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 <net/sock.h>
  13 #include <rxrpc/packet.h>
  14
  15 #if 0
  16 #define CHECK_SLAB_OKAY(X)                                   \
  17         BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
  18                (POISON_FREE << 8 | POISON_FREE))
  19 #else
  20 #define CHECK_SLAB_OKAY(X) do {} while (0)
  21 #endif
  22
  23 #define FCRYPT_BSIZE 8
  24 struct rxrpc_crypt {
  25         union {
  26                 u8      x[FCRYPT_BSIZE];
  27                 __be32  n[2];
  28         };
  29 } __attribute__((aligned(8)));
  30
  31 #define rxrpc_queue_work(WS)    queue_work(rxrpc_workqueue, (WS))
  32 #define rxrpc_queue_delayed_work(WS,D)  \
  33         queue_delayed_work(rxrpc_workqueue, (WS), (D))
  34
  35 #define rxrpc_queue_call(CALL)  rxrpc_queue_work(&(CALL)->processor)
  36 #define rxrpc_queue_conn(CONN)  rxrpc_queue_work(&(CONN)->processor)
  37
  38 /*
  39  * sk_state for RxRPC sockets
  40  */
  41 enum {
  42         RXRPC_UNCONNECTED = 0,
  43         RXRPC_CLIENT_BOUND,             /* client local address bound */
  44         RXRPC_CLIENT_CONNECTED,         /* client is connected */
  45         RXRPC_SERVER_BOUND,             /* server local address bound */
  46         RXRPC_SERVER_LISTENING,         /* server listening for connections */
  47         RXRPC_CLOSE,                    /* socket is being closed */
  48 };
  49
  50 /*
  51  * RxRPC socket definition
  52  */
  53 struct rxrpc_sock {
  54         /* WARNING: sk has to be the first member */
  55         struct sock             sk;
  56         rxrpc_interceptor_t     interceptor;    /* kernel service Rx interceptor function */
  57         struct rxrpc_local      *local;         /* local endpoint */
  58         struct rxrpc_transport  *trans;         /* transport handler */
  59         struct rxrpc_conn_bundle *bundle;       /* virtual connection bundle */
  60         struct rxrpc_connection *conn;          /* exclusive virtual connection */
  61         struct list_head        listen_link;    /* link in the local endpoint's listen list */
  62         struct list_head        secureq;        /* calls awaiting connection security clearance */
  63         struct list_head        acceptq;        /* calls awaiting acceptance */
  64         struct key              *key;           /* security for this socket */
  65         struct key              *securities;    /* list of server security descriptors */
  66         struct rb_root          calls;          /* outstanding calls on this socket */
  67         unsigned long           flags;
  68 #define RXRPC_SOCK_EXCLUSIVE_CONN       1       /* exclusive connection for a client socket */
  69         rwlock_t                call_lock;      /* lock for calls */
  70         u32                     min_sec_level;  /* minimum security level */
  71 #define RXRPC_SECURITY_MAX      RXRPC_SECURITY_ENCRYPT
  72         struct sockaddr_rxrpc   srx;            /* local address */
  73         sa_family_t             proto;          /* protocol created with */
  74 };
  75
  76 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
  77
  78 /*
  79  * CPU-byteorder normalised Rx packet header.
  80  */
  81 struct rxrpc_host_header {
  82         u32             epoch;          /* client boot timestamp */
  83         u32             cid;            /* connection and channel ID */
  84         u32             callNumber;     /* call ID (0 for connection-level packets) */
  85         u32             seq;            /* sequence number of pkt in call stream */
  86         u32             serial;         /* serial number of pkt sent to network */
  87         u8              type;           /* packet type */
  88         u8              flags;          /* packet flags */
  89         u8              userStatus;     /* app-layer defined status */
  90         u8              securityIndex;  /* security protocol ID */
  91         union {
  92                 u16     _rsvd;          /* reserved */
  93                 u16     cksum;          /* kerberos security checksum */
  94         };
  95         u16             serviceId;      /* service ID */
  96 } __packed;
  97
  98 /*
  99  * RxRPC socket buffer private variables
 100  * - max 48 bytes (struct sk_buff::cb)
 101  */
 102 struct rxrpc_skb_priv {
 103         struct rxrpc_call       *call;          /* call with which associated */
 104         unsigned long           resend_at;      /* time in jiffies at which to resend */
 105         union {
 106                 unsigned int    offset;         /* offset into buffer of next read */
 107                 int             remain;         /* amount of space remaining for next write */
 108                 u32             error;          /* network error code */
 109                 bool            need_resend;    /* T if needs resending */
 110         };
 111
 112         struct rxrpc_host_header hdr;           /* RxRPC packet header from this packet */
 113 };
 114
 115 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
 116
 117 enum rxrpc_command {
 118         RXRPC_CMD_SEND_DATA,            /* send data message */
 119         RXRPC_CMD_SEND_ABORT,           /* request abort generation */
 120         RXRPC_CMD_ACCEPT,               /* [server] accept incoming call */
 121         RXRPC_CMD_REJECT_BUSY,          /* [server] reject a call as busy */
 122 };
 123
 124 /*
 125  * RxRPC security module interface
 126  */
 127 struct rxrpc_security {
 128         const char              *name;          /* name of this service */
 129         u8                      security_index; /* security type provided */
 130
 131         /* Initialise a security service */
 132         int (*init)(void);
 133
 134         /* Clean up a security service */
 135         void (*exit)(void);
 136
 137         /* initialise a connection's security */
 138         int (*init_connection_security)(struct rxrpc_connection *);
 139
 140         /* prime a connection's packet security */
 141         void (*prime_packet_security)(struct rxrpc_connection *);
 142
 143         /* impose security on a packet */
 144         int (*secure_packet)(const struct rxrpc_call *,
 145                              struct sk_buff *,
 146                              size_t,
 147                              void *);
 148
 149         /* verify the security on a received packet */
 150         int (*verify_packet)(const struct rxrpc_call *, struct sk_buff *,
 151                              u32 *);
 152
 153         /* issue a challenge */
 154         int (*issue_challenge)(struct rxrpc_connection *);
 155
 156         /* respond to a challenge */
 157         int (*respond_to_challenge)(struct rxrpc_connection *,
 158                                     struct sk_buff *,
 159                                     u32 *);
 160
 161         /* verify a response */
 162         int (*verify_response)(struct rxrpc_connection *,
 163                                struct sk_buff *,
 164                                u32 *);
 165
 166         /* clear connection security */
 167         void (*clear)(struct rxrpc_connection *);
 168 };
 169
 170 /*
 171  * RxRPC local transport endpoint definition
 172  * - matched by local port, address and protocol type
 173  */
 174 struct rxrpc_local {
 175         struct socket           *socket;        /* my UDP socket */
 176         struct work_struct      destroyer;      /* endpoint destroyer */
 177         struct work_struct      acceptor;       /* incoming call processor */
 178         struct work_struct      rejecter;       /* packet reject writer */
 179         struct work_struct      event_processor; /* endpoint event processor */
 180         struct list_head        services;       /* services listening on this endpoint */
 181         struct list_head        link;           /* link in endpoint list */
 182         struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
 183         struct sk_buff_head     accept_queue;   /* incoming calls awaiting acceptance */
 184         struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
 185         struct sk_buff_head     event_queue;    /* endpoint event packets awaiting processing */
 186         spinlock_t              lock;           /* access lock */
 187         rwlock_t                services_lock;  /* lock for services list */
 188         atomic_t                usage;
 189         int                     debug_id;       /* debug ID for printks */
 190         volatile char           error_rcvd;     /* T if received ICMP error outstanding */
 191         struct sockaddr_rxrpc   srx;            /* local address */
 192 };
 193
 194 /*
 195  * RxRPC remote transport endpoint definition
 196  * - matched by remote port, address and protocol type
 197  * - holds the connection ID counter for connections between the two endpoints
 198  */
 199 struct rxrpc_peer {
 200         struct work_struct      destroyer;      /* peer destroyer */
 201         struct list_head        link;           /* link in master peer list */
 202         struct list_head        error_targets;  /* targets for net error distribution */
 203         spinlock_t              lock;           /* access lock */
 204         atomic_t                usage;
 205         unsigned int            if_mtu;         /* interface MTU for this peer */
 206         unsigned int            mtu;            /* network MTU for this peer */
 207         unsigned int            maxdata;        /* data size (MTU - hdrsize) */
 208         unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
 209         int                     debug_id;       /* debug ID for printks */
 210         int                     net_error;      /* network error distributed */
 211         struct sockaddr_rxrpc   srx;            /* remote address */
 212
 213         /* calculated RTT cache */
 214 #define RXRPC_RTT_CACHE_SIZE 32
 215         suseconds_t             rtt;            /* current RTT estimate (in uS) */
 216         unsigned int            rtt_point;      /* next entry at which to insert */
 217         unsigned int            rtt_usage;      /* amount of cache actually used */
 218         suseconds_t             rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* calculated RTT cache */
 219 };
 220
 221 /*
 222  * RxRPC point-to-point transport / connection manager definition
 223  * - handles a bundle of connections between two endpoints
 224  * - matched by { local, peer }
 225  */
 226 struct rxrpc_transport {
 227         struct rxrpc_local      *local;         /* local transport endpoint */
 228         struct rxrpc_peer       *peer;          /* remote transport endpoint */
 229         struct work_struct      error_handler;  /* network error distributor */
 230         struct rb_root          bundles;        /* client connection bundles on this transport */
 231         struct rb_root          client_conns;   /* client connections on this transport */
 232         struct rb_root          server_conns;   /* server connections on this transport */
 233         struct list_head        link;           /* link in master session list */
 234         struct sk_buff_head     error_queue;    /* error packets awaiting processing */
 235         unsigned long           put_time;       /* time at which to reap */
 236         spinlock_t              client_lock;    /* client connection allocation lock */
 237         rwlock_t                conn_lock;      /* lock for active/dead connections */
 238         atomic_t                usage;
 239         int                     debug_id;       /* debug ID for printks */
 240         unsigned int            conn_idcounter; /* connection ID counter (client) */
 241 };
 242
 243 /*
 244  * RxRPC client connection bundle
 245  * - matched by { transport, service_id, key }
 246  */
 247 struct rxrpc_conn_bundle {
 248         struct rb_node          node;           /* node in transport's lookup tree */
 249         struct list_head        unused_conns;   /* unused connections in this bundle */
 250         struct list_head        avail_conns;    /* available connections in this bundle */
 251         struct list_head        busy_conns;     /* busy connections in this bundle */
 252         struct key              *key;           /* security for this bundle */
 253         wait_queue_head_t       chanwait;       /* wait for channel to become available */
 254         atomic_t                usage;
 255         int                     debug_id;       /* debug ID for printks */
 256         unsigned short          num_conns;      /* number of connections in this bundle */
 257         u16                     service_id;     /* Service ID for this bundle */
 258         u8                      security_ix;    /* security type */
 259 };
 260
 261 /*
 262  * RxRPC connection definition
 263  * - matched by { transport, service_id, conn_id, direction, key }
 264  * - each connection can only handle four simultaneous calls
 265  */
 266 struct rxrpc_connection {
 267         struct rxrpc_transport  *trans;         /* transport session */
 268         struct rxrpc_conn_bundle *bundle;       /* connection bundle (client) */
 269         struct work_struct      processor;      /* connection event processor */
 270         struct rb_node          node;           /* node in transport's lookup tree */
 271         struct list_head        link;           /* link in master connection list */
 272         struct list_head        bundle_link;    /* link in bundle */
 273         struct rb_root          calls;          /* calls on this connection */
 274         struct sk_buff_head     rx_queue;       /* received conn-level packets */
 275         struct rxrpc_call       *channels[RXRPC_MAXCALLS]; /* channels (active calls) */
 276         const struct rxrpc_security *security;  /* applied security module */
 277         struct key              *key;           /* security for this connection (client) */
 278         struct key              *server_key;    /* security for this service */
 279         struct crypto_skcipher  *cipher;        /* encryption handle */
 280         struct rxrpc_crypt      csum_iv;        /* packet checksum base */
 281         unsigned long           events;
 282 #define RXRPC_CONN_CHALLENGE    0               /* send challenge packet */
 283         unsigned long           put_time;       /* time at which to reap */
 284         rwlock_t                lock;           /* access lock */
 285         spinlock_t              state_lock;     /* state-change lock */
 286         atomic_t                usage;
 287         enum {                                  /* current state of connection */
 288                 RXRPC_CONN_UNUSED,              /* - connection not yet attempted */
 289                 RXRPC_CONN_CLIENT,              /* - client connection */
 290                 RXRPC_CONN_SERVER_UNSECURED,    /* - server unsecured connection */
 291                 RXRPC_CONN_SERVER_CHALLENGING,  /* - server challenging for security */
 292                 RXRPC_CONN_SERVER,              /* - server secured connection */
 293                 RXRPC_CONN_REMOTELY_ABORTED,    /* - conn aborted by peer */
 294                 RXRPC_CONN_LOCALLY_ABORTED,     /* - conn aborted locally */
 295                 RXRPC_CONN_NETWORK_ERROR,       /* - conn terminated by network error */
 296         } state;
 297         u32                     local_abort;    /* local abort code */
 298         u32                     remote_abort;   /* remote abort code */
 299         int                     error;          /* local error incurred */
 300         int                     debug_id;       /* debug ID for printks */
 301         unsigned int            call_counter;   /* call ID counter */
 302         atomic_t                serial;         /* packet serial number counter */
 303         atomic_t                hi_serial;      /* highest serial number received */
 304         u8                      avail_calls;    /* number of calls available */
 305         u8                      size_align;     /* data size alignment (for security) */
 306         u8                      header_size;    /* rxrpc + security header size */
 307         u8                      security_size;  /* security header size */
 308         u32                     security_level; /* security level negotiated */
 309         u32                     security_nonce; /* response re-use preventer */
 310         u32                     epoch;          /* epoch of this connection */
 311         u32                     cid;            /* connection ID */
 312         u16                     service_id;     /* service ID for this connection */
 313         u8                      security_ix;    /* security type */
 314         u8                      in_clientflag;  /* RXRPC_CLIENT_INITIATED if we are server */
 315         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
 316 };
 317
 318 /*
 319  * Flags in call->flags.
 320  */
 321 enum rxrpc_call_flag {
 322         RXRPC_CALL_RELEASED,            /* call has been released - no more message to userspace */
 323         RXRPC_CALL_TERMINAL_MSG,        /* call has given the socket its final message */
 324         RXRPC_CALL_RCVD_LAST,           /* all packets received */
 325         RXRPC_CALL_RUN_RTIMER,          /* Tx resend timer started */
 326         RXRPC_CALL_TX_SOFT_ACK,         /* sent some soft ACKs */
 327         RXRPC_CALL_PROC_BUSY,           /* the processor is busy */
 328         RXRPC_CALL_INIT_ACCEPT,         /* acceptance was initiated */
 329         RXRPC_CALL_HAS_USERID,          /* has a user ID attached */
 330         RXRPC_CALL_EXPECT_OOS,          /* expect out of sequence packets */
 331 };
 332
 333 /*
 334  * Events that can be raised on a call.
 335  */
 336 enum rxrpc_call_event {
 337         RXRPC_CALL_EV_RCVD_ACKALL,      /* ACKALL or reply received */
 338         RXRPC_CALL_EV_RCVD_BUSY,        /* busy packet received */
 339         RXRPC_CALL_EV_RCVD_ABORT,       /* abort packet received */
 340         RXRPC_CALL_EV_RCVD_ERROR,       /* network error received */
 341         RXRPC_CALL_EV_ACK_FINAL,        /* need to generate final ACK (and release call) */
 342         RXRPC_CALL_EV_ACK,              /* need to generate ACK */
 343         RXRPC_CALL_EV_REJECT_BUSY,      /* need to generate busy message */
 344         RXRPC_CALL_EV_ABORT,            /* need to generate abort */
 345         RXRPC_CALL_EV_CONN_ABORT,       /* local connection abort generated */
 346         RXRPC_CALL_EV_RESEND_TIMER,     /* Tx resend timer expired */
 347         RXRPC_CALL_EV_RESEND,           /* Tx resend required */
 348         RXRPC_CALL_EV_DRAIN_RX_OOS,     /* drain the Rx out of sequence queue */
 349         RXRPC_CALL_EV_LIFE_TIMER,       /* call's lifetimer ran out */
 350         RXRPC_CALL_EV_ACCEPTED,         /* incoming call accepted by userspace app */
 351         RXRPC_CALL_EV_SECURED,          /* incoming call's connection is now secure */
 352         RXRPC_CALL_EV_POST_ACCEPT,      /* need to post an "accept?" message to the app */
 353         RXRPC_CALL_EV_RELEASE,          /* need to release the call's resources */
 354 };
 355
 356 /*
 357  * The states that a call can be in.
 358  */
 359 enum rxrpc_call_state {
 360         RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
 361         RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
 362         RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
 363         RXRPC_CALL_CLIENT_FINAL_ACK,    /* - client sending final ACK phase */
 364         RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
 365         RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
 366         RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
 367         RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
 368         RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
 369         RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
 370         RXRPC_CALL_COMPLETE,            /* - call completed */
 371         RXRPC_CALL_SERVER_BUSY,         /* - call rejected by busy server */
 372         RXRPC_CALL_REMOTELY_ABORTED,    /* - call aborted by peer */
 373         RXRPC_CALL_LOCALLY_ABORTED,     /* - call aborted locally on error or close */
 374         RXRPC_CALL_NETWORK_ERROR,       /* - call terminated by network error */
 375         RXRPC_CALL_DEAD,                /* - call is dead */
 376         NR__RXRPC_CALL_STATES
 377 };
 378
 379 /*
 380  * RxRPC call definition
 381  * - matched by { connection, call_id }
 382  */
 383 struct rxrpc_call {
 384         struct rxrpc_connection *conn;          /* connection carrying call */
 385         struct rxrpc_sock       *socket;        /* socket responsible */
 386         struct timer_list       lifetimer;      /* lifetime remaining on call */
 387         struct timer_list       deadspan;       /* reap timer for re-ACK'ing, etc  */
 388         struct timer_list       ack_timer;      /* ACK generation timer */
 389         struct timer_list       resend_timer;   /* Tx resend timer */
 390         struct work_struct      destroyer;      /* call destroyer */
 391         struct work_struct      processor;      /* packet processor and ACK generator */
 392         struct list_head        link;           /* link in master call list */
 393         struct list_head        error_link;     /* link in error distribution list */
 394         struct list_head        accept_link;    /* calls awaiting acceptance */
 395         struct rb_node          sock_node;      /* node in socket call tree */
 396         struct rb_node          conn_node;      /* node in connection call tree */
 397         struct sk_buff_head     rx_queue;       /* received packets */
 398         struct sk_buff_head     rx_oos_queue;   /* packets received out of sequence */
 399         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
 400         wait_queue_head_t       tx_waitq;       /* wait for Tx window space to become available */
 401         unsigned long           user_call_ID;   /* user-defined call ID */
 402         unsigned long           creation_jif;   /* time of call creation */
 403         unsigned long           flags;
 404         unsigned long           events;
 405         spinlock_t              lock;
 406         rwlock_t                state_lock;     /* lock for state transition */
 407         atomic_t                usage;
 408         atomic_t                sequence;       /* Tx data packet sequence counter */
 409         u32                     local_abort;    /* local abort code */
 410         u32                     remote_abort;   /* remote abort code */
 411         int                     error;          /* local error incurred */
 412         enum rxrpc_call_state   state : 8;      /* current state of call */
 413         int                     debug_id;       /* debug ID for printks */
 414         u8                      channel;        /* connection channel occupied by this call */
 415
 416         /* transmission-phase ACK management */
 417         u8                      acks_head;      /* offset into window of first entry */
 418         u8                      acks_tail;      /* offset into window of last entry */
 419         u8                      acks_winsz;     /* size of un-ACK'd window */
 420         u8                      acks_unacked;   /* lowest unacked packet in last ACK received */
 421         int                     acks_latest;    /* serial number of latest ACK received */
 422         rxrpc_seq_t             acks_hard;      /* highest definitively ACK'd msg seq */
 423         unsigned long           *acks_window;   /* sent packet window
 424                                                  * - elements are pointers with LSB set if ACK'd
 425                                                  */
 426
 427         /* receive-phase ACK management */
 428         rxrpc_seq_t             rx_data_expect; /* next data seq ID expected to be received */
 429         rxrpc_seq_t             rx_data_post;   /* next data seq ID expected to be posted */
 430         rxrpc_seq_t             rx_data_recv;   /* last data seq ID encountered by recvmsg */
 431         rxrpc_seq_t             rx_data_eaten;  /* last data seq ID consumed by recvmsg */
 432         rxrpc_seq_t             rx_first_oos;   /* first packet in rx_oos_queue (or 0) */
 433         rxrpc_seq_t             ackr_win_top;   /* top of ACK window (rx_data_eaten is bottom) */
 434         rxrpc_seq_t             ackr_prev_seq;  /* previous sequence number received */
 435         u8                      ackr_reason;    /* reason to ACK */
 436         rxrpc_serial_t          ackr_serial;    /* serial of packet being ACK'd */
 437         atomic_t                ackr_not_idle;  /* number of packets in Rx queue */
 438
 439         /* received packet records, 1 bit per record */
 440 #define RXRPC_ACKR_WINDOW_ASZ DIV_ROUND_UP(RXRPC_MAXACKS, BITS_PER_LONG)
 441         unsigned long           ackr_window[RXRPC_ACKR_WINDOW_ASZ + 1];
 442
 443         struct hlist_node       hash_node;
 444         unsigned long           hash_key;       /* Full hash key */
 445         u8                      in_clientflag;  /* Copy of conn->in_clientflag for hashing */
 446         struct rxrpc_local      *local;         /* Local endpoint. Used for hashing. */
 447         sa_family_t             proto;          /* Frame protocol */
 448         u32                     call_id;        /* call ID on connection  */
 449         u32                     cid;            /* connection ID plus channel index */
 450         u32                     epoch;          /* epoch of this connection */
 451         u16                     service_id;     /* service ID */
 452         union {                                 /* Peer IP address for hashing */
 453                 __be32  ipv4_addr;
 454                 __u8    ipv6_addr[16];          /* Anticipates eventual IPv6 support */
 455         } peer_ip;
 456 };
 457
 458 /*
 459  * locally abort an RxRPC call
 460  */
 461 static inline void rxrpc_abort_call(struct rxrpc_call *call, u32 abort_code)
 462 {
 463         write_lock_bh(&call->state_lock);
 464         if (call->state < RXRPC_CALL_COMPLETE) {
 465                 call->local_abort = abort_code;
 466                 call->state = RXRPC_CALL_LOCALLY_ABORTED;
 467                 set_bit(RXRPC_CALL_EV_ABORT, &call->events);
 468         }
 469         write_unlock_bh(&call->state_lock);
 470 }
 471
 472 /*
 473  * af_rxrpc.c
 474  */
 475 extern atomic_t rxrpc_n_skbs;
 476 extern u32 rxrpc_epoch;
 477 extern atomic_t rxrpc_debug_id;
 478 extern struct workqueue_struct *rxrpc_workqueue;
 479
 480 /*
 481  * ar-accept.c
 482  */
 483 void rxrpc_accept_incoming_calls(struct work_struct *);
 484 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long);
 485 int rxrpc_reject_call(struct rxrpc_sock *);
 486
 487 /*
 488  * ar-ack.c
 489  */
 490 void __rxrpc_propose_ACK(struct rxrpc_call *, u8, u32, bool);
 491 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u32, bool);
 492 void rxrpc_process_call(struct work_struct *);
 493
 494 /*
 495  * ar-call.c
 496  */
 497 extern unsigned int rxrpc_max_call_lifetime;
 498 extern unsigned int rxrpc_dead_call_expiry;
 499 extern struct kmem_cache *rxrpc_call_jar;
 500 extern struct list_head rxrpc_calls;
 501 extern rwlock_t rxrpc_call_lock;
 502
 503 struct rxrpc_call *rxrpc_find_call_hash(struct rxrpc_host_header *,
 504                                         void *, sa_family_t, const void *);
 505 struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *,
 506                                          struct rxrpc_transport *,
 507                                          struct rxrpc_conn_bundle *,
 508                                          unsigned long, int, gfp_t);
 509 struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *,
 510                                        struct rxrpc_connection *,
 511                                        struct rxrpc_host_header *);
 512 struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *, unsigned long);
 513 void rxrpc_release_call(struct rxrpc_call *);
 514 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 515 void __rxrpc_put_call(struct rxrpc_call *);
 516 void __exit rxrpc_destroy_all_calls(void);
 517
 518 /*
 519  * ar-connection.c
 520  */
 521 extern unsigned int rxrpc_connection_expiry;
 522 extern struct list_head rxrpc_connections;
 523 extern rwlock_t rxrpc_connection_lock;
 524
 525 struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *,
 526                                            struct rxrpc_transport *,
 527                                            struct key *, u16, gfp_t);
 528 void rxrpc_put_bundle(struct rxrpc_transport *, struct rxrpc_conn_bundle *);
 529 int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_transport *,
 530                        struct rxrpc_conn_bundle *, struct rxrpc_call *, gfp_t);
 531 void rxrpc_put_connection(struct rxrpc_connection *);
 532 void __exit rxrpc_destroy_all_connections(void);
 533 struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *,
 534                                                struct rxrpc_host_header *);
 535 extern struct rxrpc_connection *
 536 rxrpc_incoming_connection(struct rxrpc_transport *, struct rxrpc_host_header *);
 537
 538 /*
 539  * ar-connevent.c
 540  */
 541 void rxrpc_process_connection(struct work_struct *);
 542 void rxrpc_reject_packet(struct rxrpc_local *, struct sk_buff *);
 543 void rxrpc_reject_packets(struct work_struct *);
 544
 545 /*
 546  * ar-error.c
 547  */
 548 void rxrpc_UDP_error_report(struct sock *);
 549 void rxrpc_UDP_error_handler(struct work_struct *);
 550
 551 /*
 552  * ar-input.c
 553  */
 554 void rxrpc_data_ready(struct sock *);
 555 int rxrpc_queue_rcv_skb(struct rxrpc_call *, struct sk_buff *, bool, bool);
 556 void rxrpc_fast_process_packet(struct rxrpc_call *, struct sk_buff *);
 557
 558 /*
 559  * ar-local.c
 560  */
 561 extern rwlock_t rxrpc_local_lock;
 562
 563 struct rxrpc_local *rxrpc_lookup_local(struct sockaddr_rxrpc *);
 564 void rxrpc_put_local(struct rxrpc_local *);
 565 void __exit rxrpc_destroy_all_locals(void);
 566
 567 /*
 568  * ar-key.c
 569  */
 570 extern struct key_type key_type_rxrpc;
 571 extern struct key_type key_type_rxrpc_s;
 572
 573 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
 574 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
 575 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time_t,
 576                               u32);
 577
 578 /*
 579  * ar-output.c
 580  */
 581 extern unsigned int rxrpc_resend_timeout;
 582
 583 int rxrpc_send_packet(struct rxrpc_transport *, struct sk_buff *);
 584 int rxrpc_client_sendmsg(struct rxrpc_sock *, struct rxrpc_transport *,
 585                          struct msghdr *, size_t);
 586 int rxrpc_server_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
 587
 588 /*
 589  * ar-peer.c
 590  */
 591 struct rxrpc_peer *rxrpc_get_peer(struct sockaddr_rxrpc *, gfp_t);
 592 void rxrpc_put_peer(struct rxrpc_peer *);
 593 struct rxrpc_peer *rxrpc_find_peer(struct rxrpc_local *, __be32, __be16);
 594 void __exit rxrpc_destroy_all_peers(void);
 595
 596 /*
 597  * ar-proc.c
 598  */
 599 extern const char *const rxrpc_call_states[];
 600 extern const struct file_operations rxrpc_call_seq_fops;
 601 extern const struct file_operations rxrpc_connection_seq_fops;
 602
 603 /*
 604  * ar-recvmsg.c
 605  */
 606 void rxrpc_remove_user_ID(struct rxrpc_sock *, struct rxrpc_call *);
 607 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
 608
 609 /*
 610  * ar-security.c
 611  */
 612 int __init rxrpc_init_security(void);
 613 void rxrpc_exit_security(void);
 614 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
 615 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
 616
 617 /*
 618  * ar-skbuff.c
 619  */
 620 void rxrpc_packet_destructor(struct sk_buff *);
 621
 622 /*
 623  * ar-transport.c
 624  */
 625 extern unsigned int rxrpc_transport_expiry;
 626
 627 struct rxrpc_transport *rxrpc_get_transport(struct rxrpc_local *,
 628                                             struct rxrpc_peer *, gfp_t);
 629 void rxrpc_put_transport(struct rxrpc_transport *);
 630 void __exit rxrpc_destroy_all_transports(void);
 631 struct rxrpc_transport *rxrpc_find_transport(struct rxrpc_local *,
 632                                              struct rxrpc_peer *);
 633
 634 /*
 635  * insecure.c
 636  */
 637 extern const struct rxrpc_security rxrpc_no_security;
 638
 639 /*
 640  * misc.c
 641  */
 642 extern unsigned int rxrpc_requested_ack_delay;
 643 extern unsigned int rxrpc_soft_ack_delay;
 644 extern unsigned int rxrpc_idle_ack_delay;
 645 extern unsigned int rxrpc_rx_window_size;
 646 extern unsigned int rxrpc_rx_mtu;
 647 extern unsigned int rxrpc_rx_jumbo_max;
 648
 649 extern const char *const rxrpc_pkts[];
 650 extern const s8 rxrpc_ack_priority[];
 651
 652 extern const char *rxrpc_acks(u8 reason);
 653
 654 /*
 655  * rxkad.c
 656  */
 657 #ifdef CONFIG_RXKAD
 658 extern const struct rxrpc_security rxkad;
 659 #endif
 660
 661 /*
 662  * sysctl.c
 663  */
 664 #ifdef CONFIG_SYSCTL
 665 extern int __init rxrpc_sysctl_init(void);
 666 extern void rxrpc_sysctl_exit(void);
 667 #else
 668 static inline int __init rxrpc_sysctl_init(void) { return 0; }
 669 static inline void rxrpc_sysctl_exit(void) {}
 670 #endif
 671
 672 /*
 673  * debug tracing
 674  */
 675 extern unsigned int rxrpc_debug;
 676
 677 #define dbgprintk(FMT,...) \
 678         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
 679
 680 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 681 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 682 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
 683 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
 684 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
 685
 686
 687 #if defined(__KDEBUG)
 688 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
 689 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
 690 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
 691 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
 692 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
 693
 694 #elif defined(CONFIG_AF_RXRPC_DEBUG)
 695 #define RXRPC_DEBUG_KENTER      0x01
 696 #define RXRPC_DEBUG_KLEAVE      0x02
 697 #define RXRPC_DEBUG_KDEBUG      0x04
 698 #define RXRPC_DEBUG_KPROTO      0x08
 699 #define RXRPC_DEBUG_KNET        0x10
 700
 701 #define _enter(FMT,...)                                 \
 702 do {                                                    \
 703         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
 704                 kenter(FMT,##__VA_ARGS__);              \
 705 } while (0)
 706
 707 #define _leave(FMT,...)                                 \
 708 do {                                                    \
 709         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
 710                 kleave(FMT,##__VA_ARGS__);              \
 711 } while (0)
 712
 713 #define _debug(FMT,...)                                 \
 714 do {                                                    \
 715         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
 716                 kdebug(FMT,##__VA_ARGS__);              \
 717 } while (0)
 718
 719 #define _proto(FMT,...)                                 \
 720 do {                                                    \
 721         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
 722                 kproto(FMT,##__VA_ARGS__);              \
 723 } while (0)
 724
 725 #define _net(FMT,...)                                   \
 726 do {                                                    \
 727         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
 728                 knet(FMT,##__VA_ARGS__);                \
 729 } while (0)
 730
 731 #else
 732 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 733 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 734 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
 735 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
 736 #define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
 737 #endif
 738
 739 /*
 740  * debug assertion checking
 741  */
 742 #if 1 // defined(__KDEBUGALL)
 743
 744 #define ASSERT(X)                                               \
 745 do {                                                            \
 746         if (unlikely(!(X))) {                                   \
 747                 printk(KERN_ERR "\n");                          \
 748                 printk(KERN_ERR "RxRPC: Assertion failed\n");   \
 749                 BUG();                                          \
 750         }                                                       \
 751 } while (0)
 752
 753 #define ASSERTCMP(X, OP, Y)                                             \
 754 do {                                                                    \
 755         if (unlikely(!((X) OP (Y)))) {                                  \
 756                 printk(KERN_ERR "\n");                                  \
 757                 printk(KERN_ERR "RxRPC: Assertion failed\n");           \
 758                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 759                        (unsigned long)(X), (unsigned long)(Y));         \
 760                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 761                        (unsigned long)(X), (unsigned long)(Y));         \
 762                 BUG();                                                  \
 763         }                                                               \
 764 } while (0)
 765
 766 #define ASSERTIF(C, X)                                          \
 767 do {                                                            \
 768         if (unlikely((C) && !(X))) {                            \
 769                 printk(KERN_ERR "\n");                          \
 770                 printk(KERN_ERR "RxRPC: Assertion failed\n");   \
 771                 BUG();                                          \
 772         }                                                       \
 773 } while (0)
 774
 775 #define ASSERTIFCMP(C, X, OP, Y)                                        \
 776 do {                                                                    \
 777         if (unlikely((C) && !((X) OP (Y)))) {                           \
 778                 printk(KERN_ERR "\n");                                  \
 779                 printk(KERN_ERR "RxRPC: Assertion failed\n");           \
 780                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 781                        (unsigned long)(X), (unsigned long)(Y));         \
 782                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 783                        (unsigned long)(X), (unsigned long)(Y));         \
 784                 BUG();                                                  \
 785         }                                                               \
 786 } while (0)
 787
 788 #else
 789
 790 #define ASSERT(X)                               \
 791 do {                                            \
 792 } while (0)
 793
 794 #define ASSERTCMP(X, OP, Y)                     \
 795 do {                                            \
 796 } while (0)
 797
 798 #define ASSERTIF(C, X)                          \
 799 do {                                            \
 800 } while (0)
 801
 802 #define ASSERTIFCMP(C, X, OP, Y)                \
 803 do {                                            \
 804 } while (0)
 805
 806 #endif /* __KDEBUGALL */
 807
 808 /*
 809  * socket buffer accounting / leak finding
 810  */
 811 static inline void __rxrpc_new_skb(struct sk_buff *skb, const char *fn)
 812 {
 813         //_net("new skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
 814         //atomic_inc(&rxrpc_n_skbs);
 815 }
 816
 817 #define rxrpc_new_skb(skb) __rxrpc_new_skb((skb), __func__)
 818
 819 static inline void __rxrpc_kill_skb(struct sk_buff *skb, const char *fn)
 820 {
 821         //_net("kill skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
 822         //atomic_dec(&rxrpc_n_skbs);
 823 }
 824
 825 #define rxrpc_kill_skb(skb) __rxrpc_kill_skb((skb), __func__)
 826
 827 static inline void __rxrpc_free_skb(struct sk_buff *skb, const char *fn)
 828 {
 829         if (skb) {
 830                 CHECK_SLAB_OKAY(&skb->users);
 831                 //_net("free skb %p %s [%d]",
 832                 //     skb, fn, atomic_read(&rxrpc_n_skbs));
 833                 //atomic_dec(&rxrpc_n_skbs);
 834                 kfree_skb(skb);
 835         }
 836 }
 837
 838 #define rxrpc_free_skb(skb) __rxrpc_free_skb((skb), __func__)
 839
 840 static inline void rxrpc_purge_queue(struct sk_buff_head *list)
 841 {
 842         struct sk_buff *skb;
 843         while ((skb = skb_dequeue((list))) != NULL)
 844                 rxrpc_free_skb(skb);
 845 }
 846
 847 static inline void __rxrpc_get_local(struct rxrpc_local *local, const char *f)
 848 {
 849         CHECK_SLAB_OKAY(&local->usage);
 850         if (atomic_inc_return(&local->usage) == 1)
 851                 printk("resurrected (%s)\n", f);
 852 }
 853
 854 #define rxrpc_get_local(LOCAL) __rxrpc_get_local((LOCAL), __func__)
 855
 856 #define rxrpc_get_call(CALL)                            \
 857 do {                                                    \
 858         CHECK_SLAB_OKAY(&(CALL)->usage);                \
 859         if (atomic_inc_return(&(CALL)->usage) == 1)     \
 860                 BUG();                                  \
 861 } while (0)
 862
 863 #define rxrpc_put_call(CALL)                            \
 864 do {                                                    \
 865         __rxrpc_put_call(CALL);                         \
 866 } while (0)