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 union { 202 struct { 203 u16 offset; /* Offset of data */ 204 u16 len; /* Length of data */ 205 u8 flags; 206 #define RXRPC_RX_VERIFIED 0x01 207 }; 208 struct { 209 rxrpc_seq_t first_ack; /* First packet in acks table */ 210 u8 nr_acks; /* Number of acks+nacks */ 211 u8 nr_nacks; /* Number of nacks */ 212 }; 213 }; 214 struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */ 215 }; 216 217 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb) 218 219 /* 220 * RxRPC security module interface 221 */ 222 struct rxrpc_security { 223 const char *name; /* name of this service */ 224 u8 security_index; /* security type provided */ 225 u32 no_key_abort; /* Abort code indicating no key */ 226 227 /* Initialise a security service */ 228 int (*init)(void); 229 230 /* Clean up a security service */ 231 void (*exit)(void); 232 233 /* Parse the information from a server key */ 234 int (*preparse_server_key)(struct key_preparsed_payload *); 235 236 /* Clean up the preparse buffer after parsing a server key */ 237 void (*free_preparse_server_key)(struct key_preparsed_payload *); 238 239 /* Destroy the payload of a server key */ 240 void (*destroy_server_key)(struct key *); 241 242 /* Describe a server key */ 243 void (*describe_server_key)(const struct key *, struct seq_file *); 244 245 /* initialise a connection's security */ 246 int (*init_connection_security)(struct rxrpc_connection *, 247 struct rxrpc_key_token *); 248 249 /* Work out how much data we can store in a packet, given an estimate 250 * of the amount of data remaining. 251 */ 252 int (*how_much_data)(struct rxrpc_call *, size_t, 253 size_t *, size_t *, size_t *); 254 255 /* impose security on a packet */ 256 int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *); 257 258 /* verify the security on a received packet */ 259 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *); 260 261 /* Free crypto request on a call */ 262 void (*free_call_crypto)(struct rxrpc_call *); 263 264 /* issue a challenge */ 265 int (*issue_challenge)(struct rxrpc_connection *); 266 267 /* respond to a challenge */ 268 int (*respond_to_challenge)(struct rxrpc_connection *, 269 struct sk_buff *); 270 271 /* verify a response */ 272 int (*verify_response)(struct rxrpc_connection *, 273 struct sk_buff *); 274 275 /* clear connection security */ 276 void (*clear)(struct rxrpc_connection *); 277 }; 278 279 /* 280 * RxRPC local transport endpoint description 281 * - owned by a single AF_RXRPC socket 282 * - pointed to by transport socket struct sk_user_data 283 */ 284 struct rxrpc_local { 285 struct rcu_head rcu; 286 atomic_t active_users; /* Number of users of the local endpoint */ 287 refcount_t ref; /* Number of references to the structure */ 288 struct net *net; /* The network namespace */ 289 struct rxrpc_net *rxnet; /* Our bits in the network namespace */ 290 struct hlist_node link; 291 struct socket *socket; /* my UDP socket */ 292 struct task_struct *io_thread; 293 struct completion io_thread_ready; /* Indication that the I/O thread started */ 294 struct rxrpc_sock *service; /* Service(s) listening on this endpoint */ 295 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY 296 struct sk_buff_head rx_delay_queue; /* Delay injection queue */ 297 #endif 298 struct sk_buff_head rx_queue; /* Received packets */ 299 struct list_head conn_attend_q; /* Conns requiring immediate attention */ 300 struct list_head call_attend_q; /* Calls requiring immediate attention */ 301 302 struct rb_root client_bundles; /* Client connection bundles by socket params */ 303 spinlock_t client_bundles_lock; /* Lock for client_bundles */ 304 bool kill_all_client_conns; 305 struct list_head idle_client_conns; 306 struct timer_list client_conn_reap_timer; 307 unsigned long client_conn_flags; 308 #define RXRPC_CLIENT_CONN_REAP_TIMER 0 /* The client conn reap timer expired */ 309 310 spinlock_t lock; /* access lock */ 311 rwlock_t services_lock; /* lock for services list */ 312 int debug_id; /* debug ID for printks */ 313 bool dead; 314 bool service_closed; /* Service socket closed */ 315 struct idr conn_ids; /* List of connection IDs */ 316 struct list_head new_client_calls; /* Newly created client calls need connection */ 317 spinlock_t client_call_lock; /* Lock for ->new_client_calls */ 318 struct sockaddr_rxrpc srx; /* local address */ 319 }; 320 321 /* 322 * RxRPC remote transport endpoint definition 323 * - matched by local endpoint, remote port, address and protocol type 324 */ 325 struct rxrpc_peer { 326 struct rcu_head rcu; /* This must be first */ 327 refcount_t ref; 328 unsigned long hash_key; 329 struct hlist_node hash_link; 330 struct rxrpc_local *local; 331 struct hlist_head error_targets; /* targets for net error distribution */ 332 struct rb_root service_conns; /* Service connections */ 333 struct list_head keepalive_link; /* Link in net->peer_keepalive[] */ 334 time64_t last_tx_at; /* Last time packet sent here */ 335 seqlock_t service_conn_lock; 336 spinlock_t lock; /* access lock */ 337 unsigned int if_mtu; /* interface MTU for this peer */ 338 unsigned int mtu; /* network MTU for this peer */ 339 unsigned int maxdata; /* data size (MTU - hdrsize) */ 340 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */ 341 int debug_id; /* debug ID for printks */ 342 struct sockaddr_rxrpc srx; /* remote address */ 343 344 /* calculated RTT cache */ 345 #define RXRPC_RTT_CACHE_SIZE 32 346 spinlock_t rtt_input_lock; /* RTT lock for input routine */ 347 ktime_t rtt_last_req; /* Time of last RTT request */ 348 unsigned int rtt_count; /* Number of samples we've got */ 349 350 u32 srtt_us; /* smoothed round trip time << 3 in usecs */ 351 u32 mdev_us; /* medium deviation */ 352 u32 mdev_max_us; /* maximal mdev for the last rtt period */ 353 u32 rttvar_us; /* smoothed mdev_max */ 354 u32 rto_j; /* Retransmission timeout in jiffies */ 355 u8 backoff; /* Backoff timeout */ 356 357 u8 cong_ssthresh; /* Congestion slow-start threshold */ 358 }; 359 360 /* 361 * Keys for matching a connection. 362 */ 363 struct rxrpc_conn_proto { 364 union { 365 struct { 366 u32 epoch; /* epoch of this connection */ 367 u32 cid; /* connection ID */ 368 }; 369 u64 index_key; 370 }; 371 }; 372 373 struct rxrpc_conn_parameters { 374 struct rxrpc_local *local; /* Representation of local endpoint */ 375 struct key *key; /* Security details */ 376 bool exclusive; /* T if conn is exclusive */ 377 bool upgrade; /* T if service ID can be upgraded */ 378 u16 service_id; /* Service ID for this connection */ 379 u32 security_level; /* Security level selected */ 380 }; 381 382 /* 383 * Call completion condition (state == RXRPC_CALL_COMPLETE). 384 */ 385 enum rxrpc_call_completion { 386 RXRPC_CALL_SUCCEEDED, /* - Normal termination */ 387 RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */ 388 RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */ 389 RXRPC_CALL_LOCAL_ERROR, /* - call failed due to local error */ 390 RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */ 391 NR__RXRPC_CALL_COMPLETIONS 392 }; 393 394 /* 395 * Bits in the connection flags. 396 */ 397 enum rxrpc_conn_flag { 398 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */ 399 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */ 400 RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */ 401 RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */ 402 RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */ 403 RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */ 404 RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */ 405 }; 406 407 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \ 408 (1UL << RXRPC_CONN_FINAL_ACK_1) | \ 409 (1UL << RXRPC_CONN_FINAL_ACK_2) | \ 410 (1UL << RXRPC_CONN_FINAL_ACK_3)) 411 412 /* 413 * Events that can be raised upon a connection. 414 */ 415 enum rxrpc_conn_event { 416 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */ 417 RXRPC_CONN_EV_ABORT_CALLS, /* Abort attached calls */ 418 }; 419 420 /* 421 * The connection protocol state. 422 */ 423 enum rxrpc_conn_proto_state { 424 RXRPC_CONN_UNUSED, /* Connection not yet attempted */ 425 RXRPC_CONN_CLIENT_UNSECURED, /* Client connection needs security init */ 426 RXRPC_CONN_CLIENT, /* Client connection */ 427 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */ 428 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */ 429 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */ 430 RXRPC_CONN_SERVICE, /* Service secured connection */ 431 RXRPC_CONN_ABORTED, /* Conn aborted */ 432 RXRPC_CONN__NR_STATES 433 }; 434 435 /* 436 * RxRPC client connection bundle. 437 */ 438 struct rxrpc_bundle { 439 struct rxrpc_local *local; /* Representation of local endpoint */ 440 struct rxrpc_peer *peer; /* Remote endpoint */ 441 struct key *key; /* Security details */ 442 const struct rxrpc_security *security; /* applied security module */ 443 refcount_t ref; 444 atomic_t active; /* Number of active users */ 445 unsigned int debug_id; 446 u32 security_level; /* Security level selected */ 447 u16 service_id; /* Service ID for this connection */ 448 bool try_upgrade; /* True if the bundle is attempting upgrade */ 449 bool exclusive; /* T if conn is exclusive */ 450 bool upgrade; /* T if service ID can be upgraded */ 451 unsigned short alloc_error; /* Error from last conn allocation */ 452 struct rb_node local_node; /* Node in local->client_conns */ 453 struct list_head waiting_calls; /* Calls waiting for channels */ 454 unsigned long avail_chans; /* Mask of available channels */ 455 struct rxrpc_connection *conns[4]; /* The connections in the bundle (max 4) */ 456 }; 457 458 /* 459 * RxRPC connection definition 460 * - matched by { local, peer, epoch, conn_id, direction } 461 * - each connection can only handle four simultaneous calls 462 */ 463 struct rxrpc_connection { 464 struct rxrpc_conn_proto proto; 465 struct rxrpc_local *local; /* Representation of local endpoint */ 466 struct rxrpc_peer *peer; /* Remote endpoint */ 467 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ 468 struct key *key; /* Security details */ 469 struct list_head attend_link; /* Link in local->conn_attend_q */ 470 471 refcount_t ref; 472 atomic_t active; /* Active count for service conns */ 473 struct rcu_head rcu; 474 struct list_head cache_link; 475 476 unsigned char act_chans; /* Mask of active channels */ 477 struct rxrpc_channel { 478 unsigned long final_ack_at; /* Time at which to issue final ACK */ 479 struct rxrpc_call *call; /* Active call */ 480 unsigned int call_debug_id; /* call->debug_id */ 481 u32 call_id; /* ID of current call */ 482 u32 call_counter; /* Call ID counter */ 483 u32 last_call; /* ID of last call */ 484 u8 last_type; /* Type of last packet */ 485 union { 486 u32 last_seq; 487 u32 last_abort; 488 }; 489 } channels[RXRPC_MAXCALLS]; 490 491 struct timer_list timer; /* Conn event timer */ 492 struct work_struct processor; /* connection event processor */ 493 struct work_struct destructor; /* In-process-context destroyer */ 494 struct rxrpc_bundle *bundle; /* Client connection bundle */ 495 struct rb_node service_node; /* Node in peer->service_conns */ 496 struct list_head proc_link; /* link in procfs list */ 497 struct list_head link; /* link in master connection list */ 498 struct sk_buff_head rx_queue; /* received conn-level packets */ 499 500 struct mutex security_lock; /* Lock for security management */ 501 const struct rxrpc_security *security; /* applied security module */ 502 union { 503 struct { 504 struct crypto_sync_skcipher *cipher; /* encryption handle */ 505 struct rxrpc_crypt csum_iv; /* packet checksum base */ 506 u32 nonce; /* response re-use preventer */ 507 } rxkad; 508 }; 509 unsigned long flags; 510 unsigned long events; 511 unsigned long idle_timestamp; /* Time at which last became idle */ 512 spinlock_t state_lock; /* state-change lock */ 513 enum rxrpc_conn_proto_state state; /* current state of connection */ 514 enum rxrpc_call_completion completion; /* Completion condition */ 515 s32 abort_code; /* Abort code of connection abort */ 516 int debug_id; /* debug ID for printks */ 517 rxrpc_serial_t tx_serial; /* Outgoing packet serial number counter */ 518 unsigned int hi_serial; /* highest serial number received */ 519 u32 service_id; /* Service ID, possibly upgraded */ 520 u32 security_level; /* Security level selected */ 521 u8 security_ix; /* security type */ 522 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */ 523 u8 bundle_shift; /* Index into bundle->avail_chans */ 524 bool exclusive; /* T if conn is exclusive */ 525 bool upgrade; /* T if service ID can be upgraded */ 526 u16 orig_service_id; /* Originally requested service ID */ 527 short error; /* Local error code */ 528 }; 529 530 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp) 531 { 532 return sp->hdr.flags & RXRPC_CLIENT_INITIATED; 533 } 534 535 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp) 536 { 537 return !rxrpc_to_server(sp); 538 } 539 540 /* 541 * Flags in call->flags. 542 */ 543 enum rxrpc_call_flag { 544 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */ 545 RXRPC_CALL_HAS_USERID, /* has a user ID attached */ 546 RXRPC_CALL_IS_SERVICE, /* Call is service call */ 547 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */ 548 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */ 549 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */ 550 RXRPC_CALL_TX_ALL_ACKED, /* Last packet has been hard-acked */ 551 RXRPC_CALL_SEND_PING, /* A ping will need to be sent */ 552 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */ 553 RXRPC_CALL_BEGAN_RX_TIMER, /* We began the expect_rx_by timer */ 554 RXRPC_CALL_RX_HEARD, /* The peer responded at least once to this call */ 555 RXRPC_CALL_DISCONNECTED, /* The call has been disconnected */ 556 RXRPC_CALL_KERNEL, /* The call was made by the kernel */ 557 RXRPC_CALL_UPGRADE, /* Service upgrade was requested for the call */ 558 RXRPC_CALL_EXCLUSIVE, /* The call uses a once-only connection */ 559 RXRPC_CALL_RX_IS_IDLE, /* recvmsg() is idle - send an ACK */ 560 RXRPC_CALL_RECVMSG_READ_ALL, /* recvmsg() read all of the received data */ 561 }; 562 563 /* 564 * Events that can be raised on a call. 565 */ 566 enum rxrpc_call_event { 567 RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */ 568 RXRPC_CALL_EV_INITIAL_PING, /* Send initial ping for a new service call */ 569 }; 570 571 /* 572 * The states that a call can be in. 573 */ 574 enum rxrpc_call_state { 575 RXRPC_CALL_UNINITIALISED, 576 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */ 577 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */ 578 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */ 579 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */ 580 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */ 581 RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */ 582 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */ 583 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */ 584 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */ 585 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */ 586 RXRPC_CALL_COMPLETE, /* - call complete */ 587 NR__RXRPC_CALL_STATES 588 }; 589 590 /* 591 * Call Tx congestion management modes. 592 */ 593 enum rxrpc_congest_mode { 594 RXRPC_CALL_SLOW_START, 595 RXRPC_CALL_CONGEST_AVOIDANCE, 596 RXRPC_CALL_PACKET_LOSS, 597 RXRPC_CALL_FAST_RETRANSMIT, 598 NR__RXRPC_CONGEST_MODES 599 }; 600 601 /* 602 * RxRPC call definition 603 * - matched by { connection, call_id } 604 */ 605 struct rxrpc_call { 606 struct rcu_head rcu; 607 struct rxrpc_connection *conn; /* connection carrying call */ 608 struct rxrpc_bundle *bundle; /* Connection bundle to use */ 609 struct rxrpc_peer *peer; /* Peer record for remote address */ 610 struct rxrpc_local *local; /* Representation of local endpoint */ 611 struct rxrpc_sock __rcu *socket; /* socket responsible */ 612 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ 613 struct key *key; /* Security details */ 614 const struct rxrpc_security *security; /* applied security module */ 615 struct mutex user_mutex; /* User access mutex */ 616 struct sockaddr_rxrpc dest_srx; /* Destination address */ 617 unsigned long delay_ack_at; /* When DELAY ACK needs to happen */ 618 unsigned long ack_lost_at; /* When ACK is figured as lost */ 619 unsigned long resend_at; /* When next resend needs to happen */ 620 unsigned long ping_at; /* When next to send a ping */ 621 unsigned long keepalive_at; /* When next to send a keepalive ping */ 622 unsigned long expect_rx_by; /* When we expect to get a packet by */ 623 unsigned long expect_req_by; /* When we expect to get a request DATA packet by */ 624 unsigned long expect_term_by; /* When we expect call termination by */ 625 u32 next_rx_timo; /* Timeout for next Rx packet (jif) */ 626 u32 next_req_timo; /* Timeout for next Rx request packet (jif) */ 627 u32 hard_timo; /* Maximum lifetime or 0 (jif) */ 628 struct timer_list timer; /* Combined event timer */ 629 struct work_struct destroyer; /* In-process-context destroyer */ 630 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */ 631 struct list_head link; /* link in master call list */ 632 struct list_head wait_link; /* Link in local->new_client_calls */ 633 struct hlist_node error_link; /* link in error distribution list */ 634 struct list_head accept_link; /* Link in rx->acceptq */ 635 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */ 636 struct list_head sock_link; /* Link in rx->sock_calls */ 637 struct rb_node sock_node; /* Node in rx->calls */ 638 struct list_head attend_link; /* Link in local->call_attend_q */ 639 struct rxrpc_txbuf *tx_pending; /* Tx buffer being filled */ 640 wait_queue_head_t waitq; /* Wait queue for channel or Tx */ 641 s64 tx_total_len; /* Total length left to be transmitted (or -1) */ 642 unsigned long user_call_ID; /* user-defined call ID */ 643 unsigned long flags; 644 unsigned long events; 645 spinlock_t notify_lock; /* Kernel notification lock */ 646 unsigned int send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */ 647 s32 send_abort; /* Abort code to be sent */ 648 short send_abort_err; /* Error to be associated with the abort */ 649 rxrpc_seq_t send_abort_seq; /* DATA packet that incurred the abort (or 0) */ 650 s32 abort_code; /* Local/remote abort code */ 651 int error; /* Local error incurred */ 652 enum rxrpc_call_state _state; /* Current state of call (needs barrier) */ 653 enum rxrpc_call_completion completion; /* Call completion condition */ 654 refcount_t ref; 655 u8 security_ix; /* Security type */ 656 enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */ 657 u32 call_id; /* call ID on connection */ 658 u32 cid; /* connection ID plus channel index */ 659 u32 security_level; /* Security level selected */ 660 int debug_id; /* debug ID for printks */ 661 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */ 662 unsigned short rx_pkt_len; /* Current recvmsg packet len */ 663 664 /* Transmitted data tracking. */ 665 spinlock_t tx_lock; /* Transmit queue lock */ 666 struct list_head tx_sendmsg; /* Sendmsg prepared packets */ 667 struct list_head tx_buffer; /* Buffer of transmissible packets */ 668 rxrpc_seq_t tx_bottom; /* First packet in buffer */ 669 rxrpc_seq_t tx_transmitted; /* Highest packet transmitted */ 670 rxrpc_seq_t tx_prepared; /* Highest Tx slot prepared. */ 671 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */ 672 u16 tx_backoff; /* Delay to insert due to Tx failure */ 673 u8 tx_winsize; /* Maximum size of Tx window */ 674 #define RXRPC_TX_MAX_WINDOW 128 675 ktime_t tx_last_sent; /* Last time a transmission occurred */ 676 677 /* Received data tracking */ 678 struct sk_buff_head recvmsg_queue; /* Queue of packets ready for recvmsg() */ 679 struct sk_buff_head rx_oos_queue; /* Queue of out of sequence packets */ 680 681 rxrpc_seq_t rx_highest_seq; /* Higest sequence number received */ 682 rxrpc_seq_t rx_consumed; /* Highest packet consumed */ 683 rxrpc_serial_t rx_serial; /* Highest serial received for this call */ 684 u8 rx_winsize; /* Size of Rx window */ 685 686 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS 687 * is fixed, we keep these numbers in terms of segments (ie. DATA 688 * packets) rather than bytes. 689 */ 690 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN 691 #define RXRPC_MIN_CWND 4 692 u8 cong_cwnd; /* Congestion window size */ 693 u8 cong_extra; /* Extra to send for congestion management */ 694 u8 cong_ssthresh; /* Slow-start threshold */ 695 enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */ 696 u8 cong_dup_acks; /* Count of ACKs showing missing packets */ 697 u8 cong_cumul_acks; /* Cumulative ACK count */ 698 ktime_t cong_tstamp; /* Last time cwnd was changed */ 699 struct sk_buff *cong_last_nack; /* Last ACK with nacks received */ 700 701 /* Receive-phase ACK management (ACKs we send). */ 702 u8 ackr_reason; /* reason to ACK */ 703 u16 ackr_sack_base; /* Starting slot in SACK table ring */ 704 rxrpc_seq_t ackr_window; /* Base of SACK window */ 705 rxrpc_seq_t ackr_wtop; /* Base of SACK window */ 706 unsigned int ackr_nr_unacked; /* Number of unacked packets */ 707 atomic_t ackr_nr_consumed; /* Number of packets needing hard ACK */ 708 struct { 709 #define RXRPC_SACK_SIZE 256 710 /* SACK table for soft-acked packets */ 711 u8 ackr_sack_table[RXRPC_SACK_SIZE]; 712 } __aligned(8); 713 714 /* RTT management */ 715 rxrpc_serial_t rtt_serial[4]; /* Serial number of DATA or PING sent */ 716 ktime_t rtt_sent_at[4]; /* Time packet sent */ 717 unsigned long rtt_avail; /* Mask of available slots in bits 0-3, 718 * Mask of pending samples in 8-11 */ 719 #define RXRPC_CALL_RTT_AVAIL_MASK 0xf 720 #define RXRPC_CALL_RTT_PEND_SHIFT 8 721 722 /* Transmission-phase ACK management (ACKs we've received). */ 723 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */ 724 rxrpc_seq_t acks_first_seq; /* first sequence number received */ 725 rxrpc_seq_t acks_prev_seq; /* Highest previousPacket received */ 726 rxrpc_seq_t acks_hard_ack; /* Latest hard-ack point */ 727 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */ 728 rxrpc_serial_t acks_highest_serial; /* Highest serial number ACK'd */ 729 }; 730 731 /* 732 * Summary of a new ACK and the changes it made to the Tx buffer packet states. 733 */ 734 struct rxrpc_ack_summary { 735 u16 nr_acks; /* Number of ACKs in packet */ 736 u16 nr_new_acks; /* Number of new ACKs in packet */ 737 u16 nr_new_nacks; /* Number of new nacks in packet */ 738 u16 nr_retained_nacks; /* Number of nacks retained between ACKs */ 739 u8 ack_reason; 740 bool saw_nacks; /* Saw NACKs in packet */ 741 bool new_low_nack; /* T if new low NACK found */ 742 bool retrans_timeo; /* T if reTx due to timeout happened */ 743 u8 flight_size; /* Number of unreceived transmissions */ 744 /* Place to stash values for tracing */ 745 enum rxrpc_congest_mode mode:8; 746 u8 cwnd; 747 u8 ssthresh; 748 u8 dup_acks; 749 u8 cumulative_acks; 750 }; 751 752 /* 753 * sendmsg() cmsg-specified parameters. 754 */ 755 enum rxrpc_command { 756 RXRPC_CMD_SEND_DATA, /* send data message */ 757 RXRPC_CMD_SEND_ABORT, /* request abort generation */ 758 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */ 759 RXRPC_CMD_CHARGE_ACCEPT, /* [server] charge accept preallocation */ 760 }; 761 762 struct rxrpc_call_params { 763 s64 tx_total_len; /* Total Tx data length (if send data) */ 764 unsigned long user_call_ID; /* User's call ID */ 765 struct { 766 u32 hard; /* Maximum lifetime (sec) */ 767 u32 idle; /* Max time since last data packet (msec) */ 768 u32 normal; /* Max time since last call packet (msec) */ 769 } timeouts; 770 u8 nr_timeouts; /* Number of timeouts specified */ 771 bool kernel; /* T if kernel is making the call */ 772 enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */ 773 }; 774 775 struct rxrpc_send_params { 776 struct rxrpc_call_params call; 777 u32 abort_code; /* Abort code to Tx (if abort) */ 778 enum rxrpc_command command : 8; /* The command to implement */ 779 bool exclusive; /* Shared or exclusive call */ 780 bool upgrade; /* If the connection is upgradeable */ 781 }; 782 783 /* 784 * Buffer of data to be output as a packet. 785 */ 786 struct rxrpc_txbuf { 787 struct rcu_head rcu; 788 struct list_head call_link; /* Link in call->tx_sendmsg/tx_buffer */ 789 struct list_head tx_link; /* Link in live Enc queue or Tx queue */ 790 ktime_t last_sent; /* Time at which last transmitted */ 791 refcount_t ref; 792 rxrpc_seq_t seq; /* Sequence number of this packet */ 793 unsigned int call_debug_id; 794 unsigned int debug_id; 795 unsigned int len; /* Amount of data in buffer */ 796 unsigned int space; /* Remaining data space */ 797 unsigned int offset; /* Offset of fill point */ 798 unsigned long flags; 799 #define RXRPC_TXBUF_LAST 0 /* Set if last packet in Tx phase */ 800 #define RXRPC_TXBUF_RESENT 1 /* Set if has been resent */ 801 u8 /*enum rxrpc_propose_ack_trace*/ ack_why; /* If ack, why */ 802 struct { 803 /* The packet for encrypting and DMA'ing. We align it such 804 * that data[] aligns correctly for any crypto blocksize. 805 */ 806 u8 pad[64 - sizeof(struct rxrpc_wire_header)]; 807 struct rxrpc_wire_header wire; /* Network-ready header */ 808 union { 809 u8 data[RXRPC_JUMBO_DATALEN]; /* Data packet */ 810 struct { 811 struct rxrpc_ackpacket ack; 812 DECLARE_FLEX_ARRAY(u8, acks); 813 }; 814 }; 815 } __aligned(64); 816 }; 817 818 static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb) 819 { 820 return txb->wire.flags & RXRPC_CLIENT_INITIATED; 821 } 822 823 static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb) 824 { 825 return !rxrpc_sending_to_server(txb); 826 } 827 828 #include <trace/events/rxrpc.h> 829 830 /* 831 * Allocate the next serial number on a connection. 0 must be skipped. 832 */ 833 static inline rxrpc_serial_t rxrpc_get_next_serial(struct rxrpc_connection *conn) 834 { 835 rxrpc_serial_t serial; 836 837 serial = conn->tx_serial; 838 if (serial == 0) 839 serial = 1; 840 conn->tx_serial = serial + 1; 841 return serial; 842 } 843 844 /* 845 * af_rxrpc.c 846 */ 847 extern atomic_t rxrpc_n_rx_skbs; 848 extern struct workqueue_struct *rxrpc_workqueue; 849 850 /* 851 * call_accept.c 852 */ 853 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t); 854 void rxrpc_discard_prealloc(struct rxrpc_sock *); 855 bool rxrpc_new_incoming_call(struct rxrpc_local *local, 856 struct rxrpc_peer *peer, 857 struct rxrpc_connection *conn, 858 struct sockaddr_rxrpc *peer_srx, 859 struct sk_buff *skb); 860 void rxrpc_accept_incoming_calls(struct rxrpc_local *); 861 int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long); 862 863 /* 864 * call_event.c 865 */ 866 void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial, 867 enum rxrpc_propose_ack_trace why); 868 void rxrpc_send_ACK(struct rxrpc_call *, u8, rxrpc_serial_t, enum rxrpc_propose_ack_trace); 869 void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t, 870 enum rxrpc_propose_ack_trace); 871 void rxrpc_shrink_call_tx_buffer(struct rxrpc_call *); 872 void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb); 873 874 void rxrpc_reduce_call_timer(struct rxrpc_call *call, 875 unsigned long expire_at, 876 unsigned long now, 877 enum rxrpc_timer_trace why); 878 879 bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb); 880 881 /* 882 * call_object.c 883 */ 884 extern const char *const rxrpc_call_states[]; 885 extern const char *const rxrpc_call_completions[]; 886 extern struct kmem_cache *rxrpc_call_jar; 887 888 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what); 889 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long); 890 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int); 891 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *, 892 struct rxrpc_conn_parameters *, 893 struct sockaddr_rxrpc *, 894 struct rxrpc_call_params *, gfp_t, 895 unsigned int); 896 void rxrpc_start_call_timer(struct rxrpc_call *call); 897 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *, 898 struct sk_buff *); 899 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *); 900 void rxrpc_release_calls_on_socket(struct rxrpc_sock *); 901 void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace); 902 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 903 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 904 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace); 905 void rxrpc_cleanup_call(struct rxrpc_call *); 906 void rxrpc_destroy_all_calls(struct rxrpc_net *); 907 908 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call) 909 { 910 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags); 911 } 912 913 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call) 914 { 915 return !rxrpc_is_service_call(call); 916 } 917 918 /* 919 * call_state.c 920 */ 921 bool rxrpc_set_call_completion(struct rxrpc_call *call, 922 enum rxrpc_call_completion compl, 923 u32 abort_code, 924 int error); 925 bool rxrpc_call_completed(struct rxrpc_call *call); 926 bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq, 927 u32 abort_code, int error, enum rxrpc_abort_reason why); 928 void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl, 929 int error); 930 931 static inline void rxrpc_set_call_state(struct rxrpc_call *call, 932 enum rxrpc_call_state state) 933 { 934 /* Order write of completion info before write of ->state. */ 935 smp_store_release(&call->_state, state); 936 wake_up(&call->waitq); 937 } 938 939 static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call) 940 { 941 return call->_state; /* Only inside I/O thread */ 942 } 943 944 static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call) 945 { 946 return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; 947 } 948 949 static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call) 950 { 951 /* Order read ->state before read of completion info. */ 952 return smp_load_acquire(&call->_state); 953 } 954 955 static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call) 956 { 957 return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; 958 } 959 960 static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call) 961 { 962 return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED; 963 } 964 965 /* 966 * conn_client.c 967 */ 968 extern unsigned int rxrpc_reap_client_connections; 969 extern unsigned long rxrpc_conn_idle_client_expiry; 970 extern unsigned long rxrpc_conn_idle_client_fast_expiry; 971 972 void rxrpc_purge_client_connections(struct rxrpc_local *local); 973 struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 974 void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 975 int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp); 976 void rxrpc_connect_client_calls(struct rxrpc_local *local); 977 void rxrpc_expose_client_call(struct rxrpc_call *); 978 void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *); 979 void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle); 980 void rxrpc_put_client_conn(struct rxrpc_connection *, enum rxrpc_conn_trace); 981 void rxrpc_discard_expired_client_conns(struct rxrpc_local *local); 982 void rxrpc_clean_up_local_conns(struct rxrpc_local *); 983 984 /* 985 * conn_event.c 986 */ 987 void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb, 988 unsigned int channel); 989 int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb, 990 s32 abort_code, int err, enum rxrpc_abort_reason why); 991 void rxrpc_process_connection(struct work_struct *); 992 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool); 993 bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb); 994 void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb); 995 996 static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn) 997 { 998 /* Order reading the abort info after the state check. */ 999 return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED; 1000 } 1001 1002 /* 1003 * conn_object.c 1004 */ 1005 extern unsigned int rxrpc_connection_expiry; 1006 extern unsigned int rxrpc_closed_conn_expiry; 1007 1008 void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why); 1009 struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t); 1010 struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *, 1011 struct sockaddr_rxrpc *, 1012 struct sk_buff *); 1013 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *); 1014 void rxrpc_disconnect_call(struct rxrpc_call *); 1015 void rxrpc_kill_client_conn(struct rxrpc_connection *); 1016 void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace); 1017 void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 1018 struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *, 1019 enum rxrpc_conn_trace); 1020 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *, 1021 enum rxrpc_conn_trace); 1022 void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 1023 void rxrpc_service_connection_reaper(struct work_struct *); 1024 void rxrpc_destroy_all_connections(struct rxrpc_net *); 1025 1026 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn) 1027 { 1028 return conn->out_clientflag; 1029 } 1030 1031 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn) 1032 { 1033 return !rxrpc_conn_is_client(conn); 1034 } 1035 1036 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn, 1037 unsigned long expire_at) 1038 { 1039 timer_reduce(&conn->timer, expire_at); 1040 } 1041 1042 /* 1043 * conn_service.c 1044 */ 1045 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *, 1046 struct sk_buff *); 1047 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t); 1048 void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *, 1049 const struct rxrpc_security *, struct sk_buff *); 1050 void rxrpc_unpublish_service_conn(struct rxrpc_connection *); 1051 1052 /* 1053 * input.c 1054 */ 1055 void rxrpc_congestion_degrade(struct rxrpc_call *); 1056 void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *); 1057 void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *); 1058 1059 /* 1060 * io_thread.c 1061 */ 1062 int rxrpc_encap_rcv(struct sock *, struct sk_buff *); 1063 void rxrpc_error_report(struct sock *); 1064 bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why, 1065 s32 abort_code, int err); 1066 int rxrpc_io_thread(void *data); 1067 static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local) 1068 { 1069 wake_up_process(local->io_thread); 1070 } 1071 1072 static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why) 1073 { 1074 return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO); 1075 } 1076 1077 /* 1078 * insecure.c 1079 */ 1080 extern const struct rxrpc_security rxrpc_no_security; 1081 1082 /* 1083 * key.c 1084 */ 1085 extern struct key_type key_type_rxrpc; 1086 1087 int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int); 1088 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t, 1089 u32); 1090 1091 /* 1092 * local_event.c 1093 */ 1094 void rxrpc_gen_version_string(void); 1095 void rxrpc_send_version_request(struct rxrpc_local *local, 1096 struct rxrpc_host_header *hdr, 1097 struct sk_buff *skb); 1098 1099 /* 1100 * local_object.c 1101 */ 1102 void rxrpc_local_dont_fragment(const struct rxrpc_local *local, bool set); 1103 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *); 1104 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace); 1105 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace); 1106 void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace); 1107 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace); 1108 void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace); 1109 void rxrpc_destroy_local(struct rxrpc_local *local); 1110 void rxrpc_destroy_all_locals(struct rxrpc_net *); 1111 1112 static inline bool __rxrpc_use_local(struct rxrpc_local *local, 1113 enum rxrpc_local_trace why) 1114 { 1115 int r, u; 1116 1117 r = refcount_read(&local->ref); 1118 u = atomic_fetch_add_unless(&local->active_users, 1, 0); 1119 trace_rxrpc_local(local->debug_id, why, r, u); 1120 return u != 0; 1121 } 1122 1123 static inline void rxrpc_see_local(struct rxrpc_local *local, 1124 enum rxrpc_local_trace why) 1125 { 1126 int r, u; 1127 1128 r = refcount_read(&local->ref); 1129 u = atomic_read(&local->active_users); 1130 trace_rxrpc_local(local->debug_id, why, r, u); 1131 } 1132 1133 /* 1134 * misc.c 1135 */ 1136 extern unsigned int rxrpc_max_backlog __read_mostly; 1137 extern unsigned long rxrpc_soft_ack_delay; 1138 extern unsigned long rxrpc_idle_ack_delay; 1139 extern unsigned int rxrpc_rx_window_size; 1140 extern unsigned int rxrpc_rx_mtu; 1141 extern unsigned int rxrpc_rx_jumbo_max; 1142 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY 1143 extern unsigned long rxrpc_inject_rx_delay; 1144 #endif 1145 1146 /* 1147 * net_ns.c 1148 */ 1149 extern unsigned int rxrpc_net_id; 1150 extern struct pernet_operations rxrpc_net_ops; 1151 1152 static inline struct rxrpc_net *rxrpc_net(struct net *net) 1153 { 1154 return net_generic(net, rxrpc_net_id); 1155 } 1156 1157 /* 1158 * output.c 1159 */ 1160 int rxrpc_send_ack_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb); 1161 int rxrpc_send_abort_packet(struct rxrpc_call *); 1162 int rxrpc_send_data_packet(struct rxrpc_call *, struct rxrpc_txbuf *); 1163 void rxrpc_send_conn_abort(struct rxrpc_connection *conn); 1164 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb); 1165 void rxrpc_send_keepalive(struct rxrpc_peer *); 1166 void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb); 1167 1168 /* 1169 * peer_event.c 1170 */ 1171 void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *); 1172 void rxrpc_peer_keepalive_worker(struct work_struct *); 1173 1174 /* 1175 * peer_object.c 1176 */ 1177 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *, 1178 const struct sockaddr_rxrpc *); 1179 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local, 1180 struct sockaddr_rxrpc *srx, gfp_t gfp); 1181 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t, 1182 enum rxrpc_peer_trace); 1183 void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer); 1184 void rxrpc_destroy_all_peers(struct rxrpc_net *); 1185 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1186 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace); 1187 void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1188 1189 /* 1190 * proc.c 1191 */ 1192 extern const struct seq_operations rxrpc_call_seq_ops; 1193 extern const struct seq_operations rxrpc_connection_seq_ops; 1194 extern const struct seq_operations rxrpc_peer_seq_ops; 1195 extern const struct seq_operations rxrpc_local_seq_ops; 1196 1197 /* 1198 * recvmsg.c 1199 */ 1200 void rxrpc_notify_socket(struct rxrpc_call *); 1201 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int); 1202 1203 /* 1204 * Abort a call due to a protocol error. 1205 */ 1206 static inline int rxrpc_abort_eproto(struct rxrpc_call *call, 1207 struct sk_buff *skb, 1208 s32 abort_code, 1209 enum rxrpc_abort_reason why) 1210 { 1211 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 1212 1213 rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why); 1214 return -EPROTO; 1215 } 1216 1217 /* 1218 * rtt.c 1219 */ 1220 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, int, 1221 rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t); 1222 unsigned long rxrpc_get_rto_backoff(struct rxrpc_peer *, bool); 1223 void rxrpc_peer_init_rtt(struct rxrpc_peer *); 1224 1225 /* 1226 * rxkad.c 1227 */ 1228 #ifdef CONFIG_RXKAD 1229 extern const struct rxrpc_security rxkad; 1230 #endif 1231 1232 /* 1233 * security.c 1234 */ 1235 int __init rxrpc_init_security(void); 1236 const struct rxrpc_security *rxrpc_security_lookup(u8); 1237 void rxrpc_exit_security(void); 1238 int rxrpc_init_client_call_security(struct rxrpc_call *); 1239 int rxrpc_init_client_conn_security(struct rxrpc_connection *); 1240 const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *, 1241 struct sk_buff *); 1242 struct key *rxrpc_look_up_server_security(struct rxrpc_connection *, 1243 struct sk_buff *, u32, u32); 1244 1245 /* 1246 * sendmsg.c 1247 */ 1248 bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error, 1249 enum rxrpc_abort_reason why); 1250 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t); 1251 1252 /* 1253 * server_key.c 1254 */ 1255 extern struct key_type key_type_rxrpc_s; 1256 1257 int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int); 1258 1259 /* 1260 * skbuff.c 1261 */ 1262 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *); 1263 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace); 1264 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace); 1265 void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace); 1266 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace); 1267 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace); 1268 void rxrpc_purge_queue(struct sk_buff_head *); 1269 1270 /* 1271 * stats.c 1272 */ 1273 int rxrpc_stats_show(struct seq_file *seq, void *v); 1274 int rxrpc_stats_clear(struct file *file, char *buf, size_t size); 1275 1276 #define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s) 1277 #define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s) 1278 1279 /* 1280 * sysctl.c 1281 */ 1282 #ifdef CONFIG_SYSCTL 1283 extern int __init rxrpc_sysctl_init(void); 1284 extern void rxrpc_sysctl_exit(void); 1285 #else 1286 static inline int __init rxrpc_sysctl_init(void) { return 0; } 1287 static inline void rxrpc_sysctl_exit(void) {} 1288 #endif 1289 1290 /* 1291 * txbuf.c 1292 */ 1293 extern atomic_t rxrpc_nr_txbuf; 1294 struct rxrpc_txbuf *rxrpc_alloc_txbuf(struct rxrpc_call *call, u8 packet_type, 1295 gfp_t gfp); 1296 void rxrpc_get_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1297 void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1298 void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1299 1300 /* 1301 * utils.c 1302 */ 1303 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *); 1304 1305 static inline bool before(u32 seq1, u32 seq2) 1306 { 1307 return (s32)(seq1 - seq2) < 0; 1308 } 1309 static inline bool before_eq(u32 seq1, u32 seq2) 1310 { 1311 return (s32)(seq1 - seq2) <= 0; 1312 } 1313 static inline bool after(u32 seq1, u32 seq2) 1314 { 1315 return (s32)(seq1 - seq2) > 0; 1316 } 1317 static inline bool after_eq(u32 seq1, u32 seq2) 1318 { 1319 return (s32)(seq1 - seq2) >= 0; 1320 } 1321 1322 /* 1323 * debug tracing 1324 */ 1325 extern unsigned int rxrpc_debug; 1326 1327 #define dbgprintk(FMT,...) \ 1328 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1329 1330 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1331 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1332 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1333 1334 1335 #if defined(__KDEBUG) 1336 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1337 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1338 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1339 1340 #elif defined(CONFIG_AF_RXRPC_DEBUG) 1341 #define RXRPC_DEBUG_KENTER 0x01 1342 #define RXRPC_DEBUG_KLEAVE 0x02 1343 #define RXRPC_DEBUG_KDEBUG 0x04 1344 1345 #define _enter(FMT,...) \ 1346 do { \ 1347 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \ 1348 kenter(FMT,##__VA_ARGS__); \ 1349 } while (0) 1350 1351 #define _leave(FMT,...) \ 1352 do { \ 1353 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \ 1354 kleave(FMT,##__VA_ARGS__); \ 1355 } while (0) 1356 1357 #define _debug(FMT,...) \ 1358 do { \ 1359 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \ 1360 kdebug(FMT,##__VA_ARGS__); \ 1361 } while (0) 1362 1363 #else 1364 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1365 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1366 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1367 #endif 1368 1369 /* 1370 * debug assertion checking 1371 */ 1372 #if 1 // defined(__KDEBUGALL) 1373 1374 #define ASSERT(X) \ 1375 do { \ 1376 if (unlikely(!(X))) { \ 1377 pr_err("Assertion failed\n"); \ 1378 BUG(); \ 1379 } \ 1380 } while (0) 1381 1382 #define ASSERTCMP(X, OP, Y) \ 1383 do { \ 1384 __typeof__(X) _x = (X); \ 1385 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1386 if (unlikely(!(_x OP _y))) { \ 1387 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1388 (unsigned long)_x, (unsigned long)_x, #OP, \ 1389 (unsigned long)_y, (unsigned long)_y); \ 1390 BUG(); \ 1391 } \ 1392 } while (0) 1393 1394 #define ASSERTIF(C, X) \ 1395 do { \ 1396 if (unlikely((C) && !(X))) { \ 1397 pr_err("Assertion failed\n"); \ 1398 BUG(); \ 1399 } \ 1400 } while (0) 1401 1402 #define ASSERTIFCMP(C, X, OP, Y) \ 1403 do { \ 1404 __typeof__(X) _x = (X); \ 1405 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1406 if (unlikely((C) && !(_x OP _y))) { \ 1407 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1408 (unsigned long)_x, (unsigned long)_x, #OP, \ 1409 (unsigned long)_y, (unsigned long)_y); \ 1410 BUG(); \ 1411 } \ 1412 } while (0) 1413 1414 #else 1415 1416 #define ASSERT(X) \ 1417 do { \ 1418 } while (0) 1419 1420 #define ASSERTCMP(X, OP, Y) \ 1421 do { \ 1422 } while (0) 1423 1424 #define ASSERTIF(C, X) \ 1425 do { \ 1426 } while (0) 1427 1428 #define ASSERTIFCMP(C, X, OP, Y) \ 1429 do { \ 1430 } while (0) 1431 1432 #endif /* __KDEBUGALL */ 1433