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 <linux/win_minmax.h> 11 #include <net/net_namespace.h> 12 #include <net/netns/generic.h> 13 #include <net/sock.h> 14 #include <net/af_rxrpc.h> 15 #include <keys/rxrpc-type.h> 16 #include "protocol.h" 17 18 #define FCRYPT_BSIZE 8 19 struct rxrpc_crypt { 20 union { 21 u8 x[FCRYPT_BSIZE]; 22 __be32 n[2]; 23 }; 24 } __attribute__((aligned(8))); 25 26 #define rxrpc_queue_work(WS) queue_work(rxrpc_workqueue, (WS)) 27 #define rxrpc_queue_delayed_work(WS,D) \ 28 queue_delayed_work(rxrpc_workqueue, (WS), (D)) 29 30 struct key_preparsed_payload; 31 struct rxrpc_connection; 32 struct rxrpc_txbuf; 33 34 /* 35 * Mark applied to socket buffers in skb->mark. skb->priority is used 36 * to pass supplementary information. 37 */ 38 enum rxrpc_skb_mark { 39 RXRPC_SKB_MARK_PACKET, /* Received packet */ 40 RXRPC_SKB_MARK_ERROR, /* Error notification */ 41 RXRPC_SKB_MARK_REJECT_BUSY, /* Reject with BUSY */ 42 RXRPC_SKB_MARK_REJECT_ABORT, /* Reject with ABORT (code in skb->priority) */ 43 }; 44 45 /* 46 * sk_state for RxRPC sockets 47 */ 48 enum { 49 RXRPC_UNBOUND = 0, 50 RXRPC_CLIENT_UNBOUND, /* Unbound socket used as client */ 51 RXRPC_CLIENT_BOUND, /* client local address bound */ 52 RXRPC_SERVER_BOUND, /* server local address bound */ 53 RXRPC_SERVER_BOUND2, /* second server local address bound */ 54 RXRPC_SERVER_LISTENING, /* server listening for connections */ 55 RXRPC_SERVER_LISTEN_DISABLED, /* server listening disabled */ 56 RXRPC_CLOSE, /* socket is being closed */ 57 }; 58 59 /* 60 * Per-network namespace data. 61 */ 62 struct rxrpc_net { 63 struct proc_dir_entry *proc_net; /* Subdir in /proc/net */ 64 u32 epoch; /* Local epoch for detecting local-end reset */ 65 struct list_head calls; /* List of calls active in this namespace */ 66 spinlock_t call_lock; /* Lock for ->calls */ 67 atomic_t nr_calls; /* Count of allocated calls */ 68 69 atomic_t nr_conns; 70 struct list_head conn_proc_list; /* List of conns in this namespace for proc */ 71 struct list_head service_conns; /* Service conns in this namespace */ 72 rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */ 73 struct work_struct service_conn_reaper; 74 struct timer_list service_conn_reap_timer; 75 76 bool live; 77 78 bool kill_all_client_conns; 79 atomic_t nr_client_conns; 80 spinlock_t client_conn_cache_lock; /* Lock for ->*_client_conns */ 81 struct mutex client_conn_discard_lock; /* Prevent multiple discarders */ 82 struct list_head idle_client_conns; 83 struct work_struct client_conn_reaper; 84 struct timer_list client_conn_reap_timer; 85 86 struct hlist_head local_endpoints; 87 struct mutex local_mutex; /* Lock for ->local_endpoints */ 88 89 DECLARE_HASHTABLE (peer_hash, 10); 90 spinlock_t peer_hash_lock; /* Lock for ->peer_hash */ 91 92 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */ 93 u8 peer_keepalive_cursor; 94 time64_t peer_keepalive_base; 95 struct list_head peer_keepalive[32]; 96 struct list_head peer_keepalive_new; 97 struct timer_list peer_keepalive_timer; 98 struct work_struct peer_keepalive_work; 99 100 atomic_t stat_tx_data; 101 atomic_t stat_tx_data_retrans; 102 atomic_t stat_tx_data_send; 103 atomic_t stat_tx_data_send_frag; 104 atomic_t stat_tx_data_send_fail; 105 atomic_t stat_tx_data_underflow; 106 atomic_t stat_tx_data_cwnd_reset; 107 atomic_t stat_rx_data; 108 atomic_t stat_rx_data_reqack; 109 atomic_t stat_rx_data_jumbo; 110 111 atomic_t stat_tx_ack_fill; 112 atomic_t stat_tx_ack_send; 113 atomic_t stat_tx_ack_skip; 114 atomic_t stat_tx_acks[256]; 115 atomic_t stat_rx_acks[256]; 116 117 atomic_t stat_why_req_ack[8]; 118 119 atomic_t stat_io_loop; 120 }; 121 122 /* 123 * Service backlog preallocation. 124 * 125 * This contains circular buffers of preallocated peers, connections and calls 126 * for incoming service calls and their head and tail pointers. This allows 127 * calls to be set up in the data_ready handler, thereby avoiding the need to 128 * shuffle packets around so much. 129 */ 130 struct rxrpc_backlog { 131 unsigned short peer_backlog_head; 132 unsigned short peer_backlog_tail; 133 unsigned short conn_backlog_head; 134 unsigned short conn_backlog_tail; 135 unsigned short call_backlog_head; 136 unsigned short call_backlog_tail; 137 #define RXRPC_BACKLOG_MAX 32 138 struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX]; 139 struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX]; 140 struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX]; 141 }; 142 143 /* 144 * RxRPC socket definition 145 */ 146 struct rxrpc_sock { 147 /* WARNING: sk has to be the first member */ 148 struct sock sk; 149 rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */ 150 rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */ 151 struct rxrpc_local *local; /* local endpoint */ 152 struct rxrpc_backlog *backlog; /* Preallocation for services */ 153 spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */ 154 struct list_head sock_calls; /* List of calls owned by this socket */ 155 struct list_head to_be_accepted; /* calls awaiting acceptance */ 156 struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */ 157 rwlock_t recvmsg_lock; /* Lock for recvmsg_q */ 158 struct key *key; /* security for this socket */ 159 struct key *securities; /* list of server security descriptors */ 160 struct rb_root calls; /* User ID -> call mapping */ 161 unsigned long flags; 162 #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */ 163 rwlock_t call_lock; /* lock for calls */ 164 u32 min_sec_level; /* minimum security level */ 165 #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT 166 bool exclusive; /* Exclusive connection for a client socket */ 167 u16 second_service; /* Additional service bound to the endpoint */ 168 struct { 169 /* Service upgrade information */ 170 u16 from; /* Service ID to upgrade (if not 0) */ 171 u16 to; /* service ID to upgrade to */ 172 } service_upgrade; 173 sa_family_t family; /* Protocol family created with */ 174 struct sockaddr_rxrpc srx; /* Primary Service/local addresses */ 175 struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */ 176 }; 177 178 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk) 179 180 /* 181 * CPU-byteorder normalised Rx packet header. 182 */ 183 struct rxrpc_host_header { 184 u32 epoch; /* client boot timestamp */ 185 u32 cid; /* connection and channel ID */ 186 u32 callNumber; /* call ID (0 for connection-level packets) */ 187 u32 seq; /* sequence number of pkt in call stream */ 188 u32 serial; /* serial number of pkt sent to network */ 189 u8 type; /* packet type */ 190 u8 flags; /* packet flags */ 191 u8 userStatus; /* app-layer defined status */ 192 u8 securityIndex; /* security protocol ID */ 193 union { 194 u16 _rsvd; /* reserved */ 195 u16 cksum; /* kerberos security checksum */ 196 }; 197 u16 serviceId; /* service ID */ 198 } __packed; 199 200 /* 201 * RxRPC socket buffer private variables 202 * - max 48 bytes (struct sk_buff::cb) 203 */ 204 struct rxrpc_skb_priv { 205 struct rxrpc_connection *conn; /* Connection referred to (poke packet) */ 206 u16 offset; /* Offset of data */ 207 u16 len; /* Length of data */ 208 u8 flags; 209 #define RXRPC_RX_VERIFIED 0x01 210 211 struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */ 212 }; 213 214 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb) 215 216 /* 217 * RxRPC security module interface 218 */ 219 struct rxrpc_security { 220 const char *name; /* name of this service */ 221 u8 security_index; /* security type provided */ 222 u32 no_key_abort; /* Abort code indicating no key */ 223 224 /* Initialise a security service */ 225 int (*init)(void); 226 227 /* Clean up a security service */ 228 void (*exit)(void); 229 230 /* Parse the information from a server key */ 231 int (*preparse_server_key)(struct key_preparsed_payload *); 232 233 /* Clean up the preparse buffer after parsing a server key */ 234 void (*free_preparse_server_key)(struct key_preparsed_payload *); 235 236 /* Destroy the payload of a server key */ 237 void (*destroy_server_key)(struct key *); 238 239 /* Describe a server key */ 240 void (*describe_server_key)(const struct key *, struct seq_file *); 241 242 /* initialise a connection's security */ 243 int (*init_connection_security)(struct rxrpc_connection *, 244 struct rxrpc_key_token *); 245 246 /* Work out how much data we can store in a packet, given an estimate 247 * of the amount of data remaining. 248 */ 249 int (*how_much_data)(struct rxrpc_call *, size_t, 250 size_t *, size_t *, size_t *); 251 252 /* impose security on a packet */ 253 int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *); 254 255 /* verify the security on a received packet */ 256 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *); 257 258 /* Free crypto request on a call */ 259 void (*free_call_crypto)(struct rxrpc_call *); 260 261 /* issue a challenge */ 262 int (*issue_challenge)(struct rxrpc_connection *); 263 264 /* respond to a challenge */ 265 int (*respond_to_challenge)(struct rxrpc_connection *, 266 struct sk_buff *, 267 u32 *); 268 269 /* verify a response */ 270 int (*verify_response)(struct rxrpc_connection *, 271 struct sk_buff *, 272 u32 *); 273 274 /* clear connection security */ 275 void (*clear)(struct rxrpc_connection *); 276 }; 277 278 /* 279 * RxRPC local transport endpoint description 280 * - owned by a single AF_RXRPC socket 281 * - pointed to by transport socket struct sk_user_data 282 */ 283 struct rxrpc_local { 284 struct rcu_head rcu; 285 atomic_t active_users; /* Number of users of the local endpoint */ 286 refcount_t ref; /* Number of references to the structure */ 287 struct net *net; /* The network namespace */ 288 struct rxrpc_net *rxnet; /* Our bits in the network namespace */ 289 struct hlist_node link; 290 struct socket *socket; /* my UDP socket */ 291 struct task_struct *io_thread; 292 struct completion io_thread_ready; /* Indication that the I/O thread started */ 293 struct rxrpc_sock __rcu *service; /* Service(s) listening on this endpoint */ 294 struct rw_semaphore defrag_sem; /* control re-enablement of IP DF bit */ 295 struct sk_buff_head rx_queue; /* Received packets */ 296 struct list_head conn_attend_q; /* Conns requiring immediate attention */ 297 struct list_head call_attend_q; /* Calls requiring immediate attention */ 298 struct rb_root client_bundles; /* Client connection bundles by socket params */ 299 spinlock_t client_bundles_lock; /* Lock for client_bundles */ 300 spinlock_t lock; /* access lock */ 301 rwlock_t services_lock; /* lock for services list */ 302 int debug_id; /* debug ID for printks */ 303 bool dead; 304 bool service_closed; /* Service socket closed */ 305 struct sockaddr_rxrpc srx; /* local address */ 306 }; 307 308 /* 309 * RxRPC remote transport endpoint definition 310 * - matched by local endpoint, remote port, address and protocol type 311 */ 312 struct rxrpc_peer { 313 struct rcu_head rcu; /* This must be first */ 314 refcount_t ref; 315 unsigned long hash_key; 316 struct hlist_node hash_link; 317 struct rxrpc_local *local; 318 struct hlist_head error_targets; /* targets for net error distribution */ 319 struct rb_root service_conns; /* Service connections */ 320 struct list_head keepalive_link; /* Link in net->peer_keepalive[] */ 321 time64_t last_tx_at; /* Last time packet sent here */ 322 seqlock_t service_conn_lock; 323 spinlock_t lock; /* access lock */ 324 unsigned int if_mtu; /* interface MTU for this peer */ 325 unsigned int mtu; /* network MTU for this peer */ 326 unsigned int maxdata; /* data size (MTU - hdrsize) */ 327 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */ 328 int debug_id; /* debug ID for printks */ 329 struct sockaddr_rxrpc srx; /* remote address */ 330 331 /* calculated RTT cache */ 332 #define RXRPC_RTT_CACHE_SIZE 32 333 spinlock_t rtt_input_lock; /* RTT lock for input routine */ 334 ktime_t rtt_last_req; /* Time of last RTT request */ 335 unsigned int rtt_count; /* Number of samples we've got */ 336 337 u32 srtt_us; /* smoothed round trip time << 3 in usecs */ 338 u32 mdev_us; /* medium deviation */ 339 u32 mdev_max_us; /* maximal mdev for the last rtt period */ 340 u32 rttvar_us; /* smoothed mdev_max */ 341 u32 rto_j; /* Retransmission timeout in jiffies */ 342 u8 backoff; /* Backoff timeout */ 343 344 u8 cong_ssthresh; /* Congestion slow-start threshold */ 345 }; 346 347 /* 348 * Keys for matching a connection. 349 */ 350 struct rxrpc_conn_proto { 351 union { 352 struct { 353 u32 epoch; /* epoch of this connection */ 354 u32 cid; /* connection ID */ 355 }; 356 u64 index_key; 357 }; 358 }; 359 360 struct rxrpc_conn_parameters { 361 struct rxrpc_local *local; /* Representation of local endpoint */ 362 struct rxrpc_peer *peer; /* Remote endpoint */ 363 struct key *key; /* Security details */ 364 bool exclusive; /* T if conn is exclusive */ 365 bool upgrade; /* T if service ID can be upgraded */ 366 u16 service_id; /* Service ID for this connection */ 367 u32 security_level; /* Security level selected */ 368 }; 369 370 /* 371 * Bits in the connection flags. 372 */ 373 enum rxrpc_conn_flag { 374 RXRPC_CONN_HAS_IDR, /* Has a client conn ID assigned */ 375 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */ 376 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */ 377 RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */ 378 RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */ 379 RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */ 380 RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */ 381 RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */ 382 }; 383 384 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \ 385 (1UL << RXRPC_CONN_FINAL_ACK_1) | \ 386 (1UL << RXRPC_CONN_FINAL_ACK_2) | \ 387 (1UL << RXRPC_CONN_FINAL_ACK_3)) 388 389 /* 390 * Events that can be raised upon a connection. 391 */ 392 enum rxrpc_conn_event { 393 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */ 394 }; 395 396 /* 397 * The connection protocol state. 398 */ 399 enum rxrpc_conn_proto_state { 400 RXRPC_CONN_UNUSED, /* Connection not yet attempted */ 401 RXRPC_CONN_CLIENT, /* Client connection */ 402 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */ 403 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */ 404 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */ 405 RXRPC_CONN_SERVICE, /* Service secured connection */ 406 RXRPC_CONN_REMOTELY_ABORTED, /* Conn aborted by peer */ 407 RXRPC_CONN_LOCALLY_ABORTED, /* Conn aborted locally */ 408 RXRPC_CONN__NR_STATES 409 }; 410 411 /* 412 * RxRPC client connection bundle. 413 */ 414 struct rxrpc_bundle { 415 struct rxrpc_local *local; /* Representation of local endpoint */ 416 struct rxrpc_peer *peer; /* Remote endpoint */ 417 struct key *key; /* Security details */ 418 refcount_t ref; 419 atomic_t active; /* Number of active users */ 420 unsigned int debug_id; 421 u32 security_level; /* Security level selected */ 422 u16 service_id; /* Service ID for this connection */ 423 bool try_upgrade; /* True if the bundle is attempting upgrade */ 424 bool alloc_conn; /* True if someone's getting a conn */ 425 bool exclusive; /* T if conn is exclusive */ 426 bool upgrade; /* T if service ID can be upgraded */ 427 short alloc_error; /* Error from last conn allocation */ 428 spinlock_t channel_lock; 429 struct rb_node local_node; /* Node in local->client_conns */ 430 struct list_head waiting_calls; /* Calls waiting for channels */ 431 unsigned long avail_chans; /* Mask of available channels */ 432 struct rxrpc_connection *conns[4]; /* The connections in the bundle (max 4) */ 433 }; 434 435 /* 436 * RxRPC connection definition 437 * - matched by { local, peer, epoch, conn_id, direction } 438 * - each connection can only handle four simultaneous calls 439 */ 440 struct rxrpc_connection { 441 struct rxrpc_conn_proto proto; 442 struct rxrpc_local *local; /* Representation of local endpoint */ 443 struct rxrpc_peer *peer; /* Remote endpoint */ 444 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ 445 struct key *key; /* Security details */ 446 struct list_head attend_link; /* Link in local->conn_attend_q */ 447 448 refcount_t ref; 449 atomic_t active; /* Active count for service conns */ 450 struct rcu_head rcu; 451 struct list_head cache_link; 452 453 unsigned char act_chans; /* Mask of active channels */ 454 struct rxrpc_channel { 455 unsigned long final_ack_at; /* Time at which to issue final ACK */ 456 struct rxrpc_call __rcu *call; /* Active call */ 457 unsigned int call_debug_id; /* call->debug_id */ 458 u32 call_id; /* ID of current call */ 459 u32 call_counter; /* Call ID counter */ 460 u32 last_call; /* ID of last call */ 461 u8 last_type; /* Type of last packet */ 462 union { 463 u32 last_seq; 464 u32 last_abort; 465 }; 466 } channels[RXRPC_MAXCALLS]; 467 468 struct timer_list timer; /* Conn event timer */ 469 struct work_struct processor; /* connection event processor */ 470 struct work_struct destructor; /* In-process-context destroyer */ 471 struct rxrpc_bundle *bundle; /* Client connection bundle */ 472 struct rb_node service_node; /* Node in peer->service_conns */ 473 struct list_head proc_link; /* link in procfs list */ 474 struct list_head link; /* link in master connection list */ 475 struct sk_buff_head rx_queue; /* received conn-level packets */ 476 477 const struct rxrpc_security *security; /* applied security module */ 478 union { 479 struct { 480 struct crypto_sync_skcipher *cipher; /* encryption handle */ 481 struct rxrpc_crypt csum_iv; /* packet checksum base */ 482 u32 nonce; /* response re-use preventer */ 483 } rxkad; 484 }; 485 unsigned long flags; 486 unsigned long events; 487 unsigned long idle_timestamp; /* Time at which last became idle */ 488 spinlock_t state_lock; /* state-change lock */ 489 enum rxrpc_conn_proto_state state; /* current state of connection */ 490 u32 abort_code; /* Abort code of connection abort */ 491 int debug_id; /* debug ID for printks */ 492 atomic_t serial; /* packet serial number counter */ 493 unsigned int hi_serial; /* highest serial number received */ 494 u32 service_id; /* Service ID, possibly upgraded */ 495 u32 security_level; /* Security level selected */ 496 u8 security_ix; /* security type */ 497 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */ 498 u8 bundle_shift; /* Index into bundle->avail_chans */ 499 bool exclusive; /* T if conn is exclusive */ 500 bool upgrade; /* T if service ID can be upgraded */ 501 u16 orig_service_id; /* Originally requested service ID */ 502 short error; /* Local error code */ 503 }; 504 505 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp) 506 { 507 return sp->hdr.flags & RXRPC_CLIENT_INITIATED; 508 } 509 510 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp) 511 { 512 return !rxrpc_to_server(sp); 513 } 514 515 /* 516 * Flags in call->flags. 517 */ 518 enum rxrpc_call_flag { 519 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */ 520 RXRPC_CALL_HAS_USERID, /* has a user ID attached */ 521 RXRPC_CALL_IS_SERVICE, /* Call is service call */ 522 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */ 523 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */ 524 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */ 525 RXRPC_CALL_TX_ALL_ACKED, /* Last packet has been hard-acked */ 526 RXRPC_CALL_SEND_PING, /* A ping will need to be sent */ 527 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */ 528 RXRPC_CALL_BEGAN_RX_TIMER, /* We began the expect_rx_by timer */ 529 RXRPC_CALL_RX_HEARD, /* The peer responded at least once to this call */ 530 RXRPC_CALL_DISCONNECTED, /* The call has been disconnected */ 531 RXRPC_CALL_KERNEL, /* The call was made by the kernel */ 532 RXRPC_CALL_UPGRADE, /* Service upgrade was requested for the call */ 533 RXRPC_CALL_EXCLUSIVE, /* The call uses a once-only connection */ 534 RXRPC_CALL_RX_IS_IDLE, /* Reception is idle - send an ACK */ 535 }; 536 537 /* 538 * Events that can be raised on a call. 539 */ 540 enum rxrpc_call_event { 541 RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */ 542 RXRPC_CALL_EV_INITIAL_PING, /* Send initial ping for a new service call */ 543 }; 544 545 /* 546 * The states that a call can be in. 547 */ 548 enum rxrpc_call_state { 549 RXRPC_CALL_UNINITIALISED, 550 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */ 551 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */ 552 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */ 553 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */ 554 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */ 555 RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */ 556 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */ 557 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */ 558 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */ 559 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */ 560 RXRPC_CALL_COMPLETE, /* - call complete */ 561 NR__RXRPC_CALL_STATES 562 }; 563 564 /* 565 * Call completion condition (state == RXRPC_CALL_COMPLETE). 566 */ 567 enum rxrpc_call_completion { 568 RXRPC_CALL_SUCCEEDED, /* - Normal termination */ 569 RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */ 570 RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */ 571 RXRPC_CALL_LOCAL_ERROR, /* - call failed due to local error */ 572 RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */ 573 NR__RXRPC_CALL_COMPLETIONS 574 }; 575 576 /* 577 * Call Tx congestion management modes. 578 */ 579 enum rxrpc_congest_mode { 580 RXRPC_CALL_SLOW_START, 581 RXRPC_CALL_CONGEST_AVOIDANCE, 582 RXRPC_CALL_PACKET_LOSS, 583 RXRPC_CALL_FAST_RETRANSMIT, 584 NR__RXRPC_CONGEST_MODES 585 }; 586 587 /* 588 * RxRPC call definition 589 * - matched by { connection, call_id } 590 */ 591 struct rxrpc_call { 592 struct rcu_head rcu; 593 struct rxrpc_connection *conn; /* connection carrying call */ 594 struct rxrpc_peer *peer; /* Peer record for remote address */ 595 struct rxrpc_local *local; /* Representation of local endpoint */ 596 struct rxrpc_sock __rcu *socket; /* socket responsible */ 597 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ 598 struct key *key; /* Security details */ 599 const struct rxrpc_security *security; /* applied security module */ 600 struct mutex user_mutex; /* User access mutex */ 601 struct sockaddr_rxrpc dest_srx; /* Destination address */ 602 unsigned long delay_ack_at; /* When DELAY ACK needs to happen */ 603 unsigned long ack_lost_at; /* When ACK is figured as lost */ 604 unsigned long resend_at; /* When next resend needs to happen */ 605 unsigned long ping_at; /* When next to send a ping */ 606 unsigned long keepalive_at; /* When next to send a keepalive ping */ 607 unsigned long expect_rx_by; /* When we expect to get a packet by */ 608 unsigned long expect_req_by; /* When we expect to get a request DATA packet by */ 609 unsigned long expect_term_by; /* When we expect call termination by */ 610 u32 next_rx_timo; /* Timeout for next Rx packet (jif) */ 611 u32 next_req_timo; /* Timeout for next Rx request packet (jif) */ 612 struct timer_list timer; /* Combined event timer */ 613 struct work_struct destroyer; /* In-process-context destroyer */ 614 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */ 615 struct list_head link; /* link in master call list */ 616 struct list_head chan_wait_link; /* Link in conn->bundle->waiting_calls */ 617 struct hlist_node error_link; /* link in error distribution list */ 618 struct list_head accept_link; /* Link in rx->acceptq */ 619 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */ 620 struct list_head sock_link; /* Link in rx->sock_calls */ 621 struct rb_node sock_node; /* Node in rx->calls */ 622 struct list_head attend_link; /* Link in local->call_attend_q */ 623 struct rxrpc_txbuf *tx_pending; /* Tx buffer being filled */ 624 wait_queue_head_t waitq; /* Wait queue for channel or Tx */ 625 s64 tx_total_len; /* Total length left to be transmitted (or -1) */ 626 unsigned long user_call_ID; /* user-defined call ID */ 627 unsigned long flags; 628 unsigned long events; 629 spinlock_t notify_lock; /* Kernel notification lock */ 630 rwlock_t state_lock; /* lock for state transition */ 631 const char *send_abort_why; /* String indicating why the abort was sent */ 632 s32 send_abort; /* Abort code to be sent */ 633 short send_abort_err; /* Error to be associated with the abort */ 634 s32 abort_code; /* Local/remote abort code */ 635 int error; /* Local error incurred */ 636 enum rxrpc_call_state state; /* current state of call */ 637 enum rxrpc_call_completion completion; /* Call completion condition */ 638 refcount_t ref; 639 u8 security_ix; /* Security type */ 640 enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */ 641 u32 call_id; /* call ID on connection */ 642 u32 cid; /* connection ID plus channel index */ 643 u32 security_level; /* Security level selected */ 644 int debug_id; /* debug ID for printks */ 645 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */ 646 unsigned short rx_pkt_len; /* Current recvmsg packet len */ 647 648 /* Transmitted data tracking. */ 649 spinlock_t tx_lock; /* Transmit queue lock */ 650 struct list_head tx_sendmsg; /* Sendmsg prepared packets */ 651 struct list_head tx_buffer; /* Buffer of transmissible packets */ 652 rxrpc_seq_t tx_bottom; /* First packet in buffer */ 653 rxrpc_seq_t tx_transmitted; /* Highest packet transmitted */ 654 rxrpc_seq_t tx_prepared; /* Highest Tx slot prepared. */ 655 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */ 656 u16 tx_backoff; /* Delay to insert due to Tx failure */ 657 u8 tx_winsize; /* Maximum size of Tx window */ 658 #define RXRPC_TX_MAX_WINDOW 128 659 ktime_t tx_last_sent; /* Last time a transmission occurred */ 660 661 /* Received data tracking */ 662 struct sk_buff_head recvmsg_queue; /* Queue of packets ready for recvmsg() */ 663 struct sk_buff_head rx_oos_queue; /* Queue of out of sequence packets */ 664 665 rxrpc_seq_t rx_highest_seq; /* Higest sequence number received */ 666 rxrpc_seq_t rx_consumed; /* Highest packet consumed */ 667 rxrpc_serial_t rx_serial; /* Highest serial received for this call */ 668 u8 rx_winsize; /* Size of Rx window */ 669 670 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS 671 * is fixed, we keep these numbers in terms of segments (ie. DATA 672 * packets) rather than bytes. 673 */ 674 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN 675 #define RXRPC_MIN_CWND (RXRPC_TX_SMSS > 2190 ? 2 : RXRPC_TX_SMSS > 1095 ? 3 : 4) 676 u8 cong_cwnd; /* Congestion window size */ 677 u8 cong_extra; /* Extra to send for congestion management */ 678 u8 cong_ssthresh; /* Slow-start threshold */ 679 enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */ 680 u8 cong_dup_acks; /* Count of ACKs showing missing packets */ 681 u8 cong_cumul_acks; /* Cumulative ACK count */ 682 ktime_t cong_tstamp; /* Last time cwnd was changed */ 683 684 /* Receive-phase ACK management (ACKs we send). */ 685 u8 ackr_reason; /* reason to ACK */ 686 rxrpc_serial_t ackr_serial; /* serial of packet being ACK'd */ 687 atomic64_t ackr_window; /* Base (in LSW) and top (in MSW) of SACK window */ 688 atomic_t ackr_nr_unacked; /* Number of unacked packets */ 689 atomic_t ackr_nr_consumed; /* Number of packets needing hard ACK */ 690 struct { 691 #define RXRPC_SACK_SIZE 256 692 /* SACK table for soft-acked packets */ 693 u8 ackr_sack_table[RXRPC_SACK_SIZE]; 694 } __aligned(8); 695 696 /* RTT management */ 697 rxrpc_serial_t rtt_serial[4]; /* Serial number of DATA or PING sent */ 698 ktime_t rtt_sent_at[4]; /* Time packet sent */ 699 unsigned long rtt_avail; /* Mask of available slots in bits 0-3, 700 * Mask of pending samples in 8-11 */ 701 #define RXRPC_CALL_RTT_AVAIL_MASK 0xf 702 #define RXRPC_CALL_RTT_PEND_SHIFT 8 703 704 /* Transmission-phase ACK management (ACKs we've received). */ 705 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */ 706 rxrpc_seq_t acks_first_seq; /* first sequence number received */ 707 rxrpc_seq_t acks_prev_seq; /* Highest previousPacket received */ 708 rxrpc_seq_t acks_hard_ack; /* Latest hard-ack point */ 709 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */ 710 rxrpc_serial_t acks_highest_serial; /* Highest serial number ACK'd */ 711 }; 712 713 /* 714 * Summary of a new ACK and the changes it made to the Tx buffer packet states. 715 */ 716 struct rxrpc_ack_summary { 717 u16 nr_acks; /* Number of ACKs in packet */ 718 u16 nr_new_acks; /* Number of new ACKs in packet */ 719 u16 nr_rot_new_acks; /* Number of rotated new ACKs */ 720 u8 ack_reason; 721 bool saw_nacks; /* Saw NACKs in packet */ 722 bool new_low_nack; /* T if new low NACK found */ 723 bool retrans_timeo; /* T if reTx due to timeout happened */ 724 u8 flight_size; /* Number of unreceived transmissions */ 725 /* Place to stash values for tracing */ 726 enum rxrpc_congest_mode mode:8; 727 u8 cwnd; 728 u8 ssthresh; 729 u8 dup_acks; 730 u8 cumulative_acks; 731 }; 732 733 /* 734 * sendmsg() cmsg-specified parameters. 735 */ 736 enum rxrpc_command { 737 RXRPC_CMD_SEND_DATA, /* send data message */ 738 RXRPC_CMD_SEND_ABORT, /* request abort generation */ 739 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */ 740 RXRPC_CMD_CHARGE_ACCEPT, /* [server] charge accept preallocation */ 741 }; 742 743 struct rxrpc_call_params { 744 s64 tx_total_len; /* Total Tx data length (if send data) */ 745 unsigned long user_call_ID; /* User's call ID */ 746 struct { 747 u32 hard; /* Maximum lifetime (sec) */ 748 u32 idle; /* Max time since last data packet (msec) */ 749 u32 normal; /* Max time since last call packet (msec) */ 750 } timeouts; 751 u8 nr_timeouts; /* Number of timeouts specified */ 752 bool kernel; /* T if kernel is making the call */ 753 enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */ 754 }; 755 756 struct rxrpc_send_params { 757 struct rxrpc_call_params call; 758 u32 abort_code; /* Abort code to Tx (if abort) */ 759 enum rxrpc_command command : 8; /* The command to implement */ 760 bool exclusive; /* Shared or exclusive call */ 761 bool upgrade; /* If the connection is upgradeable */ 762 }; 763 764 /* 765 * Buffer of data to be output as a packet. 766 */ 767 struct rxrpc_txbuf { 768 struct rcu_head rcu; 769 struct list_head call_link; /* Link in call->tx_sendmsg/tx_buffer */ 770 struct list_head tx_link; /* Link in live Enc queue or Tx queue */ 771 ktime_t last_sent; /* Time at which last transmitted */ 772 refcount_t ref; 773 rxrpc_seq_t seq; /* Sequence number of this packet */ 774 unsigned int call_debug_id; 775 unsigned int debug_id; 776 unsigned int len; /* Amount of data in buffer */ 777 unsigned int space; /* Remaining data space */ 778 unsigned int offset; /* Offset of fill point */ 779 unsigned long flags; 780 #define RXRPC_TXBUF_LAST 0 /* Set if last packet in Tx phase */ 781 #define RXRPC_TXBUF_RESENT 1 /* Set if has been resent */ 782 u8 /*enum rxrpc_propose_ack_trace*/ ack_why; /* If ack, why */ 783 struct { 784 /* The packet for encrypting and DMA'ing. We align it such 785 * that data[] aligns correctly for any crypto blocksize. 786 */ 787 u8 pad[64 - sizeof(struct rxrpc_wire_header)]; 788 struct rxrpc_wire_header wire; /* Network-ready header */ 789 union { 790 u8 data[RXRPC_JUMBO_DATALEN]; /* Data packet */ 791 struct { 792 struct rxrpc_ackpacket ack; 793 u8 acks[0]; 794 }; 795 }; 796 } __aligned(64); 797 }; 798 799 static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb) 800 { 801 return txb->wire.flags & RXRPC_CLIENT_INITIATED; 802 } 803 804 static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb) 805 { 806 return !rxrpc_sending_to_server(txb); 807 } 808 809 #include <trace/events/rxrpc.h> 810 811 /* 812 * af_rxrpc.c 813 */ 814 extern atomic_t rxrpc_n_rx_skbs; 815 extern struct workqueue_struct *rxrpc_workqueue; 816 817 /* 818 * call_accept.c 819 */ 820 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t); 821 void rxrpc_discard_prealloc(struct rxrpc_sock *); 822 int rxrpc_new_incoming_call(struct rxrpc_local *, struct rxrpc_peer *, 823 struct rxrpc_connection *, struct sockaddr_rxrpc *, 824 struct sk_buff *); 825 void rxrpc_accept_incoming_calls(struct rxrpc_local *); 826 int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long); 827 828 /* 829 * call_event.c 830 */ 831 void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial, 832 enum rxrpc_propose_ack_trace why); 833 void rxrpc_send_ACK(struct rxrpc_call *, u8, rxrpc_serial_t, enum rxrpc_propose_ack_trace); 834 void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t, 835 enum rxrpc_propose_ack_trace); 836 void rxrpc_shrink_call_tx_buffer(struct rxrpc_call *); 837 void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb); 838 839 void rxrpc_reduce_call_timer(struct rxrpc_call *call, 840 unsigned long expire_at, 841 unsigned long now, 842 enum rxrpc_timer_trace why); 843 844 void rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb); 845 846 /* 847 * call_object.c 848 */ 849 extern const char *const rxrpc_call_states[]; 850 extern const char *const rxrpc_call_completions[]; 851 extern struct kmem_cache *rxrpc_call_jar; 852 853 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what); 854 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long); 855 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int); 856 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *, 857 struct rxrpc_conn_parameters *, 858 struct sockaddr_rxrpc *, 859 struct rxrpc_call_params *, gfp_t, 860 unsigned int); 861 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *, 862 struct sk_buff *); 863 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *); 864 void rxrpc_release_calls_on_socket(struct rxrpc_sock *); 865 void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace); 866 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 867 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 868 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace); 869 void rxrpc_cleanup_call(struct rxrpc_call *); 870 void rxrpc_destroy_all_calls(struct rxrpc_net *); 871 872 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call) 873 { 874 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags); 875 } 876 877 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call) 878 { 879 return !rxrpc_is_service_call(call); 880 } 881 882 /* 883 * conn_client.c 884 */ 885 extern unsigned int rxrpc_reap_client_connections; 886 extern unsigned long rxrpc_conn_idle_client_expiry; 887 extern unsigned long rxrpc_conn_idle_client_fast_expiry; 888 extern struct idr rxrpc_client_conn_ids; 889 890 void rxrpc_destroy_client_conn_ids(void); 891 struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 892 void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 893 int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_call *, 894 struct rxrpc_conn_parameters *, struct sockaddr_rxrpc *, 895 gfp_t); 896 void rxrpc_expose_client_call(struct rxrpc_call *); 897 void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *); 898 void rxrpc_put_client_conn(struct rxrpc_connection *, enum rxrpc_conn_trace); 899 void rxrpc_discard_expired_client_conns(struct work_struct *); 900 void rxrpc_destroy_all_client_connections(struct rxrpc_net *); 901 void rxrpc_clean_up_local_conns(struct rxrpc_local *); 902 903 /* 904 * conn_event.c 905 */ 906 void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb, 907 unsigned int channel); 908 void rxrpc_process_connection(struct work_struct *); 909 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool); 910 int rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb); 911 void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb); 912 913 /* 914 * conn_object.c 915 */ 916 extern unsigned int rxrpc_connection_expiry; 917 extern unsigned int rxrpc_closed_conn_expiry; 918 919 void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why); 920 struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t); 921 struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *, 922 struct sockaddr_rxrpc *, 923 struct sk_buff *); 924 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *); 925 void rxrpc_disconnect_call(struct rxrpc_call *); 926 void rxrpc_kill_client_conn(struct rxrpc_connection *); 927 void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace); 928 void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 929 struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *, 930 enum rxrpc_conn_trace); 931 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *, 932 enum rxrpc_conn_trace); 933 void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 934 void rxrpc_service_connection_reaper(struct work_struct *); 935 void rxrpc_destroy_all_connections(struct rxrpc_net *); 936 937 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn) 938 { 939 return conn->out_clientflag; 940 } 941 942 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn) 943 { 944 return !rxrpc_conn_is_client(conn); 945 } 946 947 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn, 948 unsigned long expire_at) 949 { 950 timer_reduce(&conn->timer, expire_at); 951 } 952 953 /* 954 * conn_service.c 955 */ 956 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *, 957 struct sk_buff *); 958 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t); 959 void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *, 960 const struct rxrpc_security *, struct sk_buff *); 961 void rxrpc_unpublish_service_conn(struct rxrpc_connection *); 962 963 /* 964 * input.c 965 */ 966 void rxrpc_congestion_degrade(struct rxrpc_call *); 967 void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *); 968 void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *); 969 970 /* 971 * io_thread.c 972 */ 973 int rxrpc_encap_rcv(struct sock *, struct sk_buff *); 974 void rxrpc_error_report(struct sock *); 975 int rxrpc_io_thread(void *data); 976 static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local) 977 { 978 wake_up_process(local->io_thread); 979 } 980 981 /* 982 * insecure.c 983 */ 984 extern const struct rxrpc_security rxrpc_no_security; 985 986 /* 987 * key.c 988 */ 989 extern struct key_type key_type_rxrpc; 990 991 int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int); 992 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t, 993 u32); 994 995 /* 996 * local_event.c 997 */ 998 void rxrpc_send_version_request(struct rxrpc_local *local, 999 struct rxrpc_host_header *hdr, 1000 struct sk_buff *skb); 1001 1002 /* 1003 * local_object.c 1004 */ 1005 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *); 1006 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace); 1007 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace); 1008 void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace); 1009 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace); 1010 void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace); 1011 void rxrpc_destroy_local(struct rxrpc_local *local); 1012 void rxrpc_destroy_all_locals(struct rxrpc_net *); 1013 1014 static inline bool __rxrpc_use_local(struct rxrpc_local *local, 1015 enum rxrpc_local_trace why) 1016 { 1017 int r, u; 1018 1019 r = refcount_read(&local->ref); 1020 u = atomic_fetch_add_unless(&local->active_users, 1, 0); 1021 trace_rxrpc_local(local->debug_id, why, r, u); 1022 return u != 0; 1023 } 1024 1025 static inline void rxrpc_see_local(struct rxrpc_local *local, 1026 enum rxrpc_local_trace why) 1027 { 1028 int r, u; 1029 1030 r = refcount_read(&local->ref); 1031 u = atomic_read(&local->active_users); 1032 trace_rxrpc_local(local->debug_id, why, r, u); 1033 } 1034 1035 /* 1036 * misc.c 1037 */ 1038 extern unsigned int rxrpc_max_backlog __read_mostly; 1039 extern unsigned long rxrpc_soft_ack_delay; 1040 extern unsigned long rxrpc_idle_ack_delay; 1041 extern unsigned int rxrpc_rx_window_size; 1042 extern unsigned int rxrpc_rx_mtu; 1043 extern unsigned int rxrpc_rx_jumbo_max; 1044 1045 /* 1046 * net_ns.c 1047 */ 1048 extern unsigned int rxrpc_net_id; 1049 extern struct pernet_operations rxrpc_net_ops; 1050 1051 static inline struct rxrpc_net *rxrpc_net(struct net *net) 1052 { 1053 return net_generic(net, rxrpc_net_id); 1054 } 1055 1056 /* 1057 * output.c 1058 */ 1059 int rxrpc_send_ack_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb); 1060 int rxrpc_send_abort_packet(struct rxrpc_call *); 1061 int rxrpc_send_data_packet(struct rxrpc_call *, struct rxrpc_txbuf *); 1062 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb); 1063 void rxrpc_send_keepalive(struct rxrpc_peer *); 1064 void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb); 1065 1066 /* 1067 * peer_event.c 1068 */ 1069 void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *); 1070 void rxrpc_peer_keepalive_worker(struct work_struct *); 1071 1072 /* 1073 * peer_object.c 1074 */ 1075 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *, 1076 const struct sockaddr_rxrpc *); 1077 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local, 1078 struct sockaddr_rxrpc *srx, gfp_t gfp); 1079 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t, 1080 enum rxrpc_peer_trace); 1081 void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer); 1082 void rxrpc_destroy_all_peers(struct rxrpc_net *); 1083 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1084 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace); 1085 void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1086 1087 /* 1088 * proc.c 1089 */ 1090 extern const struct seq_operations rxrpc_call_seq_ops; 1091 extern const struct seq_operations rxrpc_connection_seq_ops; 1092 extern const struct seq_operations rxrpc_peer_seq_ops; 1093 extern const struct seq_operations rxrpc_local_seq_ops; 1094 1095 /* 1096 * recvmsg.c 1097 */ 1098 void rxrpc_notify_socket(struct rxrpc_call *); 1099 bool __rxrpc_set_call_completion(struct rxrpc_call *, enum rxrpc_call_completion, u32, int); 1100 bool rxrpc_set_call_completion(struct rxrpc_call *, enum rxrpc_call_completion, u32, int); 1101 bool __rxrpc_call_completed(struct rxrpc_call *); 1102 bool rxrpc_call_completed(struct rxrpc_call *); 1103 bool __rxrpc_abort_call(const char *, struct rxrpc_call *, rxrpc_seq_t, u32, int); 1104 bool rxrpc_abort_call(const char *, struct rxrpc_call *, rxrpc_seq_t, u32, int); 1105 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int); 1106 1107 /* 1108 * Abort a call due to a protocol error. 1109 */ 1110 static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call, 1111 struct sk_buff *skb, 1112 const char *eproto_why, 1113 const char *why, 1114 u32 abort_code) 1115 { 1116 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 1117 1118 trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why); 1119 return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO); 1120 } 1121 1122 #define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \ 1123 __rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \ 1124 (abort_why), (abort_code)) 1125 1126 /* 1127 * rtt.c 1128 */ 1129 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, int, 1130 rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t); 1131 unsigned long rxrpc_get_rto_backoff(struct rxrpc_peer *, bool); 1132 void rxrpc_peer_init_rtt(struct rxrpc_peer *); 1133 1134 /* 1135 * rxkad.c 1136 */ 1137 #ifdef CONFIG_RXKAD 1138 extern const struct rxrpc_security rxkad; 1139 #endif 1140 1141 /* 1142 * security.c 1143 */ 1144 int __init rxrpc_init_security(void); 1145 const struct rxrpc_security *rxrpc_security_lookup(u8); 1146 void rxrpc_exit_security(void); 1147 int rxrpc_init_client_call_security(struct rxrpc_call *); 1148 int rxrpc_init_client_conn_security(struct rxrpc_connection *); 1149 const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *, 1150 struct sk_buff *); 1151 struct key *rxrpc_look_up_server_security(struct rxrpc_connection *, 1152 struct sk_buff *, u32, u32); 1153 1154 /* 1155 * sendmsg.c 1156 */ 1157 bool rxrpc_propose_abort(struct rxrpc_call *call, 1158 u32 abort_code, int error, const char *why); 1159 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t); 1160 1161 /* 1162 * server_key.c 1163 */ 1164 extern struct key_type key_type_rxrpc_s; 1165 1166 int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int); 1167 1168 /* 1169 * skbuff.c 1170 */ 1171 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *); 1172 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace); 1173 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace); 1174 void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace); 1175 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace); 1176 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace); 1177 void rxrpc_purge_queue(struct sk_buff_head *); 1178 1179 /* 1180 * stats.c 1181 */ 1182 int rxrpc_stats_show(struct seq_file *seq, void *v); 1183 int rxrpc_stats_clear(struct file *file, char *buf, size_t size); 1184 1185 #define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s) 1186 #define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s) 1187 1188 /* 1189 * sysctl.c 1190 */ 1191 #ifdef CONFIG_SYSCTL 1192 extern int __init rxrpc_sysctl_init(void); 1193 extern void rxrpc_sysctl_exit(void); 1194 #else 1195 static inline int __init rxrpc_sysctl_init(void) { return 0; } 1196 static inline void rxrpc_sysctl_exit(void) {} 1197 #endif 1198 1199 /* 1200 * txbuf.c 1201 */ 1202 extern atomic_t rxrpc_nr_txbuf; 1203 struct rxrpc_txbuf *rxrpc_alloc_txbuf(struct rxrpc_call *call, u8 packet_type, 1204 gfp_t gfp); 1205 void rxrpc_get_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1206 void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1207 void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1208 1209 /* 1210 * utils.c 1211 */ 1212 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *); 1213 1214 static inline bool before(u32 seq1, u32 seq2) 1215 { 1216 return (s32)(seq1 - seq2) < 0; 1217 } 1218 static inline bool before_eq(u32 seq1, u32 seq2) 1219 { 1220 return (s32)(seq1 - seq2) <= 0; 1221 } 1222 static inline bool after(u32 seq1, u32 seq2) 1223 { 1224 return (s32)(seq1 - seq2) > 0; 1225 } 1226 static inline bool after_eq(u32 seq1, u32 seq2) 1227 { 1228 return (s32)(seq1 - seq2) >= 0; 1229 } 1230 1231 /* 1232 * debug tracing 1233 */ 1234 extern unsigned int rxrpc_debug; 1235 1236 #define dbgprintk(FMT,...) \ 1237 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1238 1239 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1240 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1241 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1242 1243 1244 #if defined(__KDEBUG) 1245 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1246 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1247 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1248 1249 #elif defined(CONFIG_AF_RXRPC_DEBUG) 1250 #define RXRPC_DEBUG_KENTER 0x01 1251 #define RXRPC_DEBUG_KLEAVE 0x02 1252 #define RXRPC_DEBUG_KDEBUG 0x04 1253 1254 #define _enter(FMT,...) \ 1255 do { \ 1256 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \ 1257 kenter(FMT,##__VA_ARGS__); \ 1258 } while (0) 1259 1260 #define _leave(FMT,...) \ 1261 do { \ 1262 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \ 1263 kleave(FMT,##__VA_ARGS__); \ 1264 } while (0) 1265 1266 #define _debug(FMT,...) \ 1267 do { \ 1268 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \ 1269 kdebug(FMT,##__VA_ARGS__); \ 1270 } while (0) 1271 1272 #else 1273 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1274 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1275 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1276 #endif 1277 1278 /* 1279 * debug assertion checking 1280 */ 1281 #if 1 // defined(__KDEBUGALL) 1282 1283 #define ASSERT(X) \ 1284 do { \ 1285 if (unlikely(!(X))) { \ 1286 pr_err("Assertion failed\n"); \ 1287 BUG(); \ 1288 } \ 1289 } while (0) 1290 1291 #define ASSERTCMP(X, OP, Y) \ 1292 do { \ 1293 __typeof__(X) _x = (X); \ 1294 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1295 if (unlikely(!(_x OP _y))) { \ 1296 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1297 (unsigned long)_x, (unsigned long)_x, #OP, \ 1298 (unsigned long)_y, (unsigned long)_y); \ 1299 BUG(); \ 1300 } \ 1301 } while (0) 1302 1303 #define ASSERTIF(C, X) \ 1304 do { \ 1305 if (unlikely((C) && !(X))) { \ 1306 pr_err("Assertion failed\n"); \ 1307 BUG(); \ 1308 } \ 1309 } while (0) 1310 1311 #define ASSERTIFCMP(C, X, OP, Y) \ 1312 do { \ 1313 __typeof__(X) _x = (X); \ 1314 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1315 if (unlikely((C) && !(_x OP _y))) { \ 1316 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1317 (unsigned long)_x, (unsigned long)_x, #OP, \ 1318 (unsigned long)_y, (unsigned long)_y); \ 1319 BUG(); \ 1320 } \ 1321 } while (0) 1322 1323 #else 1324 1325 #define ASSERT(X) \ 1326 do { \ 1327 } while (0) 1328 1329 #define ASSERTCMP(X, OP, Y) \ 1330 do { \ 1331 } while (0) 1332 1333 #define ASSERTIF(C, X) \ 1334 do { \ 1335 } while (0) 1336 1337 #define ASSERTIFCMP(C, X, OP, Y) \ 1338 do { \ 1339 } while (0) 1340 1341 #endif /* __KDEBUGALL */ 1342