigned long           *acks_window;   /* sent packet window
 382                                                  * - elements are pointers with LSB set if ACK'd
 383                                                  */
 384
 385         /* receive-phase ACK management */
 386         rxrpc_seq_t             rx_data_expect; /* next data seq ID expected to be received */
 387         rxrpc_seq_t             rx_data_post;   /* next data seq ID expected to be posted */
 388         rxrpc_seq_t             rx_data_recv;   /* last data seq ID encountered by recvmsg */
 389         rxrpc_seq_t             rx_data_eaten;  /* last data seq ID consumed by recvmsg */
 390         rxrpc_seq_t             rx_first_oos;   /* first packet in rx_oos_queue (or 0) */
 391         rxrpc_seq_t             ackr_win_top;   /* top of ACK window (rx_data_eaten is bottom) */
 392         rxrpc_seq_net_t         ackr_prev_seq;  /* previous sequence number received */
 393         u8                      ackr_reason;    /* reason to ACK */
 394         __be32                  ackr_serial;    /* serial of packet being ACK'd */
 395         atomic_t                ackr_not_idle;  /* number of packets in Rx queue */
 396
 397         /* received packet records, 1 bit per record */
 398 #define RXRPC_ACKR_WINDOW_ASZ DIV_ROUND_UP(RXRPC_MAXACKS, BITS_PER_LONG)
 399         unsigned long           ackr_window[RXRPC_ACKR_WINDOW_ASZ + 1];
 400
 401         struct hlist_node       hash_node;
 402         unsigned long           hash_key;       /* Full hash key */
 403         u8                      in_clientflag;  /* Copy of conn->in_clientflag for hashing */
 404         struct rxrpc_local      *local;         /* Local endpoint. Used for hashing. */
 405         sa_family_t             proto;          /* Frame protocol */
 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         __be32                  epoch;          /* epoch of this connection */
 410         __be16                  service_id;     /* service ID */
 411         union {                                 /* Peer IP address for hashing */
 412                 __be32  ipv4_addr;
 413                 __u8    ipv6_addr[16];          /* Anticipates eventual IPv6 support */
 414         } peer_ip;
 415 };
 416
 417 /*
 418  * locally abort an RxRPC call
 419  */
 420 static inline void rxrpc_abort_call(struct rxrpc_call *call, u32 abort_code)
 421 {
 422         write_lock_bh(&call->state_lock);
 423         if (call->state < RXRPC_CALL_COMPLETE) {
 424                 call->abort_code = abort_code;
 425                 call->state = RXRPC_CALL_LOCALLY_ABORTED;
 426                 set_bit(RXRPC_CALL_ABORT, &call->events);
 427         }
 428         write_unlock_bh(&call->state_lock);
 429 }
 430
 431 /*
 432  * af_rxrpc.c
 433  */
 434 extern atomic_t rxrpc_n_skbs;
 435 extern __be32 rxrpc_epoch;
 436 extern atomic_t rxrpc_debug_id;
 437 extern struct workqueue_struct *rxrpc_workqueue;
 438
 439 /*
 440  * ar-accept.c
 441  */
 442 void rxrpc_accept_incoming_calls(struct work_struct *);
 443 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long);
 444 int rxrpc_reject_call(struct rxrpc_sock *);
 445
 446 /*
 447  * ar-ack.c
 448  */
 449 extern unsigned rxrpc_requested_ack_delay;
 450 extern unsigned rxrpc_soft_ack_delay;
 451 extern unsigned rxrpc_idle_ack_delay;
 452 extern unsigned rxrpc_rx_window_size;
 453 extern unsigned rxrpc_rx_mtu;
 454 extern unsigned rxrpc_rx_jumbo_max;
 455
 456 void __rxrpc_propose_ACK(struct rxrpc_call *, u8, __be32, bool);
 457 void rxrpc_propose_ACK(struct rxrpc_call *, u8, __be32, bool);
 458 void rxrpc_process_call(struct work_struct *);
 459
 460 /*
 461  * ar-call.c
 462  */
 463 extern unsigned rxrpc_max_call_lifetime;
 464 extern unsigned rxrpc_dead_call_expiry;
 465 extern struct kmem_cache *rxrpc_call_jar;
 466 extern struct list_head rxrpc_calls;
 467 extern rwlock_t rxrpc_call_lock;
 468
 469 struct rxrpc_call *rxrpc_find_call_hash(u8,  __be32, __be32, __be32,
 470                                         __be16, void *, sa_family_t, const u8 *);
 471 struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *,
 472                                          struct rxrpc_transport *,
 473                                          struct rxrpc_conn_bundle *,
 474                                          unsigned long, int, gfp_t);
 475 struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *,
 476                                        struct rxrpc_connection *,
 477                                        struct rxrpc_header *, gfp_t);
 478 struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *, unsigned long);
 479 void rxrpc_release_call(struct rxrpc_call *);
 480 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 481 void __rxrpc_put_call(struct rxrpc_call *);
 482 void __exit rxrpc_destroy_all_calls(void);
 483
 484 /*
 485  * ar-connection.c
 486  */
 487 extern unsigned rxrpc_connection_expiry;
 488 extern struct list_head rxrpc_connections;
 489 extern rwlock_t rxrpc_connection_lock;
 490
 491 struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *,
 492                                            struct rxrpc_transport *,
 493                                            struct key *, __be16, gfp_t);
 494 void rxrpc_put_bundle(struct rxrpc_transport *, struct rxrpc_conn_bundle *);
 495 int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_transport *,
 496                        struct rxrpc_conn_bundle *, struct rxrpc_call *, gfp_t);
 497 void rxrpc_put_connection(struct rxrpc_connection *);
 498 void __exit rxrpc_destroy_all_connections(void);
 499 struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *,
 500                                                struct rxrpc_header *);
 501 extern struct rxrpc_connection *
 502 rxrpc_incoming_connection(struct rxrpc_transport *, struct rxrpc_header *,
 503                           gfp_t);
 504
 505 /*
 506  * ar-connevent.c
 507  */
 508 void rxrpc_process_connection(struct work_struct *);
 509 void rxrpc_reject_packet(struct rxrpc_local *, struct sk_buff *);
 510 void rxrpc_reject_packets(struct work_struct *);
 511
 512 /*
 513  * ar-error.c
 514  */
 515 void rxrpc_UDP_error_report(struct sock *);
 516 void rxrpc_UDP_error_handler(struct work_struct *);
 517
 518 /*
 519  * ar-input.c
 520  */
 521 extern const char *rxrpc_pkts[];
 522
 523 void rxrpc_data_ready(struct sock *);
 524 int rxrpc_queue_rcv_skb(struct rxrpc_call *, struct sk_buff *, bool, bool);
 525 void rxrpc_fast_process_packet(struct rxrpc_call *, struct sk_buff *);
 526
 527 /*
 528  * ar-local.c
 529  */
 530 extern rwlock_t rxrpc_local_lock;
 531
 532 struct rxrpc_local *rxrpc_lookup_local(struct sockaddr_rxrpc *);
 533 void rxrpc_put_local(struct rxrpc_local *);
 534 void __exit rxrpc_destroy_all_locals(void);
 535
 536 /*
 537  * ar-key.c
 538  */
 539 extern struct key_type key_type_rxrpc;
 540 extern struct key_type key_type_rxrpc_s;
 541
 542 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
 543 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
 544 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time_t,
 545                               u32);
 546
 547 /*
 548  * ar-output.c
 549  */
 550 extern unsigned rxrpc_resend_timeout;
 551
 552 int rxrpc_send_packet(struct rxrpc_transport *, struct sk_buff *);
 553 int rxrpc_client_sendmsg(struct rxrpc_sock *, struct rxrpc_transport *,
 554                          struct msghdr *, size_t);
 555 int rxrpc_server_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
 556
 557 /*
 558  * ar-peer.c
 559  */
 560 struct rxrpc_peer *rxrpc_get_peer(struct sockaddr_rxrpc *, gfp_t);
 561 void rxrpc_put_peer(struct rxrpc_peer *);
 562 struct rxrpc_peer *rxrpc_find_peer(struct rxrpc_local *, __be32, __be16);
 563 void __exit rxrpc_destroy_all_peers(void);
 564
 565 /*
 566  * ar-proc.c
 567  */
 568 extern const char *const rxrpc_call_states[];
 569 extern const struct file_operations rxrpc_call_seq_fops;
 570 extern const struct file_operations rxrpc_connection_seq_fops;
 571
 572 /*
 573  * ar-recvmsg.c
 574  */
 575 void rxrpc_remove_user_ID(struct rxrpc_sock *, struct rxrpc_call *);
 576 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
 577
 578 /*
 579  * ar-security.c
 580  */
 581 int rxrpc_register_security(struct rxrpc_security *);
 582 void rxrpc_unregister_security(struct rxrpc_security *);
 583 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
 584 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
 585 int rxrpc_secure_packet(const struct rxrpc_call *, struct sk_buff *, size_t,
 586                         void *);
 587 int rxrpc_verify_packet(const struct rxrpc_call *, struct sk_buff *, u32 *);
 588 void rxrpc_clear_conn_security(struct rxrpc_connection *);
 589
 590 /*
 591  * ar-skbuff.c
 592  */
 593 void rxrpc_packet_destructor(struct sk_buff *);
 594
 595 /*
 596  * ar-transport.c
 597  */
 598 extern unsigned rxrpc_transport_expiry;
 599
 600 struct rxrpc_transport *rxrpc_get_transport(struct rxrpc_local *,
 601                                             struct rxrpc_peer *, gfp_t);
 602 void rxrpc_put_transport(struct rxrpc_transport *);
 603 void __exit rxrpc_destroy_all_transports(void);
 604 struct rxrpc_transport *rxrpc_find_transport(struct rxrpc_local *,
 605                                              struct rxrpc_peer *);
 606
 607 /*
 608  * sysctl.c
 609  */
 610 #ifdef CONFIG_SYSCTL
 611 extern int __init rxrpc_sysctl_init(void);
 612 extern void rxrpc_sysctl_exit(void);
 613 #else
 614 static inline int __init rxrpc_sysctl_init(void) { return 0; }
 615 static inline void rxrpc_sysctl_exit(void) {}
 616 #endif
 617
 618 /*
 619  * debug tracing
 620  */
 621 extern unsigned int rxrpc_debug;
 622
 623 #define dbgprintk(FMT,...) \
 624         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
 625
 626 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 627 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 628 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
 629 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
 630 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
 631
 632
 633 #if defined(__KDEBUG)
 634 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
 635 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
 636 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
 637 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
 638 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
 639
 640 #elif defined(CONFIG_AF_RXRPC_DEBUG)
 641 #define RXRPC_DEBUG_KENTER      0x01
 642 #define RXRPC_DEBUG_KLEAVE      0x02
 643 #define RXRPC_DEBUG_KDEBUG      0x04
 644 #define RXRPC_DEBUG_KPROTO      0x08
 645 #define RXRPC_DEBUG_KNET        0x10
 646
 647 #define _enter(FMT,...)                                 \
 648 do {                                                    \
 649         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
 650                 kenter(FMT,##__VA_ARGS__);              \
 651 } while (0)
 652
 653 #define _leave(FMT,...)                                 \
 654 do {                                                    \
 655         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
 656                 kleave(FMT,##__VA_ARGS__);              \
 657 } while (0)
 658
 659 #define _debug(FMT,...)                                 \
 660 do {                                                    \
 661         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
 662                 kdebug(FMT,##__VA_ARGS__);              \
 663 } while (0)
 664
 665 #define _proto(FMT,...)                                 \
 666 do {                                                    \
 667         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
 668                 kproto(FMT,##__VA_ARGS__);              \
 669 } while (0)
 670
 671 #define _net(FMT,...)                                   \
 672 do {                                                    \
 673         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
 674                 knet(FMT,##__VA_ARGS__);                \
 675 } while (0)
 676
 677 #else
 678 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 679 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 680 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
 681 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
 682 #define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
 683 #endif
 684
 685 /*
 686  * debug assertion checking
 687  */
 688 #if 1 // defined(__KDEBUGALL)
 689
 690 #define ASSERT(X)                                               \
 691 do {                                                            \
 692         if (unlikely(!(X))) {                                   \
 693                 printk(KERN_ERR "\n");                          \
 694                 printk(KERN_ERR "RxRPC: Assertion failed\n");   \
 695                 BUG();                                          \
 696         }                                                       \
 697 } while(0)
 698
 699 #define ASSERTCMP(X, OP, Y)                                             \
 700 do {                                                                    \
 701         if (unlikely(!((X) OP (Y)))) {                                  \
 702                 printk(KERN_ERR "\n");                                  \
 703                 printk(KERN_ERR "RxRPC: Assertion failed\n");           \
 704                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 705                        (unsigned long)(X), (unsigned long)(Y));         \
 706                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 707                        (unsigned long)(X), (unsigned long)(Y));         \
 708                 BUG();                                                  \
 709         }                                                               \
 710 } while(0)
 711
 712 #define ASSERTIF(C, X)                                          \
 713 do {                                                            \
 714         if (unlikely((C) && !(X))) {                            \
 715                 printk(KERN_ERR "\n");                          \
 716                 printk(KERN_ERR "RxRPC: Assertion failed\n");   \
 717                 BUG();                                          \
 718         }                                                       \
 719 } while(0)
 720
 721 #define ASSERTIFCMP(C, X, OP, Y)                                        \
 722 do {                                                                    \
 723         if (unlikely((C) && !((X) OP (Y)))) {                           \
 724                 printk(KERN_ERR "\n");                                  \
 725                 printk(KERN_ERR "RxRPC: Assertion failed\n");           \
 726                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 727                        (unsigned long)(X), (unsigned long)(Y));         \
 728                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 729                        (unsigned long)(X), (unsigned long)(Y));         \
 730                 BUG();                                                  \
 731         }                                                               \
 732 } while(0)
 733
 734 #else
 735
 736 #define ASSERT(X)                               \
 737 do {                                            \
 738 } while(0)
 739
 740 #define ASSERTCMP(X, OP, Y)                     \
 741 do {                                            \
 742 } while(0)
 743
 744 #define ASSERTIF(C, X)                          \
 745 do {                                            \
 746 } while(0)
 747
 748 #define ASSERTIFCMP(C, X, OP, Y)                \
 749 do {                                            \
 750 } while(0)
 751
 752 #endif /* __KDEBUGALL */
 753
 754 /*
 755  * socket buffer accounting / leak finding
 756  */
 757 static inline void __rxrpc_new_skb(struct sk_buff *skb, const char *fn)
 758 {
 759         //_net("new skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
 760         //atomic_inc(&rxrpc_n_skbs);
 761 }
 762
 763 #define rxrpc_new_skb(skb) __rxrpc_new_skb((skb), __func__)
 764
 765 static inline void __rxrpc_kill_skb(struct sk_buff *skb, const char *fn)
 766 {
 767         //_net("kill skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
 768         //atomic_dec(&rxrpc_n_skbs);
 769 }
 770
 771 #define rxrpc_kill_skb(skb) __rxrpc_kill_skb((skb), __func__)
 772
 773 static inline void __rxrpc_free_skb(struct sk_buff *skb, const char *fn)
 774 {
 775         if (skb) {
 776                 CHECK_SLAB_OKAY(&skb->users);
 777                 //_net("free skb %p %s [%d]",
 778                 //     skb, fn, atomic_read(&rxrpc_n_skbs));
 779                 //atomic_dec(&rxrpc_n_skbs);
 780                 kfree_skb(skb);
 781         }
 782 }
 783
 784 #define rxrpc_free_skb(skb) __rxrpc_free_skb((skb), __func__)
 785
 786 static inline void rxrpc_purge_queue(struct sk_buff_head *list)
 787 {
 788         struct sk_buff *skb;
 789         while ((skb = skb_dequeue((list))) != NULL)
 790                 rxrpc_free_skb(skb);
 791 }
 792
 793 static inline void __rxrpc_get_local(struct rxrpc_local *local, const char *f)
 794 {
 795         CHECK_SLAB_OKAY(&local->usage);
 796         if (atomic_inc_return(&local->usage) == 1)
 797                 printk("resurrected (%s)\n", f);
 798 }
 799
 800 #define rxrpc_get_local(LOCAL) __rxrpc_get_local((LOCAL), __func__)
 801
 802 #define rxrpc_get_call(CALL)                            \
 803 do {                                                    \
 804         CHECK_SLAB_OKAY(&(CALL)->usage);                \
 805         if (atomic_inc_return(&(CALL)->usage) == 1)     \
 806                 BUG();                                  \
 807 } while(0)
 808
 809 #define rxrpc_put_call(CALL)                            \
 810 do {                                                    \
 811         __rxrpc_put_call(CALL);                         \
 812 } while(0)