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 bundle_proc_list; /* List of bundles for proc */ 72 struct list_head conn_proc_list; /* List of conns in this namespace for proc */ 73 struct list_head service_conns; /* Service conns in this namespace */ 74 rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */ 75 struct work_struct service_conn_reaper; 76 struct timer_list service_conn_reap_timer; 77 78 bool live; 79 80 atomic_t nr_client_conns; 81 82 struct hlist_head local_endpoints; 83 struct mutex local_mutex; /* Lock for ->local_endpoints */ 84 85 DECLARE_HASHTABLE (peer_hash, 10); 86 spinlock_t peer_hash_lock; /* Lock for ->peer_hash */ 87 88 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */ 89 u8 peer_keepalive_cursor; 90 time64_t peer_keepalive_base; 91 struct list_head peer_keepalive[32]; 92 struct list_head peer_keepalive_new; 93 struct timer_list peer_keepalive_timer; 94 struct work_struct peer_keepalive_work; 95 96 atomic_t stat_tx_data; 97 atomic_t stat_tx_data_retrans; 98 atomic_t stat_tx_data_send; 99 atomic_t stat_tx_data_send_frag; 100 atomic_t stat_tx_data_send_fail; 101 atomic_t stat_tx_data_underflow; 102 atomic_t stat_tx_data_cwnd_reset; 103 atomic_t stat_rx_data; 104 atomic_t stat_rx_data_reqack; 105 atomic_t stat_rx_data_jumbo; 106 107 atomic_t stat_tx_ack_fill; 108 atomic_t stat_tx_ack_send; 109 atomic_t stat_tx_ack_skip; 110 atomic_t stat_tx_acks[256]; 111 atomic_t stat_rx_acks[256]; 112 113 atomic_t stat_why_req_ack[8]; 114 115 atomic_t stat_io_loop; 116 }; 117 118 /* 119 * Service backlog preallocation. 120 * 121 * This contains circular buffers of preallocated peers, connections and calls 122 * for incoming service calls and their head and tail pointers. This allows 123 * calls to be set up in the data_ready handler, thereby avoiding the need to 124 * shuffle packets around so much. 125 */ 126 struct rxrpc_backlog { 127 unsigned short peer_backlog_head; 128 unsigned short peer_backlog_tail; 129 unsigned short conn_backlog_head; 130 unsigned short conn_backlog_tail; 131 unsigned short call_backlog_head; 132 unsigned short call_backlog_tail; 133 #define RXRPC_BACKLOG_MAX 32 134 struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX]; 135 struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX]; 136 struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX]; 137 }; 138 139 /* 140 * RxRPC socket definition 141 */ 142 struct rxrpc_sock { 143 /* WARNING: sk has to be the first member */ 144 struct sock sk; 145 rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */ 146 rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */ 147 struct rxrpc_local *local; /* local endpoint */ 148 struct rxrpc_backlog *backlog; /* Preallocation for services */ 149 spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */ 150 struct list_head sock_calls; /* List of calls owned by this socket */ 151 struct list_head to_be_accepted; /* calls awaiting acceptance */ 152 struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */ 153 spinlock_t recvmsg_lock; /* Lock for recvmsg_q */ 154 struct key *key; /* security for this socket */ 155 struct key *securities; /* list of server security descriptors */ 156 struct rb_root calls; /* User ID -> call mapping */ 157 unsigned long flags; 158 #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */ 159 rwlock_t call_lock; /* lock for calls */ 160 u32 min_sec_level; /* minimum security level */ 161 #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT 162 bool exclusive; /* Exclusive connection for a client socket */ 163 u16 second_service; /* Additional service bound to the endpoint */ 164 struct { 165 /* Service upgrade information */ 166 u16 from; /* Service ID to upgrade (if not 0) */ 167 u16 to; /* service ID to upgrade to */ 168 } service_upgrade; 169 sa_family_t family; /* Protocol family created with */ 170 struct sockaddr_rxrpc srx; /* Primary Service/local addresses */ 171 struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */ 172 }; 173 174 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk) 175 176 /* 177 * CPU-byteorder normalised Rx packet header. 178 */ 179 struct rxrpc_host_header { 180 u32 epoch; /* client boot timestamp */ 181 u32 cid; /* connection and channel ID */ 182 u32 callNumber; /* call ID (0 for connection-level packets) */ 183 u32 seq; /* sequence number of pkt in call stream */ 184 u32 serial; /* serial number of pkt sent to network */ 185 u8 type; /* packet type */ 186 u8 flags; /* packet flags */ 187 u8 userStatus; /* app-layer defined status */ 188 u8 securityIndex; /* security protocol ID */ 189 union { 190 u16 _rsvd; /* reserved */ 191 u16 cksum; /* kerberos security checksum */ 192 }; 193 u16 serviceId; /* service ID */ 194 } __packed; 195 196 /* 197 * RxRPC socket buffer private variables 198 * - max 48 bytes (struct sk_buff::cb) 199 */ 200 struct rxrpc_skb_priv { 201 struct rxrpc_connection *conn; /* Connection referred to (poke packet) */ 202 u16 offset; /* Offset of data */ 203 u16 len; /* Length of data */ 204 u8 flags; 205 #define RXRPC_RX_VERIFIED 0x01 206 207 struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */ 208 }; 209 210 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb) 211 212 /* 213 * RxRPC security module interface 214 */ 215 struct rxrpc_security { 216 const char *name; /* name of this service */ 217 u8 security_index; /* security type provided */ 218 u32 no_key_abort; /* Abort code indicating no key */ 219 220 /* Initialise a security service */ 221 int (*init)(void); 222 223 /* Clean up a security service */ 224 void (*exit)(void); 225 226 /* Parse the information from a server key */ 227 int (*preparse_server_key)(struct key_preparsed_payload *); 228 229 /* Clean up the preparse buffer after parsing a server key */ 230 void (*free_preparse_server_key)(struct key_preparsed_payload *); 231 232 /* Destroy the payload of a server key */ 233 void (*destroy_server_key)(struct key *); 234 235 /* Describe a server key */ 236 void (*describe_server_key)(const struct key *, struct seq_file *); 237 238 /* initialise a connection's security */ 239 int (*init_connection_security)(struct rxrpc_connection *, 240 struct rxrpc_key_token *); 241 242 /* Work out how much data we can store in a packet, given an estimate 243 * of the amount of data remaining. 244 */ 245 int (*how_much_data)(struct rxrpc_call *, size_t, 246 size_t *, size_t *, size_t *); 247 248 /* impose security on a packet */ 249 int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *); 250 251 /* verify the security on a received packet */ 252 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *); 253 254 /* Free crypto request on a call */ 255 void (*free_call_crypto)(struct rxrpc_call *); 256 257 /* issue a challenge */ 258 int (*issue_challenge)(struct rxrpc_connection *); 259 260 /* respond to a challenge */ 261 int (*respond_to_challenge)(struct rxrpc_connection *, 262 struct sk_buff *); 263 264 /* verify a response */ 265 int (*verify_response)(struct rxrpc_connection *, 266 struct sk_buff *); 267 268 /* clear connection security */ 269 void (*clear)(struct rxrpc_connection *); 270 }; 271 272 /* 273 * RxRPC local transport endpoint description 274 * - owned by a single AF_RXRPC socket 275 * - pointed to by transport socket struct sk_user_data 276 */ 277 struct rxrpc_local { 278 struct rcu_head rcu; 279 atomic_t active_users; /* Number of users of the local endpoint */ 280 refcount_t ref; /* Number of references to the structure */ 281 struct net *net; /* The network namespace */ 282 struct rxrpc_net *rxnet; /* Our bits in the network namespace */ 283 struct hlist_node link; 284 struct socket *socket; /* my UDP socket */ 285 struct task_struct *io_thread; 286 struct completion io_thread_ready; /* Indication that the I/O thread started */ 287 struct rxrpc_sock *service; /* Service(s) listening on this endpoint */ 288 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY 289 struct sk_buff_head rx_delay_queue; /* Delay injection queue */ 290 #endif 291 struct sk_buff_head rx_queue; /* Received packets */ 292 struct list_head conn_attend_q; /* Conns requiring immediate attention */ 293 struct list_head call_attend_q; /* Calls requiring immediate attention */ 294 295 struct rb_root client_bundles; /* Client connection bundles by socket params */ 296 spinlock_t client_bundles_lock; /* Lock for client_bundles */ 297 bool kill_all_client_conns; 298 struct list_head idle_client_conns; 299 struct timer_list client_conn_reap_timer; 300 unsigned long client_conn_flags; 301 #define RXRPC_CLIENT_CONN_REAP_TIMER 0 /* The client conn reap timer expired */ 302 303 spinlock_t lock; /* access lock */ 304 rwlock_t services_lock; /* lock for services list */ 305 int debug_id; /* debug ID for printks */ 306 bool dead; 307 bool service_closed; /* Service socket closed */ 308 struct idr conn_ids; /* List of connection IDs */ 309 struct list_head new_client_calls; /* Newly created client calls need connection */ 310 spinlock_t client_call_lock; /* Lock for ->new_client_calls */ 311 struct sockaddr_rxrpc srx; /* local address */ 312 }; 313 314 /* 315 * RxRPC remote transport endpoint definition 316 * - matched by local endpoint, remote port, address and protocol type 317 */ 318 struct rxrpc_peer { 319 struct rcu_head rcu; /* This must be first */ 320 refcount_t ref; 321 unsigned long hash_key; 322 struct hlist_node hash_link; 323 struct rxrpc_local *local; 324 struct hlist_head error_targets; /* targets for net error distribution */ 325 struct rb_root service_conns; /* Service connections */ 326 struct list_head keepalive_link; /* Link in net->peer_keepalive[] */ 327 time64_t last_tx_at; /* Last time packet sent here */ 328 seqlock_t service_conn_lock; 329 spinlock_t lock; /* access lock */ 330 unsigned int if_mtu; /* interface MTU for this peer */ 331 unsigned int mtu; /* network MTU for this peer */ 332 unsigned int maxdata; /* data size (MTU - hdrsize) */ 333 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */ 334 int debug_id; /* debug ID for printks */ 335 struct sockaddr_rxrpc srx; /* remote address */ 336 337 /* calculated RTT cache */ 338 #define RXRPC_RTT_CACHE_SIZE 32 339 spinlock_t rtt_input_lock; /* RTT lock for input routine */ 340 ktime_t rtt_last_req; /* Time of last RTT request */ 341 unsigned int rtt_count; /* Number of samples we've got */ 342 343 u32 srtt_us; /* smoothed round trip time << 3 in usecs */ 344 u32 mdev_us; /* medium deviation */ 345 u32 mdev_max_us; /* maximal mdev for the last rtt period */ 346 u32 rttvar_us; /* smoothed mdev_max */ 347 u32 rto_j; /* Retransmission timeout in jiffies */ 348 u8 backoff; /* Backoff timeout */ 349 350 u8 cong_ssthresh; /* Congestion slow-start threshold */ 351 }; 352 353 /* 354 * Keys for matching a connection. 355 */ 356 struct rxrpc_conn_proto { 357 union { 358 struct { 359 u32 epoch; /* epoch of this connection */ 360 u32 cid; /* connection ID */ 361 }; 362 u64 index_key; 363 }; 364 }; 365 366 struct rxrpc_conn_parameters { 367 struct rxrpc_local *local; /* Representation of local endpoint */ 368 struct rxrpc_peer *peer; /* Representation of remote endpoint */ 369 struct key *key; /* Security details */ 370 bool exclusive; /* T if conn is exclusive */ 371 bool upgrade; /* T if service ID can be upgraded */ 372 u16 service_id; /* Service ID for this connection */ 373 u32 security_level; /* Security level selected */ 374 }; 375 376 /* 377 * Call completion condition (state == RXRPC_CALL_COMPLETE). 378 */ 379 enum rxrpc_call_completion { 380 RXRPC_CALL_SUCCEEDED, /* - Normal termination */ 381 RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */ 382 RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */ 383 RXRPC_CALL_LOCAL_ERROR, /* - call failed due to local error */ 384 RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */ 385 NR__RXRPC_CALL_COMPLETIONS 386 }; 387 388 /* 389 * Bits in the connection flags. 390 */ 391 enum rxrpc_conn_flag { 392 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */ 393 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */ 394 RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */ 395 RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */ 396 RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */ 397 RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */ 398 RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */ 399 }; 400 401 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \ 402 (1UL << RXRPC_CONN_FINAL_ACK_1) | \ 403 (1UL << RXRPC_CONN_FINAL_ACK_2) | \ 404 (1UL << RXRPC_CONN_FINAL_ACK_3)) 405 406 /* 407 * Events that can be raised upon a connection. 408 */ 409 enum rxrpc_conn_event { 410 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */ 411 RXRPC_CONN_EV_ABORT_CALLS, /* Abort attached calls */ 412 }; 413 414 /* 415 * The connection protocol state. 416 */ 417 enum rxrpc_conn_proto_state { 418 RXRPC_CONN_UNUSED, /* Connection not yet attempted */ 419 RXRPC_CONN_CLIENT_UNSECURED, /* Client connection needs security init */ 420 RXRPC_CONN_CLIENT, /* Client connection */ 421 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */ 422 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */ 423 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */ 424 RXRPC_CONN_SERVICE, /* Service secured connection */ 425 RXRPC_CONN_ABORTED, /* Conn aborted */ 426 RXRPC_CONN__NR_STATES 427 }; 428 429 /* 430 * RxRPC client connection bundle. 431 */ 432 struct rxrpc_bundle { 433 struct rxrpc_local *local; /* Representation of local endpoint */ 434 struct rxrpc_peer *peer; /* Remote endpoint */ 435 struct key *key; /* Security details */ 436 struct list_head proc_link; /* Link in net->bundle_proc_list */ 437 const struct rxrpc_security *security; /* applied security module */ 438 refcount_t ref; 439 atomic_t active; /* Number of active users */ 440 unsigned int debug_id; 441 u32 security_level; /* Security level selected */ 442 u16 service_id; /* Service ID for this connection */ 443 bool try_upgrade; /* True if the bundle is attempting upgrade */ 444 bool exclusive; /* T if conn is exclusive */ 445 bool upgrade; /* T if service ID can be upgraded */ 446 unsigned short alloc_error; /* Error from last conn allocation */ 447 struct rb_node local_node; /* Node in local->client_conns */ 448 struct list_head waiting_calls; /* Calls waiting for channels */ 449 unsigned long avail_chans; /* Mask of available channels */ 450 unsigned int conn_ids[4]; /* Connection IDs. */ 451 struct rxrpc_connection *conns[4]; /* The connections in the bundle (max 4) */ 452 }; 453 454 /* 455 * RxRPC connection definition 456 * - matched by { local, peer, epoch, conn_id, direction } 457 * - each connection can only handle four simultaneous calls 458 */ 459 struct rxrpc_connection { 460 struct rxrpc_conn_proto proto; 461 struct rxrpc_local *local; /* Representation of local endpoint */ 462 struct rxrpc_peer *peer; /* Remote endpoint */ 463 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ 464 struct key *key; /* Security details */ 465 struct list_head attend_link; /* Link in local->conn_attend_q */ 466 467 refcount_t ref; 468 atomic_t active; /* Active count for service conns */ 469 struct rcu_head rcu; 470 struct list_head cache_link; 471 472 unsigned char act_chans; /* Mask of active channels */ 473 struct rxrpc_channel { 474 unsigned long final_ack_at; /* Time at which to issue final ACK */ 475 struct rxrpc_call *call; /* Active call */ 476 unsigned int call_debug_id; /* call->debug_id */ 477 u32 call_id; /* ID of current call */ 478 u32 call_counter; /* Call ID counter */ 479 u32 last_call; /* ID of last call */ 480 u8 last_type; /* Type of last packet */ 481 union { 482 u32 last_seq; 483 u32 last_abort; 484 }; 485 } channels[RXRPC_MAXCALLS]; 486 487 struct timer_list timer; /* Conn event timer */ 488 struct work_struct processor; /* connection event processor */ 489 struct work_struct destructor; /* In-process-context destroyer */ 490 struct rxrpc_bundle *bundle; /* Client connection bundle */ 491 struct rb_node service_node; /* Node in peer->service_conns */ 492 struct list_head proc_link; /* link in procfs list */ 493 struct list_head link; /* link in master connection list */ 494 struct sk_buff_head rx_queue; /* received conn-level packets */ 495 496 struct mutex security_lock; /* Lock for security management */ 497 const struct rxrpc_security *security; /* applied security module */ 498 union { 499 struct { 500 struct crypto_sync_skcipher *cipher; /* encryption handle */ 501 struct rxrpc_crypt csum_iv; /* packet checksum base */ 502 u32 nonce; /* response re-use preventer */ 503 } rxkad; 504 }; 505 unsigned long flags; 506 unsigned long events; 507 unsigned long idle_timestamp; /* Time at which last became idle */ 508 spinlock_t state_lock; /* state-change lock */ 509 enum rxrpc_conn_proto_state state; /* current state of connection */ 510 enum rxrpc_call_completion completion; /* Completion condition */ 511 s32 abort_code; /* Abort code of connection abort */ 512 int debug_id; /* debug ID for printks */ 513 atomic_t serial; /* packet serial number counter */ 514 unsigned int hi_serial; /* highest serial number received */ 515 u32 service_id; /* Service ID, possibly upgraded */ 516 u32 security_level; /* Security level selected */ 517 u8 security_ix; /* security type */ 518 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */ 519 u8 bundle_shift; /* Index into bundle->avail_chans */ 520 bool exclusive; /* T if conn is exclusive */ 521 bool upgrade; /* T if service ID can be upgraded */ 522 u16 orig_service_id; /* Originally requested service ID */ 523 short error; /* Local error code */ 524 }; 525 526 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp) 527 { 528 return sp->hdr.flags & RXRPC_CLIENT_INITIATED; 529 } 530 531 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp) 532 { 533 return !rxrpc_to_server(sp); 534 } 535 536 /* 537 * Flags in call->flags. 538 */ 539 enum rxrpc_call_flag { 540 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */ 541 RXRPC_CALL_HAS_USERID, /* has a user ID attached */ 542 RXRPC_CALL_IS_SERVICE, /* Call is service call */ 543 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */ 544 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */ 545 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */ 546 RXRPC_CALL_TX_ALL_ACKED, /* Last packet has been hard-acked */ 547 RXRPC_CALL_SEND_PING, /* A ping will need to be sent */ 548 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */ 549 RXRPC_CALL_BEGAN_RX_TIMER, /* We began the expect_rx_by timer */ 550 RXRPC_CALL_RX_HEARD, /* The peer responded at least once to this call */ 551 RXRPC_CALL_DISCONNECTED, /* The call has been disconnected */ 552 RXRPC_CALL_KERNEL, /* The call was made by the kernel */ 553 RXRPC_CALL_UPGRADE, /* Service upgrade was requested for the call */ 554 RXRPC_CALL_EXCLUSIVE, /* The call uses a once-only connection */ 555 RXRPC_CALL_RX_IS_IDLE, /* recvmsg() is idle - send an ACK */ 556 RXRPC_CALL_RECVMSG_READ_ALL, /* recvmsg() read all of the received data */ 557 }; 558 559 /* 560 * Events that can be raised on a call. 561 */ 562 enum rxrpc_call_event { 563 RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */ 564 RXRPC_CALL_EV_INITIAL_PING, /* Send initial ping for a new service call */ 565 }; 566 567 /* 568 * The states that a call can be in. 569 */ 570 enum rxrpc_call_state { 571 RXRPC_CALL_UNINITIALISED, 572 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */ 573 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */ 574 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */ 575 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */ 576 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */ 577 RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */ 578 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */ 579 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */ 580 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */ 581 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */ 582 RXRPC_CALL_COMPLETE, /* - call complete */ 583 NR__RXRPC_CALL_STATES 584 }; 585 586 /* 587 * Call Tx congestion management modes. 588 */ 589 enum rxrpc_congest_mode { 590 RXRPC_CALL_SLOW_START, 591 RXRPC_CALL_CONGEST_AVOIDANCE, 592 RXRPC_CALL_PACKET_LOSS, 593 RXRPC_CALL_FAST_RETRANSMIT, 594 NR__RXRPC_CONGEST_MODES 595 }; 596 597 /* 598 * RxRPC call definition 599 * - matched by { connection, call_id } 600 */ 601 struct rxrpc_call { 602 struct rcu_head rcu; 603 struct rxrpc_connection *conn; /* connection carrying call */ 604 struct rxrpc_bundle *bundle; /* Connection bundle to use */ 605 struct rxrpc_peer *peer; /* Peer record for remote address */ 606 struct rxrpc_local *local; /* Representation of local endpoint */ 607 struct rxrpc_sock __rcu *socket; /* socket responsible */ 608 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ 609 struct key *key; /* Security details */ 610 const struct rxrpc_security *security; /* applied security module */ 611 struct mutex user_mutex; /* User access mutex */ 612 struct sockaddr_rxrpc dest_srx; /* Destination address */ 613 unsigned long delay_ack_at; /* When DELAY ACK needs to happen */ 614 unsigned long ack_lost_at; /* When ACK is figured as lost */ 615 unsigned long resend_at; /* When next resend needs to happen */ 616 unsigned long ping_at; /* When next to send a ping */ 617 unsigned long keepalive_at; /* When next to send a keepalive ping */ 618 unsigned long expect_rx_by; /* When we expect to get a packet by */ 619 unsigned long expect_req_by; /* When we expect to get a request DATA packet by */ 620 unsigned long expect_term_by; /* When we expect call termination by */ 621 u32 next_rx_timo; /* Timeout for next Rx packet (jif) */ 622 u32 next_req_timo; /* Timeout for next Rx request packet (jif) */ 623 u32 hard_timo; /* Maximum lifetime or 0 (jif) */ 624 struct timer_list timer; /* Combined event timer */ 625 struct work_struct destroyer; /* In-process-context destroyer */ 626 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */ 627 struct list_head link; /* link in master call list */ 628 struct list_head wait_link; /* Link in local->new_client_calls */ 629 struct hlist_node error_link; /* link in error distribution list */ 630 struct list_head accept_link; /* Link in rx->acceptq */ 631 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */ 632 struct list_head sock_link; /* Link in rx->sock_calls */ 633 struct rb_node sock_node; /* Node in rx->calls */ 634 struct list_head attend_link; /* Link in local->call_attend_q */ 635 struct rxrpc_txbuf *tx_pending; /* Tx buffer being filled */ 636 wait_queue_head_t waitq; /* Wait queue for channel or Tx */ 637 s64 tx_total_len; /* Total length left to be transmitted (or -1) */ 638 unsigned long user_call_ID; /* user-defined call ID */ 639 unsigned long flags; 640 unsigned long events; 641 spinlock_t notify_lock; /* Kernel notification lock */ 642 unsigned int send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */ 643 s32 send_abort; /* Abort code to be sent */ 644 short send_abort_err; /* Error to be associated with the abort */ 645 rxrpc_seq_t send_abort_seq; /* DATA packet that incurred the abort (or 0) */ 646 s32 abort_code; /* Local/remote abort code */ 647 int error; /* Local error incurred */ 648 enum rxrpc_call_state _state; /* Current state of call (needs barrier) */ 649 enum rxrpc_call_completion completion; /* Call completion condition */ 650 refcount_t ref; 651 u8 security_ix; /* Security type */ 652 enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */ 653 u32 call_id; /* call ID on connection */ 654 u32 cid; /* connection ID plus channel index */ 655 u32 security_level; /* Security level selected */ 656 int debug_id; /* debug ID for printks */ 657 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */ 658 unsigned short rx_pkt_len; /* Current recvmsg packet len */ 659 660 /* Transmitted data tracking. */ 661 spinlock_t tx_lock; /* Transmit queue lock */ 662 struct list_head tx_sendmsg; /* Sendmsg prepared packets */ 663 struct list_head tx_buffer; /* Buffer of transmissible packets */ 664 rxrpc_seq_t tx_bottom; /* First packet in buffer */ 665 rxrpc_seq_t tx_transmitted; /* Highest packet transmitted */ 666 rxrpc_seq_t tx_prepared; /* Highest Tx slot prepared. */ 667 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */ 668 u16 tx_backoff; /* Delay to insert due to Tx failure */ 669 u8 tx_winsize; /* Maximum size of Tx window */ 670 #define RXRPC_TX_MAX_WINDOW 128 671 ktime_t tx_last_sent; /* Last time a transmission occurred */ 672 673 /* Received data tracking */ 674 struct sk_buff_head recvmsg_queue; /* Queue of packets ready for recvmsg() */ 675 struct sk_buff_head rx_oos_queue; /* Queue of out of sequence packets */ 676 677 rxrpc_seq_t rx_highest_seq; /* Higest sequence number received */ 678 rxrpc_seq_t rx_consumed; /* Highest packet consumed */ 679 rxrpc_serial_t rx_serial; /* Highest serial received for this call */ 680 u8 rx_winsize; /* Size of Rx window */ 681 682 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS 683 * is fixed, we keep these numbers in terms of segments (ie. DATA 684 * packets) rather than bytes. 685 */ 686 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN 687 #define RXRPC_MIN_CWND (RXRPC_TX_SMSS > 2190 ? 2 : RXRPC_TX_SMSS > 1095 ? 3 : 4) 688 u8 cong_cwnd; /* Congestion window size */ 689 u8 cong_extra; /* Extra to send for congestion management */ 690 u8 cong_ssthresh; /* Slow-start threshold */ 691 enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */ 692 u8 cong_dup_acks; /* Count of ACKs showing missing packets */ 693 u8 cong_cumul_acks; /* Cumulative ACK count */ 694 ktime_t cong_tstamp; /* Last time cwnd was changed */ 695 696 /* Receive-phase ACK management (ACKs we send). */ 697 u8 ackr_reason; /* reason to ACK */ 698 u16 ackr_sack_base; /* Starting slot in SACK table ring */ 699 rxrpc_serial_t ackr_serial; /* serial of packet being ACK'd */ 700 rxrpc_seq_t ackr_window; /* Base of SACK window */ 701 rxrpc_seq_t ackr_wtop; /* Base of SACK window */ 702 unsigned int ackr_nr_unacked; /* Number of unacked packets */ 703 atomic_t ackr_nr_consumed; /* Number of packets needing hard ACK */ 704 struct { 705 #define RXRPC_SACK_SIZE 256 706 /* SACK table for soft-acked packets */ 707 u8 ackr_sack_table[RXRPC_SACK_SIZE]; 708 } __aligned(8); 709 710 /* RTT management */ 711 rxrpc_serial_t rtt_serial[4]; /* Serial number of DATA or PING sent */ 712 ktime_t rtt_sent_at[4]; /* Time packet sent */ 713 unsigned long rtt_avail; /* Mask of available slots in bits 0-3, 714 * Mask of pending samples in 8-11 */ 715 #define RXRPC_CALL_RTT_AVAIL_MASK 0xf 716 #define RXRPC_CALL_RTT_PEND_SHIFT 8 717 718 /* Transmission-phase ACK management (ACKs we've received). */ 719 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */ 720 rxrpc_seq_t acks_first_seq; /* first sequence number received */ 721 rxrpc_seq_t acks_prev_seq; /* Highest previousPacket received */ 722 rxrpc_seq_t acks_hard_ack; /* Latest hard-ack point */ 723 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */ 724 rxrpc_serial_t acks_highest_serial; /* Highest serial number ACK'd */ 725 }; 726 727 /* 728 * Summary of a new ACK and the changes it made to the Tx buffer packet states. 729 */ 730 struct rxrpc_ack_summary { 731 u16 nr_acks; /* Number of ACKs in packet */ 732 u16 nr_new_acks; /* Number of new ACKs in packet */ 733 u16 nr_rot_new_acks; /* Number of rotated new ACKs */ 734 u8 ack_reason; 735 bool saw_nacks; /* Saw NACKs in packet */ 736 bool new_low_nack; /* T if new low NACK found */ 737 bool retrans_timeo; /* T if reTx due to timeout happened */ 738 u8 flight_size; /* Number of unreceived transmissions */ 739 /* Place to stash values for tracing */ 740 enum rxrpc_congest_mode mode:8; 741 u8 cwnd; 742 u8 ssthresh; 743 u8 dup_acks; 744 u8 cumulative_acks; 745 }; 746 747 /* 748 * sendmsg() cmsg-specified parameters. 749 */ 750 enum rxrpc_command { 751 RXRPC_CMD_SEND_DATA, /* send data message */ 752 RXRPC_CMD_SEND_ABORT, /* request abort generation */ 753 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */ 754 RXRPC_CMD_CHARGE_ACCEPT, /* [server] charge accept preallocation */ 755 }; 756 757 struct rxrpc_call_params { 758 s64 tx_total_len; /* Total Tx data length (if send data) */ 759 unsigned long user_call_ID; /* User's call ID */ 760 struct { 761 u32 hard; /* Maximum lifetime (sec) */ 762 u32 idle; /* Max time since last data packet (msec) */ 763 u32 normal; /* Max time since last call packet (msec) */ 764 } timeouts; 765 u8 nr_timeouts; /* Number of timeouts specified */ 766 bool kernel; /* T if kernel is making the call */ 767 enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */ 768 }; 769 770 struct rxrpc_send_params { 771 struct rxrpc_call_params call; 772 u32 abort_code; /* Abort code to Tx (if abort) */ 773 enum rxrpc_command command : 8; /* The command to implement */ 774 bool exclusive; /* Shared or exclusive call */ 775 bool upgrade; /* If the connection is upgradeable */ 776 }; 777 778 /* 779 * Buffer of data to be output as a packet. 780 */ 781 struct rxrpc_txbuf { 782 struct rcu_head rcu; 783 struct list_head call_link; /* Link in call->tx_sendmsg/tx_buffer */ 784 struct list_head tx_link; /* Link in live Enc queue or Tx queue */ 785 ktime_t last_sent; /* Time at which last transmitted */ 786 refcount_t ref; 787 rxrpc_seq_t seq; /* Sequence number of this packet */ 788 unsigned int call_debug_id; 789 unsigned int debug_id; 790 unsigned int len; /* Amount of data in buffer */ 791 unsigned int space; /* Remaining data space */ 792 unsigned int offset; /* Offset of fill point */ 793 unsigned long flags; 794 #define RXRPC_TXBUF_LAST 0 /* Set if last packet in Tx phase */ 795 #define RXRPC_TXBUF_RESENT 1 /* Set if has been resent */ 796 u8 /*enum rxrpc_propose_ack_trace*/ ack_why; /* If ack, why */ 797 struct { 798 /* The packet for encrypting and DMA'ing. We align it such 799 * that data[] aligns correctly for any crypto blocksize. 800 */ 801 u8 pad[64 - sizeof(struct rxrpc_wire_header)]; 802 struct rxrpc_wire_header wire; /* Network-ready header */ 803 union { 804 u8 data[RXRPC_JUMBO_DATALEN]; /* Data packet */ 805 struct { 806 struct rxrpc_ackpacket ack; 807 DECLARE_FLEX_ARRAY(u8, acks); 808 }; 809 }; 810 } __aligned(64); 811 }; 812 813 static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb) 814 { 815 return txb->wire.flags & RXRPC_CLIENT_INITIATED; 816 } 817 818 static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb) 819 { 820 return !rxrpc_sending_to_server(txb); 821 } 822 823 #include <trace/events/rxrpc.h> 824 825 /* 826 * af_rxrpc.c 827 */ 828 extern atomic_t rxrpc_n_rx_skbs; 829 extern struct workqueue_struct *rxrpc_workqueue; 830 831 /* 832 * call_accept.c 833 */ 834 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t); 835 void rxrpc_discard_prealloc(struct rxrpc_sock *); 836 bool rxrpc_new_incoming_call(struct rxrpc_local *local, 837 struct rxrpc_peer *peer, 838 struct rxrpc_connection *conn, 839 struct sockaddr_rxrpc *peer_srx, 840 struct sk_buff *skb); 841 void rxrpc_accept_incoming_calls(struct rxrpc_local *); 842 int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long); 843 844 /* 845 * call_event.c 846 */ 847 void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial, 848 enum rxrpc_propose_ack_trace why); 849 void rxrpc_send_ACK(struct rxrpc_call *, u8, rxrpc_serial_t, enum rxrpc_propose_ack_trace); 850 void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t, 851 enum rxrpc_propose_ack_trace); 852 void rxrpc_shrink_call_tx_buffer(struct rxrpc_call *); 853 void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb); 854 855 void rxrpc_reduce_call_timer(struct rxrpc_call *call, 856 unsigned long expire_at, 857 unsigned long now, 858 enum rxrpc_timer_trace why); 859 860 bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb); 861 862 /* 863 * call_object.c 864 */ 865 extern const char *const rxrpc_call_states[]; 866 extern const char *const rxrpc_call_completions[]; 867 extern struct kmem_cache *rxrpc_call_jar; 868 869 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what); 870 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long); 871 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int); 872 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *, 873 struct rxrpc_conn_parameters *, 874 struct rxrpc_call_params *, gfp_t, 875 unsigned int); 876 void rxrpc_start_call_timer(struct rxrpc_call *call); 877 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *, 878 struct sk_buff *); 879 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *); 880 void rxrpc_release_calls_on_socket(struct rxrpc_sock *); 881 void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace); 882 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 883 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 884 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace); 885 void rxrpc_cleanup_call(struct rxrpc_call *); 886 void rxrpc_destroy_all_calls(struct rxrpc_net *); 887 888 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call) 889 { 890 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags); 891 } 892 893 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call) 894 { 895 return !rxrpc_is_service_call(call); 896 } 897 898 /* 899 * call_state.c 900 */ 901 bool rxrpc_set_call_completion(struct rxrpc_call *call, 902 enum rxrpc_call_completion compl, 903 u32 abort_code, 904 int error); 905 bool rxrpc_call_completed(struct rxrpc_call *call); 906 bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq, 907 u32 abort_code, int error, enum rxrpc_abort_reason why); 908 void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl, 909 int error); 910 911 static inline void rxrpc_set_call_state(struct rxrpc_call *call, 912 enum rxrpc_call_state state) 913 { 914 /* Order write of completion info before write of ->state. */ 915 smp_store_release(&call->_state, state); 916 wake_up(&call->waitq); 917 } 918 919 static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call) 920 { 921 return call->_state; /* Only inside I/O thread */ 922 } 923 924 static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call) 925 { 926 return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; 927 } 928 929 static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call) 930 { 931 /* Order read ->state before read of completion info. */ 932 return smp_load_acquire(&call->_state); 933 } 934 935 static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call) 936 { 937 return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; 938 } 939 940 static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call) 941 { 942 return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED; 943 } 944 945 /* 946 * conn_client.c 947 */ 948 extern unsigned int rxrpc_reap_client_connections; 949 extern unsigned long rxrpc_conn_idle_client_expiry; 950 extern unsigned long rxrpc_conn_idle_client_fast_expiry; 951 952 void rxrpc_purge_client_connections(struct rxrpc_local *local); 953 struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 954 void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 955 int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp); 956 void rxrpc_connect_client_calls(struct rxrpc_local *local); 957 void rxrpc_expose_client_call(struct rxrpc_call *); 958 void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *); 959 void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle); 960 void rxrpc_put_client_conn(struct rxrpc_connection *, enum rxrpc_conn_trace); 961 void rxrpc_discard_expired_client_conns(struct rxrpc_local *local); 962 void rxrpc_clean_up_local_conns(struct rxrpc_local *); 963 964 /* 965 * conn_event.c 966 */ 967 void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb, 968 unsigned int channel); 969 int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb, 970 s32 abort_code, int err, enum rxrpc_abort_reason why); 971 void rxrpc_process_connection(struct work_struct *); 972 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool); 973 bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb); 974 void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb); 975 976 static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn) 977 { 978 /* Order reading the abort info after the state check. */ 979 return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED; 980 } 981 982 /* 983 * conn_object.c 984 */ 985 extern unsigned int rxrpc_connection_expiry; 986 extern unsigned int rxrpc_closed_conn_expiry; 987 988 void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why); 989 struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t); 990 struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *, 991 struct sockaddr_rxrpc *, 992 struct sk_buff *); 993 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *); 994 void rxrpc_disconnect_call(struct rxrpc_call *); 995 void rxrpc_kill_client_conn(struct rxrpc_connection *); 996 void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace); 997 void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 998 struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *, 999 enum rxrpc_conn_trace); 1000 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *, 1001 enum rxrpc_conn_trace); 1002 void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 1003 void rxrpc_service_connection_reaper(struct work_struct *); 1004 void rxrpc_destroy_all_connections(struct rxrpc_net *); 1005 1006 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn) 1007 { 1008 return conn->out_clientflag; 1009 } 1010 1011 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn) 1012 { 1013 return !rxrpc_conn_is_client(conn); 1014 } 1015 1016 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn, 1017 unsigned long expire_at) 1018 { 1019 timer_reduce(&conn->timer, expire_at); 1020 } 1021 1022 /* 1023 * conn_service.c 1024 */ 1025 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *, 1026 struct sk_buff *); 1027 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t); 1028 void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *, 1029 const struct rxrpc_security *, struct sk_buff *); 1030 void rxrpc_unpublish_service_conn(struct rxrpc_connection *); 1031 1032 /* 1033 * input.c 1034 */ 1035 void rxrpc_congestion_degrade(struct rxrpc_call *); 1036 void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *); 1037 void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *); 1038 1039 /* 1040 * io_thread.c 1041 */ 1042 int rxrpc_encap_rcv(struct sock *, struct sk_buff *); 1043 void rxrpc_error_report(struct sock *); 1044 bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why, 1045 s32 abort_code, int err); 1046 int rxrpc_io_thread(void *data); 1047 static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local) 1048 { 1049 wake_up_process(local->io_thread); 1050 } 1051 1052 static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why) 1053 { 1054 return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO); 1055 } 1056 1057 /* 1058 * insecure.c 1059 */ 1060 extern const struct rxrpc_security rxrpc_no_security; 1061 1062 /* 1063 * key.c 1064 */ 1065 extern struct key_type key_type_rxrpc; 1066 1067 int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int); 1068 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t, 1069 u32); 1070 1071 /* 1072 * local_event.c 1073 */ 1074 void rxrpc_gen_version_string(void); 1075 void rxrpc_send_version_request(struct rxrpc_local *local, 1076 struct rxrpc_host_header *hdr, 1077 struct sk_buff *skb); 1078 1079 /* 1080 * local_object.c 1081 */ 1082 void rxrpc_local_dont_fragment(const struct rxrpc_local *local, bool set); 1083 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *); 1084 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace); 1085 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace); 1086 void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace); 1087 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace); 1088 void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace); 1089 void rxrpc_destroy_local(struct rxrpc_local *local); 1090 void rxrpc_destroy_all_locals(struct rxrpc_net *); 1091 1092 static inline bool __rxrpc_use_local(struct rxrpc_local *local, 1093 enum rxrpc_local_trace why) 1094 { 1095 int r, u; 1096 1097 r = refcount_read(&local->ref); 1098 u = atomic_fetch_add_unless(&local->active_users, 1, 0); 1099 trace_rxrpc_local(local->debug_id, why, r, u); 1100 return u != 0; 1101 } 1102 1103 static inline void rxrpc_see_local(struct rxrpc_local *local, 1104 enum rxrpc_local_trace why) 1105 { 1106 int r, u; 1107 1108 r = refcount_read(&local->ref); 1109 u = atomic_read(&local->active_users); 1110 trace_rxrpc_local(local->debug_id, why, r, u); 1111 } 1112 1113 /* 1114 * misc.c 1115 */ 1116 extern unsigned int rxrpc_max_backlog __read_mostly; 1117 extern unsigned long rxrpc_soft_ack_delay; 1118 extern unsigned long rxrpc_idle_ack_delay; 1119 extern unsigned int rxrpc_rx_window_size; 1120 extern unsigned int rxrpc_rx_mtu; 1121 extern unsigned int rxrpc_rx_jumbo_max; 1122 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY 1123 extern unsigned long rxrpc_inject_rx_delay; 1124 #endif 1125 1126 /* 1127 * net_ns.c 1128 */ 1129 extern unsigned int rxrpc_net_id; 1130 extern struct pernet_operations rxrpc_net_ops; 1131 1132 static inline struct rxrpc_net *rxrpc_net(struct net *net) 1133 { 1134 return net_generic(net, rxrpc_net_id); 1135 } 1136 1137 /* 1138 * output.c 1139 */ 1140 int rxrpc_send_ack_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb); 1141 int rxrpc_send_abort_packet(struct rxrpc_call *); 1142 int rxrpc_send_data_packet(struct rxrpc_call *, struct rxrpc_txbuf *); 1143 void rxrpc_send_conn_abort(struct rxrpc_connection *conn); 1144 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb); 1145 void rxrpc_send_keepalive(struct rxrpc_peer *); 1146 void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb); 1147 1148 /* 1149 * peer_event.c 1150 */ 1151 void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *); 1152 void rxrpc_peer_keepalive_worker(struct work_struct *); 1153 1154 /* 1155 * peer_object.c 1156 */ 1157 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *, 1158 const struct sockaddr_rxrpc *); 1159 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local, 1160 struct sockaddr_rxrpc *srx, gfp_t gfp); 1161 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t, 1162 enum rxrpc_peer_trace); 1163 void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer); 1164 void rxrpc_destroy_all_peers(struct rxrpc_net *); 1165 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1166 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace); 1167 void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1168 1169 /* 1170 * proc.c 1171 */ 1172 extern const struct seq_operations rxrpc_call_seq_ops; 1173 extern const struct seq_operations rxrpc_connection_seq_ops; 1174 extern const struct seq_operations rxrpc_bundle_seq_ops; 1175 extern const struct seq_operations rxrpc_peer_seq_ops; 1176 extern const struct seq_operations rxrpc_local_seq_ops; 1177 1178 /* 1179 * recvmsg.c 1180 */ 1181 void rxrpc_notify_socket(struct rxrpc_call *); 1182 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int); 1183 1184 /* 1185 * Abort a call due to a protocol error. 1186 */ 1187 static inline int rxrpc_abort_eproto(struct rxrpc_call *call, 1188 struct sk_buff *skb, 1189 s32 abort_code, 1190 enum rxrpc_abort_reason why) 1191 { 1192 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 1193 1194 rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why); 1195 return -EPROTO; 1196 } 1197 1198 /* 1199 * rtt.c 1200 */ 1201 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, int, 1202 rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t); 1203 unsigned long rxrpc_get_rto_backoff(struct rxrpc_peer *, bool); 1204 void rxrpc_peer_init_rtt(struct rxrpc_peer *); 1205 1206 /* 1207 * rxkad.c 1208 */ 1209 #ifdef CONFIG_RXKAD 1210 extern const struct rxrpc_security rxkad; 1211 #endif 1212 1213 /* 1214 * security.c 1215 */ 1216 int __init rxrpc_init_security(void); 1217 const struct rxrpc_security *rxrpc_security_lookup(u8); 1218 void rxrpc_exit_security(void); 1219 int rxrpc_init_client_call_security(struct rxrpc_call *); 1220 int rxrpc_init_client_conn_security(struct rxrpc_connection *); 1221 const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *, 1222 struct sk_buff *); 1223 struct key *rxrpc_look_up_server_security(struct rxrpc_connection *, 1224 struct sk_buff *, u32, u32); 1225 1226 /* 1227 * sendmsg.c 1228 */ 1229 bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error, 1230 enum rxrpc_abort_reason why); 1231 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t); 1232 1233 /* 1234 * server_key.c 1235 */ 1236 extern struct key_type key_type_rxrpc_s; 1237 1238 int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int); 1239 1240 /* 1241 * skbuff.c 1242 */ 1243 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *); 1244 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace); 1245 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace); 1246 void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace); 1247 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace); 1248 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace); 1249 void rxrpc_purge_queue(struct sk_buff_head *); 1250 1251 /* 1252 * stats.c 1253 */ 1254 int rxrpc_stats_show(struct seq_file *seq, void *v); 1255 int rxrpc_stats_clear(struct file *file, char *buf, size_t size); 1256 1257 #define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s) 1258 #define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s) 1259 1260 /* 1261 * sysctl.c 1262 */ 1263 #ifdef CONFIG_SYSCTL 1264 extern int __init rxrpc_sysctl_init(void); 1265 extern void rxrpc_sysctl_exit(void); 1266 #else 1267 static inline int __init rxrpc_sysctl_init(void) { return 0; } 1268 static inline void rxrpc_sysctl_exit(void) {} 1269 #endif 1270 1271 /* 1272 * txbuf.c 1273 */ 1274 extern atomic_t rxrpc_nr_txbuf; 1275 struct rxrpc_txbuf *rxrpc_alloc_txbuf(struct rxrpc_call *call, u8 packet_type, 1276 gfp_t gfp); 1277 void rxrpc_get_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1278 void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1279 void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1280 1281 /* 1282 * utils.c 1283 */ 1284 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *); 1285 1286 static inline bool before(u32 seq1, u32 seq2) 1287 { 1288 return (s32)(seq1 - seq2) < 0; 1289 } 1290 static inline bool before_eq(u32 seq1, u32 seq2) 1291 { 1292 return (s32)(seq1 - seq2) <= 0; 1293 } 1294 static inline bool after(u32 seq1, u32 seq2) 1295 { 1296 return (s32)(seq1 - seq2) > 0; 1297 } 1298 static inline bool after_eq(u32 seq1, u32 seq2) 1299 { 1300 return (s32)(seq1 - seq2) >= 0; 1301 } 1302 1303 /* 1304 * debug tracing 1305 */ 1306 extern unsigned int rxrpc_debug; 1307 1308 #define dbgprintk(FMT,...) \ 1309 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1310 1311 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1312 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1313 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1314 1315 1316 #if defined(__KDEBUG) 1317 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1318 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1319 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1320 1321 #elif defined(CONFIG_AF_RXRPC_DEBUG) 1322 #define RXRPC_DEBUG_KENTER 0x01 1323 #define RXRPC_DEBUG_KLEAVE 0x02 1324 #define RXRPC_DEBUG_KDEBUG 0x04 1325 1326 #define _enter(FMT,...) \ 1327 do { \ 1328 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \ 1329 kenter(FMT,##__VA_ARGS__); \ 1330 } while (0) 1331 1332 #define _leave(FMT,...) \ 1333 do { \ 1334 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \ 1335 kleave(FMT,##__VA_ARGS__); \ 1336 } while (0) 1337 1338 #define _debug(FMT,...) \ 1339 do { \ 1340 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \ 1341 kdebug(FMT,##__VA_ARGS__); \ 1342 } while (0) 1343 1344 #else 1345 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1346 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1347 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1348 #endif 1349 1350 /* 1351 * debug assertion checking 1352 */ 1353 #if 1 // defined(__KDEBUGALL) 1354 1355 #define ASSERT(X) \ 1356 do { \ 1357 if (unlikely(!(X))) { \ 1358 pr_err("Assertion failed\n"); \ 1359 BUG(); \ 1360 } \ 1361 } while (0) 1362 1363 #define ASSERTCMP(X, OP, Y) \ 1364 do { \ 1365 __typeof__(X) _x = (X); \ 1366 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1367 if (unlikely(!(_x OP _y))) { \ 1368 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1369 (unsigned long)_x, (unsigned long)_x, #OP, \ 1370 (unsigned long)_y, (unsigned long)_y); \ 1371 BUG(); \ 1372 } \ 1373 } while (0) 1374 1375 #define ASSERTIF(C, X) \ 1376 do { \ 1377 if (unlikely((C) && !(X))) { \ 1378 pr_err("Assertion failed\n"); \ 1379 BUG(); \ 1380 } \ 1381 } while (0) 1382 1383 #define ASSERTIFCMP(C, X, OP, Y) \ 1384 do { \ 1385 __typeof__(X) _x = (X); \ 1386 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1387 if (unlikely((C) && !(_x OP _y))) { \ 1388 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1389 (unsigned long)_x, (unsigned long)_x, #OP, \ 1390 (unsigned long)_y, (unsigned long)_y); \ 1391 BUG(); \ 1392 } \ 1393 } while (0) 1394 1395 #else 1396 1397 #define ASSERT(X) \ 1398 do { \ 1399 } while (0) 1400 1401 #define ASSERTCMP(X, OP, Y) \ 1402 do { \ 1403 } while (0) 1404 1405 #define ASSERTIF(C, X) \ 1406 do { \ 1407 } while (0) 1408 1409 #define ASSERTIFCMP(C, X, OP, Y) \ 1410 do { \ 1411 } while (0) 1412 1413 #endif /* __KDEBUGALL */ 1414