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_ROUNDS 16 19 20 struct fcrypt_key { 21 __be32 sched[FCRYPT_ROUNDS]; 22 }; 23 24 #define FCRYPT_BSIZE 8 25 struct rxrpc_crypt { 26 union { 27 u8 x[FCRYPT_BSIZE]; 28 __be32 n[2]; 29 }; 30 } __attribute__((aligned(8))); 31 32 void fcrypt_preparekey(struct fcrypt_key *key, const u8 raw_key[FCRYPT_BSIZE]); 33 void fcrypt_pcbc_encrypt(const struct fcrypt_key *key, 34 const u8 iv[FCRYPT_BSIZE], const void *src, void *dst, 35 size_t nblocks); 36 void fcrypt_pcbc_decrypt(const struct fcrypt_key *key, 37 const u8 iv[FCRYPT_BSIZE], const void *src, void *dst, 38 size_t nblocks); 39 #if IS_ENABLED(CONFIG_KUNIT) 40 struct des_ctx; 41 void des_pcbc_decrypt_inplace(const struct des_ctx *key, __le64 iv, u8 *data, 42 size_t len); 43 #endif 44 45 #define rxrpc_queue_work(WS) queue_work(rxrpc_workqueue, (WS)) 46 #define rxrpc_queue_delayed_work(WS,D) \ 47 queue_delayed_work(rxrpc_workqueue, (WS), (D)) 48 49 struct key_preparsed_payload; 50 struct rxrpc_connection; 51 struct rxrpc_txbuf; 52 struct rxrpc_txqueue; 53 struct rxgk_context; 54 55 /* 56 * Mark applied to socket buffers in skb->mark. skb->priority is used 57 * to pass supplementary information. 58 */ 59 enum rxrpc_skb_mark { 60 RXRPC_SKB_MARK_PACKET, /* Received packet */ 61 RXRPC_SKB_MARK_ERROR, /* Error notification */ 62 RXRPC_SKB_MARK_CHALLENGE, /* Challenge notification */ 63 RXRPC_SKB_MARK_SERVICE_CONN_SECURED, /* Service connection response has been verified */ 64 RXRPC_SKB_MARK_REJECT_BUSY, /* Reject with BUSY */ 65 RXRPC_SKB_MARK_REJECT_ABORT, /* Reject with ABORT (code in skb->priority) */ 66 RXRPC_SKB_MARK_REJECT_CONN_ABORT, /* Reject with connection ABORT (code in skb->priority) */ 67 }; 68 69 /* 70 * sk_state for RxRPC sockets 71 */ 72 enum { 73 RXRPC_UNBOUND = 0, 74 RXRPC_CLIENT_UNBOUND, /* Unbound socket used as client */ 75 RXRPC_CLIENT_BOUND, /* client local address bound */ 76 RXRPC_SERVER_BOUND, /* server local address bound */ 77 RXRPC_SERVER_BOUND2, /* second server local address bound */ 78 RXRPC_SERVER_LISTENING, /* server listening for connections */ 79 RXRPC_SERVER_LISTEN_DISABLED, /* server listening disabled */ 80 RXRPC_CLOSE, /* socket is being closed */ 81 }; 82 83 /* 84 * Per-network namespace data. 85 */ 86 struct rxrpc_net { 87 struct proc_dir_entry *proc_net; /* Subdir in /proc/net */ 88 u32 epoch; /* Local epoch for detecting local-end reset */ 89 struct list_head calls; /* List of calls active in this namespace */ 90 spinlock_t call_lock; /* Lock for ->calls */ 91 atomic_t nr_calls; /* Count of allocated calls */ 92 93 atomic_t nr_conns; 94 struct list_head bundle_proc_list; /* List of bundles for proc */ 95 struct list_head conn_proc_list; /* List of conns in this namespace for proc */ 96 struct list_head service_conns; /* Service conns in this namespace */ 97 rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */ 98 struct work_struct service_conn_reaper; 99 struct timer_list service_conn_reap_timer; 100 101 bool live; 102 103 atomic_t nr_client_conns; 104 105 struct hlist_head local_endpoints; 106 struct mutex local_mutex; /* Lock for ->local_endpoints */ 107 108 DECLARE_HASHTABLE (peer_hash, 10); 109 spinlock_t peer_hash_lock; /* Lock for ->peer_hash */ 110 111 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */ 112 u8 peer_keepalive_cursor; 113 time64_t peer_keepalive_base; 114 struct list_head peer_keepalive[32]; 115 struct list_head peer_keepalive_new; 116 struct timer_list peer_keepalive_timer; 117 struct work_struct peer_keepalive_work; 118 119 atomic_t stat_tx_data; 120 atomic_t stat_tx_data_retrans; 121 atomic_t stat_tx_data_send; 122 atomic_t stat_tx_data_send_frag; 123 atomic_t stat_tx_data_send_fail; 124 atomic_t stat_tx_data_send_msgsize; 125 atomic_t stat_tx_data_underflow; 126 atomic_t stat_tx_data_cwnd_reset; 127 atomic_t stat_rx_data; 128 atomic_t stat_rx_data_reqack; 129 atomic_t stat_rx_data_jumbo; 130 131 atomic_t stat_tx_ack_fill; 132 atomic_t stat_tx_ack_send; 133 atomic_t stat_tx_ack_skip; 134 atomic_t stat_tx_acks[256]; 135 atomic_t stat_rx_acks[256]; 136 atomic_t stat_tx_jumbo[10]; 137 atomic_t stat_rx_jumbo[10]; 138 139 atomic_t stat_why_req_ack[9]; 140 141 atomic_t stat_io_loop; 142 }; 143 144 /* 145 * Service backlog preallocation. 146 * 147 * This contains circular buffers of preallocated peers, connections and calls 148 * for incoming service calls and their head and tail pointers. This allows 149 * calls to be set up in the data_ready handler, thereby avoiding the need to 150 * shuffle packets around so much. 151 */ 152 struct rxrpc_backlog { 153 unsigned short peer_backlog_head; 154 unsigned short peer_backlog_tail; 155 unsigned short conn_backlog_head; 156 unsigned short conn_backlog_tail; 157 unsigned short call_backlog_head; 158 unsigned short call_backlog_tail; 159 #define RXRPC_BACKLOG_MAX 32 160 struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX]; 161 struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX]; 162 struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX]; 163 }; 164 165 /* 166 * RxRPC socket definition 167 */ 168 struct rxrpc_sock { 169 /* WARNING: sk has to be the first member */ 170 struct sock sk; 171 const struct rxrpc_kernel_ops *app_ops; /* Table of kernel app notification funcs */ 172 struct rxrpc_local *local; /* local endpoint */ 173 struct rxrpc_backlog *backlog; /* Preallocation for services */ 174 struct sk_buff_head recvmsg_oobq; /* OOB messages for recvmsg to pick up */ 175 struct rb_root pending_oobq; /* OOB messages awaiting userspace to respond to */ 176 u64 oob_id_counter; /* OOB message ID counter */ 177 spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */ 178 struct list_head sock_calls; /* List of calls owned by this socket */ 179 struct list_head to_be_accepted; /* calls awaiting acceptance */ 180 struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */ 181 spinlock_t recvmsg_lock; /* Lock for recvmsg_q */ 182 struct key *key; /* security for this socket */ 183 struct key *securities; /* list of server security descriptors */ 184 struct rb_root calls; /* User ID -> call mapping */ 185 unsigned long flags; 186 #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */ 187 #define RXRPC_SOCK_MANAGE_RESPONSE 1 /* User wants to manage RESPONSE packets */ 188 rwlock_t call_lock; /* lock for calls */ 189 u32 min_sec_level; /* minimum security level */ 190 #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT 191 bool exclusive; /* Exclusive connection for a client socket */ 192 u16 second_service; /* Additional service bound to the endpoint */ 193 struct { 194 /* Service upgrade information */ 195 u16 from; /* Service ID to upgrade (if not 0) */ 196 u16 to; /* service ID to upgrade to */ 197 } service_upgrade; 198 sa_family_t family; /* Protocol family created with */ 199 struct sockaddr_rxrpc srx; /* Primary Service/local addresses */ 200 struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */ 201 }; 202 203 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk) 204 205 /* 206 * CPU-byteorder normalised Rx packet header. 207 */ 208 struct rxrpc_host_header { 209 u32 epoch; /* client boot timestamp */ 210 u32 cid; /* connection and channel ID */ 211 u32 callNumber; /* call ID (0 for connection-level packets) */ 212 u32 seq; /* sequence number of pkt in call stream */ 213 u32 serial; /* serial number of pkt sent to network */ 214 u8 type; /* packet type */ 215 u8 flags; /* packet flags */ 216 u8 userStatus; /* app-layer defined status */ 217 u8 securityIndex; /* security protocol ID */ 218 union { 219 u16 _rsvd; /* reserved */ 220 u16 cksum; /* kerberos security checksum */ 221 }; 222 u16 serviceId; /* service ID */ 223 } __packed; 224 225 /* 226 * RxRPC socket buffer private variables 227 * - max 48 bytes (struct sk_buff::cb) 228 */ 229 struct rxrpc_skb_priv { 230 union { 231 struct rxrpc_connection *poke_conn; /* Conn referred to (poke packet) */ 232 struct { 233 u16 offset; /* Offset of data */ 234 u16 len; /* Length of data */ 235 }; 236 struct { 237 rxrpc_seq_t first_ack; /* First packet in acks table */ 238 rxrpc_seq_t prev_ack; /* Highest seq seen */ 239 rxrpc_serial_t acked_serial; /* Packet in response to (or 0) */ 240 u16 nr_acks; /* Number of acks+nacks */ 241 u8 reason; /* Reason for ack */ 242 } ack; 243 struct { 244 struct rxrpc_connection *conn; /* Connection referred to */ 245 union { 246 u32 rxkad_nonce; 247 }; 248 } chall; 249 struct { 250 rxrpc_serial_t challenge_serial; 251 u32 kvno; 252 u32 version; 253 u16 len; 254 u16 ticket_len; 255 } resp; 256 }; 257 struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */ 258 }; 259 260 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb) 261 262 /* 263 * RxRPC security module interface 264 */ 265 struct rxrpc_security { 266 const char *name; /* name of this service */ 267 u8 security_index; /* security type provided */ 268 u32 no_key_abort; /* Abort code indicating no key */ 269 270 /* Initialise a security service */ 271 int (*init)(void); 272 273 /* Clean up a security service */ 274 void (*exit)(void); 275 276 /* Parse the information from a server key */ 277 int (*preparse_server_key)(struct key_preparsed_payload *); 278 279 /* Clean up the preparse buffer after parsing a server key */ 280 void (*free_preparse_server_key)(struct key_preparsed_payload *); 281 282 /* Destroy the payload of a server key */ 283 void (*destroy_server_key)(struct key *); 284 285 /* Describe a server key */ 286 void (*describe_server_key)(const struct key *, struct seq_file *); 287 288 /* initialise a connection's security */ 289 int (*init_connection_security)(struct rxrpc_connection *, 290 struct rxrpc_key_token *); 291 292 /* Work out how much data we can store in a packet, given an estimate 293 * of the amount of data remaining and allocate a data buffer. 294 */ 295 struct rxrpc_txbuf *(*alloc_txbuf)(struct rxrpc_call *call, size_t remaining, gfp_t gfp); 296 297 /* impose security on a packet */ 298 int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *); 299 300 /* verify the security on a received packet */ 301 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *); 302 303 /* Free crypto request on a call */ 304 void (*free_call_crypto)(struct rxrpc_call *); 305 306 /* issue a challenge */ 307 int (*issue_challenge)(struct rxrpc_connection *); 308 309 /* Validate a challenge packet */ 310 bool (*validate_challenge)(struct rxrpc_connection *conn, 311 struct sk_buff *skb); 312 313 /* Fill out the cmsg for recvmsg() to pass on a challenge to userspace. 314 * The security class gets to add additional information. 315 */ 316 int (*challenge_to_recvmsg)(struct rxrpc_connection *conn, 317 struct sk_buff *challenge, 318 struct msghdr *msg); 319 320 /* Parse sendmsg() control message and respond to challenge. */ 321 int (*sendmsg_respond_to_challenge)(struct sk_buff *challenge, 322 struct msghdr *msg); 323 324 /* respond to a challenge */ 325 int (*respond_to_challenge)(struct rxrpc_connection *conn, 326 struct sk_buff *challenge); 327 328 /* verify a response */ 329 int (*verify_response)(struct rxrpc_connection *conn, 330 struct sk_buff *response_skb, 331 void *response, unsigned int len); 332 333 /* clear connection security */ 334 void (*clear)(struct rxrpc_connection *); 335 336 /* Default ticket -> key decoder */ 337 int (*default_decode_ticket)(struct rxrpc_connection *conn, struct sk_buff *skb, 338 void *ticket, unsigned int ticket_len, 339 struct key **_key); 340 }; 341 342 /* 343 * RxRPC local transport endpoint description 344 * - owned by a single AF_RXRPC socket 345 * - pointed to by transport socket struct sk_user_data 346 */ 347 struct rxrpc_local { 348 struct rcu_head rcu; 349 atomic_t active_users; /* Number of users of the local endpoint */ 350 refcount_t ref; /* Number of references to the structure */ 351 struct net *net; /* The network namespace */ 352 struct rxrpc_net *rxnet; /* Our bits in the network namespace */ 353 struct hlist_node link; 354 struct socket *socket; /* my UDP socket */ 355 struct task_struct *io_thread; 356 struct completion io_thread_ready; /* Indication that the I/O thread started */ 357 struct page_frag_cache tx_alloc; /* Tx control packet allocation (I/O thread only) */ 358 struct rxrpc_sock *service; /* Service(s) listening on this endpoint */ 359 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY 360 struct sk_buff_head rx_delay_queue; /* Delay injection queue */ 361 #endif 362 struct sk_buff_head rx_queue; /* Received packets */ 363 struct list_head conn_attend_q; /* Conns requiring immediate attention */ 364 struct list_head call_attend_q; /* Calls requiring immediate attention */ 365 366 struct rb_root client_bundles; /* Client connection bundles by socket params */ 367 spinlock_t client_bundles_lock; /* Lock for client_bundles */ 368 bool kill_all_client_conns; 369 struct list_head idle_client_conns; 370 struct timer_list client_conn_reap_timer; 371 unsigned long client_conn_flags; 372 #define RXRPC_CLIENT_CONN_REAP_TIMER 0 /* The client conn reap timer expired */ 373 374 spinlock_t lock; /* access lock */ 375 rwlock_t services_lock; /* lock for services list */ 376 int debug_id; /* debug ID for printks */ 377 bool dead; 378 bool service_closed; /* Service socket closed */ 379 struct idr conn_ids; /* List of connection IDs */ 380 struct list_head new_client_calls; /* Newly created client calls need connection */ 381 spinlock_t client_call_lock; /* Lock for ->new_client_calls */ 382 struct sockaddr_rxrpc srx; /* local address */ 383 union { 384 /* Provide a kvec table sufficiently large to manage either a 385 * DATA packet with a maximum set of jumbo subpackets or a PING 386 * ACK padded out to 64K with zeropages for PMTUD. 387 */ 388 struct kvec kvec[1 + RXRPC_MAX_NR_JUMBO > 3 + 16 ? 389 1 + RXRPC_MAX_NR_JUMBO : 3 + 16]; 390 struct bio_vec bvec[3 + 16]; 391 }; 392 }; 393 394 /* 395 * RxRPC remote transport endpoint definition 396 * - matched by local endpoint, remote port, address and protocol type 397 */ 398 struct rxrpc_peer { 399 struct rcu_head rcu; /* This must be first */ 400 refcount_t ref; 401 unsigned long hash_key; 402 struct hlist_node hash_link; 403 struct rxrpc_local *local; 404 struct hlist_head error_targets; /* targets for net error distribution */ 405 struct rb_root service_conns; /* Service connections */ 406 struct list_head keepalive_link; /* Link in net->peer_keepalive[] */ 407 unsigned long app_data; /* Application data (e.g. afs_server) */ 408 unsigned int last_tx_at; /* Last time packet sent here (time64_t LSW) */ 409 seqlock_t service_conn_lock; 410 spinlock_t lock; /* access lock */ 411 int debug_id; /* debug ID for printks */ 412 struct sockaddr_rxrpc srx; /* remote address */ 413 414 /* Path MTU discovery [RFC8899] */ 415 unsigned int pmtud_trial; /* Current MTU probe size */ 416 unsigned int pmtud_good; /* Largest working MTU probe we've tried */ 417 unsigned int pmtud_bad; /* Smallest non-working MTU probe we've tried */ 418 bool pmtud_lost; /* T if MTU probe was lost */ 419 bool pmtud_probing; /* T if we have an active probe outstanding */ 420 bool pmtud_pending; /* T if a call to this peer should send a probe */ 421 u8 pmtud_jumbo; /* Max jumbo packets for the MTU */ 422 bool ackr_adv_pmtud; /* T if the peer advertises path-MTU */ 423 unsigned int ackr_max_data; /* Maximum data advertised by peer */ 424 unsigned int if_mtu; /* Local interface MTU (- hdrsize) for this peer */ 425 unsigned int max_data; /* Maximum packet data capacity for this peer */ 426 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */ 427 unsigned short tx_seg_max; /* Maximum number of transmissable segments */ 428 429 /* Calculated RTT cache */ 430 unsigned int recent_srtt_us; 431 unsigned int recent_rto_us; 432 433 u8 cong_ssthresh; /* Congestion slow-start threshold */ 434 }; 435 436 /* 437 * Keys for matching a connection. 438 */ 439 struct rxrpc_conn_proto { 440 union { 441 struct { 442 u32 epoch; /* epoch of this connection */ 443 u32 cid; /* connection ID */ 444 }; 445 u64 index_key; 446 }; 447 }; 448 449 struct rxrpc_conn_parameters { 450 struct rxrpc_local *local; /* Representation of local endpoint */ 451 struct rxrpc_peer *peer; /* Representation of remote endpoint */ 452 struct key *key; /* Security details */ 453 bool exclusive; /* T if conn is exclusive */ 454 bool upgrade; /* T if service ID can be upgraded */ 455 u16 service_id; /* Service ID for this connection */ 456 u32 security_level; /* Security level selected */ 457 }; 458 459 /* 460 * Call completion condition (state == RXRPC_CALL_COMPLETE). 461 */ 462 enum rxrpc_call_completion { 463 RXRPC_CALL_SUCCEEDED, /* - Normal termination */ 464 RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */ 465 RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */ 466 RXRPC_CALL_LOCAL_ERROR, /* - call failed due to local error */ 467 RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */ 468 NR__RXRPC_CALL_COMPLETIONS 469 }; 470 471 /* 472 * Bits in the connection flags. 473 */ 474 enum rxrpc_conn_flag { 475 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */ 476 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */ 477 RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */ 478 RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */ 479 RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */ 480 RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */ 481 RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */ 482 }; 483 484 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \ 485 (1UL << RXRPC_CONN_FINAL_ACK_1) | \ 486 (1UL << RXRPC_CONN_FINAL_ACK_2) | \ 487 (1UL << RXRPC_CONN_FINAL_ACK_3)) 488 489 /* 490 * Events that can be raised upon a connection. 491 */ 492 enum rxrpc_conn_event { 493 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */ 494 RXRPC_CONN_EV_ABORT_CALLS, /* Abort attached calls */ 495 }; 496 497 /* 498 * The connection protocol state. 499 */ 500 enum rxrpc_conn_proto_state { 501 RXRPC_CONN_UNUSED, /* Connection not yet attempted */ 502 RXRPC_CONN_CLIENT_UNSECURED, /* Client connection needs security init */ 503 RXRPC_CONN_CLIENT, /* Client connection */ 504 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */ 505 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */ 506 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */ 507 RXRPC_CONN_SERVICE, /* Service secured connection */ 508 RXRPC_CONN_ABORTED, /* Conn aborted */ 509 RXRPC_CONN__NR_STATES 510 }; 511 512 /* 513 * RxRPC client connection bundle. 514 */ 515 struct rxrpc_bundle { 516 struct rxrpc_local *local; /* Representation of local endpoint */ 517 struct rxrpc_peer *peer; /* Remote endpoint */ 518 struct key *key; /* Security details */ 519 struct list_head proc_link; /* Link in net->bundle_proc_list */ 520 const struct rxrpc_security *security; /* applied security module */ 521 refcount_t ref; 522 atomic_t active; /* Number of active users */ 523 unsigned int debug_id; 524 u32 security_level; /* Security level selected */ 525 u16 service_id; /* Service ID for this connection */ 526 bool try_upgrade; /* True if the bundle is attempting upgrade */ 527 bool exclusive; /* T if conn is exclusive */ 528 bool upgrade; /* T if service ID can be upgraded */ 529 unsigned short alloc_error; /* Error from last conn allocation */ 530 struct rb_node local_node; /* Node in local->client_conns */ 531 struct list_head waiting_calls; /* Calls waiting for channels */ 532 unsigned long avail_chans; /* Mask of available channels */ 533 unsigned int conn_ids[4]; /* Connection IDs. */ 534 struct rxrpc_connection *conns[4]; /* The connections in the bundle (max 4) */ 535 }; 536 537 /* 538 * RxRPC connection definition 539 * - matched by { local, peer, epoch, conn_id, direction } 540 * - each connection can only handle four simultaneous calls 541 */ 542 struct rxrpc_connection { 543 struct rxrpc_conn_proto proto; 544 struct rxrpc_local *local; /* Representation of local endpoint */ 545 struct rxrpc_peer *peer; /* Remote endpoint */ 546 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ 547 struct key *key; /* Security details */ 548 struct list_head attend_link; /* Link in local->conn_attend_q */ 549 550 refcount_t ref; 551 atomic_t active; /* Active count for service conns */ 552 struct rcu_head rcu; 553 struct list_head cache_link; 554 555 unsigned char act_chans; /* Mask of active channels */ 556 struct rxrpc_channel { 557 unsigned long final_ack_at; /* Time at which to issue final ACK */ 558 struct rxrpc_call *call; /* Active call */ 559 unsigned int call_debug_id; /* call->debug_id */ 560 u32 call_id; /* ID of current call */ 561 u32 call_counter; /* Call ID counter */ 562 u32 last_call; /* ID of last call */ 563 u8 last_type; /* Type of last packet */ 564 union { 565 u32 last_seq; 566 u32 last_abort; 567 }; 568 } channels[RXRPC_MAXCALLS]; 569 570 struct timer_list timer; /* Conn event timer */ 571 struct work_struct processor; /* connection event processor */ 572 struct work_struct destructor; /* In-process-context destroyer */ 573 struct rxrpc_bundle *bundle; /* Client connection bundle */ 574 struct rb_node service_node; /* Node in peer->service_conns */ 575 struct list_head proc_link; /* link in procfs list */ 576 struct list_head link; /* link in master connection list */ 577 struct sk_buff_head rx_queue; /* received conn-level packets */ 578 struct page_frag_cache tx_data_alloc; /* Tx DATA packet allocation */ 579 struct mutex tx_data_alloc_lock; 580 581 struct mutex security_lock; /* Lock for security management */ 582 const struct rxrpc_security *security; /* applied security module */ 583 union { 584 struct { 585 struct fcrypt_key *cipher; /* encryption key */ 586 struct rxrpc_crypt csum_iv; /* packet checksum base */ 587 u32 nonce; /* response re-use preventer */ 588 } rxkad; 589 struct { 590 struct rxgk_context *keys[4]; /* (Re-)keying buffer */ 591 u64 start_time; /* The start time for TK derivation */ 592 u8 nonce[20]; /* Response re-use preventer */ 593 u32 enctype; /* Kerberos 5 encoding type */ 594 u32 key_number; /* Current key number */ 595 } rxgk; 596 }; 597 rwlock_t security_use_lock; /* Security use/modification lock */ 598 struct sk_buff *tx_response; /* Response packet to be transmitted */ 599 600 unsigned long flags; 601 unsigned long events; 602 unsigned long idle_timestamp; /* Time at which last became idle */ 603 spinlock_t state_lock; /* state-change lock */ 604 enum rxrpc_conn_proto_state state; /* current state of connection */ 605 enum rxrpc_call_completion completion; /* Completion condition */ 606 s32 abort_code; /* Abort code of connection abort */ 607 int debug_id; /* debug ID for printks */ 608 rxrpc_serial_t tx_serial; /* Outgoing packet serial number counter */ 609 unsigned int hi_serial; /* highest serial number received */ 610 rxrpc_serial_t pmtud_probe; /* Serial of MTU probe (or 0) */ 611 unsigned int pmtud_call; /* ID of call used for probe */ 612 u32 service_id; /* Service ID, possibly upgraded */ 613 u32 security_level; /* Security level selected */ 614 u8 security_ix; /* security type */ 615 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */ 616 u8 bundle_shift; /* Index into bundle->avail_chans */ 617 bool exclusive; /* T if conn is exclusive */ 618 bool upgrade; /* T if service ID can be upgraded */ 619 u16 orig_service_id; /* Originally requested service ID */ 620 short error; /* Local error code */ 621 }; 622 623 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp) 624 { 625 return sp->hdr.flags & RXRPC_CLIENT_INITIATED; 626 } 627 628 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp) 629 { 630 return !rxrpc_to_server(sp); 631 } 632 633 /* 634 * Flags in call->flags. 635 */ 636 enum rxrpc_call_flag { 637 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */ 638 RXRPC_CALL_HAS_USERID, /* has a user ID attached */ 639 RXRPC_CALL_IS_SERVICE, /* Call is service call */ 640 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */ 641 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */ 642 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */ 643 RXRPC_CALL_TX_ALL_ACKED, /* Last packet has been hard-acked */ 644 RXRPC_CALL_TX_NO_MORE, /* No more data to transmit (MSG_MORE deasserted) */ 645 RXRPC_CALL_SEND_PING, /* A ping will need to be sent */ 646 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */ 647 RXRPC_CALL_BEGAN_RX_TIMER, /* We began the expect_rx_by timer */ 648 RXRPC_CALL_RX_HEARD, /* The peer responded at least once to this call */ 649 RXRPC_CALL_DISCONNECTED, /* The call has been disconnected */ 650 RXRPC_CALL_KERNEL, /* The call was made by the kernel */ 651 RXRPC_CALL_UPGRADE, /* Service upgrade was requested for the call */ 652 RXRPC_CALL_EXCLUSIVE, /* The call uses a once-only connection */ 653 RXRPC_CALL_RX_IS_IDLE, /* recvmsg() is idle - send an ACK */ 654 RXRPC_CALL_RECVMSG_READ_ALL, /* recvmsg() read all of the received data */ 655 RXRPC_CALL_CONN_CHALLENGING, /* The connection is being challenged */ 656 }; 657 658 /* 659 * Events that can be raised on a call. 660 */ 661 enum rxrpc_call_event { 662 RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */ 663 RXRPC_CALL_EV_INITIAL_PING, /* Send initial ping for a new service call */ 664 }; 665 666 /* 667 * The states that a call can be in. 668 */ 669 enum rxrpc_call_state { 670 RXRPC_CALL_UNINITIALISED, 671 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */ 672 RXRPC_CALL_CLIENT_PRE_SEND, /* - client is connected, but hasn't sent anything yet */ 673 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */ 674 RXRPC_CALL_CLIENT_AWAIT_ACK, /* - client awaiting ACKs of request */ 675 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */ 676 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */ 677 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */ 678 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */ 679 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */ 680 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */ 681 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */ 682 RXRPC_CALL_COMPLETE, /* - call complete */ 683 NR__RXRPC_CALL_STATES 684 }; 685 686 /* 687 * Call Tx congestion management modes. 688 */ 689 enum rxrpc_ca_state { 690 RXRPC_CA_SLOW_START, 691 RXRPC_CA_CONGEST_AVOIDANCE, 692 RXRPC_CA_PACKET_LOSS, 693 RXRPC_CA_FAST_RETRANSMIT, 694 NR__RXRPC_CA_STATES 695 } __mode(byte); 696 697 /* 698 * Current purpose of call RACK timer. According to the RACK-TLP protocol 699 * [RFC8985], the transmission timer (call->rack_timo_at) may only be used for 700 * one of these at once. 701 */ 702 enum rxrpc_rack_timer_mode { 703 RXRPC_CALL_RACKTIMER_OFF, /* Timer not running */ 704 RXRPC_CALL_RACKTIMER_RACK_REORDER, /* RACK reordering timer */ 705 RXRPC_CALL_RACKTIMER_TLP_PTO, /* TLP timeout */ 706 RXRPC_CALL_RACKTIMER_RTO, /* Retransmission timeout */ 707 } __mode(byte); 708 709 /* 710 * RxRPC call definition 711 * - matched by { connection, call_id } 712 */ 713 struct rxrpc_call { 714 struct rcu_head rcu; 715 struct rxrpc_connection *conn; /* connection carrying call */ 716 struct rxrpc_bundle *bundle; /* Connection bundle to use */ 717 struct rxrpc_peer *peer; /* Peer record for remote address */ 718 struct rxrpc_local *local; /* Representation of local endpoint */ 719 struct rxrpc_sock __rcu *socket; /* socket responsible */ 720 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ 721 struct key *key; /* Security details */ 722 const struct rxrpc_security *security; /* applied security module */ 723 struct mutex user_mutex; /* User access mutex */ 724 struct sockaddr_rxrpc dest_srx; /* Destination address */ 725 ktime_t delay_ack_at; /* When DELAY ACK needs to happen */ 726 ktime_t rack_timo_at; /* When ACK is figured as lost */ 727 ktime_t ping_at; /* When next to send a ping */ 728 ktime_t keepalive_at; /* When next to send a keepalive ping */ 729 ktime_t expect_rx_by; /* When we expect to get a packet by */ 730 ktime_t expect_req_by; /* When we expect to get a request DATA packet by */ 731 ktime_t expect_term_by; /* When we expect call termination by */ 732 u32 next_rx_timo; /* Timeout for next Rx packet (ms) */ 733 u32 next_req_timo; /* Timeout for next Rx request packet (ms) */ 734 u32 hard_timo; /* Maximum lifetime or 0 (s) */ 735 struct timer_list timer; /* Combined event timer */ 736 struct work_struct destroyer; /* In-process-context destroyer */ 737 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */ 738 struct list_head link; /* link in master call list */ 739 struct list_head wait_link; /* Link in local->new_client_calls */ 740 struct hlist_node error_link; /* link in error distribution list */ 741 struct list_head accept_link; /* Link in rx->acceptq */ 742 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */ 743 struct list_head sock_link; /* Link in rx->sock_calls */ 744 struct rb_node sock_node; /* Node in rx->calls */ 745 struct list_head attend_link; /* Link in local->call_attend_q */ 746 struct rxrpc_txbuf *tx_pending; /* Tx buffer being filled */ 747 wait_queue_head_t waitq; /* Wait queue for channel or Tx */ 748 s64 tx_total_len; /* Total length left to be transmitted (or -1) */ 749 unsigned long user_call_ID; /* user-defined call ID */ 750 unsigned long flags; 751 unsigned long events; 752 spinlock_t notify_lock; /* Kernel notification lock */ 753 unsigned int send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */ 754 s32 send_abort; /* Abort code to be sent */ 755 short send_abort_err; /* Error to be associated with the abort */ 756 rxrpc_seq_t send_abort_seq; /* DATA packet that incurred the abort (or 0) */ 757 s32 abort_code; /* Local/remote abort code */ 758 int error; /* Local error incurred */ 759 enum rxrpc_call_state _state; /* Current state of call (needs barrier) */ 760 enum rxrpc_call_completion completion; /* Call completion condition */ 761 refcount_t ref; 762 u8 security_ix; /* Security type */ 763 enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */ 764 u32 call_id; /* call ID on connection */ 765 u32 cid; /* connection ID plus channel index */ 766 u32 security_level; /* Security level selected */ 767 u32 security_enctype; /* Security-specific encoding type (or 0) */ 768 int debug_id; /* debug ID for printks */ 769 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */ 770 unsigned short rx_pkt_len; /* Current recvmsg packet len */ 771 772 /* Sendmsg data tracking. */ 773 rxrpc_seq_t send_top; /* Highest Tx slot filled by sendmsg. */ 774 struct rxrpc_txqueue *send_queue; /* Queue that sendmsg is writing into */ 775 776 /* Transmitted data tracking. */ 777 struct rxrpc_txqueue *tx_queue; /* Start of transmission buffers */ 778 struct rxrpc_txqueue *tx_qtail; /* End of transmission buffers */ 779 rxrpc_seq_t tx_qbase; /* First slot in tx_queue */ 780 rxrpc_seq_t tx_bottom; /* First packet in buffer */ 781 rxrpc_seq_t tx_transmitted; /* Highest packet transmitted */ 782 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */ 783 rxrpc_serial_t tx_last_serial; /* Serial of last DATA transmitted */ 784 u16 tx_backoff; /* Delay to insert due to Tx failure (ms) */ 785 u16 tx_nr_sent; /* Number of packets sent, but unacked */ 786 u16 tx_nr_lost; /* Number of packets marked lost */ 787 u16 tx_nr_resent; /* Number of packets resent, but unacked */ 788 u16 tx_winsize; /* Maximum size of Tx window */ 789 #define RXRPC_TX_MAX_WINDOW 128 790 u8 tx_jumbo_max; /* Maximum subpkts peer will accept */ 791 ktime_t tx_last_sent; /* Last time a transmission occurred */ 792 793 /* Received data tracking */ 794 struct sk_buff_head recvmsg_queue; /* Queue of packets ready for recvmsg() */ 795 struct sk_buff_head rx_queue; /* Queue of packets for this call to receive */ 796 struct sk_buff_head rx_oos_queue; /* Queue of out of sequence packets */ 797 void *rx_dec_buffer; /* Decryption buffer */ 798 unsigned short rx_dec_bsize; /* rx_dec_buffer size */ 799 unsigned short rx_dec_offset; /* Decrypted packet data offset */ 800 unsigned short rx_dec_len; /* Decrypted packet data len */ 801 rxrpc_seq_t rx_dec_seq; /* Packet in decryption buffer */ 802 803 rxrpc_seq_t rx_highest_seq; /* Higest sequence number received */ 804 rxrpc_seq_t rx_consumed; /* Highest packet consumed */ 805 rxrpc_serial_t rx_serial; /* Highest serial received for this call */ 806 u8 rx_winsize; /* Size of Rx window */ 807 808 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS 809 * is fixed, we keep these numbers in terms of segments (ie. DATA 810 * packets) rather than bytes. 811 */ 812 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN 813 #define RXRPC_MIN_CWND 4 814 enum rxrpc_ca_state cong_ca_state; /* Congestion control state */ 815 u8 cong_extra; /* Extra to send for congestion management */ 816 u16 cong_cwnd; /* Congestion window size */ 817 u16 cong_ssthresh; /* Slow-start threshold */ 818 u16 cong_dup_acks; /* Count of ACKs showing missing packets */ 819 u16 cong_cumul_acks; /* Cumulative ACK count */ 820 ktime_t cong_tstamp; /* Last time cwnd was changed */ 821 822 /* RACK-TLP [RFC8985] state. */ 823 ktime_t rack_xmit_ts; /* Latest transmission timestamp */ 824 ktime_t rack_rtt; /* RTT of most recently ACK'd segment */ 825 ktime_t rack_rtt_ts; /* Timestamp of rack_rtt */ 826 ktime_t rack_reo_wnd; /* Reordering window */ 827 unsigned int rack_reo_wnd_mult; /* Multiplier applied to rack_reo_wnd */ 828 int rack_reo_wnd_persist; /* Num loss recoveries before reset reo_wnd */ 829 rxrpc_seq_t rack_fack; /* Highest sequence so far ACK'd */ 830 rxrpc_seq_t rack_end_seq; /* Highest sequence seen */ 831 rxrpc_seq_t rack_dsack_round; /* DSACK opt recv'd in latest roundtrip */ 832 bool rack_dsack_round_none; /* T if dsack_round is "None" */ 833 bool rack_reordering_seen; /* T if detected reordering event */ 834 enum rxrpc_rack_timer_mode rack_timer_mode; /* Current mode of RACK timer */ 835 bool tlp_is_retrans; /* T if unacked TLP retransmission */ 836 rxrpc_serial_t tlp_serial; /* Serial of TLP probe (or 0 if none in progress) */ 837 rxrpc_seq_t tlp_seq; /* Sequence of TLP probe */ 838 unsigned int tlp_rtt_taken; /* Last time RTT taken */ 839 ktime_t tlp_max_ack_delay; /* Sender budget for max delayed ACK interval */ 840 841 /* Receive-phase ACK management (ACKs we send). */ 842 u8 ackr_reason; /* reason to ACK */ 843 u16 ackr_sack_base; /* Starting slot in SACK table ring */ 844 rxrpc_seq_t ackr_window; /* Base of SACK window */ 845 rxrpc_seq_t ackr_wtop; /* Base of SACK window */ 846 unsigned int ackr_nr_unacked; /* Number of unacked packets */ 847 atomic_t ackr_nr_consumed; /* Number of packets needing hard ACK */ 848 struct { 849 #define RXRPC_SACK_SIZE 256 850 /* SACK table for soft-acked packets */ 851 u8 ackr_sack_table[RXRPC_SACK_SIZE]; 852 } __aligned(8); 853 854 /* RTT management */ 855 rxrpc_serial_t rtt_serial[4]; /* Serial number of DATA or PING sent */ 856 ktime_t rtt_sent_at[4]; /* Time packet sent */ 857 unsigned long rtt_avail; /* Mask of available slots in bits 0-3, 858 * Mask of pending samples in 8-11 */ 859 #define RXRPC_CALL_RTT_AVAIL_MASK 0xf 860 #define RXRPC_CALL_RTT_PEND_SHIFT 8 861 862 /* Transmission-phase ACK management (ACKs we've received). */ 863 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */ 864 rxrpc_seq_t acks_hard_ack; /* Highest sequence hard acked */ 865 rxrpc_seq_t acks_prev_seq; /* Highest previousPacket received */ 866 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */ 867 rxrpc_serial_t acks_highest_serial; /* Highest serial number ACK'd */ 868 unsigned short acks_nr_sacks; /* Number of soft acks recorded */ 869 unsigned short acks_nr_snacks; /* Number of soft nacks recorded */ 870 871 /* Calculated RTT cache */ 872 ktime_t rtt_last_req; /* Time of last RTT request */ 873 unsigned int rtt_count; /* Number of samples we've got */ 874 unsigned int rtt_taken; /* Number of samples taken (wrapping) */ 875 struct minmax min_rtt; /* Estimated minimum RTT */ 876 u32 srtt_us; /* smoothed round trip time << 3 in usecs */ 877 u32 mdev_us; /* medium deviation */ 878 u32 mdev_max_us; /* maximal mdev for the last rtt period */ 879 u32 rttvar_us; /* smoothed mdev_max */ 880 u32 rto_us; /* Retransmission timeout in usec */ 881 u8 backoff; /* Backoff timeout (as shift) */ 882 }; 883 884 /* 885 * Summary of a new ACK and the changes it made to the Tx buffer packet states. 886 */ 887 struct rxrpc_ack_summary { 888 rxrpc_serial_t ack_serial; /* Serial number of ACK */ 889 rxrpc_serial_t acked_serial; /* Serial number ACK'd */ 890 u16 in_flight; /* Number of unreceived transmissions */ 891 u16 nr_new_hacks; /* Number of rotated new ACKs */ 892 u16 nr_new_sacks; /* Number of new soft ACKs in packet */ 893 u16 nr_new_snacks; /* Number of new soft nacks in packet */ 894 u8 ack_reason; 895 bool new_low_snack:1; /* T if new low soft NACK found */ 896 bool retrans_timeo:1; /* T if reTx due to timeout happened */ 897 bool need_retransmit:1; /* T if we need transmission */ 898 bool rtt_sample_avail:1; /* T if RTT sample available */ 899 bool in_fast_or_rto_recovery:1; 900 bool exiting_fast_or_rto_recovery:1; 901 bool tlp_probe_acked:1; /* T if the TLP probe seq was acked */ 902 u8 /*enum rxrpc_congest_change*/ change; 903 }; 904 905 /* 906 * sendmsg() cmsg-specified parameters. 907 */ 908 enum rxrpc_command { 909 RXRPC_CMD_SEND_DATA, /* send data message */ 910 RXRPC_CMD_SEND_ABORT, /* request abort generation */ 911 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */ 912 RXRPC_CMD_CHARGE_ACCEPT, /* [server] charge accept preallocation */ 913 }; 914 915 struct rxrpc_call_params { 916 s64 tx_total_len; /* Total Tx data length (if send data) */ 917 unsigned long user_call_ID; /* User's call ID */ 918 struct { 919 u32 hard; /* Maximum lifetime (sec) */ 920 u32 idle; /* Max time since last data packet (msec) */ 921 u32 normal; /* Max time since last call packet (msec) */ 922 } timeouts; 923 u8 nr_timeouts; /* Number of timeouts specified */ 924 bool kernel; /* T if kernel is making the call */ 925 enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */ 926 }; 927 928 struct rxrpc_send_params { 929 struct rxrpc_call_params call; 930 u32 abort_code; /* Abort code to Tx (if abort) */ 931 enum rxrpc_command command : 8; /* The command to implement */ 932 bool exclusive; /* Shared or exclusive call */ 933 bool upgrade; /* If the connection is upgradeable */ 934 }; 935 936 /* 937 * Buffer of data to be output as a packet. 938 */ 939 struct rxrpc_txbuf { 940 refcount_t ref; 941 rxrpc_seq_t seq; /* Sequence number of this packet */ 942 rxrpc_serial_t serial; /* Last serial number transmitted with */ 943 unsigned int call_debug_id; 944 unsigned int debug_id; 945 unsigned short len; /* Amount of data in buffer */ 946 unsigned short space; /* Remaining data space */ 947 unsigned short offset; /* Offset of fill point */ 948 unsigned short crypto_header; /* Size of crypto header */ 949 unsigned short sec_header; /* Size of security header */ 950 unsigned short pkt_len; /* Size of packet content */ 951 unsigned short alloc_size; /* Amount of bufferage allocated */ 952 unsigned int flags; 953 #define RXRPC_TXBUF_WIRE_FLAGS 0xff /* The wire protocol flags */ 954 #define RXRPC_TXBUF_RESENT 0x100 /* Set if has been resent */ 955 __be16 cksum; /* Checksum to go in header */ 956 bool jumboable; /* Can be non-terminal jumbo subpacket */ 957 void *data; /* Data with preceding jumbo header */ 958 }; 959 960 static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb) 961 { 962 return txb->flags & RXRPC_CLIENT_INITIATED; 963 } 964 965 static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb) 966 { 967 return !rxrpc_sending_to_server(txb); 968 } 969 970 /* 971 * Transmit queue element, including RACK [RFC8985] per-segment metadata. The 972 * transmission timestamp is in usec from the base. 973 */ 974 struct rxrpc_txqueue { 975 /* Start with the members we want to prefetch. */ 976 struct rxrpc_txqueue *next; 977 ktime_t xmit_ts_base; 978 rxrpc_seq_t qbase; 979 u8 nr_reported_acks; /* Number of segments explicitly acked/nacked */ 980 unsigned long segment_acked; /* Bit-per-buf: Set if ACK'd */ 981 unsigned long segment_lost; /* Bit-per-buf: Set if declared lost */ 982 unsigned long segment_retransmitted; /* Bit-per-buf: Set if retransmitted */ 983 unsigned long rtt_samples; /* Bit-per-buf: Set if available for RTT */ 984 unsigned long ever_retransmitted; /* Bit-per-buf: Set if ever retransmitted */ 985 986 /* The arrays we want to pack into as few cache lines as possible. */ 987 struct { 988 #define RXRPC_NR_TXQUEUE BITS_PER_LONG 989 #define RXRPC_TXQ_MASK (RXRPC_NR_TXQUEUE - 1) 990 struct rxrpc_txbuf *bufs[RXRPC_NR_TXQUEUE]; 991 unsigned int segment_serial[RXRPC_NR_TXQUEUE]; 992 unsigned int segment_xmit_ts[RXRPC_NR_TXQUEUE]; 993 } ____cacheline_aligned; 994 }; 995 996 /* 997 * Data transmission request. 998 */ 999 struct rxrpc_send_data_req { 1000 ktime_t now; /* Current time */ 1001 struct rxrpc_txqueue *tq; /* Tx queue segment holding first DATA */ 1002 rxrpc_seq_t seq; /* Sequence of first data */ 1003 int n; /* Number of DATA packets to glue into jumbo */ 1004 bool retrans; /* T if this is a retransmission */ 1005 bool did_send; /* T if did actually send */ 1006 bool tlp_probe; /* T if this is a TLP probe */ 1007 int /* enum rxrpc_txdata_trace */ trace; 1008 }; 1009 1010 #include <trace/events/rxrpc.h> 1011 1012 /* 1013 * Allocate the next serial number on a connection. 0 must be skipped. 1014 */ 1015 static inline rxrpc_serial_t rxrpc_get_next_serial(struct rxrpc_connection *conn) 1016 { 1017 rxrpc_serial_t serial; 1018 1019 serial = conn->tx_serial; 1020 if (serial == 0) 1021 serial = 1; 1022 conn->tx_serial = serial + 1; 1023 return serial; 1024 } 1025 1026 /* 1027 * Allocate the next serial n numbers on a connection. 0 must be skipped. 1028 */ 1029 static inline rxrpc_serial_t rxrpc_get_next_serials(struct rxrpc_connection *conn, 1030 unsigned int n) 1031 { 1032 rxrpc_serial_t serial; 1033 1034 serial = conn->tx_serial; 1035 if (serial + n <= n) 1036 serial = 1; 1037 conn->tx_serial = serial + n; 1038 return serial; 1039 } 1040 1041 /* 1042 * af_rxrpc.c 1043 */ 1044 extern atomic_t rxrpc_n_rx_skbs; 1045 extern struct workqueue_struct *rxrpc_workqueue; 1046 1047 /* 1048 * call_accept.c 1049 */ 1050 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t); 1051 void rxrpc_discard_prealloc(struct rxrpc_sock *); 1052 bool rxrpc_new_incoming_call(struct rxrpc_local *local, 1053 struct rxrpc_peer *peer, 1054 struct rxrpc_connection *conn, 1055 struct sockaddr_rxrpc *peer_srx, 1056 struct sk_buff *skb); 1057 int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long); 1058 1059 /* 1060 * call_event.c 1061 */ 1062 void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial, 1063 enum rxrpc_propose_ack_trace why); 1064 void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t, 1065 enum rxrpc_propose_ack_trace); 1066 void rxrpc_resend_tlp(struct rxrpc_call *call); 1067 void rxrpc_transmit_some_data(struct rxrpc_call *call, unsigned int limit, 1068 enum rxrpc_txdata_trace trace); 1069 bool rxrpc_input_call_event(struct rxrpc_call *call); 1070 1071 /* 1072 * call_object.c 1073 */ 1074 extern const char *const rxrpc_call_states[]; 1075 extern const char *const rxrpc_call_completions[]; 1076 extern struct kmem_cache *rxrpc_call_jar; 1077 1078 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what); 1079 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long); 1080 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int); 1081 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *, 1082 struct rxrpc_conn_parameters *, 1083 struct rxrpc_call_params *, gfp_t, 1084 unsigned int) 1085 __releases(&rx->sk.sk_lock) 1086 __acquires(&call->user_mutex); 1087 void rxrpc_start_call_timer(struct rxrpc_call *call); 1088 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *, 1089 struct sk_buff *); 1090 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *); 1091 void rxrpc_release_calls_on_socket(struct rxrpc_sock *); 1092 void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace); 1093 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 1094 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 1095 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace); 1096 void rxrpc_cleanup_call(struct rxrpc_call *); 1097 void rxrpc_destroy_all_calls(struct rxrpc_net *); 1098 1099 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call) 1100 { 1101 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags); 1102 } 1103 1104 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call) 1105 { 1106 return !rxrpc_is_service_call(call); 1107 } 1108 1109 /* 1110 * call_state.c 1111 */ 1112 bool rxrpc_set_call_completion(struct rxrpc_call *call, 1113 enum rxrpc_call_completion compl, 1114 u32 abort_code, 1115 int error); 1116 bool rxrpc_call_completed(struct rxrpc_call *call); 1117 bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq, 1118 u32 abort_code, int error, enum rxrpc_abort_reason why); 1119 void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl, 1120 int error); 1121 1122 static inline void rxrpc_set_call_state(struct rxrpc_call *call, 1123 enum rxrpc_call_state state) 1124 { 1125 /* Order write of completion info before write of ->state. */ 1126 smp_store_release(&call->_state, state); 1127 wake_up(&call->waitq); 1128 } 1129 1130 static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call) 1131 { 1132 return call->_state; /* Only inside I/O thread */ 1133 } 1134 1135 static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call) 1136 { 1137 return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; 1138 } 1139 1140 static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call) 1141 { 1142 /* Order read ->state before read of completion info. */ 1143 return smp_load_acquire(&call->_state); 1144 } 1145 1146 static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call) 1147 { 1148 return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; 1149 } 1150 1151 static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call) 1152 { 1153 return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED; 1154 } 1155 1156 /* 1157 * conn_client.c 1158 */ 1159 extern unsigned int rxrpc_reap_client_connections; 1160 extern unsigned long rxrpc_conn_idle_client_expiry; 1161 extern unsigned long rxrpc_conn_idle_client_fast_expiry; 1162 1163 void rxrpc_purge_client_connections(struct rxrpc_local *local); 1164 struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 1165 void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 1166 int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp); 1167 void rxrpc_connect_client_calls(struct rxrpc_local *local); 1168 void rxrpc_expose_client_call(struct rxrpc_call *); 1169 void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *); 1170 void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle); 1171 void rxrpc_discard_expired_client_conns(struct rxrpc_local *local); 1172 void rxrpc_clean_up_local_conns(struct rxrpc_local *); 1173 1174 /* 1175 * conn_event.c 1176 */ 1177 void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb, 1178 unsigned int channel); 1179 int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb, 1180 s32 abort_code, int err, enum rxrpc_abort_reason why); 1181 void rxrpc_process_connection(struct work_struct *); 1182 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool); 1183 bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb); 1184 void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb); 1185 1186 static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn) 1187 { 1188 /* Order reading the abort info after the state check. */ 1189 return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED; 1190 } 1191 1192 /* 1193 * conn_object.c 1194 */ 1195 extern unsigned int rxrpc_connection_expiry; 1196 extern unsigned int rxrpc_closed_conn_expiry; 1197 1198 void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why); 1199 struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t); 1200 struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *, 1201 struct sockaddr_rxrpc *, 1202 struct sk_buff *); 1203 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *); 1204 void rxrpc_disconnect_call(struct rxrpc_call *); 1205 void rxrpc_kill_client_conn(struct rxrpc_connection *); 1206 void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace); 1207 void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 1208 struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *, 1209 enum rxrpc_conn_trace); 1210 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *, 1211 enum rxrpc_conn_trace); 1212 void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 1213 void rxrpc_service_connection_reaper(struct work_struct *); 1214 void rxrpc_destroy_all_connections(struct rxrpc_net *); 1215 1216 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn) 1217 { 1218 return conn->out_clientflag; 1219 } 1220 1221 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn) 1222 { 1223 return !rxrpc_conn_is_client(conn); 1224 } 1225 1226 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn, 1227 unsigned long expire_at) 1228 { 1229 timer_reduce(&conn->timer, expire_at); 1230 } 1231 1232 /* 1233 * conn_service.c 1234 */ 1235 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *, 1236 struct sk_buff *); 1237 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t); 1238 void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *, 1239 const struct rxrpc_security *, struct sk_buff *); 1240 void rxrpc_unpublish_service_conn(struct rxrpc_connection *); 1241 1242 /* 1243 * input.c 1244 */ 1245 void rxrpc_congestion_degrade(struct rxrpc_call *); 1246 void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *); 1247 void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *); 1248 1249 /* 1250 * input_rack.c 1251 */ 1252 void rxrpc_input_rack_one(struct rxrpc_call *call, 1253 struct rxrpc_ack_summary *summary, 1254 struct rxrpc_txqueue *tq, 1255 unsigned int ix); 1256 void rxrpc_input_rack(struct rxrpc_call *call, 1257 struct rxrpc_ack_summary *summary, 1258 struct rxrpc_txqueue *tq, 1259 unsigned long new_acks); 1260 void rxrpc_rack_detect_loss_and_arm_timer(struct rxrpc_call *call, 1261 struct rxrpc_ack_summary *summary); 1262 ktime_t rxrpc_tlp_calc_pto(struct rxrpc_call *call, ktime_t now); 1263 void rxrpc_tlp_send_probe(struct rxrpc_call *call); 1264 void rxrpc_tlp_process_ack(struct rxrpc_call *call, struct rxrpc_ack_summary *summary); 1265 void rxrpc_rack_timer_expired(struct rxrpc_call *call, ktime_t overran_by); 1266 1267 /* Initialise TLP state [RFC8958 7.1]. */ 1268 static inline void rxrpc_tlp_init(struct rxrpc_call *call) 1269 { 1270 call->tlp_serial = 0; 1271 call->tlp_seq = call->acks_hard_ack; 1272 call->tlp_is_retrans = false; 1273 } 1274 1275 /* 1276 * io_thread.c 1277 */ 1278 int rxrpc_encap_rcv(struct sock *, struct sk_buff *); 1279 void rxrpc_error_report(struct sock *); 1280 bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why, 1281 s32 abort_code, int err); 1282 bool rxrpc_direct_conn_abort(struct sk_buff *skb, enum rxrpc_abort_reason why, 1283 s32 abort_code, int err); 1284 int rxrpc_io_thread(void *data); 1285 void rxrpc_post_response(struct rxrpc_connection *conn, struct sk_buff *skb); 1286 static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local) 1287 { 1288 if (!local->io_thread) 1289 return; 1290 wake_up_process(READ_ONCE(local->io_thread)); 1291 } 1292 1293 static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why) 1294 { 1295 return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO); 1296 } 1297 1298 /* 1299 * insecure.c 1300 */ 1301 extern const struct rxrpc_security rxrpc_no_security; 1302 1303 /* 1304 * key.c 1305 */ 1306 extern struct key_type key_type_rxrpc; 1307 1308 int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int); 1309 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t, 1310 u32); 1311 1312 /* 1313 * local_event.c 1314 */ 1315 void rxrpc_gen_version_string(void); 1316 void rxrpc_send_version_request(struct rxrpc_local *local, 1317 struct rxrpc_host_header *hdr, 1318 struct sk_buff *skb); 1319 1320 /* 1321 * local_object.c 1322 */ 1323 void rxrpc_local_dont_fragment(const struct rxrpc_local *local, bool set); 1324 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *); 1325 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace); 1326 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace); 1327 void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace); 1328 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace); 1329 void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace); 1330 void rxrpc_destroy_local(struct rxrpc_local *local); 1331 void rxrpc_destroy_all_locals(struct rxrpc_net *); 1332 1333 static inline bool __rxrpc_use_local(struct rxrpc_local *local, 1334 enum rxrpc_local_trace why) 1335 { 1336 int r, u; 1337 1338 r = refcount_read(&local->ref); 1339 u = atomic_fetch_add_unless(&local->active_users, 1, 0); 1340 trace_rxrpc_local(local->debug_id, why, r, u); 1341 return u != 0; 1342 } 1343 1344 static inline void rxrpc_see_local(struct rxrpc_local *local, 1345 enum rxrpc_local_trace why) 1346 { 1347 int r, u; 1348 1349 r = refcount_read(&local->ref); 1350 u = atomic_read(&local->active_users); 1351 trace_rxrpc_local(local->debug_id, why, r, u); 1352 } 1353 1354 /* 1355 * misc.c 1356 */ 1357 extern unsigned int rxrpc_max_backlog __read_mostly; 1358 extern unsigned long rxrpc_soft_ack_delay; 1359 extern unsigned long rxrpc_idle_ack_delay; 1360 extern unsigned int rxrpc_rx_window_size; 1361 extern unsigned int rxrpc_rx_mtu; 1362 extern unsigned int rxrpc_rx_jumbo_max; 1363 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY 1364 extern unsigned long rxrpc_inject_rx_delay; 1365 #endif 1366 1367 /* 1368 * net_ns.c 1369 */ 1370 extern unsigned int rxrpc_net_id; 1371 extern struct pernet_operations rxrpc_net_ops; 1372 1373 static inline struct rxrpc_net *rxrpc_net(struct net *net) 1374 { 1375 return net_generic(net, rxrpc_net_id); 1376 } 1377 1378 /* 1379 * oob.c 1380 */ 1381 bool rxrpc_notify_socket_oob(struct rxrpc_call *call, struct sk_buff *skb); 1382 void rxrpc_add_pending_oob(struct rxrpc_sock *rx, struct sk_buff *skb); 1383 int rxrpc_sendmsg_oob(struct rxrpc_sock *rx, struct msghdr *msg, size_t len); 1384 1385 /* 1386 * output.c 1387 */ 1388 ssize_t do_udp_sendmsg(struct socket *socket, struct msghdr *msg, size_t len); 1389 void rxrpc_send_ACK(struct rxrpc_call *call, u8 ack_reason, 1390 rxrpc_serial_t serial, enum rxrpc_propose_ack_trace why); 1391 void rxrpc_send_probe_for_pmtud(struct rxrpc_call *call); 1392 int rxrpc_send_abort_packet(struct rxrpc_call *); 1393 void rxrpc_send_data_packet(struct rxrpc_call *call, struct rxrpc_send_data_req *req); 1394 void rxrpc_send_conn_abort(struct rxrpc_connection *conn); 1395 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb); 1396 void rxrpc_send_keepalive(struct rxrpc_peer *); 1397 void rxrpc_send_response(struct rxrpc_connection *conn, struct sk_buff *skb); 1398 1399 /* 1400 * peer_event.c 1401 */ 1402 void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *); 1403 void rxrpc_peer_keepalive_worker(struct work_struct *); 1404 void rxrpc_input_probe_for_pmtud(struct rxrpc_connection *conn, rxrpc_serial_t acked_serial, 1405 bool sendmsg_fail); 1406 1407 /* Update the last transmission time on a peer for keepalive purposes. */ 1408 static inline void rxrpc_peer_mark_tx(struct rxrpc_peer *peer) 1409 { 1410 /* To avoid tearing on 32-bit systems, we only keep the LSW. */ 1411 WRITE_ONCE(peer->last_tx_at, ktime_get_seconds()); 1412 } 1413 1414 /* 1415 * peer_object.c 1416 */ 1417 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *, 1418 const struct sockaddr_rxrpc *); 1419 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local, 1420 struct sockaddr_rxrpc *srx, gfp_t gfp); 1421 void rxrpc_assess_MTU_size(struct rxrpc_local *local, struct rxrpc_peer *peer); 1422 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t, 1423 enum rxrpc_peer_trace); 1424 void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer); 1425 void rxrpc_destroy_all_peers(struct rxrpc_net *); 1426 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1427 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace); 1428 void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1429 1430 /* 1431 * proc.c 1432 */ 1433 extern const struct seq_operations rxrpc_call_seq_ops; 1434 extern const struct seq_operations rxrpc_connection_seq_ops; 1435 extern const struct seq_operations rxrpc_bundle_seq_ops; 1436 extern const struct seq_operations rxrpc_peer_seq_ops; 1437 extern const struct seq_operations rxrpc_local_seq_ops; 1438 1439 /* 1440 * recvmsg.c 1441 */ 1442 void rxrpc_notify_socket(struct rxrpc_call *); 1443 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int); 1444 1445 /* 1446 * Abort a call due to a protocol error. 1447 */ 1448 static inline int rxrpc_abort_eproto(struct rxrpc_call *call, 1449 struct sk_buff *skb, 1450 s32 abort_code, 1451 enum rxrpc_abort_reason why) 1452 { 1453 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 1454 1455 rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why); 1456 return -EPROTO; 1457 } 1458 1459 /* 1460 * rtt.c 1461 */ 1462 void rxrpc_call_add_rtt(struct rxrpc_call *call, enum rxrpc_rtt_rx_trace why, 1463 int rtt_slot, 1464 rxrpc_serial_t send_serial, rxrpc_serial_t resp_serial, 1465 ktime_t send_time, ktime_t resp_time); 1466 ktime_t rxrpc_get_rto_backoff(struct rxrpc_call *call, bool retrans); 1467 void rxrpc_call_init_rtt(struct rxrpc_call *call); 1468 1469 /* 1470 * rxgk.c 1471 */ 1472 extern const struct rxrpc_security rxgk_yfs; 1473 1474 /* 1475 * rxkad.c 1476 */ 1477 #ifdef CONFIG_RXKAD 1478 extern const struct rxrpc_security rxkad; 1479 #endif 1480 1481 /* 1482 * security.c 1483 */ 1484 int __init rxrpc_init_security(void); 1485 const struct rxrpc_security *rxrpc_security_lookup(u8); 1486 void rxrpc_exit_security(void); 1487 int rxrpc_init_client_call_security(struct rxrpc_call *); 1488 int rxrpc_init_client_conn_security(struct rxrpc_connection *); 1489 const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *, 1490 struct sk_buff *); 1491 struct key *rxrpc_look_up_server_security(struct rxrpc_connection *, 1492 struct sk_buff *, u32, u32); 1493 1494 /* 1495 * sendmsg.c 1496 */ 1497 bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error, 1498 enum rxrpc_abort_reason why); 1499 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t); 1500 1501 /* 1502 * server_key.c 1503 */ 1504 extern struct key_type key_type_rxrpc_s; 1505 1506 int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int); 1507 1508 /* 1509 * skbuff.c 1510 */ 1511 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *); 1512 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace); 1513 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace); 1514 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace); 1515 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace); 1516 void rxrpc_purge_queue(struct sk_buff_head *); 1517 1518 /* 1519 * stats.c 1520 */ 1521 int rxrpc_stats_show(struct seq_file *seq, void *v); 1522 int rxrpc_stats_clear(struct file *file, char *buf, size_t size); 1523 1524 #define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s) 1525 #define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s) 1526 1527 /* 1528 * sysctl.c 1529 */ 1530 #ifdef CONFIG_SYSCTL 1531 extern int __init rxrpc_sysctl_init(void); 1532 extern void rxrpc_sysctl_exit(void); 1533 #else 1534 static inline int __init rxrpc_sysctl_init(void) { return 0; } 1535 static inline void rxrpc_sysctl_exit(void) {} 1536 #endif 1537 1538 /* 1539 * txbuf.c 1540 */ 1541 extern atomic_t rxrpc_nr_txbuf; 1542 struct rxrpc_txbuf *rxrpc_alloc_data_txbuf(struct rxrpc_call *call, size_t data_size, 1543 size_t data_align, gfp_t gfp); 1544 void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1545 void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1546 1547 /* 1548 * utils.c 1549 */ 1550 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *); 1551 1552 static inline bool before(u32 seq1, u32 seq2) 1553 { 1554 return (s32)(seq1 - seq2) < 0; 1555 } 1556 static inline bool before_eq(u32 seq1, u32 seq2) 1557 { 1558 return (s32)(seq1 - seq2) <= 0; 1559 } 1560 static inline bool after(u32 seq1, u32 seq2) 1561 { 1562 return (s32)(seq1 - seq2) > 0; 1563 } 1564 static inline bool after_eq(u32 seq1, u32 seq2) 1565 { 1566 return (s32)(seq1 - seq2) >= 0; 1567 } 1568 1569 static inline u32 earliest(u32 seq1, u32 seq2) 1570 { 1571 return before(seq1, seq2) ? seq1 : seq2; 1572 } 1573 1574 static inline u32 latest(u32 seq1, u32 seq2) 1575 { 1576 return after(seq1, seq2) ? seq1 : seq2; 1577 } 1578 1579 static inline bool rxrpc_seq_in_txq(const struct rxrpc_txqueue *tq, rxrpc_seq_t seq) 1580 { 1581 return (seq & (RXRPC_NR_TXQUEUE - 1)) == tq->qbase; 1582 } 1583 1584 static inline void rxrpc_queue_rx_call_packet(struct rxrpc_call *call, struct sk_buff *skb) 1585 { 1586 rxrpc_get_skb(skb, rxrpc_skb_get_call_rx); 1587 __skb_queue_tail(&call->rx_queue, skb); 1588 rxrpc_poke_call(call, rxrpc_call_poke_rx_packet); 1589 } 1590 1591 /* 1592 * Calculate how much space there is for transmitting more DATA packets. 1593 */ 1594 static inline unsigned int rxrpc_tx_window_space(const struct rxrpc_call *call) 1595 { 1596 int winsize = umin(call->tx_winsize, call->cong_cwnd + call->cong_extra); 1597 int transmitted = call->tx_top - call->tx_bottom; 1598 1599 return max(winsize - transmitted, 0); 1600 } 1601 1602 static inline unsigned int rxrpc_left_out(const struct rxrpc_call *call) 1603 { 1604 return call->acks_nr_sacks + call->tx_nr_lost; 1605 } 1606 1607 /* 1608 * Calculate the number of transmitted DATA packets assumed to be in flight 1609 * [approx RFC6675]. 1610 */ 1611 static inline unsigned int rxrpc_tx_in_flight(const struct rxrpc_call *call) 1612 { 1613 return call->tx_nr_sent - rxrpc_left_out(call) + call->tx_nr_resent; 1614 } 1615 1616 /* 1617 * debug tracing 1618 */ 1619 extern unsigned int rxrpc_debug; 1620 1621 #define dbgprintk(FMT,...) \ 1622 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1623 1624 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1625 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1626 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1627 1628 1629 #if defined(__KDEBUG) 1630 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1631 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1632 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1633 1634 #elif defined(CONFIG_AF_RXRPC_DEBUG) 1635 #define RXRPC_DEBUG_KENTER 0x01 1636 #define RXRPC_DEBUG_KLEAVE 0x02 1637 #define RXRPC_DEBUG_KDEBUG 0x04 1638 1639 #define _enter(FMT,...) \ 1640 do { \ 1641 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \ 1642 kenter(FMT,##__VA_ARGS__); \ 1643 } while (0) 1644 1645 #define _leave(FMT,...) \ 1646 do { \ 1647 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \ 1648 kleave(FMT,##__VA_ARGS__); \ 1649 } while (0) 1650 1651 #define _debug(FMT,...) \ 1652 do { \ 1653 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \ 1654 kdebug(FMT,##__VA_ARGS__); \ 1655 } while (0) 1656 1657 #else 1658 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1659 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1660 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1661 #endif 1662 1663 /* 1664 * debug assertion checking 1665 */ 1666 #if 1 // defined(__KDEBUGALL) 1667 1668 #define ASSERT(X) \ 1669 do { \ 1670 if (unlikely(!(X))) { \ 1671 pr_err("Assertion failed\n"); \ 1672 BUG(); \ 1673 } \ 1674 } while (0) 1675 1676 #define ASSERTCMP(X, OP, Y) \ 1677 do { \ 1678 __typeof__(X) _x = (X); \ 1679 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1680 if (unlikely(!(_x OP _y))) { \ 1681 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1682 (unsigned long)_x, (unsigned long)_x, #OP, \ 1683 (unsigned long)_y, (unsigned long)_y); \ 1684 BUG(); \ 1685 } \ 1686 } while (0) 1687 1688 #define ASSERTIF(C, X) \ 1689 do { \ 1690 if (unlikely((C) && !(X))) { \ 1691 pr_err("Assertion failed\n"); \ 1692 BUG(); \ 1693 } \ 1694 } while (0) 1695 1696 #define ASSERTIFCMP(C, X, OP, Y) \ 1697 do { \ 1698 __typeof__(X) _x = (X); \ 1699 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1700 if (unlikely((C) && !(_x OP _y))) { \ 1701 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1702 (unsigned long)_x, (unsigned long)_x, #OP, \ 1703 (unsigned long)_y, (unsigned long)_y); \ 1704 BUG(); \ 1705 } \ 1706 } while (0) 1707 1708 #else 1709 1710 #define ASSERT(X) \ 1711 do { \ 1712 } while (0) 1713 1714 #define ASSERTCMP(X, OP, Y) \ 1715 do { \ 1716 } while (0) 1717 1718 #define ASSERTIF(C, X) \ 1719 do { \ 1720 } while (0) 1721 1722 #define ASSERTIFCMP(C, X, OP, Y) \ 1723 do { \ 1724 } while (0) 1725 1726 #endif /* __KDEBUGALL */ 1727