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_SERVICE_CONN_SECURED, /* Service connection response has been verified */ 42 RXRPC_SKB_MARK_REJECT_BUSY, /* Reject with BUSY */ 43 RXRPC_SKB_MARK_REJECT_ABORT, /* Reject with ABORT (code in skb->priority) */ 44 }; 45 46 /* 47 * sk_state for RxRPC sockets 48 */ 49 enum { 50 RXRPC_UNBOUND = 0, 51 RXRPC_CLIENT_UNBOUND, /* Unbound socket used as client */ 52 RXRPC_CLIENT_BOUND, /* client local address bound */ 53 RXRPC_SERVER_BOUND, /* server local address bound */ 54 RXRPC_SERVER_BOUND2, /* second server local address bound */ 55 RXRPC_SERVER_LISTENING, /* server listening for connections */ 56 RXRPC_SERVER_LISTEN_DISABLED, /* server listening disabled */ 57 RXRPC_CLOSE, /* socket is being closed */ 58 }; 59 60 /* 61 * Per-network namespace data. 62 */ 63 struct rxrpc_net { 64 struct proc_dir_entry *proc_net; /* Subdir in /proc/net */ 65 u32 epoch; /* Local epoch for detecting local-end reset */ 66 struct list_head calls; /* List of calls active in this namespace */ 67 spinlock_t call_lock; /* Lock for ->calls */ 68 atomic_t nr_calls; /* Count of allocated calls */ 69 70 atomic_t nr_conns; 71 struct list_head conn_proc_list; /* List of conns in this namespace for proc */ 72 struct list_head service_conns; /* Service conns in this namespace */ 73 rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */ 74 struct work_struct service_conn_reaper; 75 struct timer_list service_conn_reap_timer; 76 77 bool live; 78 79 atomic_t nr_client_conns; 80 81 struct hlist_head local_endpoints; 82 struct mutex local_mutex; /* Lock for ->local_endpoints */ 83 84 DECLARE_HASHTABLE (peer_hash, 10); 85 spinlock_t peer_hash_lock; /* Lock for ->peer_hash */ 86 87 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */ 88 u8 peer_keepalive_cursor; 89 time64_t peer_keepalive_base; 90 struct list_head peer_keepalive[32]; 91 struct list_head peer_keepalive_new; 92 struct timer_list peer_keepalive_timer; 93 struct work_struct peer_keepalive_work; 94 95 atomic_t stat_tx_data; 96 atomic_t stat_tx_data_retrans; 97 atomic_t stat_tx_data_send; 98 atomic_t stat_tx_data_send_frag; 99 atomic_t stat_tx_data_send_fail; 100 atomic_t stat_tx_data_underflow; 101 atomic_t stat_tx_data_cwnd_reset; 102 atomic_t stat_rx_data; 103 atomic_t stat_rx_data_reqack; 104 atomic_t stat_rx_data_jumbo; 105 106 atomic_t stat_tx_ack_fill; 107 atomic_t stat_tx_ack_send; 108 atomic_t stat_tx_ack_skip; 109 atomic_t stat_tx_acks[256]; 110 atomic_t stat_rx_acks[256]; 111 112 atomic_t stat_why_req_ack[8]; 113 114 atomic_t stat_io_loop; 115 }; 116 117 /* 118 * Service backlog preallocation. 119 * 120 * This contains circular buffers of preallocated peers, connections and calls 121 * for incoming service calls and their head and tail pointers. This allows 122 * calls to be set up in the data_ready handler, thereby avoiding the need to 123 * shuffle packets around so much. 124 */ 125 struct rxrpc_backlog { 126 unsigned short peer_backlog_head; 127 unsigned short peer_backlog_tail; 128 unsigned short conn_backlog_head; 129 unsigned short conn_backlog_tail; 130 unsigned short call_backlog_head; 131 unsigned short call_backlog_tail; 132 #define RXRPC_BACKLOG_MAX 32 133 struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX]; 134 struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX]; 135 struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX]; 136 }; 137 138 /* 139 * RxRPC socket definition 140 */ 141 struct rxrpc_sock { 142 /* WARNING: sk has to be the first member */ 143 struct sock sk; 144 rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */ 145 rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */ 146 struct rxrpc_local *local; /* local endpoint */ 147 struct rxrpc_backlog *backlog; /* Preallocation for services */ 148 spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */ 149 struct list_head sock_calls; /* List of calls owned by this socket */ 150 struct list_head to_be_accepted; /* calls awaiting acceptance */ 151 struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */ 152 spinlock_t recvmsg_lock; /* Lock for recvmsg_q */ 153 struct key *key; /* security for this socket */ 154 struct key *securities; /* list of server security descriptors */ 155 struct rb_root calls; /* User ID -> call mapping */ 156 unsigned long flags; 157 #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */ 158 rwlock_t call_lock; /* lock for calls */ 159 u32 min_sec_level; /* minimum security level */ 160 #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT 161 bool exclusive; /* Exclusive connection for a client socket */ 162 u16 second_service; /* Additional service bound to the endpoint */ 163 struct { 164 /* Service upgrade information */ 165 u16 from; /* Service ID to upgrade (if not 0) */ 166 u16 to; /* service ID to upgrade to */ 167 } service_upgrade; 168 sa_family_t family; /* Protocol family created with */ 169 struct sockaddr_rxrpc srx; /* Primary Service/local addresses */ 170 struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */ 171 }; 172 173 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk) 174 175 /* 176 * CPU-byteorder normalised Rx packet header. 177 */ 178 struct rxrpc_host_header { 179 u32 epoch; /* client boot timestamp */ 180 u32 cid; /* connection and channel ID */ 181 u32 callNumber; /* call ID (0 for connection-level packets) */ 182 u32 seq; /* sequence number of pkt in call stream */ 183 u32 serial; /* serial number of pkt sent to network */ 184 u8 type; /* packet type */ 185 u8 flags; /* packet flags */ 186 u8 userStatus; /* app-layer defined status */ 187 u8 securityIndex; /* security protocol ID */ 188 union { 189 u16 _rsvd; /* reserved */ 190 u16 cksum; /* kerberos security checksum */ 191 }; 192 u16 serviceId; /* service ID */ 193 } __packed; 194 195 /* 196 * RxRPC socket buffer private variables 197 * - max 48 bytes (struct sk_buff::cb) 198 */ 199 struct rxrpc_skb_priv { 200 struct rxrpc_connection *conn; /* Connection referred to (poke packet) */ 201 u16 offset; /* Offset of data */ 202 u16 len; /* Length of data */ 203 u8 flags; 204 #define RXRPC_RX_VERIFIED 0x01 205 206 struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */ 207 }; 208 209 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb) 210 211 /* 212 * RxRPC security module interface 213 */ 214 struct rxrpc_security { 215 const char *name; /* name of this service */ 216 u8 security_index; /* security type provided */ 217 u32 no_key_abort; /* Abort code indicating no key */ 218 219 /* Initialise a security service */ 220 int (*init)(void); 221 222 /* Clean up a security service */ 223 void (*exit)(void); 224 225 /* Parse the information from a server key */ 226 int (*preparse_server_key)(struct key_preparsed_payload *); 227 228 /* Clean up the preparse buffer after parsing a server key */ 229 void (*free_preparse_server_key)(struct key_preparsed_payload *); 230 231 /* Destroy the payload of a server key */ 232 void (*destroy_server_key)(struct key *); 233 234 /* Describe a server key */ 235 void (*describe_server_key)(const struct key *, struct seq_file *); 236 237 /* initialise a connection's security */ 238 int (*init_connection_security)(struct rxrpc_connection *, 239 struct rxrpc_key_token *); 240 241 /* Work out how much data we can store in a packet, given an estimate 242 * of the amount of data remaining. 243 */ 244 int (*how_much_data)(struct rxrpc_call *, size_t, 245 size_t *, size_t *, size_t *); 246 247 /* impose security on a packet */ 248 int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *); 249 250 /* verify the security on a received packet */ 251 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *); 252 253 /* Free crypto request on a call */ 254 void (*free_call_crypto)(struct rxrpc_call *); 255 256 /* issue a challenge */ 257 int (*issue_challenge)(struct rxrpc_connection *); 258 259 /* respond to a challenge */ 260 int (*respond_to_challenge)(struct rxrpc_connection *, 261 struct sk_buff *); 262 263 /* verify a response */ 264 int (*verify_response)(struct rxrpc_connection *, 265 struct sk_buff *); 266 267 /* clear connection security */ 268 void (*clear)(struct rxrpc_connection *); 269 }; 270 271 /* 272 * RxRPC local transport endpoint description 273 * - owned by a single AF_RXRPC socket 274 * - pointed to by transport socket struct sk_user_data 275 */ 276 struct rxrpc_local { 277 struct rcu_head rcu; 278 atomic_t active_users; /* Number of users of the local endpoint */ 279 refcount_t ref; /* Number of references to the structure */ 280 struct net *net; /* The network namespace */ 281 struct rxrpc_net *rxnet; /* Our bits in the network namespace */ 282 struct hlist_node link; 283 struct socket *socket; /* my UDP socket */ 284 struct task_struct *io_thread; 285 struct completion io_thread_ready; /* Indication that the I/O thread started */ 286 struct rxrpc_sock *service; /* Service(s) listening on this endpoint */ 287 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY 288 struct sk_buff_head rx_delay_queue; /* Delay injection queue */ 289 #endif 290 struct sk_buff_head rx_queue; /* Received packets */ 291 struct list_head conn_attend_q; /* Conns requiring immediate attention */ 292 struct list_head call_attend_q; /* Calls requiring immediate attention */ 293 294 struct rb_root client_bundles; /* Client connection bundles by socket params */ 295 spinlock_t client_bundles_lock; /* Lock for client_bundles */ 296 bool kill_all_client_conns; 297 struct list_head idle_client_conns; 298 struct timer_list client_conn_reap_timer; 299 unsigned long client_conn_flags; 300 #define RXRPC_CLIENT_CONN_REAP_TIMER 0 /* The client conn reap timer expired */ 301 302 spinlock_t lock; /* access lock */ 303 rwlock_t services_lock; /* lock for services list */ 304 int debug_id; /* debug ID for printks */ 305 bool dead; 306 bool service_closed; /* Service socket closed */ 307 struct idr conn_ids; /* List of connection IDs */ 308 struct list_head new_client_calls; /* Newly created client calls need connection */ 309 spinlock_t client_call_lock; /* Lock for ->new_client_calls */ 310 struct sockaddr_rxrpc srx; /* local address */ 311 }; 312 313 /* 314 * RxRPC remote transport endpoint definition 315 * - matched by local endpoint, remote port, address and protocol type 316 */ 317 struct rxrpc_peer { 318 struct rcu_head rcu; /* This must be first */ 319 refcount_t ref; 320 unsigned long hash_key; 321 struct hlist_node hash_link; 322 struct rxrpc_local *local; 323 struct hlist_head error_targets; /* targets for net error distribution */ 324 struct rb_root service_conns; /* Service connections */ 325 struct list_head keepalive_link; /* Link in net->peer_keepalive[] */ 326 time64_t last_tx_at; /* Last time packet sent here */ 327 seqlock_t service_conn_lock; 328 spinlock_t lock; /* access lock */ 329 unsigned int if_mtu; /* interface MTU for this peer */ 330 unsigned int mtu; /* network MTU for this peer */ 331 unsigned int maxdata; /* data size (MTU - hdrsize) */ 332 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */ 333 int debug_id; /* debug ID for printks */ 334 struct sockaddr_rxrpc srx; /* remote address */ 335 336 /* calculated RTT cache */ 337 #define RXRPC_RTT_CACHE_SIZE 32 338 spinlock_t rtt_input_lock; /* RTT lock for input routine */ 339 ktime_t rtt_last_req; /* Time of last RTT request */ 340 unsigned int rtt_count; /* Number of samples we've got */ 341 342 u32 srtt_us; /* smoothed round trip time << 3 in usecs */ 343 u32 mdev_us; /* medium deviation */ 344 u32 mdev_max_us; /* maximal mdev for the last rtt period */ 345 u32 rttvar_us; /* smoothed mdev_max */ 346 u32 rto_j; /* Retransmission timeout in jiffies */ 347 u8 backoff; /* Backoff timeout */ 348 349 u8 cong_ssthresh; /* Congestion slow-start threshold */ 350 }; 351 352 /* 353 * Keys for matching a connection. 354 */ 355 struct rxrpc_conn_proto { 356 union { 357 struct { 358 u32 epoch; /* epoch of this connection */ 359 u32 cid; /* connection ID */ 360 }; 361 u64 index_key; 362 }; 363 }; 364 365 struct rxrpc_conn_parameters { 366 struct rxrpc_local *local; /* Representation of local endpoint */ 367 struct key *key; /* Security details */ 368 bool exclusive; /* T if conn is exclusive */ 369 bool upgrade; /* T if service ID can be upgraded */ 370 u16 service_id; /* Service ID for this connection */ 371 u32 security_level; /* Security level selected */ 372 }; 373 374 /* 375 * Call completion condition (state == RXRPC_CALL_COMPLETE). 376 */ 377 enum rxrpc_call_completion { 378 RXRPC_CALL_SUCCEEDED, /* - Normal termination */ 379 RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */ 380 RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */ 381 RXRPC_CALL_LOCAL_ERROR, /* - call failed due to local error */ 382 RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */ 383 NR__RXRPC_CALL_COMPLETIONS 384 }; 385 386 /* 387 * Bits in the connection flags. 388 */ 389 enum rxrpc_conn_flag { 390 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */ 391 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */ 392 RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */ 393 RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */ 394 RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */ 395 RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */ 396 RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */ 397 }; 398 399 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \ 400 (1UL << RXRPC_CONN_FINAL_ACK_1) | \ 401 (1UL << RXRPC_CONN_FINAL_ACK_2) | \ 402 (1UL << RXRPC_CONN_FINAL_ACK_3)) 403 404 /* 405 * Events that can be raised upon a connection. 406 */ 407 enum rxrpc_conn_event { 408 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */ 409 RXRPC_CONN_EV_ABORT_CALLS, /* Abort attached calls */ 410 }; 411 412 /* 413 * The connection protocol state. 414 */ 415 enum rxrpc_conn_proto_state { 416 RXRPC_CONN_UNUSED, /* Connection not yet attempted */ 417 RXRPC_CONN_CLIENT_UNSECURED, /* Client connection needs security init */ 418 RXRPC_CONN_CLIENT, /* Client connection */ 419 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */ 420 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */ 421 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */ 422 RXRPC_CONN_SERVICE, /* Service secured connection */ 423 RXRPC_CONN_ABORTED, /* Conn aborted */ 424 RXRPC_CONN__NR_STATES 425 }; 426 427 /* 428 * RxRPC client connection bundle. 429 */ 430 struct rxrpc_bundle { 431 struct rxrpc_local *local; /* Representation of local endpoint */ 432 struct rxrpc_peer *peer; /* Remote endpoint */ 433 struct key *key; /* Security details */ 434 const struct rxrpc_security *security; /* applied security module */ 435 refcount_t ref; 436 atomic_t active; /* Number of active users */ 437 unsigned int debug_id; 438 u32 security_level; /* Security level selected */ 439 u16 service_id; /* Service ID for this connection */ 440 bool try_upgrade; /* True if the bundle is attempting upgrade */ 441 bool exclusive; /* T if conn is exclusive */ 442 bool upgrade; /* T if service ID can be upgraded */ 443 unsigned short alloc_error; /* Error from last conn allocation */ 444 struct rb_node local_node; /* Node in local->client_conns */ 445 struct list_head waiting_calls; /* Calls waiting for channels */ 446 unsigned long avail_chans; /* Mask of available channels */ 447 struct rxrpc_connection *conns[4]; /* The connections in the bundle (max 4) */ 448 }; 449 450 /* 451 * RxRPC connection definition 452 * - matched by { local, peer, epoch, conn_id, direction } 453 * - each connection can only handle four simultaneous calls 454 */ 455 struct rxrpc_connection { 456 struct rxrpc_conn_proto proto; 457 struct rxrpc_local *local; /* Representation of local endpoint */ 458 struct rxrpc_peer *peer; /* Remote endpoint */ 459 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ 460 struct key *key; /* Security details */ 461 struct list_head attend_link; /* Link in local->conn_attend_q */ 462 463 refcount_t ref; 464 atomic_t active; /* Active count for service conns */ 465 struct rcu_head rcu; 466 struct list_head cache_link; 467 468 unsigned char act_chans; /* Mask of active channels */ 469 struct rxrpc_channel { 470 unsigned long final_ack_at; /* Time at which to issue final ACK */ 471 struct rxrpc_call *call; /* Active call */ 472 unsigned int call_debug_id; /* call->debug_id */ 473 u32 call_id; /* ID of current call */ 474 u32 call_counter; /* Call ID counter */ 475 u32 last_call; /* ID of last call */ 476 u8 last_type; /* Type of last packet */ 477 union { 478 u32 last_seq; 479 u32 last_abort; 480 }; 481 } channels[RXRPC_MAXCALLS]; 482 483 struct timer_list timer; /* Conn event timer */ 484 struct work_struct processor; /* connection event processor */ 485 struct work_struct destructor; /* In-process-context destroyer */ 486 struct rxrpc_bundle *bundle; /* Client connection bundle */ 487 struct rb_node service_node; /* Node in peer->service_conns */ 488 struct list_head proc_link; /* link in procfs list */ 489 struct list_head link; /* link in master connection list */ 490 struct sk_buff_head rx_queue; /* received conn-level packets */ 491 492 struct mutex security_lock; /* Lock for security management */ 493 const struct rxrpc_security *security; /* applied security module */ 494 union { 495 struct { 496 struct crypto_sync_skcipher *cipher; /* encryption handle */ 497 struct rxrpc_crypt csum_iv; /* packet checksum base */ 498 u32 nonce; /* response re-use preventer */ 499 } rxkad; 500 }; 501 unsigned long flags; 502 unsigned long events; 503 unsigned long idle_timestamp; /* Time at which last became idle */ 504 spinlock_t state_lock; /* state-change lock */ 505 enum rxrpc_conn_proto_state state; /* current state of connection */ 506 enum rxrpc_call_completion completion; /* Completion condition */ 507 s32 abort_code; /* Abort code of connection abort */ 508 int debug_id; /* debug ID for printks */ 509 atomic_t serial; /* packet serial number counter */ 510 unsigned int hi_serial; /* highest serial number received */ 511 u32 service_id; /* Service ID, possibly upgraded */ 512 u32 security_level; /* Security level selected */ 513 u8 security_ix; /* security type */ 514 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */ 515 u8 bundle_shift; /* Index into bundle->avail_chans */ 516 bool exclusive; /* T if conn is exclusive */ 517 bool upgrade; /* T if service ID can be upgraded */ 518 u16 orig_service_id; /* Originally requested service ID */ 519 short error; /* Local error code */ 520 }; 521 522 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp) 523 { 524 return sp->hdr.flags & RXRPC_CLIENT_INITIATED; 525 } 526 527 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp) 528 { 529 return !rxrpc_to_server(sp); 530 } 531 532 /* 533 * Flags in call->flags. 534 */ 535 enum rxrpc_call_flag { 536 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */ 537 RXRPC_CALL_HAS_USERID, /* has a user ID attached */ 538 RXRPC_CALL_IS_SERVICE, /* Call is service call */ 539 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */ 540 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */ 541 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */ 542 RXRPC_CALL_TX_ALL_ACKED, /* Last packet has been hard-acked */ 543 RXRPC_CALL_SEND_PING, /* A ping will need to be sent */ 544 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */ 545 RXRPC_CALL_BEGAN_RX_TIMER, /* We began the expect_rx_by timer */ 546 RXRPC_CALL_RX_HEARD, /* The peer responded at least once to this call */ 547 RXRPC_CALL_DISCONNECTED, /* The call has been disconnected */ 548 RXRPC_CALL_KERNEL, /* The call was made by the kernel */ 549 RXRPC_CALL_UPGRADE, /* Service upgrade was requested for the call */ 550 RXRPC_CALL_EXCLUSIVE, /* The call uses a once-only connection */ 551 RXRPC_CALL_RX_IS_IDLE, /* recvmsg() is idle - send an ACK */ 552 RXRPC_CALL_RECVMSG_READ_ALL, /* recvmsg() read all of the received data */ 553 }; 554 555 /* 556 * Events that can be raised on a call. 557 */ 558 enum rxrpc_call_event { 559 RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */ 560 RXRPC_CALL_EV_INITIAL_PING, /* Send initial ping for a new service call */ 561 }; 562 563 /* 564 * The states that a call can be in. 565 */ 566 enum rxrpc_call_state { 567 RXRPC_CALL_UNINITIALISED, 568 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */ 569 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */ 570 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */ 571 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */ 572 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */ 573 RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */ 574 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */ 575 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */ 576 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */ 577 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */ 578 RXRPC_CALL_COMPLETE, /* - call complete */ 579 NR__RXRPC_CALL_STATES 580 }; 581 582 /* 583 * Call Tx congestion management modes. 584 */ 585 enum rxrpc_congest_mode { 586 RXRPC_CALL_SLOW_START, 587 RXRPC_CALL_CONGEST_AVOIDANCE, 588 RXRPC_CALL_PACKET_LOSS, 589 RXRPC_CALL_FAST_RETRANSMIT, 590 NR__RXRPC_CONGEST_MODES 591 }; 592 593 /* 594 * RxRPC call definition 595 * - matched by { connection, call_id } 596 */ 597 struct rxrpc_call { 598 struct rcu_head rcu; 599 struct rxrpc_connection *conn; /* connection carrying call */ 600 struct rxrpc_bundle *bundle; /* Connection bundle to use */ 601 struct rxrpc_peer *peer; /* Peer record for remote address */ 602 struct rxrpc_local *local; /* Representation of local endpoint */ 603 struct rxrpc_sock __rcu *socket; /* socket responsible */ 604 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ 605 struct key *key; /* Security details */ 606 const struct rxrpc_security *security; /* applied security module */ 607 struct mutex user_mutex; /* User access mutex */ 608 struct sockaddr_rxrpc dest_srx; /* Destination address */ 609 unsigned long delay_ack_at; /* When DELAY ACK needs to happen */ 610 unsigned long ack_lost_at; /* When ACK is figured as lost */ 611 unsigned long resend_at; /* When next resend needs to happen */ 612 unsigned long ping_at; /* When next to send a ping */ 613 unsigned long keepalive_at; /* When next to send a keepalive ping */ 614 unsigned long expect_rx_by; /* When we expect to get a packet by */ 615 unsigned long expect_req_by; /* When we expect to get a request DATA packet by */ 616 unsigned long expect_term_by; /* When we expect call termination by */ 617 u32 next_rx_timo; /* Timeout for next Rx packet (jif) */ 618 u32 next_req_timo; /* Timeout for next Rx request packet (jif) */ 619 struct timer_list timer; /* Combined event timer */ 620 struct work_struct destroyer; /* In-process-context destroyer */ 621 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */ 622 struct list_head link; /* link in master call list */ 623 struct list_head wait_link; /* Link in local->new_client_calls */ 624 struct hlist_node error_link; /* link in error distribution list */ 625 struct list_head accept_link; /* Link in rx->acceptq */ 626 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */ 627 struct list_head sock_link; /* Link in rx->sock_calls */ 628 struct rb_node sock_node; /* Node in rx->calls */ 629 struct list_head attend_link; /* Link in local->call_attend_q */ 630 struct rxrpc_txbuf *tx_pending; /* Tx buffer being filled */ 631 wait_queue_head_t waitq; /* Wait queue for channel or Tx */ 632 s64 tx_total_len; /* Total length left to be transmitted (or -1) */ 633 unsigned long user_call_ID; /* user-defined call ID */ 634 unsigned long flags; 635 unsigned long events; 636 spinlock_t notify_lock; /* Kernel notification lock */ 637 unsigned int send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */ 638 s32 send_abort; /* Abort code to be sent */ 639 short send_abort_err; /* Error to be associated with the abort */ 640 rxrpc_seq_t send_abort_seq; /* DATA packet that incurred the abort (or 0) */ 641 s32 abort_code; /* Local/remote abort code */ 642 int error; /* Local error incurred */ 643 enum rxrpc_call_state _state; /* Current state of call (needs barrier) */ 644 enum rxrpc_call_completion completion; /* Call completion condition */ 645 refcount_t ref; 646 u8 security_ix; /* Security type */ 647 enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */ 648 u32 call_id; /* call ID on connection */ 649 u32 cid; /* connection ID plus channel index */ 650 u32 security_level; /* Security level selected */ 651 int debug_id; /* debug ID for printks */ 652 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */ 653 unsigned short rx_pkt_len; /* Current recvmsg packet len */ 654 655 /* Transmitted data tracking. */ 656 spinlock_t tx_lock; /* Transmit queue lock */ 657 struct list_head tx_sendmsg; /* Sendmsg prepared packets */ 658 struct list_head tx_buffer; /* Buffer of transmissible packets */ 659 rxrpc_seq_t tx_bottom; /* First packet in buffer */ 660 rxrpc_seq_t tx_transmitted; /* Highest packet transmitted */ 661 rxrpc_seq_t tx_prepared; /* Highest Tx slot prepared. */ 662 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */ 663 u16 tx_backoff; /* Delay to insert due to Tx failure */ 664 u8 tx_winsize; /* Maximum size of Tx window */ 665 #define RXRPC_TX_MAX_WINDOW 128 666 ktime_t tx_last_sent; /* Last time a transmission occurred */ 667 668 /* Received data tracking */ 669 struct sk_buff_head recvmsg_queue; /* Queue of packets ready for recvmsg() */ 670 struct sk_buff_head rx_oos_queue; /* Queue of out of sequence packets */ 671 672 rxrpc_seq_t rx_highest_seq; /* Higest sequence number received */ 673 rxrpc_seq_t rx_consumed; /* Highest packet consumed */ 674 rxrpc_serial_t rx_serial; /* Highest serial received for this call */ 675 u8 rx_winsize; /* Size of Rx window */ 676 677 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS 678 * is fixed, we keep these numbers in terms of segments (ie. DATA 679 * packets) rather than bytes. 680 */ 681 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN 682 #define RXRPC_MIN_CWND (RXRPC_TX_SMSS > 2190 ? 2 : RXRPC_TX_SMSS > 1095 ? 3 : 4) 683 u8 cong_cwnd; /* Congestion window size */ 684 u8 cong_extra; /* Extra to send for congestion management */ 685 u8 cong_ssthresh; /* Slow-start threshold */ 686 enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */ 687 u8 cong_dup_acks; /* Count of ACKs showing missing packets */ 688 u8 cong_cumul_acks; /* Cumulative ACK count */ 689 ktime_t cong_tstamp; /* Last time cwnd was changed */ 690 691 /* Receive-phase ACK management (ACKs we send). */ 692 u8 ackr_reason; /* reason to ACK */ 693 u16 ackr_sack_base; /* Starting slot in SACK table ring */ 694 rxrpc_serial_t ackr_serial; /* serial of packet being ACK'd */ 695 rxrpc_seq_t ackr_window; /* Base of SACK window */ 696 rxrpc_seq_t ackr_wtop; /* Base of SACK window */ 697 unsigned int ackr_nr_unacked; /* Number of unacked packets */ 698 atomic_t ackr_nr_consumed; /* Number of packets needing hard ACK */ 699 struct { 700 #define RXRPC_SACK_SIZE 256 701 /* SACK table for soft-acked packets */ 702 u8 ackr_sack_table[RXRPC_SACK_SIZE]; 703 } __aligned(8); 704 705 /* RTT management */ 706 rxrpc_serial_t rtt_serial[4]; /* Serial number of DATA or PING sent */ 707 ktime_t rtt_sent_at[4]; /* Time packet sent */ 708 unsigned long rtt_avail; /* Mask of available slots in bits 0-3, 709 * Mask of pending samples in 8-11 */ 710 #define RXRPC_CALL_RTT_AVAIL_MASK 0xf 711 #define RXRPC_CALL_RTT_PEND_SHIFT 8 712 713 /* Transmission-phase ACK management (ACKs we've received). */ 714 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */ 715 rxrpc_seq_t acks_first_seq; /* first sequence number received */ 716 rxrpc_seq_t acks_prev_seq; /* Highest previousPacket received */ 717 rxrpc_seq_t acks_hard_ack; /* Latest hard-ack point */ 718 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */ 719 rxrpc_serial_t acks_highest_serial; /* Highest serial number ACK'd */ 720 }; 721 722 /* 723 * Summary of a new ACK and the changes it made to the Tx buffer packet states. 724 */ 725 struct rxrpc_ack_summary { 726 u16 nr_acks; /* Number of ACKs in packet */ 727 u16 nr_new_acks; /* Number of new ACKs in packet */ 728 u16 nr_rot_new_acks; /* Number of rotated new ACKs */ 729 u8 ack_reason; 730 bool saw_nacks; /* Saw NACKs in packet */ 731 bool new_low_nack; /* T if new low NACK found */ 732 bool retrans_timeo; /* T if reTx due to timeout happened */ 733 u8 flight_size; /* Number of unreceived transmissions */ 734 /* Place to stash values for tracing */ 735 enum rxrpc_congest_mode mode:8; 736 u8 cwnd; 737 u8 ssthresh; 738 u8 dup_acks; 739 u8 cumulative_acks; 740 }; 741 742 /* 743 * sendmsg() cmsg-specified parameters. 744 */ 745 enum rxrpc_command { 746 RXRPC_CMD_SEND_DATA, /* send data message */ 747 RXRPC_CMD_SEND_ABORT, /* request abort generation */ 748 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */ 749 RXRPC_CMD_CHARGE_ACCEPT, /* [server] charge accept preallocation */ 750 }; 751 752 struct rxrpc_call_params { 753 s64 tx_total_len; /* Total Tx data length (if send data) */ 754 unsigned long user_call_ID; /* User's call ID */ 755 struct { 756 u32 hard; /* Maximum lifetime (sec) */ 757 u32 idle; /* Max time since last data packet (msec) */ 758 u32 normal; /* Max time since last call packet (msec) */ 759 } timeouts; 760 u8 nr_timeouts; /* Number of timeouts specified */ 761 bool kernel; /* T if kernel is making the call */ 762 enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */ 763 }; 764 765 struct rxrpc_send_params { 766 struct rxrpc_call_params call; 767 u32 abort_code; /* Abort code to Tx (if abort) */ 768 enum rxrpc_command command : 8; /* The command to implement */ 769 bool exclusive; /* Shared or exclusive call */ 770 bool upgrade; /* If the connection is upgradeable */ 771 }; 772 773 /* 774 * Buffer of data to be output as a packet. 775 */ 776 struct rxrpc_txbuf { 777 struct rcu_head rcu; 778 struct list_head call_link; /* Link in call->tx_sendmsg/tx_buffer */ 779 struct list_head tx_link; /* Link in live Enc queue or Tx queue */ 780 ktime_t last_sent; /* Time at which last transmitted */ 781 refcount_t ref; 782 rxrpc_seq_t seq; /* Sequence number of this packet */ 783 unsigned int call_debug_id; 784 unsigned int debug_id; 785 unsigned int len; /* Amount of data in buffer */ 786 unsigned int space; /* Remaining data space */ 787 unsigned int offset; /* Offset of fill point */ 788 unsigned long flags; 789 #define RXRPC_TXBUF_LAST 0 /* Set if last packet in Tx phase */ 790 #define RXRPC_TXBUF_RESENT 1 /* Set if has been resent */ 791 u8 /*enum rxrpc_propose_ack_trace*/ ack_why; /* If ack, why */ 792 struct { 793 /* The packet for encrypting and DMA'ing. We align it such 794 * that data[] aligns correctly for any crypto blocksize. 795 */ 796 u8 pad[64 - sizeof(struct rxrpc_wire_header)]; 797 struct rxrpc_wire_header wire; /* Network-ready header */ 798 union { 799 u8 data[RXRPC_JUMBO_DATALEN]; /* Data packet */ 800 struct { 801 struct rxrpc_ackpacket ack; 802 DECLARE_FLEX_ARRAY(u8, acks); 803 }; 804 }; 805 } __aligned(64); 806 }; 807 808 static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb) 809 { 810 return txb->wire.flags & RXRPC_CLIENT_INITIATED; 811 } 812 813 static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb) 814 { 815 return !rxrpc_sending_to_server(txb); 816 } 817 818 #include <trace/events/rxrpc.h> 819 820 /* 821 * af_rxrpc.c 822 */ 823 extern atomic_t rxrpc_n_rx_skbs; 824 extern struct workqueue_struct *rxrpc_workqueue; 825 826 /* 827 * call_accept.c 828 */ 829 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t); 830 void rxrpc_discard_prealloc(struct rxrpc_sock *); 831 bool rxrpc_new_incoming_call(struct rxrpc_local *local, 832 struct rxrpc_peer *peer, 833 struct rxrpc_connection *conn, 834 struct sockaddr_rxrpc *peer_srx, 835 struct sk_buff *skb); 836 void rxrpc_accept_incoming_calls(struct rxrpc_local *); 837 int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long); 838 839 /* 840 * call_event.c 841 */ 842 void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial, 843 enum rxrpc_propose_ack_trace why); 844 void rxrpc_send_ACK(struct rxrpc_call *, u8, rxrpc_serial_t, enum rxrpc_propose_ack_trace); 845 void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t, 846 enum rxrpc_propose_ack_trace); 847 void rxrpc_shrink_call_tx_buffer(struct rxrpc_call *); 848 void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb); 849 850 void rxrpc_reduce_call_timer(struct rxrpc_call *call, 851 unsigned long expire_at, 852 unsigned long now, 853 enum rxrpc_timer_trace why); 854 855 bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb); 856 857 /* 858 * call_object.c 859 */ 860 extern const char *const rxrpc_call_states[]; 861 extern const char *const rxrpc_call_completions[]; 862 extern struct kmem_cache *rxrpc_call_jar; 863 864 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what); 865 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long); 866 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int); 867 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *, 868 struct rxrpc_conn_parameters *, 869 struct sockaddr_rxrpc *, 870 struct rxrpc_call_params *, gfp_t, 871 unsigned int); 872 void rxrpc_start_call_timer(struct rxrpc_call *call); 873 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *, 874 struct sk_buff *); 875 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *); 876 void rxrpc_release_calls_on_socket(struct rxrpc_sock *); 877 void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace); 878 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 879 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 880 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace); 881 void rxrpc_cleanup_call(struct rxrpc_call *); 882 void rxrpc_destroy_all_calls(struct rxrpc_net *); 883 884 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call) 885 { 886 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags); 887 } 888 889 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call) 890 { 891 return !rxrpc_is_service_call(call); 892 } 893 894 /* 895 * call_state.c 896 */ 897 bool rxrpc_set_call_completion(struct rxrpc_call *call, 898 enum rxrpc_call_completion compl, 899 u32 abort_code, 900 int error); 901 bool rxrpc_call_completed(struct rxrpc_call *call); 902 bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq, 903 u32 abort_code, int error, enum rxrpc_abort_reason why); 904 void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl, 905 int error); 906 907 static inline void rxrpc_set_call_state(struct rxrpc_call *call, 908 enum rxrpc_call_state state) 909 { 910 /* Order write of completion info before write of ->state. */ 911 smp_store_release(&call->_state, state); 912 wake_up(&call->waitq); 913 } 914 915 static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call) 916 { 917 return call->_state; /* Only inside I/O thread */ 918 } 919 920 static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call) 921 { 922 return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; 923 } 924 925 static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call) 926 { 927 /* Order read ->state before read of completion info. */ 928 return smp_load_acquire(&call->_state); 929 } 930 931 static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call) 932 { 933 return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; 934 } 935 936 static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call) 937 { 938 return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED; 939 } 940 941 /* 942 * conn_client.c 943 */ 944 extern unsigned int rxrpc_reap_client_connections; 945 extern unsigned long rxrpc_conn_idle_client_expiry; 946 extern unsigned long rxrpc_conn_idle_client_fast_expiry; 947 948 void rxrpc_purge_client_connections(struct rxrpc_local *local); 949 struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 950 void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 951 int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp); 952 void rxrpc_connect_client_calls(struct rxrpc_local *local); 953 void rxrpc_expose_client_call(struct rxrpc_call *); 954 void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *); 955 void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle); 956 void rxrpc_put_client_conn(struct rxrpc_connection *, enum rxrpc_conn_trace); 957 void rxrpc_discard_expired_client_conns(struct rxrpc_local *local); 958 void rxrpc_clean_up_local_conns(struct rxrpc_local *); 959 960 /* 961 * conn_event.c 962 */ 963 void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb, 964 unsigned int channel); 965 int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb, 966 s32 abort_code, int err, enum rxrpc_abort_reason why); 967 void rxrpc_process_connection(struct work_struct *); 968 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool); 969 bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb); 970 void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb); 971 972 static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn) 973 { 974 /* Order reading the abort info after the state check. */ 975 return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED; 976 } 977 978 /* 979 * conn_object.c 980 */ 981 extern unsigned int rxrpc_connection_expiry; 982 extern unsigned int rxrpc_closed_conn_expiry; 983 984 void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why); 985 struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t); 986 struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *, 987 struct sockaddr_rxrpc *, 988 struct sk_buff *); 989 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *); 990 void rxrpc_disconnect_call(struct rxrpc_call *); 991 void rxrpc_kill_client_conn(struct rxrpc_connection *); 992 void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace); 993 void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 994 struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *, 995 enum rxrpc_conn_trace); 996 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *, 997 enum rxrpc_conn_trace); 998 void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 999 void rxrpc_service_connection_reaper(struct work_struct *); 1000 void rxrpc_destroy_all_connections(struct rxrpc_net *); 1001 1002 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn) 1003 { 1004 return conn->out_clientflag; 1005 } 1006 1007 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn) 1008 { 1009 return !rxrpc_conn_is_client(conn); 1010 } 1011 1012 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn, 1013 unsigned long expire_at) 1014 { 1015 timer_reduce(&conn->timer, expire_at); 1016 } 1017 1018 /* 1019 * conn_service.c 1020 */ 1021 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *, 1022 struct sk_buff *); 1023 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t); 1024 void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *, 1025 const struct rxrpc_security *, struct sk_buff *); 1026 void rxrpc_unpublish_service_conn(struct rxrpc_connection *); 1027 1028 /* 1029 * input.c 1030 */ 1031 void rxrpc_congestion_degrade(struct rxrpc_call *); 1032 void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *); 1033 void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *); 1034 1035 /* 1036 * io_thread.c 1037 */ 1038 int rxrpc_encap_rcv(struct sock *, struct sk_buff *); 1039 void rxrpc_error_report(struct sock *); 1040 bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why, 1041 s32 abort_code, int err); 1042 int rxrpc_io_thread(void *data); 1043 static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local) 1044 { 1045 wake_up_process(local->io_thread); 1046 } 1047 1048 static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why) 1049 { 1050 return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO); 1051 } 1052 1053 /* 1054 * insecure.c 1055 */ 1056 extern const struct rxrpc_security rxrpc_no_security; 1057 1058 /* 1059 * key.c 1060 */ 1061 extern struct key_type key_type_rxrpc; 1062 1063 int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int); 1064 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t, 1065 u32); 1066 1067 /* 1068 * local_event.c 1069 */ 1070 void rxrpc_send_version_request(struct rxrpc_local *local, 1071 struct rxrpc_host_header *hdr, 1072 struct sk_buff *skb); 1073 1074 /* 1075 * local_object.c 1076 */ 1077 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *); 1078 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace); 1079 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace); 1080 void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace); 1081 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace); 1082 void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace); 1083 void rxrpc_destroy_local(struct rxrpc_local *local); 1084 void rxrpc_destroy_all_locals(struct rxrpc_net *); 1085 1086 static inline bool __rxrpc_use_local(struct rxrpc_local *local, 1087 enum rxrpc_local_trace why) 1088 { 1089 int r, u; 1090 1091 r = refcount_read(&local->ref); 1092 u = atomic_fetch_add_unless(&local->active_users, 1, 0); 1093 trace_rxrpc_local(local->debug_id, why, r, u); 1094 return u != 0; 1095 } 1096 1097 static inline void rxrpc_see_local(struct rxrpc_local *local, 1098 enum rxrpc_local_trace why) 1099 { 1100 int r, u; 1101 1102 r = refcount_read(&local->ref); 1103 u = atomic_read(&local->active_users); 1104 trace_rxrpc_local(local->debug_id, why, r, u); 1105 } 1106 1107 /* 1108 * misc.c 1109 */ 1110 extern unsigned int rxrpc_max_backlog __read_mostly; 1111 extern unsigned long rxrpc_soft_ack_delay; 1112 extern unsigned long rxrpc_idle_ack_delay; 1113 extern unsigned int rxrpc_rx_window_size; 1114 extern unsigned int rxrpc_rx_mtu; 1115 extern unsigned int rxrpc_rx_jumbo_max; 1116 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY 1117 extern unsigned long rxrpc_inject_rx_delay; 1118 #endif 1119 1120 /* 1121 * net_ns.c 1122 */ 1123 extern unsigned int rxrpc_net_id; 1124 extern struct pernet_operations rxrpc_net_ops; 1125 1126 static inline struct rxrpc_net *rxrpc_net(struct net *net) 1127 { 1128 return net_generic(net, rxrpc_net_id); 1129 } 1130 1131 /* 1132 * output.c 1133 */ 1134 int rxrpc_send_ack_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb); 1135 int rxrpc_send_abort_packet(struct rxrpc_call *); 1136 int rxrpc_send_data_packet(struct rxrpc_call *, struct rxrpc_txbuf *); 1137 void rxrpc_send_conn_abort(struct rxrpc_connection *conn); 1138 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb); 1139 void rxrpc_send_keepalive(struct rxrpc_peer *); 1140 void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb); 1141 1142 /* 1143 * peer_event.c 1144 */ 1145 void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *); 1146 void rxrpc_peer_keepalive_worker(struct work_struct *); 1147 1148 /* 1149 * peer_object.c 1150 */ 1151 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *, 1152 const struct sockaddr_rxrpc *); 1153 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local, 1154 struct sockaddr_rxrpc *srx, gfp_t gfp); 1155 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t, 1156 enum rxrpc_peer_trace); 1157 void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer); 1158 void rxrpc_destroy_all_peers(struct rxrpc_net *); 1159 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1160 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace); 1161 void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1162 1163 /* 1164 * proc.c 1165 */ 1166 extern const struct seq_operations rxrpc_call_seq_ops; 1167 extern const struct seq_operations rxrpc_connection_seq_ops; 1168 extern const struct seq_operations rxrpc_peer_seq_ops; 1169 extern const struct seq_operations rxrpc_local_seq_ops; 1170 1171 /* 1172 * recvmsg.c 1173 */ 1174 void rxrpc_notify_socket(struct rxrpc_call *); 1175 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int); 1176 1177 /* 1178 * Abort a call due to a protocol error. 1179 */ 1180 static inline int rxrpc_abort_eproto(struct rxrpc_call *call, 1181 struct sk_buff *skb, 1182 s32 abort_code, 1183 enum rxrpc_abort_reason why) 1184 { 1185 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 1186 1187 rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why); 1188 return -EPROTO; 1189 } 1190 1191 /* 1192 * rtt.c 1193 */ 1194 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, int, 1195 rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t); 1196 unsigned long rxrpc_get_rto_backoff(struct rxrpc_peer *, bool); 1197 void rxrpc_peer_init_rtt(struct rxrpc_peer *); 1198 1199 /* 1200 * rxkad.c 1201 */ 1202 #ifdef CONFIG_RXKAD 1203 extern const struct rxrpc_security rxkad; 1204 #endif 1205 1206 /* 1207 * security.c 1208 */ 1209 int __init rxrpc_init_security(void); 1210 const struct rxrpc_security *rxrpc_security_lookup(u8); 1211 void rxrpc_exit_security(void); 1212 int rxrpc_init_client_call_security(struct rxrpc_call *); 1213 int rxrpc_init_client_conn_security(struct rxrpc_connection *); 1214 const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *, 1215 struct sk_buff *); 1216 struct key *rxrpc_look_up_server_security(struct rxrpc_connection *, 1217 struct sk_buff *, u32, u32); 1218 1219 /* 1220 * sendmsg.c 1221 */ 1222 bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error, 1223 enum rxrpc_abort_reason why); 1224 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t); 1225 1226 /* 1227 * server_key.c 1228 */ 1229 extern struct key_type key_type_rxrpc_s; 1230 1231 int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int); 1232 1233 /* 1234 * skbuff.c 1235 */ 1236 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *); 1237 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace); 1238 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace); 1239 void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace); 1240 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace); 1241 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace); 1242 void rxrpc_purge_queue(struct sk_buff_head *); 1243 1244 /* 1245 * stats.c 1246 */ 1247 int rxrpc_stats_show(struct seq_file *seq, void *v); 1248 int rxrpc_stats_clear(struct file *file, char *buf, size_t size); 1249 1250 #define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s) 1251 #define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s) 1252 1253 /* 1254 * sysctl.c 1255 */ 1256 #ifdef CONFIG_SYSCTL 1257 extern int __init rxrpc_sysctl_init(void); 1258 extern void rxrpc_sysctl_exit(void); 1259 #else 1260 static inline int __init rxrpc_sysctl_init(void) { return 0; } 1261 static inline void rxrpc_sysctl_exit(void) {} 1262 #endif 1263 1264 /* 1265 * txbuf.c 1266 */ 1267 extern atomic_t rxrpc_nr_txbuf; 1268 struct rxrpc_txbuf *rxrpc_alloc_txbuf(struct rxrpc_call *call, u8 packet_type, 1269 gfp_t gfp); 1270 void rxrpc_get_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1271 void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1272 void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1273 1274 /* 1275 * utils.c 1276 */ 1277 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *); 1278 1279 static inline bool before(u32 seq1, u32 seq2) 1280 { 1281 return (s32)(seq1 - seq2) < 0; 1282 } 1283 static inline bool before_eq(u32 seq1, u32 seq2) 1284 { 1285 return (s32)(seq1 - seq2) <= 0; 1286 } 1287 static inline bool after(u32 seq1, u32 seq2) 1288 { 1289 return (s32)(seq1 - seq2) > 0; 1290 } 1291 static inline bool after_eq(u32 seq1, u32 seq2) 1292 { 1293 return (s32)(seq1 - seq2) >= 0; 1294 } 1295 1296 /* 1297 * debug tracing 1298 */ 1299 extern unsigned int rxrpc_debug; 1300 1301 #define dbgprintk(FMT,...) \ 1302 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1303 1304 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1305 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1306 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1307 1308 1309 #if defined(__KDEBUG) 1310 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1311 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1312 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1313 1314 #elif defined(CONFIG_AF_RXRPC_DEBUG) 1315 #define RXRPC_DEBUG_KENTER 0x01 1316 #define RXRPC_DEBUG_KLEAVE 0x02 1317 #define RXRPC_DEBUG_KDEBUG 0x04 1318 1319 #define _enter(FMT,...) \ 1320 do { \ 1321 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \ 1322 kenter(FMT,##__VA_ARGS__); \ 1323 } while (0) 1324 1325 #define _leave(FMT,...) \ 1326 do { \ 1327 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \ 1328 kleave(FMT,##__VA_ARGS__); \ 1329 } while (0) 1330 1331 #define _debug(FMT,...) \ 1332 do { \ 1333 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \ 1334 kdebug(FMT,##__VA_ARGS__); \ 1335 } while (0) 1336 1337 #else 1338 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1339 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1340 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1341 #endif 1342 1343 /* 1344 * debug assertion checking 1345 */ 1346 #if 1 // defined(__KDEBUGALL) 1347 1348 #define ASSERT(X) \ 1349 do { \ 1350 if (unlikely(!(X))) { \ 1351 pr_err("Assertion failed\n"); \ 1352 BUG(); \ 1353 } \ 1354 } while (0) 1355 1356 #define ASSERTCMP(X, OP, Y) \ 1357 do { \ 1358 __typeof__(X) _x = (X); \ 1359 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1360 if (unlikely(!(_x OP _y))) { \ 1361 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1362 (unsigned long)_x, (unsigned long)_x, #OP, \ 1363 (unsigned long)_y, (unsigned long)_y); \ 1364 BUG(); \ 1365 } \ 1366 } while (0) 1367 1368 #define ASSERTIF(C, X) \ 1369 do { \ 1370 if (unlikely((C) && !(X))) { \ 1371 pr_err("Assertion failed\n"); \ 1372 BUG(); \ 1373 } \ 1374 } while (0) 1375 1376 #define ASSERTIFCMP(C, X, OP, Y) \ 1377 do { \ 1378 __typeof__(X) _x = (X); \ 1379 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1380 if (unlikely((C) && !(_x OP _y))) { \ 1381 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1382 (unsigned long)_x, (unsigned long)_x, #OP, \ 1383 (unsigned long)_y, (unsigned long)_y); \ 1384 BUG(); \ 1385 } \ 1386 } while (0) 1387 1388 #else 1389 1390 #define ASSERT(X) \ 1391 do { \ 1392 } while (0) 1393 1394 #define ASSERTCMP(X, OP, Y) \ 1395 do { \ 1396 } while (0) 1397 1398 #define ASSERTIF(C, X) \ 1399 do { \ 1400 } while (0) 1401 1402 #define ASSERTIFCMP(C, X, OP, Y) \ 1403 do { \ 1404 } while (0) 1405 1406 #endif /* __KDEBUGALL */ 1407