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 <linux/atomic.h>
  13 #include <linux/seqlock.h>
  14 #include <net/sock.h>
  15 #include <net/af_rxrpc.h>
  16 #include <rxrpc/packet.h>
  17
  18 #if 0
  19 #define CHECK_SLAB_OKAY(X)                                   \
  20         BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
  21                (POISON_FREE << 8 | POISON_FREE))
  22 #else
  23 #define CHECK_SLAB_OKAY(X) do {} while (0)
  24 #endif
  25
  26 #define FCRYPT_BSIZE 8
  27 struct rxrpc_crypt {
  28         union {
  29                 u8      x[FCRYPT_BSIZE];
  30                 __be32  n[2];
  31         };
  32 } __attribute__((aligned(8)));
  33
  34 #define rxrpc_queue_work(WS)    queue_work(rxrpc_workqueue, (WS))
  35 #define rxrpc_queue_delayed_work(WS,D)  \
  36         queue_delayed_work(rxrpc_workqueue, (WS), (D))
  37
  38 #define rxrpc_queue_call(CALL)  rxrpc_queue_work(&(CALL)->processor)
  39
  40 struct rxrpc_connection;
  41
  42 /*
  43  * sk_state for RxRPC sockets
  44  */
  45 enum {
  46         RXRPC_UNBOUND = 0,
  47         RXRPC_CLIENT_UNBOUND,           /* Unbound socket used as client */
  48         RXRPC_CLIENT_BOUND,             /* client local address bound */
  49         RXRPC_SERVER_BOUND,             /* server local address bound */
  50         RXRPC_SERVER_LISTENING,         /* server listening for connections */
  51         RXRPC_CLOSE,                    /* socket is being closed */
  52 };
  53
  54 /*
  55  * RxRPC socket definition
  56  */
  57 struct rxrpc_sock {
  58         /* WARNING: sk has to be the first member */
  59         struct sock             sk;
  60         rxrpc_interceptor_t     interceptor;    /* kernel service Rx interceptor function */
  61         struct rxrpc_local      *local;         /* local endpoint */
  62         struct list_head        listen_link;    /* link in the local endpoint's listen list */
  63         struct list_head        secureq;        /* calls awaiting connection security clearance */
  64         struct list_head        acceptq;        /* calls awaiting acceptance */
  65         struct key              *key;           /* security for this socket */
  66         struct key              *securities;    /* list of server security descriptors */
  67         struct rb_root          calls;          /* outstanding calls on this socket */
  68         unsigned long           flags;
  69 #define RXRPC_SOCK_CONNECTED            0       /* connect_srx is set */
  70         rwlock_t                call_lock;      /* lock for calls */
  71         u32                     min_sec_level;  /* minimum security level */
  72 #define RXRPC_SECURITY_MAX      RXRPC_SECURITY_ENCRYPT
  73         bool                    exclusive;      /* Exclusive connection for a client socket */
  74         sa_family_t             family;         /* Protocol family created with */
  75         struct sockaddr_rxrpc   srx;            /* local address */
  76         struct sockaddr_rxrpc   connect_srx;    /* Default client address from connect() */
  77 };
  78
  79 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
  80
  81 /*
  82  * CPU-byteorder normalised Rx packet header.
  83  */
  84 struct rxrpc_host_header {
  85         u32             epoch;          /* client boot timestamp */
  86         u32             cid;            /* connection and channel ID */
  87         u32             callNumber;     /* call ID (0 for connection-level packets) */
  88         u32             seq;            /* sequence number of pkt in call stream */
  89         u32             serial;         /* serial number of pkt sent to network */
  90         u8              type;           /* packet type */
  91         u8              flags;          /* packet flags */
  92         u8              userStatus;     /* app-layer defined status */
  93         u8              securityIndex;  /* security protocol ID */
  94         union {
  95                 u16     _rsvd;          /* reserved */
  96                 u16     cksum;          /* kerberos security checksum */
  97         };
  98         u16             serviceId;      /* service ID */
  99 } __packed;
 100
 101 /*
 102  * RxRPC socket buffer private variables
 103  * - max 48 bytes (struct sk_buff::cb)
 104  */
 105 struct rxrpc_skb_priv {
 106         struct rxrpc_call       *call;          /* call with which associated */
 107         unsigned long           resend_at;      /* time in jiffies at which to resend */
 108         union {
 109                 unsigned int    offset;         /* offset into buffer of next read */
 110                 int             remain;         /* amount of space remaining for next write */
 111                 u32             error;          /* network error code */
 112                 bool            need_resend;    /* T if needs resending */
 113         };
 114
 115         struct rxrpc_host_header hdr;           /* RxRPC packet header from this packet */
 116 };
 117
 118 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
 119
 120 enum rxrpc_command {
 121         RXRPC_CMD_SEND_DATA,            /* send data message */
 122         RXRPC_CMD_SEND_ABORT,           /* request abort generation */
 123         RXRPC_CMD_ACCEPT,               /* [server] accept incoming call */
 124         RXRPC_CMD_REJECT_BUSY,          /* [server] reject a call as busy */
 125 };
 126
 127 /*
 128  * RxRPC security module interface
 129  */
 130 struct rxrpc_security {
 131         const char              *name;          /* name of this service */
 132         u8                      security_index; /* security type provided */
 133
 134         /* Initialise a security service */
 135         int (*init)(void);
 136
 137         /* Clean up a security service */
 138         void (*exit)(void);
 139
 140         /* initialise a connection's security */
 141         int (*init_connection_security)(struct rxrpc_connection *);
 142
 143         /* prime a connection's packet security */
 144         int (*prime_packet_security)(struct rxrpc_connection *);
 145
 146         /* impose security on a packet */
 147         int (*secure_packet)(struct rxrpc_call *,
 148                              struct sk_buff *,
 149                              size_t,
 150                              void *);
 151
 152         /* verify the security on a received packet */
 153         int (*verify_packet)(struct rxrpc_call *, struct sk_buff *, u32 *);
 154
 155         /* issue a challenge */
 156         int (*issue_challenge)(struct rxrpc_connection *);
 157
 158         /* respond to a challenge */
 159         int (*respond_to_challenge)(struct rxrpc_connection *,
 160                                     struct sk_buff *,
 161                                     u32 *);
 162
 163         /* verify a response */
 164         int (*verify_response)(struct rxrpc_connection *,
 165                                struct sk_buff *,
 166                                u32 *);
 167
 168         /* clear connection security */
 169         void (*clear)(struct rxrpc_connection *);
 170 };
 171
 172 /*
 173  * RxRPC local transport endpoint description
 174  * - owned by a single AF_RXRPC socket
 175  * - pointed to by transport socket struct sk_user_data
 176  */
 177 struct rxrpc_local {
 178         struct rcu_head         rcu;
 179         atomic_t                usage;
 180         struct list_head        link;
 181         struct socket           *socket;        /* my UDP socket */
 182         struct work_struct      processor;
 183         struct list_head        services;       /* services listening on this endpoint */
 184         struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
 185         struct sk_buff_head     accept_queue;   /* incoming calls awaiting acceptance */
 186         struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
 187         struct sk_buff_head     event_queue;    /* endpoint event packets awaiting processing */
 188         struct rb_root          client_conns;   /* Client connections by socket params */
 189         spinlock_t              client_conns_lock; /* Lock for client_conns */
 190         spinlock_t              lock;           /* access lock */
 191         rwlock_t                services_lock;  /* lock for services list */
 192         int                     debug_id;       /* debug ID for printks */
 193         bool                    dead;
 194         struct sockaddr_rxrpc   srx;            /* local address */
 195 };
 196
 197 /*
 198  * RxRPC remote transport endpoint definition
 199  * - matched by local endpoint, remote port, address and protocol type
 200  */
 201 struct rxrpc_peer {
 202         struct rcu_head         rcu;            /* This must be first */
 203         atomic_t                usage;
 204         unsigned long           hash_key;
 205         struct hlist_node       hash_link;
 206         struct rxrpc_local      *local;
 207         struct hlist_head       error_targets;  /* targets for net error distribution */
 208         struct work_struct      error_distributor;
 209         struct rb_root          service_conns;  /* Service connections */
 210         seqlock_t               service_conn_lock;
 211         spinlock_t              lock;           /* access lock */
 212         unsigned int            if_mtu;         /* interface MTU for this peer */
 213         unsigned int            mtu;            /* network MTU for this peer */
 214         unsigned int            maxdata;        /* data size (MTU - hdrsize) */
 215         unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
 216         int                     debug_id;       /* debug ID for printks */
 217         int                     error_report;   /* Net (+0) or local (+1000000) to distribute */
 218 #define RXRPC_LOCAL_ERROR_OFFSET 1000000
 219         struct sockaddr_rxrpc   srx;            /* remote address */
 220
 221         /* calculated RTT cache */
 222 #define RXRPC_RTT_CACHE_SIZE 32
 223         suseconds_t             rtt;            /* current RTT estimate (in uS) */
 224         unsigned int            rtt_point;      /* next entry at which to insert */
 225         unsigned int            rtt_usage;      /* amount of cache actually used */
 226         suseconds_t             rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* calculated RTT cache */
 227 };
 228
 229 /*
 230  * Keys for matching a connection.
 231  */
 232 struct rxrpc_conn_proto {
 233         union {
 234                 struct {
 235                         u32     epoch;          /* epoch of this connection */
 236                         u32     cid;            /* connection ID */
 237                 };
 238                 u64             index_key;
 239         };
 240 };
 241
 242 struct rxrpc_conn_parameters {
 243         struct rxrpc_local      *local;         /* Representation of local endpoint */
 244         struct rxrpc_peer       *peer;          /* Remote endpoint */
 245         struct key              *key;           /* Security details */
 246         bool                    exclusive;      /* T if conn is exclusive */
 247         u16                     service_id;     /* Service ID for this connection */
 248         u32                     security_level; /* Security level selected */
 249 };
 250
 251 /*
 252  * Bits in the connection flags.
 253  */
 254 enum rxrpc_conn_flag {
 255         RXRPC_CONN_HAS_IDR,             /* Has a client conn ID assigned */
 256         RXRPC_CONN_IN_SERVICE_CONNS,    /* Conn is in peer->service_conns */
 257         RXRPC_CONN_IN_CLIENT_CONNS,     /* Conn is in local->client_conns */
 258 };
 259
 260 /*
 261  * Events that can be raised upon a connection.
 262  */
 263 enum rxrpc_conn_event {
 264         RXRPC_CONN_EV_CHALLENGE,        /* Send challenge packet */
 265 };
 266
 267 /*
 268  * The connection protocol state.
 269  */
 270 enum rxrpc_conn_proto_state {
 271         RXRPC_CONN_UNUSED,              /* Connection not yet attempted */
 272         RXRPC_CONN_CLIENT,              /* Client connection */
 273         RXRPC_CONN_SERVICE_UNSECURED,   /* Service unsecured connection */
 274         RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
 275         RXRPC_CONN_SERVICE,             /* Service secured connection */
 276         RXRPC_CONN_REMOTELY_ABORTED,    /* Conn aborted by peer */
 277         RXRPC_CONN_LOCALLY_ABORTED,     /* Conn aborted locally */
 278         RXRPC_CONN_NETWORK_ERROR,       /* Conn terminated by network error */
 279         RXRPC_CONN__NR_STATES
 280 };
 281
 282 /*
 283  * RxRPC connection definition
 284  * - matched by { local, peer, epoch, conn_id, direction }
 285  * - each connection can only handle four simultaneous calls
 286  */
 287 struct rxrpc_connection {
 288         struct rxrpc_conn_proto proto;
 289         struct rxrpc_conn_parameters params;
 290
 291         spinlock_t              channel_lock;
 292
 293         struct rxrpc_channel {
 294                 struct rxrpc_call __rcu *call;          /* Active call */
 295                 u32                     call_id;        /* ID of current call */
 296                 u32                     call_counter;   /* Call ID counter */
 297                 u32                     last_call;      /* ID of last call */
 298                 u32                     last_result;    /* Result of last call (0/abort) */
 299         } channels[RXRPC_MAXCALLS];
 300         wait_queue_head_t       channel_wq;     /* queue to wait for channel to become available */
 301
 302         struct rcu_head         rcu;
 303         struct work_struct      processor;      /* connection event processor */
 304         union {
 305                 struct rb_node  client_node;    /* Node in local->client_conns */
 306                 struct rb_node  service_node;   /* Node in peer->service_conns */
 307         };
 308         struct list_head        link;           /* link in master connection list */
 309         struct sk_buff_head     rx_queue;       /* received conn-level packets */
 310         const struct rxrpc_security *security;  /* applied security module */
 311         struct key              *server_key;    /* security for this service */
 312         struct crypto_skcipher  *cipher;        /* encryption handle */
 313         struct rxrpc_crypt      csum_iv;        /* packet checksum base */
 314         unsigned long           flags;
 315         unsigned long           events;
 316         unsigned long           put_time;       /* Time at which last put */
 317         spinlock_t              state_lock;     /* state-change lock */
 318         atomic_t                usage;
 319         enum rxrpc_conn_proto_state state : 8;  /* current state of connection */
 320         u32                     local_abort;    /* local abort code */
 321         u32                     remote_abort;   /* remote abort code */
 322         int                     error;          /* local error incurred */
 323         int                     debug_id;       /* debug ID for printks */
 324         atomic_t                serial;         /* packet serial number counter */
 325         atomic_t                hi_serial;      /* highest serial number received */
 326         atomic_t                avail_chans;    /* number of channels available */
 327         u8                      size_align;     /* data size alignment (for security) */
 328         u8                      header_size;    /* rxrpc + security header size */
 329         u8                      security_size;  /* security header size */
 330         u32                     security_nonce; /* response re-use preventer */
 331         u8                      security_ix;    /* security type */
 332         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
 333 };
 334
 335 /*
 336  * Flags in call->flags.
 337  */
 338 enum rxrpc_call_flag {
 339         RXRPC_CALL_RELEASED,            /* call has been released - no more message to userspace */
 340         RXRPC_CALL_TERMINAL_MSG,        /* call has given the socket its final message */
 341         RXRPC_CALL_RCVD_LAST,           /* all packets received */
 342         RXRPC_CALL_RUN_RTIMER,          /* Tx resend timer started */
 343         RXRPC_CALL_TX_SOFT_ACK,         /* sent some soft ACKs */
 344         RXRPC_CALL_PROC_BUSY,           /* the processor is busy */
 345         RXRPC_CALL_INIT_ACCEPT,         /* acceptance was initiated */
 346         RXRPC_CALL_HAS_USERID,          /* has a user ID attached */
 347         RXRPC_CALL_EXPECT_OOS,          /* expect out of sequence packets */
 348 };
 349
 350 /*
 351  * Events that can be raised on a call.
 352  */
 353 enum rxrpc_call_event {
 354         RXRPC_CALL_EV_RCVD_ACKALL,      /* ACKALL or reply received */
 355         RXRPC_CALL_EV_RCVD_BUSY,        /* busy packet received */
 356         RXRPC_CALL_EV_RCVD_ABORT,       /* abort packet received */
 357         RXRPC_CALL_EV_RCVD_ERROR,       /* network error received */
 358         RXRPC_CALL_EV_ACK_FINAL,        /* need to generate final ACK (and release call) */
 359         RXRPC_CALL_EV_ACK,              /* need to generate ACK */
 360         RXRPC_CALL_EV_REJECT_BUSY,      /* need to generate busy message */
 361         RXRPC_CALL_EV_ABORT,            /* need to generate abort */
 362         RXRPC_CALL_EV_CONN_ABORT,       /* local connection abort generated */
 363         RXRPC_CALL_EV_RESEND_TIMER,     /* Tx resend timer expired */
 364         RXRPC_CALL_EV_RESEND,           /* Tx resend required */
 365         RXRPC_CALL_EV_DRAIN_RX_OOS,     /* drain the Rx out of sequence queue */
 366         RXRPC_CALL_EV_LIFE_TIMER,       /* call's lifetimer ran out */
 367         RXRPC_CALL_EV_ACCEPTED,         /* incoming call accepted by userspace app */
 368         RXRPC_CALL_EV_SECURED,          /* incoming call's connection is now secure */
 369         RXRPC_CALL_EV_POST_ACCEPT,      /* need to post an "accept?" message to the app */
 370         RXRPC_CALL_EV_RELEASE,          /* need to release the call's resources */
 371 };
 372
 373 /*
 374  * The states that a call can be in.
 375  */
 376 enum rxrpc_call_state {
 377         RXRPC_CALL_UNINITIALISED,
 378         RXRPC_CALL_CLIENT_AWAIT_CONN,   /* - client waiting for connection to become available */
 379         RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
 380         RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
 381         RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
 382         RXRPC_CALL_CLIENT_FINAL_ACK,    /* - client sending final ACK phase */
 383         RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
 384         RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
 385         RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
 386         RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
 387         RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
 388         RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
 389         RXRPC_CALL_COMPLETE,            /* - call completed */
 390         RXRPC_CALL_SERVER_BUSY,         /* - call rejected by busy server */
 391         RXRPC_CALL_REMOTELY_ABORTED,    /* - call aborted by peer */
 392         RXRPC_CALL_LOCALLY_ABORTED,     /* - call aborted locally on error or close */
 393         RXRPC_CALL_NETWORK_ERROR,       /* - call terminated by network error */
 394         RXRPC_CALL_DEAD,                /* - call is dead */
 395         NR__RXRPC_CALL_STATES
 396 };
 397
 398 /*
 399  * RxRPC call definition
 400  * - matched by { connection, call_id }
 401  */
 402 struct rxrpc_call {
 403         struct rcu_head         rcu;
 404         struct rxrpc_connection *conn;          /* connection carrying call */
 405         struct rxrpc_sock       *socket;        /* socket responsible */
 406         struct timer_list       lifetimer;      /* lifetime remaining on call */
 407         struct timer_list       deadspan;       /* reap timer for re-ACK'ing, etc  */
 408         struct timer_list       ack_timer;      /* ACK generation timer */
 409         struct timer_list       resend_timer;   /* Tx resend timer */
 410         struct work_struct      destroyer;      /* call destroyer */
 411         struct work_struct      processor;      /* packet processor and ACK generator */
 412         struct list_head        link;           /* link in master call list */
 413         struct hlist_node       error_link;     /* link in error distribution list */
 414         struct list_head        accept_link;    /* calls awaiting acceptance */
 415         struct rb_node          sock_node;      /* node in socket call tree */
 416         struct sk_buff_head     rx_queue;       /* received packets */
 417         struct sk_buff_head     rx_oos_queue;   /* packets received out of sequence */
 418         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
 419         wait_queue_head_t       tx_waitq;       /* wait for Tx window space to become available */
 420         __be32                  crypto_buf[2];  /* Temporary packet crypto buffer */
 421         unsigned long           user_call_ID;   /* user-defined call ID */
 422         unsigned long           creation_jif;   /* time of call creation */
 423         unsigned long           flags;
 424         unsigned long           events;
 425         spinlock_t              lock;
 426         rwlock_t                state_lock;     /* lock for state transition */
 427         atomic_t                usage;
 428         atomic_t                skb_count;      /* Outstanding packets on this call */
 429         atomic_t                sequence;       /* Tx data packet sequence counter */
 430         u32                     local_abort;    /* local abort code */
 431         u32                     remote_abort;   /* remote abort code */
 432         int                     error_report;   /* Network error (ICMP/local transport) */
 433         int                     error;          /* Local error incurred */
 434         enum rxrpc_call_state   state : 8;      /* current state of call */
 435         int                     debug_id;       /* debug ID for printks */
 436         u8                      channel;        /* connection channel occupied by this call */
 437
 438         /* transmission-phase ACK management */
 439         u8                      acks_head;      /* offset into window of first entry */
 440         u8                      acks_tail;      /* offset into window of last entry */
 441         u8                      acks_winsz;     /* size of un-ACK'd window */
 442         u8                      acks_unacked;   /* lowest unacked packet in last ACK received */
 443         int                     acks_latest;    /* serial number of latest ACK received */
 444         rxrpc_seq_t             acks_hard;      /* highest definitively ACK'd msg seq */
 445         unsigned long           *acks_window;   /* sent packet window
 446                                                  * - elements are pointers with LSB set if ACK'd
 447                                                  */
 448
 449         /* receive-phase ACK management */
 450         rxrpc_seq_t             rx_data_expect; /* next data seq ID expected to be received */
 451         rxrpc_seq_t             rx_data_post;   /* next data seq ID expected to be posted */
 452         rxrpc_seq_t             rx_data_recv;   /* last data seq ID encountered by recvmsg */
 453         rxrpc_seq_t             rx_data_eaten;  /* last data seq ID consumed by recvmsg */
 454         rxrpc_seq_t             rx_first_oos;   /* first packet in rx_oos_queue (or 0) */
 455         rxrpc_seq_t             ackr_win_top;   /* top of ACK window (rx_data_eaten is bottom) */
 456         rxrpc_seq_t             ackr_prev_seq;  /* previous sequence number received */
 457         u8                      ackr_reason;    /* reason to ACK */
 458         rxrpc_serial_t          ackr_serial;    /* serial of packet being ACK'd */
 459         atomic_t                ackr_not_idle;  /* number of packets in Rx queue */
 460
 461         /* received packet records, 1 bit per record */
 462 #define RXRPC_ACKR_WINDOW_ASZ DIV_ROUND_UP(RXRPC_MAXACKS, BITS_PER_LONG)
 463         unsigned long           ackr_window[RXRPC_ACKR_WINDOW_ASZ + 1];
 464
 465         u8                      in_clientflag;  /* Copy of conn->in_clientflag */
 466         struct rxrpc_local      *local;         /* Local endpoint. */
 467         u32                     call_id;        /* call ID on connection  */
 468         u32                     cid;            /* connection ID plus channel index */
 469         u32                     epoch;          /* epoch of this connection */
 470         u16                     service_id;     /* service ID */
 471 };
 472
 473 /*
 474  * locally abort an RxRPC call
 475  */
 476 static inline void rxrpc_abort_call(struct rxrpc_call *call, u32 abort_code)
 477 {
 478         write_lock_bh(&call->state_lock);
 479         if (call->state < RXRPC_CALL_COMPLETE) {
 480                 call->local_abort = abort_code;
 481                 call->state = RXRPC_CALL_LOCALLY_ABORTED;
 482                 set_bit(RXRPC_CALL_EV_ABORT, &call->events);
 483         }
 484         write_unlock_bh(&call->state_lock);
 485 }
 486
 487 /*
 488  * af_rxrpc.c
 489  */
 490 extern atomic_t rxrpc_n_skbs;
 491 extern u32 rxrpc_epoch;
 492 extern atomic_t rxrpc_debug_id;
 493 extern struct workqueue_struct *rxrpc_workqueue;
 494
 495 /*
 496  * call_accept.c
 497  */
 498 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
 499 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long);
 500 int rxrpc_reject_call(struct rxrpc_sock *);
 501
 502 /*
 503  * call_event.c
 504  */
 505 void __rxrpc_propose_ACK(struct rxrpc_call *, u8, u32, bool);
 506 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u32, bool);
 507 void rxrpc_process_call(struct work_struct *);
 508
 509 /*
 510  * call_object.c
 511  */
 512 extern unsigned int rxrpc_max_call_lifetime;
 513 extern unsigned int rxrpc_dead_call_expiry;
 514 extern struct kmem_cache *rxrpc_call_jar;
 515 extern struct list_head rxrpc_calls;
 516 extern rwlock_t rxrpc_call_lock;
 517
 518 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
 519 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
 520                                          struct rxrpc_conn_parameters *,
 521                                          struct sockaddr_rxrpc *,
 522                                          unsigned long, gfp_t);
 523 struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *,
 524                                        struct rxrpc_connection *,
 525                                        struct sk_buff *);
 526 void rxrpc_release_call(struct rxrpc_call *);
 527 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 528 void __rxrpc_put_call(struct rxrpc_call *);
 529 void __exit rxrpc_destroy_all_calls(void);
 530
 531 /*
 532  * conn_client.c
 533  */
 534 extern struct idr rxrpc_client_conn_ids;
 535
 536 void rxrpc_destroy_client_conn_ids(void);
 537 int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *,
 538                        struct sockaddr_rxrpc *, gfp_t);
 539 void rxrpc_unpublish_client_conn(struct rxrpc_connection *);
 540
 541 /*
 542  * conn_event.c
 543  */
 544 void rxrpc_process_connection(struct work_struct *);
 545 void rxrpc_reject_packet(struct rxrpc_local *, struct sk_buff *);
 546 void rxrpc_reject_packets(struct rxrpc_local *);
 547
 548 /*
 549  * conn_object.c
 550  */
 551 extern unsigned int rxrpc_connection_expiry;
 552 extern struct list_head rxrpc_connections;
 553 extern rwlock_t rxrpc_connection_lock;
 554
 555 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
 556 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
 557 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
 558                                                    struct sk_buff *);
 559 void __rxrpc_disconnect_call(struct rxrpc_call *);
 560 void rxrpc_disconnect_call(struct rxrpc_call *);
 561 void rxrpc_put_connection(struct rxrpc_connection *);
 562 void __exit rxrpc_destroy_all_connections(void);
 563
 564 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
 565 {
 566         return conn->out_clientflag;
 567 }
 568
 569 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
 570 {
 571         return !rxrpc_conn_is_client(conn);
 572 }
 573
 574 static inline void rxrpc_get_connection(struct rxrpc_connection *conn)
 575 {
 576         atomic_inc(&conn->usage);
 577 }
 578
 579 static inline
 580 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *conn)
 581 {
 582         return atomic_inc_not_zero(&conn->usage) ? conn : NULL;
 583 }
 584
 585 static inline bool rxrpc_queue_conn(struct rxrpc_connection *conn)
 586 {
 587         if (!rxrpc_get_connection_maybe(conn))
 588                 return false;
 589         if (!rxrpc_queue_work(&conn->processor))
 590                 rxrpc_put_connection(conn);
 591         return true;
 592 }
 593
 594 /*
 595  * conn_service.c
 596  */
 597 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
 598                                                      struct sk_buff *);
 599 struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_local *,
 600                                                    struct sockaddr_rxrpc *,
 601                                                    struct sk_buff *);
 602 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
 603
 604 /*
 605  * input.c
 606  */
 607 void rxrpc_data_ready(struct sock *);
 608 int rxrpc_queue_rcv_skb(struct rxrpc_call *, struct sk_buff *, bool, bool);
 609 void rxrpc_fast_process_packet(struct rxrpc_call *, struct sk_buff *);
 610
 611 /*
 612  * insecure.c
 613  */
 614 extern const struct rxrpc_security rxrpc_no_security;
 615
 616 /*
 617  * key.c
 618  */
 619 extern struct key_type key_type_rxrpc;
 620 extern struct key_type key_type_rxrpc_s;
 621
 622 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
 623 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
 624 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time_t,
 625                               u32);
 626
 627 /*
 628  * local_event.c
 629  */
 630 extern void rxrpc_process_local_events(struct rxrpc_local *);
 631
 632 /*
 633  * local_object.c
 634  */
 635 struct rxrpc_local *rxrpc_lookup_local(const struct sockaddr_rxrpc *);
 636 void __rxrpc_put_local(struct rxrpc_local *);
 637 void __exit rxrpc_destroy_all_locals(void);
 638
 639 static inline void rxrpc_get_local(struct rxrpc_local *local)
 640 {
 641         atomic_inc(&local->usage);
 642 }
 643
 644 static inline
 645 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local)
 646 {
 647         return atomic_inc_not_zero(&local->usage) ? local : NULL;
 648 }
 649
 650 static inline void rxrpc_put_local(struct rxrpc_local *local)
 651 {
 652         if (local && atomic_dec_and_test(&local->usage))
 653                 __rxrpc_put_local(local);
 654 }
 655
 656 static inline void rxrpc_queue_local(struct rxrpc_local *local)
 657 {
 658         rxrpc_queue_work(&local->processor);
 659 }
 660
 661 /*
 662  * misc.c
 663  */
 664 extern unsigned int rxrpc_max_backlog __read_mostly;
 665 extern unsigned int rxrpc_requested_ack_delay;
 666 extern unsigned int rxrpc_soft_ack_delay;
 667 extern unsigned int rxrpc_idle_ack_delay;
 668 extern unsigned int rxrpc_rx_window_size;
 669 extern unsigned int rxrpc_rx_mtu;
 670 extern unsigned int rxrpc_rx_jumbo_max;
 671
 672 extern const char *const rxrpc_pkts[];
 673 extern const s8 rxrpc_ack_priority[];
 674
 675 extern const char *rxrpc_acks(u8 reason);
 676
 677 /*
 678  * output.c
 679  */
 680 extern unsigned int rxrpc_resend_timeout;
 681
 682 int rxrpc_send_data_packet(struct rxrpc_connection *, struct sk_buff *);
 683 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
 684
 685 /*
 686  * peer_event.c
 687  */
 688 void rxrpc_error_report(struct sock *);
 689 void rxrpc_peer_error_distributor(struct work_struct *);
 690
 691 /*
 692  * peer_object.c
 693  */
 694 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
 695                                          const struct sockaddr_rxrpc *);
 696 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *,
 697                                      struct sockaddr_rxrpc *, gfp_t);
 698 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
 699
 700 static inline void rxrpc_get_peer(struct rxrpc_peer *peer)
 701 {
 702         atomic_inc(&peer->usage);
 703 }
 704
 705 static inline
 706 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer)
 707 {
 708         return atomic_inc_not_zero(&peer->usage) ? peer : NULL;
 709 }
 710
 711 extern void __rxrpc_put_peer(struct rxrpc_peer *peer);
 712 static inline void rxrpc_put_peer(struct rxrpc_peer *peer)
 713 {
 714         if (peer && atomic_dec_and_test(&peer->usage))
 715                 __rxrpc_put_peer(peer);
 716 }
 717
 718 /*
 719  * proc.c
 720  */
 721 extern const char *const rxrpc_call_states[];
 722 extern const struct file_operations rxrpc_call_seq_fops;
 723 extern const struct file_operations rxrpc_connection_seq_fops;
 724
 725 /*
 726  * recvmsg.c
 727  */
 728 void rxrpc_remove_user_ID(struct rxrpc_sock *, struct rxrpc_call *);
 729 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
 730
 731 /*
 732  * rxkad.c
 733  */
 734 #ifdef CONFIG_RXKAD
 735 extern const struct rxrpc_security rxkad;
 736 #endif
 737
 738 /*
 739  * security.c
 740  */
 741 int __init rxrpc_init_security(void);
 742 void rxrpc_exit_security(void);
 743 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
 744 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
 745
 746 /*
 747  * skbuff.c
 748  */
 749 void rxrpc_packet_destructor(struct sk_buff *);
 750
 751 /*
 752  * sysctl.c
 753  */
 754 #ifdef CONFIG_SYSCTL
 755 extern int __init rxrpc_sysctl_init(void);
 756 extern void rxrpc_sysctl_exit(void);
 757 #else
 758 static inline int __init rxrpc_sysctl_init(void) { return 0; }
 759 static inline void rxrpc_sysctl_exit(void) {}
 760 #endif
 761
 762 /*
 763  * utils.c
 764  */
 765 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
 766
 767 /*
 768  * debug tracing
 769  */
 770 extern unsigned int rxrpc_debug;
 771
 772 #define dbgprintk(FMT,...) \
 773         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
 774
 775 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 776 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 777 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
 778 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
 779 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
 780
 781
 782 #if defined(__KDEBUG)
 783 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
 784 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
 785 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
 786 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
 787 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
 788
 789 #elif defined(CONFIG_AF_RXRPC_DEBUG)
 790 #define RXRPC_DEBUG_KENTER      0x01
 791 #define RXRPC_DEBUG_KLEAVE      0x02
 792 #define RXRPC_DEBUG_KDEBUG      0x04
 793 #define RXRPC_DEBUG_KPROTO      0x08
 794 #define RXRPC_DEBUG_KNET        0x10
 795
 796 #define _enter(FMT,...)                                 \
 797 do {                                                    \
 798         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
 799                 kenter(FMT,##__VA_ARGS__);              \
 800 } while (0)
 801
 802 #define _leave(FMT,...)                                 \
 803 do {                                                    \
 804         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
 805                 kleave(FMT,##__VA_ARGS__);              \
 806 } while (0)
 807
 808 #define _debug(FMT,...)                                 \
 809 do {                                                    \
 810         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
 811                 kdebug(FMT,##__VA_ARGS__);              \
 812 } while (0)
 813
 814 #define _proto(FMT,...)                                 \
 815 do {                                                    \
 816         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
 817                 kproto(FMT,##__VA_ARGS__);              \
 818 } while (0)
 819
 820 #define _net(FMT,...)                                   \
 821 do {                                                    \
 822         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
 823                 knet(FMT,##__VA_ARGS__);                \
 824 } while (0)
 825
 826 #else
 827 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 828 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 829 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
 830 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
 831 #define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
 832 #endif
 833
 834 /*
 835  * debug assertion checking
 836  */
 837 #if 1 // defined(__KDEBUGALL)
 838
 839 #define ASSERT(X)                                               \
 840 do {                                                            \
 841         if (unlikely(!(X))) {                                   \
 842                 pr_err("Assertion failed\n");                   \
 843                 BUG();                                          \
 844         }                                                       \
 845 } while (0)
 846
 847 #define ASSERTCMP(X, OP, Y)                                             \
 848 do {                                                                    \
 849         unsigned long _x = (unsigned long)(X);                          \
 850         unsigned long _y = (unsigned long)(Y);                          \
 851         if (unlikely(!(_x OP _y))) {                                    \
 852                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n",                        \
 853                        _x, _x, #OP, _y, _y);                            \
 854                 BUG();                                                  \
 855         }                                                               \
 856 } while (0)
 857
 858 #define ASSERTIF(C, X)                                          \
 859 do {                                                            \
 860         if (unlikely((C) && !(X))) {                            \
 861                 pr_err("Assertion failed\n");                   \
 862                 BUG();                                          \
 863         }                                                       \
 864 } while (0)
 865
 866 #define ASSERTIFCMP(C, X, OP, Y)                                        \
 867 do {                                                                    \
 868         unsigned long _x = (unsigned long)(X);                          \
 869         unsigned long _y = (unsigned long)(Y);                          \
 870         if (unlikely((C) && !(_x OP _y))) {                             \
 871                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
 872                        _x, _x, #OP, _y, _y);                            \
 873                 BUG();                                                  \
 874         }                                                               \
 875 } while (0)
 876
 877 #else
 878
 879 #define ASSERT(X)                               \
 880 do {                                            \
 881 } while (0)
 882
 883 #define ASSERTCMP(X, OP, Y)                     \
 884 do {                                            \
 885 } while (0)
 886
 887 #define ASSERTIF(C, X)                          \
 888 do {                                            \
 889 } while (0)
 890
 891 #define ASSERTIFCMP(C, X, OP, Y)                \
 892 do {                                            \
 893 } while (0)
 894
 895 #endif /* __KDEBUGALL */
 896
 897 /*
 898  * socket buffer accounting / leak finding
 899  */
 900 static inline void __rxrpc_new_skb(struct sk_buff *skb, const char *fn)
 901 {
 902         //_net("new skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
 903         //atomic_inc(&rxrpc_n_skbs);
 904 }
 905
 906 #define rxrpc_new_skb(skb) __rxrpc_new_skb((skb), __func__)
 907
 908 static inline void __rxrpc_kill_skb(struct sk_buff *skb, const char *fn)
 909 {
 910         //_net("kill skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
 911         //atomic_dec(&rxrpc_n_skbs);
 912 }
 913
 914 #define rxrpc_kill_skb(skb) __rxrpc_kill_skb((skb), __func__)
 915
 916 static inline void __rxrpc_free_skb(struct sk_buff *skb, const char *fn)
 917 {
 918         if (skb) {
 919                 CHECK_SLAB_OKAY(&skb->users);
 920                 //_net("free skb %p %s [%d]",
 921                 //     skb, fn, atomic_read(&rxrpc_n_skbs));
 922                 //atomic_dec(&rxrpc_n_skbs);
 923                 kfree_skb(skb);
 924         }
 925 }
 926
 927 #define rxrpc_free_skb(skb) __rxrpc_free_skb((skb), __func__)
 928
 929 static inline void rxrpc_purge_queue(struct sk_buff_head *list)
 930 {
 931         struct sk_buff *skb;
 932         while ((skb = skb_dequeue((list))) != NULL)
 933                 rxrpc_free_skb(skb);
 934 }
 935
 936 #define rxrpc_get_call(CALL)                            \
 937 do {                                                    \
 938         CHECK_SLAB_OKAY(&(CALL)->usage);                \
 939         if (atomic_inc_return(&(CALL)->usage) == 1)     \
 940                 BUG();                                  \
 941 } while (0)
 942
 943 #define rxrpc_put_call(CALL)                            \
 944 do {                                                    \
 945         __rxrpc_put_call(CALL);                         \
 946 } while (0)