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