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 u32 hard_timo; /* Maximum lifetime or 0 (jif) */ 620 struct timer_list timer; /* Combined event timer */ 621 struct work_struct destroyer; /* In-process-context destroyer */ 622 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */ 623 struct list_head link; /* link in master call list */ 624 struct list_head wait_link; /* Link in local->new_client_calls */ 625 struct hlist_node error_link; /* link in error distribution list */ 626 struct list_head accept_link; /* Link in rx->acceptq */ 627 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */ 628 struct list_head sock_link; /* Link in rx->sock_calls */ 629 struct rb_node sock_node; /* Node in rx->calls */ 630 struct list_head attend_link; /* Link in local->call_attend_q */ 631 struct rxrpc_txbuf *tx_pending; /* Tx buffer being filled */ 632 wait_queue_head_t waitq; /* Wait queue for channel or Tx */ 633 s64 tx_total_len; /* Total length left to be transmitted (or -1) */ 634 unsigned long user_call_ID; /* user-defined call ID */ 635 unsigned long flags; 636 unsigned long events; 637 spinlock_t notify_lock; /* Kernel notification lock */ 638 unsigned int send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */ 639 s32 send_abort; /* Abort code to be sent */ 640 short send_abort_err; /* Error to be associated with the abort */ 641 rxrpc_seq_t send_abort_seq; /* DATA packet that incurred the abort (or 0) */ 642 s32 abort_code; /* Local/remote abort code */ 643 int error; /* Local error incurred */ 644 enum rxrpc_call_state _state; /* Current state of call (needs barrier) */ 645 enum rxrpc_call_completion completion; /* Call completion condition */ 646 refcount_t ref; 647 u8 security_ix; /* Security type */ 648 enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */ 649 u32 call_id; /* call ID on connection */ 650 u32 cid; /* connection ID plus channel index */ 651 u32 security_level; /* Security level selected */ 652 int debug_id; /* debug ID for printks */ 653 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */ 654 unsigned short rx_pkt_len; /* Current recvmsg packet len */ 655 656 /* Transmitted data tracking. */ 657 spinlock_t tx_lock; /* Transmit queue lock */ 658 struct list_head tx_sendmsg; /* Sendmsg prepared packets */ 659 struct list_head tx_buffer; /* Buffer of transmissible packets */ 660 rxrpc_seq_t tx_bottom; /* First packet in buffer */ 661 rxrpc_seq_t tx_transmitted; /* Highest packet transmitted */ 662 rxrpc_seq_t tx_prepared; /* Highest Tx slot prepared. */ 663 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */ 664 u16 tx_backoff; /* Delay to insert due to Tx failure */ 665 u8 tx_winsize; /* Maximum size of Tx window */ 666 #define RXRPC_TX_MAX_WINDOW 128 667 ktime_t tx_last_sent; /* Last time a transmission occurred */ 668 669 /* Received data tracking */ 670 struct sk_buff_head recvmsg_queue; /* Queue of packets ready for recvmsg() */ 671 struct sk_buff_head rx_oos_queue; /* Queue of out of sequence packets */ 672 673 rxrpc_seq_t rx_highest_seq; /* Higest sequence number received */ 674 rxrpc_seq_t rx_consumed; /* Highest packet consumed */ 675 rxrpc_serial_t rx_serial; /* Highest serial received for this call */ 676 u8 rx_winsize; /* Size of Rx window */ 677 678 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS 679 * is fixed, we keep these numbers in terms of segments (ie. DATA 680 * packets) rather than bytes. 681 */ 682 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN 683 #define RXRPC_MIN_CWND (RXRPC_TX_SMSS > 2190 ? 2 : RXRPC_TX_SMSS > 1095 ? 3 : 4) 684 u8 cong_cwnd; /* Congestion window size */ 685 u8 cong_extra; /* Extra to send for congestion management */ 686 u8 cong_ssthresh; /* Slow-start threshold */ 687 enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */ 688 u8 cong_dup_acks; /* Count of ACKs showing missing packets */ 689 u8 cong_cumul_acks; /* Cumulative ACK count */ 690 ktime_t cong_tstamp; /* Last time cwnd was changed */ 691 692 /* Receive-phase ACK management (ACKs we send). */ 693 u8 ackr_reason; /* reason to ACK */ 694 u16 ackr_sack_base; /* Starting slot in SACK table ring */ 695 rxrpc_serial_t ackr_serial; /* serial of packet being ACK'd */ 696 rxrpc_seq_t ackr_window; /* Base of SACK window */ 697 rxrpc_seq_t ackr_wtop; /* Base of SACK window */ 698 unsigned int ackr_nr_unacked; /* Number of unacked packets */ 699 atomic_t ackr_nr_consumed; /* Number of packets needing hard ACK */ 700 struct { 701 #define RXRPC_SACK_SIZE 256 702 /* SACK table for soft-acked packets */ 703 u8 ackr_sack_table[RXRPC_SACK_SIZE]; 704 } __aligned(8); 705 706 /* RTT management */ 707 rxrpc_serial_t rtt_serial[4]; /* Serial number of DATA or PING sent */ 708 ktime_t rtt_sent_at[4]; /* Time packet sent */ 709 unsigned long rtt_avail; /* Mask of available slots in bits 0-3, 710 * Mask of pending samples in 8-11 */ 711 #define RXRPC_CALL_RTT_AVAIL_MASK 0xf 712 #define RXRPC_CALL_RTT_PEND_SHIFT 8 713 714 /* Transmission-phase ACK management (ACKs we've received). */ 715 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */ 716 rxrpc_seq_t acks_first_seq; /* first sequence number received */ 717 rxrpc_seq_t acks_prev_seq; /* Highest previousPacket received */ 718 rxrpc_seq_t acks_hard_ack; /* Latest hard-ack point */ 719 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */ 720 rxrpc_serial_t acks_highest_serial; /* Highest serial number ACK'd */ 721 }; 722 723 /* 724 * Summary of a new ACK and the changes it made to the Tx buffer packet states. 725 */ 726 struct rxrpc_ack_summary { 727 u16 nr_acks; /* Number of ACKs in packet */ 728 u16 nr_new_acks; /* Number of new ACKs in packet */ 729 u16 nr_rot_new_acks; /* Number of rotated new ACKs */ 730 u8 ack_reason; 731 bool saw_nacks; /* Saw NACKs in packet */ 732 bool new_low_nack; /* T if new low NACK found */ 733 bool retrans_timeo; /* T if reTx due to timeout happened */ 734 u8 flight_size; /* Number of unreceived transmissions */ 735 /* Place to stash values for tracing */ 736 enum rxrpc_congest_mode mode:8; 737 u8 cwnd; 738 u8 ssthresh; 739 u8 dup_acks; 740 u8 cumulative_acks; 741 }; 742 743 /* 744 * sendmsg() cmsg-specified parameters. 745 */ 746 enum rxrpc_command { 747 RXRPC_CMD_SEND_DATA, /* send data message */ 748 RXRPC_CMD_SEND_ABORT, /* request abort generation */ 749 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */ 750 RXRPC_CMD_CHARGE_ACCEPT, /* [server] charge accept preallocation */ 751 }; 752 753 struct rxrpc_call_params { 754 s64 tx_total_len; /* Total Tx data length (if send data) */ 755 unsigned long user_call_ID; /* User's call ID */ 756 struct { 757 u32 hard; /* Maximum lifetime (sec) */ 758 u32 idle; /* Max time since last data packet (msec) */ 759 u32 normal; /* Max time since last call packet (msec) */ 760 } timeouts; 761 u8 nr_timeouts; /* Number of timeouts specified */ 762 bool kernel; /* T if kernel is making the call */ 763 enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */ 764 }; 765 766 struct rxrpc_send_params { 767 struct rxrpc_call_params call; 768 u32 abort_code; /* Abort code to Tx (if abort) */ 769 enum rxrpc_command command : 8; /* The command to implement */ 770 bool exclusive; /* Shared or exclusive call */ 771 bool upgrade; /* If the connection is upgradeable */ 772 }; 773 774 /* 775 * Buffer of data to be output as a packet. 776 */ 777 struct rxrpc_txbuf { 778 struct rcu_head rcu; 779 struct list_head call_link; /* Link in call->tx_sendmsg/tx_buffer */ 780 struct list_head tx_link; /* Link in live Enc queue or Tx queue */ 781 ktime_t last_sent; /* Time at which last transmitted */ 782 refcount_t ref; 783 rxrpc_seq_t seq; /* Sequence number of this packet */ 784 unsigned int call_debug_id; 785 unsigned int debug_id; 786 unsigned int len; /* Amount of data in buffer */ 787 unsigned int space; /* Remaining data space */ 788 unsigned int offset; /* Offset of fill point */ 789 unsigned long flags; 790 #define RXRPC_TXBUF_LAST 0 /* Set if last packet in Tx phase */ 791 #define RXRPC_TXBUF_RESENT 1 /* Set if has been resent */ 792 u8 /*enum rxrpc_propose_ack_trace*/ ack_why; /* If ack, why */ 793 struct { 794 /* The packet for encrypting and DMA'ing. We align it such 795 * that data[] aligns correctly for any crypto blocksize. 796 */ 797 u8 pad[64 - sizeof(struct rxrpc_wire_header)]; 798 struct rxrpc_wire_header wire; /* Network-ready header */ 799 union { 800 u8 data[RXRPC_JUMBO_DATALEN]; /* Data packet */ 801 struct { 802 struct rxrpc_ackpacket ack; 803 DECLARE_FLEX_ARRAY(u8, acks); 804 }; 805 }; 806 } __aligned(64); 807 }; 808 809 static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb) 810 { 811 return txb->wire.flags & RXRPC_CLIENT_INITIATED; 812 } 813 814 static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb) 815 { 816 return !rxrpc_sending_to_server(txb); 817 } 818 819 #include <trace/events/rxrpc.h> 820 821 /* 822 * af_rxrpc.c 823 */ 824 extern atomic_t rxrpc_n_rx_skbs; 825 extern struct workqueue_struct *rxrpc_workqueue; 826 827 /* 828 * call_accept.c 829 */ 830 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t); 831 void rxrpc_discard_prealloc(struct rxrpc_sock *); 832 bool rxrpc_new_incoming_call(struct rxrpc_local *local, 833 struct rxrpc_peer *peer, 834 struct rxrpc_connection *conn, 835 struct sockaddr_rxrpc *peer_srx, 836 struct sk_buff *skb); 837 void rxrpc_accept_incoming_calls(struct rxrpc_local *); 838 int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long); 839 840 /* 841 * call_event.c 842 */ 843 void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial, 844 enum rxrpc_propose_ack_trace why); 845 void rxrpc_send_ACK(struct rxrpc_call *, u8, rxrpc_serial_t, enum rxrpc_propose_ack_trace); 846 void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t, 847 enum rxrpc_propose_ack_trace); 848 void rxrpc_shrink_call_tx_buffer(struct rxrpc_call *); 849 void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb); 850 851 void rxrpc_reduce_call_timer(struct rxrpc_call *call, 852 unsigned long expire_at, 853 unsigned long now, 854 enum rxrpc_timer_trace why); 855 856 bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb); 857 858 /* 859 * call_object.c 860 */ 861 extern const char *const rxrpc_call_states[]; 862 extern const char *const rxrpc_call_completions[]; 863 extern struct kmem_cache *rxrpc_call_jar; 864 865 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what); 866 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long); 867 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int); 868 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *, 869 struct rxrpc_conn_parameters *, 870 struct sockaddr_rxrpc *, 871 struct rxrpc_call_params *, gfp_t, 872 unsigned int); 873 void rxrpc_start_call_timer(struct rxrpc_call *call); 874 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *, 875 struct sk_buff *); 876 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *); 877 void rxrpc_release_calls_on_socket(struct rxrpc_sock *); 878 void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace); 879 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 880 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 881 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace); 882 void rxrpc_cleanup_call(struct rxrpc_call *); 883 void rxrpc_destroy_all_calls(struct rxrpc_net *); 884 885 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call) 886 { 887 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags); 888 } 889 890 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call) 891 { 892 return !rxrpc_is_service_call(call); 893 } 894 895 /* 896 * call_state.c 897 */ 898 bool rxrpc_set_call_completion(struct rxrpc_call *call, 899 enum rxrpc_call_completion compl, 900 u32 abort_code, 901 int error); 902 bool rxrpc_call_completed(struct rxrpc_call *call); 903 bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq, 904 u32 abort_code, int error, enum rxrpc_abort_reason why); 905 void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl, 906 int error); 907 908 static inline void rxrpc_set_call_state(struct rxrpc_call *call, 909 enum rxrpc_call_state state) 910 { 911 /* Order write of completion info before write of ->state. */ 912 smp_store_release(&call->_state, state); 913 wake_up(&call->waitq); 914 } 915 916 static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call) 917 { 918 return call->_state; /* Only inside I/O thread */ 919 } 920 921 static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call) 922 { 923 return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; 924 } 925 926 static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call) 927 { 928 /* Order read ->state before read of completion info. */ 929 return smp_load_acquire(&call->_state); 930 } 931 932 static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call) 933 { 934 return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; 935 } 936 937 static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call) 938 { 939 return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED; 940 } 941 942 /* 943 * conn_client.c 944 */ 945 extern unsigned int rxrpc_reap_client_connections; 946 extern unsigned long rxrpc_conn_idle_client_expiry; 947 extern unsigned long rxrpc_conn_idle_client_fast_expiry; 948 949 void rxrpc_purge_client_connections(struct rxrpc_local *local); 950 struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 951 void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 952 int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp); 953 void rxrpc_connect_client_calls(struct rxrpc_local *local); 954 void rxrpc_expose_client_call(struct rxrpc_call *); 955 void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *); 956 void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle); 957 void rxrpc_put_client_conn(struct rxrpc_connection *, enum rxrpc_conn_trace); 958 void rxrpc_discard_expired_client_conns(struct rxrpc_local *local); 959 void rxrpc_clean_up_local_conns(struct rxrpc_local *); 960 961 /* 962 * conn_event.c 963 */ 964 void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb, 965 unsigned int channel); 966 int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb, 967 s32 abort_code, int err, enum rxrpc_abort_reason why); 968 void rxrpc_process_connection(struct work_struct *); 969 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool); 970 bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb); 971 void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb); 972 973 static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn) 974 { 975 /* Order reading the abort info after the state check. */ 976 return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED; 977 } 978 979 /* 980 * conn_object.c 981 */ 982 extern unsigned int rxrpc_connection_expiry; 983 extern unsigned int rxrpc_closed_conn_expiry; 984 985 void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why); 986 struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t); 987 struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *, 988 struct sockaddr_rxrpc *, 989 struct sk_buff *); 990 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *); 991 void rxrpc_disconnect_call(struct rxrpc_call *); 992 void rxrpc_kill_client_conn(struct rxrpc_connection *); 993 void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace); 994 void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 995 struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *, 996 enum rxrpc_conn_trace); 997 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *, 998 enum rxrpc_conn_trace); 999 void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 1000 void rxrpc_service_connection_reaper(struct work_struct *); 1001 void rxrpc_destroy_all_connections(struct rxrpc_net *); 1002 1003 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn) 1004 { 1005 return conn->out_clientflag; 1006 } 1007 1008 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn) 1009 { 1010 return !rxrpc_conn_is_client(conn); 1011 } 1012 1013 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn, 1014 unsigned long expire_at) 1015 { 1016 timer_reduce(&conn->timer, expire_at); 1017 } 1018 1019 /* 1020 * conn_service.c 1021 */ 1022 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *, 1023 struct sk_buff *); 1024 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t); 1025 void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *, 1026 const struct rxrpc_security *, struct sk_buff *); 1027 void rxrpc_unpublish_service_conn(struct rxrpc_connection *); 1028 1029 /* 1030 * input.c 1031 */ 1032 void rxrpc_congestion_degrade(struct rxrpc_call *); 1033 void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *); 1034 void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *); 1035 1036 /* 1037 * io_thread.c 1038 */ 1039 int rxrpc_encap_rcv(struct sock *, struct sk_buff *); 1040 void rxrpc_error_report(struct sock *); 1041 bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why, 1042 s32 abort_code, int err); 1043 int rxrpc_io_thread(void *data); 1044 static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local) 1045 { 1046 wake_up_process(local->io_thread); 1047 } 1048 1049 static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why) 1050 { 1051 return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO); 1052 } 1053 1054 /* 1055 * insecure.c 1056 */ 1057 extern const struct rxrpc_security rxrpc_no_security; 1058 1059 /* 1060 * key.c 1061 */ 1062 extern struct key_type key_type_rxrpc; 1063 1064 int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int); 1065 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t, 1066 u32); 1067 1068 /* 1069 * local_event.c 1070 */ 1071 void rxrpc_send_version_request(struct rxrpc_local *local, 1072 struct rxrpc_host_header *hdr, 1073 struct sk_buff *skb); 1074 1075 /* 1076 * local_object.c 1077 */ 1078 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *); 1079 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace); 1080 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace); 1081 void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace); 1082 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace); 1083 void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace); 1084 void rxrpc_destroy_local(struct rxrpc_local *local); 1085 void rxrpc_destroy_all_locals(struct rxrpc_net *); 1086 1087 static inline bool __rxrpc_use_local(struct rxrpc_local *local, 1088 enum rxrpc_local_trace why) 1089 { 1090 int r, u; 1091 1092 r = refcount_read(&local->ref); 1093 u = atomic_fetch_add_unless(&local->active_users, 1, 0); 1094 trace_rxrpc_local(local->debug_id, why, r, u); 1095 return u != 0; 1096 } 1097 1098 static inline void rxrpc_see_local(struct rxrpc_local *local, 1099 enum rxrpc_local_trace why) 1100 { 1101 int r, u; 1102 1103 r = refcount_read(&local->ref); 1104 u = atomic_read(&local->active_users); 1105 trace_rxrpc_local(local->debug_id, why, r, u); 1106 } 1107 1108 /* 1109 * misc.c 1110 */ 1111 extern unsigned int rxrpc_max_backlog __read_mostly; 1112 extern unsigned long rxrpc_soft_ack_delay; 1113 extern unsigned long rxrpc_idle_ack_delay; 1114 extern unsigned int rxrpc_rx_window_size; 1115 extern unsigned int rxrpc_rx_mtu; 1116 extern unsigned int rxrpc_rx_jumbo_max; 1117 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY 1118 extern unsigned long rxrpc_inject_rx_delay; 1119 #endif 1120 1121 /* 1122 * net_ns.c 1123 */ 1124 extern unsigned int rxrpc_net_id; 1125 extern struct pernet_operations rxrpc_net_ops; 1126 1127 static inline struct rxrpc_net *rxrpc_net(struct net *net) 1128 { 1129 return net_generic(net, rxrpc_net_id); 1130 } 1131 1132 /* 1133 * output.c 1134 */ 1135 int rxrpc_send_ack_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb); 1136 int rxrpc_send_abort_packet(struct rxrpc_call *); 1137 int rxrpc_send_data_packet(struct rxrpc_call *, struct rxrpc_txbuf *); 1138 void rxrpc_send_conn_abort(struct rxrpc_connection *conn); 1139 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb); 1140 void rxrpc_send_keepalive(struct rxrpc_peer *); 1141 void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb); 1142 1143 /* 1144 * peer_event.c 1145 */ 1146 void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *); 1147 void rxrpc_peer_keepalive_worker(struct work_struct *); 1148 1149 /* 1150 * peer_object.c 1151 */ 1152 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *, 1153 const struct sockaddr_rxrpc *); 1154 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local, 1155 struct sockaddr_rxrpc *srx, gfp_t gfp); 1156 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t, 1157 enum rxrpc_peer_trace); 1158 void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer); 1159 void rxrpc_destroy_all_peers(struct rxrpc_net *); 1160 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1161 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace); 1162 void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1163 1164 /* 1165 * proc.c 1166 */ 1167 extern const struct seq_operations rxrpc_call_seq_ops; 1168 extern const struct seq_operations rxrpc_connection_seq_ops; 1169 extern const struct seq_operations rxrpc_peer_seq_ops; 1170 extern const struct seq_operations rxrpc_local_seq_ops; 1171 1172 /* 1173 * recvmsg.c 1174 */ 1175 void rxrpc_notify_socket(struct rxrpc_call *); 1176 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int); 1177 1178 /* 1179 * Abort a call due to a protocol error. 1180 */ 1181 static inline int rxrpc_abort_eproto(struct rxrpc_call *call, 1182 struct sk_buff *skb, 1183 s32 abort_code, 1184 enum rxrpc_abort_reason why) 1185 { 1186 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 1187 1188 rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why); 1189 return -EPROTO; 1190 } 1191 1192 /* 1193 * rtt.c 1194 */ 1195 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, int, 1196 rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t); 1197 unsigned long rxrpc_get_rto_backoff(struct rxrpc_peer *, bool); 1198 void rxrpc_peer_init_rtt(struct rxrpc_peer *); 1199 1200 /* 1201 * rxkad.c 1202 */ 1203 #ifdef CONFIG_RXKAD 1204 extern const struct rxrpc_security rxkad; 1205 #endif 1206 1207 /* 1208 * security.c 1209 */ 1210 int __init rxrpc_init_security(void); 1211 const struct rxrpc_security *rxrpc_security_lookup(u8); 1212 void rxrpc_exit_security(void); 1213 int rxrpc_init_client_call_security(struct rxrpc_call *); 1214 int rxrpc_init_client_conn_security(struct rxrpc_connection *); 1215 const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *, 1216 struct sk_buff *); 1217 struct key *rxrpc_look_up_server_security(struct rxrpc_connection *, 1218 struct sk_buff *, u32, u32); 1219 1220 /* 1221 * sendmsg.c 1222 */ 1223 bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error, 1224 enum rxrpc_abort_reason why); 1225 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t); 1226 1227 /* 1228 * server_key.c 1229 */ 1230 extern struct key_type key_type_rxrpc_s; 1231 1232 int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int); 1233 1234 /* 1235 * skbuff.c 1236 */ 1237 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *); 1238 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace); 1239 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace); 1240 void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace); 1241 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace); 1242 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace); 1243 void rxrpc_purge_queue(struct sk_buff_head *); 1244 1245 /* 1246 * stats.c 1247 */ 1248 int rxrpc_stats_show(struct seq_file *seq, void *v); 1249 int rxrpc_stats_clear(struct file *file, char *buf, size_t size); 1250 1251 #define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s) 1252 #define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s) 1253 1254 /* 1255 * sysctl.c 1256 */ 1257 #ifdef CONFIG_SYSCTL 1258 extern int __init rxrpc_sysctl_init(void); 1259 extern void rxrpc_sysctl_exit(void); 1260 #else 1261 static inline int __init rxrpc_sysctl_init(void) { return 0; } 1262 static inline void rxrpc_sysctl_exit(void) {} 1263 #endif 1264 1265 /* 1266 * txbuf.c 1267 */ 1268 extern atomic_t rxrpc_nr_txbuf; 1269 struct rxrpc_txbuf *rxrpc_alloc_txbuf(struct rxrpc_call *call, u8 packet_type, 1270 gfp_t gfp); 1271 void rxrpc_get_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1272 void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1273 void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1274 1275 /* 1276 * utils.c 1277 */ 1278 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *); 1279 1280 static inline bool before(u32 seq1, u32 seq2) 1281 { 1282 return (s32)(seq1 - seq2) < 0; 1283 } 1284 static inline bool before_eq(u32 seq1, u32 seq2) 1285 { 1286 return (s32)(seq1 - seq2) <= 0; 1287 } 1288 static inline bool after(u32 seq1, u32 seq2) 1289 { 1290 return (s32)(seq1 - seq2) > 0; 1291 } 1292 static inline bool after_eq(u32 seq1, u32 seq2) 1293 { 1294 return (s32)(seq1 - seq2) >= 0; 1295 } 1296 1297 /* 1298 * debug tracing 1299 */ 1300 extern unsigned int rxrpc_debug; 1301 1302 #define dbgprintk(FMT,...) \ 1303 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1304 1305 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1306 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1307 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1308 1309 1310 #if defined(__KDEBUG) 1311 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1312 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1313 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1314 1315 #elif defined(CONFIG_AF_RXRPC_DEBUG) 1316 #define RXRPC_DEBUG_KENTER 0x01 1317 #define RXRPC_DEBUG_KLEAVE 0x02 1318 #define RXRPC_DEBUG_KDEBUG 0x04 1319 1320 #define _enter(FMT,...) \ 1321 do { \ 1322 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \ 1323 kenter(FMT,##__VA_ARGS__); \ 1324 } while (0) 1325 1326 #define _leave(FMT,...) \ 1327 do { \ 1328 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \ 1329 kleave(FMT,##__VA_ARGS__); \ 1330 } while (0) 1331 1332 #define _debug(FMT,...) \ 1333 do { \ 1334 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \ 1335 kdebug(FMT,##__VA_ARGS__); \ 1336 } while (0) 1337 1338 #else 1339 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1340 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1341 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1342 #endif 1343 1344 /* 1345 * debug assertion checking 1346 */ 1347 #if 1 // defined(__KDEBUGALL) 1348 1349 #define ASSERT(X) \ 1350 do { \ 1351 if (unlikely(!(X))) { \ 1352 pr_err("Assertion failed\n"); \ 1353 BUG(); \ 1354 } \ 1355 } while (0) 1356 1357 #define ASSERTCMP(X, OP, Y) \ 1358 do { \ 1359 __typeof__(X) _x = (X); \ 1360 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1361 if (unlikely(!(_x OP _y))) { \ 1362 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1363 (unsigned long)_x, (unsigned long)_x, #OP, \ 1364 (unsigned long)_y, (unsigned long)_y); \ 1365 BUG(); \ 1366 } \ 1367 } while (0) 1368 1369 #define ASSERTIF(C, X) \ 1370 do { \ 1371 if (unlikely((C) && !(X))) { \ 1372 pr_err("Assertion failed\n"); \ 1373 BUG(); \ 1374 } \ 1375 } while (0) 1376 1377 #define ASSERTIFCMP(C, X, OP, Y) \ 1378 do { \ 1379 __typeof__(X) _x = (X); \ 1380 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1381 if (unlikely((C) && !(_x OP _y))) { \ 1382 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1383 (unsigned long)_x, (unsigned long)_x, #OP, \ 1384 (unsigned long)_y, (unsigned long)_y); \ 1385 BUG(); \ 1386 } \ 1387 } while (0) 1388 1389 #else 1390 1391 #define ASSERT(X) \ 1392 do { \ 1393 } while (0) 1394 1395 #define ASSERTCMP(X, OP, Y) \ 1396 do { \ 1397 } while (0) 1398 1399 #define ASSERTIF(C, X) \ 1400 do { \ 1401 } while (0) 1402 1403 #define ASSERTIFCMP(C, X, OP, Y) \ 1404 do { \ 1405 } while (0) 1406 1407 #endif /* __KDEBUGALL */ 1408