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 struct rxrpc_txqueue; 34 struct rxgk_context; 35 36 /* 37 * Mark applied to socket buffers in skb->mark. skb->priority is used 38 * to pass supplementary information. 39 */ 40 enum rxrpc_skb_mark { 41 RXRPC_SKB_MARK_PACKET, /* Received packet */ 42 RXRPC_SKB_MARK_ERROR, /* Error notification */ 43 RXRPC_SKB_MARK_CHALLENGE, /* Challenge notification */ 44 RXRPC_SKB_MARK_SERVICE_CONN_SECURED, /* Service connection response has been verified */ 45 RXRPC_SKB_MARK_REJECT_BUSY, /* Reject with BUSY */ 46 RXRPC_SKB_MARK_REJECT_ABORT, /* Reject with ABORT (code in skb->priority) */ 47 RXRPC_SKB_MARK_REJECT_CONN_ABORT, /* Reject with connection ABORT (code in skb->priority) */ 48 }; 49 50 /* 51 * sk_state for RxRPC sockets 52 */ 53 enum { 54 RXRPC_UNBOUND = 0, 55 RXRPC_CLIENT_UNBOUND, /* Unbound socket used as client */ 56 RXRPC_CLIENT_BOUND, /* client local address bound */ 57 RXRPC_SERVER_BOUND, /* server local address bound */ 58 RXRPC_SERVER_BOUND2, /* second server local address bound */ 59 RXRPC_SERVER_LISTENING, /* server listening for connections */ 60 RXRPC_SERVER_LISTEN_DISABLED, /* server listening disabled */ 61 RXRPC_CLOSE, /* socket is being closed */ 62 }; 63 64 /* 65 * Per-network namespace data. 66 */ 67 struct rxrpc_net { 68 struct proc_dir_entry *proc_net; /* Subdir in /proc/net */ 69 u32 epoch; /* Local epoch for detecting local-end reset */ 70 struct list_head calls; /* List of calls active in this namespace */ 71 spinlock_t call_lock; /* Lock for ->calls */ 72 atomic_t nr_calls; /* Count of allocated calls */ 73 74 atomic_t nr_conns; 75 struct list_head bundle_proc_list; /* List of bundles for proc */ 76 struct list_head conn_proc_list; /* List of conns in this namespace for proc */ 77 struct list_head service_conns; /* Service conns in this namespace */ 78 rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */ 79 struct work_struct service_conn_reaper; 80 struct timer_list service_conn_reap_timer; 81 82 bool live; 83 84 atomic_t nr_client_conns; 85 86 struct hlist_head local_endpoints; 87 struct mutex local_mutex; /* Lock for ->local_endpoints */ 88 89 DECLARE_HASHTABLE (peer_hash, 10); 90 spinlock_t peer_hash_lock; /* Lock for ->peer_hash */ 91 92 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */ 93 u8 peer_keepalive_cursor; 94 time64_t peer_keepalive_base; 95 struct list_head peer_keepalive[32]; 96 struct list_head peer_keepalive_new; 97 struct timer_list peer_keepalive_timer; 98 struct work_struct peer_keepalive_work; 99 100 atomic_t stat_tx_data; 101 atomic_t stat_tx_data_retrans; 102 atomic_t stat_tx_data_send; 103 atomic_t stat_tx_data_send_frag; 104 atomic_t stat_tx_data_send_fail; 105 atomic_t stat_tx_data_send_msgsize; 106 atomic_t stat_tx_data_underflow; 107 atomic_t stat_tx_data_cwnd_reset; 108 atomic_t stat_rx_data; 109 atomic_t stat_rx_data_reqack; 110 atomic_t stat_rx_data_jumbo; 111 112 atomic_t stat_tx_ack_fill; 113 atomic_t stat_tx_ack_send; 114 atomic_t stat_tx_ack_skip; 115 atomic_t stat_tx_acks[256]; 116 atomic_t stat_rx_acks[256]; 117 atomic_t stat_tx_jumbo[10]; 118 atomic_t stat_rx_jumbo[10]; 119 120 atomic_t stat_why_req_ack[9]; 121 122 atomic_t stat_io_loop; 123 }; 124 125 /* 126 * Service backlog preallocation. 127 * 128 * This contains circular buffers of preallocated peers, connections and calls 129 * for incoming service calls and their head and tail pointers. This allows 130 * calls to be set up in the data_ready handler, thereby avoiding the need to 131 * shuffle packets around so much. 132 */ 133 struct rxrpc_backlog { 134 unsigned short peer_backlog_head; 135 unsigned short peer_backlog_tail; 136 unsigned short conn_backlog_head; 137 unsigned short conn_backlog_tail; 138 unsigned short call_backlog_head; 139 unsigned short call_backlog_tail; 140 #define RXRPC_BACKLOG_MAX 32 141 struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX]; 142 struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX]; 143 struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX]; 144 }; 145 146 /* 147 * RxRPC socket definition 148 */ 149 struct rxrpc_sock { 150 /* WARNING: sk has to be the first member */ 151 struct sock sk; 152 const struct rxrpc_kernel_ops *app_ops; /* Table of kernel app notification funcs */ 153 struct rxrpc_local *local; /* local endpoint */ 154 struct rxrpc_backlog *backlog; /* Preallocation for services */ 155 struct sk_buff_head recvmsg_oobq; /* OOB messages for recvmsg to pick up */ 156 struct rb_root pending_oobq; /* OOB messages awaiting userspace to respond to */ 157 u64 oob_id_counter; /* OOB message ID counter */ 158 spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */ 159 struct list_head sock_calls; /* List of calls owned by this socket */ 160 struct list_head to_be_accepted; /* calls awaiting acceptance */ 161 struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */ 162 spinlock_t recvmsg_lock; /* Lock for recvmsg_q */ 163 struct key *key; /* security for this socket */ 164 struct key *securities; /* list of server security descriptors */ 165 struct rb_root calls; /* User ID -> call mapping */ 166 unsigned long flags; 167 #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */ 168 #define RXRPC_SOCK_MANAGE_RESPONSE 1 /* User wants to manage RESPONSE packets */ 169 rwlock_t call_lock; /* lock for calls */ 170 u32 min_sec_level; /* minimum security level */ 171 #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT 172 bool exclusive; /* Exclusive connection for a client socket */ 173 u16 second_service; /* Additional service bound to the endpoint */ 174 struct { 175 /* Service upgrade information */ 176 u16 from; /* Service ID to upgrade (if not 0) */ 177 u16 to; /* service ID to upgrade to */ 178 } service_upgrade; 179 sa_family_t family; /* Protocol family created with */ 180 struct sockaddr_rxrpc srx; /* Primary Service/local addresses */ 181 struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */ 182 }; 183 184 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk) 185 186 /* 187 * CPU-byteorder normalised Rx packet header. 188 */ 189 struct rxrpc_host_header { 190 u32 epoch; /* client boot timestamp */ 191 u32 cid; /* connection and channel ID */ 192 u32 callNumber; /* call ID (0 for connection-level packets) */ 193 u32 seq; /* sequence number of pkt in call stream */ 194 u32 serial; /* serial number of pkt sent to network */ 195 u8 type; /* packet type */ 196 u8 flags; /* packet flags */ 197 u8 userStatus; /* app-layer defined status */ 198 u8 securityIndex; /* security protocol ID */ 199 union { 200 u16 _rsvd; /* reserved */ 201 u16 cksum; /* kerberos security checksum */ 202 }; 203 u16 serviceId; /* service ID */ 204 } __packed; 205 206 /* 207 * RxRPC socket buffer private variables 208 * - max 48 bytes (struct sk_buff::cb) 209 */ 210 struct rxrpc_skb_priv { 211 union { 212 struct rxrpc_connection *poke_conn; /* Conn referred to (poke packet) */ 213 struct { 214 u16 offset; /* Offset of data */ 215 u16 len; /* Length of data */ 216 }; 217 struct { 218 rxrpc_seq_t first_ack; /* First packet in acks table */ 219 rxrpc_seq_t prev_ack; /* Highest seq seen */ 220 rxrpc_serial_t acked_serial; /* Packet in response to (or 0) */ 221 u16 nr_acks; /* Number of acks+nacks */ 222 u8 reason; /* Reason for ack */ 223 } ack; 224 struct { 225 struct rxrpc_connection *conn; /* Connection referred to */ 226 union { 227 u32 rxkad_nonce; 228 }; 229 } chall; 230 struct { 231 rxrpc_serial_t challenge_serial; 232 u32 kvno; 233 u32 version; 234 u16 len; 235 u16 ticket_len; 236 } resp; 237 }; 238 struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */ 239 }; 240 241 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb) 242 243 /* 244 * RxRPC security module interface 245 */ 246 struct rxrpc_security { 247 const char *name; /* name of this service */ 248 u8 security_index; /* security type provided */ 249 u32 no_key_abort; /* Abort code indicating no key */ 250 251 /* Initialise a security service */ 252 int (*init)(void); 253 254 /* Clean up a security service */ 255 void (*exit)(void); 256 257 /* Parse the information from a server key */ 258 int (*preparse_server_key)(struct key_preparsed_payload *); 259 260 /* Clean up the preparse buffer after parsing a server key */ 261 void (*free_preparse_server_key)(struct key_preparsed_payload *); 262 263 /* Destroy the payload of a server key */ 264 void (*destroy_server_key)(struct key *); 265 266 /* Describe a server key */ 267 void (*describe_server_key)(const struct key *, struct seq_file *); 268 269 /* initialise a connection's security */ 270 int (*init_connection_security)(struct rxrpc_connection *, 271 struct rxrpc_key_token *); 272 273 /* Work out how much data we can store in a packet, given an estimate 274 * of the amount of data remaining and allocate a data buffer. 275 */ 276 struct rxrpc_txbuf *(*alloc_txbuf)(struct rxrpc_call *call, size_t remaining, gfp_t gfp); 277 278 /* impose security on a packet */ 279 int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *); 280 281 /* verify the security on a received packet */ 282 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *); 283 284 /* Free crypto request on a call */ 285 void (*free_call_crypto)(struct rxrpc_call *); 286 287 /* issue a challenge */ 288 int (*issue_challenge)(struct rxrpc_connection *); 289 290 /* Validate a challenge packet */ 291 bool (*validate_challenge)(struct rxrpc_connection *conn, 292 struct sk_buff *skb); 293 294 /* Fill out the cmsg for recvmsg() to pass on a challenge to userspace. 295 * The security class gets to add additional information. 296 */ 297 int (*challenge_to_recvmsg)(struct rxrpc_connection *conn, 298 struct sk_buff *challenge, 299 struct msghdr *msg); 300 301 /* Parse sendmsg() control message and respond to challenge. */ 302 int (*sendmsg_respond_to_challenge)(struct sk_buff *challenge, 303 struct msghdr *msg); 304 305 /* respond to a challenge */ 306 int (*respond_to_challenge)(struct rxrpc_connection *conn, 307 struct sk_buff *challenge); 308 309 /* verify a response */ 310 int (*verify_response)(struct rxrpc_connection *conn, 311 struct sk_buff *response_skb, 312 void *response, unsigned int len); 313 314 /* clear connection security */ 315 void (*clear)(struct rxrpc_connection *); 316 317 /* Default ticket -> key decoder */ 318 int (*default_decode_ticket)(struct rxrpc_connection *conn, struct sk_buff *skb, 319 void *ticket, unsigned int ticket_len, 320 struct key **_key); 321 }; 322 323 /* 324 * RxRPC local transport endpoint description 325 * - owned by a single AF_RXRPC socket 326 * - pointed to by transport socket struct sk_user_data 327 */ 328 struct rxrpc_local { 329 struct rcu_head rcu; 330 atomic_t active_users; /* Number of users of the local endpoint */ 331 refcount_t ref; /* Number of references to the structure */ 332 struct net *net; /* The network namespace */ 333 struct rxrpc_net *rxnet; /* Our bits in the network namespace */ 334 struct hlist_node link; 335 struct socket *socket; /* my UDP socket */ 336 struct task_struct *io_thread; 337 struct completion io_thread_ready; /* Indication that the I/O thread started */ 338 struct page_frag_cache tx_alloc; /* Tx control packet allocation (I/O thread only) */ 339 struct rxrpc_sock *service; /* Service(s) listening on this endpoint */ 340 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY 341 struct sk_buff_head rx_delay_queue; /* Delay injection queue */ 342 #endif 343 struct sk_buff_head rx_queue; /* Received packets */ 344 struct list_head conn_attend_q; /* Conns requiring immediate attention */ 345 struct list_head call_attend_q; /* Calls requiring immediate attention */ 346 347 struct rb_root client_bundles; /* Client connection bundles by socket params */ 348 spinlock_t client_bundles_lock; /* Lock for client_bundles */ 349 bool kill_all_client_conns; 350 struct list_head idle_client_conns; 351 struct timer_list client_conn_reap_timer; 352 unsigned long client_conn_flags; 353 #define RXRPC_CLIENT_CONN_REAP_TIMER 0 /* The client conn reap timer expired */ 354 355 spinlock_t lock; /* access lock */ 356 rwlock_t services_lock; /* lock for services list */ 357 int debug_id; /* debug ID for printks */ 358 bool dead; 359 bool service_closed; /* Service socket closed */ 360 struct idr conn_ids; /* List of connection IDs */ 361 struct list_head new_client_calls; /* Newly created client calls need connection */ 362 spinlock_t client_call_lock; /* Lock for ->new_client_calls */ 363 struct sockaddr_rxrpc srx; /* local address */ 364 union { 365 /* Provide a kvec table sufficiently large to manage either a 366 * DATA packet with a maximum set of jumbo subpackets or a PING 367 * ACK padded out to 64K with zeropages for PMTUD. 368 */ 369 struct kvec kvec[1 + RXRPC_MAX_NR_JUMBO > 3 + 16 ? 370 1 + RXRPC_MAX_NR_JUMBO : 3 + 16]; 371 struct bio_vec bvec[3 + 16]; 372 }; 373 }; 374 375 /* 376 * RxRPC remote transport endpoint definition 377 * - matched by local endpoint, remote port, address and protocol type 378 */ 379 struct rxrpc_peer { 380 struct rcu_head rcu; /* This must be first */ 381 refcount_t ref; 382 unsigned long hash_key; 383 struct hlist_node hash_link; 384 struct rxrpc_local *local; 385 struct hlist_head error_targets; /* targets for net error distribution */ 386 struct rb_root service_conns; /* Service connections */ 387 struct list_head keepalive_link; /* Link in net->peer_keepalive[] */ 388 unsigned long app_data; /* Application data (e.g. afs_server) */ 389 unsigned int last_tx_at; /* Last time packet sent here (time64_t LSW) */ 390 seqlock_t service_conn_lock; 391 spinlock_t lock; /* access lock */ 392 int debug_id; /* debug ID for printks */ 393 struct sockaddr_rxrpc srx; /* remote address */ 394 395 /* Path MTU discovery [RFC8899] */ 396 unsigned int pmtud_trial; /* Current MTU probe size */ 397 unsigned int pmtud_good; /* Largest working MTU probe we've tried */ 398 unsigned int pmtud_bad; /* Smallest non-working MTU probe we've tried */ 399 bool pmtud_lost; /* T if MTU probe was lost */ 400 bool pmtud_probing; /* T if we have an active probe outstanding */ 401 bool pmtud_pending; /* T if a call to this peer should send a probe */ 402 u8 pmtud_jumbo; /* Max jumbo packets for the MTU */ 403 bool ackr_adv_pmtud; /* T if the peer advertises path-MTU */ 404 unsigned int ackr_max_data; /* Maximum data advertised by peer */ 405 unsigned int if_mtu; /* Local interface MTU (- hdrsize) for this peer */ 406 unsigned int max_data; /* Maximum packet data capacity for this peer */ 407 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */ 408 unsigned short tx_seg_max; /* Maximum number of transmissable segments */ 409 410 /* Calculated RTT cache */ 411 unsigned int recent_srtt_us; 412 unsigned int recent_rto_us; 413 414 u8 cong_ssthresh; /* Congestion slow-start threshold */ 415 }; 416 417 /* 418 * Keys for matching a connection. 419 */ 420 struct rxrpc_conn_proto { 421 union { 422 struct { 423 u32 epoch; /* epoch of this connection */ 424 u32 cid; /* connection ID */ 425 }; 426 u64 index_key; 427 }; 428 }; 429 430 struct rxrpc_conn_parameters { 431 struct rxrpc_local *local; /* Representation of local endpoint */ 432 struct rxrpc_peer *peer; /* Representation of remote endpoint */ 433 struct key *key; /* Security details */ 434 bool exclusive; /* T if conn is exclusive */ 435 bool upgrade; /* T if service ID can be upgraded */ 436 u16 service_id; /* Service ID for this connection */ 437 u32 security_level; /* Security level selected */ 438 }; 439 440 /* 441 * Call completion condition (state == RXRPC_CALL_COMPLETE). 442 */ 443 enum rxrpc_call_completion { 444 RXRPC_CALL_SUCCEEDED, /* - Normal termination */ 445 RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */ 446 RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */ 447 RXRPC_CALL_LOCAL_ERROR, /* - call failed due to local error */ 448 RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */ 449 NR__RXRPC_CALL_COMPLETIONS 450 }; 451 452 /* 453 * Bits in the connection flags. 454 */ 455 enum rxrpc_conn_flag { 456 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */ 457 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */ 458 RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */ 459 RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */ 460 RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */ 461 RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */ 462 RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */ 463 }; 464 465 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \ 466 (1UL << RXRPC_CONN_FINAL_ACK_1) | \ 467 (1UL << RXRPC_CONN_FINAL_ACK_2) | \ 468 (1UL << RXRPC_CONN_FINAL_ACK_3)) 469 470 /* 471 * Events that can be raised upon a connection. 472 */ 473 enum rxrpc_conn_event { 474 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */ 475 RXRPC_CONN_EV_ABORT_CALLS, /* Abort attached calls */ 476 }; 477 478 /* 479 * The connection protocol state. 480 */ 481 enum rxrpc_conn_proto_state { 482 RXRPC_CONN_UNUSED, /* Connection not yet attempted */ 483 RXRPC_CONN_CLIENT_UNSECURED, /* Client connection needs security init */ 484 RXRPC_CONN_CLIENT, /* Client connection */ 485 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */ 486 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */ 487 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */ 488 RXRPC_CONN_SERVICE, /* Service secured connection */ 489 RXRPC_CONN_ABORTED, /* Conn aborted */ 490 RXRPC_CONN__NR_STATES 491 }; 492 493 /* 494 * RxRPC client connection bundle. 495 */ 496 struct rxrpc_bundle { 497 struct rxrpc_local *local; /* Representation of local endpoint */ 498 struct rxrpc_peer *peer; /* Remote endpoint */ 499 struct key *key; /* Security details */ 500 struct list_head proc_link; /* Link in net->bundle_proc_list */ 501 const struct rxrpc_security *security; /* applied security module */ 502 refcount_t ref; 503 atomic_t active; /* Number of active users */ 504 unsigned int debug_id; 505 u32 security_level; /* Security level selected */ 506 u16 service_id; /* Service ID for this connection */ 507 bool try_upgrade; /* True if the bundle is attempting upgrade */ 508 bool exclusive; /* T if conn is exclusive */ 509 bool upgrade; /* T if service ID can be upgraded */ 510 unsigned short alloc_error; /* Error from last conn allocation */ 511 struct rb_node local_node; /* Node in local->client_conns */ 512 struct list_head waiting_calls; /* Calls waiting for channels */ 513 unsigned long avail_chans; /* Mask of available channels */ 514 unsigned int conn_ids[4]; /* Connection IDs. */ 515 struct rxrpc_connection *conns[4]; /* The connections in the bundle (max 4) */ 516 }; 517 518 /* 519 * RxRPC connection definition 520 * - matched by { local, peer, epoch, conn_id, direction } 521 * - each connection can only handle four simultaneous calls 522 */ 523 struct rxrpc_connection { 524 struct rxrpc_conn_proto proto; 525 struct rxrpc_local *local; /* Representation of local endpoint */ 526 struct rxrpc_peer *peer; /* Remote endpoint */ 527 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ 528 struct key *key; /* Security details */ 529 struct list_head attend_link; /* Link in local->conn_attend_q */ 530 531 refcount_t ref; 532 atomic_t active; /* Active count for service conns */ 533 struct rcu_head rcu; 534 struct list_head cache_link; 535 536 unsigned char act_chans; /* Mask of active channels */ 537 struct rxrpc_channel { 538 unsigned long final_ack_at; /* Time at which to issue final ACK */ 539 struct rxrpc_call *call; /* Active call */ 540 unsigned int call_debug_id; /* call->debug_id */ 541 u32 call_id; /* ID of current call */ 542 u32 call_counter; /* Call ID counter */ 543 u32 last_call; /* ID of last call */ 544 u8 last_type; /* Type of last packet */ 545 union { 546 u32 last_seq; 547 u32 last_abort; 548 }; 549 } channels[RXRPC_MAXCALLS]; 550 551 struct timer_list timer; /* Conn event timer */ 552 struct work_struct processor; /* connection event processor */ 553 struct work_struct destructor; /* In-process-context destroyer */ 554 struct rxrpc_bundle *bundle; /* Client connection bundle */ 555 struct rb_node service_node; /* Node in peer->service_conns */ 556 struct list_head proc_link; /* link in procfs list */ 557 struct list_head link; /* link in master connection list */ 558 struct sk_buff_head rx_queue; /* received conn-level packets */ 559 struct page_frag_cache tx_data_alloc; /* Tx DATA packet allocation */ 560 struct mutex tx_data_alloc_lock; 561 562 struct mutex security_lock; /* Lock for security management */ 563 const struct rxrpc_security *security; /* applied security module */ 564 union { 565 struct { 566 struct crypto_sync_skcipher *cipher; /* encryption handle */ 567 struct rxrpc_crypt csum_iv; /* packet checksum base */ 568 u32 nonce; /* response re-use preventer */ 569 } rxkad; 570 struct { 571 struct rxgk_context *keys[4]; /* (Re-)keying buffer */ 572 u64 start_time; /* The start time for TK derivation */ 573 u8 nonce[20]; /* Response re-use preventer */ 574 u32 enctype; /* Kerberos 5 encoding type */ 575 u32 key_number; /* Current key number */ 576 } rxgk; 577 }; 578 rwlock_t security_use_lock; /* Security use/modification lock */ 579 struct sk_buff *tx_response; /* Response packet to be transmitted */ 580 581 unsigned long flags; 582 unsigned long events; 583 unsigned long idle_timestamp; /* Time at which last became idle */ 584 spinlock_t state_lock; /* state-change lock */ 585 enum rxrpc_conn_proto_state state; /* current state of connection */ 586 enum rxrpc_call_completion completion; /* Completion condition */ 587 s32 abort_code; /* Abort code of connection abort */ 588 int debug_id; /* debug ID for printks */ 589 rxrpc_serial_t tx_serial; /* Outgoing packet serial number counter */ 590 unsigned int hi_serial; /* highest serial number received */ 591 rxrpc_serial_t pmtud_probe; /* Serial of MTU probe (or 0) */ 592 unsigned int pmtud_call; /* ID of call used for probe */ 593 u32 service_id; /* Service ID, possibly upgraded */ 594 u32 security_level; /* Security level selected */ 595 u8 security_ix; /* security type */ 596 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */ 597 u8 bundle_shift; /* Index into bundle->avail_chans */ 598 bool exclusive; /* T if conn is exclusive */ 599 bool upgrade; /* T if service ID can be upgraded */ 600 u16 orig_service_id; /* Originally requested service ID */ 601 short error; /* Local error code */ 602 }; 603 604 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp) 605 { 606 return sp->hdr.flags & RXRPC_CLIENT_INITIATED; 607 } 608 609 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp) 610 { 611 return !rxrpc_to_server(sp); 612 } 613 614 /* 615 * Flags in call->flags. 616 */ 617 enum rxrpc_call_flag { 618 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */ 619 RXRPC_CALL_HAS_USERID, /* has a user ID attached */ 620 RXRPC_CALL_IS_SERVICE, /* Call is service call */ 621 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */ 622 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */ 623 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */ 624 RXRPC_CALL_TX_ALL_ACKED, /* Last packet has been hard-acked */ 625 RXRPC_CALL_TX_NO_MORE, /* No more data to transmit (MSG_MORE deasserted) */ 626 RXRPC_CALL_SEND_PING, /* A ping will need to be sent */ 627 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */ 628 RXRPC_CALL_BEGAN_RX_TIMER, /* We began the expect_rx_by timer */ 629 RXRPC_CALL_RX_HEARD, /* The peer responded at least once to this call */ 630 RXRPC_CALL_DISCONNECTED, /* The call has been disconnected */ 631 RXRPC_CALL_KERNEL, /* The call was made by the kernel */ 632 RXRPC_CALL_UPGRADE, /* Service upgrade was requested for the call */ 633 RXRPC_CALL_EXCLUSIVE, /* The call uses a once-only connection */ 634 RXRPC_CALL_RX_IS_IDLE, /* recvmsg() is idle - send an ACK */ 635 RXRPC_CALL_RECVMSG_READ_ALL, /* recvmsg() read all of the received data */ 636 RXRPC_CALL_CONN_CHALLENGING, /* The connection is being challenged */ 637 }; 638 639 /* 640 * Events that can be raised on a call. 641 */ 642 enum rxrpc_call_event { 643 RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */ 644 RXRPC_CALL_EV_INITIAL_PING, /* Send initial ping for a new service call */ 645 }; 646 647 /* 648 * The states that a call can be in. 649 */ 650 enum rxrpc_call_state { 651 RXRPC_CALL_UNINITIALISED, 652 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */ 653 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */ 654 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */ 655 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */ 656 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */ 657 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */ 658 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */ 659 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */ 660 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */ 661 RXRPC_CALL_COMPLETE, /* - call complete */ 662 NR__RXRPC_CALL_STATES 663 }; 664 665 /* 666 * Call Tx congestion management modes. 667 */ 668 enum rxrpc_ca_state { 669 RXRPC_CA_SLOW_START, 670 RXRPC_CA_CONGEST_AVOIDANCE, 671 RXRPC_CA_PACKET_LOSS, 672 RXRPC_CA_FAST_RETRANSMIT, 673 NR__RXRPC_CA_STATES 674 } __mode(byte); 675 676 /* 677 * Current purpose of call RACK timer. According to the RACK-TLP protocol 678 * [RFC8985], the transmission timer (call->rack_timo_at) may only be used for 679 * one of these at once. 680 */ 681 enum rxrpc_rack_timer_mode { 682 RXRPC_CALL_RACKTIMER_OFF, /* Timer not running */ 683 RXRPC_CALL_RACKTIMER_RACK_REORDER, /* RACK reordering timer */ 684 RXRPC_CALL_RACKTIMER_TLP_PTO, /* TLP timeout */ 685 RXRPC_CALL_RACKTIMER_RTO, /* Retransmission timeout */ 686 } __mode(byte); 687 688 /* 689 * RxRPC call definition 690 * - matched by { connection, call_id } 691 */ 692 struct rxrpc_call { 693 struct rcu_head rcu; 694 struct rxrpc_connection *conn; /* connection carrying call */ 695 struct rxrpc_bundle *bundle; /* Connection bundle to use */ 696 struct rxrpc_peer *peer; /* Peer record for remote address */ 697 struct rxrpc_local *local; /* Representation of local endpoint */ 698 struct rxrpc_sock __rcu *socket; /* socket responsible */ 699 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ 700 struct key *key; /* Security details */ 701 const struct rxrpc_security *security; /* applied security module */ 702 struct mutex user_mutex; /* User access mutex */ 703 struct sockaddr_rxrpc dest_srx; /* Destination address */ 704 ktime_t delay_ack_at; /* When DELAY ACK needs to happen */ 705 ktime_t rack_timo_at; /* When ACK is figured as lost */ 706 ktime_t ping_at; /* When next to send a ping */ 707 ktime_t keepalive_at; /* When next to send a keepalive ping */ 708 ktime_t expect_rx_by; /* When we expect to get a packet by */ 709 ktime_t expect_req_by; /* When we expect to get a request DATA packet by */ 710 ktime_t expect_term_by; /* When we expect call termination by */ 711 u32 next_rx_timo; /* Timeout for next Rx packet (ms) */ 712 u32 next_req_timo; /* Timeout for next Rx request packet (ms) */ 713 u32 hard_timo; /* Maximum lifetime or 0 (s) */ 714 struct timer_list timer; /* Combined event timer */ 715 struct work_struct destroyer; /* In-process-context destroyer */ 716 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */ 717 struct list_head link; /* link in master call list */ 718 struct list_head wait_link; /* Link in local->new_client_calls */ 719 struct hlist_node error_link; /* link in error distribution list */ 720 struct list_head accept_link; /* Link in rx->acceptq */ 721 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */ 722 struct list_head sock_link; /* Link in rx->sock_calls */ 723 struct rb_node sock_node; /* Node in rx->calls */ 724 struct list_head attend_link; /* Link in local->call_attend_q */ 725 struct rxrpc_txbuf *tx_pending; /* Tx buffer being filled */ 726 wait_queue_head_t waitq; /* Wait queue for channel or Tx */ 727 s64 tx_total_len; /* Total length left to be transmitted (or -1) */ 728 unsigned long user_call_ID; /* user-defined call ID */ 729 unsigned long flags; 730 unsigned long events; 731 spinlock_t notify_lock; /* Kernel notification lock */ 732 unsigned int send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */ 733 s32 send_abort; /* Abort code to be sent */ 734 short send_abort_err; /* Error to be associated with the abort */ 735 rxrpc_seq_t send_abort_seq; /* DATA packet that incurred the abort (or 0) */ 736 s32 abort_code; /* Local/remote abort code */ 737 int error; /* Local error incurred */ 738 enum rxrpc_call_state _state; /* Current state of call (needs barrier) */ 739 enum rxrpc_call_completion completion; /* Call completion condition */ 740 refcount_t ref; 741 u8 security_ix; /* Security type */ 742 enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */ 743 u32 call_id; /* call ID on connection */ 744 u32 cid; /* connection ID plus channel index */ 745 u32 security_level; /* Security level selected */ 746 u32 security_enctype; /* Security-specific encoding type (or 0) */ 747 int debug_id; /* debug ID for printks */ 748 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */ 749 unsigned short rx_pkt_len; /* Current recvmsg packet len */ 750 751 /* Sendmsg data tracking. */ 752 rxrpc_seq_t send_top; /* Highest Tx slot filled by sendmsg. */ 753 struct rxrpc_txqueue *send_queue; /* Queue that sendmsg is writing into */ 754 755 /* Transmitted data tracking. */ 756 struct rxrpc_txqueue *tx_queue; /* Start of transmission buffers */ 757 struct rxrpc_txqueue *tx_qtail; /* End of transmission buffers */ 758 rxrpc_seq_t tx_qbase; /* First slot in tx_queue */ 759 rxrpc_seq_t tx_bottom; /* First packet in buffer */ 760 rxrpc_seq_t tx_transmitted; /* Highest packet transmitted */ 761 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */ 762 rxrpc_serial_t tx_last_serial; /* Serial of last DATA transmitted */ 763 u16 tx_backoff; /* Delay to insert due to Tx failure (ms) */ 764 u16 tx_nr_sent; /* Number of packets sent, but unacked */ 765 u16 tx_nr_lost; /* Number of packets marked lost */ 766 u16 tx_nr_resent; /* Number of packets resent, but unacked */ 767 u16 tx_winsize; /* Maximum size of Tx window */ 768 #define RXRPC_TX_MAX_WINDOW 128 769 u8 tx_jumbo_max; /* Maximum subpkts peer will accept */ 770 ktime_t tx_last_sent; /* Last time a transmission occurred */ 771 772 /* Received data tracking */ 773 struct sk_buff_head recvmsg_queue; /* Queue of packets ready for recvmsg() */ 774 struct sk_buff_head rx_queue; /* Queue of packets for this call to receive */ 775 struct sk_buff_head rx_oos_queue; /* Queue of out of sequence packets */ 776 void *rx_dec_buffer; /* Decryption buffer */ 777 unsigned short rx_dec_bsize; /* rx_dec_buffer size */ 778 unsigned short rx_dec_offset; /* Decrypted packet data offset */ 779 unsigned short rx_dec_len; /* Decrypted packet data len */ 780 rxrpc_seq_t rx_dec_seq; /* Packet in decryption buffer */ 781 782 rxrpc_seq_t rx_highest_seq; /* Higest sequence number received */ 783 rxrpc_seq_t rx_consumed; /* Highest packet consumed */ 784 rxrpc_serial_t rx_serial; /* Highest serial received for this call */ 785 u8 rx_winsize; /* Size of Rx window */ 786 787 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS 788 * is fixed, we keep these numbers in terms of segments (ie. DATA 789 * packets) rather than bytes. 790 */ 791 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN 792 #define RXRPC_MIN_CWND 4 793 enum rxrpc_ca_state cong_ca_state; /* Congestion control state */ 794 u8 cong_extra; /* Extra to send for congestion management */ 795 u16 cong_cwnd; /* Congestion window size */ 796 u16 cong_ssthresh; /* Slow-start threshold */ 797 u16 cong_dup_acks; /* Count of ACKs showing missing packets */ 798 u16 cong_cumul_acks; /* Cumulative ACK count */ 799 ktime_t cong_tstamp; /* Last time cwnd was changed */ 800 801 /* RACK-TLP [RFC8985] state. */ 802 ktime_t rack_xmit_ts; /* Latest transmission timestamp */ 803 ktime_t rack_rtt; /* RTT of most recently ACK'd segment */ 804 ktime_t rack_rtt_ts; /* Timestamp of rack_rtt */ 805 ktime_t rack_reo_wnd; /* Reordering window */ 806 unsigned int rack_reo_wnd_mult; /* Multiplier applied to rack_reo_wnd */ 807 int rack_reo_wnd_persist; /* Num loss recoveries before reset reo_wnd */ 808 rxrpc_seq_t rack_fack; /* Highest sequence so far ACK'd */ 809 rxrpc_seq_t rack_end_seq; /* Highest sequence seen */ 810 rxrpc_seq_t rack_dsack_round; /* DSACK opt recv'd in latest roundtrip */ 811 bool rack_dsack_round_none; /* T if dsack_round is "None" */ 812 bool rack_reordering_seen; /* T if detected reordering event */ 813 enum rxrpc_rack_timer_mode rack_timer_mode; /* Current mode of RACK timer */ 814 bool tlp_is_retrans; /* T if unacked TLP retransmission */ 815 rxrpc_serial_t tlp_serial; /* Serial of TLP probe (or 0 if none in progress) */ 816 rxrpc_seq_t tlp_seq; /* Sequence of TLP probe */ 817 unsigned int tlp_rtt_taken; /* Last time RTT taken */ 818 ktime_t tlp_max_ack_delay; /* Sender budget for max delayed ACK interval */ 819 820 /* Receive-phase ACK management (ACKs we send). */ 821 u8 ackr_reason; /* reason to ACK */ 822 u16 ackr_sack_base; /* Starting slot in SACK table ring */ 823 rxrpc_seq_t ackr_window; /* Base of SACK window */ 824 rxrpc_seq_t ackr_wtop; /* Base of SACK window */ 825 unsigned int ackr_nr_unacked; /* Number of unacked packets */ 826 atomic_t ackr_nr_consumed; /* Number of packets needing hard ACK */ 827 struct { 828 #define RXRPC_SACK_SIZE 256 829 /* SACK table for soft-acked packets */ 830 u8 ackr_sack_table[RXRPC_SACK_SIZE]; 831 } __aligned(8); 832 833 /* RTT management */ 834 rxrpc_serial_t rtt_serial[4]; /* Serial number of DATA or PING sent */ 835 ktime_t rtt_sent_at[4]; /* Time packet sent */ 836 unsigned long rtt_avail; /* Mask of available slots in bits 0-3, 837 * Mask of pending samples in 8-11 */ 838 #define RXRPC_CALL_RTT_AVAIL_MASK 0xf 839 #define RXRPC_CALL_RTT_PEND_SHIFT 8 840 841 /* Transmission-phase ACK management (ACKs we've received). */ 842 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */ 843 rxrpc_seq_t acks_hard_ack; /* Highest sequence hard acked */ 844 rxrpc_seq_t acks_prev_seq; /* Highest previousPacket received */ 845 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */ 846 rxrpc_serial_t acks_highest_serial; /* Highest serial number ACK'd */ 847 unsigned short acks_nr_sacks; /* Number of soft acks recorded */ 848 unsigned short acks_nr_snacks; /* Number of soft nacks recorded */ 849 850 /* Calculated RTT cache */ 851 ktime_t rtt_last_req; /* Time of last RTT request */ 852 unsigned int rtt_count; /* Number of samples we've got */ 853 unsigned int rtt_taken; /* Number of samples taken (wrapping) */ 854 struct minmax min_rtt; /* Estimated minimum RTT */ 855 u32 srtt_us; /* smoothed round trip time << 3 in usecs */ 856 u32 mdev_us; /* medium deviation */ 857 u32 mdev_max_us; /* maximal mdev for the last rtt period */ 858 u32 rttvar_us; /* smoothed mdev_max */ 859 u32 rto_us; /* Retransmission timeout in usec */ 860 u8 backoff; /* Backoff timeout (as shift) */ 861 }; 862 863 /* 864 * Summary of a new ACK and the changes it made to the Tx buffer packet states. 865 */ 866 struct rxrpc_ack_summary { 867 rxrpc_serial_t ack_serial; /* Serial number of ACK */ 868 rxrpc_serial_t acked_serial; /* Serial number ACK'd */ 869 u16 in_flight; /* Number of unreceived transmissions */ 870 u16 nr_new_hacks; /* Number of rotated new ACKs */ 871 u16 nr_new_sacks; /* Number of new soft ACKs in packet */ 872 u16 nr_new_snacks; /* Number of new soft nacks in packet */ 873 u8 ack_reason; 874 bool new_low_snack:1; /* T if new low soft NACK found */ 875 bool retrans_timeo:1; /* T if reTx due to timeout happened */ 876 bool need_retransmit:1; /* T if we need transmission */ 877 bool rtt_sample_avail:1; /* T if RTT sample available */ 878 bool in_fast_or_rto_recovery:1; 879 bool exiting_fast_or_rto_recovery:1; 880 bool tlp_probe_acked:1; /* T if the TLP probe seq was acked */ 881 u8 /*enum rxrpc_congest_change*/ change; 882 }; 883 884 /* 885 * sendmsg() cmsg-specified parameters. 886 */ 887 enum rxrpc_command { 888 RXRPC_CMD_SEND_DATA, /* send data message */ 889 RXRPC_CMD_SEND_ABORT, /* request abort generation */ 890 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */ 891 RXRPC_CMD_CHARGE_ACCEPT, /* [server] charge accept preallocation */ 892 }; 893 894 struct rxrpc_call_params { 895 s64 tx_total_len; /* Total Tx data length (if send data) */ 896 unsigned long user_call_ID; /* User's call ID */ 897 struct { 898 u32 hard; /* Maximum lifetime (sec) */ 899 u32 idle; /* Max time since last data packet (msec) */ 900 u32 normal; /* Max time since last call packet (msec) */ 901 } timeouts; 902 u8 nr_timeouts; /* Number of timeouts specified */ 903 bool kernel; /* T if kernel is making the call */ 904 enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */ 905 }; 906 907 struct rxrpc_send_params { 908 struct rxrpc_call_params call; 909 u32 abort_code; /* Abort code to Tx (if abort) */ 910 enum rxrpc_command command : 8; /* The command to implement */ 911 bool exclusive; /* Shared or exclusive call */ 912 bool upgrade; /* If the connection is upgradeable */ 913 }; 914 915 /* 916 * Buffer of data to be output as a packet. 917 */ 918 struct rxrpc_txbuf { 919 refcount_t ref; 920 rxrpc_seq_t seq; /* Sequence number of this packet */ 921 rxrpc_serial_t serial; /* Last serial number transmitted with */ 922 unsigned int call_debug_id; 923 unsigned int debug_id; 924 unsigned short len; /* Amount of data in buffer */ 925 unsigned short space; /* Remaining data space */ 926 unsigned short offset; /* Offset of fill point */ 927 unsigned short crypto_header; /* Size of crypto header */ 928 unsigned short sec_header; /* Size of security header */ 929 unsigned short pkt_len; /* Size of packet content */ 930 unsigned short alloc_size; /* Amount of bufferage allocated */ 931 unsigned int flags; 932 #define RXRPC_TXBUF_WIRE_FLAGS 0xff /* The wire protocol flags */ 933 #define RXRPC_TXBUF_RESENT 0x100 /* Set if has been resent */ 934 __be16 cksum; /* Checksum to go in header */ 935 bool jumboable; /* Can be non-terminal jumbo subpacket */ 936 void *data; /* Data with preceding jumbo header */ 937 }; 938 939 static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb) 940 { 941 return txb->flags & RXRPC_CLIENT_INITIATED; 942 } 943 944 static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb) 945 { 946 return !rxrpc_sending_to_server(txb); 947 } 948 949 /* 950 * Transmit queue element, including RACK [RFC8985] per-segment metadata. The 951 * transmission timestamp is in usec from the base. 952 */ 953 struct rxrpc_txqueue { 954 /* Start with the members we want to prefetch. */ 955 struct rxrpc_txqueue *next; 956 ktime_t xmit_ts_base; 957 rxrpc_seq_t qbase; 958 u8 nr_reported_acks; /* Number of segments explicitly acked/nacked */ 959 unsigned long segment_acked; /* Bit-per-buf: Set if ACK'd */ 960 unsigned long segment_lost; /* Bit-per-buf: Set if declared lost */ 961 unsigned long segment_retransmitted; /* Bit-per-buf: Set if retransmitted */ 962 unsigned long rtt_samples; /* Bit-per-buf: Set if available for RTT */ 963 unsigned long ever_retransmitted; /* Bit-per-buf: Set if ever retransmitted */ 964 965 /* The arrays we want to pack into as few cache lines as possible. */ 966 struct { 967 #define RXRPC_NR_TXQUEUE BITS_PER_LONG 968 #define RXRPC_TXQ_MASK (RXRPC_NR_TXQUEUE - 1) 969 struct rxrpc_txbuf *bufs[RXRPC_NR_TXQUEUE]; 970 unsigned int segment_serial[RXRPC_NR_TXQUEUE]; 971 unsigned int segment_xmit_ts[RXRPC_NR_TXQUEUE]; 972 } ____cacheline_aligned; 973 }; 974 975 /* 976 * Data transmission request. 977 */ 978 struct rxrpc_send_data_req { 979 ktime_t now; /* Current time */ 980 struct rxrpc_txqueue *tq; /* Tx queue segment holding first DATA */ 981 rxrpc_seq_t seq; /* Sequence of first data */ 982 int n; /* Number of DATA packets to glue into jumbo */ 983 bool retrans; /* T if this is a retransmission */ 984 bool did_send; /* T if did actually send */ 985 bool tlp_probe; /* T if this is a TLP probe */ 986 int /* enum rxrpc_txdata_trace */ trace; 987 }; 988 989 #include <trace/events/rxrpc.h> 990 991 /* 992 * Allocate the next serial number on a connection. 0 must be skipped. 993 */ 994 static inline rxrpc_serial_t rxrpc_get_next_serial(struct rxrpc_connection *conn) 995 { 996 rxrpc_serial_t serial; 997 998 serial = conn->tx_serial; 999 if (serial == 0) 1000 serial = 1; 1001 conn->tx_serial = serial + 1; 1002 return serial; 1003 } 1004 1005 /* 1006 * Allocate the next serial n numbers on a connection. 0 must be skipped. 1007 */ 1008 static inline rxrpc_serial_t rxrpc_get_next_serials(struct rxrpc_connection *conn, 1009 unsigned int n) 1010 { 1011 rxrpc_serial_t serial; 1012 1013 serial = conn->tx_serial; 1014 if (serial + n <= n) 1015 serial = 1; 1016 conn->tx_serial = serial + n; 1017 return serial; 1018 } 1019 1020 /* 1021 * af_rxrpc.c 1022 */ 1023 extern atomic_t rxrpc_n_rx_skbs; 1024 extern struct workqueue_struct *rxrpc_workqueue; 1025 1026 /* 1027 * call_accept.c 1028 */ 1029 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t); 1030 void rxrpc_discard_prealloc(struct rxrpc_sock *); 1031 bool rxrpc_new_incoming_call(struct rxrpc_local *local, 1032 struct rxrpc_peer *peer, 1033 struct rxrpc_connection *conn, 1034 struct sockaddr_rxrpc *peer_srx, 1035 struct sk_buff *skb); 1036 int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long); 1037 1038 /* 1039 * call_event.c 1040 */ 1041 void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial, 1042 enum rxrpc_propose_ack_trace why); 1043 void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t, 1044 enum rxrpc_propose_ack_trace); 1045 void rxrpc_resend_tlp(struct rxrpc_call *call); 1046 void rxrpc_transmit_some_data(struct rxrpc_call *call, unsigned int limit, 1047 enum rxrpc_txdata_trace trace); 1048 bool rxrpc_input_call_event(struct rxrpc_call *call); 1049 1050 /* 1051 * call_object.c 1052 */ 1053 extern const char *const rxrpc_call_states[]; 1054 extern const char *const rxrpc_call_completions[]; 1055 extern struct kmem_cache *rxrpc_call_jar; 1056 1057 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what); 1058 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long); 1059 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int); 1060 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *, 1061 struct rxrpc_conn_parameters *, 1062 struct rxrpc_call_params *, gfp_t, 1063 unsigned int) 1064 __releases(&rx->sk.sk_lock) 1065 __acquires(&call->user_mutex); 1066 void rxrpc_start_call_timer(struct rxrpc_call *call); 1067 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *, 1068 struct sk_buff *); 1069 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *); 1070 void rxrpc_release_calls_on_socket(struct rxrpc_sock *); 1071 void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace); 1072 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 1073 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 1074 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace); 1075 void rxrpc_cleanup_call(struct rxrpc_call *); 1076 void rxrpc_destroy_all_calls(struct rxrpc_net *); 1077 1078 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call) 1079 { 1080 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags); 1081 } 1082 1083 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call) 1084 { 1085 return !rxrpc_is_service_call(call); 1086 } 1087 1088 /* 1089 * call_state.c 1090 */ 1091 bool rxrpc_set_call_completion(struct rxrpc_call *call, 1092 enum rxrpc_call_completion compl, 1093 u32 abort_code, 1094 int error); 1095 bool rxrpc_call_completed(struct rxrpc_call *call); 1096 bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq, 1097 u32 abort_code, int error, enum rxrpc_abort_reason why); 1098 void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl, 1099 int error); 1100 1101 static inline void rxrpc_set_call_state(struct rxrpc_call *call, 1102 enum rxrpc_call_state state) 1103 { 1104 /* Order write of completion info before write of ->state. */ 1105 smp_store_release(&call->_state, state); 1106 wake_up(&call->waitq); 1107 } 1108 1109 static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call) 1110 { 1111 return call->_state; /* Only inside I/O thread */ 1112 } 1113 1114 static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call) 1115 { 1116 return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; 1117 } 1118 1119 static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call) 1120 { 1121 /* Order read ->state before read of completion info. */ 1122 return smp_load_acquire(&call->_state); 1123 } 1124 1125 static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call) 1126 { 1127 return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; 1128 } 1129 1130 static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call) 1131 { 1132 return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED; 1133 } 1134 1135 /* 1136 * conn_client.c 1137 */ 1138 extern unsigned int rxrpc_reap_client_connections; 1139 extern unsigned long rxrpc_conn_idle_client_expiry; 1140 extern unsigned long rxrpc_conn_idle_client_fast_expiry; 1141 1142 void rxrpc_purge_client_connections(struct rxrpc_local *local); 1143 struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 1144 void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 1145 int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp); 1146 void rxrpc_connect_client_calls(struct rxrpc_local *local); 1147 void rxrpc_expose_client_call(struct rxrpc_call *); 1148 void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *); 1149 void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle); 1150 void rxrpc_discard_expired_client_conns(struct rxrpc_local *local); 1151 void rxrpc_clean_up_local_conns(struct rxrpc_local *); 1152 1153 /* 1154 * conn_event.c 1155 */ 1156 void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb, 1157 unsigned int channel); 1158 int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb, 1159 s32 abort_code, int err, enum rxrpc_abort_reason why); 1160 void rxrpc_process_connection(struct work_struct *); 1161 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool); 1162 bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb); 1163 void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb); 1164 1165 static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn) 1166 { 1167 /* Order reading the abort info after the state check. */ 1168 return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED; 1169 } 1170 1171 /* 1172 * conn_object.c 1173 */ 1174 extern unsigned int rxrpc_connection_expiry; 1175 extern unsigned int rxrpc_closed_conn_expiry; 1176 1177 void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why); 1178 struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t); 1179 struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *, 1180 struct sockaddr_rxrpc *, 1181 struct sk_buff *); 1182 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *); 1183 void rxrpc_disconnect_call(struct rxrpc_call *); 1184 void rxrpc_kill_client_conn(struct rxrpc_connection *); 1185 void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace); 1186 void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 1187 struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *, 1188 enum rxrpc_conn_trace); 1189 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *, 1190 enum rxrpc_conn_trace); 1191 void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 1192 void rxrpc_service_connection_reaper(struct work_struct *); 1193 void rxrpc_destroy_all_connections(struct rxrpc_net *); 1194 1195 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn) 1196 { 1197 return conn->out_clientflag; 1198 } 1199 1200 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn) 1201 { 1202 return !rxrpc_conn_is_client(conn); 1203 } 1204 1205 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn, 1206 unsigned long expire_at) 1207 { 1208 timer_reduce(&conn->timer, expire_at); 1209 } 1210 1211 /* 1212 * conn_service.c 1213 */ 1214 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *, 1215 struct sk_buff *); 1216 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t); 1217 void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *, 1218 const struct rxrpc_security *, struct sk_buff *); 1219 void rxrpc_unpublish_service_conn(struct rxrpc_connection *); 1220 1221 /* 1222 * input.c 1223 */ 1224 void rxrpc_congestion_degrade(struct rxrpc_call *); 1225 void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *); 1226 void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *); 1227 1228 /* 1229 * input_rack.c 1230 */ 1231 void rxrpc_input_rack_one(struct rxrpc_call *call, 1232 struct rxrpc_ack_summary *summary, 1233 struct rxrpc_txqueue *tq, 1234 unsigned int ix); 1235 void rxrpc_input_rack(struct rxrpc_call *call, 1236 struct rxrpc_ack_summary *summary, 1237 struct rxrpc_txqueue *tq, 1238 unsigned long new_acks); 1239 void rxrpc_rack_detect_loss_and_arm_timer(struct rxrpc_call *call, 1240 struct rxrpc_ack_summary *summary); 1241 ktime_t rxrpc_tlp_calc_pto(struct rxrpc_call *call, ktime_t now); 1242 void rxrpc_tlp_send_probe(struct rxrpc_call *call); 1243 void rxrpc_tlp_process_ack(struct rxrpc_call *call, struct rxrpc_ack_summary *summary); 1244 void rxrpc_rack_timer_expired(struct rxrpc_call *call, ktime_t overran_by); 1245 1246 /* Initialise TLP state [RFC8958 7.1]. */ 1247 static inline void rxrpc_tlp_init(struct rxrpc_call *call) 1248 { 1249 call->tlp_serial = 0; 1250 call->tlp_seq = call->acks_hard_ack; 1251 call->tlp_is_retrans = false; 1252 } 1253 1254 /* 1255 * io_thread.c 1256 */ 1257 int rxrpc_encap_rcv(struct sock *, struct sk_buff *); 1258 void rxrpc_error_report(struct sock *); 1259 bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why, 1260 s32 abort_code, int err); 1261 bool rxrpc_direct_conn_abort(struct sk_buff *skb, enum rxrpc_abort_reason why, 1262 s32 abort_code, int err); 1263 int rxrpc_io_thread(void *data); 1264 void rxrpc_post_response(struct rxrpc_connection *conn, struct sk_buff *skb); 1265 static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local) 1266 { 1267 if (!local->io_thread) 1268 return; 1269 wake_up_process(READ_ONCE(local->io_thread)); 1270 } 1271 1272 static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why) 1273 { 1274 return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO); 1275 } 1276 1277 /* 1278 * insecure.c 1279 */ 1280 extern const struct rxrpc_security rxrpc_no_security; 1281 1282 /* 1283 * key.c 1284 */ 1285 extern struct key_type key_type_rxrpc; 1286 1287 int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int); 1288 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t, 1289 u32); 1290 1291 /* 1292 * local_event.c 1293 */ 1294 void rxrpc_gen_version_string(void); 1295 void rxrpc_send_version_request(struct rxrpc_local *local, 1296 struct rxrpc_host_header *hdr, 1297 struct sk_buff *skb); 1298 1299 /* 1300 * local_object.c 1301 */ 1302 void rxrpc_local_dont_fragment(const struct rxrpc_local *local, bool set); 1303 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *); 1304 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace); 1305 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace); 1306 void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace); 1307 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace); 1308 void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace); 1309 void rxrpc_destroy_local(struct rxrpc_local *local); 1310 void rxrpc_destroy_all_locals(struct rxrpc_net *); 1311 1312 static inline bool __rxrpc_use_local(struct rxrpc_local *local, 1313 enum rxrpc_local_trace why) 1314 { 1315 int r, u; 1316 1317 r = refcount_read(&local->ref); 1318 u = atomic_fetch_add_unless(&local->active_users, 1, 0); 1319 trace_rxrpc_local(local->debug_id, why, r, u); 1320 return u != 0; 1321 } 1322 1323 static inline void rxrpc_see_local(struct rxrpc_local *local, 1324 enum rxrpc_local_trace why) 1325 { 1326 int r, u; 1327 1328 r = refcount_read(&local->ref); 1329 u = atomic_read(&local->active_users); 1330 trace_rxrpc_local(local->debug_id, why, r, u); 1331 } 1332 1333 /* 1334 * misc.c 1335 */ 1336 extern unsigned int rxrpc_max_backlog __read_mostly; 1337 extern unsigned long rxrpc_soft_ack_delay; 1338 extern unsigned long rxrpc_idle_ack_delay; 1339 extern unsigned int rxrpc_rx_window_size; 1340 extern unsigned int rxrpc_rx_mtu; 1341 extern unsigned int rxrpc_rx_jumbo_max; 1342 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY 1343 extern unsigned long rxrpc_inject_rx_delay; 1344 #endif 1345 1346 /* 1347 * net_ns.c 1348 */ 1349 extern unsigned int rxrpc_net_id; 1350 extern struct pernet_operations rxrpc_net_ops; 1351 1352 static inline struct rxrpc_net *rxrpc_net(struct net *net) 1353 { 1354 return net_generic(net, rxrpc_net_id); 1355 } 1356 1357 /* 1358 * out_of_band.c 1359 */ 1360 void rxrpc_notify_socket_oob(struct rxrpc_call *call, struct sk_buff *skb); 1361 void rxrpc_add_pending_oob(struct rxrpc_sock *rx, struct sk_buff *skb); 1362 int rxrpc_sendmsg_oob(struct rxrpc_sock *rx, struct msghdr *msg, size_t len); 1363 1364 /* 1365 * output.c 1366 */ 1367 ssize_t do_udp_sendmsg(struct socket *socket, struct msghdr *msg, size_t len); 1368 void rxrpc_send_ACK(struct rxrpc_call *call, u8 ack_reason, 1369 rxrpc_serial_t serial, enum rxrpc_propose_ack_trace why); 1370 void rxrpc_send_probe_for_pmtud(struct rxrpc_call *call); 1371 int rxrpc_send_abort_packet(struct rxrpc_call *); 1372 void rxrpc_send_data_packet(struct rxrpc_call *call, struct rxrpc_send_data_req *req); 1373 void rxrpc_send_conn_abort(struct rxrpc_connection *conn); 1374 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb); 1375 void rxrpc_send_keepalive(struct rxrpc_peer *); 1376 void rxrpc_send_response(struct rxrpc_connection *conn, struct sk_buff *skb); 1377 1378 /* 1379 * peer_event.c 1380 */ 1381 void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *); 1382 void rxrpc_peer_keepalive_worker(struct work_struct *); 1383 void rxrpc_input_probe_for_pmtud(struct rxrpc_connection *conn, rxrpc_serial_t acked_serial, 1384 bool sendmsg_fail); 1385 1386 /* Update the last transmission time on a peer for keepalive purposes. */ 1387 static inline void rxrpc_peer_mark_tx(struct rxrpc_peer *peer) 1388 { 1389 /* To avoid tearing on 32-bit systems, we only keep the LSW. */ 1390 WRITE_ONCE(peer->last_tx_at, ktime_get_seconds()); 1391 } 1392 1393 /* 1394 * peer_object.c 1395 */ 1396 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *, 1397 const struct sockaddr_rxrpc *); 1398 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local, 1399 struct sockaddr_rxrpc *srx, gfp_t gfp); 1400 void rxrpc_assess_MTU_size(struct rxrpc_local *local, struct rxrpc_peer *peer); 1401 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t, 1402 enum rxrpc_peer_trace); 1403 void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer); 1404 void rxrpc_destroy_all_peers(struct rxrpc_net *); 1405 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1406 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace); 1407 void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1408 1409 /* 1410 * proc.c 1411 */ 1412 extern const struct seq_operations rxrpc_call_seq_ops; 1413 extern const struct seq_operations rxrpc_connection_seq_ops; 1414 extern const struct seq_operations rxrpc_bundle_seq_ops; 1415 extern const struct seq_operations rxrpc_peer_seq_ops; 1416 extern const struct seq_operations rxrpc_local_seq_ops; 1417 1418 /* 1419 * recvmsg.c 1420 */ 1421 void rxrpc_notify_socket(struct rxrpc_call *); 1422 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int); 1423 1424 /* 1425 * Abort a call due to a protocol error. 1426 */ 1427 static inline int rxrpc_abort_eproto(struct rxrpc_call *call, 1428 struct sk_buff *skb, 1429 s32 abort_code, 1430 enum rxrpc_abort_reason why) 1431 { 1432 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 1433 1434 rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why); 1435 return -EPROTO; 1436 } 1437 1438 /* 1439 * rtt.c 1440 */ 1441 void rxrpc_call_add_rtt(struct rxrpc_call *call, enum rxrpc_rtt_rx_trace why, 1442 int rtt_slot, 1443 rxrpc_serial_t send_serial, rxrpc_serial_t resp_serial, 1444 ktime_t send_time, ktime_t resp_time); 1445 ktime_t rxrpc_get_rto_backoff(struct rxrpc_call *call, bool retrans); 1446 void rxrpc_call_init_rtt(struct rxrpc_call *call); 1447 1448 /* 1449 * rxgk.c 1450 */ 1451 extern const struct rxrpc_security rxgk_yfs; 1452 1453 /* 1454 * rxkad.c 1455 */ 1456 #ifdef CONFIG_RXKAD 1457 extern const struct rxrpc_security rxkad; 1458 #endif 1459 1460 /* 1461 * security.c 1462 */ 1463 int __init rxrpc_init_security(void); 1464 const struct rxrpc_security *rxrpc_security_lookup(u8); 1465 void rxrpc_exit_security(void); 1466 int rxrpc_init_client_call_security(struct rxrpc_call *); 1467 int rxrpc_init_client_conn_security(struct rxrpc_connection *); 1468 const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *, 1469 struct sk_buff *); 1470 struct key *rxrpc_look_up_server_security(struct rxrpc_connection *, 1471 struct sk_buff *, u32, u32); 1472 1473 /* 1474 * sendmsg.c 1475 */ 1476 bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error, 1477 enum rxrpc_abort_reason why); 1478 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t); 1479 1480 /* 1481 * server_key.c 1482 */ 1483 extern struct key_type key_type_rxrpc_s; 1484 1485 int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int); 1486 1487 /* 1488 * skbuff.c 1489 */ 1490 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *); 1491 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace); 1492 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace); 1493 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace); 1494 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace); 1495 void rxrpc_purge_queue(struct sk_buff_head *); 1496 1497 /* 1498 * stats.c 1499 */ 1500 int rxrpc_stats_show(struct seq_file *seq, void *v); 1501 int rxrpc_stats_clear(struct file *file, char *buf, size_t size); 1502 1503 #define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s) 1504 #define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s) 1505 1506 /* 1507 * sysctl.c 1508 */ 1509 #ifdef CONFIG_SYSCTL 1510 extern int __init rxrpc_sysctl_init(void); 1511 extern void rxrpc_sysctl_exit(void); 1512 #else 1513 static inline int __init rxrpc_sysctl_init(void) { return 0; } 1514 static inline void rxrpc_sysctl_exit(void) {} 1515 #endif 1516 1517 /* 1518 * txbuf.c 1519 */ 1520 extern atomic_t rxrpc_nr_txbuf; 1521 struct rxrpc_txbuf *rxrpc_alloc_data_txbuf(struct rxrpc_call *call, size_t data_size, 1522 size_t data_align, gfp_t gfp); 1523 void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1524 void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1525 1526 /* 1527 * utils.c 1528 */ 1529 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *); 1530 1531 static inline bool before(u32 seq1, u32 seq2) 1532 { 1533 return (s32)(seq1 - seq2) < 0; 1534 } 1535 static inline bool before_eq(u32 seq1, u32 seq2) 1536 { 1537 return (s32)(seq1 - seq2) <= 0; 1538 } 1539 static inline bool after(u32 seq1, u32 seq2) 1540 { 1541 return (s32)(seq1 - seq2) > 0; 1542 } 1543 static inline bool after_eq(u32 seq1, u32 seq2) 1544 { 1545 return (s32)(seq1 - seq2) >= 0; 1546 } 1547 1548 static inline u32 earliest(u32 seq1, u32 seq2) 1549 { 1550 return before(seq1, seq2) ? seq1 : seq2; 1551 } 1552 1553 static inline u32 latest(u32 seq1, u32 seq2) 1554 { 1555 return after(seq1, seq2) ? seq1 : seq2; 1556 } 1557 1558 static inline bool rxrpc_seq_in_txq(const struct rxrpc_txqueue *tq, rxrpc_seq_t seq) 1559 { 1560 return (seq & (RXRPC_NR_TXQUEUE - 1)) == tq->qbase; 1561 } 1562 1563 static inline void rxrpc_queue_rx_call_packet(struct rxrpc_call *call, struct sk_buff *skb) 1564 { 1565 rxrpc_get_skb(skb, rxrpc_skb_get_call_rx); 1566 __skb_queue_tail(&call->rx_queue, skb); 1567 rxrpc_poke_call(call, rxrpc_call_poke_rx_packet); 1568 } 1569 1570 /* 1571 * Calculate how much space there is for transmitting more DATA packets. 1572 */ 1573 static inline unsigned int rxrpc_tx_window_space(const struct rxrpc_call *call) 1574 { 1575 int winsize = umin(call->tx_winsize, call->cong_cwnd + call->cong_extra); 1576 int transmitted = call->tx_top - call->tx_bottom; 1577 1578 return max(winsize - transmitted, 0); 1579 } 1580 1581 static inline unsigned int rxrpc_left_out(const struct rxrpc_call *call) 1582 { 1583 return call->acks_nr_sacks + call->tx_nr_lost; 1584 } 1585 1586 /* 1587 * Calculate the number of transmitted DATA packets assumed to be in flight 1588 * [approx RFC6675]. 1589 */ 1590 static inline unsigned int rxrpc_tx_in_flight(const struct rxrpc_call *call) 1591 { 1592 return call->tx_nr_sent - rxrpc_left_out(call) + call->tx_nr_resent; 1593 } 1594 1595 /* 1596 * debug tracing 1597 */ 1598 extern unsigned int rxrpc_debug; 1599 1600 #define dbgprintk(FMT,...) \ 1601 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1602 1603 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1604 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1605 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1606 1607 1608 #if defined(__KDEBUG) 1609 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1610 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1611 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1612 1613 #elif defined(CONFIG_AF_RXRPC_DEBUG) 1614 #define RXRPC_DEBUG_KENTER 0x01 1615 #define RXRPC_DEBUG_KLEAVE 0x02 1616 #define RXRPC_DEBUG_KDEBUG 0x04 1617 1618 #define _enter(FMT,...) \ 1619 do { \ 1620 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \ 1621 kenter(FMT,##__VA_ARGS__); \ 1622 } while (0) 1623 1624 #define _leave(FMT,...) \ 1625 do { \ 1626 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \ 1627 kleave(FMT,##__VA_ARGS__); \ 1628 } while (0) 1629 1630 #define _debug(FMT,...) \ 1631 do { \ 1632 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \ 1633 kdebug(FMT,##__VA_ARGS__); \ 1634 } while (0) 1635 1636 #else 1637 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1638 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1639 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1640 #endif 1641 1642 /* 1643 * debug assertion checking 1644 */ 1645 #if 1 // defined(__KDEBUGALL) 1646 1647 #define ASSERT(X) \ 1648 do { \ 1649 if (unlikely(!(X))) { \ 1650 pr_err("Assertion failed\n"); \ 1651 BUG(); \ 1652 } \ 1653 } while (0) 1654 1655 #define ASSERTCMP(X, OP, Y) \ 1656 do { \ 1657 __typeof__(X) _x = (X); \ 1658 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1659 if (unlikely(!(_x OP _y))) { \ 1660 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1661 (unsigned long)_x, (unsigned long)_x, #OP, \ 1662 (unsigned long)_y, (unsigned long)_y); \ 1663 BUG(); \ 1664 } \ 1665 } while (0) 1666 1667 #define ASSERTIF(C, X) \ 1668 do { \ 1669 if (unlikely((C) && !(X))) { \ 1670 pr_err("Assertion failed\n"); \ 1671 BUG(); \ 1672 } \ 1673 } while (0) 1674 1675 #define ASSERTIFCMP(C, X, OP, Y) \ 1676 do { \ 1677 __typeof__(X) _x = (X); \ 1678 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1679 if (unlikely((C) && !(_x OP _y))) { \ 1680 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1681 (unsigned long)_x, (unsigned long)_x, #OP, \ 1682 (unsigned long)_y, (unsigned long)_y); \ 1683 BUG(); \ 1684 } \ 1685 } while (0) 1686 1687 #else 1688 1689 #define ASSERT(X) \ 1690 do { \ 1691 } while (0) 1692 1693 #define ASSERTCMP(X, OP, Y) \ 1694 do { \ 1695 } while (0) 1696 1697 #define ASSERTIF(C, X) \ 1698 do { \ 1699 } while (0) 1700 1701 #define ASSERTIFCMP(C, X, OP, Y) \ 1702 do { \ 1703 } while (0) 1704 1705 #endif /* __KDEBUGALL */ 1706