1 /* AF_RXRPC internal definitions 2 * 3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <linux/atomic.h> 13 #include <linux/seqlock.h> 14 #include <net/sock.h> 15 #include <net/af_rxrpc.h> 16 #include <rxrpc/packet.h> 17 18 #if 0 19 #define CHECK_SLAB_OKAY(X) \ 20 BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \ 21 (POISON_FREE << 8 | POISON_FREE)) 22 #else 23 #define CHECK_SLAB_OKAY(X) do {} while (0) 24 #endif 25 26 #define FCRYPT_BSIZE 8 27 struct rxrpc_crypt { 28 union { 29 u8 x[FCRYPT_BSIZE]; 30 __be32 n[2]; 31 }; 32 } __attribute__((aligned(8))); 33 34 #define rxrpc_queue_work(WS) queue_work(rxrpc_workqueue, (WS)) 35 #define rxrpc_queue_delayed_work(WS,D) \ 36 queue_delayed_work(rxrpc_workqueue, (WS), (D)) 37 38 struct rxrpc_connection; 39 40 /* 41 * Mark applied to socket buffers. 42 */ 43 enum rxrpc_skb_mark { 44 RXRPC_SKB_MARK_DATA, /* data message */ 45 RXRPC_SKB_MARK_FINAL_ACK, /* final ACK received message */ 46 RXRPC_SKB_MARK_BUSY, /* server busy message */ 47 RXRPC_SKB_MARK_REMOTE_ABORT, /* remote abort message */ 48 RXRPC_SKB_MARK_LOCAL_ABORT, /* local abort message */ 49 RXRPC_SKB_MARK_NET_ERROR, /* network error message */ 50 RXRPC_SKB_MARK_LOCAL_ERROR, /* local error message */ 51 RXRPC_SKB_MARK_NEW_CALL, /* local error message */ 52 }; 53 54 /* 55 * sk_state for RxRPC sockets 56 */ 57 enum { 58 RXRPC_UNBOUND = 0, 59 RXRPC_CLIENT_UNBOUND, /* Unbound socket used as client */ 60 RXRPC_CLIENT_BOUND, /* client local address bound */ 61 RXRPC_SERVER_BOUND, /* server local address bound */ 62 RXRPC_SERVER_LISTENING, /* server listening for connections */ 63 RXRPC_SERVER_LISTEN_DISABLED, /* server listening disabled */ 64 RXRPC_CLOSE, /* socket is being closed */ 65 }; 66 67 /* 68 * Service backlog preallocation. 69 * 70 * This contains circular buffers of preallocated peers, connections and calls 71 * for incoming service calls and their head and tail pointers. This allows 72 * calls to be set up in the data_ready handler, thereby avoiding the need to 73 * shuffle packets around so much. 74 */ 75 struct rxrpc_backlog { 76 unsigned short peer_backlog_head; 77 unsigned short peer_backlog_tail; 78 unsigned short conn_backlog_head; 79 unsigned short conn_backlog_tail; 80 unsigned short call_backlog_head; 81 unsigned short call_backlog_tail; 82 #define RXRPC_BACKLOG_MAX 32 83 struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX]; 84 struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX]; 85 struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX]; 86 }; 87 88 /* 89 * RxRPC socket definition 90 */ 91 struct rxrpc_sock { 92 /* WARNING: sk has to be the first member */ 93 struct sock sk; 94 rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */ 95 rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */ 96 struct rxrpc_local *local; /* local endpoint */ 97 struct rxrpc_backlog *backlog; /* Preallocation for services */ 98 spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */ 99 struct list_head sock_calls; /* List of calls owned by this socket */ 100 struct list_head to_be_accepted; /* calls awaiting acceptance */ 101 struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */ 102 rwlock_t recvmsg_lock; /* Lock for recvmsg_q */ 103 struct key *key; /* security for this socket */ 104 struct key *securities; /* list of server security descriptors */ 105 struct rb_root calls; /* User ID -> call mapping */ 106 unsigned long flags; 107 #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */ 108 rwlock_t call_lock; /* lock for calls */ 109 u32 min_sec_level; /* minimum security level */ 110 #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT 111 bool exclusive; /* Exclusive connection for a client socket */ 112 sa_family_t family; /* Protocol family created with */ 113 struct sockaddr_rxrpc srx; /* local address */ 114 struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */ 115 }; 116 117 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk) 118 119 /* 120 * CPU-byteorder normalised Rx packet header. 121 */ 122 struct rxrpc_host_header { 123 u32 epoch; /* client boot timestamp */ 124 u32 cid; /* connection and channel ID */ 125 u32 callNumber; /* call ID (0 for connection-level packets) */ 126 u32 seq; /* sequence number of pkt in call stream */ 127 u32 serial; /* serial number of pkt sent to network */ 128 u8 type; /* packet type */ 129 u8 flags; /* packet flags */ 130 u8 userStatus; /* app-layer defined status */ 131 u8 securityIndex; /* security protocol ID */ 132 union { 133 u16 _rsvd; /* reserved */ 134 u16 cksum; /* kerberos security checksum */ 135 }; 136 u16 serviceId; /* service ID */ 137 } __packed; 138 139 /* 140 * RxRPC socket buffer private variables 141 * - max 48 bytes (struct sk_buff::cb) 142 */ 143 struct rxrpc_skb_priv { 144 union { 145 u8 nr_jumbo; /* Number of jumbo subpackets */ 146 }; 147 union { 148 int remain; /* amount of space remaining for next write */ 149 }; 150 151 struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */ 152 }; 153 154 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb) 155 156 /* 157 * RxRPC security module interface 158 */ 159 struct rxrpc_security { 160 const char *name; /* name of this service */ 161 u8 security_index; /* security type provided */ 162 163 /* Initialise a security service */ 164 int (*init)(void); 165 166 /* Clean up a security service */ 167 void (*exit)(void); 168 169 /* initialise a connection's security */ 170 int (*init_connection_security)(struct rxrpc_connection *); 171 172 /* prime a connection's packet security */ 173 int (*prime_packet_security)(struct rxrpc_connection *); 174 175 /* impose security on a packet */ 176 int (*secure_packet)(struct rxrpc_call *, 177 struct sk_buff *, 178 size_t, 179 void *); 180 181 /* verify the security on a received packet */ 182 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *, 183 unsigned int, unsigned int, rxrpc_seq_t, u16); 184 185 /* Locate the data in a received packet that has been verified. */ 186 void (*locate_data)(struct rxrpc_call *, struct sk_buff *, 187 unsigned int *, unsigned int *); 188 189 /* issue a challenge */ 190 int (*issue_challenge)(struct rxrpc_connection *); 191 192 /* respond to a challenge */ 193 int (*respond_to_challenge)(struct rxrpc_connection *, 194 struct sk_buff *, 195 u32 *); 196 197 /* verify a response */ 198 int (*verify_response)(struct rxrpc_connection *, 199 struct sk_buff *, 200 u32 *); 201 202 /* clear connection security */ 203 void (*clear)(struct rxrpc_connection *); 204 }; 205 206 /* 207 * RxRPC local transport endpoint description 208 * - owned by a single AF_RXRPC socket 209 * - pointed to by transport socket struct sk_user_data 210 */ 211 struct rxrpc_local { 212 struct rcu_head rcu; 213 atomic_t usage; 214 struct list_head link; 215 struct socket *socket; /* my UDP socket */ 216 struct work_struct processor; 217 struct rxrpc_sock __rcu *service; /* Service(s) listening on this endpoint */ 218 struct rw_semaphore defrag_sem; /* control re-enablement of IP DF bit */ 219 struct sk_buff_head reject_queue; /* packets awaiting rejection */ 220 struct sk_buff_head event_queue; /* endpoint event packets awaiting processing */ 221 struct rb_root client_conns; /* Client connections by socket params */ 222 spinlock_t client_conns_lock; /* Lock for client_conns */ 223 spinlock_t lock; /* access lock */ 224 rwlock_t services_lock; /* lock for services list */ 225 int debug_id; /* debug ID for printks */ 226 bool dead; 227 struct sockaddr_rxrpc srx; /* local address */ 228 }; 229 230 /* 231 * RxRPC remote transport endpoint definition 232 * - matched by local endpoint, remote port, address and protocol type 233 */ 234 struct rxrpc_peer { 235 struct rcu_head rcu; /* This must be first */ 236 atomic_t usage; 237 unsigned long hash_key; 238 struct hlist_node hash_link; 239 struct rxrpc_local *local; 240 struct hlist_head error_targets; /* targets for net error distribution */ 241 struct work_struct error_distributor; 242 struct rb_root service_conns; /* Service connections */ 243 seqlock_t service_conn_lock; 244 spinlock_t lock; /* access lock */ 245 unsigned int if_mtu; /* interface MTU for this peer */ 246 unsigned int mtu; /* network MTU for this peer */ 247 unsigned int maxdata; /* data size (MTU - hdrsize) */ 248 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */ 249 int debug_id; /* debug ID for printks */ 250 int error_report; /* Net (+0) or local (+1000000) to distribute */ 251 #define RXRPC_LOCAL_ERROR_OFFSET 1000000 252 struct sockaddr_rxrpc srx; /* remote address */ 253 254 /* calculated RTT cache */ 255 #define RXRPC_RTT_CACHE_SIZE 32 256 ktime_t rtt_last_req; /* Time of last RTT request */ 257 u64 rtt; /* Current RTT estimate (in nS) */ 258 u64 rtt_sum; /* Sum of cache contents */ 259 u64 rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */ 260 u8 rtt_cursor; /* next entry at which to insert */ 261 u8 rtt_usage; /* amount of cache actually used */ 262 }; 263 264 /* 265 * Keys for matching a connection. 266 */ 267 struct rxrpc_conn_proto { 268 union { 269 struct { 270 u32 epoch; /* epoch of this connection */ 271 u32 cid; /* connection ID */ 272 }; 273 u64 index_key; 274 }; 275 }; 276 277 struct rxrpc_conn_parameters { 278 struct rxrpc_local *local; /* Representation of local endpoint */ 279 struct rxrpc_peer *peer; /* Remote endpoint */ 280 struct key *key; /* Security details */ 281 bool exclusive; /* T if conn is exclusive */ 282 u16 service_id; /* Service ID for this connection */ 283 u32 security_level; /* Security level selected */ 284 }; 285 286 /* 287 * Bits in the connection flags. 288 */ 289 enum rxrpc_conn_flag { 290 RXRPC_CONN_HAS_IDR, /* Has a client conn ID assigned */ 291 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */ 292 RXRPC_CONN_IN_CLIENT_CONNS, /* Conn is in local->client_conns */ 293 RXRPC_CONN_EXPOSED, /* Conn has extra ref for exposure */ 294 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */ 295 RXRPC_CONN_COUNTED, /* Counted by rxrpc_nr_client_conns */ 296 }; 297 298 /* 299 * Events that can be raised upon a connection. 300 */ 301 enum rxrpc_conn_event { 302 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */ 303 }; 304 305 /* 306 * The connection cache state. 307 */ 308 enum rxrpc_conn_cache_state { 309 RXRPC_CONN_CLIENT_INACTIVE, /* Conn is not yet listed */ 310 RXRPC_CONN_CLIENT_WAITING, /* Conn is on wait list, waiting for capacity */ 311 RXRPC_CONN_CLIENT_ACTIVE, /* Conn is on active list, doing calls */ 312 RXRPC_CONN_CLIENT_CULLED, /* Conn is culled and delisted, doing calls */ 313 RXRPC_CONN_CLIENT_IDLE, /* Conn is on idle list, doing mostly nothing */ 314 RXRPC_CONN__NR_CACHE_STATES 315 }; 316 317 /* 318 * The connection protocol state. 319 */ 320 enum rxrpc_conn_proto_state { 321 RXRPC_CONN_UNUSED, /* Connection not yet attempted */ 322 RXRPC_CONN_CLIENT, /* Client connection */ 323 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */ 324 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */ 325 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */ 326 RXRPC_CONN_SERVICE, /* Service secured connection */ 327 RXRPC_CONN_REMOTELY_ABORTED, /* Conn aborted by peer */ 328 RXRPC_CONN_LOCALLY_ABORTED, /* Conn aborted locally */ 329 RXRPC_CONN__NR_STATES 330 }; 331 332 /* 333 * RxRPC connection definition 334 * - matched by { local, peer, epoch, conn_id, direction } 335 * - each connection can only handle four simultaneous calls 336 */ 337 struct rxrpc_connection { 338 struct rxrpc_conn_proto proto; 339 struct rxrpc_conn_parameters params; 340 341 atomic_t usage; 342 struct rcu_head rcu; 343 struct list_head cache_link; 344 345 spinlock_t channel_lock; 346 unsigned char active_chans; /* Mask of active channels */ 347 #define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1) 348 struct list_head waiting_calls; /* Calls waiting for channels */ 349 struct rxrpc_channel { 350 struct rxrpc_call __rcu *call; /* Active call */ 351 u32 call_id; /* ID of current call */ 352 u32 call_counter; /* Call ID counter */ 353 u32 last_call; /* ID of last call */ 354 u8 last_type; /* Type of last packet */ 355 u16 last_service_id; 356 union { 357 u32 last_seq; 358 u32 last_abort; 359 }; 360 } channels[RXRPC_MAXCALLS]; 361 362 struct work_struct processor; /* connection event processor */ 363 union { 364 struct rb_node client_node; /* Node in local->client_conns */ 365 struct rb_node service_node; /* Node in peer->service_conns */ 366 }; 367 struct list_head proc_link; /* link in procfs list */ 368 struct list_head link; /* link in master connection list */ 369 struct sk_buff_head rx_queue; /* received conn-level packets */ 370 const struct rxrpc_security *security; /* applied security module */ 371 struct key *server_key; /* security for this service */ 372 struct crypto_skcipher *cipher; /* encryption handle */ 373 struct rxrpc_crypt csum_iv; /* packet checksum base */ 374 unsigned long flags; 375 unsigned long events; 376 unsigned long idle_timestamp; /* Time at which last became idle */ 377 spinlock_t state_lock; /* state-change lock */ 378 enum rxrpc_conn_cache_state cache_state; 379 enum rxrpc_conn_proto_state state; /* current state of connection */ 380 u32 local_abort; /* local abort code */ 381 u32 remote_abort; /* remote abort code */ 382 int debug_id; /* debug ID for printks */ 383 atomic_t serial; /* packet serial number counter */ 384 unsigned int hi_serial; /* highest serial number received */ 385 u32 security_nonce; /* response re-use preventer */ 386 u8 size_align; /* data size alignment (for security) */ 387 u8 security_size; /* security header size */ 388 u8 security_ix; /* security type */ 389 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */ 390 }; 391 392 /* 393 * Flags in call->flags. 394 */ 395 enum rxrpc_call_flag { 396 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */ 397 RXRPC_CALL_HAS_USERID, /* has a user ID attached */ 398 RXRPC_CALL_IS_SERVICE, /* Call is service call */ 399 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */ 400 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */ 401 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */ 402 RXRPC_CALL_SEND_PING, /* A ping will need to be sent */ 403 RXRPC_CALL_PINGING, /* Ping in process */ 404 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */ 405 }; 406 407 /* 408 * Events that can be raised on a call. 409 */ 410 enum rxrpc_call_event { 411 RXRPC_CALL_EV_ACK, /* need to generate ACK */ 412 RXRPC_CALL_EV_ABORT, /* need to generate abort */ 413 RXRPC_CALL_EV_TIMER, /* Timer expired */ 414 RXRPC_CALL_EV_RESEND, /* Tx resend required */ 415 RXRPC_CALL_EV_PING, /* Ping send required */ 416 }; 417 418 /* 419 * The states that a call can be in. 420 */ 421 enum rxrpc_call_state { 422 RXRPC_CALL_UNINITIALISED, 423 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */ 424 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */ 425 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */ 426 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */ 427 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */ 428 RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */ 429 RXRPC_CALL_SERVER_ACCEPTING, /* - server accepting request */ 430 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */ 431 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */ 432 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */ 433 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */ 434 RXRPC_CALL_COMPLETE, /* - call complete */ 435 NR__RXRPC_CALL_STATES 436 }; 437 438 /* 439 * Call completion condition (state == RXRPC_CALL_COMPLETE). 440 */ 441 enum rxrpc_call_completion { 442 RXRPC_CALL_SUCCEEDED, /* - Normal termination */ 443 RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */ 444 RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */ 445 RXRPC_CALL_LOCAL_ERROR, /* - call failed due to local error */ 446 RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */ 447 NR__RXRPC_CALL_COMPLETIONS 448 }; 449 450 /* 451 * Call Tx congestion management modes. 452 */ 453 enum rxrpc_congest_mode { 454 RXRPC_CALL_SLOW_START, 455 RXRPC_CALL_CONGEST_AVOIDANCE, 456 RXRPC_CALL_PACKET_LOSS, 457 RXRPC_CALL_FAST_RETRANSMIT, 458 NR__RXRPC_CONGEST_MODES 459 }; 460 461 /* 462 * RxRPC call definition 463 * - matched by { connection, call_id } 464 */ 465 struct rxrpc_call { 466 struct rcu_head rcu; 467 struct rxrpc_connection *conn; /* connection carrying call */ 468 struct rxrpc_peer *peer; /* Peer record for remote address */ 469 struct rxrpc_sock __rcu *socket; /* socket responsible */ 470 ktime_t ack_at; /* When deferred ACK needs to happen */ 471 ktime_t resend_at; /* When next resend needs to happen */ 472 ktime_t ping_at; /* When next to send a ping */ 473 ktime_t expire_at; /* When the call times out */ 474 struct timer_list timer; /* Combined event timer */ 475 struct work_struct processor; /* Event processor */ 476 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */ 477 struct list_head link; /* link in master call list */ 478 struct list_head chan_wait_link; /* Link in conn->waiting_calls */ 479 struct hlist_node error_link; /* link in error distribution list */ 480 struct list_head accept_link; /* Link in rx->acceptq */ 481 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */ 482 struct list_head sock_link; /* Link in rx->sock_calls */ 483 struct rb_node sock_node; /* Node in rx->calls */ 484 struct sk_buff *tx_pending; /* Tx socket buffer being filled */ 485 wait_queue_head_t waitq; /* Wait queue for channel or Tx */ 486 __be32 crypto_buf[2]; /* Temporary packet crypto buffer */ 487 unsigned long user_call_ID; /* user-defined call ID */ 488 unsigned long flags; 489 unsigned long events; 490 spinlock_t lock; 491 rwlock_t state_lock; /* lock for state transition */ 492 u32 abort_code; /* Local/remote abort code */ 493 int error; /* Local error incurred */ 494 enum rxrpc_call_state state; /* current state of call */ 495 enum rxrpc_call_completion completion; /* Call completion condition */ 496 atomic_t usage; 497 u16 service_id; /* service ID */ 498 u8 security_ix; /* Security type */ 499 u32 call_id; /* call ID on connection */ 500 u32 cid; /* connection ID plus channel index */ 501 int debug_id; /* debug ID for printks */ 502 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */ 503 unsigned short rx_pkt_len; /* Current recvmsg packet len */ 504 505 /* Rx/Tx circular buffer, depending on phase. 506 * 507 * In the Rx phase, packets are annotated with 0 or the number of the 508 * segment of a jumbo packet each buffer refers to. There can be up to 509 * 47 segments in a maximum-size UDP packet. 510 * 511 * In the Tx phase, packets are annotated with which buffers have been 512 * acked. 513 */ 514 #define RXRPC_RXTX_BUFF_SIZE 64 515 #define RXRPC_RXTX_BUFF_MASK (RXRPC_RXTX_BUFF_SIZE - 1) 516 #define RXRPC_INIT_RX_WINDOW_SIZE 32 517 struct sk_buff **rxtx_buffer; 518 u8 *rxtx_annotations; 519 #define RXRPC_TX_ANNO_ACK 0 520 #define RXRPC_TX_ANNO_UNACK 1 521 #define RXRPC_TX_ANNO_NAK 2 522 #define RXRPC_TX_ANNO_RETRANS 3 523 #define RXRPC_TX_ANNO_MASK 0x03 524 #define RXRPC_TX_ANNO_LAST 0x04 525 #define RXRPC_TX_ANNO_RESENT 0x08 526 527 #define RXRPC_RX_ANNO_JUMBO 0x3f /* Jumbo subpacket number + 1 if not zero */ 528 #define RXRPC_RX_ANNO_JLAST 0x40 /* Set if last element of a jumbo packet */ 529 #define RXRPC_RX_ANNO_VERIFIED 0x80 /* Set if verified and decrypted */ 530 rxrpc_seq_t tx_hard_ack; /* Dead slot in buffer; the first transmitted but 531 * not hard-ACK'd packet follows this. 532 */ 533 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */ 534 535 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS 536 * is fixed, we keep these numbers in terms of segments (ie. DATA 537 * packets) rather than bytes. 538 */ 539 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN 540 u8 cong_cwnd; /* Congestion window size */ 541 u8 cong_extra; /* Extra to send for congestion management */ 542 u8 cong_ssthresh; /* Slow-start threshold */ 543 enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */ 544 u8 cong_dup_acks; /* Count of ACKs showing missing packets */ 545 u8 cong_cumul_acks; /* Cumulative ACK count */ 546 ktime_t cong_tstamp; /* Last time cwnd was changed */ 547 548 rxrpc_seq_t rx_hard_ack; /* Dead slot in buffer; the first received but not 549 * consumed packet follows this. 550 */ 551 rxrpc_seq_t rx_top; /* Highest Rx slot allocated. */ 552 rxrpc_seq_t rx_expect_next; /* Expected next packet sequence number */ 553 u8 rx_winsize; /* Size of Rx window */ 554 u8 tx_winsize; /* Maximum size of Tx window */ 555 bool tx_phase; /* T if transmission phase, F if receive phase */ 556 u8 nr_jumbo_bad; /* Number of jumbo dups/exceeds-windows */ 557 558 /* receive-phase ACK management */ 559 u8 ackr_reason; /* reason to ACK */ 560 u16 ackr_skew; /* skew on packet being ACK'd */ 561 rxrpc_serial_t ackr_serial; /* serial of packet being ACK'd */ 562 rxrpc_seq_t ackr_prev_seq; /* previous sequence number received */ 563 rxrpc_seq_t ackr_consumed; /* Highest packet shown consumed */ 564 rxrpc_seq_t ackr_seen; /* Highest packet shown seen */ 565 566 /* ping management */ 567 rxrpc_serial_t ping_serial; /* Last ping sent */ 568 ktime_t ping_time; /* Time last ping sent */ 569 570 /* transmission-phase ACK management */ 571 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */ 572 rxrpc_serial_t acks_latest; /* serial number of latest ACK received */ 573 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */ 574 }; 575 576 /* 577 * Summary of a new ACK and the changes it made to the Tx buffer packet states. 578 */ 579 struct rxrpc_ack_summary { 580 u8 ack_reason; 581 u8 nr_acks; /* Number of ACKs in packet */ 582 u8 nr_nacks; /* Number of NACKs in packet */ 583 u8 nr_new_acks; /* Number of new ACKs in packet */ 584 u8 nr_new_nacks; /* Number of new NACKs in packet */ 585 u8 nr_rot_new_acks; /* Number of rotated new ACKs */ 586 bool new_low_nack; /* T if new low NACK found */ 587 bool retrans_timeo; /* T if reTx due to timeout happened */ 588 u8 flight_size; /* Number of unreceived transmissions */ 589 /* Place to stash values for tracing */ 590 enum rxrpc_congest_mode mode:8; 591 u8 cwnd; 592 u8 ssthresh; 593 u8 dup_acks; 594 u8 cumulative_acks; 595 }; 596 597 #include <trace/events/rxrpc.h> 598 599 /* 600 * af_rxrpc.c 601 */ 602 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs; 603 extern u32 rxrpc_epoch; 604 extern atomic_t rxrpc_debug_id; 605 extern struct workqueue_struct *rxrpc_workqueue; 606 607 /* 608 * call_accept.c 609 */ 610 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t); 611 void rxrpc_discard_prealloc(struct rxrpc_sock *); 612 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *, 613 struct rxrpc_connection *, 614 struct sk_buff *); 615 void rxrpc_accept_incoming_calls(struct rxrpc_local *); 616 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long, 617 rxrpc_notify_rx_t); 618 int rxrpc_reject_call(struct rxrpc_sock *); 619 620 /* 621 * call_event.c 622 */ 623 void __rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t); 624 void rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t); 625 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool, 626 enum rxrpc_propose_ack_trace); 627 void rxrpc_process_call(struct work_struct *); 628 629 /* 630 * call_object.c 631 */ 632 extern const char *const rxrpc_call_states[]; 633 extern const char *const rxrpc_call_completions[]; 634 extern unsigned int rxrpc_max_call_lifetime; 635 extern struct kmem_cache *rxrpc_call_jar; 636 extern struct list_head rxrpc_calls; 637 extern rwlock_t rxrpc_call_lock; 638 639 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long); 640 struct rxrpc_call *rxrpc_alloc_call(gfp_t); 641 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *, 642 struct rxrpc_conn_parameters *, 643 struct sockaddr_rxrpc *, 644 unsigned long, gfp_t); 645 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *, 646 struct sk_buff *); 647 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *); 648 void rxrpc_release_calls_on_socket(struct rxrpc_sock *); 649 bool __rxrpc_queue_call(struct rxrpc_call *); 650 bool rxrpc_queue_call(struct rxrpc_call *); 651 void rxrpc_see_call(struct rxrpc_call *); 652 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 653 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace); 654 void rxrpc_cleanup_call(struct rxrpc_call *); 655 void __exit rxrpc_destroy_all_calls(void); 656 657 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call) 658 { 659 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags); 660 } 661 662 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call) 663 { 664 return !rxrpc_is_service_call(call); 665 } 666 667 /* 668 * Transition a call to the complete state. 669 */ 670 static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call, 671 enum rxrpc_call_completion compl, 672 u32 abort_code, 673 int error) 674 { 675 if (call->state < RXRPC_CALL_COMPLETE) { 676 call->abort_code = abort_code; 677 call->error = error; 678 call->completion = compl, 679 call->state = RXRPC_CALL_COMPLETE; 680 wake_up(&call->waitq); 681 return true; 682 } 683 return false; 684 } 685 686 static inline bool rxrpc_set_call_completion(struct rxrpc_call *call, 687 enum rxrpc_call_completion compl, 688 u32 abort_code, 689 int error) 690 { 691 bool ret; 692 693 write_lock_bh(&call->state_lock); 694 ret = __rxrpc_set_call_completion(call, compl, abort_code, error); 695 write_unlock_bh(&call->state_lock); 696 return ret; 697 } 698 699 /* 700 * Record that a call successfully completed. 701 */ 702 static inline bool __rxrpc_call_completed(struct rxrpc_call *call) 703 { 704 return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0); 705 } 706 707 static inline bool rxrpc_call_completed(struct rxrpc_call *call) 708 { 709 bool ret; 710 711 write_lock_bh(&call->state_lock); 712 ret = __rxrpc_call_completed(call); 713 write_unlock_bh(&call->state_lock); 714 return ret; 715 } 716 717 /* 718 * Record that a call is locally aborted. 719 */ 720 static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call, 721 rxrpc_seq_t seq, 722 u32 abort_code, int error) 723 { 724 trace_rxrpc_abort(why, call->cid, call->call_id, seq, 725 abort_code, error); 726 return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED, 727 abort_code, error); 728 } 729 730 static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call, 731 rxrpc_seq_t seq, u32 abort_code, int error) 732 { 733 bool ret; 734 735 write_lock_bh(&call->state_lock); 736 ret = __rxrpc_abort_call(why, call, seq, abort_code, error); 737 write_unlock_bh(&call->state_lock); 738 return ret; 739 } 740 741 /* 742 * conn_client.c 743 */ 744 extern unsigned int rxrpc_max_client_connections; 745 extern unsigned int rxrpc_reap_client_connections; 746 extern unsigned int rxrpc_conn_idle_client_expiry; 747 extern unsigned int rxrpc_conn_idle_client_fast_expiry; 748 extern struct idr rxrpc_client_conn_ids; 749 750 void rxrpc_destroy_client_conn_ids(void); 751 int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *, 752 struct sockaddr_rxrpc *, gfp_t); 753 void rxrpc_expose_client_call(struct rxrpc_call *); 754 void rxrpc_disconnect_client_call(struct rxrpc_call *); 755 void rxrpc_put_client_conn(struct rxrpc_connection *); 756 void __exit rxrpc_destroy_all_client_connections(void); 757 758 /* 759 * conn_event.c 760 */ 761 void rxrpc_process_connection(struct work_struct *); 762 763 /* 764 * conn_object.c 765 */ 766 extern unsigned int rxrpc_connection_expiry; 767 extern struct list_head rxrpc_connections; 768 extern struct list_head rxrpc_connection_proc_list; 769 extern rwlock_t rxrpc_connection_lock; 770 771 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *); 772 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t); 773 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *, 774 struct sk_buff *); 775 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *); 776 void rxrpc_disconnect_call(struct rxrpc_call *); 777 void rxrpc_kill_connection(struct rxrpc_connection *); 778 bool rxrpc_queue_conn(struct rxrpc_connection *); 779 void rxrpc_see_connection(struct rxrpc_connection *); 780 void rxrpc_get_connection(struct rxrpc_connection *); 781 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *); 782 void rxrpc_put_service_conn(struct rxrpc_connection *); 783 void __exit rxrpc_destroy_all_connections(void); 784 785 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn) 786 { 787 return conn->out_clientflag; 788 } 789 790 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn) 791 { 792 return !rxrpc_conn_is_client(conn); 793 } 794 795 static inline void rxrpc_put_connection(struct rxrpc_connection *conn) 796 { 797 if (!conn) 798 return; 799 800 if (rxrpc_conn_is_client(conn)) 801 rxrpc_put_client_conn(conn); 802 else 803 rxrpc_put_service_conn(conn); 804 } 805 806 /* 807 * conn_service.c 808 */ 809 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *, 810 struct sk_buff *); 811 struct rxrpc_connection *rxrpc_prealloc_service_connection(gfp_t); 812 void rxrpc_new_incoming_connection(struct rxrpc_connection *, struct sk_buff *); 813 void rxrpc_unpublish_service_conn(struct rxrpc_connection *); 814 815 /* 816 * input.c 817 */ 818 void rxrpc_data_ready(struct sock *); 819 820 /* 821 * insecure.c 822 */ 823 extern const struct rxrpc_security rxrpc_no_security; 824 825 /* 826 * key.c 827 */ 828 extern struct key_type key_type_rxrpc; 829 extern struct key_type key_type_rxrpc_s; 830 831 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int); 832 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int); 833 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time_t, 834 u32); 835 836 /* 837 * local_event.c 838 */ 839 extern void rxrpc_process_local_events(struct rxrpc_local *); 840 841 /* 842 * local_object.c 843 */ 844 struct rxrpc_local *rxrpc_lookup_local(const struct sockaddr_rxrpc *); 845 void __rxrpc_put_local(struct rxrpc_local *); 846 void __exit rxrpc_destroy_all_locals(void); 847 848 static inline void rxrpc_get_local(struct rxrpc_local *local) 849 { 850 atomic_inc(&local->usage); 851 } 852 853 static inline 854 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local) 855 { 856 return atomic_inc_not_zero(&local->usage) ? local : NULL; 857 } 858 859 static inline void rxrpc_put_local(struct rxrpc_local *local) 860 { 861 if (local && atomic_dec_and_test(&local->usage)) 862 __rxrpc_put_local(local); 863 } 864 865 static inline void rxrpc_queue_local(struct rxrpc_local *local) 866 { 867 rxrpc_queue_work(&local->processor); 868 } 869 870 /* 871 * misc.c 872 */ 873 extern unsigned int rxrpc_max_backlog __read_mostly; 874 extern unsigned int rxrpc_requested_ack_delay; 875 extern unsigned int rxrpc_soft_ack_delay; 876 extern unsigned int rxrpc_idle_ack_delay; 877 extern unsigned int rxrpc_rx_window_size; 878 extern unsigned int rxrpc_rx_mtu; 879 extern unsigned int rxrpc_rx_jumbo_max; 880 extern unsigned int rxrpc_resend_timeout; 881 882 extern const s8 rxrpc_ack_priority[]; 883 884 /* 885 * output.c 886 */ 887 int rxrpc_send_ack_packet(struct rxrpc_call *, bool); 888 int rxrpc_send_abort_packet(struct rxrpc_call *); 889 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool); 890 void rxrpc_reject_packets(struct rxrpc_local *); 891 892 /* 893 * peer_event.c 894 */ 895 void rxrpc_error_report(struct sock *); 896 void rxrpc_peer_error_distributor(struct work_struct *); 897 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, 898 rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t); 899 900 /* 901 * peer_object.c 902 */ 903 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *, 904 const struct sockaddr_rxrpc *); 905 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *, 906 struct sockaddr_rxrpc *, gfp_t); 907 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t); 908 struct rxrpc_peer *rxrpc_lookup_incoming_peer(struct rxrpc_local *, 909 struct rxrpc_peer *); 910 911 static inline struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer) 912 { 913 atomic_inc(&peer->usage); 914 return peer; 915 } 916 917 static inline 918 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer) 919 { 920 return atomic_inc_not_zero(&peer->usage) ? peer : NULL; 921 } 922 923 extern void __rxrpc_put_peer(struct rxrpc_peer *peer); 924 static inline void rxrpc_put_peer(struct rxrpc_peer *peer) 925 { 926 if (peer && atomic_dec_and_test(&peer->usage)) 927 __rxrpc_put_peer(peer); 928 } 929 930 /* 931 * proc.c 932 */ 933 extern const struct file_operations rxrpc_call_seq_fops; 934 extern const struct file_operations rxrpc_connection_seq_fops; 935 936 /* 937 * recvmsg.c 938 */ 939 void rxrpc_notify_socket(struct rxrpc_call *); 940 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int); 941 942 /* 943 * rxkad.c 944 */ 945 #ifdef CONFIG_RXKAD 946 extern const struct rxrpc_security rxkad; 947 #endif 948 949 /* 950 * security.c 951 */ 952 int __init rxrpc_init_security(void); 953 void rxrpc_exit_security(void); 954 int rxrpc_init_client_conn_security(struct rxrpc_connection *); 955 int rxrpc_init_server_conn_security(struct rxrpc_connection *); 956 957 /* 958 * sendmsg.c 959 */ 960 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t); 961 962 /* 963 * skbuff.c 964 */ 965 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *); 966 void rxrpc_packet_destructor(struct sk_buff *); 967 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace); 968 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace); 969 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace); 970 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace); 971 void rxrpc_lose_skb(struct sk_buff *, enum rxrpc_skb_trace); 972 void rxrpc_purge_queue(struct sk_buff_head *); 973 974 /* 975 * sysctl.c 976 */ 977 #ifdef CONFIG_SYSCTL 978 extern int __init rxrpc_sysctl_init(void); 979 extern void rxrpc_sysctl_exit(void); 980 #else 981 static inline int __init rxrpc_sysctl_init(void) { return 0; } 982 static inline void rxrpc_sysctl_exit(void) {} 983 #endif 984 985 /* 986 * utils.c 987 */ 988 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *); 989 990 static inline bool before(u32 seq1, u32 seq2) 991 { 992 return (s32)(seq1 - seq2) < 0; 993 } 994 static inline bool before_eq(u32 seq1, u32 seq2) 995 { 996 return (s32)(seq1 - seq2) <= 0; 997 } 998 static inline bool after(u32 seq1, u32 seq2) 999 { 1000 return (s32)(seq1 - seq2) > 0; 1001 } 1002 static inline bool after_eq(u32 seq1, u32 seq2) 1003 { 1004 return (s32)(seq1 - seq2) >= 0; 1005 } 1006 1007 /* 1008 * debug tracing 1009 */ 1010 extern unsigned int rxrpc_debug; 1011 1012 #define dbgprintk(FMT,...) \ 1013 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1014 1015 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1016 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1017 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1018 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__) 1019 #define knet(FMT,...) dbgprintk("@@@ "FMT ,##__VA_ARGS__) 1020 1021 1022 #if defined(__KDEBUG) 1023 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1024 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1025 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1026 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__) 1027 #define _net(FMT,...) knet(FMT,##__VA_ARGS__) 1028 1029 #elif defined(CONFIG_AF_RXRPC_DEBUG) 1030 #define RXRPC_DEBUG_KENTER 0x01 1031 #define RXRPC_DEBUG_KLEAVE 0x02 1032 #define RXRPC_DEBUG_KDEBUG 0x04 1033 #define RXRPC_DEBUG_KPROTO 0x08 1034 #define RXRPC_DEBUG_KNET 0x10 1035 1036 #define _enter(FMT,...) \ 1037 do { \ 1038 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \ 1039 kenter(FMT,##__VA_ARGS__); \ 1040 } while (0) 1041 1042 #define _leave(FMT,...) \ 1043 do { \ 1044 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \ 1045 kleave(FMT,##__VA_ARGS__); \ 1046 } while (0) 1047 1048 #define _debug(FMT,...) \ 1049 do { \ 1050 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \ 1051 kdebug(FMT,##__VA_ARGS__); \ 1052 } while (0) 1053 1054 #define _proto(FMT,...) \ 1055 do { \ 1056 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \ 1057 kproto(FMT,##__VA_ARGS__); \ 1058 } while (0) 1059 1060 #define _net(FMT,...) \ 1061 do { \ 1062 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET)) \ 1063 knet(FMT,##__VA_ARGS__); \ 1064 } while (0) 1065 1066 #else 1067 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1068 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1069 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1070 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__) 1071 #define _net(FMT,...) no_printk("@@@ "FMT ,##__VA_ARGS__) 1072 #endif 1073 1074 /* 1075 * debug assertion checking 1076 */ 1077 #if 1 // defined(__KDEBUGALL) 1078 1079 #define ASSERT(X) \ 1080 do { \ 1081 if (unlikely(!(X))) { \ 1082 pr_err("Assertion failed\n"); \ 1083 BUG(); \ 1084 } \ 1085 } while (0) 1086 1087 #define ASSERTCMP(X, OP, Y) \ 1088 do { \ 1089 __typeof__(X) _x = (X); \ 1090 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1091 if (unlikely(!(_x OP _y))) { \ 1092 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1093 (unsigned long)_x, (unsigned long)_x, #OP, \ 1094 (unsigned long)_y, (unsigned long)_y); \ 1095 BUG(); \ 1096 } \ 1097 } while (0) 1098 1099 #define ASSERTIF(C, X) \ 1100 do { \ 1101 if (unlikely((C) && !(X))) { \ 1102 pr_err("Assertion failed\n"); \ 1103 BUG(); \ 1104 } \ 1105 } while (0) 1106 1107 #define ASSERTIFCMP(C, X, OP, Y) \ 1108 do { \ 1109 __typeof__(X) _x = (X); \ 1110 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1111 if (unlikely((C) && !(_x OP _y))) { \ 1112 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1113 (unsigned long)_x, (unsigned long)_x, #OP, \ 1114 (unsigned long)_y, (unsigned long)_y); \ 1115 BUG(); \ 1116 } \ 1117 } while (0) 1118 1119 #else 1120 1121 #define ASSERT(X) \ 1122 do { \ 1123 } while (0) 1124 1125 #define ASSERTCMP(X, OP, Y) \ 1126 do { \ 1127 } while (0) 1128 1129 #define ASSERTIF(C, X) \ 1130 do { \ 1131 } while (0) 1132 1133 #define ASSERTIFCMP(C, X, OP, Y) \ 1134 do { \ 1135 } while (0) 1136 1137 #endif /* __KDEBUGALL */ 1138