1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* AF_RXRPC internal definitions 3 * 4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 5 * Written by David Howells (dhowells@redhat.com) 6 */ 7 8 #include <linux/atomic.h> 9 #include <linux/seqlock.h> 10 #include <linux/win_minmax.h> 11 #include <net/net_namespace.h> 12 #include <net/netns/generic.h> 13 #include <net/sock.h> 14 #include <net/af_rxrpc.h> 15 #include <keys/rxrpc-type.h> 16 #include "protocol.h" 17 18 #define FCRYPT_BSIZE 8 19 struct rxrpc_crypt { 20 union { 21 u8 x[FCRYPT_BSIZE]; 22 __be32 n[2]; 23 }; 24 } __attribute__((aligned(8))); 25 26 #define rxrpc_queue_work(WS) queue_work(rxrpc_workqueue, (WS)) 27 #define rxrpc_queue_delayed_work(WS,D) \ 28 queue_delayed_work(rxrpc_workqueue, (WS), (D)) 29 30 struct key_preparsed_payload; 31 struct rxrpc_connection; 32 struct rxrpc_txbuf; 33 34 /* 35 * Mark applied to socket buffers in skb->mark. skb->priority is used 36 * to pass supplementary information. 37 */ 38 enum rxrpc_skb_mark { 39 RXRPC_SKB_MARK_PACKET, /* Received packet */ 40 RXRPC_SKB_MARK_ERROR, /* Error notification */ 41 RXRPC_SKB_MARK_SERVICE_CONN_SECURED, /* Service connection response has been verified */ 42 RXRPC_SKB_MARK_REJECT_BUSY, /* Reject with BUSY */ 43 RXRPC_SKB_MARK_REJECT_ABORT, /* Reject with ABORT (code in skb->priority) */ 44 }; 45 46 /* 47 * sk_state for RxRPC sockets 48 */ 49 enum { 50 RXRPC_UNBOUND = 0, 51 RXRPC_CLIENT_UNBOUND, /* Unbound socket used as client */ 52 RXRPC_CLIENT_BOUND, /* client local address bound */ 53 RXRPC_SERVER_BOUND, /* server local address bound */ 54 RXRPC_SERVER_BOUND2, /* second server local address bound */ 55 RXRPC_SERVER_LISTENING, /* server listening for connections */ 56 RXRPC_SERVER_LISTEN_DISABLED, /* server listening disabled */ 57 RXRPC_CLOSE, /* socket is being closed */ 58 }; 59 60 /* 61 * Per-network namespace data. 62 */ 63 struct rxrpc_net { 64 struct proc_dir_entry *proc_net; /* Subdir in /proc/net */ 65 u32 epoch; /* Local epoch for detecting local-end reset */ 66 struct list_head calls; /* List of calls active in this namespace */ 67 spinlock_t call_lock; /* Lock for ->calls */ 68 atomic_t nr_calls; /* Count of allocated calls */ 69 70 atomic_t nr_conns; 71 struct list_head bundle_proc_list; /* List of bundles for proc */ 72 struct list_head conn_proc_list; /* List of conns in this namespace for proc */ 73 struct list_head service_conns; /* Service conns in this namespace */ 74 rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */ 75 struct work_struct service_conn_reaper; 76 struct timer_list service_conn_reap_timer; 77 78 bool live; 79 80 atomic_t nr_client_conns; 81 82 struct hlist_head local_endpoints; 83 struct mutex local_mutex; /* Lock for ->local_endpoints */ 84 85 DECLARE_HASHTABLE (peer_hash, 10); 86 spinlock_t peer_hash_lock; /* Lock for ->peer_hash */ 87 88 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */ 89 u8 peer_keepalive_cursor; 90 time64_t peer_keepalive_base; 91 struct list_head peer_keepalive[32]; 92 struct list_head peer_keepalive_new; 93 struct timer_list peer_keepalive_timer; 94 struct work_struct peer_keepalive_work; 95 96 atomic_t stat_tx_data; 97 atomic_t stat_tx_data_retrans; 98 atomic_t stat_tx_data_send; 99 atomic_t stat_tx_data_send_frag; 100 atomic_t stat_tx_data_send_fail; 101 atomic_t stat_tx_data_underflow; 102 atomic_t stat_tx_data_cwnd_reset; 103 atomic_t stat_rx_data; 104 atomic_t stat_rx_data_reqack; 105 atomic_t stat_rx_data_jumbo; 106 107 atomic_t stat_tx_ack_fill; 108 atomic_t stat_tx_ack_send; 109 atomic_t stat_tx_ack_skip; 110 atomic_t stat_tx_acks[256]; 111 atomic_t stat_rx_acks[256]; 112 113 atomic_t stat_why_req_ack[8]; 114 115 atomic_t stat_io_loop; 116 }; 117 118 /* 119 * Service backlog preallocation. 120 * 121 * This contains circular buffers of preallocated peers, connections and calls 122 * for incoming service calls and their head and tail pointers. This allows 123 * calls to be set up in the data_ready handler, thereby avoiding the need to 124 * shuffle packets around so much. 125 */ 126 struct rxrpc_backlog { 127 unsigned short peer_backlog_head; 128 unsigned short peer_backlog_tail; 129 unsigned short conn_backlog_head; 130 unsigned short conn_backlog_tail; 131 unsigned short call_backlog_head; 132 unsigned short call_backlog_tail; 133 #define RXRPC_BACKLOG_MAX 32 134 struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX]; 135 struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX]; 136 struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX]; 137 }; 138 139 /* 140 * RxRPC socket definition 141 */ 142 struct rxrpc_sock { 143 /* WARNING: sk has to be the first member */ 144 struct sock sk; 145 rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */ 146 rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */ 147 struct rxrpc_local *local; /* local endpoint */ 148 struct rxrpc_backlog *backlog; /* Preallocation for services */ 149 spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */ 150 struct list_head sock_calls; /* List of calls owned by this socket */ 151 struct list_head to_be_accepted; /* calls awaiting acceptance */ 152 struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */ 153 spinlock_t recvmsg_lock; /* Lock for recvmsg_q */ 154 struct key *key; /* security for this socket */ 155 struct key *securities; /* list of server security descriptors */ 156 struct rb_root calls; /* User ID -> call mapping */ 157 unsigned long flags; 158 #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */ 159 rwlock_t call_lock; /* lock for calls */ 160 u32 min_sec_level; /* minimum security level */ 161 #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT 162 bool exclusive; /* Exclusive connection for a client socket */ 163 u16 second_service; /* Additional service bound to the endpoint */ 164 struct { 165 /* Service upgrade information */ 166 u16 from; /* Service ID to upgrade (if not 0) */ 167 u16 to; /* service ID to upgrade to */ 168 } service_upgrade; 169 sa_family_t family; /* Protocol family created with */ 170 struct sockaddr_rxrpc srx; /* Primary Service/local addresses */ 171 struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */ 172 }; 173 174 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk) 175 176 /* 177 * CPU-byteorder normalised Rx packet header. 178 */ 179 struct rxrpc_host_header { 180 u32 epoch; /* client boot timestamp */ 181 u32 cid; /* connection and channel ID */ 182 u32 callNumber; /* call ID (0 for connection-level packets) */ 183 u32 seq; /* sequence number of pkt in call stream */ 184 u32 serial; /* serial number of pkt sent to network */ 185 u8 type; /* packet type */ 186 u8 flags; /* packet flags */ 187 u8 userStatus; /* app-layer defined status */ 188 u8 securityIndex; /* security protocol ID */ 189 union { 190 u16 _rsvd; /* reserved */ 191 u16 cksum; /* kerberos security checksum */ 192 }; 193 u16 serviceId; /* service ID */ 194 } __packed; 195 196 /* 197 * RxRPC socket buffer private variables 198 * - max 48 bytes (struct sk_buff::cb) 199 */ 200 struct rxrpc_skb_priv { 201 union { 202 struct rxrpc_connection *conn; /* Connection referred to (poke packet) */ 203 struct { 204 u16 offset; /* Offset of data */ 205 u16 len; /* Length of data */ 206 u8 flags; 207 #define RXRPC_RX_VERIFIED 0x01 208 }; 209 struct { 210 rxrpc_seq_t first_ack; /* First packet in acks table */ 211 rxrpc_seq_t prev_ack; /* Highest seq seen */ 212 rxrpc_serial_t acked_serial; /* Packet in response to (or 0) */ 213 u8 reason; /* Reason for ack */ 214 u8 nr_acks; /* Number of acks+nacks */ 215 u8 nr_nacks; /* Number of nacks */ 216 } ack; 217 }; 218 struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */ 219 }; 220 221 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb) 222 223 /* 224 * RxRPC security module interface 225 */ 226 struct rxrpc_security { 227 const char *name; /* name of this service */ 228 u8 security_index; /* security type provided */ 229 u32 no_key_abort; /* Abort code indicating no key */ 230 231 /* Initialise a security service */ 232 int (*init)(void); 233 234 /* Clean up a security service */ 235 void (*exit)(void); 236 237 /* Parse the information from a server key */ 238 int (*preparse_server_key)(struct key_preparsed_payload *); 239 240 /* Clean up the preparse buffer after parsing a server key */ 241 void (*free_preparse_server_key)(struct key_preparsed_payload *); 242 243 /* Destroy the payload of a server key */ 244 void (*destroy_server_key)(struct key *); 245 246 /* Describe a server key */ 247 void (*describe_server_key)(const struct key *, struct seq_file *); 248 249 /* initialise a connection's security */ 250 int (*init_connection_security)(struct rxrpc_connection *, 251 struct rxrpc_key_token *); 252 253 /* Work out how much data we can store in a packet, given an estimate 254 * of the amount of data remaining and allocate a data buffer. 255 */ 256 struct rxrpc_txbuf *(*alloc_txbuf)(struct rxrpc_call *call, size_t remaining, gfp_t gfp); 257 258 /* impose security on a packet */ 259 int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *); 260 261 /* verify the security on a received packet */ 262 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *); 263 264 /* Free crypto request on a call */ 265 void (*free_call_crypto)(struct rxrpc_call *); 266 267 /* issue a challenge */ 268 int (*issue_challenge)(struct rxrpc_connection *); 269 270 /* respond to a challenge */ 271 int (*respond_to_challenge)(struct rxrpc_connection *, 272 struct sk_buff *); 273 274 /* verify a response */ 275 int (*verify_response)(struct rxrpc_connection *, 276 struct sk_buff *); 277 278 /* clear connection security */ 279 void (*clear)(struct rxrpc_connection *); 280 }; 281 282 /* 283 * RxRPC local transport endpoint description 284 * - owned by a single AF_RXRPC socket 285 * - pointed to by transport socket struct sk_user_data 286 */ 287 struct rxrpc_local { 288 struct rcu_head rcu; 289 atomic_t active_users; /* Number of users of the local endpoint */ 290 refcount_t ref; /* Number of references to the structure */ 291 struct net *net; /* The network namespace */ 292 struct rxrpc_net *rxnet; /* Our bits in the network namespace */ 293 struct hlist_node link; 294 struct socket *socket; /* my UDP socket */ 295 struct task_struct *io_thread; 296 struct completion io_thread_ready; /* Indication that the I/O thread started */ 297 struct page_frag_cache tx_alloc; /* Tx control packet allocation (I/O thread only) */ 298 struct rxrpc_sock *service; /* Service(s) listening on this endpoint */ 299 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY 300 struct sk_buff_head rx_delay_queue; /* Delay injection queue */ 301 #endif 302 struct sk_buff_head rx_queue; /* Received packets */ 303 struct list_head conn_attend_q; /* Conns requiring immediate attention */ 304 struct list_head call_attend_q; /* Calls requiring immediate attention */ 305 306 struct rb_root client_bundles; /* Client connection bundles by socket params */ 307 spinlock_t client_bundles_lock; /* Lock for client_bundles */ 308 bool kill_all_client_conns; 309 struct list_head idle_client_conns; 310 struct timer_list client_conn_reap_timer; 311 unsigned long client_conn_flags; 312 #define RXRPC_CLIENT_CONN_REAP_TIMER 0 /* The client conn reap timer expired */ 313 314 spinlock_t lock; /* access lock */ 315 rwlock_t services_lock; /* lock for services list */ 316 int debug_id; /* debug ID for printks */ 317 bool dead; 318 bool service_closed; /* Service socket closed */ 319 struct idr conn_ids; /* List of connection IDs */ 320 struct list_head new_client_calls; /* Newly created client calls need connection */ 321 spinlock_t client_call_lock; /* Lock for ->new_client_calls */ 322 struct sockaddr_rxrpc srx; /* local address */ 323 }; 324 325 /* 326 * RxRPC remote transport endpoint definition 327 * - matched by local endpoint, remote port, address and protocol type 328 */ 329 struct rxrpc_peer { 330 struct rcu_head rcu; /* This must be first */ 331 refcount_t ref; 332 unsigned long hash_key; 333 struct hlist_node hash_link; 334 struct rxrpc_local *local; 335 struct hlist_head error_targets; /* targets for net error distribution */ 336 struct rb_root service_conns; /* Service connections */ 337 struct list_head keepalive_link; /* Link in net->peer_keepalive[] */ 338 time64_t last_tx_at; /* Last time packet sent here */ 339 seqlock_t service_conn_lock; 340 spinlock_t lock; /* access lock */ 341 unsigned int if_mtu; /* interface MTU for this peer */ 342 unsigned int mtu; /* network MTU for this peer */ 343 unsigned int maxdata; /* data size (MTU - hdrsize) */ 344 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */ 345 int debug_id; /* debug ID for printks */ 346 struct sockaddr_rxrpc srx; /* remote address */ 347 348 /* calculated RTT cache */ 349 #define RXRPC_RTT_CACHE_SIZE 32 350 spinlock_t rtt_input_lock; /* RTT lock for input routine */ 351 ktime_t rtt_last_req; /* Time of last RTT request */ 352 unsigned int rtt_count; /* Number of samples we've got */ 353 354 u32 srtt_us; /* smoothed round trip time << 3 in usecs */ 355 u32 mdev_us; /* medium deviation */ 356 u32 mdev_max_us; /* maximal mdev for the last rtt period */ 357 u32 rttvar_us; /* smoothed mdev_max */ 358 u32 rto_us; /* Retransmission timeout in usec */ 359 u8 backoff; /* Backoff timeout (as shift) */ 360 361 u8 cong_ssthresh; /* Congestion slow-start threshold */ 362 }; 363 364 /* 365 * Keys for matching a connection. 366 */ 367 struct rxrpc_conn_proto { 368 union { 369 struct { 370 u32 epoch; /* epoch of this connection */ 371 u32 cid; /* connection ID */ 372 }; 373 u64 index_key; 374 }; 375 }; 376 377 struct rxrpc_conn_parameters { 378 struct rxrpc_local *local; /* Representation of local endpoint */ 379 struct rxrpc_peer *peer; /* Representation of remote endpoint */ 380 struct key *key; /* Security details */ 381 bool exclusive; /* T if conn is exclusive */ 382 bool upgrade; /* T if service ID can be upgraded */ 383 u16 service_id; /* Service ID for this connection */ 384 u32 security_level; /* Security level selected */ 385 }; 386 387 /* 388 * Call completion condition (state == RXRPC_CALL_COMPLETE). 389 */ 390 enum rxrpc_call_completion { 391 RXRPC_CALL_SUCCEEDED, /* - Normal termination */ 392 RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */ 393 RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */ 394 RXRPC_CALL_LOCAL_ERROR, /* - call failed due to local error */ 395 RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */ 396 NR__RXRPC_CALL_COMPLETIONS 397 }; 398 399 /* 400 * Bits in the connection flags. 401 */ 402 enum rxrpc_conn_flag { 403 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */ 404 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */ 405 RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */ 406 RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */ 407 RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */ 408 RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */ 409 RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */ 410 }; 411 412 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \ 413 (1UL << RXRPC_CONN_FINAL_ACK_1) | \ 414 (1UL << RXRPC_CONN_FINAL_ACK_2) | \ 415 (1UL << RXRPC_CONN_FINAL_ACK_3)) 416 417 /* 418 * Events that can be raised upon a connection. 419 */ 420 enum rxrpc_conn_event { 421 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */ 422 RXRPC_CONN_EV_ABORT_CALLS, /* Abort attached calls */ 423 }; 424 425 /* 426 * The connection protocol state. 427 */ 428 enum rxrpc_conn_proto_state { 429 RXRPC_CONN_UNUSED, /* Connection not yet attempted */ 430 RXRPC_CONN_CLIENT_UNSECURED, /* Client connection needs security init */ 431 RXRPC_CONN_CLIENT, /* Client connection */ 432 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */ 433 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */ 434 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */ 435 RXRPC_CONN_SERVICE, /* Service secured connection */ 436 RXRPC_CONN_ABORTED, /* Conn aborted */ 437 RXRPC_CONN__NR_STATES 438 }; 439 440 /* 441 * RxRPC client connection bundle. 442 */ 443 struct rxrpc_bundle { 444 struct rxrpc_local *local; /* Representation of local endpoint */ 445 struct rxrpc_peer *peer; /* Remote endpoint */ 446 struct key *key; /* Security details */ 447 struct list_head proc_link; /* Link in net->bundle_proc_list */ 448 const struct rxrpc_security *security; /* applied security module */ 449 refcount_t ref; 450 atomic_t active; /* Number of active users */ 451 unsigned int debug_id; 452 u32 security_level; /* Security level selected */ 453 u16 service_id; /* Service ID for this connection */ 454 bool try_upgrade; /* True if the bundle is attempting upgrade */ 455 bool exclusive; /* T if conn is exclusive */ 456 bool upgrade; /* T if service ID can be upgraded */ 457 unsigned short alloc_error; /* Error from last conn allocation */ 458 struct rb_node local_node; /* Node in local->client_conns */ 459 struct list_head waiting_calls; /* Calls waiting for channels */ 460 unsigned long avail_chans; /* Mask of available channels */ 461 unsigned int conn_ids[4]; /* Connection IDs. */ 462 struct rxrpc_connection *conns[4]; /* The connections in the bundle (max 4) */ 463 }; 464 465 /* 466 * RxRPC connection definition 467 * - matched by { local, peer, epoch, conn_id, direction } 468 * - each connection can only handle four simultaneous calls 469 */ 470 struct rxrpc_connection { 471 struct rxrpc_conn_proto proto; 472 struct rxrpc_local *local; /* Representation of local endpoint */ 473 struct rxrpc_peer *peer; /* Remote endpoint */ 474 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ 475 struct key *key; /* Security details */ 476 struct list_head attend_link; /* Link in local->conn_attend_q */ 477 478 refcount_t ref; 479 atomic_t active; /* Active count for service conns */ 480 struct rcu_head rcu; 481 struct list_head cache_link; 482 483 unsigned char act_chans; /* Mask of active channels */ 484 struct rxrpc_channel { 485 unsigned long final_ack_at; /* Time at which to issue final ACK */ 486 struct rxrpc_call *call; /* Active call */ 487 unsigned int call_debug_id; /* call->debug_id */ 488 u32 call_id; /* ID of current call */ 489 u32 call_counter; /* Call ID counter */ 490 u32 last_call; /* ID of last call */ 491 u8 last_type; /* Type of last packet */ 492 union { 493 u32 last_seq; 494 u32 last_abort; 495 }; 496 } channels[RXRPC_MAXCALLS]; 497 498 struct timer_list timer; /* Conn event timer */ 499 struct work_struct processor; /* connection event processor */ 500 struct work_struct destructor; /* In-process-context destroyer */ 501 struct rxrpc_bundle *bundle; /* Client connection bundle */ 502 struct rb_node service_node; /* Node in peer->service_conns */ 503 struct list_head proc_link; /* link in procfs list */ 504 struct list_head link; /* link in master connection list */ 505 struct sk_buff_head rx_queue; /* received conn-level packets */ 506 struct page_frag_cache tx_data_alloc; /* Tx DATA packet allocation */ 507 struct mutex tx_data_alloc_lock; 508 509 struct mutex security_lock; /* Lock for security management */ 510 const struct rxrpc_security *security; /* applied security module */ 511 union { 512 struct { 513 struct crypto_sync_skcipher *cipher; /* encryption handle */ 514 struct rxrpc_crypt csum_iv; /* packet checksum base */ 515 u32 nonce; /* response re-use preventer */ 516 } rxkad; 517 }; 518 unsigned long flags; 519 unsigned long events; 520 unsigned long idle_timestamp; /* Time at which last became idle */ 521 spinlock_t state_lock; /* state-change lock */ 522 enum rxrpc_conn_proto_state state; /* current state of connection */ 523 enum rxrpc_call_completion completion; /* Completion condition */ 524 s32 abort_code; /* Abort code of connection abort */ 525 int debug_id; /* debug ID for printks */ 526 rxrpc_serial_t tx_serial; /* Outgoing packet serial number counter */ 527 unsigned int hi_serial; /* highest serial number received */ 528 u32 service_id; /* Service ID, possibly upgraded */ 529 u32 security_level; /* Security level selected */ 530 u8 security_ix; /* security type */ 531 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */ 532 u8 bundle_shift; /* Index into bundle->avail_chans */ 533 bool exclusive; /* T if conn is exclusive */ 534 bool upgrade; /* T if service ID can be upgraded */ 535 u16 orig_service_id; /* Originally requested service ID */ 536 short error; /* Local error code */ 537 }; 538 rxrpc_to_server(const struct rxrpc_skb_priv * sp)539 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp) 540 { 541 return sp->hdr.flags & RXRPC_CLIENT_INITIATED; 542 } 543 rxrpc_to_client(const struct rxrpc_skb_priv * sp)544 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp) 545 { 546 return !rxrpc_to_server(sp); 547 } 548 549 /* 550 * Flags in call->flags. 551 */ 552 enum rxrpc_call_flag { 553 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */ 554 RXRPC_CALL_HAS_USERID, /* has a user ID attached */ 555 RXRPC_CALL_IS_SERVICE, /* Call is service call */ 556 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */ 557 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */ 558 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */ 559 RXRPC_CALL_TX_ALL_ACKED, /* Last packet has been hard-acked */ 560 RXRPC_CALL_SEND_PING, /* A ping will need to be sent */ 561 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */ 562 RXRPC_CALL_BEGAN_RX_TIMER, /* We began the expect_rx_by timer */ 563 RXRPC_CALL_RX_HEARD, /* The peer responded at least once to this call */ 564 RXRPC_CALL_DISCONNECTED, /* The call has been disconnected */ 565 RXRPC_CALL_KERNEL, /* The call was made by the kernel */ 566 RXRPC_CALL_UPGRADE, /* Service upgrade was requested for the call */ 567 RXRPC_CALL_EXCLUSIVE, /* The call uses a once-only connection */ 568 RXRPC_CALL_RX_IS_IDLE, /* recvmsg() is idle - send an ACK */ 569 RXRPC_CALL_RECVMSG_READ_ALL, /* recvmsg() read all of the received data */ 570 }; 571 572 /* 573 * Events that can be raised on a call. 574 */ 575 enum rxrpc_call_event { 576 RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */ 577 RXRPC_CALL_EV_INITIAL_PING, /* Send initial ping for a new service call */ 578 }; 579 580 /* 581 * The states that a call can be in. 582 */ 583 enum rxrpc_call_state { 584 RXRPC_CALL_UNINITIALISED, 585 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */ 586 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */ 587 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */ 588 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */ 589 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */ 590 RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */ 591 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */ 592 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */ 593 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */ 594 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */ 595 RXRPC_CALL_COMPLETE, /* - call complete */ 596 NR__RXRPC_CALL_STATES 597 }; 598 599 /* 600 * Call Tx congestion management modes. 601 */ 602 enum rxrpc_congest_mode { 603 RXRPC_CALL_SLOW_START, 604 RXRPC_CALL_CONGEST_AVOIDANCE, 605 RXRPC_CALL_PACKET_LOSS, 606 RXRPC_CALL_FAST_RETRANSMIT, 607 NR__RXRPC_CONGEST_MODES 608 }; 609 610 /* 611 * RxRPC call definition 612 * - matched by { connection, call_id } 613 */ 614 struct rxrpc_call { 615 struct rcu_head rcu; 616 struct rxrpc_connection *conn; /* connection carrying call */ 617 struct rxrpc_bundle *bundle; /* Connection bundle to use */ 618 struct rxrpc_peer *peer; /* Peer record for remote address */ 619 struct rxrpc_local *local; /* Representation of local endpoint */ 620 struct rxrpc_sock __rcu *socket; /* socket responsible */ 621 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ 622 struct key *key; /* Security details */ 623 const struct rxrpc_security *security; /* applied security module */ 624 struct mutex user_mutex; /* User access mutex */ 625 struct sockaddr_rxrpc dest_srx; /* Destination address */ 626 ktime_t delay_ack_at; /* When DELAY ACK needs to happen */ 627 ktime_t ack_lost_at; /* When ACK is figured as lost */ 628 ktime_t resend_at; /* When next resend needs to happen */ 629 ktime_t ping_at; /* When next to send a ping */ 630 ktime_t keepalive_at; /* When next to send a keepalive ping */ 631 ktime_t expect_rx_by; /* When we expect to get a packet by */ 632 ktime_t expect_req_by; /* When we expect to get a request DATA packet by */ 633 ktime_t expect_term_by; /* When we expect call termination by */ 634 u32 next_rx_timo; /* Timeout for next Rx packet (ms) */ 635 u32 next_req_timo; /* Timeout for next Rx request packet (ms) */ 636 u32 hard_timo; /* Maximum lifetime or 0 (s) */ 637 struct timer_list timer; /* Combined event timer */ 638 struct work_struct destroyer; /* In-process-context destroyer */ 639 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */ 640 struct list_head link; /* link in master call list */ 641 struct list_head wait_link; /* Link in local->new_client_calls */ 642 struct hlist_node error_link; /* link in error distribution list */ 643 struct list_head accept_link; /* Link in rx->acceptq */ 644 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */ 645 struct list_head sock_link; /* Link in rx->sock_calls */ 646 struct rb_node sock_node; /* Node in rx->calls */ 647 struct list_head attend_link; /* Link in local->call_attend_q */ 648 struct rxrpc_txbuf *tx_pending; /* Tx buffer being filled */ 649 wait_queue_head_t waitq; /* Wait queue for channel or Tx */ 650 s64 tx_total_len; /* Total length left to be transmitted (or -1) */ 651 unsigned long user_call_ID; /* user-defined call ID */ 652 unsigned long flags; 653 unsigned long events; 654 spinlock_t notify_lock; /* Kernel notification lock */ 655 unsigned int send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */ 656 s32 send_abort; /* Abort code to be sent */ 657 short send_abort_err; /* Error to be associated with the abort */ 658 rxrpc_seq_t send_abort_seq; /* DATA packet that incurred the abort (or 0) */ 659 s32 abort_code; /* Local/remote abort code */ 660 int error; /* Local error incurred */ 661 enum rxrpc_call_state _state; /* Current state of call (needs barrier) */ 662 enum rxrpc_call_completion completion; /* Call completion condition */ 663 refcount_t ref; 664 u8 security_ix; /* Security type */ 665 enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */ 666 u32 call_id; /* call ID on connection */ 667 u32 cid; /* connection ID plus channel index */ 668 u32 security_level; /* Security level selected */ 669 int debug_id; /* debug ID for printks */ 670 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */ 671 unsigned short rx_pkt_len; /* Current recvmsg packet len */ 672 673 /* Transmitted data tracking. */ 674 spinlock_t tx_lock; /* Transmit queue lock */ 675 struct list_head tx_sendmsg; /* Sendmsg prepared packets */ 676 struct list_head tx_buffer; /* Buffer of transmissible packets */ 677 rxrpc_seq_t tx_bottom; /* First packet in buffer */ 678 rxrpc_seq_t tx_transmitted; /* Highest packet transmitted */ 679 rxrpc_seq_t tx_prepared; /* Highest Tx slot prepared. */ 680 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */ 681 u16 tx_backoff; /* Delay to insert due to Tx failure (ms) */ 682 u8 tx_winsize; /* Maximum size of Tx window */ 683 #define RXRPC_TX_MAX_WINDOW 128 684 ktime_t tx_last_sent; /* Last time a transmission occurred */ 685 686 /* Received data tracking */ 687 struct sk_buff_head recvmsg_queue; /* Queue of packets ready for recvmsg() */ 688 struct sk_buff_head rx_oos_queue; /* Queue of out of sequence packets */ 689 690 rxrpc_seq_t rx_highest_seq; /* Higest sequence number received */ 691 rxrpc_seq_t rx_consumed; /* Highest packet consumed */ 692 rxrpc_serial_t rx_serial; /* Highest serial received for this call */ 693 u8 rx_winsize; /* Size of Rx window */ 694 695 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS 696 * is fixed, we keep these numbers in terms of segments (ie. DATA 697 * packets) rather than bytes. 698 */ 699 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN 700 #define RXRPC_MIN_CWND 4 701 u8 cong_cwnd; /* Congestion window size */ 702 u8 cong_extra; /* Extra to send for congestion management */ 703 u8 cong_ssthresh; /* Slow-start threshold */ 704 enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */ 705 u8 cong_dup_acks; /* Count of ACKs showing missing packets */ 706 u8 cong_cumul_acks; /* Cumulative ACK count */ 707 ktime_t cong_tstamp; /* Last time cwnd was changed */ 708 struct sk_buff *cong_last_nack; /* Last ACK with nacks received */ 709 710 /* Receive-phase ACK management (ACKs we send). */ 711 u8 ackr_reason; /* reason to ACK */ 712 u16 ackr_sack_base; /* Starting slot in SACK table ring */ 713 rxrpc_seq_t ackr_window; /* Base of SACK window */ 714 rxrpc_seq_t ackr_wtop; /* Base of SACK window */ 715 unsigned int ackr_nr_unacked; /* Number of unacked packets */ 716 atomic_t ackr_nr_consumed; /* Number of packets needing hard ACK */ 717 struct { 718 #define RXRPC_SACK_SIZE 256 719 /* SACK table for soft-acked packets */ 720 u8 ackr_sack_table[RXRPC_SACK_SIZE]; 721 } __aligned(8); 722 723 /* RTT management */ 724 rxrpc_serial_t rtt_serial[4]; /* Serial number of DATA or PING sent */ 725 ktime_t rtt_sent_at[4]; /* Time packet sent */ 726 unsigned long rtt_avail; /* Mask of available slots in bits 0-3, 727 * Mask of pending samples in 8-11 */ 728 #define RXRPC_CALL_RTT_AVAIL_MASK 0xf 729 #define RXRPC_CALL_RTT_PEND_SHIFT 8 730 731 /* Transmission-phase ACK management (ACKs we've received). */ 732 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */ 733 rxrpc_seq_t acks_first_seq; /* first sequence number received */ 734 rxrpc_seq_t acks_prev_seq; /* Highest previousPacket received */ 735 rxrpc_seq_t acks_hard_ack; /* Latest hard-ack point */ 736 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */ 737 rxrpc_serial_t acks_highest_serial; /* Highest serial number ACK'd */ 738 }; 739 740 /* 741 * Summary of a new ACK and the changes it made to the Tx buffer packet states. 742 */ 743 struct rxrpc_ack_summary { 744 u16 nr_acks; /* Number of ACKs in packet */ 745 u16 nr_new_acks; /* Number of new ACKs in packet */ 746 u16 nr_new_nacks; /* Number of new nacks in packet */ 747 u16 nr_retained_nacks; /* Number of nacks retained between ACKs */ 748 u8 ack_reason; 749 bool saw_nacks; /* Saw NACKs in packet */ 750 bool new_low_nack; /* T if new low NACK found */ 751 bool retrans_timeo; /* T if reTx due to timeout happened */ 752 u8 flight_size; /* Number of unreceived transmissions */ 753 /* Place to stash values for tracing */ 754 enum rxrpc_congest_mode mode:8; 755 u8 cwnd; 756 u8 ssthresh; 757 u8 dup_acks; 758 u8 cumulative_acks; 759 }; 760 761 /* 762 * sendmsg() cmsg-specified parameters. 763 */ 764 enum rxrpc_command { 765 RXRPC_CMD_SEND_DATA, /* send data message */ 766 RXRPC_CMD_SEND_ABORT, /* request abort generation */ 767 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */ 768 RXRPC_CMD_CHARGE_ACCEPT, /* [server] charge accept preallocation */ 769 }; 770 771 struct rxrpc_call_params { 772 s64 tx_total_len; /* Total Tx data length (if send data) */ 773 unsigned long user_call_ID; /* User's call ID */ 774 struct { 775 u32 hard; /* Maximum lifetime (sec) */ 776 u32 idle; /* Max time since last data packet (msec) */ 777 u32 normal; /* Max time since last call packet (msec) */ 778 } timeouts; 779 u8 nr_timeouts; /* Number of timeouts specified */ 780 bool kernel; /* T if kernel is making the call */ 781 enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */ 782 }; 783 784 struct rxrpc_send_params { 785 struct rxrpc_call_params call; 786 u32 abort_code; /* Abort code to Tx (if abort) */ 787 enum rxrpc_command command : 8; /* The command to implement */ 788 bool exclusive; /* Shared or exclusive call */ 789 bool upgrade; /* If the connection is upgradeable */ 790 }; 791 792 /* 793 * Buffer of data to be output as a packet. 794 */ 795 struct rxrpc_txbuf { 796 struct list_head call_link; /* Link in call->tx_sendmsg/tx_buffer */ 797 struct list_head tx_link; /* Link in live Enc queue or Tx queue */ 798 ktime_t last_sent; /* Time at which last transmitted */ 799 refcount_t ref; 800 rxrpc_seq_t seq; /* Sequence number of this packet */ 801 rxrpc_serial_t serial; /* Last serial number transmitted with */ 802 unsigned int call_debug_id; 803 unsigned int debug_id; 804 unsigned int len; /* Amount of data in buffer */ 805 unsigned int space; /* Remaining data space */ 806 unsigned int offset; /* Offset of fill point */ 807 unsigned int flags; 808 #define RXRPC_TXBUF_WIRE_FLAGS 0xff /* The wire protocol flags */ 809 #define RXRPC_TXBUF_RESENT 0x100 /* Set if has been resent */ 810 __be16 cksum; /* Checksum to go in header */ 811 unsigned short ack_rwind; /* ACK receive window */ 812 u8 /*enum rxrpc_propose_ack_trace*/ ack_why; /* If ack, why */ 813 u8 nr_kvec; /* Amount of kvec[] used */ 814 struct kvec kvec[3]; 815 }; 816 rxrpc_sending_to_server(const struct rxrpc_txbuf * txb)817 static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb) 818 { 819 return txb->flags & RXRPC_CLIENT_INITIATED; 820 } 821 rxrpc_sending_to_client(const struct rxrpc_txbuf * txb)822 static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb) 823 { 824 return !rxrpc_sending_to_server(txb); 825 } 826 827 #include <trace/events/rxrpc.h> 828 829 /* 830 * Allocate the next serial number on a connection. 0 must be skipped. 831 */ rxrpc_get_next_serial(struct rxrpc_connection * conn)832 static inline rxrpc_serial_t rxrpc_get_next_serial(struct rxrpc_connection *conn) 833 { 834 rxrpc_serial_t serial; 835 836 serial = conn->tx_serial; 837 if (serial == 0) 838 serial = 1; 839 conn->tx_serial = serial + 1; 840 return serial; 841 } 842 843 /* 844 * af_rxrpc.c 845 */ 846 extern atomic_t rxrpc_n_rx_skbs; 847 extern struct workqueue_struct *rxrpc_workqueue; 848 849 /* 850 * call_accept.c 851 */ 852 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t); 853 void rxrpc_discard_prealloc(struct rxrpc_sock *); 854 bool rxrpc_new_incoming_call(struct rxrpc_local *local, 855 struct rxrpc_peer *peer, 856 struct rxrpc_connection *conn, 857 struct sockaddr_rxrpc *peer_srx, 858 struct sk_buff *skb); 859 int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long); 860 861 /* 862 * call_event.c 863 */ 864 void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial, 865 enum rxrpc_propose_ack_trace why); 866 void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t, 867 enum rxrpc_propose_ack_trace); 868 void rxrpc_shrink_call_tx_buffer(struct rxrpc_call *); 869 void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb); 870 871 bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb); 872 873 /* 874 * call_object.c 875 */ 876 extern const char *const rxrpc_call_states[]; 877 extern const char *const rxrpc_call_completions[]; 878 extern struct kmem_cache *rxrpc_call_jar; 879 880 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what); 881 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long); 882 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int); 883 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *, 884 struct rxrpc_conn_parameters *, 885 struct rxrpc_call_params *, gfp_t, 886 unsigned int); 887 void rxrpc_start_call_timer(struct rxrpc_call *call); 888 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *, 889 struct sk_buff *); 890 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *); 891 void rxrpc_release_calls_on_socket(struct rxrpc_sock *); 892 void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace); 893 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 894 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace); 895 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace); 896 void rxrpc_cleanup_call(struct rxrpc_call *); 897 void rxrpc_destroy_all_calls(struct rxrpc_net *); 898 rxrpc_is_service_call(const struct rxrpc_call * call)899 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call) 900 { 901 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags); 902 } 903 rxrpc_is_client_call(const struct rxrpc_call * call)904 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call) 905 { 906 return !rxrpc_is_service_call(call); 907 } 908 909 /* 910 * call_state.c 911 */ 912 bool rxrpc_set_call_completion(struct rxrpc_call *call, 913 enum rxrpc_call_completion compl, 914 u32 abort_code, 915 int error); 916 bool rxrpc_call_completed(struct rxrpc_call *call); 917 bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq, 918 u32 abort_code, int error, enum rxrpc_abort_reason why); 919 void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl, 920 int error); 921 rxrpc_set_call_state(struct rxrpc_call * call,enum rxrpc_call_state state)922 static inline void rxrpc_set_call_state(struct rxrpc_call *call, 923 enum rxrpc_call_state state) 924 { 925 /* Order write of completion info before write of ->state. */ 926 smp_store_release(&call->_state, state); 927 wake_up(&call->waitq); 928 } 929 __rxrpc_call_state(const struct rxrpc_call * call)930 static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call) 931 { 932 return call->_state; /* Only inside I/O thread */ 933 } 934 __rxrpc_call_is_complete(const struct rxrpc_call * call)935 static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call) 936 { 937 return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; 938 } 939 rxrpc_call_state(const struct rxrpc_call * call)940 static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call) 941 { 942 /* Order read ->state before read of completion info. */ 943 return smp_load_acquire(&call->_state); 944 } 945 rxrpc_call_is_complete(const struct rxrpc_call * call)946 static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call) 947 { 948 return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; 949 } 950 rxrpc_call_has_failed(const struct rxrpc_call * call)951 static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call) 952 { 953 return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED; 954 } 955 956 /* 957 * conn_client.c 958 */ 959 extern unsigned int rxrpc_reap_client_connections; 960 extern unsigned long rxrpc_conn_idle_client_expiry; 961 extern unsigned long rxrpc_conn_idle_client_fast_expiry; 962 963 void rxrpc_purge_client_connections(struct rxrpc_local *local); 964 struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 965 void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); 966 int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp); 967 void rxrpc_connect_client_calls(struct rxrpc_local *local); 968 void rxrpc_expose_client_call(struct rxrpc_call *); 969 void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *); 970 void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle); 971 void rxrpc_discard_expired_client_conns(struct rxrpc_local *local); 972 void rxrpc_clean_up_local_conns(struct rxrpc_local *); 973 974 /* 975 * conn_event.c 976 */ 977 void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb, 978 unsigned int channel); 979 int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb, 980 s32 abort_code, int err, enum rxrpc_abort_reason why); 981 void rxrpc_process_connection(struct work_struct *); 982 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool); 983 bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb); 984 void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb); 985 rxrpc_is_conn_aborted(const struct rxrpc_connection * conn)986 static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn) 987 { 988 /* Order reading the abort info after the state check. */ 989 return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED; 990 } 991 992 /* 993 * conn_object.c 994 */ 995 extern unsigned int rxrpc_connection_expiry; 996 extern unsigned int rxrpc_closed_conn_expiry; 997 998 void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why); 999 struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t); 1000 struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *, 1001 struct sockaddr_rxrpc *, 1002 struct sk_buff *); 1003 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *); 1004 void rxrpc_disconnect_call(struct rxrpc_call *); 1005 void rxrpc_kill_client_conn(struct rxrpc_connection *); 1006 void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace); 1007 void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 1008 struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *, 1009 enum rxrpc_conn_trace); 1010 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *, 1011 enum rxrpc_conn_trace); 1012 void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); 1013 void rxrpc_service_connection_reaper(struct work_struct *); 1014 void rxrpc_destroy_all_connections(struct rxrpc_net *); 1015 rxrpc_conn_is_client(const struct rxrpc_connection * conn)1016 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn) 1017 { 1018 return conn->out_clientflag; 1019 } 1020 rxrpc_conn_is_service(const struct rxrpc_connection * conn)1021 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn) 1022 { 1023 return !rxrpc_conn_is_client(conn); 1024 } 1025 rxrpc_reduce_conn_timer(struct rxrpc_connection * conn,unsigned long expire_at)1026 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn, 1027 unsigned long expire_at) 1028 { 1029 timer_reduce(&conn->timer, expire_at); 1030 } 1031 1032 /* 1033 * conn_service.c 1034 */ 1035 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *, 1036 struct sk_buff *); 1037 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t); 1038 void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *, 1039 const struct rxrpc_security *, struct sk_buff *); 1040 void rxrpc_unpublish_service_conn(struct rxrpc_connection *); 1041 1042 /* 1043 * input.c 1044 */ 1045 void rxrpc_congestion_degrade(struct rxrpc_call *); 1046 void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *); 1047 void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *); 1048 1049 /* 1050 * io_thread.c 1051 */ 1052 int rxrpc_encap_rcv(struct sock *, struct sk_buff *); 1053 void rxrpc_error_report(struct sock *); 1054 bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why, 1055 s32 abort_code, int err); 1056 int rxrpc_io_thread(void *data); rxrpc_wake_up_io_thread(struct rxrpc_local * local)1057 static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local) 1058 { 1059 wake_up_process(READ_ONCE(local->io_thread)); 1060 } 1061 rxrpc_protocol_error(struct sk_buff * skb,enum rxrpc_abort_reason why)1062 static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why) 1063 { 1064 return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO); 1065 } 1066 1067 /* 1068 * insecure.c 1069 */ 1070 extern const struct rxrpc_security rxrpc_no_security; 1071 1072 /* 1073 * key.c 1074 */ 1075 extern struct key_type key_type_rxrpc; 1076 1077 int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int); 1078 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t, 1079 u32); 1080 1081 /* 1082 * local_event.c 1083 */ 1084 void rxrpc_gen_version_string(void); 1085 void rxrpc_send_version_request(struct rxrpc_local *local, 1086 struct rxrpc_host_header *hdr, 1087 struct sk_buff *skb); 1088 1089 /* 1090 * local_object.c 1091 */ 1092 void rxrpc_local_dont_fragment(const struct rxrpc_local *local, bool set); 1093 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *); 1094 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace); 1095 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace); 1096 void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace); 1097 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace); 1098 void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace); 1099 void rxrpc_destroy_local(struct rxrpc_local *local); 1100 void rxrpc_destroy_all_locals(struct rxrpc_net *); 1101 __rxrpc_use_local(struct rxrpc_local * local,enum rxrpc_local_trace why)1102 static inline bool __rxrpc_use_local(struct rxrpc_local *local, 1103 enum rxrpc_local_trace why) 1104 { 1105 int r, u; 1106 1107 r = refcount_read(&local->ref); 1108 u = atomic_fetch_add_unless(&local->active_users, 1, 0); 1109 trace_rxrpc_local(local->debug_id, why, r, u); 1110 return u != 0; 1111 } 1112 rxrpc_see_local(struct rxrpc_local * local,enum rxrpc_local_trace why)1113 static inline void rxrpc_see_local(struct rxrpc_local *local, 1114 enum rxrpc_local_trace why) 1115 { 1116 int r, u; 1117 1118 r = refcount_read(&local->ref); 1119 u = atomic_read(&local->active_users); 1120 trace_rxrpc_local(local->debug_id, why, r, u); 1121 } 1122 1123 /* 1124 * misc.c 1125 */ 1126 extern unsigned int rxrpc_max_backlog __read_mostly; 1127 extern unsigned long rxrpc_soft_ack_delay; 1128 extern unsigned long rxrpc_idle_ack_delay; 1129 extern unsigned int rxrpc_rx_window_size; 1130 extern unsigned int rxrpc_rx_mtu; 1131 extern unsigned int rxrpc_rx_jumbo_max; 1132 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY 1133 extern unsigned long rxrpc_inject_rx_delay; 1134 #endif 1135 1136 /* 1137 * net_ns.c 1138 */ 1139 extern unsigned int rxrpc_net_id; 1140 extern struct pernet_operations rxrpc_net_ops; 1141 rxrpc_net(struct net * net)1142 static inline struct rxrpc_net *rxrpc_net(struct net *net) 1143 { 1144 return net_generic(net, rxrpc_net_id); 1145 } 1146 1147 /* 1148 * output.c 1149 */ 1150 void rxrpc_send_ACK(struct rxrpc_call *call, u8 ack_reason, 1151 rxrpc_serial_t serial, enum rxrpc_propose_ack_trace why); 1152 int rxrpc_send_abort_packet(struct rxrpc_call *); 1153 void rxrpc_send_conn_abort(struct rxrpc_connection *conn); 1154 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb); 1155 void rxrpc_send_keepalive(struct rxrpc_peer *); 1156 void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb); 1157 1158 /* 1159 * peer_event.c 1160 */ 1161 void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *); 1162 void rxrpc_peer_keepalive_worker(struct work_struct *); 1163 1164 /* 1165 * peer_object.c 1166 */ 1167 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *, 1168 const struct sockaddr_rxrpc *); 1169 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local, 1170 struct sockaddr_rxrpc *srx, gfp_t gfp); 1171 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t, 1172 enum rxrpc_peer_trace); 1173 void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer); 1174 void rxrpc_destroy_all_peers(struct rxrpc_net *); 1175 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1176 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace); 1177 void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); 1178 1179 /* 1180 * proc.c 1181 */ 1182 extern const struct seq_operations rxrpc_call_seq_ops; 1183 extern const struct seq_operations rxrpc_connection_seq_ops; 1184 extern const struct seq_operations rxrpc_bundle_seq_ops; 1185 extern const struct seq_operations rxrpc_peer_seq_ops; 1186 extern const struct seq_operations rxrpc_local_seq_ops; 1187 1188 /* 1189 * recvmsg.c 1190 */ 1191 void rxrpc_notify_socket(struct rxrpc_call *); 1192 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int); 1193 1194 /* 1195 * Abort a call due to a protocol error. 1196 */ rxrpc_abort_eproto(struct rxrpc_call * call,struct sk_buff * skb,s32 abort_code,enum rxrpc_abort_reason why)1197 static inline int rxrpc_abort_eproto(struct rxrpc_call *call, 1198 struct sk_buff *skb, 1199 s32 abort_code, 1200 enum rxrpc_abort_reason why) 1201 { 1202 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 1203 1204 rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why); 1205 return -EPROTO; 1206 } 1207 1208 /* 1209 * rtt.c 1210 */ 1211 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, int, 1212 rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t); 1213 ktime_t rxrpc_get_rto_backoff(struct rxrpc_peer *peer, bool retrans); 1214 void rxrpc_peer_init_rtt(struct rxrpc_peer *); 1215 1216 /* 1217 * rxkad.c 1218 */ 1219 #ifdef CONFIG_RXKAD 1220 extern const struct rxrpc_security rxkad; 1221 #endif 1222 1223 /* 1224 * security.c 1225 */ 1226 int __init rxrpc_init_security(void); 1227 const struct rxrpc_security *rxrpc_security_lookup(u8); 1228 void rxrpc_exit_security(void); 1229 int rxrpc_init_client_call_security(struct rxrpc_call *); 1230 int rxrpc_init_client_conn_security(struct rxrpc_connection *); 1231 const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *, 1232 struct sk_buff *); 1233 struct key *rxrpc_look_up_server_security(struct rxrpc_connection *, 1234 struct sk_buff *, u32, u32); 1235 1236 /* 1237 * sendmsg.c 1238 */ 1239 bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error, 1240 enum rxrpc_abort_reason why); 1241 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t); 1242 1243 /* 1244 * server_key.c 1245 */ 1246 extern struct key_type key_type_rxrpc_s; 1247 1248 int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int); 1249 1250 /* 1251 * skbuff.c 1252 */ 1253 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *); 1254 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace); 1255 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace); 1256 void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace); 1257 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace); 1258 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace); 1259 void rxrpc_purge_queue(struct sk_buff_head *); 1260 1261 /* 1262 * stats.c 1263 */ 1264 int rxrpc_stats_show(struct seq_file *seq, void *v); 1265 int rxrpc_stats_clear(struct file *file, char *buf, size_t size); 1266 1267 #define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s) 1268 #define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s) 1269 1270 /* 1271 * sysctl.c 1272 */ 1273 #ifdef CONFIG_SYSCTL 1274 extern int __init rxrpc_sysctl_init(void); 1275 extern void rxrpc_sysctl_exit(void); 1276 #else rxrpc_sysctl_init(void)1277 static inline int __init rxrpc_sysctl_init(void) { return 0; } rxrpc_sysctl_exit(void)1278 static inline void rxrpc_sysctl_exit(void) {} 1279 #endif 1280 1281 /* 1282 * txbuf.c 1283 */ 1284 extern atomic_t rxrpc_nr_txbuf; 1285 struct rxrpc_txbuf *rxrpc_alloc_data_txbuf(struct rxrpc_call *call, size_t data_size, 1286 size_t data_align, gfp_t gfp); 1287 struct rxrpc_txbuf *rxrpc_alloc_ack_txbuf(struct rxrpc_call *call, size_t sack_size); 1288 void rxrpc_get_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1289 void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1290 void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); 1291 1292 /* 1293 * utils.c 1294 */ 1295 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *); 1296 before(u32 seq1,u32 seq2)1297 static inline bool before(u32 seq1, u32 seq2) 1298 { 1299 return (s32)(seq1 - seq2) < 0; 1300 } before_eq(u32 seq1,u32 seq2)1301 static inline bool before_eq(u32 seq1, u32 seq2) 1302 { 1303 return (s32)(seq1 - seq2) <= 0; 1304 } after(u32 seq1,u32 seq2)1305 static inline bool after(u32 seq1, u32 seq2) 1306 { 1307 return (s32)(seq1 - seq2) > 0; 1308 } after_eq(u32 seq1,u32 seq2)1309 static inline bool after_eq(u32 seq1, u32 seq2) 1310 { 1311 return (s32)(seq1 - seq2) >= 0; 1312 } 1313 1314 /* 1315 * debug tracing 1316 */ 1317 extern unsigned int rxrpc_debug; 1318 1319 #define dbgprintk(FMT,...) \ 1320 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) 1321 1322 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1323 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1324 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) 1325 1326 1327 #if defined(__KDEBUG) 1328 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) 1329 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) 1330 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) 1331 1332 #elif defined(CONFIG_AF_RXRPC_DEBUG) 1333 #define RXRPC_DEBUG_KENTER 0x01 1334 #define RXRPC_DEBUG_KLEAVE 0x02 1335 #define RXRPC_DEBUG_KDEBUG 0x04 1336 1337 #define _enter(FMT,...) \ 1338 do { \ 1339 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \ 1340 kenter(FMT,##__VA_ARGS__); \ 1341 } while (0) 1342 1343 #define _leave(FMT,...) \ 1344 do { \ 1345 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \ 1346 kleave(FMT,##__VA_ARGS__); \ 1347 } while (0) 1348 1349 #define _debug(FMT,...) \ 1350 do { \ 1351 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \ 1352 kdebug(FMT,##__VA_ARGS__); \ 1353 } while (0) 1354 1355 #else 1356 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) 1357 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) 1358 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) 1359 #endif 1360 1361 /* 1362 * debug assertion checking 1363 */ 1364 #if 1 // defined(__KDEBUGALL) 1365 1366 #define ASSERT(X) \ 1367 do { \ 1368 if (unlikely(!(X))) { \ 1369 pr_err("Assertion failed\n"); \ 1370 BUG(); \ 1371 } \ 1372 } while (0) 1373 1374 #define ASSERTCMP(X, OP, Y) \ 1375 do { \ 1376 __typeof__(X) _x = (X); \ 1377 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1378 if (unlikely(!(_x OP _y))) { \ 1379 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1380 (unsigned long)_x, (unsigned long)_x, #OP, \ 1381 (unsigned long)_y, (unsigned long)_y); \ 1382 BUG(); \ 1383 } \ 1384 } while (0) 1385 1386 #define ASSERTIF(C, X) \ 1387 do { \ 1388 if (unlikely((C) && !(X))) { \ 1389 pr_err("Assertion failed\n"); \ 1390 BUG(); \ 1391 } \ 1392 } while (0) 1393 1394 #define ASSERTIFCMP(C, X, OP, Y) \ 1395 do { \ 1396 __typeof__(X) _x = (X); \ 1397 __typeof__(Y) _y = (__typeof__(X))(Y); \ 1398 if (unlikely((C) && !(_x OP _y))) { \ 1399 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ 1400 (unsigned long)_x, (unsigned long)_x, #OP, \ 1401 (unsigned long)_y, (unsigned long)_y); \ 1402 BUG(); \ 1403 } \ 1404 } while (0) 1405 1406 #else 1407 1408 #define ASSERT(X) \ 1409 do { \ 1410 } while (0) 1411 1412 #define ASSERTCMP(X, OP, Y) \ 1413 do { \ 1414 } while (0) 1415 1416 #define ASSERTIF(C, X) \ 1417 do { \ 1418 } while (0) 1419 1420 #define ASSERTIFCMP(C, X, OP, Y) \ 1421 do { \ 1422 } while (0) 1423 1424 #endif /* __KDEBUGALL */ 1425