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_SEND_REQUEST, /* - client sending request phase */ 673 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */ 674 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */ 675 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */ 676 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */ 677 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */ 678 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */ 679 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */ 680 RXRPC_CALL_COMPLETE, /* - call complete */ 681 NR__RXRPC_CALL_STATES 682 }; 683 684 /* 685 * Call Tx congestion management modes. 686 */ 687 enum rxrpc_ca_state { 688 RXRPC_CA_SLOW_START, 689 RXRPC_CA_CONGEST_AVOIDANCE, 690 RXRPC_CA_PACKET_LOSS, 691 RXRPC_CA_FAST_RETRANSMIT, 692 NR__RXRPC_CA_STATES 693 } __mode(byte); 694 695 /* 696 * Current purpose of call RACK timer. According to the RACK-TLP protocol 697 * [RFC8985], the transmission timer (call->rack_timo_at) may only be used for 698 * one of these at once. 699 */ 700 enum rxrpc_rack_timer_mode { 701 RXRPC_CALL_RACKTIMER_OFF, /* Timer not running */ 702 RXRPC_CALL_RACKTIMER_RACK_REORDER, /* RACK reordering timer */ 703 RXRPC_CALL_RACKTIMER_TLP_PTO, /* TLP timeout */ 704 RXRPC_CALL_RACKTIMER_RTO, /* Retransmission timeout */ 705 } __mode(byte); 706 707 /* 708 * RxRPC call definition 709 * - matched by { connection, call_id } 710 */ 711 struct rxrpc_call { 712 struct rcu_head rcu; 713 struct rxrpc_connection *conn; /* connection carrying call */ 714 struct rxrpc_bundle *bundle; /* Connection bundle to use */ 715 struct rxrpc_peer *peer; /* Peer record for remote address */ 716 struct rxrpc_local *local; /* Representation of local endpoint */ 717 struct rxrpc_sock __rcu *socket; /* socket responsible */ 718 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ 719 struct key *key; /* Security details */ 720 const struct rxrpc_security *security; /* applied security module */ 721 struct mutex user_mutex; /* User access mutex */ 722 struct sockaddr_rxrpc dest_srx; /* Destination address */ 723 ktime_t delay_ack_at; /* When DELAY ACK needs to happen */ 724 ktime_t rack_timo_at; /* When ACK is figured as lost */ 725 ktime_t ping_at; /* When next to send a ping */ 726 ktime_t keepalive_at; /* When next to send a keepalive ping */ 727 ktime_t expect_rx_by; /* When we expect to get a packet by */ 728 ktime_t expect_req_by; /* When we expect to get a request DATA packet by */ 729 ktime_t expect_term_by; /* When we expect call termination by */ 730 u32 next_rx_timo; /* Timeout for next Rx packet (ms) */ 731 u32 next_req_timo; /* Timeout for next Rx request packet (ms) */ 732 u32 hard_timo; /* Maximum lifetime or 0 (s) */ 733 struct timer_list timer; /* Combined event timer */ 734 struct work_struct destroyer; /* In-process-context destroyer */ 735 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */ 736 struct list_head link; /* link in master call list */ 737 struct list_head wait_link; /* Link in local->new_client_calls */ 738 struct hlist_node error_link; /* link in error distribution list */ 739 struct list_head accept_link; /* Link in rx->acceptq */ 740 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */ 741 struct list_head sock_link; /* Link in rx->sock_calls */ 742 struct rb_node sock_node; /* Node in rx->calls */ 743 struct list_head attend_link; /* Link in local->call_attend_q */ 744 struct rxrpc_txbuf *tx_pending; /* Tx buffer being filled */ 745 wait_queue_head_t waitq; /* Wait queue for channel or Tx */ 746 s64 tx_total_len; /* Total length left to be transmitted (or -1) */ 747 unsigned long user_call_ID; /* user-defined call ID */ 748 unsigned long flags; 749 unsigned long events; 750 spinlock_t notify_lock; /* Kernel notification lock */ 751 unsigned int send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */ 752 s32 send_abort; /* Abort code to be sent */ 753 short send_abort_err; /* Error to be associated with the abort */ 754 rxrpc_seq_t send_abort_seq; /* DATA packet that incurred the abort (or 0) */ 755 s32 abort_code; /* Local/remote abort code */ 756 int error; /* Local error incurred */ 757 enum rxrpc_call_state _state; /* Current state of call (needs barrier) */ 758 enum rxrpc_call_completion completion; /* Call completion condition */ 759 refcount_t ref; 760 u8 security_ix; /* Security type */ 761 enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */ 762 u32 call_id; /* call ID on connection */ 763 u32 cid; /* connection ID plus channel index */ 764 u32 security_level; /* Security level selected */ 765 u32 security_enctype; /* Security-specific encoding type (or 0) */ 766 int debug_id; /* debug ID for printks */ 767 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */ 768 unsigned short rx_pkt_len; /* Current recvmsg packet len */ 769 770 /* Sendmsg data tracking. */ 771 rxrpc_seq_t send_top; /* Highest Tx slot filled by sendmsg. */ 772 struct rxrpc_txqueue *send_queue; /* Queue that sendmsg is writing into */ 773 774 /* Transmitted data tracking. */ 775 struct rxrpc_txqueue *tx_queue; /* Start of transmission buffers */ 776 struct rxrpc_txqueue *tx_qtail; /* End of transmission buffers */ 777 rxrpc_seq_t tx_qbase; /* First slot in tx_queue */ 778 rxrpc_seq_t tx_bottom; /* First packet in buffer */ 779 rxrpc_seq_t tx_transmitted; /* Highest packet transmitted */ 780 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */ 781 rxrpc_serial_t tx_last_serial; /* Serial of last DATA transmitted */ 782 u16 tx_backoff; /* Delay to insert due to Tx failure (ms) */ 783 u16 tx_nr_sent; /* Number of packets sent, but unacked */ 784 u16 tx_nr_lost; /* Number of packets marked lost */ 785 u16 tx_nr_resent; /* Number of packets resent, but unacked */ 786 u16 tx_winsize; /* Maximum size of Tx window */ 787 #define RXRPC_TX_MAX_WINDOW 128 788 u8 tx_jumbo_max; /* Maximum subpkts peer will accept */ 789 ktime_t tx_last_sent; /* Last time a transmission occurred */ 790 791 /* Received data tracking */ 792 struct sk_buff_head recvmsg_queue; /* Queue of packets ready for recvmsg() */ 793 struct sk_buff_head rx_queue; /* Queue of packets for this call to receive */ 794 struct sk_buff_head rx_oos_queue; /* Queue of out of sequence packets */ 795 void *rx_dec_buffer; /* Decryption buffer */ 796 unsigned short rx_dec_bsize; /* rx_dec_buffer size */ 797 unsigned short rx_dec_offset; /* Decrypted packet data offset */ 798 unsigned short rx_dec_len; /* Decrypted packet data len */ 799 rxrpc_seq_t rx_dec_seq; /* Packet in decryption buffer */ 800 801 rxrpc_seq_t rx_highest_seq; /* Higest sequence number received */ 802 rxrpc_seq_t rx_consumed; /* Highest packet consumed */ 803 rxrpc_serial_t rx_serial; /* Highest serial received for this call */ 804 u8 rx_winsize; /* Size of Rx window */ 805 806 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS 807 * is fixed, we keep these numbers in terms of segments (ie. DATA 808 * packets) rather than bytes. 809 */ 810 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN 811 #define RXRPC_MIN_CWND 4 812 enum rxrpc_ca_state cong_ca_state; /* Congestion control state */ 813 u8 cong_extra; /* Extra to send for congestion management */ 814 u16 cong_cwnd; /* Congestion window size */ 815 u16 cong_ssthresh; /* Slow-start threshold */ 816 u16 cong_dup_acks; /* Count of ACKs showing missing packets */ 817 u16 cong_cumul_acks; /* Cumulative ACK count */ 818 ktime_t cong_tstamp; /* Last time cwnd was changed */ 819 820 /* RACK-TLP [RFC8985] state. */ 821 ktime_t rack_xmit_ts; /* Latest transmission timestamp */ 822 ktime_t rack_rtt; /* RTT of most recently ACK'd segment */ 823 ktime_t rack_rtt_ts; /* Timestamp of rack_rtt */ 824 ktime_t rack_reo_wnd; /* Reordering window */ 825 unsigned int rack_reo_wnd_mult; /* Multiplier applied to rack_reo_wnd */ 826 int rack_reo_wnd_persist; /* Num loss recoveries before reset reo_wnd */ 827 rxrpc_seq_t rack_fack; /* Highest sequence so far ACK'd */ 828 rxrpc_seq_t rack_end_seq; /* Highest sequence seen */ 829 rxrpc_seq_t rack_dsack_round; /* DSACK opt recv'd in latest roundtrip */ 830 bool rack_dsack_round_none; /* T if dsack_round is "None" */ 831 bool rack_reordering_seen; /* T if detected reordering event */ 832 enum rxrpc_rack_timer_mode rack_timer_mode; /* Current mode of RACK timer */ 833 bool tlp_is_retrans; /* T if unacked TLP retransmission */ 834 rxrpc_serial_t tlp_serial; /* Serial of TLP probe (or 0 if none in progress) */ 835 rxrpc_seq_t tlp_seq; /* Sequence of TLP probe */ 836 unsigned int tlp_rtt_taken; /* Last time RTT taken */ 837 ktime_t tlp_max_ack_delay; /* Sender budget for max delayed ACK interval */ 838 839 /* Receive-phase ACK management (ACKs we send). */ 840 u8 ackr_reason; /* reason to ACK */ 841 u16 ackr_sack_base; /* Starting slot in SACK table ring */ 842 rxrpc_seq_t ackr_window; /* Base of SACK window */ 843 rxrpc_seq_t ackr_wtop; /* Base of SACK window */ 844 unsigned int ackr_nr_unacked; /* Number of unacked packets */ 845 atomic_t ackr_nr_consumed; /* Number of packets needing hard ACK */ 846 struct { 847 #define RXRPC_SACK_SIZE 256 848 /* SACK table for soft-acked packets */ 849 u8 ackr_sack_table[RXRPC_SACK_SIZE]; 850 } __aligned(8); 851 852 /* RTT management */ 853 rxrpc_serial_t rtt_serial[4]; /* Serial number of DATA or PING sent */ 854 ktime_t rtt_sent_at[4]; /* Time packet sent */ 855 unsigned long rtt_avail; /* Mask of available slots in bits 0-3, 856 * Mask of pending samples in 8-11 */ 857 #define RXRPC_CALL_RTT_AVAIL_MASK 0xf 858 #define RXRPC_CALL_RTT_PEND_SHIFT 8 859 860 /* Transmission-phase ACK management (ACKs we've received). */ 861 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */ 862 rxrpc_seq_t acks_hard_ack; /* Highest sequence hard acked */ 863 rxrpc_seq_t acks_prev_seq; /* Highest previousPacket received */ 864 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */ 865 rxrpc_serial_t acks_highest_serial; /* Highest serial number ACK'd */ 866 unsigned short acks_nr_sacks; /* Number of soft acks recorded */ 867 unsigned short acks_nr_snacks; /* Number of soft nacks recorded */ 868 869 /* Calculated RTT cache */ 870 ktime_t rtt_last_req; /* Time of last RTT request */ 871 unsigned int rtt_count; /* Number of samples we've got */ 872 unsigned int rtt_taken; /* Number of samples taken (wrapping) */ 873 struct minmax min_rtt; /* Estimated minimum RTT */ 874 u32 srtt_us; /* smoothed round trip time << 3 in usecs */ 875 u32 mdev_us; /* medium deviation */ 876 u32 mdev_max_us; /* maximal mdev for the last rtt period */ 877 u32 rttvar_us; /* smoothed mdev_max */ 878 u32 rto_us; /* Retransmission timeout in usec */ 879 u8 backoff; /* Backoff timeout (as shift) */ 880 }; 881 882 /* 883 * Summary of a new ACK and the changes it made to the Tx buffer packet states. 884 */ 885 struct rxrpc_ack_summary { 886 rxrpc_serial_t ack_serial; /* Serial number of ACK */ 887 rxrpc_serial_t acked_serial; /* Serial number ACK'd */ 888 u16 in_flight; /* Number of unreceived transmissions */ 889 u16 nr_new_hacks; /* Number of rotated new ACKs */ 890 u16 nr_new_sacks; /* Number of new soft ACKs in packet */ 891 u16 nr_new_snacks; /* Number of new soft nacks in packet */ 892 u8 ack_reason; 893 bool new_low_snack:1; /* T if new low soft NACK found */ 894 bool retrans_timeo:1; /* T if reTx due to timeout happened */ 895 bool need_retransmit:1; /* T if we need transmission */ 896 bool rtt_sample_avail:1; /* T if RTT sample available */ 897 bool in_fast_or_rto_recovery:1; 898 bool exiting_fast_or_rto_recovery:1; 899 bool tlp_probe_acked:1; /* T if the TLP probe seq was acked */ 900 u8 /*enum rxrpc_congest_change*/ change; 901 }; 902 903 /* 904 * sendmsg() cmsg-specified parameters. 905 */ 906 enum rxrpc_command { 907 RXRPC_CMD_SEND_DATA, /* send data message */ 908 RXRPC_CMD_SEND_ABORT, /* request abort generation */ 909 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */ 910 RXRPC_CMD_CHARGE_ACCEPT, /* [server] charge accept preallocation */ 911 }; 912 913 struct rxrpc_call_params { 914 s64 tx_total_len; /* Total Tx data length (if send data) */ 915 unsigned long user_call_ID; /* User's call ID */ 916 struct { 917 u32 hard; /* Maximum lifetime (sec) */ 918 u32 idle; /* Max time since last data packet (msec) */ 919 u32 normal; /* Max time since last call packet (msec) */ 920 } timeouts; 921 u8 nr_timeouts; /* Number of timeouts specified */ 922 bool kernel; /* T if kernel is making the call */ 923 enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */ 924 }; 925 926 struct rxrpc_send_params { 927 struct rxrpc_call_params call; 928 u32 abort_code; /* Abort code to Tx (if abort) */ 929 enum rxrpc_command command : 8; /* The command to implement */ 930 bool exclusive; /* Shared or exclusive call */ 931 bool upgrade; /* If the connection is upgradeable */ 932 }; 933 934 /* 935 * Buffer of data to be output as a packet. 936 */ 937 struct rxrpc_txbuf { 938 refcount_t ref; 939 rxrpc_seq_t seq; /* Sequence number of this packet */ 940 rxrpc_serial_t serial; /* Last serial number transmitted with */ 941 unsigned int call_debug_id; 942 unsigned int debug_id; 943 unsigned short len; /* Amount of data in buffer */ 944 unsigned short space; /* Remaining data space */ 945 unsigned short offset; /* Offset of fill point */ 946 unsigned short crypto_header; /* Size of crypto header */ 947 unsigned short sec_header; /* Size of security header */ 948 unsigned short pkt_len; /* Size of packet content */ 949 unsigned short alloc_size; /* Amount of bufferage allocated */ 950 unsigned int flags; 951 #define RXRPC_TXBUF_WIRE_FLAGS 0xff /* The wire protocol flags */ 952 #define RXRPC_TXBUF_RESENT 0x100 /* Set if has been resent */ 953 __be16 cksum; /* Checksum to go in header */ 954 bool jumboable; /* Can be non-terminal jumbo subpacket */ 955 void *data; /* Data with preceding jumbo header */ 956 }; 957 958 static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb) 959 { 960 return txb->flags & RXRPC_CLIENT_INITIATED; 961 } 962 963 static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb) 964 { 965 return !rxrpc_sending_to_server(txb); 966 } 967 968 /* 969 * Transmit queue element, including RACK [RFC8985] per-segment metadata. The 970 * transmission timestamp is in usec from the base. 971 */ 972 struct rxrpc_txqueue { 973 /* Start with the members we want to prefetch. */ 974 struct rxrpc_txqueue *next; 975 ktime_t xmit_ts_base; 976 rxrpc_seq_t qbase; 977 u8 nr_reported_acks; /* Number of segments explicitly acked/nacked */ 978 unsigned long segment_acked; /* Bit-per-buf: Set if ACK'd */ 979 unsigned long segment_lost; /* Bit-per-buf: Set if declared lost */ 980 unsigned long segment_retransmitted; /* Bit-per-buf: Set if retransmitted */ 981 unsigned long rtt_samples; /* Bit-per-buf: Set if available for RTT */ 982 unsigned long ever_retransmitted; /* Bit-per-buf: Set if ever retransmitted */ 983 984 /* The arrays we want to pack into as few cache lines as possible. */ 985 struct { 986 #define RXRPC_NR_TXQUEUE BITS_PER_LONG 987 #define RXRPC_TXQ_MASK (RXRPC_NR_TXQUEUE - 1) 988 struct rxrpc_txbuf *bufs[RXRPC_NR_TXQUEUE]; 989 unsigned int segment_serial[RXRPC_NR_TXQUEUE]; 990 unsigned int segment_xmit_ts[RXRPC_NR_TXQUEUE]; 991 } ____cacheline_aligned; 992 }; 993 994 /* 995 * Data transmission request. 996 */ 997 struct rxrpc_send_data_req { 998 ktime_t now; /* Current time */ 999 struct rxrpc_txqueue *tq; /* Tx queue segment holding first DATA */ 1000 rxrpc_seq_t seq; /* Sequence of first data */ 1001 int n; /* Number of DATA packets to glue into jumbo */ 1002 bool retrans; /* T if this is a retransmission */ 1003 bool did_send; /* T if did actually send */ 1004 bool tlp_probe; /* T if this is a TLP probe */ 1005 int /* enum rxrpc_txdata_trace */ trace; 1006 }; 1007 1008 #include <trace/events/rxrpc.h> 1009 1010 /* 1011 * Allocate the next serial number on a connection. 0 must be skipped. 1012 */ 1013 static inline rxrpc_serial_t rxrpc_get_next_serial(struct rxrpc_connection *conn) 1014 { 1015 rxrpc_serial_t serial; 1016 1017 serial = conn->tx_serial; 1018 if (serial == 0) 1019 serial = 1; 1020 conn->tx_serial = serial + 1; 1021 return serial; 1022 } 1023 1024 /* 1025 * Allocate the next serial n numbers on a connection. 0 must be skipped. 1026 */ 1027 static inline rxrpc_serial_t rxrpc_get_next_serials(struct rxrpc_connection *conn, 1028 unsigned int n) 1029 { 1030 rxrpc_serial_t serial; 1031 1032 serial = conn->tx_serial; 1033 if (serial + n <= n) 1034 serial = 1; 1035 conn->tx_serial = serial + n; 1036 return serial; 1037 } 1038 1039 /* 1040 * af_rxrpc.c 1041 */ 1042 extern atomic_t rxrpc_n_rx_skbs; 1043 extern struct workqueue_struct *rxrpc_workqueue; 1044 1045 /* 1046 * call_accept.c 1047 */ 1048 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t); 1049 void rxrpc_discard_prealloc(struct rxrpc_sock *); 1050 bool rxrpc_new_incoming_call(struct rxrpc_local *local, 1051 struct rxrpc_peer *peer, 1052 struct rxrpc_connection *conn, 1053 struct sockaddr_rxrpc *peer_srx, 1054 struct sk_buff *skb); 1055 int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long); 1056 1057 /* 1058 * call_event.c 1059 */ 1060 void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial, 1061 enum rxrpc_propose_ack_trace why); 1062 void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t, 1063 enum rxrpc_propose_ack_trace); 1064 void rxrpc_resend_tlp(struct rxrpc_call *call); 1065 void rxrpc_transmit_some_data(struct rxrpc_call *call, unsigned int limit, 1066 enum rxrpc_txdata_trace trace); 1067 bool rxrpc_input_call_event(struct rxrpc_call *call); 1068 1069 /* 1070 * call_object.c 1071 */ 1072 extern const char *const rxrpc_call_states[]; 1073 extern const char *const rxrpc_call_completions[]; 1074 extern struct kmem_cache *rxrpc_call_jar; 1075 1076 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what); 1077 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long); 1078 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int); 1079 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *, 1080 struct rxrpc_conn_parameters *, 1081 struct rxrpc_call_params *, gfp_t, 1082 unsigned int) 1083 __releases(&rx->sk.sk_lock) 1084 __acquires(&call->user_mutex); 1085 void rxrpc_start_call_timer(struct rxrpc_call *call); 1086 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *, 1087 struct sk_buff *); 1088 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *); 1089 void rxrpc_release_calls_on_socket(struct rxrpc_sock *); 1090 void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace); 1091 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 1092 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 1093 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace); 1094 void rxrpc_cleanup_call(struct rxrpc_call *); 1095 void rxrpc_destroy_all_calls(struct rxrpc_net *); 1096 1097 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call) 1098 { 1099 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags); 1100 } 1101 1102 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call) 1103 { 1104 return !rxrpc_is_service_call(call); 1105 } 1106 1107 /* 1108 * call_state.c 1109 */ 1110 bool rxrpc_set_call_completion(struct rxrpc_call *call, 1111 enum rxrpc_call_completion compl, 1112 u32 abort_code, 1113 int error); 1114 bool rxrpc_call_completed(struct rxrpc_call *call); 1115 bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq, 1116 u32 abort_code, int error, enum rxrpc_abort_reason why); 1117 void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl, 1118 int error); 1119 1120 static inline void rxrpc_set_call_state(struct rxrpc_call *call, 1121 enum rxrpc_call_state state) 1122 { 1123 /* Order write of completion info before write of ->state. */ 1124 smp_store_release(&call->_state, state); 1125 wake_up(&call->waitq); 1126 } 1127 1128 static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call) 1129 { 1130 return call->_state; /* Only inside I/O thread */ 1131 } 1132 1133 static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call) 1134 { 1135 return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; 1136 } 1137 1138 static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call) 1139 { 1140 /* Order read ->state before read of completion info. */ 1141 return smp_load_acquire(&call->_state); 1142 } 1143 1144 static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call) 1145 { 1146 return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; 1147 } 1148 1149 static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call) 1150 { 1151 return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED; 1152 } 1153 1154 /* 1155 * conn_client.c 1156 */ 1157 extern unsigned int rxrpc_reap_client_connections; 1158 extern unsigned long rxrpc_conn_idle_client_expiry; 1159 extern unsigned long rxrpc_conn_idle_client_fast_expiry; 1160 1161 void rxrpc_purge_client_connections(struct rxrpc_local *local); 1162 struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 1163 void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 1164 int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp); 1165 void rxrpc_connect_client_calls(struct rxrpc_local *local); 1166 void rxrpc_expose_client_call(struct rxrpc_call *); 1167 void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *); 1168 void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle); 1169 void rxrpc_discard_expired_client_conns(struct rxrpc_local *local); 1170 void rxrpc_clean_up_local_conns(struct rxrpc_local *); 1171 1172 /* 1173 * conn_event.c 1174 */ 1175 void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb, 1176 unsigned int channel); 1177 int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb, 1178 s32 abort_code, int err, enum rxrpc_abort_reason why); 1179 void rxrpc_process_connection(struct work_struct *); 1180 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool); 1181 bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb); 1182 void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb); 1183 1184 static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn) 1185 { 1186 /* Order reading the abort info after the state check. */ 1187 return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED; 1188 } 1189 1190 /* 1191 * conn_object.c 1192 */ 1193 extern unsigned int rxrpc_connection_expiry; 1194 extern unsigned int rxrpc_closed_conn_expiry; 1195 1196 void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why); 1197 struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t); 1198 struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *, 1199 struct sockaddr_rxrpc *, 1200 struct sk_buff *); 1201 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *); 1202 void rxrpc_disconnect_call(struct rxrpc_call *); 1203 void rxrpc_kill_client_conn(struct rxrpc_connection *); 1204 void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace); 1205 void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 1206 struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *, 1207 enum rxrpc_conn_trace); 1208 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *, 1209 enum rxrpc_conn_trace); 1210 void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 1211 void rxrpc_service_connection_reaper(struct work_struct *); 1212 void rxrpc_destroy_all_connections(struct rxrpc_net *); 1213 1214 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn) 1215 { 1216 return conn->out_clientflag; 1217 } 1218 1219 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn) 1220 { 1221 return !rxrpc_conn_is_client(conn); 1222 } 1223 1224 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn, 1225 unsigned long expire_at) 1226 { 1227 timer_reduce(&conn->timer, expire_at); 1228 } 1229 1230 /* 1231 * conn_service.c 1232 */ 1233 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *, 1234 struct sk_buff *); 1235 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t); 1236 void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *, 1237 const struct rxrpc_security *, struct sk_buff *); 1238 void rxrpc_unpublish_service_conn(struct rxrpc_connection *); 1239 1240 /* 1241 * input.c 1242 */ 1243 void rxrpc_congestion_degrade(struct rxrpc_call *); 1244 void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *); 1245 void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *); 1246 1247 /* 1248 * input_rack.c 1249 */ 1250 void rxrpc_input_rack_one(struct rxrpc_call *call, 1251 struct rxrpc_ack_summary *summary, 1252 struct rxrpc_txqueue *tq, 1253 unsigned int ix); 1254 void rxrpc_input_rack(struct rxrpc_call *call, 1255 struct rxrpc_ack_summary *summary, 1256 struct rxrpc_txqueue *tq, 1257 unsigned long new_acks); 1258 void rxrpc_rack_detect_loss_and_arm_timer(struct rxrpc_call *call, 1259 struct rxrpc_ack_summary *summary); 1260 ktime_t rxrpc_tlp_calc_pto(struct rxrpc_call *call, ktime_t now); 1261 void rxrpc_tlp_send_probe(struct rxrpc_call *call); 1262 void rxrpc_tlp_process_ack(struct rxrpc_call *call, struct rxrpc_ack_summary *summary); 1263 void rxrpc_rack_timer_expired(struct rxrpc_call *call, ktime_t overran_by); 1264 1265 /* Initialise TLP state [RFC8958 7.1]. */ 1266 static inline void rxrpc_tlp_init(struct rxrpc_call *call) 1267 { 1268 call->tlp_serial = 0; 1269 call->tlp_seq = call->acks_hard_ack; 1270 call->tlp_is_retrans = false; 1271 } 1272 1273 /* 1274 * io_thread.c 1275 */ 1276 int rxrpc_encap_rcv(struct sock *, struct sk_buff *); 1277 void rxrpc_error_report(struct sock *); 1278 bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why, 1279 s32 abort_code, int err); 1280 bool rxrpc_direct_conn_abort(struct sk_buff *skb, enum rxrpc_abort_reason why, 1281 s32 abort_code, int err); 1282 int rxrpc_io_thread(void *data); 1283 void rxrpc_post_response(struct rxrpc_connection *conn, struct sk_buff *skb); 1284 static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local) 1285 { 1286 if (!local->io_thread) 1287 return; 1288 wake_up_process(READ_ONCE(local->io_thread)); 1289 } 1290 1291 static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why) 1292 { 1293 return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO); 1294 } 1295 1296 /* 1297 * insecure.c 1298 */ 1299 extern const struct rxrpc_security rxrpc_no_security; 1300 1301 /* 1302 * key.c 1303 */ 1304 extern struct key_type key_type_rxrpc; 1305 1306 int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int); 1307 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t, 1308 u32); 1309 1310 /* 1311 * local_event.c 1312 */ 1313 void rxrpc_gen_version_string(void); 1314 void rxrpc_send_version_request(struct rxrpc_local *local, 1315 struct rxrpc_host_header *hdr, 1316 struct sk_buff *skb); 1317 1318 /* 1319 * local_object.c 1320 */ 1321 void rxrpc_local_dont_fragment(const struct rxrpc_local *local, bool set); 1322 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *); 1323 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace); 1324 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace); 1325 void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace); 1326 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace); 1327 void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace); 1328 void rxrpc_destroy_local(struct rxrpc_local *local); 1329 void rxrpc_destroy_all_locals(struct rxrpc_net *); 1330 1331 static inline bool __rxrpc_use_local(struct rxrpc_local *local, 1332 enum rxrpc_local_trace why) 1333 { 1334 int r, u; 1335 1336 r = refcount_read(&local->ref); 1337 u = atomic_fetch_add_unless(&local->active_users, 1, 0); 1338 trace_rxrpc_local(local->debug_id, why, r, u); 1339 return u != 0; 1340 } 1341 1342 static inline void rxrpc_see_local(struct rxrpc_local *local, 1343 enum rxrpc_local_trace why) 1344 { 1345 int r, u; 1346 1347 r = refcount_read(&local->ref); 1348 u = atomic_read(&local->active_users); 1349 trace_rxrpc_local(local->debug_id, why, r, u); 1350 } 1351 1352 /* 1353 * misc.c 1354 */ 1355 extern unsigned int rxrpc_max_backlog __read_mostly; 1356 extern unsigned long rxrpc_soft_ack_delay; 1357 extern unsigned long rxrpc_idle_ack_delay; 1358 extern unsigned int rxrpc_rx_window_size; 1359 extern unsigned int rxrpc_rx_mtu; 1360 extern unsigned int rxrpc_rx_jumbo_max; 1361 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY 1362 extern unsigned long rxrpc_inject_rx_delay; 1363 #endif 1364 1365 /* 1366 * net_ns.c 1367 */ 1368 extern unsigned int rxrpc_net_id; 1369 extern struct pernet_operations rxrpc_net_ops; 1370 1371 static inline struct rxrpc_net *rxrpc_net(struct net *net) 1372 { 1373 return net_generic(net, rxrpc_net_id); 1374 } 1375 1376 /* 1377 * out_of_band.c 1378 */ 1379 void rxrpc_notify_socket_oob(struct rxrpc_call *call, struct sk_buff *skb); 1380 void rxrpc_add_pending_oob(struct rxrpc_sock *rx, struct sk_buff *skb); 1381 int rxrpc_sendmsg_oob(struct rxrpc_sock *rx, struct msghdr *msg, size_t len); 1382 1383 /* 1384 * output.c 1385 */ 1386 ssize_t do_udp_sendmsg(struct socket *socket, struct msghdr *msg, size_t len); 1387 void rxrpc_send_ACK(struct rxrpc_call *call, u8 ack_reason, 1388 rxrpc_serial_t serial, enum rxrpc_propose_ack_trace why); 1389 void rxrpc_send_probe_for_pmtud(struct rxrpc_call *call); 1390 int rxrpc_send_abort_packet(struct rxrpc_call *); 1391 void rxrpc_send_data_packet(struct rxrpc_call *call, struct rxrpc_send_data_req *req); 1392 void rxrpc_send_conn_abort(struct rxrpc_connection *conn); 1393 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb); 1394 void rxrpc_send_keepalive(struct rxrpc_peer *); 1395 void rxrpc_send_response(struct rxrpc_connection *conn, struct sk_buff *skb); 1396 1397 /* 1398 * peer_event.c 1399 */ 1400 void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *); 1401 void rxrpc_peer_keepalive_worker(struct work_struct *); 1402 void rxrpc_input_probe_for_pmtud(struct rxrpc_connection *conn, rxrpc_serial_t acked_serial, 1403 bool sendmsg_fail); 1404 1405 /* Update the last transmission time on a peer for keepalive purposes. */ 1406 static inline void rxrpc_peer_mark_tx(struct rxrpc_peer *peer) 1407 { 1408 /* To avoid tearing on 32-bit systems, we only keep the LSW. */ 1409 WRITE_ONCE(peer->last_tx_at, ktime_get_seconds()); 1410 } 1411 1412 /* 1413 * peer_object.c 1414 */ 1415 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *, 1416 const struct sockaddr_rxrpc *); 1417 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local, 1418 struct sockaddr_rxrpc *srx, gfp_t gfp); 1419 void rxrpc_assess_MTU_size(struct rxrpc_local *local, struct rxrpc_peer *peer); 1420 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t, 1421 enum rxrpc_peer_trace); 1422 void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer); 1423 void rxrpc_destroy_all_peers(struct rxrpc_net *); 1424 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1425 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace); 1426 void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1427 1428 /* 1429 * proc.c 1430 */ 1431 extern const struct seq_operations rxrpc_call_seq_ops; 1432 extern const struct seq_operations rxrpc_connection_seq_ops; 1433 extern const struct seq_operations rxrpc_bundle_seq_ops; 1434 extern const struct seq_operations rxrpc_peer_seq_ops; 1435 extern const struct seq_operations rxrpc_local_seq_ops; 1436 1437 /* 1438 * recvmsg.c 1439 */ 1440 void rxrpc_notify_socket(struct rxrpc_call *); 1441 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int); 1442 1443 /* 1444 * Abort a call due to a protocol error. 1445 */ 1446 static inline int rxrpc_abort_eproto(struct rxrpc_call *call, 1447 struct sk_buff *skb, 1448 s32 abort_code, 1449 enum rxrpc_abort_reason why) 1450 { 1451 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 1452 1453 rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why); 1454 return -EPROTO; 1455 } 1456 1457 /* 1458 * rtt.c 1459 */ 1460 void rxrpc_call_add_rtt(struct rxrpc_call *call, enum rxrpc_rtt_rx_trace why, 1461 int rtt_slot, 1462 rxrpc_serial_t send_serial, rxrpc_serial_t resp_serial, 1463 ktime_t send_time, ktime_t resp_time); 1464 ktime_t rxrpc_get_rto_backoff(struct rxrpc_call *call, bool retrans); 1465 void rxrpc_call_init_rtt(struct rxrpc_call *call); 1466 1467 /* 1468 * rxgk.c 1469 */ 1470 extern const struct rxrpc_security rxgk_yfs; 1471 1472 /* 1473 * rxkad.c 1474 */ 1475 #ifdef CONFIG_RXKAD 1476 extern const struct rxrpc_security rxkad; 1477 #endif 1478 1479 /* 1480 * security.c 1481 */ 1482 int __init rxrpc_init_security(void); 1483 const struct rxrpc_security *rxrpc_security_lookup(u8); 1484 void rxrpc_exit_security(void); 1485 int rxrpc_init_client_call_security(struct rxrpc_call *); 1486 int rxrpc_init_client_conn_security(struct rxrpc_connection *); 1487 const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *, 1488 struct sk_buff *); 1489 struct key *rxrpc_look_up_server_security(struct rxrpc_connection *, 1490 struct sk_buff *, u32, u32); 1491 1492 /* 1493 * sendmsg.c 1494 */ 1495 bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error, 1496 enum rxrpc_abort_reason why); 1497 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t); 1498 1499 /* 1500 * server_key.c 1501 */ 1502 extern struct key_type key_type_rxrpc_s; 1503 1504 int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int); 1505 1506 /* 1507 * skbuff.c 1508 */ 1509 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *); 1510 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace); 1511 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace); 1512 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace); 1513 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace); 1514 void rxrpc_purge_queue(struct sk_buff_head *); 1515 1516 /* 1517 * stats.c 1518 */ 1519 int rxrpc_stats_show(struct seq_file *seq, void *v); 1520 int rxrpc_stats_clear(struct file *file, char *buf, size_t size); 1521 1522 #define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s) 1523 #define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s) 1524 1525 /* 1526 * sysctl.c 1527 */ 1528 #ifdef CONFIG_SYSCTL 1529 extern int __init rxrpc_sysctl_init(void); 1530 extern void rxrpc_sysctl_exit(void); 1531 #else 1532 static inline int __init rxrpc_sysctl_init(void) { return 0; } 1533 static inline void rxrpc_sysctl_exit(void) {} 1534 #endif 1535 1536 /* 1537 * txbuf.c 1538 */ 1539 extern atomic_t rxrpc_nr_txbuf; 1540 struct rxrpc_txbuf *rxrpc_alloc_data_txbuf(struct rxrpc_call *call, size_t data_size, 1541 size_t data_align, gfp_t gfp); 1542 void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1543 void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1544 1545 /* 1546 * utils.c 1547 */ 1548 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *); 1549 1550 static inline bool before(u32 seq1, u32 seq2) 1551 { 1552 return (s32)(seq1 - seq2) < 0; 1553 } 1554 static inline bool before_eq(u32 seq1, u32 seq2) 1555 { 1556 return (s32)(seq1 - seq2) <= 0; 1557 } 1558 static inline bool after(u32 seq1, u32 seq2) 1559 { 1560 return (s32)(seq1 - seq2) > 0; 1561 } 1562 static inline bool after_eq(u32 seq1, u32 seq2) 1563 { 1564 return (s32)(seq1 - seq2) >= 0; 1565 } 1566 1567 static inline u32 earliest(u32 seq1, u32 seq2) 1568 { 1569 return before(seq1, seq2) ? seq1 : seq2; 1570 } 1571 1572 static inline u32 latest(u32 seq1, u32 seq2) 1573 { 1574 return after(seq1, seq2) ? seq1 : seq2; 1575 } 1576 1577 static inline bool rxrpc_seq_in_txq(const struct rxrpc_txqueue *tq, rxrpc_seq_t seq) 1578 { 1579 return (seq & (RXRPC_NR_TXQUEUE - 1)) == tq->qbase; 1580 } 1581 1582 static inline void rxrpc_queue_rx_call_packet(struct rxrpc_call *call, struct sk_buff *skb) 1583 { 1584 rxrpc_get_skb(skb, rxrpc_skb_get_call_rx); 1585 __skb_queue_tail(&call->rx_queue, skb); 1586 rxrpc_poke_call(call, rxrpc_call_poke_rx_packet); 1587 } 1588 1589 /* 1590 * Calculate how much space there is for transmitting more DATA packets. 1591 */ 1592 static inline unsigned int rxrpc_tx_window_space(const struct rxrpc_call *call) 1593 { 1594 int winsize = umin(call->tx_winsize, call->cong_cwnd + call->cong_extra); 1595 int transmitted = call->tx_top - call->tx_bottom; 1596 1597 return max(winsize - transmitted, 0); 1598 } 1599 1600 static inline unsigned int rxrpc_left_out(const struct rxrpc_call *call) 1601 { 1602 return call->acks_nr_sacks + call->tx_nr_lost; 1603 } 1604 1605 /* 1606 * Calculate the number of transmitted DATA packets assumed to be in flight 1607 * [approx RFC6675]. 1608 */ 1609 static inline unsigned int rxrpc_tx_in_flight(const struct rxrpc_call *call) 1610 { 1611 return call->tx_nr_sent - rxrpc_left_out(call) + call->tx_nr_resent; 1612 } 1613 1614 /* 1615 * debug tracing 1616 */ 1617 extern unsigned int rxrpc_debug; 1618 1619 #define dbgprintk(FMT,...) \ 1620 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1621 1622 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1623 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1624 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1625 1626 1627 #if defined(__KDEBUG) 1628 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1629 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1630 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1631 1632 #elif defined(CONFIG_AF_RXRPC_DEBUG) 1633 #define RXRPC_DEBUG_KENTER 0x01 1634 #define RXRPC_DEBUG_KLEAVE 0x02 1635 #define RXRPC_DEBUG_KDEBUG 0x04 1636 1637 #define _enter(FMT,...) \ 1638 do { \ 1639 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \ 1640 kenter(FMT,##__VA_ARGS__); \ 1641 } while (0) 1642 1643 #define _leave(FMT,...) \ 1644 do { \ 1645 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \ 1646 kleave(FMT,##__VA_ARGS__); \ 1647 } while (0) 1648 1649 #define _debug(FMT,...) \ 1650 do { \ 1651 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \ 1652 kdebug(FMT,##__VA_ARGS__); \ 1653 } while (0) 1654 1655 #else 1656 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1657 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1658 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1659 #endif 1660 1661 /* 1662 * debug assertion checking 1663 */ 1664 #if 1 // defined(__KDEBUGALL) 1665 1666 #define ASSERT(X) \ 1667 do { \ 1668 if (unlikely(!(X))) { \ 1669 pr_err("Assertion failed\n"); \ 1670 BUG(); \ 1671 } \ 1672 } while (0) 1673 1674 #define ASSERTCMP(X, OP, Y) \ 1675 do { \ 1676 __typeof__(X) _x = (X); \ 1677 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1678 if (unlikely(!(_x OP _y))) { \ 1679 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1680 (unsigned long)_x, (unsigned long)_x, #OP, \ 1681 (unsigned long)_y, (unsigned long)_y); \ 1682 BUG(); \ 1683 } \ 1684 } while (0) 1685 1686 #define ASSERTIF(C, X) \ 1687 do { \ 1688 if (unlikely((C) && !(X))) { \ 1689 pr_err("Assertion failed\n"); \ 1690 BUG(); \ 1691 } \ 1692 } while (0) 1693 1694 #define ASSERTIFCMP(C, X, OP, Y) \ 1695 do { \ 1696 __typeof__(X) _x = (X); \ 1697 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1698 if (unlikely((C) && !(_x OP _y))) { \ 1699 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1700 (unsigned long)_x, (unsigned long)_x, #OP, \ 1701 (unsigned long)_y, (unsigned long)_y); \ 1702 BUG(); \ 1703 } \ 1704 } while (0) 1705 1706 #else 1707 1708 #define ASSERT(X) \ 1709 do { \ 1710 } while (0) 1711 1712 #define ASSERTCMP(X, OP, Y) \ 1713 do { \ 1714 } while (0) 1715 1716 #define ASSERTIF(C, X) \ 1717 do { \ 1718 } while (0) 1719 1720 #define ASSERTIFCMP(C, X, OP, Y) \ 1721 do { \ 1722 } while (0) 1723 1724 #endif /* __KDEBUGALL */ 1725