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 <net/sock.h>
  14 #include <net/af_rxrpc.h>
  15 #include <rxrpc/packet.h>
  16
  17 #if 0
  18 #define CHECK_SLAB_OKAY(X)                                   \
  19         BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
  20                (POISON_FREE << 8 | POISON_FREE))
  21 #else
  22 #define CHECK_SLAB_OKAY(X) do {} while (0)
  23 #endif
  24
  25 #define FCRYPT_BSIZE 8
  26 struct rxrpc_crypt {
  27         union {
  28                 u8      x[FCRYPT_BSIZE];
  29                 __be32  n[2];
  30         };
  31 } __attribute__((aligned(8)));
  32
  33 #define rxrpc_queue_work(WS)    queue_work(rxrpc_workqueue, (WS))
  34 #define rxrpc_queue_delayed_work(WS,D)  \
  35         queue_delayed_work(rxrpc_workqueue, (WS), (D))
  36
  37 #define rxrpc_queue_call(CALL)  rxrpc_queue_work(&(CALL)->processor)
  38 #define rxrpc_queue_conn(CONN)  rxrpc_queue_work(&(CONN)->processor)
  39
  40 struct rxrpc_connection;
  41
  42 /*
  43  * sk_state for RxRPC sockets
  44  */
  45 enum {
  46         RXRPC_UNBOUND = 0,
  47         RXRPC_CLIENT_UNBOUND,           /* Unbound socket used as client */
  48         RXRPC_CLIENT_BOUND,             /* client local address bound */
  49         RXRPC_SERVER_BOUND,             /* server local address bound */
  50         RXRPC_SERVER_LISTENING,         /* server listening for connections */
  51         RXRPC_CLOSE,                    /* socket is being closed */
  52 };
  53
  54 /*
  55  * RxRPC socket definition
  56  */
  57 struct rxrpc_sock {
  58         /* WARNING: sk has to be the first member */
  59         struct sock             sk;
  60         rxrpc_interceptor_t     interceptor;    /* kernel service Rx interceptor function */
  61         struct rxrpc_local      *local;         /* local endpoint */
  62         struct list_head        listen_link;    /* link in the local endpoint's listen list */
  63         struct list_head        secureq;        /* calls awaiting connection security clearance */
  64         struct list_head        acceptq;        /* calls awaiting acceptance */
  65         struct key              *key;           /* security for this socket */
  66         struct key              *securities;    /* list of server security descriptors */
  67         struct rb_root          calls;          /* outstanding calls on this socket */
  68         unsigned long           flags;
  69 #define RXRPC_SOCK_CONNECTED            0       /* connect_srx is set */
  70         rwlock_t                call_lock;      /* lock for calls */
  71         u32                     min_sec_level;  /* minimum security level */
  72 #define RXRPC_SECURITY_MAX      RXRPC_SECURITY_ENCRYPT
  73         bool                    exclusive;      /* Exclusive connection for a client socket */
  74         sa_family_t             family;         /* Protocol family created with */
  75         struct sockaddr_rxrpc   srx;            /* local address */
  76         struct sockaddr_rxrpc   connect_srx;    /* Default client address from connect() */
  77 };
  78
  79 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
  80
  81 /*
  82  * CPU-byteorder normalised Rx packet header.
  83  */
  84 struct rxrpc_host_header {
  85         u32             epoch;          /* client boot timestamp */
  86         u32             cid;            /* connection and channel ID */
  87         u32             callNumber;     /* call ID (0 for connection-level packets) */
  88         u32             seq;            /* sequence number of pkt in call stream */
  89         u32             serial;         /* serial number of pkt sent to network */
  90         u8              type;           /* packet type */
  91         u8              flags;          /* packet flags */
  92         u8              userStatus;     /* app-layer defined status */
  93         u8              securityIndex;  /* security protocol ID */
  94         union {
  95                 u16     _rsvd;          /* reserved */
  96                 u16     cksum;          /* kerberos security checksum */
  97         };
  98         u16             serviceId;      /* service ID */
  99 } __packed;
 100
 101 /*
 102  * RxRPC socket buffer private variables
 103  * - max 48 bytes (struct sk_buff::cb)
 104  */
 105 struct rxrpc_skb_priv {
 106         struct rxrpc_call       *call;          /* call with which associated */
 107         unsigned long           resend_at;      /* time in jiffies at which to resend */
 108         union {
 109                 unsigned int    offset;         /* offset into buffer of next read */
 110                 int             remain;         /* amount of space remaining for next write */
 111                 u32             error;          /* network error code */
 112                 bool            need_resend;    /* T if needs resending */
 113         };
 114
 115         struct rxrpc_host_header hdr;           /* RxRPC packet header from this packet */
 116 };
 117
 118 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
 119
 120 enum rxrpc_command {
 121         RXRPC_CMD_SEND_DATA,            /* send data message */
 122         RXRPC_CMD_SEND_ABORT,           /* request abort generation */
 123         RXRPC_CMD_ACCEPT,               /* [server] accept incoming call */
 124         RXRPC_CMD_REJECT_BUSY,          /* [server] reject a call as busy */
 125 };
 126
 127 /*
 128  * RxRPC security module interface
 129  */
 130 struct rxrpc_security {
 131         const char              *name;          /* name of this service */
 132         u8                      security_index; /* security type provided */
 133
 134         /* Initialise a security service */
 135         int (*init)(void);
 136
 137         /* Clean up a security service */
 138         void (*exit)(void);
 139
 140         /* initialise a connection's security */
 141         int (*init_connection_security)(struct rxrpc_connection *);
 142
 143         /* prime a connection's packet security */
 144         int (*prime_packet_security)(struct rxrpc_connection *);
 145
 146         /* impose security on a packet */
 147         int (*secure_packet)(struct rxrpc_call *,
 148                              struct sk_buff *,
 149                              size_t,
 150                              void *);
 151
 152         /* verify the security on a received packet */
 153         int (*verify_packet)(struct rxrpc_call *, struct sk_buff *, u32 *);
 154
 155         /* issue a challenge */
 156         int (*issue_challenge)(struct rxrpc_connection *);
 157
 158         /* respond to a challenge */
 159         int (*respond_to_challenge)(struct rxrpc_connection *,
 160                                     struct sk_buff *,
 161                                     u32 *);
 162
 163         /* verify a response */
 164         int (*verify_response)(struct rxrpc_connection *,
 165                                struct sk_buff *,
 166                                u32 *);
 167
 168         /* clear connection security */
 169         void (*clear)(struct rxrpc_connection *);
 170 };
 171
 172 /*
 173  * RxRPC local transport endpoint description
 174  * - owned by a single AF_RXRPC socket
 175  * - pointed to by transport socket struct sk_user_data
 176  */
 177 struct rxrpc_local {
 178         struct rcu_head         rcu;
 179         atomic_t                usage;
 180         struct list_head        link;
 181         struct socket           *socket;        /* my UDP socket */
 182         struct work_struct      processor;
 183         struct list_head        services;       /* services listening on this endpoint */
 184         struct rw_semaphore     defrag_sem;     /* control re-enablement of IP DF bit */
 185         struct sk_buff_head     accept_queue;   /* incoming calls awaiting acceptance */
 186         struct sk_buff_head     reject_queue;   /* packets awaiting rejection */
 187         struct sk_buff_head     event_queue;    /* endpoint event packets awaiting processing */
 188         struct rb_root          client_conns;   /* Client connections by socket params */
 189         spinlock_t              client_conns_lock; /* Lock for client_conns */
 190         spinlock_t              lock;           /* access lock */
 191         rwlock_t                services_lock;  /* lock for services list */
 192         int                     debug_id;       /* debug ID for printks */
 193         bool                    dead;
 194         struct sockaddr_rxrpc   srx;            /* local address */
 195 };
 196
 197 /*
 198  * RxRPC remote transport endpoint definition
 199  * - matched by local endpoint, remote port, address and protocol type
 200  */
 201 struct rxrpc_peer {
 202         struct rcu_head         rcu;            /* This must be first */
 203         atomic_t                usage;
 204         unsigned long           hash_key;
 205         struct hlist_node       hash_link;
 206         struct rxrpc_local      *local;
 207         struct hlist_head       error_targets;  /* targets for net error distribution */
 208         struct work_struct      error_distributor;
 209         struct rb_root          service_conns;  /* Service connections */
 210         rwlock_t                conn_lock;
 211         spinlock_t              lock;           /* access lock */
 212         unsigned int            if_mtu;         /* interface MTU for this peer */
 213         unsigned int            mtu;            /* network MTU for this peer */
 214         unsigned int            maxdata;        /* data size (MTU - hdrsize) */
 215         unsigned short          hdrsize;        /* header size (IP + UDP + RxRPC) */
 216         int                     debug_id;       /* debug ID for printks */
 217         int                     error_report;   /* Net (+0) or local (+1000000) to distribute */
 218 #define RXRPC_LOCAL_ERROR_OFFSET 1000000
 219         struct sockaddr_rxrpc   srx;            /* remote address */
 220
 221         /* calculated RTT cache */
 222 #define RXRPC_RTT_CACHE_SIZE 32
 223         suseconds_t             rtt;            /* current RTT estimate (in uS) */
 224         unsigned int            rtt_point;      /* next entry at which to insert */
 225         unsigned int            rtt_usage;      /* amount of cache actually used */
 226         suseconds_t             rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* calculated RTT cache */
 227 };
 228
 229 /*
 230  * Keys for matching a connection.
 231  */
 232 struct rxrpc_conn_proto {
 233         unsigned long           hash_key;
 234         struct rxrpc_local      *local;         /* Representation of local endpoint */
 235         u32                     epoch;          /* epoch of this connection */
 236         u32                     cid;            /* connection ID */
 237         u8                      in_clientflag;  /* RXRPC_CLIENT_INITIATED if we are server */
 238         u8                      addr_size;      /* Size of the address */
 239         sa_family_t             family;         /* Transport protocol */
 240         __be16                  port;           /* Peer UDP/UDP6 port */
 241         union {                                 /* Peer address */
 242                 struct in_addr  ipv4_addr;
 243                 struct in6_addr ipv6_addr;
 244                 u32             raw_addr[0];
 245         };
 246 };
 247
 248 struct rxrpc_conn_parameters {
 249         struct rxrpc_local      *local;         /* Representation of local endpoint */
 250         struct rxrpc_peer       *peer;          /* Remote endpoint */
 251         struct key              *key;           /* Security details */
 252         bool                    exclusive;      /* T if conn is exclusive */
 253         u16                     service_id;     /* Service ID for this connection */
 254         u32                     security_level; /* Security level selected */
 255 };
 256
 257 /*
 258  * RxRPC connection definition
 259  * - matched by { local, peer, epoch, conn_id, direction }
 260  * - each connection can only handle four simultaneous calls
 261  */
 262 struct rxrpc_connection {
 263         struct rxrpc_conn_proto proto;
 264         struct rxrpc_conn_parameters params;
 265
 266         spinlock_t              channel_lock;
 267         struct rxrpc_call       *channels[RXRPC_MAXCALLS]; /* active calls */
 268         wait_queue_head_t       channel_wq;     /* queue to wait for channel to become available */
 269
 270         struct work_struct      processor;      /* connection event processor */
 271         union {
 272                 struct rb_node  client_node;    /* Node in local->client_conns */
 273                 struct rb_node  service_node;   /* Node in peer->service_conns */
 274         };
 275         struct list_head        link;           /* link in master connection list */
 276         struct rb_root          calls;          /* calls on this connection */
 277         struct sk_buff_head     rx_queue;       /* received conn-level packets */
 278         const struct rxrpc_security *security;  /* applied security module */
 279         struct key              *server_key;    /* security for this service */
 280         struct crypto_skcipher  *cipher;        /* encryption handle */
 281         struct rxrpc_crypt      csum_iv;        /* packet checksum base */
 282         unsigned long           flags;
 283 #define RXRPC_CONN_HAS_IDR      0               /* - Has a client conn ID assigned */
 284         unsigned long           events;
 285 #define RXRPC_CONN_CHALLENGE    0               /* send challenge packet */
 286         unsigned long           put_time;       /* Time at which last put */
 287         rwlock_t                lock;           /* access lock */
 288         spinlock_t              state_lock;     /* state-change lock */
 289         atomic_t                usage;
 290         enum {                                  /* current state of connection */
 291                 RXRPC_CONN_UNUSED,              /* - connection not yet attempted */
 292                 RXRPC_CONN_CLIENT,              /* - client connection */
 293                 RXRPC_CONN_SERVER_UNSECURED,    /* - server unsecured connection */
 294                 RXRPC_CONN_SERVER_CHALLENGING,  /* - server challenging for security */
 295                 RXRPC_CONN_SERVER,              /* - server secured connection */
 296                 RXRPC_CONN_REMOTELY_ABORTED,    /* - conn aborted by peer */
 297                 RXRPC_CONN_LOCALLY_ABORTED,     /* - conn aborted locally */
 298                 RXRPC_CONN_NETWORK_ERROR,       /* - conn terminated by network error */
 299         } state;
 300         u32                     local_abort;    /* local abort code */
 301         u32                     remote_abort;   /* remote abort code */
 302         int                     error;          /* local error incurred */
 303         int                     debug_id;       /* debug ID for printks */
 304         unsigned int            call_counter;   /* call ID counter */
 305         atomic_t                serial;         /* packet serial number counter */
 306         atomic_t                hi_serial;      /* highest serial number received */
 307         atomic_t                avail_chans;    /* number of channels available */
 308         u8                      size_align;     /* data size alignment (for security) */
 309         u8                      header_size;    /* rxrpc + security header size */
 310         u8                      security_size;  /* security header size */
 311         u32                     security_nonce; /* response re-use preventer */
 312         u8                      security_ix;    /* security type */
 313         u8                      out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
 314 };
 315
 316 /*
 317  * Flags in call->flags.
 318  */
 319 enum rxrpc_call_flag {
 320         RXRPC_CALL_RELEASED,            /* call has been released - no more message to userspace */
 321         RXRPC_CALL_TERMINAL_MSG,        /* call has given the socket its final message */
 322         RXRPC_CALL_RCVD_LAST,           /* all packets received */
 323         RXRPC_CALL_RUN_RTIMER,          /* Tx resend timer started */
 324         RXRPC_CALL_TX_SOFT_ACK,         /* sent some soft ACKs */
 325         RXRPC_CALL_PROC_BUSY,           /* the processor is busy */
 326         RXRPC_CALL_INIT_ACCEPT,         /* acceptance was initiated */
 327         RXRPC_CALL_HAS_USERID,          /* has a user ID attached */
 328         RXRPC_CALL_EXPECT_OOS,          /* expect out of sequence packets */
 329 };
 330
 331 /*
 332  * Events that can be raised on a call.
 333  */
 334 enum rxrpc_call_event {
 335         RXRPC_CALL_EV_RCVD_ACKALL,      /* ACKALL or reply received */
 336         RXRPC_CALL_EV_RCVD_BUSY,        /* busy packet received */
 337         RXRPC_CALL_EV_RCVD_ABORT,       /* abort packet received */
 338         RXRPC_CALL_EV_RCVD_ERROR,       /* network error received */
 339         RXRPC_CALL_EV_ACK_FINAL,        /* need to generate final ACK (and release call) */
 340         RXRPC_CALL_EV_ACK,              /* need to generate ACK */
 341         RXRPC_CALL_EV_REJECT_BUSY,      /* need to generate busy message */
 342         RXRPC_CALL_EV_ABORT,            /* need to generate abort */
 343         RXRPC_CALL_EV_CONN_ABORT,       /* local connection abort generated */
 344         RXRPC_CALL_EV_RESEND_TIMER,     /* Tx resend timer expired */
 345         RXRPC_CALL_EV_RESEND,           /* Tx resend required */
 346         RXRPC_CALL_EV_DRAIN_RX_OOS,     /* drain the Rx out of sequence queue */
 347         RXRPC_CALL_EV_LIFE_TIMER,       /* call's lifetimer ran out */
 348         RXRPC_CALL_EV_ACCEPTED,         /* incoming call accepted by userspace app */
 349         RXRPC_CALL_EV_SECURED,          /* incoming call's connection is now secure */
 350         RXRPC_CALL_EV_POST_ACCEPT,      /* need to post an "accept?" message to the app */
 351         RXRPC_CALL_EV_RELEASE,          /* need to release the call's resources */
 352 };
 353
 354 /*
 355  * The states that a call can be in.
 356  */
 357 enum rxrpc_call_state {
 358         RXRPC_CALL_UNINITIALISED,
 359         RXRPC_CALL_CLIENT_AWAIT_CONN,   /* - client waiting for connection to become available */
 360         RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
 361         RXRPC_CALL_CLIENT_AWAIT_REPLY,  /* - client awaiting reply */
 362         RXRPC_CALL_CLIENT_RECV_REPLY,   /* - client receiving reply phase */
 363         RXRPC_CALL_CLIENT_FINAL_ACK,    /* - client sending final ACK phase */
 364         RXRPC_CALL_SERVER_SECURING,     /* - server securing request connection */
 365         RXRPC_CALL_SERVER_ACCEPTING,    /* - server accepting request */
 366         RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
 367         RXRPC_CALL_SERVER_ACK_REQUEST,  /* - server pending ACK of request */
 368         RXRPC_CALL_SERVER_SEND_REPLY,   /* - server sending reply */
 369         RXRPC_CALL_SERVER_AWAIT_ACK,    /* - server awaiting final ACK */
 370         RXRPC_CALL_COMPLETE,            /* - call completed */
 371         RXRPC_CALL_SERVER_BUSY,         /* - call rejected by busy server */
 372         RXRPC_CALL_REMOTELY_ABORTED,    /* - call aborted by peer */
 373         RXRPC_CALL_LOCALLY_ABORTED,     /* - call aborted locally on error or close */
 374         RXRPC_CALL_NETWORK_ERROR,       /* - call terminated by network error */
 375         RXRPC_CALL_DEAD,                /* - call is dead */
 376         NR__RXRPC_CALL_STATES
 377 };
 378
 379 /*
 380  * RxRPC call definition
 381  * - matched by { connection, call_id }
 382  */
 383 struct rxrpc_call {
 384         struct rxrpc_connection *conn;          /* connection carrying call */
 385         struct rxrpc_sock       *socket;        /* socket responsible */
 386         struct timer_list       lifetimer;      /* lifetime remaining on call */
 387         struct timer_list       deadspan;       /* reap timer for re-ACK'ing, etc  */
 388         struct timer_list       ack_timer;      /* ACK generation timer */
 389         struct timer_list       resend_timer;   /* Tx resend timer */
 390         struct work_struct      destroyer;      /* call destroyer */
 391         struct work_struct      processor;      /* packet processor and ACK generator */
 392         struct list_head        link;           /* link in master call list */
 393         struct hlist_node       error_link;     /* link in error distribution list */
 394         struct list_head        accept_link;    /* calls awaiting acceptance */
 395         struct rb_node          sock_node;      /* node in socket call tree */
 396         struct rb_node          conn_node;      /* node in connection call tree */
 397         struct sk_buff_head     rx_queue;       /* received packets */
 398         struct sk_buff_head     rx_oos_queue;   /* packets received out of sequence */
 399         struct sk_buff          *tx_pending;    /* Tx socket buffer being filled */
 400         wait_queue_head_t       tx_waitq;       /* wait for Tx window space to become available */
 401         __be32                  crypto_buf[2];  /* Temporary packet crypto buffer */
 402         unsigned long           user_call_ID;   /* user-defined call ID */
 403         unsigned long           creation_jif;   /* time of call creation */
 404         unsigned long           flags;
 405         unsigned long           events;
 406         spinlock_t              lock;
 407         rwlock_t                state_lock;     /* lock for state transition */
 408         atomic_t                usage;
 409         atomic_t                sequence;       /* Tx data packet sequence counter */
 410         u32                     local_abort;    /* local abort code */
 411         u32                     remote_abort;   /* remote abort code */
 412         int                     error_report;   /* Network error (ICMP/local transport) */
 413         int                     error;          /* Local error incurred */
 414         enum rxrpc_call_state   state : 8;      /* current state of call */
 415         int                     debug_id;       /* debug ID for printks */
 416         u8                      channel;        /* connection channel occupied by this call */
 417
 418         /* transmission-phase ACK management */
 419         u8                      acks_head;      /* offset into window of first entry */
 420         u8                      acks_tail;      /* offset into window of last entry */
 421         u8                      acks_winsz;     /* size of un-ACK'd window */
 422         u8                      acks_unacked;   /* lowest unacked packet in last ACK received */
 423         int                     acks_latest;    /* serial number of latest ACK received */
 424         rxrpc_seq_t             acks_hard;      /* highest definitively ACK'd msg seq */
 425         unsigned long           *acks_window;   /* sent packet window
 426                                                  * - elements are pointers with LSB set if ACK'd
 427                                                  */
 428
 429         /* receive-phase ACK management */
 430         rxrpc_seq_t             rx_data_expect; /* next data seq ID expected to be received */
 431         rxrpc_seq_t             rx_data_post;   /* next data seq ID expected to be posted */
 432         rxrpc_seq_t             rx_data_recv;   /* last data seq ID encountered by recvmsg */
 433         rxrpc_seq_t             rx_data_eaten;  /* last data seq ID consumed by recvmsg */
 434         rxrpc_seq_t             rx_first_oos;   /* first packet in rx_oos_queue (or 0) */
 435         rxrpc_seq_t             ackr_win_top;   /* top of ACK window (rx_data_eaten is bottom) */
 436         rxrpc_seq_t             ackr_prev_seq;  /* previous sequence number received */
 437         u8                      ackr_reason;    /* reason to ACK */
 438         rxrpc_serial_t          ackr_serial;    /* serial of packet being ACK'd */
 439         atomic_t                ackr_not_idle;  /* number of packets in Rx queue */
 440
 441         /* received packet records, 1 bit per record */
 442 #define RXRPC_ACKR_WINDOW_ASZ DIV_ROUND_UP(RXRPC_MAXACKS, BITS_PER_LONG)
 443         unsigned long           ackr_window[RXRPC_ACKR_WINDOW_ASZ + 1];
 444
 445         struct hlist_node       hash_node;
 446         unsigned long           hash_key;       /* Full hash key */
 447         u8                      in_clientflag;  /* Copy of conn->in_clientflag for hashing */
 448         struct rxrpc_local      *local;         /* Local endpoint. Used for hashing. */
 449         sa_family_t             family;         /* Frame protocol */
 450         u32                     call_id;        /* call ID on connection  */
 451         u32                     cid;            /* connection ID plus channel index */
 452         u32                     epoch;          /* epoch of this connection */
 453         u16                     service_id;     /* service ID */
 454         union {                                 /* Peer IP address for hashing */
 455                 __be32  ipv4_addr;
 456                 __u8    ipv6_addr[16];          /* Anticipates eventual IPv6 support */
 457         } peer_ip;
 458 };
 459
 460 /*
 461  * locally abort an RxRPC call
 462  */
 463 static inline void rxrpc_abort_call(struct rxrpc_call *call, u32 abort_code)
 464 {
 465         write_lock_bh(&call->state_lock);
 466         if (call->state < RXRPC_CALL_COMPLETE) {
 467                 call->local_abort = abort_code;
 468                 call->state = RXRPC_CALL_LOCALLY_ABORTED;
 469                 set_bit(RXRPC_CALL_EV_ABORT, &call->events);
 470         }
 471         write_unlock_bh(&call->state_lock);
 472 }
 473
 474 /*
 475  * af_rxrpc.c
 476  */
 477 extern atomic_t rxrpc_n_skbs;
 478 extern u32 rxrpc_epoch;
 479 extern atomic_t rxrpc_debug_id;
 480 extern struct workqueue_struct *rxrpc_workqueue;
 481
 482 /*
 483  * call_accept.c
 484  */
 485 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
 486 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long);
 487 int rxrpc_reject_call(struct rxrpc_sock *);
 488
 489 /*
 490  * call_event.c
 491  */
 492 void __rxrpc_propose_ACK(struct rxrpc_call *, u8, u32, bool);
 493 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u32, bool);
 494 void rxrpc_process_call(struct work_struct *);
 495
 496 /*
 497  * call_object.c
 498  */
 499 extern unsigned int rxrpc_max_call_lifetime;
 500 extern unsigned int rxrpc_dead_call_expiry;
 501 extern struct kmem_cache *rxrpc_call_jar;
 502 extern struct list_head rxrpc_calls;
 503 extern rwlock_t rxrpc_call_lock;
 504
 505 struct rxrpc_call *rxrpc_find_call_hash(struct rxrpc_host_header *,
 506                                         void *, sa_family_t, const void *);
 507 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
 508 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
 509                                          struct rxrpc_conn_parameters *,
 510                                          struct sockaddr_rxrpc *,
 511                                          unsigned long, gfp_t);
 512 struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *,
 513                                        struct rxrpc_connection *,
 514                                        struct sk_buff *);
 515 void rxrpc_release_call(struct rxrpc_call *);
 516 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 517 void __rxrpc_put_call(struct rxrpc_call *);
 518 void __exit rxrpc_destroy_all_calls(void);
 519
 520 /*
 521  * conn_client.c
 522  */
 523 extern struct idr rxrpc_client_conn_ids;
 524
 525 int rxrpc_get_client_connection_id(struct rxrpc_connection *, gfp_t);
 526 void rxrpc_put_client_connection_id(struct rxrpc_connection *);
 527
 528 /*
 529  * conn_event.c
 530  */
 531 void rxrpc_process_connection(struct work_struct *);
 532 void rxrpc_reject_packet(struct rxrpc_local *, struct sk_buff *);
 533 void rxrpc_reject_packets(struct rxrpc_local *);
 534
 535 /*
 536  * conn_object.c
 537  */
 538 extern unsigned int rxrpc_connection_expiry;
 539 extern struct list_head rxrpc_connections;
 540 extern rwlock_t rxrpc_connection_lock;
 541
 542 int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *,
 543                        struct sockaddr_rxrpc *, gfp_t);
 544 struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_local *,
 545                                                struct rxrpc_peer *,
 546                                                struct sk_buff *);
 547 void rxrpc_disconnect_call(struct rxrpc_call *);
 548 void rxrpc_put_connection(struct rxrpc_connection *);
 549 void __exit rxrpc_destroy_all_connections(void);
 550 struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_local *,
 551                                                    struct rxrpc_peer *,
 552                                                    struct sk_buff *);
 553
 554 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
 555 {
 556         return conn->out_clientflag;
 557 }
 558
 559 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
 560 {
 561         return conn->proto.in_clientflag;
 562 }
 563
 564 static inline void rxrpc_get_connection(struct rxrpc_connection *conn)
 565 {
 566         atomic_inc(&conn->usage);
 567 }
 568
 569 /*
 570  * input.c
 571  */
 572 void rxrpc_data_ready(struct sock *);
 573 int rxrpc_queue_rcv_skb(struct rxrpc_call *, struct sk_buff *, bool, bool);
 574 void rxrpc_fast_process_packet(struct rxrpc_call *, struct sk_buff *);
 575
 576 /*
 577  * insecure.c
 578  */
 579 extern const struct rxrpc_security rxrpc_no_security;
 580
 581 /*
 582  * key.c
 583  */
 584 extern struct key_type key_type_rxrpc;
 585 extern struct key_type key_type_rxrpc_s;
 586
 587 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
 588 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
 589 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time_t,
 590                               u32);
 591
 592 /*
 593  * local_event.c
 594  */
 595 extern void rxrpc_process_local_events(struct rxrpc_local *);
 596
 597 /*
 598  * local_object.c
 599  */
 600 struct rxrpc_local *rxrpc_lookup_local(const struct sockaddr_rxrpc *);
 601 void __rxrpc_put_local(struct rxrpc_local *);
 602 void __exit rxrpc_destroy_all_locals(void);
 603
 604 static inline void rxrpc_get_local(struct rxrpc_local *local)
 605 {
 606         atomic_inc(&local->usage);
 607 }
 608
 609 static inline
 610 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local)
 611 {
 612         return atomic_inc_not_zero(&local->usage) ? local : NULL;
 613 }
 614
 615 static inline void rxrpc_put_local(struct rxrpc_local *local)
 616 {
 617         if (local && atomic_dec_and_test(&local->usage))
 618                 __rxrpc_put_local(local);
 619 }
 620
 621 /*
 622  * misc.c
 623  */
 624 extern unsigned int rxrpc_max_backlog __read_mostly;
 625 extern unsigned int rxrpc_requested_ack_delay;
 626 extern unsigned int rxrpc_soft_ack_delay;
 627 extern unsigned int rxrpc_idle_ack_delay;
 628 extern unsigned int rxrpc_rx_window_size;
 629 extern unsigned int rxrpc_rx_mtu;
 630 extern unsigned int rxrpc_rx_jumbo_max;
 631
 632 extern const char *const rxrpc_pkts[];
 633 extern const s8 rxrpc_ack_priority[];
 634
 635 extern const char *rxrpc_acks(u8 reason);
 636
 637 /*
 638  * output.c
 639  */
 640 extern unsigned int rxrpc_resend_timeout;
 641
 642 int rxrpc_send_data_packet(struct rxrpc_connection *, struct sk_buff *);
 643 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
 644
 645 /*
 646  * peer_event.c
 647  */
 648 void rxrpc_error_report(struct sock *);
 649 void rxrpc_peer_error_distributor(struct work_struct *);
 650
 651 /*
 652  * peer_object.c
 653  */
 654 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
 655                                          const struct sockaddr_rxrpc *);
 656 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *,
 657                                      struct sockaddr_rxrpc *, gfp_t);
 658 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
 659
 660 static inline void rxrpc_get_peer(struct rxrpc_peer *peer)
 661 {
 662         atomic_inc(&peer->usage);
 663 }
 664
 665 static inline
 666 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer)
 667 {
 668         return atomic_inc_not_zero(&peer->usage) ? peer : NULL;
 669 }
 670
 671 extern void __rxrpc_put_peer(struct rxrpc_peer *peer);
 672 static inline void rxrpc_put_peer(struct rxrpc_peer *peer)
 673 {
 674         if (peer && atomic_dec_and_test(&peer->usage))
 675                 __rxrpc_put_peer(peer);
 676 }
 677
 678 /*
 679  * proc.c
 680  */
 681 extern const char *const rxrpc_call_states[];
 682 extern const struct file_operations rxrpc_call_seq_fops;
 683 extern const struct file_operations rxrpc_connection_seq_fops;
 684
 685 /*
 686  * recvmsg.c
 687  */
 688 void rxrpc_remove_user_ID(struct rxrpc_sock *, struct rxrpc_call *);
 689 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
 690
 691 /*
 692  * rxkad.c
 693  */
 694 #ifdef CONFIG_RXKAD
 695 extern const struct rxrpc_security rxkad;
 696 #endif
 697
 698 /*
 699  * security.c
 700  */
 701 int __init rxrpc_init_security(void);
 702 void rxrpc_exit_security(void);
 703 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
 704 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
 705
 706 /*
 707  * skbuff.c
 708  */
 709 void rxrpc_packet_destructor(struct sk_buff *);
 710
 711 /*
 712  * sysctl.c
 713  */
 714 #ifdef CONFIG_SYSCTL
 715 extern int __init rxrpc_sysctl_init(void);
 716 extern void rxrpc_sysctl_exit(void);
 717 #else
 718 static inline int __init rxrpc_sysctl_init(void) { return 0; }
 719 static inline void rxrpc_sysctl_exit(void) {}
 720 #endif
 721
 722 /*
 723  * utils.c
 724  */
 725 void rxrpc_get_addr_from_skb(struct rxrpc_local *, const struct sk_buff *,
 726                              struct sockaddr_rxrpc *);
 727
 728 /*
 729  * debug tracing
 730  */
 731 extern unsigned int rxrpc_debug;
 732
 733 #define dbgprintk(FMT,...) \
 734         printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
 735
 736 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 737 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 738 #define kdebug(FMT,...) dbgprintk("    "FMT ,##__VA_ARGS__)
 739 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
 740 #define knet(FMT,...)   dbgprintk("@@@ "FMT ,##__VA_ARGS__)
 741
 742
 743 #if defined(__KDEBUG)
 744 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
 745 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
 746 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
 747 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
 748 #define _net(FMT,...)   knet(FMT,##__VA_ARGS__)
 749
 750 #elif defined(CONFIG_AF_RXRPC_DEBUG)
 751 #define RXRPC_DEBUG_KENTER      0x01
 752 #define RXRPC_DEBUG_KLEAVE      0x02
 753 #define RXRPC_DEBUG_KDEBUG      0x04
 754 #define RXRPC_DEBUG_KPROTO      0x08
 755 #define RXRPC_DEBUG_KNET        0x10
 756
 757 #define _enter(FMT,...)                                 \
 758 do {                                                    \
 759         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
 760                 kenter(FMT,##__VA_ARGS__);              \
 761 } while (0)
 762
 763 #define _leave(FMT,...)                                 \
 764 do {                                                    \
 765         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
 766                 kleave(FMT,##__VA_ARGS__);              \
 767 } while (0)
 768
 769 #define _debug(FMT,...)                                 \
 770 do {                                                    \
 771         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
 772                 kdebug(FMT,##__VA_ARGS__);              \
 773 } while (0)
 774
 775 #define _proto(FMT,...)                                 \
 776 do {                                                    \
 777         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
 778                 kproto(FMT,##__VA_ARGS__);              \
 779 } while (0)
 780
 781 #define _net(FMT,...)                                   \
 782 do {                                                    \
 783         if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))   \
 784                 knet(FMT,##__VA_ARGS__);                \
 785 } while (0)
 786
 787 #else
 788 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
 789 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
 790 #define _debug(FMT,...) no_printk("    "FMT ,##__VA_ARGS__)
 791 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
 792 #define _net(FMT,...)   no_printk("@@@ "FMT ,##__VA_ARGS__)
 793 #endif
 794
 795 /*
 796  * debug assertion checking
 797  */
 798 #if 1 // defined(__KDEBUGALL)
 799
 800 #define ASSERT(X)                                               \
 801 do {                                                            \
 802         if (unlikely(!(X))) {                                   \
 803                 pr_err("Assertion failed\n");                   \
 804                 BUG();                                          \
 805         }                                                       \
 806 } while (0)
 807
 808 #define ASSERTCMP(X, OP, Y)                                             \
 809 do {                                                                    \
 810         unsigned long _x = (unsigned long)(X);                          \
 811         unsigned long _y = (unsigned long)(Y);                          \
 812         if (unlikely(!(_x OP _y))) {                                    \
 813                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n",                        \
 814                        _x, _x, #OP, _y, _y);                            \
 815                 BUG();                                                  \
 816         }                                                               \
 817 } while (0)
 818
 819 #define ASSERTIF(C, X)                                          \
 820 do {                                                            \
 821         if (unlikely((C) && !(X))) {                            \
 822                 pr_err("Assertion failed\n");                   \
 823                 BUG();                                          \
 824         }                                                       \
 825 } while (0)
 826
 827 #define ASSERTIFCMP(C, X, OP, Y)                                        \
 828 do {                                                                    \
 829         unsigned long _x = (unsigned long)(X);                          \
 830         unsigned long _y = (unsigned long)(Y);                          \
 831         if (unlikely((C) && !(_x OP _y))) {                             \
 832                 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
 833                        _x, _x, #OP, _y, _y);                            \
 834                 BUG();                                                  \
 835         }                                                               \
 836 } while (0)
 837
 838 #else
 839
 840 #define ASSERT(X)                               \
 841 do {                                            \
 842 } while (0)
 843
 844 #define ASSERTCMP(X, OP, Y)                     \
 845 do {                                            \
 846 } while (0)
 847
 848 #define ASSERTIF(C, X)                          \
 849 do {                                            \
 850 } while (0)
 851
 852 #define ASSERTIFCMP(C, X, OP, Y)                \
 853 do {                                            \
 854 } while (0)
 855
 856 #endif /* __KDEBUGALL */
 857
 858 /*
 859  * socket buffer accounting / leak finding
 860  */
 861 static inline void __rxrpc_new_skb(struct sk_buff *skb, const char *fn)
 862 {
 863         //_net("new skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
 864         //atomic_inc(&rxrpc_n_skbs);
 865 }
 866
 867 #define rxrpc_new_skb(skb) __rxrpc_new_skb((skb), __func__)
 868
 869 static inline void __rxrpc_kill_skb(struct sk_buff *skb, const char *fn)
 870 {
 871         //_net("kill skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
 872         //atomic_dec(&rxrpc_n_skbs);
 873 }
 874
 875 #define rxrpc_kill_skb(skb) __rxrpc_kill_skb((skb), __func__)
 876
 877 static inline void __rxrpc_free_skb(struct sk_buff *skb, const char *fn)
 878 {
 879         if (skb) {
 880                 CHECK_SLAB_OKAY(&skb->users);
 881                 //_net("free skb %p %s [%d]",
 882                 //     skb, fn, atomic_read(&rxrpc_n_skbs));
 883                 //atomic_dec(&rxrpc_n_skbs);
 884                 kfree_skb(skb);
 885         }
 886 }
 887
 888 #define rxrpc_free_skb(skb) __rxrpc_free_skb((skb), __func__)
 889
 890 static inline void rxrpc_purge_queue(struct sk_buff_head *list)
 891 {
 892         struct sk_buff *skb;
 893         while ((skb = skb_dequeue((list))) != NULL)
 894                 rxrpc_free_skb(skb);
 895 }
 896
 897 #define rxrpc_get_call(CALL)                            \
 898 do {                                                    \
 899         CHECK_SLAB_OKAY(&(CALL)->usage);                \
 900         if (atomic_inc_return(&(CALL)->usage) == 1)     \
 901                 BUG();                                  \
 902 } while (0)
 903
 904 #define rxrpc_put_call(CALL)                            \
 905 do {                                                    \
 906         __rxrpc_put_call(CALL);                         \
 907 } while (0)