net/rxrpc/ar-internal.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* AF_RXRPC internal definitions
   3  *
   4  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   5  * Written by David Howells (dhowells@redhat.com)
   6  */
   7
   8 #include <linux/atomic.h>
   9 #include <linux/seqlock.h>
  10 #include <net/net_namespace.h>
  11 #include <net/netns/generic.h>
  12 #include <net/sock.h>
  13 #include <net/af_rxrpc.h>
  14 #include "protocol.h"
  15
  16 #if 0
  17 #define CHECK_SLAB_OKAY(X)                                   \
  18         BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
  19                (POISON_FREE << 8 | POISON_FREE))
  20 #else
  21 #define CHECK_SLAB_OKAY(X) do {} while (0)
  22 #endif
  23
  24 #define FCRYPT_BSIZE 8
  25 struct rxrpc_crypt {
  26         union {
  27                 u8      x[FCRYPT_BSIZE];
  28                 __be32  n[2];
  29         };
  30 } __attribute__((aligned(8)));
  31
  32 #define rxrpc_queue_work(WS)    queue_work(rxrpc_workqueue, (WS))
  33 #define rxrpc_queue_delayed_work(WS,D)  \
  34         queue_delayed_work(rxrpc_workqueue, (WS), (D))
  35
  36 struct rxrpc_connection;
  37
  38 /*
  39  * Mark applied to socket buffers in skb->mark.  skb->priority is used
  40  * to pass supplementary information.
  41  */
  42 enum rxrpc_skb_mark {
  43         RXRPC_SKB_MARK_REJECT_BUSY,     /* Reject with BUSY */
  44         RXRPC_SKB_MARK_REJECT_ABORT,    /* Reject with ABORT (code in skb->priority) */
  45 };
  46
  47 /*
  48  * sk_state for RxRPC sockets
  49  */
  50 enum {
  51         RXRPC_UNBOUND = 0,
  52         RXRPC_CLIENT_UNBOUND,           /* Unbound socket used as client */
  53         RXRPC_CLIENT_BOUND,             /* client local address bound */
  54         RXRPC_SERVER_BOUND,             /* server local address bound */
  55         RXRPC_SERVER_BOUND2,            /* second server local address bound */
  56         RXRPC_SERVER_LISTENING,         /* server listening for connections */
  57         RXRPC_SERVER_LISTEN_DISABLED,   /* server listening disabled */
  58         RXRPC_CLOSE,                    /* socket is being closed */
  59 };
  60
  61 /*
  62  * Per-network namespace data.
  63  */
  64 struct rxrpc_net {
  65         struct proc_dir_entry   *proc_net;      /* Subdir in /proc/net */
  66         u32                     epoch;          /* Local epoch for detecting local-end reset */
  67         struct list_head        calls;          /* List of calls active in this namespace */
  68         rwlock_t                call_lock;      /* Lock for ->calls */
  69         atomic_t                nr_calls;       /* Count of allocated calls */
  70
  71         atomic_t                nr_conns;
  72         struct list_head        conn_proc_list; /* List of conns in this namespace for proc */
  73         struct list_head        service_conns;  /* Service conns in this namespace */
  74         rwlock_t                conn_lock;      /* Lock for ->conn_proc_list, ->service_conns */
  75         struct work_struct      service_conn_reaper;
  76         struct timer_list       service_conn_reap_timer;
  77
  78         unsigned int            nr_client_conns;
  79         unsigned int            nr_active_client_conns;
  80         bool                    kill_all_client_conns;
  81         bool                    live;
  82         spinlock_t              client_conn_cache_lock; /* Lock for ->*_client_conns */
  83         spinlock_t              client_conn_discard_lock; /* Prevent multiple discarders */
  84         struct list_head        waiting_client_conns;
  85         struct list_head        active_client_conns;
  86         struct list_head        idle_client_conns;
  87         struct work_struct      client_conn_reaper;
  88         struct timer_list       client_conn_reap_timer;
  89
  90         struct list_head        local_endpoints;
  91         struct mutex            local_mutex;    /* Lock for ->local_endpoints */
  92
  93         DECLARE_HASHTABLE       (peer_hash, 10);
  94         spinlock_t              peer_hash_lock; /* Lock for ->peer_hash */
  95
  96 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
  97         u8                      peer_keepalive_cursor;
  98         time64_t                peer_keepalive_base;
  99         struct list_head        peer_keepalive[32];
 100         struct list_head        peer_keepalive_new;
 101         struct timer_list       peer_keepalive_timer;
 102         struct work_struct      peer_keepalive_work;
 103 };
 104
 105 /*
 106  * Service backlog preallocation.
 107  *
 108  * This contains circular buffers of preallocated peers, connections and calls
 109  * for incoming service calls and their head and tail pointers.  This allows
 110  * calls to be set up in the data_ready handler, thereby avoiding the need to
 111  * shuffle packets around so much.
 112  */
 113 struct rxrpc_backlog {
 114         unsigned short          peer_backlog_head;
 115         unsigned short          peer_backlog_tail;
 116         unsigned short          conn_backlog_head;
 117         unsigned short          conn_backlog_tail;
 118         unsigned short          call_backlog_head;
 119         unsigned short          call_backlog_tail;
 120 #define RXRPC_BACKLOG_MAX       32
 121         struct rxrpc_peer       *peer_backlog[RXRPC_BACKLOG_MAX];
 122         struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
 123         struct rxrpc_call       *call_backlog[RXRPC_BACKLOG_MAX];
 124 };
 125
 126 /*
 127  * RxRPC socket definition
 128  */
 129 struct rxrpc_sock {
 130         /* WARNING: sk has to be the first member */
 131         struct sock             sk;
 132         rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
 133         rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
 134         struct rxrpc_local      *local;         /* local endpoint */
 135         struct rxrpc_backlog    *backlog;       /* Preallocation for services */
 136         spinlock_t              incoming_lock;  /* Incoming call vs service shutdown lock */
 137         struct list_head        sock_calls;     /* List of calls owned by this socket */
 138         struct list_head        to_be_accepted; /* calls awaiting acceptance */
 139         struct list_head        recvmsg_q;      /* Calls awaiting recvmsg's attention  */
 140         rwlock_t                recvmsg_lock;   /* Lock for recvmsg_q */
 141         struct key              *key;           /* security for this socket */
 142         struct key              *securities;    /* list of server security descriptors */
 143         struct rb_root          calls;          /* User ID -> call mapping */
 144         unsigned long           flags;
 145 #define RXRPC_SOCK_CONNECTED            0       /* connect_srx is set */
 146         rwlock_t                call_lock;      /* lock for calls */
 147         u32                     min_sec_level;  /* minimum security level */
 148 #define RXRPC_SECURITY_MAX      RXRPC_SECURITY_ENCRYPT
 149         bool                    exclusive;      /* Exclusive connection for a client socket */
 150         u16                     second_service; /* Additional service bound to the endpoint */
 151         struct {
 152                 /* Service upgrade information */
 153                 u16             from;           /* Service ID to upgrade (if not 0) */
 154                 u16             to;             /* service ID to upgrade to */
 155         } service_upgrade;
 156         sa_family_t             family;         /* Protocol family created with */
 157         struct sockaddr_rxrpc   srx;            /* Primary Service/local addresses */
 158         struct sockaddr_rxrpc   connect_srx;    /* Default client address from connect() */
 159 };
 160
 161 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
 162
 163 /*
 164  * CPU-byteorder normalised Rx packet header.
 165  */
 166 struct rxrpc_host_header {
 167         u32             epoch;          /* client boot timestamp */
 168         u32             cid;            /* connection and channel ID */
 169         u32             callNumber;     /* call ID (0 for connection-level packets) */
 170         u32             seq;            /* sequence number of pkt in call stream */
 171         u32             serial;         /* serial number of pkt sent to network */
 172         u8              type;           /* packet type */
 173         u8              flags;          /* packet flags */
 174         u8              userStatus;     /* app-layer defined status */
 175         u8              securityIndex;  /* security protocol ID */
 176         union {
 177                 u16     _rsvd;          /* reserved */
 178                 u16     cksum;          /* kerberos security checksum */
 179         };
 180         u16             serviceId;      /* service ID */
 181 } __packed;
 182
 183 /*
 184  * RxRPC socket buffer private variables
 185  * - max 48 bytes (struct sk_buff::cb)
 186  */
 187 struct rxrpc_skb_priv {
 188         union {
 189                 u8              nr_jumbo;       /* Number of jumbo subpackets */
 190         };
 191         union {
 192                 int             remain;         /* amount of space remaining for next write */
 193         };
 194
 195         struct rxrpc_host_header hdr;           /* RxRPC packet header from this packet */
 196 };
 197
 198 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
 199
 200 /*
 201  * RxRPC security module interface
 202  */
 203 struct rxrpc_security {
 204         const char              *name;          /* name of this service */
 205         u8                      security_index; /* security type provided */
 206
 207         /* Initialise a security service */
 208         int (*init)(void);
 209
 210         /* Clean up a security service */
 211         void (*exit)(void);
 212
 213         /* initialise a connection's security */
 214         int (*init_connection_security)(struct rxrpc_connection *);
 215
 216         /* prime a connection's packet security */
 217         int (*prime_packet_security)(struct rxrpc_connection *);
 218
 219         /* impose security on a packet */
 220         int (*secure_packet)(struct rxrpc_call *,
 221                              struct sk_buff *,
 222                              size_t,
 223                              void *);
 224
 225         /* verify the security on a received packet */
 226         int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
 227                              unsigned int, unsigned int, rxrpc_seq_t, u16);
 228
 229         /* Locate the data in a received packet that has been verified. */
 230         void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
 231                             unsigned int *, unsigned int *);
 232
 233         /* issue a challenge */
 234         int (*issue_challenge)(struct rxrpc_connection *);
 235
 236         /* respond to a challenge */
 237         int (*respond_to_challenge)(struct rxrpc_connection *,
 238                                     struct sk_buff *,
 239                                     u32 *);
 240
 241         /* verify a response */
 242         int (*verify_response)(struct rxrpc_connection *,
 243                                struct sk_buff *,
 244                                u32 *);
 245
 246         /* clear connection security */
 247         void (*clear)(struct rxrpc_connection *);
 248 };
 249
 250 /*
 251  * RxRPC local transport endpoint description
 252  * - owned by a single AF_RXRPC socket
 253  * - pointed to by transport socket struct sk_user_data
 254  */
 255 struct rxrpc_local {
 256         struct rcu_head         rcu;
 257         atomic_t                usage;
 258         struct rxrpc_net        *rxnet;         /* The network ns in which this resides */
 259         struct list_head        link;
 260         struct socket           *socket;        /* my UDP socket */
 261         struct work_struct      processor;
 262         struct rxrpc_sock __rcu *service;       /* Service(s) listening on this endpoint */
 263         struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
 264         struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
 265         struct sk_buff_head     event_queue;    /* endpoint event packets awaiting processing */
 266         struct rb_root          client_conns;   /* Client connections by socket params */
 267         spinlock_t              client_conns_lock; /* Lock for client_conns */
 268         spinlock_t              lock;           /* access lock */
 269         rwlock_t                services_lock;  /* lock for services list */
 270         int                     debug_id;       /* debug ID for printks */
 271         bool                    dead;
 272         bool                    service_closed; /* Service socket closed */
 273         struct sockaddr_rxrpc   srx;            /* local address */
 274 };
 275
 276 /*
 277  * RxRPC remote transport endpoint definition
 278  * - matched by local endpoint, remote port, address and protocol type
 279  */
 280 struct rxrpc_peer {
 281         struct rcu_head         rcu;            /* This must be first */
 282         atomic_t                usage;
 283         unsigned long           hash_key;
 284         struct hlist_node       hash_link;
 285         struct rxrpc_local      *local;
 286         struct hlist_head       error_targets;  /* targets for net error distribution */
 287         struct rb_root          service_conns;  /* Service connections */
 288         struct list_head        keepalive_link; /* Link in net->peer_keepalive[] */
 289         time64_t                last_tx_at;     /* Last time packet sent here */
 290         seqlock_t               service_conn_lock;
 291         spinlock_t              lock;           /* access lock */
 292         unsigned int            if_mtu;         /* interface MTU for this peer */
 293         unsigned int            mtu;            /* network MTU for this peer */
 294         unsigned int            maxdata;        /* data size (MTU - hdrsize) */
 295         unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
 296         int                     debug_id;       /* debug ID for printks */
 297         struct sockaddr_rxrpc   srx;            /* remote address */
 298
 299         /* calculated RTT cache */
 300 #define RXRPC_RTT_CACHE_SIZE 32
 301         spinlock_t              rtt_input_lock; /* RTT lock for input routine */
 302         ktime_t                 rtt_last_req;   /* Time of last RTT request */
 303         u64                     rtt;            /* Current RTT estimate (in nS) */
 304         u64                     rtt_sum;        /* Sum of cache contents */
 305         u64                     rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */
 306         u8                      rtt_cursor;     /* next entry at which to insert */
 307         u8                      rtt_usage;      /* amount of cache actually used */
 308
 309         u8                      cong_cwnd;      /* Congestion window size */
 310 };
 311
 312 /*
 313  * Keys for matching a connection.
 314  */
 315 struct rxrpc_conn_proto {
 316         union {
 317                 struct {
 318                         u32     epoch;          /* epoch of this connection */
 319                         u32     cid;            /* connection ID */
 320                 };
 321                 u64             index_key;
 322         };
 323 };
 324
 325 struct rxrpc_conn_parameters {
 326         struct rxrpc_local      *local;         /* Representation of local endpoint */
 327         struct rxrpc_peer       *peer;          /* Remote endpoint */
 328         struct key              *key;           /* Security details */
 329         bool                    exclusive;      /* T if conn is exclusive */
 330         bool                    upgrade;        /* T if service ID can be upgraded */
 331         u16                     service_id;     /* Service ID for this connection */
 332         u32                     security_level; /* Security level selected */
 333 };
 334
 335 /*
 336  * Bits in the connection flags.
 337  */
 338 enum rxrpc_conn_flag {
 339         RXRPC_CONN_HAS_IDR,             /* Has a client conn ID assigned */
 340         RXRPC_CONN_IN_SERVICE_CONNS,    /* Conn is in peer->service_conns */
 341         RXRPC_CONN_IN_CLIENT_CONNS,     /* Conn is in local->client_conns */
 342         RXRPC_CONN_EXPOSED,             /* Conn has extra ref for exposure */
 343         RXRPC_CONN_DONT_REUSE,          /* Don't reuse this connection */
 344         RXRPC_CONN_COUNTED,             /* Counted by rxrpc_nr_client_conns */
 345         RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */
 346         RXRPC_CONN_FINAL_ACK_0,         /* Need final ACK for channel 0 */
 347         RXRPC_CONN_FINAL_ACK_1,         /* Need final ACK for channel 1 */
 348         RXRPC_CONN_FINAL_ACK_2,         /* Need final ACK for channel 2 */
 349         RXRPC_CONN_FINAL_ACK_3,         /* Need final ACK for channel 3 */
 350 };
 351
 352 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) |    \
 353                                    (1UL << RXRPC_CONN_FINAL_ACK_1) |    \
 354                                    (1UL << RXRPC_CONN_FINAL_ACK_2) |    \
 355                                    (1UL << RXRPC_CONN_FINAL_ACK_3))
 356
 357 /*
 358  * Events that can be raised upon a connection.
 359  */
 360 enum rxrpc_conn_event {
 361         RXRPC_CONN_EV_CHALLENGE,        /* Send challenge packet */
 362 };
 363
 364 /*
 365  * The connection cache state.
 366  */
 367 enum rxrpc_conn_cache_state {
 368         RXRPC_CONN_CLIENT_INACTIVE,     /* Conn is not yet listed */
 369         RXRPC_CONN_CLIENT_WAITING,      /* Conn is on wait list, waiting for capacity */
 370         RXRPC_CONN_CLIENT_ACTIVE,       /* Conn is on active list, doing calls */
 371         RXRPC_CONN_CLIENT_UPGRADE,      /* Conn is on active list, probing for upgrade */
 372         RXRPC_CONN_CLIENT_CULLED,       /* Conn is culled and delisted, doing calls */
 373         RXRPC_CONN_CLIENT_IDLE,         /* Conn is on idle list, doing mostly nothing */
 374         RXRPC_CONN__NR_CACHE_STATES
 375 };
 376
 377 /*
 378  * The connection protocol state.
 379  */
 380 enum rxrpc_conn_proto_state {
 381         RXRPC_CONN_UNUSED,              /* Connection not yet attempted */
 382         RXRPC_CONN_CLIENT,              /* Client connection */
 383         RXRPC_CONN_SERVICE_PREALLOC,    /* Service connection preallocation */
 384         RXRPC_CONN_SERVICE_UNSECURED,   /* Service unsecured connection */
 385         RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
 386         RXRPC_CONN_SERVICE,             /* Service secured connection */
 387         RXRPC_CONN_REMOTELY_ABORTED,    /* Conn aborted by peer */
 388         RXRPC_CONN_LOCALLY_ABORTED,     /* Conn aborted locally */
 389         RXRPC_CONN__NR_STATES
 390 };
 391
 392 /*
 393  * RxRPC connection definition
 394  * - matched by { local, peer, epoch, conn_id, direction }
 395  * - each connection can only handle four simultaneous calls
 396  */
 397 struct rxrpc_connection {
 398         struct rxrpc_conn_proto proto;
 399         struct rxrpc_conn_parameters params;
 400
 401         atomic_t                usage;
 402         struct rcu_head         rcu;
 403         struct list_head        cache_link;
 404
 405         spinlock_t              channel_lock;
 406         unsigned char           active_chans;   /* Mask of active channels */
 407 #define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1)
 408         struct list_head        waiting_calls;  /* Calls waiting for channels */
 409         struct rxrpc_channel {
 410                 unsigned long           final_ack_at;   /* Time at which to issue final ACK */
 411                 struct rxrpc_call __rcu *call;          /* Active call */
 412                 unsigned int            call_debug_id;  /* call->debug_id */
 413                 u32                     call_id;        /* ID of current call */
 414                 u32                     call_counter;   /* Call ID counter */
 415                 u32                     last_call;      /* ID of last call */
 416                 u8                      last_type;      /* Type of last packet */
 417                 union {
 418                         u32             last_seq;
 419                         u32             last_abort;
 420                 };
 421         } channels[RXRPC_MAXCALLS];
 422
 423         struct timer_list       timer;          /* Conn event timer */
 424         struct work_struct      processor;      /* connection event processor */
 425         union {
 426                 struct rb_node  client_node;    /* Node in local->client_conns */
 427                 struct rb_node  service_node;   /* Node in peer->service_conns */
 428         };
 429         struct list_head        proc_link;      /* link in procfs list */
 430         struct list_head        link;           /* link in master connection list */
 431         struct sk_buff_head     rx_queue;       /* received conn-level packets */
 432         const struct rxrpc_security *security;  /* applied security module */
 433         struct key              *server_key;    /* security for this service */
 434         struct crypto_sync_skcipher *cipher;    /* encryption handle */
 435         struct rxrpc_crypt      csum_iv;        /* packet checksum base */
 436         unsigned long           flags;
 437         unsigned long           events;
 438         unsigned long           idle_timestamp; /* Time at which last became idle */
 439         spinlock_t              state_lock;     /* state-change lock */
 440         enum rxrpc_conn_cache_state cache_state;
 441         enum rxrpc_conn_proto_state state;      /* current state of connection */
 442         u32                     abort_code;     /* Abort code of connection abort */
 443         int                     debug_id;       /* debug ID for printks */
 444         atomic_t                serial;         /* packet serial number counter */
 445         unsigned int            hi_serial;      /* highest serial number received */
 446         u32                     security_nonce; /* response re-use preventer */
 447         u32                     service_id;     /* Service ID, possibly upgraded */
 448         u8                      size_align;     /* data size alignment (for security) */
 449         u8                      security_size;  /* security header size */
 450         u8                      security_ix;    /* security type */
 451         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
 452         short                   error;          /* Local error code */
 453 };
 454
 455 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
 456 {
 457         return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
 458 }
 459
 460 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
 461 {
 462         return !rxrpc_to_server(sp);
 463 }
 464
 465 /*
 466  * Flags in call->flags.
 467  */
 468 enum rxrpc_call_flag {
 469         RXRPC_CALL_RELEASED,            /* call has been released - no more message to userspace */
 470         RXRPC_CALL_HAS_USERID,          /* has a user ID attached */
 471         RXRPC_CALL_IS_SERVICE,          /* Call is service call */
 472         RXRPC_CALL_EXPOSED,             /* The call was exposed to the world */
 473         RXRPC_CALL_RX_LAST,             /* Received the last packet (at rxtx_top) */
 474         RXRPC_CALL_TX_LAST,             /* Last packet in Tx buffer (at rxtx_top) */
 475         RXRPC_CALL_SEND_PING,           /* A ping will need to be sent */
 476         RXRPC_CALL_PINGING,             /* Ping in process */
 477         RXRPC_CALL_RETRANS_TIMEOUT,     /* Retransmission due to timeout occurred */
 478         RXRPC_CALL_BEGAN_RX_TIMER,      /* We began the expect_rx_by timer */
 479         RXRPC_CALL_RX_HEARD,            /* The peer responded at least once to this call */
 480         RXRPC_CALL_RX_UNDERRUN,         /* Got data underrun */
 481         RXRPC_CALL_IS_INTR,             /* The call is interruptible */
 482 };
 483
 484 /*
 485  * Events that can be raised on a call.
 486  */
 487 enum rxrpc_call_event {
 488         RXRPC_CALL_EV_ACK,              /* need to generate ACK */
 489         RXRPC_CALL_EV_ABORT,            /* need to generate abort */
 490         RXRPC_CALL_EV_RESEND,           /* Tx resend required */
 491         RXRPC_CALL_EV_PING,             /* Ping send required */
 492         RXRPC_CALL_EV_EXPIRED,          /* Expiry occurred */
 493         RXRPC_CALL_EV_ACK_LOST,         /* ACK may be lost, send ping */
 494 };
 495
 496 /*
 497  * The states that a call can be in.
 498  */
 499 enum rxrpc_call_state {
 500         RXRPC_CALL_UNINITIALISED,
 501         RXRPC_CALL_CLIENT_AWAIT_CONN,   /* - client waiting for connection to become available */
 502         RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
 503         RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
 504         RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
 505         RXRPC_CALL_SERVER_PREALLOC,     /* - service preallocation */
 506         RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
 507         RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
 508         RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
 509         RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
 510         RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
 511         RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
 512         RXRPC_CALL_COMPLETE,            /* - call complete */
 513         NR__RXRPC_CALL_STATES
 514 };
 515
 516 /*
 517  * Call completion condition (state == RXRPC_CALL_COMPLETE).
 518  */
 519 enum rxrpc_call_completion {
 520         RXRPC_CALL_SUCCEEDED,           /* - Normal termination */
 521         RXRPC_CALL_REMOTELY_ABORTED,    /* - call aborted by peer */
 522         RXRPC_CALL_LOCALLY_ABORTED,     /* - call aborted locally on error or close */
 523         RXRPC_CALL_LOCAL_ERROR,         /* - call failed due to local error */
 524         RXRPC_CALL_NETWORK_ERROR,       /* - call terminated by network error */
 525         NR__RXRPC_CALL_COMPLETIONS
 526 };
 527
 528 /*
 529  * Call Tx congestion management modes.
 530  */
 531 enum rxrpc_congest_mode {
 532         RXRPC_CALL_SLOW_START,
 533         RXRPC_CALL_CONGEST_AVOIDANCE,
 534         RXRPC_CALL_PACKET_LOSS,
 535         RXRPC_CALL_FAST_RETRANSMIT,
 536         NR__RXRPC_CONGEST_MODES
 537 };
 538
 539 /*
 540  * RxRPC call definition
 541  * - matched by { connection, call_id }
 542  */
 543 struct rxrpc_call {
 544         struct rcu_head         rcu;
 545         struct rxrpc_connection *conn;          /* connection carrying call */
 546         struct rxrpc_peer       *peer;          /* Peer record for remote address */
 547         struct rxrpc_sock __rcu *socket;        /* socket responsible */
 548         struct rxrpc_net        *rxnet;         /* Network namespace to which call belongs */
 549         struct mutex            user_mutex;     /* User access mutex */
 550         unsigned long           ack_at;         /* When deferred ACK needs to happen */
 551         unsigned long           ack_lost_at;    /* When ACK is figured as lost */
 552         unsigned long           resend_at;      /* When next resend needs to happen */
 553         unsigned long           ping_at;        /* When next to send a ping */
 554         unsigned long           keepalive_at;   /* When next to send a keepalive ping */
 555         unsigned long           expect_rx_by;   /* When we expect to get a packet by */
 556         unsigned long           expect_req_by;  /* When we expect to get a request DATA packet by */
 557         unsigned long           expect_term_by; /* When we expect call termination by */
 558         u32                     next_rx_timo;   /* Timeout for next Rx packet (jif) */
 559         u32                     next_req_timo;  /* Timeout for next Rx request packet (jif) */
 560         struct timer_list       timer;          /* Combined event timer */
 561         struct work_struct      processor;      /* Event processor */
 562         rxrpc_notify_rx_t       notify_rx;      /* kernel service Rx notification function */
 563         struct list_head        link;           /* link in master call list */
 564         struct list_head        chan_wait_link; /* Link in conn->waiting_calls */
 565         struct hlist_node       error_link;     /* link in error distribution list */
 566         struct list_head        accept_link;    /* Link in rx->acceptq */
 567         struct list_head        recvmsg_link;   /* Link in rx->recvmsg_q */
 568         struct list_head        sock_link;      /* Link in rx->sock_calls */
 569         struct rb_node          sock_node;      /* Node in rx->calls */
 570         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
 571         wait_queue_head_t       waitq;          /* Wait queue for channel or Tx */
 572         s64                     tx_total_len;   /* Total length left to be transmitted (or -1) */
 573         __be32                  crypto_buf[2];  /* Temporary packet crypto buffer */
 574         unsigned long           user_call_ID;   /* user-defined call ID */
 575         unsigned long           flags;
 576         unsigned long           events;
 577         spinlock_t              lock;
 578         spinlock_t              notify_lock;    /* Kernel notification lock */
 579         rwlock_t                state_lock;     /* lock for state transition */
 580         u32                     abort_code;     /* Local/remote abort code */
 581         int                     error;          /* Local error incurred */
 582         enum rxrpc_call_state   state;          /* current state of call */
 583         enum rxrpc_call_completion completion;  /* Call completion condition */
 584         atomic_t                usage;
 585         u16                     service_id;     /* service ID */
 586         u8                      security_ix;    /* Security type */
 587         u32                     call_id;        /* call ID on connection  */
 588         u32                     cid;            /* connection ID plus channel index */
 589         int                     debug_id;       /* debug ID for printks */
 590         unsigned short          rx_pkt_offset;  /* Current recvmsg packet offset */
 591         unsigned short          rx_pkt_len;     /* Current recvmsg packet len */
 592
 593         /* Rx/Tx circular buffer, depending on phase.
 594          *
 595          * In the Rx phase, packets are annotated with 0 or the number of the
 596          * segment of a jumbo packet each buffer refers to.  There can be up to
 597          * 47 segments in a maximum-size UDP packet.
 598          *
 599          * In the Tx phase, packets are annotated with which buffers have been
 600          * acked.
 601          */
 602 #define RXRPC_RXTX_BUFF_SIZE    64
 603 #define RXRPC_RXTX_BUFF_MASK    (RXRPC_RXTX_BUFF_SIZE - 1)
 604 #define RXRPC_INIT_RX_WINDOW_SIZE 63
 605         struct sk_buff          **rxtx_buffer;
 606         u8                      *rxtx_annotations;
 607 #define RXRPC_TX_ANNO_ACK       0
 608 #define RXRPC_TX_ANNO_UNACK     1
 609 #define RXRPC_TX_ANNO_NAK       2
 610 #define RXRPC_TX_ANNO_RETRANS   3
 611 #define RXRPC_TX_ANNO_MASK      0x03
 612 #define RXRPC_TX_ANNO_LAST      0x04
 613 #define RXRPC_TX_ANNO_RESENT    0x08
 614
 615 #define RXRPC_RX_ANNO_JUMBO     0x3f            /* Jumbo subpacket number + 1 if not zero */
 616 #define RXRPC_RX_ANNO_JLAST     0x40            /* Set if last element of a jumbo packet */
 617 #define RXRPC_RX_ANNO_VERIFIED  0x80            /* Set if verified and decrypted */
 618         rxrpc_seq_t             tx_hard_ack;    /* Dead slot in buffer; the first transmitted but
 619                                                  * not hard-ACK'd packet follows this.
 620                                                  */
 621         rxrpc_seq_t             tx_top;         /* Highest Tx slot allocated. */
 622         u16                     tx_backoff;     /* Delay to insert due to Tx failure */
 623
 624         /* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
 625          * is fixed, we keep these numbers in terms of segments (ie. DATA
 626          * packets) rather than bytes.
 627          */
 628 #define RXRPC_TX_SMSS           RXRPC_JUMBO_DATALEN
 629         u8                      cong_cwnd;      /* Congestion window size */
 630         u8                      cong_extra;     /* Extra to send for congestion management */
 631         u8                      cong_ssthresh;  /* Slow-start threshold */
 632         enum rxrpc_congest_mode cong_mode:8;    /* Congestion management mode */
 633         u8                      cong_dup_acks;  /* Count of ACKs showing missing packets */
 634         u8                      cong_cumul_acks; /* Cumulative ACK count */
 635         ktime_t                 cong_tstamp;    /* Last time cwnd was changed */
 636
 637         rxrpc_seq_t             rx_hard_ack;    /* Dead slot in buffer; the first received but not
 638                                                  * consumed packet follows this.
 639                                                  */
 640         rxrpc_seq_t             rx_top;         /* Highest Rx slot allocated. */
 641         rxrpc_seq_t             rx_expect_next; /* Expected next packet sequence number */
 642         rxrpc_serial_t          rx_serial;      /* Highest serial received for this call */
 643         u8                      rx_winsize;     /* Size of Rx window */
 644         u8                      tx_winsize;     /* Maximum size of Tx window */
 645         bool                    tx_phase;       /* T if transmission phase, F if receive phase */
 646         u8                      nr_jumbo_bad;   /* Number of jumbo dups/exceeds-windows */
 647
 648         spinlock_t              input_lock;     /* Lock for packet input to this call */
 649
 650         /* receive-phase ACK management */
 651         u8                      ackr_reason;    /* reason to ACK */
 652         u16                     ackr_skew;      /* skew on packet being ACK'd */
 653         rxrpc_serial_t          ackr_serial;    /* serial of packet being ACK'd */
 654         rxrpc_serial_t          ackr_first_seq; /* first sequence number received */
 655         rxrpc_seq_t             ackr_prev_seq;  /* previous sequence number received */
 656         rxrpc_seq_t             ackr_consumed;  /* Highest packet shown consumed */
 657         rxrpc_seq_t             ackr_seen;      /* Highest packet shown seen */
 658
 659         /* ping management */
 660         rxrpc_serial_t          ping_serial;    /* Last ping sent */
 661         ktime_t                 ping_time;      /* Time last ping sent */
 662
 663         /* transmission-phase ACK management */
 664         ktime_t                 acks_latest_ts; /* Timestamp of latest ACK received */
 665         rxrpc_serial_t          acks_latest;    /* serial number of latest ACK received */
 666         rxrpc_seq_t             acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
 667         rxrpc_seq_t             acks_lost_top;  /* tx_top at the time lost-ack ping sent */
 668         rxrpc_serial_t          acks_lost_ping; /* Serial number of probe ACK */
 669 };
 670
 671 /*
 672  * Summary of a new ACK and the changes it made to the Tx buffer packet states.
 673  */
 674 struct rxrpc_ack_summary {
 675         u8                      ack_reason;
 676         u8                      nr_acks;                /* Number of ACKs in packet */
 677         u8                      nr_nacks;               /* Number of NACKs in packet */
 678         u8                      nr_new_acks;            /* Number of new ACKs in packet */
 679         u8                      nr_new_nacks;           /* Number of new NACKs in packet */
 680         u8                      nr_rot_new_acks;        /* Number of rotated new ACKs */
 681         bool                    new_low_nack;           /* T if new low NACK found */
 682         bool                    retrans_timeo;          /* T if reTx due to timeout happened */
 683         u8                      flight_size;            /* Number of unreceived transmissions */
 684         /* Place to stash values for tracing */
 685         enum rxrpc_congest_mode mode:8;
 686         u8                      cwnd;
 687         u8                      ssthresh;
 688         u8                      dup_acks;
 689         u8                      cumulative_acks;
 690 };
 691
 692 /*
 693  * sendmsg() cmsg-specified parameters.
 694  */
 695 enum rxrpc_command {
 696         RXRPC_CMD_SEND_DATA,            /* send data message */
 697         RXRPC_CMD_SEND_ABORT,           /* request abort generation */
 698         RXRPC_CMD_ACCEPT,               /* [server] accept incoming call */
 699         RXRPC_CMD_REJECT_BUSY,          /* [server] reject a call as busy */
 700 };
 701
 702 struct rxrpc_call_params {
 703         s64                     tx_total_len;   /* Total Tx data length (if send data) */
 704         unsigned long           user_call_ID;   /* User's call ID */
 705         struct {
 706                 u32             hard;           /* Maximum lifetime (sec) */
 707                 u32             idle;           /* Max time since last data packet (msec) */
 708                 u32             normal;         /* Max time since last call packet (msec) */
 709         } timeouts;
 710         u8                      nr_timeouts;    /* Number of timeouts specified */
 711         bool                    intr;           /* The call is interruptible */
 712 };
 713
 714 struct rxrpc_send_params {
 715         struct rxrpc_call_params call;
 716         u32                     abort_code;     /* Abort code to Tx (if abort) */
 717         enum rxrpc_command      command : 8;    /* The command to implement */
 718         bool                    exclusive;      /* Shared or exclusive call */
 719         bool                    upgrade;        /* If the connection is upgradeable */
 720 };
 721
 722 #include <trace/events/rxrpc.h>
 723
 724 /*
 725  * af_rxrpc.c
 726  */
 727 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
 728 extern struct workqueue_struct *rxrpc_workqueue;
 729
 730 /*
 731  * call_accept.c
 732  */
 733 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
 734 void rxrpc_discard_prealloc(struct rxrpc_sock *);
 735 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
 736                                            struct rxrpc_sock *,
 737                                            struct sk_buff *);
 738 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
 739 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
 740                                      rxrpc_notify_rx_t);
 741 int rxrpc_reject_call(struct rxrpc_sock *);
 742
 743 /*
 744  * call_event.c
 745  */
 746 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
 747                        enum rxrpc_propose_ack_trace);
 748 void rxrpc_process_call(struct work_struct *);
 749
 750 static inline void rxrpc_reduce_call_timer(struct rxrpc_call *call,
 751                                            unsigned long expire_at,
 752                                            unsigned long now,
 753                                            enum rxrpc_timer_trace why)
 754 {
 755         trace_rxrpc_timer(call, why, now);
 756         timer_reduce(&call->timer, expire_at);
 757 }
 758
 759 /*
 760  * call_object.c
 761  */
 762 extern const char *const rxrpc_call_states[];
 763 extern const char *const rxrpc_call_completions[];
 764 extern unsigned int rxrpc_max_call_lifetime;
 765 extern struct kmem_cache *rxrpc_call_jar;
 766
 767 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
 768 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
 769 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
 770                                          struct rxrpc_conn_parameters *,
 771                                          struct sockaddr_rxrpc *,
 772                                          struct rxrpc_call_params *, gfp_t,
 773                                          unsigned int);
 774 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
 775                          struct sk_buff *);
 776 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
 777 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 778 bool __rxrpc_queue_call(struct rxrpc_call *);
 779 bool rxrpc_queue_call(struct rxrpc_call *);
 780 void rxrpc_see_call(struct rxrpc_call *);
 781 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
 782 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
 783 void rxrpc_cleanup_call(struct rxrpc_call *);
 784 void rxrpc_destroy_all_calls(struct rxrpc_net *);
 785
 786 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
 787 {
 788         return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
 789 }
 790
 791 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
 792 {
 793         return !rxrpc_is_service_call(call);
 794 }
 795
 796 /*
 797  * Transition a call to the complete state.
 798  */
 799 static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
 800                                                enum rxrpc_call_completion compl,
 801                                                u32 abort_code,
 802                                                int error)
 803 {
 804         if (call->state < RXRPC_CALL_COMPLETE) {
 805                 call->abort_code = abort_code;
 806                 call->error = error;
 807                 call->completion = compl,
 808                 call->state = RXRPC_CALL_COMPLETE;
 809                 trace_rxrpc_call_complete(call);
 810                 wake_up(&call->waitq);
 811                 return true;
 812         }
 813         return false;
 814 }
 815
 816 static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
 817                                              enum rxrpc_call_completion compl,
 818                                              u32 abort_code,
 819                                              int error)
 820 {
 821         bool ret;
 822
 823         write_lock_bh(&call->state_lock);
 824         ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
 825         write_unlock_bh(&call->state_lock);
 826         return ret;
 827 }
 828
 829 /*
 830  * Record that a call successfully completed.
 831  */
 832 static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
 833 {
 834         return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
 835 }
 836
 837 static inline bool rxrpc_call_completed(struct rxrpc_call *call)
 838 {
 839         bool ret;
 840
 841         write_lock_bh(&call->state_lock);
 842         ret = __rxrpc_call_completed(call);
 843         write_unlock_bh(&call->state_lock);
 844         return ret;
 845 }
 846
 847 /*
 848  * Record that a call is locally aborted.
 849  */
 850 static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 851                                       rxrpc_seq_t seq,
 852                                       u32 abort_code, int error)
 853 {
 854         trace_rxrpc_abort(call->debug_id, why, call->cid, call->call_id, seq,
 855                           abort_code, error);
 856         return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
 857                                            abort_code, error);
 858 }
 859
 860 static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 861                                     rxrpc_seq_t seq, u32 abort_code, int error)
 862 {
 863         bool ret;
 864
 865         write_lock_bh(&call->state_lock);
 866         ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
 867         write_unlock_bh(&call->state_lock);
 868         return ret;
 869 }
 870
 871 /*
 872  * Abort a call due to a protocol error.
 873  */
 874 static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
 875                                         struct sk_buff *skb,
 876                                         const char *eproto_why,
 877                                         const char *why,
 878                                         u32 abort_code)
 879 {
 880         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 881
 882         trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
 883         return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
 884 }
 885
 886 #define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
 887         __rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
 888                              (abort_why), (abort_code))
 889
 890 /*
 891  * conn_client.c
 892  */
 893 extern unsigned int rxrpc_max_client_connections;
 894 extern unsigned int rxrpc_reap_client_connections;
 895 extern unsigned long rxrpc_conn_idle_client_expiry;
 896 extern unsigned long rxrpc_conn_idle_client_fast_expiry;
 897 extern struct idr rxrpc_client_conn_ids;
 898
 899 void rxrpc_destroy_client_conn_ids(void);
 900 int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_call *,
 901                        struct rxrpc_conn_parameters *, struct sockaddr_rxrpc *,
 902                        gfp_t);
 903 void rxrpc_expose_client_call(struct rxrpc_call *);
 904 void rxrpc_disconnect_client_call(struct rxrpc_call *);
 905 void rxrpc_put_client_conn(struct rxrpc_connection *);
 906 void rxrpc_discard_expired_client_conns(struct work_struct *);
 907 void rxrpc_destroy_all_client_connections(struct rxrpc_net *);
 908
 909 /*
 910  * conn_event.c
 911  */
 912 void rxrpc_process_connection(struct work_struct *);
 913
 914 /*
 915  * conn_object.c
 916  */
 917 extern unsigned int rxrpc_connection_expiry;
 918 extern unsigned int rxrpc_closed_conn_expiry;
 919
 920 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
 921 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
 922                                                    struct sk_buff *,
 923                                                    struct rxrpc_peer **);
 924 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
 925 void rxrpc_disconnect_call(struct rxrpc_call *);
 926 void rxrpc_kill_connection(struct rxrpc_connection *);
 927 bool rxrpc_queue_conn(struct rxrpc_connection *);
 928 void rxrpc_see_connection(struct rxrpc_connection *);
 929 void rxrpc_get_connection(struct rxrpc_connection *);
 930 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
 931 void rxrpc_put_service_conn(struct rxrpc_connection *);
 932 void rxrpc_service_connection_reaper(struct work_struct *);
 933 void rxrpc_destroy_all_connections(struct rxrpc_net *);
 934
 935 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
 936 {
 937         return conn->out_clientflag;
 938 }
 939
 940 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
 941 {
 942         return !rxrpc_conn_is_client(conn);
 943 }
 944
 945 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
 946 {
 947         if (!conn)
 948                 return;
 949
 950         if (rxrpc_conn_is_client(conn))
 951                 rxrpc_put_client_conn(conn);
 952         else
 953                 rxrpc_put_service_conn(conn);
 954 }
 955
 956 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
 957                                            unsigned long expire_at)
 958 {
 959         timer_reduce(&conn->timer, expire_at);
 960 }
 961
 962 /*
 963  * conn_service.c
 964  */
 965 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
 966                                                      struct sk_buff *);
 967 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
 968 void rxrpc_new_incoming_connection(struct rxrpc_sock *,
 969                                    struct rxrpc_connection *, struct sk_buff *);
 970 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
 971
 972 /*
 973  * input.c
 974  */
 975 int rxrpc_input_packet(struct sock *, struct sk_buff *);
 976
 977 /*
 978  * insecure.c
 979  */
 980 extern const struct rxrpc_security rxrpc_no_security;
 981
 982 /*
 983  * key.c
 984  */
 985 extern struct key_type key_type_rxrpc;
 986 extern struct key_type key_type_rxrpc_s;
 987
 988 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
 989 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
 990 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
 991                               u32);
 992
 993 /*
 994  * local_event.c
 995  */
 996 extern void rxrpc_process_local_events(struct rxrpc_local *);
 997
 998 /*
 999  * local_object.c
1000  */
1001 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
1002 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *);
1003 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *);
1004 void rxrpc_put_local(struct rxrpc_local *);
1005 void rxrpc_queue_local(struct rxrpc_local *);
1006 void rxrpc_destroy_all_locals(struct rxrpc_net *);
1007
1008 /*
1009  * misc.c
1010  */
1011 extern unsigned int rxrpc_max_backlog __read_mostly;
1012 extern unsigned long rxrpc_requested_ack_delay;
1013 extern unsigned long rxrpc_soft_ack_delay;
1014 extern unsigned long rxrpc_idle_ack_delay;
1015 extern unsigned int rxrpc_rx_window_size;
1016 extern unsigned int rxrpc_rx_mtu;
1017 extern unsigned int rxrpc_rx_jumbo_max;
1018 extern unsigned long rxrpc_resend_timeout;
1019
1020 extern const s8 rxrpc_ack_priority[];
1021
1022 /*
1023  * net_ns.c
1024  */
1025 extern unsigned int rxrpc_net_id;
1026 extern struct pernet_operations rxrpc_net_ops;
1027
1028 static inline struct rxrpc_net *rxrpc_net(struct net *net)
1029 {
1030         return net_generic(net, rxrpc_net_id);
1031 }
1032
1033 /*
1034  * output.c
1035  */
1036 int rxrpc_send_ack_packet(struct rxrpc_call *, bool, rxrpc_serial_t *);
1037 int rxrpc_send_abort_packet(struct rxrpc_call *);
1038 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
1039 void rxrpc_reject_packets(struct rxrpc_local *);
1040 void rxrpc_send_keepalive(struct rxrpc_peer *);
1041
1042 /*
1043  * peer_event.c
1044  */
1045 void rxrpc_error_report(struct sock *);
1046 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
1047                         rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1048 void rxrpc_peer_keepalive_worker(struct work_struct *);
1049
1050 /*
1051  * peer_object.c
1052  */
1053 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1054                                          const struct sockaddr_rxrpc *);
1055 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *, struct rxrpc_local *,
1056                                      struct sockaddr_rxrpc *, gfp_t);
1057 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
1058 void rxrpc_new_incoming_peer(struct rxrpc_sock *, struct rxrpc_local *,
1059                              struct rxrpc_peer *);
1060 void rxrpc_destroy_all_peers(struct rxrpc_net *);
1061 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *);
1062 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *);
1063 void rxrpc_put_peer(struct rxrpc_peer *);
1064
1065 /*
1066  * proc.c
1067  */
1068 extern const struct seq_operations rxrpc_call_seq_ops;
1069 extern const struct seq_operations rxrpc_connection_seq_ops;
1070 extern const struct seq_operations rxrpc_peer_seq_ops;
1071
1072 /*
1073  * recvmsg.c
1074  */
1075 void rxrpc_notify_socket(struct rxrpc_call *);
1076 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1077
1078 /*
1079  * rxkad.c
1080  */
1081 #ifdef CONFIG_RXKAD
1082 extern const struct rxrpc_security rxkad;
1083 #endif
1084
1085 /*
1086  * security.c
1087  */
1088 int __init rxrpc_init_security(void);
1089 void rxrpc_exit_security(void);
1090 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1091 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
1092
1093 /*
1094  * sendmsg.c
1095  */
1096 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1097
1098 /*
1099  * skbuff.c
1100  */
1101 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1102 void rxrpc_packet_destructor(struct sk_buff *);
1103 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1104 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1105 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1106 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1107 void rxrpc_purge_queue(struct sk_buff_head *);
1108
1109 /*
1110  * sysctl.c
1111  */
1112 #ifdef CONFIG_SYSCTL
1113 extern int __init rxrpc_sysctl_init(void);
1114 extern void rxrpc_sysctl_exit(void);
1115 #else
1116 static inline int __init rxrpc_sysctl_init(void) { return 0; }
1117 static inline void rxrpc_sysctl_exit(void) {}
1118 #endif
1119
1120 /*
1121  * utils.c
1122  */
1123 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1124
1125 static inline bool before(u32 seq1, u32 seq2)
1126 {
1127         return (s32)(seq1 - seq2) < 0;
1128 }
1129 static inline bool before_eq(u32 seq1, u32 seq2)
1130 {
1131         return (s32)(seq1 - seq2) <= 0;
1132 }
1133 static inline bool after(u32 seq1, u32 seq2)
1134 {
1135         return (s32)(seq1 - seq2) > 0;
1136 }
1137 static inline bool after_eq(u32 seq1, u32 seq2)
1138 {
1139         return (s32)(seq1 - seq2) >= 0;
1140 }
1141
1142 /*
1143  * debug tracing
1144  */
1145 extern unsigned int rxrpc_debug;
1146
1147 #define dbgprintk(FMT,...) \
1148         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1149
1150 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1151 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1152 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
1153 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
1154 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1155
1156
1157 #if defined(__KDEBUG)
1158 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1159 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1160 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1161 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
1162 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
1163
1164 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1165 #define RXRPC_DEBUG_KENTER      0x01
1166 #define RXRPC_DEBUG_KLEAVE      0x02
1167 #define RXRPC_DEBUG_KDEBUG      0x04
1168 #define RXRPC_DEBUG_KPROTO      0x08
1169 #define RXRPC_DEBUG_KNET        0x10
1170
1171 #define _enter(FMT,...)                                 \
1172 do {                                                    \
1173         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1174                 kenter(FMT,##__VA_ARGS__);              \
1175 } while (0)
1176
1177 #define _leave(FMT,...)                                 \
1178 do {                                                    \
1179         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1180                 kleave(FMT,##__VA_ARGS__);              \
1181 } while (0)
1182
1183 #define _debug(FMT,...)                                 \
1184 do {                                                    \
1185         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1186                 kdebug(FMT,##__VA_ARGS__);              \
1187 } while (0)
1188
1189 #define _proto(FMT,...)                                 \
1190 do {                                                    \
1191         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
1192                 kproto(FMT,##__VA_ARGS__);              \
1193 } while (0)
1194
1195 #define _net(FMT,...)                                   \
1196 do {                                                    \
1197         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
1198                 knet(FMT,##__VA_ARGS__);                \
1199 } while (0)
1200
1201 #else
1202 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1203 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1204 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
1205 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
1206 #define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
1207 #endif
1208
1209 /*
1210  * debug assertion checking
1211  */
1212 #if 1 // defined(__KDEBUGALL)
1213
1214 #define ASSERT(X)                                               \
1215 do {                                                            \
1216         if (unlikely(!(X))) {                                   \
1217                 pr_err("Assertion failed\n");                   \
1218                 BUG();                                          \
1219         }                                                       \
1220 } while (0)
1221
1222 #define ASSERTCMP(X, OP, Y)                                             \
1223 do {                                                                    \
1224         __typeof__(X) _x = (X);                                         \
1225         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1226         if (unlikely(!(_x OP _y))) {                                    \
1227                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1228                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1229                        (unsigned long)_y, (unsigned long)_y);           \
1230                 BUG();                                                  \
1231         }                                                               \
1232 } while (0)
1233
1234 #define ASSERTIF(C, X)                                          \
1235 do {                                                            \
1236         if (unlikely((C) && !(X))) {                            \
1237                 pr_err("Assertion failed\n");                   \
1238                 BUG();                                          \
1239         }                                                       \
1240 } while (0)
1241
1242 #define ASSERTIFCMP(C, X, OP, Y)                                        \
1243 do {                                                                    \
1244         __typeof__(X) _x = (X);                                         \
1245         __typeof__(Y) _y = (__typeof__(X))(Y);                          \
1246         if (unlikely((C) && !(_x OP _y))) {                             \
1247                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1248                        (unsigned long)_x, (unsigned long)_x, #OP,       \
1249                        (unsigned long)_y, (unsigned long)_y);           \
1250                 BUG();                                                  \
1251         }                                                               \
1252 } while (0)
1253
1254 #else
1255
1256 #define ASSERT(X)                               \
1257 do {                                            \
1258 } while (0)
1259
1260 #define ASSERTCMP(X, OP, Y)                     \
1261 do {                                            \
1262 } while (0)
1263
1264 #define ASSERTIF(C, X)                          \
1265 do {                                            \
1266 } while (0)
1267
1268 #define ASSERTIFCMP(C, X, OP, Y)                \
1269 do {                                            \
1270 } while (0)
1271
1272 #endif /* __KDEBUGALL */