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         u32                     local_abort;    /* local abort code */
 293         u32                     remote_abort;   /* remote abort code */
 294         int                     error;          /* local error incurred */
 295         int                     debug_id;       /* debug ID for printks */
 296         unsigned int            call_counter;   /* call ID counter */
 297         atomic_t                serial;         /* packet serial number counter */
 298         atomic_t                hi_serial;      /* highest serial number received */
 299         u8                      avail_calls;    /* number of calls available */
 300         u8                      size_align;     /* data size alignment (for security) */
 301         u8                      header_size;    /* rxrpc + security header size */
 302         u8                      security_size;  /* security header size */
 303         u32                     security_level; /* security level negotiated */
 304         u32                     security_nonce; /* response re-use preventer */
 305         u32                     epoch;          /* epoch of this connection */
 306         u32                     cid;            /* connection ID */
 307         u16                     service_id;     /* service ID for this connection */
 308         u8                      security_ix;    /* security type */
 309         u8                      in_clientflag;  /* RXRPC_CLIENT_INITIATED if we are server */
 310         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
 311 };
 312
 313 /*
 314  * Flags in call->flags.
 315  */
 316 enum rxrpc_call_flag {
 317         RXRPC_CALL_RELEASED,            /* call has been released - no more message to userspace */
 318         RXRPC_CALL_TERMINAL_MSG,        /* call has given the socket its final message */
 319         RXRPC_CALL_RCVD_LAST,           /* all packets received */
 320         RXRPC_CALL_RUN_RTIMER,          /* Tx resend timer started */
 321         RXRPC_CALL_TX_SOFT_ACK,         /* sent some soft ACKs */
 322         RXRPC_CALL_PROC_BUSY,           /* the processor is busy */
 323         RXRPC_CALL_INIT_ACCEPT,         /* acceptance was initiated */
 324         RXRPC_CALL_HAS_USERID,          /* has a user ID attached */
 325         RXRPC_CALL_EXPECT_OOS,          /* expect out of sequence packets */
 326 };
 327
 328 /*
 329  * Events that can be raised on a call.
 330  */
 331 enum rxrpc_call_event {
 332         RXRPC_CALL_EV_RCVD_ACKALL,      /* ACKALL or reply received */
 333         RXRPC_CALL_EV_RCVD_BUSY,        /* busy packet received */
 334         RXRPC_CALL_EV_RCVD_ABORT,       /* abort packet received */
 335         RXRPC_CALL_EV_RCVD_ERROR,       /* network error received */
 336         RXRPC_CALL_EV_ACK_FINAL,        /* need to generate final ACK (and release call) */
 337         RXRPC_CALL_EV_ACK,              /* need to generate ACK */
 338         RXRPC_CALL_EV_REJECT_BUSY,      /* need to generate busy message */
 339         RXRPC_CALL_EV_ABORT,            /* need to generate abort */
 340         RXRPC_CALL_EV_CONN_ABORT,       /* local connection abort generated */
 341         RXRPC_CALL_EV_RESEND_TIMER,     /* Tx resend timer expired */
 342         RXRPC_CALL_EV_RESEND,           /* Tx resend required */
 343         RXRPC_CALL_EV_DRAIN_RX_OOS,     /* drain the Rx out of sequence queue */
 344         RXRPC_CALL_EV_LIFE_TIMER,       /* call's lifetimer ran out */
 345         RXRPC_CALL_EV_ACCEPTED,         /* incoming call accepted by userspace app */
 346         RXRPC_CALL_EV_SECURED,          /* incoming call's connection is now secure */
 347         RXRPC_CALL_EV_POST_ACCEPT,      /* need to post an "accept?" message to the app */
 348         RXRPC_CALL_EV_RELEASE,          /* need to release the call's resources */
 349 };
 350
 351 /*
 352  * The states that a call can be in.
 353  */
 354 enum rxrpc_call_state {
 355         RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
 356         RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
 357         RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
 358         RXRPC_CALL_CLIENT_FINAL_ACK,    /* - client sending final ACK phase */
 359         RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
 360         RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
 361         RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
 362         RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
 363         RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
 364         RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
 365         RXRPC_CALL_COMPLETE,            /* - call completed */
 366         RXRPC_CALL_SERVER_BUSY,         /* - call rejected by busy server */
 367         RXRPC_CALL_REMOTELY_ABORTED,    /* - call aborted by peer */
 368         RXRPC_CALL_LOCALLY_ABORTED,     /* - call aborted locally on error or close */
 369         RXRPC_CALL_NETWORK_ERROR,       /* - call terminated by network error */
 370         RXRPC_CALL_DEAD,                /* - call is dead */
 371         NR__RXRPC_CALL_STATES
 372 };
 373
 374 /*
 375  * RxRPC call definition
 376  * - matched by { connection, call_id }
 377  */
 378 struct rxrpc_call {
 379         struct rxrpc_connection *conn;          /* connection carrying call */
 380         struct rxrpc_sock       *socket;        /* socket responsible */
 381         struct timer_list       lifetimer;      /* lifetime remaining on call */
 382         struct timer_list       deadspan;       /* reap timer for re-ACK'ing, etc  */
 383         struct timer_list       ack_timer;      /* ACK generation timer */
 384         struct timer_list       resend_timer;   /* Tx resend timer */
 385         struct work_struct      destroyer;      /* call destroyer */
 386         struct work_struct      processor;      /* packet processor and ACK generator */
 387         struct list_head        link;           /* link in master call list */
 388         struct list_head        error_link;     /* link in error distribution list */
 389         struct list_head        accept_link;    /* calls awaiting acceptance */
 390         struct rb_node          sock_node;      /* node in socket call tree */
 391         struct rb_node          conn_node;      /* node in connection call tree */
 392         struct sk_buff_head     rx_queue;       /* received packets */
 393         struct sk_buff_head     rx_oos_queue;   /* packets received out of sequence */
 394         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
 395         wait_queue_head_t       tx_waitq;       /* wait for Tx window space to become available */
 396         unsigned long           user_call_ID;   /* user-defined call ID */
 397         unsigned long           creation_jif;   /* time of call creation */
 398         unsigned long           flags;
 399         unsigned long           events;
 400         spinlock_t              lock;
 401         rwlock_t                state_lock;     /* lock for state transition */
 402         atomic_t                usage;
 403         atomic_t                sequence;       /* Tx data packet sequence counter */
 404         u32                     local_abort;    /* local abort code */
 405         u32                     remote_abort;   /* remote abort code */
 406         int                     error;          /* local error incurred */
 407         enum rxrpc_call_state   state : 8;      /* current state of call */
 408         int                     debug_id;       /* debug ID for printks */
 409         u8                      channel;        /* connection channel occupied by this call */
 410
 411         /* transmission-phase ACK management */
 412         u8                      acks_head;      /* offset into window of first entry */
 413         u8                      acks_tail;      /* offset into window of last entry */
 414         u8                      acks_winsz;     /* size of un-ACK'd window */
 415         u8                      acks_unacked;   /* lowest unacked packet in last ACK received */
 416         int                     acks_latest;    /* serial number of latest ACK received */
 417         rxrpc_seq_t             acks_hard;      /* highest definitively ACK'd msg seq */
 418         unsigned long           *acks_window;   /* sent packet window
 419                                                  * - elements are pointers with LSB set if ACK'd
 420                                                  */
 421
 422         /* receive-phase ACK management */
 423         rxrpc_seq_t             rx_data_expect; /* next data seq ID expected to be received */
 424         rxrpc_seq_t             rx_data_post;   /* next data seq ID expected to be posted */
 425         rxrpc_seq_t             rx_data_recv;   /* last data seq ID encountered by recvmsg */
 426         rxrpc_seq_t             rx_data_eaten;  /* last data seq ID consumed by recvmsg */
 427         rxrpc_seq_t             rx_first_oos;   /* first packet in rx_oos_queue (or 0) */
 428         rxrpc_seq_t             ackr_win_top;   /* top of ACK window (rx_data_eaten is bottom) */
 429         rxrpc_seq_t             ackr_prev_seq;  /* previous sequence number received */
 430         u8                      ackr_reason;    /* reason to ACK */
 431         rxrpc_serial_t          ackr_serial;    /* serial of packet being ACK'd */
 432         atomic_t                ackr_not_idle;  /* number of packets in Rx queue */
 433
 434         /* received packet records, 1 bit per record */
 435 #define RXRPC_ACKR_WINDOW_ASZ DIV_ROUND_UP(RXRPC_MAXACKS, BITS_PER_LONG)
 436         unsigned long           ackr_window[RXRPC_ACKR_WINDOW_ASZ + 1];
 437
 438         struct hlist_node       hash_node;
 439         unsigned long           hash_key;       /* Full hash key */
 440         u8                      in_clientflag;  /* Copy of conn->in_clientflag for hashing */
 441         struct rxrpc_local      *local;         /* Local endpoint. Used for hashing. */
 442         sa_family_t             proto;          /* Frame protocol */
 443         u32                     call_id;        /* call ID on connection  */
 444         u32                     cid;            /* connection ID plus channel index */
 445         u32                     epoch;          /* epoch of this connection */
 446         u16                     service_id;     /* service ID */
 447         union {                                 /* Peer IP address for hashing */
 448                 __be32  ipv4_addr;
 449                 __u8    ipv6_addr[16];          /* Anticipates eventual IPv6 support */
 450         } peer_ip;
 451 };
 452
 453 /*
 454  * locally abort an RxRPC call
 455  */
 456 static inline void rxrpc_abort_call(struct rxrpc_call *call, u32 abort_code)
 457 {
 458         write_lock_bh(&call->state_lock);
 459         if (call->state < RXRPC_CALL_COMPLETE) {
 460                 call->local_abort = abort_code;
 461                 call->state = RXRPC_CALL_LOCALLY_ABORTED;
 462                 set_bit(RXRPC_CALL_EV_ABORT, &call->events);
 463         }
 464         write_unlock_bh(&call->state_lock);
 465 }
 466
 467 /*
 468  * af_rxrpc.c
 469  */
 470 extern atomic_t rxrpc_n_skbs;
 471 extern u32 rxrpc_epoch;
 472 extern atomic_t rxrpc_debug_id;
 473 extern struct workqueue_struct *rxrpc_workqueue;
 474
 475 /*
 476  * ar-accept.c
 477  */
 478 void rxrpc_accept_incoming_calls(struct work_struct *);
 479 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long);
 480 int rxrpc_reject_call(struct rxrpc_sock *);
 481
 482 /*
 483  * ar-ack.c
 484  */
 485 void __rxrpc_propose_ACK(struct rxrpc_call *, u8, u32, bool);
 486 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u32, bool);
 487 void rxrpc_process_call(struct work_struct *);
 488
 489 /*
 490  * ar-call.c
 491  */
 492 extern unsigned int rxrpc_max_call_lifetime;
 493 extern unsigned int rxrpc_dead_call_expiry;
 494 extern struct kmem_cache *rxrpc_call_jar;
 495 extern struct list_head rxrpc_calls;
 496 extern rwlock_t rxrpc_call_lock;
 497
 498 struct rxrpc_call *rxrpc_find_call_hash(struct rxrpc_host_header *,
 499                                         void *, sa_family_t, const void *);
 500 struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *,
 501                                          struct rxrpc_transport *,
 502                                          struct rxrpc_conn_bundle *,
 503                                          unsigned long, int, gfp_t);
 504 struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *,
 505                                        struct rxrpc_connection *,
 506                                        struct rxrpc_host_header *, gfp_t);
 507 struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *, unsigned long);
 508 void rxrpc_release_call(struct rxrpc_call *);
 509 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 510 void __rxrpc_put_call(struct rxrpc_call *);
 511 void __exit rxrpc_destroy_all_calls(void);
 512
 513 /*
 514  * ar-connection.c
 515  */
 516 extern unsigned int rxrpc_connection_expiry;
 517 extern struct list_head rxrpc_connections;
 518 extern rwlock_t rxrpc_connection_lock;
 519
 520 struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *,
 521                                            struct rxrpc_transport *,
 522                                            struct key *, u16, gfp_t);
 523 void rxrpc_put_bundle(struct rxrpc_transport *, struct rxrpc_conn_bundle *);
 524 int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_transport *,
 525                        struct rxrpc_conn_bundle *, struct rxrpc_call *, gfp_t);
 526 void rxrpc_put_connection(struct rxrpc_connection *);
 527 void __exit rxrpc_destroy_all_connections(void);
 528 struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *,
 529                                                struct rxrpc_host_header *);
 530 extern struct rxrpc_connection *
 531 rxrpc_incoming_connection(struct rxrpc_transport *, struct rxrpc_host_header *,
 532                           gfp_t);
 533
 534 /*
 535  * ar-connevent.c
 536  */
 537 void rxrpc_process_connection(struct work_struct *);
 538 void rxrpc_reject_packet(struct rxrpc_local *, struct sk_buff *);
 539 void rxrpc_reject_packets(struct work_struct *);
 540
 541 /*
 542  * ar-error.c
 543  */
 544 void rxrpc_UDP_error_report(struct sock *);
 545 void rxrpc_UDP_error_handler(struct work_struct *);
 546
 547 /*
 548  * ar-input.c
 549  */
 550 void rxrpc_data_ready(struct sock *);
 551 int rxrpc_queue_rcv_skb(struct rxrpc_call *, struct sk_buff *, bool, bool);
 552 void rxrpc_fast_process_packet(struct rxrpc_call *, struct sk_buff *);
 553
 554 /*
 555  * ar-local.c
 556  */
 557 extern rwlock_t rxrpc_local_lock;
 558
 559 struct rxrpc_local *rxrpc_lookup_local(struct sockaddr_rxrpc *);
 560 void rxrpc_put_local(struct rxrpc_local *);
 561 void __exit rxrpc_destroy_all_locals(void);
 562
 563 /*
 564  * ar-key.c
 565  */
 566 extern struct key_type key_type_rxrpc;
 567 extern struct key_type key_type_rxrpc_s;
 568
 569 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
 570 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
 571 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time_t,
 572                               u32);
 573
 574 /*
 575  * ar-output.c
 576  */
 577 extern unsigned int rxrpc_resend_timeout;
 578
 579 int rxrpc_send_packet(struct rxrpc_transport *, struct sk_buff *);
 580 int rxrpc_client_sendmsg(struct rxrpc_sock *, struct rxrpc_transport *,
 581                          struct msghdr *, size_t);
 582 int rxrpc_server_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
 583
 584 /*
 585  * ar-peer.c
 586  */
 587 struct rxrpc_peer *rxrpc_get_peer(struct sockaddr_rxrpc *, gfp_t);
 588 void rxrpc_put_peer(struct rxrpc_peer *);
 589 struct rxrpc_peer *rxrpc_find_peer(struct rxrpc_local *, __be32, __be16);
 590 void __exit rxrpc_destroy_all_peers(void);
 591
 592 /*
 593  * ar-proc.c
 594  */
 595 extern const char *const rxrpc_call_states[];
 596 extern const struct file_operations rxrpc_call_seq_fops;
 597 extern const struct file_operations rxrpc_connection_seq_fops;
 598
 599 /*
 600  * ar-recvmsg.c
 601  */
 602 void rxrpc_remove_user_ID(struct rxrpc_sock *, struct rxrpc_call *);
 603 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
 604
 605 /*
 606  * ar-security.c
 607  */
 608 int rxrpc_register_security(struct rxrpc_security *);
 609 void rxrpc_unregister_security(struct rxrpc_security *);
 610 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
 611 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
 612 int rxrpc_secure_packet(const struct rxrpc_call *, struct sk_buff *, size_t,
 613                         void *);
 614 int rxrpc_verify_packet(const struct rxrpc_call *, struct sk_buff *, u32 *);
 615 void rxrpc_clear_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  * misc.c
 636  */
 637 extern unsigned int rxrpc_requested_ack_delay;
 638 extern unsigned int rxrpc_soft_ack_delay;
 639 extern unsigned int rxrpc_idle_ack_delay;
 640 extern unsigned int rxrpc_rx_window_size;
 641 extern unsigned int rxrpc_rx_mtu;
 642 extern unsigned int rxrpc_rx_jumbo_max;
 643
 644 extern const char *const rxrpc_pkts[];
 645 extern const s8 rxrpc_ack_priority[];
 646
 647 extern const char *rxrpc_acks(u8 reason);
 648
 649 /*
 650  * sysctl.c
 651  */
 652 #ifdef CONFIG_SYSCTL
 653 extern int __init rxrpc_sysctl_init(void);
 654 extern void rxrpc_sysctl_exit(void);
 655 #else
 656 static inline int __init rxrpc_sysctl_init(void) { return 0; }
 657 static inline void rxrpc_sysctl_exit(void) {}
 658 #endif
 659
 660 /*
 661  * debug tracing
 662  */
 663 extern unsigned int rxrpc_debug;
 664
 665 #define dbgprintk(FMT,...) \
 666         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
 667
 668 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 669 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 670 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
 671 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
 672 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
 673
 674
 675 #if defined(__KDEBUG)
 676 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
 677 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
 678 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
 679 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
 680 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
 681
 682 #elif defined(CONFIG_AF_RXRPC_DEBUG)
 683 #define RXRPC_DEBUG_KENTER      0x01
 684 #define RXRPC_DEBUG_KLEAVE      0x02
 685 #define RXRPC_DEBUG_KDEBUG      0x04
 686 #define RXRPC_DEBUG_KPROTO      0x08
 687 #define RXRPC_DEBUG_KNET        0x10
 688
 689 #define _enter(FMT,...)                                 \
 690 do {                                                    \
 691         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
 692                 kenter(FMT,##__VA_ARGS__);              \
 693 } while (0)
 694
 695 #define _leave(FMT,...)                                 \
 696 do {                                                    \
 697         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
 698                 kleave(FMT,##__VA_ARGS__);              \
 699 } while (0)
 700
 701 #define _debug(FMT,...)                                 \
 702 do {                                                    \
 703         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
 704                 kdebug(FMT,##__VA_ARGS__);              \
 705 } while (0)
 706
 707 #define _proto(FMT,...)                                 \
 708 do {                                                    \
 709         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
 710                 kproto(FMT,##__VA_ARGS__);              \
 711 } while (0)
 712
 713 #define _net(FMT,...)                                   \
 714 do {                                                    \
 715         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
 716                 knet(FMT,##__VA_ARGS__);                \
 717 } while (0)
 718
 719 #else
 720 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 721 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 722 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
 723 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
 724 #define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
 725 #endif
 726
 727 /*
 728  * debug assertion checking
 729  */
 730 #if 1 // defined(__KDEBUGALL)
 731
 732 #define ASSERT(X)                                               \
 733 do {                                                            \
 734         if (unlikely(!(X))) {                                   \
 735                 printk(KERN_ERR "\n");                          \
 736                 printk(KERN_ERR "RxRPC: Assertion failed\n");   \
 737                 BUG();                                          \
 738         }                                                       \
 739 } while (0)
 740
 741 #define ASSERTCMP(X, OP, Y)                                             \
 742 do {                                                                    \
 743         if (unlikely(!((X) OP (Y)))) {                                  \
 744                 printk(KERN_ERR "\n");                                  \
 745                 printk(KERN_ERR "RxRPC: Assertion failed\n");           \
 746                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 747                        (unsigned long)(X), (unsigned long)(Y));         \
 748                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 749                        (unsigned long)(X), (unsigned long)(Y));         \
 750                 BUG();                                                  \
 751         }                                                               \
 752 } while (0)
 753
 754 #define ASSERTIF(C, X)                                          \
 755 do {                                                            \
 756         if (unlikely((C) && !(X))) {                            \
 757                 printk(KERN_ERR "\n");                          \
 758                 printk(KERN_ERR "RxRPC: Assertion failed\n");   \
 759                 BUG();                                          \
 760         }                                                       \
 761 } while (0)
 762
 763 #define ASSERTIFCMP(C, X, OP, Y)                                        \
 764 do {                                                                    \
 765         if (unlikely((C) && !((X) OP (Y)))) {                           \
 766                 printk(KERN_ERR "\n");                                  \
 767                 printk(KERN_ERR "RxRPC: Assertion failed\n");           \
 768                 printk(KERN_ERR "%lu " #OP " %lu is false\n",           \
 769                        (unsigned long)(X), (unsigned long)(Y));         \
 770                 printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",       \
 771                        (unsigned long)(X), (unsigned long)(Y));         \
 772                 BUG();                                                  \
 773         }                                                               \
 774 } while (0)
 775
 776 #else
 777
 778 #define ASSERT(X)                               \
 779 do {                                            \
 780 } while (0)
 781
 782 #define ASSERTCMP(X, OP, Y)                     \
 783 do {                                            \
 784 } while (0)
 785
 786 #define ASSERTIF(C, X)                          \
 787 do {                                            \
 788 } while (0)
 789
 790 #define ASSERTIFCMP(C, X, OP, Y)                \
 791 do {                                            \
 792 } while (0)
 793
 794 #endif /* __KDEBUGALL */
 795
 796 /*
 797  * socket buffer accounting / leak finding
 798  */
 799 static inline void __rxrpc_new_skb(struct sk_buff *skb, const char *fn)
 800 {
 801         //_net("new skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
 802         //atomic_inc(&rxrpc_n_skbs);
 803 }
 804
 805 #define rxrpc_new_skb(skb) __rxrpc_new_skb((skb), __func__)
 806
 807 static inline void __rxrpc_kill_skb(struct sk_buff *skb, const char *fn)
 808 {
 809         //_net("kill skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
 810         //atomic_dec(&rxrpc_n_skbs);
 811 }
 812
 813 #define rxrpc_kill_skb(skb) __rxrpc_kill_skb((skb), __func__)
 814
 815 static inline void __rxrpc_free_skb(struct sk_buff *skb, const char *fn)
 816 {
 817         if (skb) {
 818                 CHECK_SLAB_OKAY(&skb->users);
 819                 //_net("free skb %p %s [%d]",
 820                 //     skb, fn, atomic_read(&rxrpc_n_skbs));
 821                 //atomic_dec(&rxrpc_n_skbs);
 822                 kfree_skb(skb);
 823         }
 824 }
 825
 826 #define rxrpc_free_skb(skb) __rxrpc_free_skb((skb), __func__)
 827
 828 static inline void rxrpc_purge_queue(struct sk_buff_head *list)
 829 {
 830         struct sk_buff *skb;
 831         while ((skb = skb_dequeue((list))) != NULL)
 832                 rxrpc_free_skb(skb);
 833 }
 834
 835 static inline void __rxrpc_get_local(struct rxrpc_local *local, const char *f)
 836 {
 837         CHECK_SLAB_OKAY(&local->usage);
 838         if (atomic_inc_return(&local->usage) == 1)
 839                 printk("resurrected (%s)\n", f);
 840 }
 841
 842 #define rxrpc_get_local(LOCAL) __rxrpc_get_local((LOCAL), __func__)
 843
 844 #define rxrpc_get_call(CALL)                            \
 845 do {                                                    \
 846         CHECK_SLAB_OKAY(&(CALL)->usage);                \
 847         if (atomic_inc_return(&(CALL)->usage) == 1)     \
 848                 BUG();                                  \
 849 } while (0)
 850
 851 #define rxrpc_put_call(CALL)                            \
 852 do {                                                    \
 853         __rxrpc_put_call(CALL);                         \
 854 } while (0)