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/net_namespace.h>
  15 #include <net/netns/generic.h>
  16 #include <net/sock.h>
  17 #include <net/af_rxrpc.h>
  18 #include <rxrpc/packet.h>
  19
  20 #if 0
  21 #define CHECK_SLAB_OKAY(X)                                   \
  22         BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
  23                (POISON_FREE << 8 | POISON_FREE))
  24 #else
  25 #define CHECK_SLAB_OKAY(X) do {} while (0)
  26 #endif
  27
  28 #define FCRYPT_BSIZE 8
  29 struct rxrpc_crypt {
  30         union {
  31                 u8      x[FCRYPT_BSIZE];
  32                 __be32  n[2];
  33         };
  34 } __attribute__((aligned(8)));
  35
  36 #define rxrpc_queue_work(WS)    queue_work(rxrpc_workqueue, (WS))
  37 #define rxrpc_queue_delayed_work(WS,D)  \
  38         queue_delayed_work(rxrpc_workqueue, (WS), (D))
  39
  40 struct rxrpc_connection;
  41
  42 /*
  43  * Mark applied to socket buffers.
  44  */
  45 enum rxrpc_skb_mark {
  46         RXRPC_SKB_MARK_DATA,            /* data message */
  47         RXRPC_SKB_MARK_FINAL_ACK,       /* final ACK received message */
  48         RXRPC_SKB_MARK_BUSY,            /* server busy message */
  49         RXRPC_SKB_MARK_REMOTE_ABORT,    /* remote abort message */
  50         RXRPC_SKB_MARK_LOCAL_ABORT,     /* local abort message */
  51         RXRPC_SKB_MARK_NET_ERROR,       /* network error message */
  52         RXRPC_SKB_MARK_LOCAL_ERROR,     /* local error message */
  53         RXRPC_SKB_MARK_NEW_CALL,        /* local error message */
  54 };
  55
  56 /*
  57  * sk_state for RxRPC sockets
  58  */
  59 enum {
  60         RXRPC_UNBOUND = 0,
  61         RXRPC_CLIENT_UNBOUND,           /* Unbound socket used as client */
  62         RXRPC_CLIENT_BOUND,             /* client local address bound */
  63         RXRPC_SERVER_BOUND,             /* server local address bound */
  64         RXRPC_SERVER_BOUND2,            /* second server local address bound */
  65         RXRPC_SERVER_LISTENING,         /* server listening for connections */
  66         RXRPC_SERVER_LISTEN_DISABLED,   /* server listening disabled */
  67         RXRPC_CLOSE,                    /* socket is being closed */
  68 };
  69
  70 /*
  71  * Per-network namespace data.
  72  */
  73 struct rxrpc_net {
  74         struct proc_dir_entry   *proc_net;      /* Subdir in /proc/net */
  75         u32                     epoch;          /* Local epoch for detecting local-end reset */
  76         struct list_head        calls;          /* List of calls active in this namespace */
  77         rwlock_t                call_lock;      /* Lock for ->calls */
  78
  79         struct list_head        conn_proc_list; /* List of conns in this namespace for proc */
  80         struct list_head        service_conns;  /* Service conns in this namespace */
  81         rwlock_t                conn_lock;      /* Lock for ->conn_proc_list, ->service_conns */
  82         struct delayed_work     service_conn_reaper;
  83
  84         unsigned int            nr_client_conns;
  85         unsigned int            nr_active_client_conns;
  86         bool                    kill_all_client_conns;
  87         spinlock_t              client_conn_cache_lock; /* Lock for ->*_client_conns */
  88         spinlock_t              client_conn_discard_lock; /* Prevent multiple discarders */
  89         struct list_head        waiting_client_conns;
  90         struct list_head        active_client_conns;
  91         struct list_head        idle_client_conns;
  92         struct delayed_work     client_conn_reaper;
  93
  94         struct list_head        local_endpoints;
  95         struct mutex            local_mutex;    /* Lock for ->local_endpoints */
  96
  97         spinlock_t              peer_hash_lock; /* Lock for ->peer_hash */
  98         DECLARE_HASHTABLE       (peer_hash, 10);
  99 };
 100
 101 /*
 102  * Service backlog preallocation.
 103  *
 104  * This contains circular buffers of preallocated peers, connections and calls
 105  * for incoming service calls and their head and tail pointers.  This allows
 106  * calls to be set up in the data_ready handler, thereby avoiding the need to
 107  * shuffle packets around so much.
 108  */
 109 struct rxrpc_backlog {
 110         unsigned short          peer_backlog_head;
 111         unsigned short          peer_backlog_tail;
 112         unsigned short          conn_backlog_head;
 113         unsigned short          conn_backlog_tail;
 114         unsigned short          call_backlog_head;
 115         unsigned short          call_backlog_tail;
 116 #define RXRPC_BACKLOG_MAX       32
 117         struct rxrpc_peer       *peer_backlog[RXRPC_BACKLOG_MAX];
 118         struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
 119         struct rxrpc_call       *call_backlog[RXRPC_BACKLOG_MAX];
 120 };
 121
 122 /*
 123  * RxRPC socket definition
 124  */
 125 struct rxrpc_sock {
 126         /* WARNING: sk has to be the first member */
 127         struct sock             sk;
 128         rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
 129         rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
 130         struct rxrpc_local      *local;         /* local endpoint */
 131         struct rxrpc_backlog    *backlog;       /* Preallocation for services */
 132         spinlock_t              incoming_lock;  /* Incoming call vs service shutdown lock */
 133         struct list_head        sock_calls;     /* List of calls owned by this socket */
 134         struct list_head        to_be_accepted; /* calls awaiting acceptance */
 135         struct list_head        recvmsg_q;      /* Calls awaiting recvmsg's attention  */
 136         rwlock_t                recvmsg_lock;   /* Lock for recvmsg_q */
 137         struct key              *key;           /* security for this socket */
 138         struct key              *securities;    /* list of server security descriptors */
 139         struct rb_root          calls;          /* User ID -> call mapping */
 140         unsigned long           flags;
 141 #define RXRPC_SOCK_CONNECTED            0       /* connect_srx is set */
 142         rwlock_t                call_lock;      /* lock for calls */
 143         u32                     min_sec_level;  /* minimum security level */
 144 #define RXRPC_SECURITY_MAX      RXRPC_SECURITY_ENCRYPT
 145         bool                    exclusive;      /* Exclusive connection for a client socket */
 146         u16                     second_service; /* Additional service bound to the endpoint */
 147         struct {
 148                 /* Service upgrade information */
 149                 u16             from;           /* Service ID to upgrade (if not 0) */
 150                 u16             to;             /* service ID to upgrade to */
 151         } service_upgrade;
 152         sa_family_t             family;         /* Protocol family created with */
 153         struct sockaddr_rxrpc   srx;            /* Primary Service/local addresses */
 154         struct sockaddr_rxrpc   connect_srx;    /* Default client address from connect() */
 155 };
 156
 157 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
 158
 159 /*
 160  * CPU-byteorder normalised Rx packet header.
 161  */
 162 struct rxrpc_host_header {
 163         u32             epoch;          /* client boot timestamp */
 164         u32             cid;            /* connection and channel ID */
 165         u32             callNumber;     /* call ID (0 for connection-level packets) */
 166         u32             seq;            /* sequence number of pkt in call stream */
 167         u32             serial;         /* serial number of pkt sent to network */
 168         u8              type;           /* packet type */
 169         u8              flags;          /* packet flags */
 170         u8              userStatus;     /* app-layer defined status */
 171         u8              securityIndex;  /* security protocol ID */
 172         union {
 173                 u16     _rsvd;          /* reserved */
 174                 u16     cksum;          /* kerberos security checksum */
 175         };
 176         u16             serviceId;      /* service ID */
 177 } __packed;
 178
 179 /*
 180  * RxRPC socket buffer private variables
 181  * - max 48 bytes (struct sk_buff::cb)
 182  */
 183 struct rxrpc_skb_priv {
 184         union {
 185                 u8              nr_jumbo;       /* Number of jumbo subpackets */
 186         };
 187         union {
 188                 int             remain;         /* amount of space remaining for next write */
 189         };
 190
 191         struct rxrpc_host_header hdr;           /* RxRPC packet header from this packet */
 192 };
 193
 194 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
 195
 196 /*
 197  * RxRPC security module interface
 198  */
 199 struct rxrpc_security {
 200         const char              *name;          /* name of this service */
 201         u8                      security_index; /* security type provided */
 202
 203         /* Initialise a security service */
 204         int (*init)(void);
 205
 206         /* Clean up a security service */
 207         void (*exit)(void);
 208
 209         /* initialise a connection's security */
 210         int (*init_connection_security)(struct rxrpc_connection *);
 211
 212         /* prime a connection's packet security */
 213         int (*prime_packet_security)(struct rxrpc_connection *);
 214
 215         /* impose security on a packet */
 216         int (*secure_packet)(struct rxrpc_call *,
 217                              struct sk_buff *,
 218                              size_t,
 219                              void *);
 220
 221         /* verify the security on a received packet */
 222         int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
 223                              unsigned int, unsigned int, rxrpc_seq_t, u16);
 224
 225         /* Locate the data in a received packet that has been verified. */
 226         void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
 227                             unsigned int *, unsigned int *);
 228
 229         /* issue a challenge */
 230         int (*issue_challenge)(struct rxrpc_connection *);
 231
 232         /* respond to a challenge */
 233         int (*respond_to_challenge)(struct rxrpc_connection *,
 234                                     struct sk_buff *,
 235                                     u32 *);
 236
 237         /* verify a response */
 238         int (*verify_response)(struct rxrpc_connection *,
 239                                struct sk_buff *,
 240                                u32 *);
 241
 242         /* clear connection security */
 243         void (*clear)(struct rxrpc_connection *);
 244 };
 245
 246 /*
 247  * RxRPC local transport endpoint description
 248  * - owned by a single AF_RXRPC socket
 249  * - pointed to by transport socket struct sk_user_data
 250  */
 251 struct rxrpc_local {
 252         struct rcu_head         rcu;
 253         atomic_t                usage;
 254         struct rxrpc_net        *rxnet;         /* The network ns in which this resides */
 255         struct list_head        link;
 256         struct socket           *socket;        /* my UDP socket */
 257         struct work_struct      processor;
 258         struct rxrpc_sock __rcu *service;       /* Service(s) listening on this endpoint */
 259         struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
 260         struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
 261         struct sk_buff_head     event_queue;    /* endpoint event packets awaiting processing */
 262         struct rb_root          client_conns;   /* Client connections by socket params */
 263         spinlock_t              client_conns_lock; /* Lock for client_conns */
 264         spinlock_t              lock;           /* access lock */
 265         rwlock_t                services_lock;  /* lock for services list */
 266         int                     debug_id;       /* debug ID for printks */
 267         bool                    dead;
 268         struct sockaddr_rxrpc   srx;            /* local address */
 269 };
 270
 271 /*
 272  * RxRPC remote transport endpoint definition
 273  * - matched by local endpoint, remote port, address and protocol type
 274  */
 275 struct rxrpc_peer {
 276         struct rcu_head         rcu;            /* This must be first */
 277         atomic_t                usage;
 278         unsigned long           hash_key;
 279         struct hlist_node       hash_link;
 280         struct rxrpc_local      *local;
 281         struct hlist_head       error_targets;  /* targets for net error distribution */
 282         struct work_struct      error_distributor;
 283         struct rb_root          service_conns;  /* Service connections */
 284         seqlock_t               service_conn_lock;
 285         spinlock_t              lock;           /* access lock */
 286         unsigned int            if_mtu;         /* interface MTU for this peer */
 287         unsigned int            mtu;            /* network MTU for this peer */
 288         unsigned int            maxdata;        /* data size (MTU - hdrsize) */
 289         unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
 290         int                     debug_id;       /* debug ID for printks */
 291         int                     error_report;   /* Net (+0) or local (+1000000) to distribute */
 292 #define RXRPC_LOCAL_ERROR_OFFSET 1000000
 293         struct sockaddr_rxrpc   srx;            /* remote address */
 294
 295         /* calculated RTT cache */
 296 #define RXRPC_RTT_CACHE_SIZE 32
 297         ktime_t                 rtt_last_req;   /* Time of last RTT request */
 298         u64                     rtt;            /* Current RTT estimate (in nS) */
 299         u64                     rtt_sum;        /* Sum of cache contents */
 300         u64                     rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */
 301         u8                      rtt_cursor;     /* next entry at which to insert */
 302         u8                      rtt_usage;      /* amount of cache actually used */
 303 };
 304
 305 /*
 306  * Keys for matching a connection.
 307  */
 308 struct rxrpc_conn_proto {
 309         union {
 310                 struct {
 311                         u32     epoch;          /* epoch of this connection */
 312                         u32     cid;            /* connection ID */
 313                 };
 314                 u64             index_key;
 315         };
 316 };
 317
 318 struct rxrpc_conn_parameters {
 319         struct rxrpc_local      *local;         /* Representation of local endpoint */
 320         struct rxrpc_peer       *peer;          /* Remote endpoint */
 321         struct key              *key;           /* Security details */
 322         bool                    exclusive;      /* T if conn is exclusive */
 323         bool                    upgrade;        /* T if service ID can be upgraded */
 324         u16                     service_id;     /* Service ID for this connection */
 325         u32                     security_level; /* Security level selected */
 326 };
 327
 328 /*
 329  * Bits in the connection flags.
 330  */
 331 enum rxrpc_conn_flag {
 332         RXRPC_CONN_HAS_IDR,             /* Has a client conn ID assigned */
 333         RXRPC_CONN_IN_SERVICE_CONNS,    /* Conn is in peer->service_conns */
 334         RXRPC_CONN_IN_CLIENT_CONNS,     /* Conn is in local->client_conns */
 335         RXRPC_CONN_EXPOSED,             /* Conn has extra ref for exposure */
 336         RXRPC_CONN_DONT_REUSE,          /* Don't reuse this connection */
 337         RXRPC_CONN_COUNTED,             /* Counted by rxrpc_nr_client_conns */
 338         RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */
 339 };
 340
 341 /*
 342  * Events that can be raised upon a connection.
 343  */
 344 enum rxrpc_conn_event {
 345         RXRPC_CONN_EV_CHALLENGE,        /* Send challenge packet */
 346 };
 347
 348 /*
 349  * The connection cache state.
 350  */
 351 enum rxrpc_conn_cache_state {
 352         RXRPC_CONN_CLIENT_INACTIVE,     /* Conn is not yet listed */
 353         RXRPC_CONN_CLIENT_WAITING,      /* Conn is on wait list, waiting for capacity */
 354         RXRPC_CONN_CLIENT_ACTIVE,       /* Conn is on active list, doing calls */
 355         RXRPC_CONN_CLIENT_UPGRADE,      /* Conn is on active list, probing for upgrade */
 356         RXRPC_CONN_CLIENT_CULLED,       /* Conn is culled and delisted, doing calls */
 357         RXRPC_CONN_CLIENT_IDLE,         /* Conn is on idle list, doing mostly nothing */
 358         RXRPC_CONN__NR_CACHE_STATES
 359 };
 360
 361 /*
 362  * The connection protocol state.
 363  */
 364 enum rxrpc_conn_proto_state {
 365         RXRPC_CONN_UNUSED,              /* Connection not yet attempted */
 366         RXRPC_CONN_CLIENT,              /* Client connection */
 367         RXRPC_CONN_SERVICE_PREALLOC,    /* Service connection preallocation */
 368         RXRPC_CONN_SERVICE_UNSECURED,   /* Service unsecured connection */
 369         RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
 370         RXRPC_CONN_SERVICE,             /* Service secured connection */
 371         RXRPC_CONN_REMOTELY_ABORTED,    /* Conn aborted by peer */
 372         RXRPC_CONN_LOCALLY_ABORTED,     /* Conn aborted locally */
 373         RXRPC_CONN__NR_STATES
 374 };
 375
 376 /*
 377  * RxRPC connection definition
 378  * - matched by { local, peer, epoch, conn_id, direction }
 379  * - each connection can only handle four simultaneous calls
 380  */
 381 struct rxrpc_connection {
 382         struct rxrpc_conn_proto proto;
 383         struct rxrpc_conn_parameters params;
 384
 385         atomic_t                usage;
 386         struct rcu_head         rcu;
 387         struct list_head        cache_link;
 388
 389         spinlock_t              channel_lock;
 390         unsigned char           active_chans;   /* Mask of active channels */
 391 #define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1)
 392         struct list_head        waiting_calls;  /* Calls waiting for channels */
 393         struct rxrpc_channel {
 394                 struct rxrpc_call __rcu *call;          /* Active call */
 395                 u32                     call_id;        /* ID of current call */
 396                 u32                     call_counter;   /* Call ID counter */
 397                 u32                     last_call;      /* ID of last call */
 398                 u8                      last_type;      /* Type of last packet */
 399                 union {
 400                         u32             last_seq;
 401                         u32             last_abort;
 402                 };
 403         } channels[RXRPC_MAXCALLS];
 404
 405         struct work_struct      processor;      /* connection event processor */
 406         union {
 407                 struct rb_node  client_node;    /* Node in local->client_conns */
 408                 struct rb_node  service_node;   /* Node in peer->service_conns */
 409         };
 410         struct list_head        proc_link;      /* link in procfs list */
 411         struct list_head        link;           /* link in master connection list */
 412         struct sk_buff_head     rx_queue;       /* received conn-level packets */
 413         const struct rxrpc_security *security;  /* applied security module */
 414         struct key              *server_key;    /* security for this service */
 415         struct crypto_skcipher  *cipher;        /* encryption handle */
 416         struct rxrpc_crypt      csum_iv;        /* packet checksum base */
 417         unsigned long           flags;
 418         unsigned long           events;
 419         unsigned long           idle_timestamp; /* Time at which last became idle */
 420         spinlock_t              state_lock;     /* state-change lock */
 421         enum rxrpc_conn_cache_state cache_state;
 422         enum rxrpc_conn_proto_state state;      /* current state of connection */
 423         u32                     local_abort;    /* local abort code */
 424         u32                     remote_abort;   /* remote abort code */
 425         int                     debug_id;       /* debug ID for printks */
 426         atomic_t                serial;         /* packet serial number counter */
 427         unsigned int            hi_serial;      /* highest serial number received */
 428         u32                     security_nonce; /* response re-use preventer */
 429         u16                     service_id;     /* Service ID, possibly upgraded */
 430         u8                      size_align;     /* data size alignment (for security) */
 431         u8                      security_size;  /* security header size */
 432         u8                      security_ix;    /* security type */
 433         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
 434 };
 435
 436 /*
 437  * Flags in call->flags.
 438  */
 439 enum rxrpc_call_flag {
 440         RXRPC_CALL_RELEASED,            /* call has been released - no more message to userspace */
 441         RXRPC_CALL_HAS_USERID,          /* has a user ID attached */
 442         RXRPC_CALL_IS_SERVICE,          /* Call is service call */
 443         RXRPC_CALL_EXPOSED,             /* The call was exposed to the world */
 444         RXRPC_CALL_RX_LAST,             /* Received the last packet (at rxtx_top) */
 445         RXRPC_CALL_TX_LAST,             /* Last packet in Tx buffer (at rxtx_top) */
 446         RXRPC_CALL_SEND_PING,           /* A ping will need to be sent */
 447         RXRPC_CALL_PINGING,             /* Ping in process */
 448         RXRPC_CALL_RETRANS_TIMEOUT,     /* Retransmission due to timeout occurred */
 449 };
 450
 451 /*
 452  * Events that can be raised on a call.
 453  */
 454 enum rxrpc_call_event {
 455         RXRPC_CALL_EV_ACK,              /* need to generate ACK */
 456         RXRPC_CALL_EV_ABORT,            /* need to generate abort */
 457         RXRPC_CALL_EV_TIMER,            /* Timer expired */
 458         RXRPC_CALL_EV_RESEND,           /* Tx resend required */
 459         RXRPC_CALL_EV_PING,             /* Ping send required */
 460 };
 461
 462 /*
 463  * The states that a call can be in.
 464  */
 465 enum rxrpc_call_state {
 466         RXRPC_CALL_UNINITIALISED,
 467         RXRPC_CALL_CLIENT_AWAIT_CONN,   /* - client waiting for connection to become available */
 468         RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
 469         RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
 470         RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
 471         RXRPC_CALL_SERVER_PREALLOC,     /* - service preallocation */
 472         RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
 473         RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
 474         RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
 475         RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
 476         RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
 477         RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
 478         RXRPC_CALL_COMPLETE,            /* - call complete */
 479         NR__RXRPC_CALL_STATES
 480 };
 481
 482 /*
 483  * Call completion condition (state == RXRPC_CALL_COMPLETE).
 484  */
 485 enum rxrpc_call_completion {
 486         RXRPC_CALL_SUCCEEDED,           /* - Normal termination */
 487         RXRPC_CALL_REMOTELY_ABORTED,    /* - call aborted by peer */
 488         RXRPC_CALL_LOCALLY_ABORTED,     /* - call aborted locally on error or close */
 489         RXRPC_CALL_LOCAL_ERROR,         /* - call failed due to local error */
 490         RXRPC_CALL_NETWORK_ERROR,       /* - call terminated by network error */
 491         NR__RXRPC_CALL_COMPLETIONS
 492 };
 493
 494 /*
 495  * Call Tx congestion management modes.
 496  */
 497 enum rxrpc_congest_mode {
 498         RXRPC_CALL_SLOW_START,
 499         RXRPC_CALL_CONGEST_AVOIDANCE,
 500         RXRPC_CALL_PACKET_LOSS,
 501         RXRPC_CALL_FAST_RETRANSMIT,
 502         NR__RXRPC_CONGEST_MODES
 503 };
 504
 505 /*
 506  * RxRPC call definition
 507  * - matched by { connection, call_id }
 508  */
 509 struct rxrpc_call {
 510         struct rcu_head         rcu;
 511         struct rxrpc_connection *conn;          /* connection carrying call */
 512         struct rxrpc_peer       *peer;          /* Peer record for remote address */
 513         struct rxrpc_sock __rcu *socket;        /* socket responsible */
 514         struct mutex            user_mutex;     /* User access mutex */
 515         ktime_t                 ack_at;         /* When deferred ACK needs to happen */
 516         ktime_t                 resend_at;      /* When next resend needs to happen */
 517         ktime_t                 ping_at;        /* When next to send a ping */
 518         ktime_t                 expire_at;      /* When the call times out */
 519         struct timer_list       timer;          /* Combined event timer */
 520         struct work_struct      processor;      /* Event processor */
 521         rxrpc_notify_rx_t       notify_rx;      /* kernel service Rx notification function */
 522         struct list_head        link;           /* link in master call list */
 523         struct list_head        chan_wait_link; /* Link in conn->waiting_calls */
 524         struct hlist_node       error_link;     /* link in error distribution list */
 525         struct list_head        accept_link;    /* Link in rx->acceptq */
 526         struct list_head        recvmsg_link;   /* Link in rx->recvmsg_q */
 527         struct list_head        sock_link;      /* Link in rx->sock_calls */
 528         struct rb_node          sock_node;      /* Node in rx->calls */
 529         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
 530         wait_queue_head_t       waitq;          /* Wait queue for channel or Tx */
 531         __be32                  crypto_buf[2];  /* Temporary packet crypto buffer */
 532         unsigned long           user_call_ID;   /* user-defined call ID */
 533         unsigned long           flags;
 534         unsigned long           events;
 535         spinlock_t              lock;
 536         rwlock_t                state_lock;     /* lock for state transition */
 537         u32                     abort_code;     /* Local/remote abort code */
 538         int                     error;          /* Local error incurred */
 539         enum rxrpc_call_state   state;          /* current state of call */
 540         enum rxrpc_call_completion completion;  /* Call completion condition */
 541         atomic_t                usage;
 542         u16                     service_id;     /* service ID */
 543         u8                      security_ix;    /* Security type */
 544         u32                     call_id;        /* call ID on connection  */
 545         u32                     cid;            /* connection ID plus channel index */
 546         int                     debug_id;       /* debug ID for printks */
 547         unsigned short          rx_pkt_offset;  /* Current recvmsg packet offset */
 548         unsigned short          rx_pkt_len;     /* Current recvmsg packet len */
 549
 550         /* Rx/Tx circular buffer, depending on phase.
 551          *
 552          * In the Rx phase, packets are annotated with 0 or the number of the
 553          * segment of a jumbo packet each buffer refers to.  There can be up to
 554          * 47 segments in a maximum-size UDP packet.
 555          *
 556          * In the Tx phase, packets are annotated with which buffers have been
 557          * acked.
 558          */
 559 #define RXRPC_RXTX_BUFF_SIZE    64
 560 #define RXRPC_RXTX_BUFF_MASK    (RXRPC_RXTX_BUFF_SIZE - 1)
 561 #define RXRPC_INIT_RX_WINDOW_SIZE 32
 562         struct sk_buff          **rxtx_buffer;
 563         u8                      *rxtx_annotations;
 564 #define RXRPC_TX_ANNO_ACK       0
 565 #define RXRPC_TX_ANNO_UNACK     1
 566 #define RXRPC_TX_ANNO_NAK       2
 567 #define RXRPC_TX_ANNO_RETRANS   3
 568 #define RXRPC_TX_ANNO_MASK      0x03
 569 #define RXRPC_TX_ANNO_LAST      0x04
 570 #define RXRPC_TX_ANNO_RESENT    0x08
 571
 572 #define RXRPC_RX_ANNO_JUMBO     0x3f            /* Jumbo subpacket number + 1 if not zero */
 573 #define RXRPC_RX_ANNO_JLAST     0x40            /* Set if last element of a jumbo packet */
 574 #define RXRPC_RX_ANNO_VERIFIED  0x80            /* Set if verified and decrypted */
 575         rxrpc_seq_t             tx_hard_ack;    /* Dead slot in buffer; the first transmitted but
 576                                                  * not hard-ACK'd packet follows this.
 577                                                  */
 578         rxrpc_seq_t             tx_top;         /* Highest Tx slot allocated. */
 579
 580         /* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
 581          * is fixed, we keep these numbers in terms of segments (ie. DATA
 582          * packets) rather than bytes.
 583          */
 584 #define RXRPC_TX_SMSS           RXRPC_JUMBO_DATALEN
 585         u8                      cong_cwnd;      /* Congestion window size */
 586         u8                      cong_extra;     /* Extra to send for congestion management */
 587         u8                      cong_ssthresh;  /* Slow-start threshold */
 588         enum rxrpc_congest_mode cong_mode:8;    /* Congestion management mode */
 589         u8                      cong_dup_acks;  /* Count of ACKs showing missing packets */
 590         u8                      cong_cumul_acks; /* Cumulative ACK count */
 591         ktime_t                 cong_tstamp;    /* Last time cwnd was changed */
 592
 593         rxrpc_seq_t             rx_hard_ack;    /* Dead slot in buffer; the first received but not
 594                                                  * consumed packet follows this.
 595                                                  */
 596         rxrpc_seq_t             rx_top;         /* Highest Rx slot allocated. */
 597         rxrpc_seq_t             rx_expect_next; /* Expected next packet sequence number */
 598         u8                      rx_winsize;     /* Size of Rx window */
 599         u8                      tx_winsize;     /* Maximum size of Tx window */
 600         bool                    tx_phase;       /* T if transmission phase, F if receive phase */
 601         u8                      nr_jumbo_bad;   /* Number of jumbo dups/exceeds-windows */
 602
 603         /* receive-phase ACK management */
 604         u8                      ackr_reason;    /* reason to ACK */
 605         u16                     ackr_skew;      /* skew on packet being ACK'd */
 606         rxrpc_serial_t          ackr_serial;    /* serial of packet being ACK'd */
 607         rxrpc_seq_t             ackr_prev_seq;  /* previous sequence number received */
 608         rxrpc_seq_t             ackr_consumed;  /* Highest packet shown consumed */
 609         rxrpc_seq_t             ackr_seen;      /* Highest packet shown seen */
 610
 611         /* ping management */
 612         rxrpc_serial_t          ping_serial;    /* Last ping sent */
 613         ktime_t                 ping_time;      /* Time last ping sent */
 614
 615         /* transmission-phase ACK management */
 616         ktime_t                 acks_latest_ts; /* Timestamp of latest ACK received */
 617         rxrpc_serial_t          acks_latest;    /* serial number of latest ACK received */
 618         rxrpc_seq_t             acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
 619 };
 620
 621 /*
 622  * Summary of a new ACK and the changes it made to the Tx buffer packet states.
 623  */
 624 struct rxrpc_ack_summary {
 625         u8                      ack_reason;
 626         u8                      nr_acks;                /* Number of ACKs in packet */
 627         u8                      nr_nacks;               /* Number of NACKs in packet */
 628         u8                      nr_new_acks;            /* Number of new ACKs in packet */
 629         u8                      nr_new_nacks;           /* Number of new NACKs in packet */
 630         u8                      nr_rot_new_acks;        /* Number of rotated new ACKs */
 631         bool                    new_low_nack;           /* T if new low NACK found */
 632         bool                    retrans_timeo;          /* T if reTx due to timeout happened */
 633         u8                      flight_size;            /* Number of unreceived transmissions */
 634         /* Place to stash values for tracing */
 635         enum rxrpc_congest_mode mode:8;
 636         u8                      cwnd;
 637         u8                      ssthresh;
 638         u8                      dup_acks;
 639         u8                      cumulative_acks;
 640 };
 641
 642 #include <trace/events/rxrpc.h>
 643
 644 /*
 645  * af_rxrpc.c
 646  */
 647 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
 648 extern atomic_t rxrpc_debug_id;
 649 extern struct workqueue_struct *rxrpc_workqueue;
 650
 651 /*
 652  * call_accept.c
 653  */
 654 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
 655 void rxrpc_discard_prealloc(struct rxrpc_sock *);
 656 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
 657                                            struct rxrpc_connection *,
 658                                            struct sk_buff *);
 659 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
 660 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
 661                                      rxrpc_notify_rx_t);
 662 int rxrpc_reject_call(struct rxrpc_sock *);
 663
 664 /*
 665  * call_event.c
 666  */
 667 void __rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t);
 668 void rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t);
 669 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
 670                        enum rxrpc_propose_ack_trace);
 671 void rxrpc_process_call(struct work_struct *);
 672
 673 /*
 674  * call_object.c
 675  */
 676 extern const char *const rxrpc_call_states[];
 677 extern const char *const rxrpc_call_completions[];
 678 extern unsigned int rxrpc_max_call_lifetime;
 679 extern struct kmem_cache *rxrpc_call_jar;
 680
 681 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
 682 struct rxrpc_call *rxrpc_alloc_call(gfp_t);
 683 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
 684                                          struct rxrpc_conn_parameters *,
 685                                          struct sockaddr_rxrpc *,
 686                                          unsigned long, gfp_t);
 687 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
 688                          struct sk_buff *);
 689 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
 690 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 691 bool __rxrpc_queue_call(struct rxrpc_call *);
 692 bool rxrpc_queue_call(struct rxrpc_call *);
 693 void rxrpc_see_call(struct rxrpc_call *);
 694 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
 695 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
 696 void rxrpc_cleanup_call(struct rxrpc_call *);
 697 void rxrpc_destroy_all_calls(struct rxrpc_net *);
 698
 699 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
 700 {
 701         return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
 702 }
 703
 704 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
 705 {
 706         return !rxrpc_is_service_call(call);
 707 }
 708
 709 /*
 710  * Transition a call to the complete state.
 711  */
 712 static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
 713                                                enum rxrpc_call_completion compl,
 714                                                u32 abort_code,
 715                                                int error)
 716 {
 717         if (call->state < RXRPC_CALL_COMPLETE) {
 718                 call->abort_code = abort_code;
 719                 call->error = error;
 720                 call->completion = compl,
 721                 call->state = RXRPC_CALL_COMPLETE;
 722                 wake_up(&call->waitq);
 723                 return true;
 724         }
 725         return false;
 726 }
 727
 728 static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
 729                                              enum rxrpc_call_completion compl,
 730                                              u32 abort_code,
 731                                              int error)
 732 {
 733         bool ret;
 734
 735         write_lock_bh(&call->state_lock);
 736         ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
 737         write_unlock_bh(&call->state_lock);
 738         return ret;
 739 }
 740
 741 /*
 742  * Record that a call successfully completed.
 743  */
 744 static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
 745 {
 746         return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
 747 }
 748
 749 static inline bool rxrpc_call_completed(struct rxrpc_call *call)
 750 {
 751         bool ret;
 752
 753         write_lock_bh(&call->state_lock);
 754         ret = __rxrpc_call_completed(call);
 755         write_unlock_bh(&call->state_lock);
 756         return ret;
 757 }
 758
 759 /*
 760  * Record that a call is locally aborted.
 761  */
 762 static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 763                                       rxrpc_seq_t seq,
 764                                       u32 abort_code, int error)
 765 {
 766         trace_rxrpc_abort(why, call->cid, call->call_id, seq,
 767                           abort_code, error);
 768         return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
 769                                            abort_code, error);
 770 }
 771
 772 static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 773                                     rxrpc_seq_t seq, u32 abort_code, int error)
 774 {
 775         bool ret;
 776
 777         write_lock_bh(&call->state_lock);
 778         ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
 779         write_unlock_bh(&call->state_lock);
 780         return ret;
 781 }
 782
 783 /*
 784  * Abort a call due to a protocol error.
 785  */
 786 static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
 787                                         struct sk_buff *skb,
 788                                         const char *eproto_why,
 789                                         const char *why,
 790                                         u32 abort_code)
 791 {
 792         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 793
 794         trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
 795         return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
 796 }
 797
 798 #define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
 799         __rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
 800                              (abort_why), (abort_code))
 801
 802 /*
 803  * conn_client.c
 804  */
 805 extern unsigned int rxrpc_max_client_connections;
 806 extern unsigned int rxrpc_reap_client_connections;
 807 extern unsigned int rxrpc_conn_idle_client_expiry;
 808 extern unsigned int rxrpc_conn_idle_client_fast_expiry;
 809 extern struct idr rxrpc_client_conn_ids;
 810
 811 void rxrpc_destroy_client_conn_ids(void);
 812 int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *,
 813                        struct sockaddr_rxrpc *, gfp_t);
 814 void rxrpc_expose_client_call(struct rxrpc_call *);
 815 void rxrpc_disconnect_client_call(struct rxrpc_call *);
 816 void rxrpc_put_client_conn(struct rxrpc_connection *);
 817 void rxrpc_discard_expired_client_conns(struct work_struct *);
 818 void rxrpc_destroy_all_client_connections(struct rxrpc_net *);
 819
 820 /*
 821  * conn_event.c
 822  */
 823 void rxrpc_process_connection(struct work_struct *);
 824
 825 /*
 826  * conn_object.c
 827  */
 828 extern unsigned int rxrpc_connection_expiry;
 829
 830 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
 831 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
 832 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
 833                                                    struct sk_buff *);
 834 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
 835 void rxrpc_disconnect_call(struct rxrpc_call *);
 836 void rxrpc_kill_connection(struct rxrpc_connection *);
 837 bool rxrpc_queue_conn(struct rxrpc_connection *);
 838 void rxrpc_see_connection(struct rxrpc_connection *);
 839 void rxrpc_get_connection(struct rxrpc_connection *);
 840 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
 841 void rxrpc_put_service_conn(struct rxrpc_connection *);
 842 void rxrpc_service_connection_reaper(struct work_struct *);
 843 void rxrpc_destroy_all_connections(struct rxrpc_net *);
 844
 845 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
 846 {
 847         return conn->out_clientflag;
 848 }
 849
 850 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
 851 {
 852         return !rxrpc_conn_is_client(conn);
 853 }
 854
 855 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
 856 {
 857         if (!conn)
 858                 return;
 859
 860         if (rxrpc_conn_is_client(conn))
 861                 rxrpc_put_client_conn(conn);
 862         else
 863                 rxrpc_put_service_conn(conn);
 864 }
 865
 866 /*
 867  * conn_service.c
 868  */
 869 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
 870                                                      struct sk_buff *);
 871 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
 872 void rxrpc_new_incoming_connection(struct rxrpc_sock *,
 873                                    struct rxrpc_connection *, struct sk_buff *);
 874 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
 875
 876 /*
 877  * input.c
 878  */
 879 void rxrpc_data_ready(struct sock *);
 880
 881 /*
 882  * insecure.c
 883  */
 884 extern const struct rxrpc_security rxrpc_no_security;
 885
 886 /*
 887  * key.c
 888  */
 889 extern struct key_type key_type_rxrpc;
 890 extern struct key_type key_type_rxrpc_s;
 891
 892 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
 893 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
 894 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time_t,
 895                               u32);
 896
 897 /*
 898  * local_event.c
 899  */
 900 extern void rxrpc_process_local_events(struct rxrpc_local *);
 901
 902 /*
 903  * local_object.c
 904  */
 905 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
 906 void __rxrpc_put_local(struct rxrpc_local *);
 907 void rxrpc_destroy_all_locals(struct rxrpc_net *);
 908
 909 static inline void rxrpc_get_local(struct rxrpc_local *local)
 910 {
 911         atomic_inc(&local->usage);
 912 }
 913
 914 static inline
 915 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local)
 916 {
 917         return atomic_inc_not_zero(&local->usage) ? local : NULL;
 918 }
 919
 920 static inline void rxrpc_put_local(struct rxrpc_local *local)
 921 {
 922         if (local && atomic_dec_and_test(&local->usage))
 923                 __rxrpc_put_local(local);
 924 }
 925
 926 static inline void rxrpc_queue_local(struct rxrpc_local *local)
 927 {
 928         rxrpc_queue_work(&local->processor);
 929 }
 930
 931 /*
 932  * misc.c
 933  */
 934 extern unsigned int rxrpc_max_backlog __read_mostly;
 935 extern unsigned int rxrpc_requested_ack_delay;
 936 extern unsigned int rxrpc_soft_ack_delay;
 937 extern unsigned int rxrpc_idle_ack_delay;
 938 extern unsigned int rxrpc_rx_window_size;
 939 extern unsigned int rxrpc_rx_mtu;
 940 extern unsigned int rxrpc_rx_jumbo_max;
 941 extern unsigned int rxrpc_resend_timeout;
 942
 943 extern const s8 rxrpc_ack_priority[];
 944
 945 /*
 946  * net_ns.c
 947  */
 948 extern unsigned int rxrpc_net_id;
 949 extern struct pernet_operations rxrpc_net_ops;
 950
 951 static inline struct rxrpc_net *rxrpc_net(struct net *net)
 952 {
 953         return net_generic(net, rxrpc_net_id);
 954 }
 955
 956 /*
 957  * output.c
 958  */
 959 int rxrpc_send_ack_packet(struct rxrpc_call *, bool);
 960 int rxrpc_send_abort_packet(struct rxrpc_call *);
 961 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
 962 void rxrpc_reject_packets(struct rxrpc_local *);
 963
 964 /*
 965  * peer_event.c
 966  */
 967 void rxrpc_error_report(struct sock *);
 968 void rxrpc_peer_error_distributor(struct work_struct *);
 969 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
 970                         rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
 971
 972 /*
 973  * peer_object.c
 974  */
 975 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
 976                                          const struct sockaddr_rxrpc *);
 977 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *,
 978                                      struct sockaddr_rxrpc *, gfp_t);
 979 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
 980 struct rxrpc_peer *rxrpc_lookup_incoming_peer(struct rxrpc_local *,
 981                                               struct rxrpc_peer *);
 982
 983 static inline struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer)
 984 {
 985         atomic_inc(&peer->usage);
 986         return peer;
 987 }
 988
 989 static inline
 990 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer)
 991 {
 992         return atomic_inc_not_zero(&peer->usage) ? peer : NULL;
 993 }
 994
 995 extern void __rxrpc_put_peer(struct rxrpc_peer *peer);
 996 static inline void rxrpc_put_peer(struct rxrpc_peer *peer)
 997 {
 998         if (peer && atomic_dec_and_test(&peer->usage))
 999                 __rxrpc_put_peer(peer);
1000 }
1001
1002 /*
1003  * proc.c
1004  */
1005 extern const struct file_operations rxrpc_call_seq_fops;
1006 extern const struct file_operations rxrpc_connection_seq_fops;
1007
1008 /*
1009  * recvmsg.c
1010  */
1011 void rxrpc_notify_socket(struct rxrpc_call *);
1012 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1013
1014 /*
1015  * rxkad.c
1016  */
1017 #ifdef CONFIG_RXKAD
1018 extern const struct rxrpc_security rxkad;
1019 #endif
1020
1021 /*
1022  * security.c
1023  */
1024 int __init rxrpc_init_security(void);
1025 void rxrpc_exit_security(void);
1026 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1027 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
1028
1029 /*
1030  * sendmsg.c
1031  */
1032 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1033
1034 /*
1035  * skbuff.c
1036  */
1037 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1038 void rxrpc_packet_destructor(struct sk_buff *);
1039 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1040 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1041 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1042 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1043 void rxrpc_lose_skb(struct sk_buff *, enum rxrpc_skb_trace);
1044 void rxrpc_purge_queue(struct sk_buff_head *);
1045
1046 /*
1047  * sysctl.c
1048  */
1049 #ifdef CONFIG_SYSCTL
1050 extern int __init rxrpc_sysctl_init(void);
1051 extern void rxrpc_sysctl_exit(void);
1052 #else
1053 static inline int __init rxrpc_sysctl_init(void) { return 0; }
1054 static inline void rxrpc_sysctl_exit(void) {}
1055 #endif
1056
1057 /*
1058  * utils.c
1059  */
1060 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1061
1062 static inline bool before(u32 seq1, u32 seq2)
1063 {
1064         return (s32)(seq1 - seq2) < 0;
1065 }
1066 static inline bool before_eq(u32 seq1, u32 seq2)
1067 {
1068         return (s32)(seq1 - seq2) <= 0;
1069 }
1070 static inline bool after(u32 seq1, u32 seq2)
1071 {
1072         return (s32)(seq1 - seq2) > 0;
1073 }
1074 static inline bool after_eq(u32 seq1, u32 seq2)
1075 {
1076         return (s32)(seq1 - seq2) >= 0;
1077 }
1078
1079 /*
1080  * debug tracing
1081  */
1082 extern unsigned int rxrpc_debug;
1083
1084 #define dbgprintk(FMT,...) \
1085         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1086
1087 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1088 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1089 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
1090 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
1091 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1092
1093
1094 #if defined(__KDEBUG)
1095 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1096 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1097 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1098 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
1099 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
1100
1101 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1102 #define RXRPC_DEBUG_KENTER      0x01
1103 #define RXRPC_DEBUG_KLEAVE      0x02
1104 #define RXRPC_DEBUG_KDEBUG      0x04
1105 #define RXRPC_DEBUG_KPROTO      0x08
1106 #define RXRPC_DEBUG_KNET        0x10
1107
1108 #define _enter(FMT,...)                                 \
1109 do {                                                    \
1110         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1111                 kenter(FMT,##__VA_ARGS__);              \
1112 } while (0)
1113
1114 #define _leave(FMT,...)                                 \
1115 do {                                                    \
1116         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1117                 kleave(FMT,##__VA_ARGS__);              \
1118 } while (0)
1119
1120 #define _debug(FMT,...)                                 \
1121 do {                                                    \
1122         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1123                 kdebug(FMT,##__VA_ARGS__);              \
1124 } while (0)
1125
1126 #define _proto(FMT,...)                                 \
1127 do {                                                    \
1128         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
1129                 kproto(FMT,##__VA_ARGS__);              \
1130 } while (0)
1131
1132 #define _net(FMT,...)                                   \
1133 do {                                                    \
1134         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
1135                 knet(FMT,##__VA_ARGS__);                \
1136 } while (0)
1137
1138 #else
1139 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1140 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1141 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
1142 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
1143 #define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
1144 #endif
1145
1146 /*
1147  * debug assertion checking
1148  */
1149 #if 1 // defined(__KDEBUGALL)
1150
1151 #define ASSERT(X)                                               \
1152 do {                                                            \
1153         if (unlikely(!(X))) {                                   \
1154                 pr_err("Assertion failed\n");                   \
1155                 BUG();                                          \
1156         }                                                       \
1157 } while (0)
1158
1159 #define ASSERTCMP(X, OP, Y)                                             \
1160 do {                                                                    \
1161         __typeof__(X) _x = (X);                                         \
1162         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1163         if (unlikely(!(_x OP _y))) {                                    \
1164                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1165                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1166                        (unsigned long)_y, (unsigned long)_y);           \
1167                 BUG();                                                  \
1168         }                                                               \
1169 } while (0)
1170
1171 #define ASSERTIF(C, X)                                          \
1172 do {                                                            \
1173         if (unlikely((C) && !(X))) {                            \
1174                 pr_err("Assertion failed\n");                   \
1175                 BUG();                                          \
1176         }                                                       \
1177 } while (0)
1178
1179 #define ASSERTIFCMP(C, X, OP, Y)                                        \
1180 do {                                                                    \
1181         __typeof__(X) _x = (X);                                         \
1182         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1183         if (unlikely((C) && !(_x OP _y))) {                             \
1184                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1185                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1186                        (unsigned long)_y, (unsigned long)_y);           \
1187                 BUG();                                                  \
1188         }                                                               \
1189 } while (0)
1190
1191 #else
1192
1193 #define ASSERT(X)                               \
1194 do {                                            \
1195 } while (0)
1196
1197 #define ASSERTCMP(X, OP, Y)                     \
1198 do {                                            \
1199 } while (0)
1200
1201 #define ASSERTIF(C, X)                          \
1202 do {                                            \
1203 } while (0)
1204
1205 #define ASSERTIFCMP(C, X, OP, Y)                \
1206 do {                                            \
1207 } while (0)
1208
1209 #endif /* __KDEBUGALL */