rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* AF_RXRPC internal definitions |
| 2 | * |
| 3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/atomic.h> |
| 13 | #include <linux/seqlock.h> |
| 14 | #include <net/net_namespace.h> |
| 15 | #include <net/netns/generic.h> |
| 16 | #include <net/sock.h> |
| 17 | #include <net/af_rxrpc.h> |
| 18 | #include "protocol.h" |
| 19 | |
| 20 | #if 0 |
| 21 | #define CHECK_SLAB_OKAY(X) \ |
| 22 | BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \ |
| 23 | (POISON_FREE << 8 | POISON_FREE)) |
| 24 | #else |
| 25 | #define CHECK_SLAB_OKAY(X) do {} while (0) |
| 26 | #endif |
| 27 | |
| 28 | #define FCRYPT_BSIZE 8 |
| 29 | struct rxrpc_crypt { |
| 30 | union { |
| 31 | u8 x[FCRYPT_BSIZE]; |
| 32 | __be32 n[2]; |
| 33 | }; |
| 34 | } __attribute__((aligned(8))); |
| 35 | |
| 36 | #define rxrpc_queue_work(WS) queue_work(rxrpc_workqueue, (WS)) |
| 37 | #define rxrpc_queue_delayed_work(WS,D) \ |
| 38 | queue_delayed_work(rxrpc_workqueue, (WS), (D)) |
| 39 | |
| 40 | struct rxrpc_connection; |
| 41 | |
| 42 | /* |
| 43 | * Mark applied to socket buffers. |
| 44 | */ |
| 45 | enum rxrpc_skb_mark { |
| 46 | RXRPC_SKB_MARK_DATA, /* data message */ |
| 47 | RXRPC_SKB_MARK_FINAL_ACK, /* final ACK received message */ |
| 48 | RXRPC_SKB_MARK_BUSY, /* server busy message */ |
| 49 | RXRPC_SKB_MARK_REMOTE_ABORT, /* remote abort message */ |
| 50 | RXRPC_SKB_MARK_LOCAL_ABORT, /* local abort message */ |
| 51 | RXRPC_SKB_MARK_NET_ERROR, /* network error message */ |
| 52 | RXRPC_SKB_MARK_LOCAL_ERROR, /* local error message */ |
| 53 | RXRPC_SKB_MARK_NEW_CALL, /* local error message */ |
| 54 | }; |
| 55 | |
| 56 | /* |
| 57 | * sk_state for RxRPC sockets |
| 58 | */ |
| 59 | enum { |
| 60 | RXRPC_UNBOUND = 0, |
| 61 | RXRPC_CLIENT_UNBOUND, /* Unbound socket used as client */ |
| 62 | RXRPC_CLIENT_BOUND, /* client local address bound */ |
| 63 | RXRPC_SERVER_BOUND, /* server local address bound */ |
| 64 | RXRPC_SERVER_BOUND2, /* second server local address bound */ |
| 65 | RXRPC_SERVER_LISTENING, /* server listening for connections */ |
| 66 | RXRPC_SERVER_LISTEN_DISABLED, /* server listening disabled */ |
| 67 | RXRPC_CLOSE, /* socket is being closed */ |
| 68 | }; |
| 69 | |
| 70 | /* |
| 71 | * Per-network namespace data. |
| 72 | */ |
| 73 | struct rxrpc_net { |
| 74 | struct proc_dir_entry *proc_net; /* Subdir in /proc/net */ |
| 75 | u32 epoch; /* Local epoch for detecting local-end reset */ |
| 76 | struct list_head calls; /* List of calls active in this namespace */ |
| 77 | rwlock_t call_lock; /* Lock for ->calls */ |
| 78 | |
| 79 | struct list_head conn_proc_list; /* List of conns in this namespace for proc */ |
| 80 | struct list_head service_conns; /* Service conns in this namespace */ |
| 81 | rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */ |
| 82 | struct delayed_work service_conn_reaper; |
| 83 | |
| 84 | unsigned int nr_client_conns; |
| 85 | unsigned int nr_active_client_conns; |
| 86 | bool kill_all_client_conns; |
| 87 | bool live; |
| 88 | spinlock_t client_conn_cache_lock; /* Lock for ->*_client_conns */ |
| 89 | spinlock_t client_conn_discard_lock; /* Prevent multiple discarders */ |
| 90 | struct list_head waiting_client_conns; |
| 91 | struct list_head active_client_conns; |
| 92 | struct list_head idle_client_conns; |
| 93 | struct delayed_work client_conn_reaper; |
| 94 | |
| 95 | struct list_head local_endpoints; |
| 96 | struct mutex local_mutex; /* Lock for ->local_endpoints */ |
| 97 | |
| 98 | spinlock_t peer_hash_lock; /* Lock for ->peer_hash */ |
| 99 | DECLARE_HASHTABLE (peer_hash, 10); |
| 100 | }; |
| 101 | |
| 102 | /* |
| 103 | * Service backlog preallocation. |
| 104 | * |
| 105 | * This contains circular buffers of preallocated peers, connections and calls |
| 106 | * for incoming service calls and their head and tail pointers. This allows |
| 107 | * calls to be set up in the data_ready handler, thereby avoiding the need to |
| 108 | * shuffle packets around so much. |
| 109 | */ |
| 110 | struct rxrpc_backlog { |
| 111 | unsigned short peer_backlog_head; |
| 112 | unsigned short peer_backlog_tail; |
| 113 | unsigned short conn_backlog_head; |
| 114 | unsigned short conn_backlog_tail; |
| 115 | unsigned short call_backlog_head; |
| 116 | unsigned short call_backlog_tail; |
| 117 | #define RXRPC_BACKLOG_MAX 32 |
| 118 | struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX]; |
| 119 | struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX]; |
| 120 | struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX]; |
| 121 | }; |
| 122 | |
| 123 | /* |
| 124 | * RxRPC socket definition |
| 125 | */ |
| 126 | struct rxrpc_sock { |
| 127 | /* WARNING: sk has to be the first member */ |
| 128 | struct sock sk; |
| 129 | rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */ |
| 130 | rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */ |
| 131 | struct rxrpc_local *local; /* local endpoint */ |
| 132 | struct rxrpc_backlog *backlog; /* Preallocation for services */ |
| 133 | spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */ |
| 134 | struct list_head sock_calls; /* List of calls owned by this socket */ |
| 135 | struct list_head to_be_accepted; /* calls awaiting acceptance */ |
| 136 | struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */ |
| 137 | rwlock_t recvmsg_lock; /* Lock for recvmsg_q */ |
| 138 | struct key *key; /* security for this socket */ |
| 139 | struct key *securities; /* list of server security descriptors */ |
| 140 | struct rb_root calls; /* User ID -> call mapping */ |
| 141 | unsigned long flags; |
| 142 | #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */ |
| 143 | rwlock_t call_lock; /* lock for calls */ |
| 144 | u32 min_sec_level; /* minimum security level */ |
| 145 | #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT |
| 146 | bool exclusive; /* Exclusive connection for a client socket */ |
| 147 | u16 second_service; /* Additional service bound to the endpoint */ |
| 148 | struct { |
| 149 | /* Service upgrade information */ |
| 150 | u16 from; /* Service ID to upgrade (if not 0) */ |
| 151 | u16 to; /* service ID to upgrade to */ |
| 152 | } service_upgrade; |
| 153 | sa_family_t family; /* Protocol family created with */ |
| 154 | struct sockaddr_rxrpc srx; /* Primary Service/local addresses */ |
| 155 | struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */ |
| 156 | }; |
| 157 | |
| 158 | #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk) |
| 159 | |
| 160 | /* |
| 161 | * CPU-byteorder normalised Rx packet header. |
| 162 | */ |
| 163 | struct rxrpc_host_header { |
| 164 | u32 epoch; /* client boot timestamp */ |
| 165 | u32 cid; /* connection and channel ID */ |
| 166 | u32 callNumber; /* call ID (0 for connection-level packets) */ |
| 167 | u32 seq; /* sequence number of pkt in call stream */ |
| 168 | u32 serial; /* serial number of pkt sent to network */ |
| 169 | u8 type; /* packet type */ |
| 170 | u8 flags; /* packet flags */ |
| 171 | u8 userStatus; /* app-layer defined status */ |
| 172 | u8 securityIndex; /* security protocol ID */ |
| 173 | union { |
| 174 | u16 _rsvd; /* reserved */ |
| 175 | u16 cksum; /* kerberos security checksum */ |
| 176 | }; |
| 177 | u16 serviceId; /* service ID */ |
| 178 | } __packed; |
| 179 | |
| 180 | /* |
| 181 | * RxRPC socket buffer private variables |
| 182 | * - max 48 bytes (struct sk_buff::cb) |
| 183 | */ |
| 184 | struct rxrpc_skb_priv { |
| 185 | union { |
| 186 | u8 nr_jumbo; /* Number of jumbo subpackets */ |
| 187 | }; |
| 188 | union { |
| 189 | int remain; /* amount of space remaining for next write */ |
| 190 | }; |
| 191 | |
| 192 | struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */ |
| 193 | }; |
| 194 | |
| 195 | #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb) |
| 196 | |
| 197 | /* |
| 198 | * RxRPC security module interface |
| 199 | */ |
| 200 | struct rxrpc_security { |
| 201 | const char *name; /* name of this service */ |
| 202 | u8 security_index; /* security type provided */ |
| 203 | |
| 204 | /* Initialise a security service */ |
| 205 | int (*init)(void); |
| 206 | |
| 207 | /* Clean up a security service */ |
| 208 | void (*exit)(void); |
| 209 | |
| 210 | /* initialise a connection's security */ |
| 211 | int (*init_connection_security)(struct rxrpc_connection *); |
| 212 | |
| 213 | /* prime a connection's packet security */ |
| 214 | int (*prime_packet_security)(struct rxrpc_connection *); |
| 215 | |
| 216 | /* impose security on a packet */ |
| 217 | int (*secure_packet)(struct rxrpc_call *, |
| 218 | struct sk_buff *, |
| 219 | size_t, |
| 220 | void *); |
| 221 | |
| 222 | /* verify the security on a received packet */ |
| 223 | int (*verify_packet)(struct rxrpc_call *, struct sk_buff *, |
| 224 | unsigned int, unsigned int, rxrpc_seq_t, u16); |
| 225 | |
| 226 | /* Locate the data in a received packet that has been verified. */ |
| 227 | void (*locate_data)(struct rxrpc_call *, struct sk_buff *, |
| 228 | unsigned int *, unsigned int *); |
| 229 | |
| 230 | /* issue a challenge */ |
| 231 | int (*issue_challenge)(struct rxrpc_connection *); |
| 232 | |
| 233 | /* respond to a challenge */ |
| 234 | int (*respond_to_challenge)(struct rxrpc_connection *, |
| 235 | struct sk_buff *, |
| 236 | u32 *); |
| 237 | |
| 238 | /* verify a response */ |
| 239 | int (*verify_response)(struct rxrpc_connection *, |
| 240 | struct sk_buff *, |
| 241 | u32 *); |
| 242 | |
| 243 | /* clear connection security */ |
| 244 | void (*clear)(struct rxrpc_connection *); |
| 245 | }; |
| 246 | |
| 247 | /* |
| 248 | * RxRPC local transport endpoint description |
| 249 | * - owned by a single AF_RXRPC socket |
| 250 | * - pointed to by transport socket struct sk_user_data |
| 251 | */ |
| 252 | struct rxrpc_local { |
| 253 | struct rcu_head rcu; |
| 254 | atomic_t usage; |
| 255 | struct rxrpc_net *rxnet; /* The network ns in which this resides */ |
| 256 | struct list_head link; |
| 257 | struct socket *socket; /* my UDP socket */ |
| 258 | struct work_struct processor; |
| 259 | struct rxrpc_sock __rcu *service; /* Service(s) listening on this endpoint */ |
| 260 | struct rw_semaphore defrag_sem; /* control re-enablement of IP DF bit */ |
| 261 | struct sk_buff_head reject_queue; /* packets awaiting rejection */ |
| 262 | struct sk_buff_head event_queue; /* endpoint event packets awaiting processing */ |
| 263 | struct rb_root client_conns; /* Client connections by socket params */ |
| 264 | spinlock_t client_conns_lock; /* Lock for client_conns */ |
| 265 | spinlock_t lock; /* access lock */ |
| 266 | rwlock_t services_lock; /* lock for services list */ |
| 267 | int debug_id; /* debug ID for printks */ |
| 268 | bool dead; |
| 269 | bool service_closed; /* Service socket closed */ |
| 270 | struct sockaddr_rxrpc srx; /* local address */ |
| 271 | }; |
| 272 | |
| 273 | /* |
| 274 | * RxRPC remote transport endpoint definition |
| 275 | * - matched by local endpoint, remote port, address and protocol type |
| 276 | */ |
| 277 | struct rxrpc_peer { |
| 278 | struct rcu_head rcu; /* This must be first */ |
| 279 | atomic_t usage; |
| 280 | unsigned long hash_key; |
| 281 | struct hlist_node hash_link; |
| 282 | struct rxrpc_local *local; |
| 283 | struct hlist_head error_targets; /* targets for net error distribution */ |
| 284 | struct work_struct error_distributor; |
| 285 | struct rb_root service_conns; /* Service connections */ |
| 286 | seqlock_t service_conn_lock; |
| 287 | spinlock_t lock; /* access lock */ |
| 288 | unsigned int if_mtu; /* interface MTU for this peer */ |
| 289 | unsigned int mtu; /* network MTU for this peer */ |
| 290 | unsigned int maxdata; /* data size (MTU - hdrsize) */ |
| 291 | unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */ |
| 292 | int debug_id; /* debug ID for printks */ |
| 293 | int error_report; /* Net (+0) or local (+1000000) to distribute */ |
| 294 | #define RXRPC_LOCAL_ERROR_OFFSET 1000000 |
| 295 | struct sockaddr_rxrpc srx; /* remote address */ |
| 296 | |
| 297 | /* calculated RTT cache */ |
| 298 | #define RXRPC_RTT_CACHE_SIZE 32 |
| 299 | ktime_t rtt_last_req; /* Time of last RTT request */ |
| 300 | u64 rtt; /* Current RTT estimate (in nS) */ |
| 301 | u64 rtt_sum; /* Sum of cache contents */ |
| 302 | u64 rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */ |
| 303 | u8 rtt_cursor; /* next entry at which to insert */ |
| 304 | u8 rtt_usage; /* amount of cache actually used */ |
| 305 | |
| 306 | u8 cong_cwnd; /* Congestion window size */ |
| 307 | }; |
| 308 | |
| 309 | /* |
| 310 | * Keys for matching a connection. |
| 311 | */ |
| 312 | struct rxrpc_conn_proto { |
| 313 | union { |
| 314 | struct { |
| 315 | u32 epoch; /* epoch of this connection */ |
| 316 | u32 cid; /* connection ID */ |
| 317 | }; |
| 318 | u64 index_key; |
| 319 | }; |
| 320 | }; |
| 321 | |
| 322 | struct rxrpc_conn_parameters { |
| 323 | struct rxrpc_local *local; /* Representation of local endpoint */ |
| 324 | struct rxrpc_peer *peer; /* Remote endpoint */ |
| 325 | struct key *key; /* Security details */ |
| 326 | bool exclusive; /* T if conn is exclusive */ |
| 327 | bool upgrade; /* T if service ID can be upgraded */ |
| 328 | u16 service_id; /* Service ID for this connection */ |
| 329 | u32 security_level; /* Security level selected */ |
| 330 | }; |
| 331 | |
| 332 | /* |
| 333 | * Bits in the connection flags. |
| 334 | */ |
| 335 | enum rxrpc_conn_flag { |
| 336 | RXRPC_CONN_HAS_IDR, /* Has a client conn ID assigned */ |
| 337 | RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */ |
| 338 | RXRPC_CONN_IN_CLIENT_CONNS, /* Conn is in local->client_conns */ |
| 339 | RXRPC_CONN_EXPOSED, /* Conn has extra ref for exposure */ |
| 340 | RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */ |
| 341 | RXRPC_CONN_COUNTED, /* Counted by rxrpc_nr_client_conns */ |
| 342 | RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */ |
| 343 | }; |
| 344 | |
| 345 | /* |
| 346 | * Events that can be raised upon a connection. |
| 347 | */ |
| 348 | enum rxrpc_conn_event { |
| 349 | RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */ |
| 350 | }; |
| 351 | |
| 352 | /* |
| 353 | * The connection cache state. |
| 354 | */ |
| 355 | enum rxrpc_conn_cache_state { |
| 356 | RXRPC_CONN_CLIENT_INACTIVE, /* Conn is not yet listed */ |
| 357 | RXRPC_CONN_CLIENT_WAITING, /* Conn is on wait list, waiting for capacity */ |
| 358 | RXRPC_CONN_CLIENT_ACTIVE, /* Conn is on active list, doing calls */ |
| 359 | RXRPC_CONN_CLIENT_UPGRADE, /* Conn is on active list, probing for upgrade */ |
| 360 | RXRPC_CONN_CLIENT_CULLED, /* Conn is culled and delisted, doing calls */ |
| 361 | RXRPC_CONN_CLIENT_IDLE, /* Conn is on idle list, doing mostly nothing */ |
| 362 | RXRPC_CONN__NR_CACHE_STATES |
| 363 | }; |
| 364 | |
| 365 | /* |
| 366 | * The connection protocol state. |
| 367 | */ |
| 368 | enum rxrpc_conn_proto_state { |
| 369 | RXRPC_CONN_UNUSED, /* Connection not yet attempted */ |
| 370 | RXRPC_CONN_CLIENT, /* Client connection */ |
| 371 | RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */ |
| 372 | RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */ |
| 373 | RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */ |
| 374 | RXRPC_CONN_SERVICE, /* Service secured connection */ |
| 375 | RXRPC_CONN_REMOTELY_ABORTED, /* Conn aborted by peer */ |
| 376 | RXRPC_CONN_LOCALLY_ABORTED, /* Conn aborted locally */ |
| 377 | RXRPC_CONN__NR_STATES |
| 378 | }; |
| 379 | |
| 380 | /* |
| 381 | * RxRPC connection definition |
| 382 | * - matched by { local, peer, epoch, conn_id, direction } |
| 383 | * - each connection can only handle four simultaneous calls |
| 384 | */ |
| 385 | struct rxrpc_connection { |
| 386 | struct rxrpc_conn_proto proto; |
| 387 | struct rxrpc_conn_parameters params; |
| 388 | |
| 389 | atomic_t usage; |
| 390 | struct rcu_head rcu; |
| 391 | struct list_head cache_link; |
| 392 | |
| 393 | spinlock_t channel_lock; |
| 394 | unsigned char active_chans; /* Mask of active channels */ |
| 395 | #define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1) |
| 396 | struct list_head waiting_calls; /* Calls waiting for channels */ |
| 397 | struct rxrpc_channel { |
| 398 | struct rxrpc_call __rcu *call; /* Active call */ |
| 399 | u32 call_id; /* ID of current call */ |
| 400 | u32 call_counter; /* Call ID counter */ |
| 401 | u32 last_call; /* ID of last call */ |
| 402 | u8 last_type; /* Type of last packet */ |
| 403 | union { |
| 404 | u32 last_seq; |
| 405 | u32 last_abort; |
| 406 | }; |
| 407 | } channels[RXRPC_MAXCALLS]; |
| 408 | |
| 409 | struct work_struct processor; /* connection event processor */ |
| 410 | union { |
| 411 | struct rb_node client_node; /* Node in local->client_conns */ |
| 412 | struct rb_node service_node; /* Node in peer->service_conns */ |
| 413 | }; |
| 414 | struct list_head proc_link; /* link in procfs list */ |
| 415 | struct list_head link; /* link in master connection list */ |
| 416 | struct sk_buff_head rx_queue; /* received conn-level packets */ |
| 417 | const struct rxrpc_security *security; /* applied security module */ |
| 418 | struct key *server_key; /* security for this service */ |
| 419 | struct crypto_skcipher *cipher; /* encryption handle */ |
| 420 | struct rxrpc_crypt csum_iv; /* packet checksum base */ |
| 421 | unsigned long flags; |
| 422 | unsigned long events; |
| 423 | unsigned long idle_timestamp; /* Time at which last became idle */ |
| 424 | spinlock_t state_lock; /* state-change lock */ |
| 425 | enum rxrpc_conn_cache_state cache_state; |
| 426 | enum rxrpc_conn_proto_state state; /* current state of connection */ |
| 427 | u32 abort_code; /* Abort code of connection abort */ |
| 428 | int debug_id; /* debug ID for printks */ |
| 429 | atomic_t serial; /* packet serial number counter */ |
| 430 | unsigned int hi_serial; /* highest serial number received */ |
| 431 | u32 security_nonce; /* response re-use preventer */ |
| 432 | u16 service_id; /* Service ID, possibly upgraded */ |
| 433 | u8 size_align; /* data size alignment (for security) */ |
| 434 | u8 security_size; /* security header size */ |
| 435 | u8 security_ix; /* security type */ |
| 436 | u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */ |
| 437 | short error; /* Local error code */ |
| 438 | }; |
| 439 | |
| 440 | /* |
| 441 | * Flags in call->flags. |
| 442 | */ |
| 443 | enum rxrpc_call_flag { |
| 444 | RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */ |
| 445 | RXRPC_CALL_HAS_USERID, /* has a user ID attached */ |
| 446 | RXRPC_CALL_IS_SERVICE, /* Call is service call */ |
| 447 | RXRPC_CALL_EXPOSED, /* The call was exposed to the world */ |
| 448 | RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */ |
| 449 | RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */ |
| 450 | RXRPC_CALL_TX_LASTQ, /* Last packet has been queued */ |
| 451 | RXRPC_CALL_SEND_PING, /* A ping will need to be sent */ |
| 452 | RXRPC_CALL_PINGING, /* Ping in process */ |
| 453 | RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */ |
| 454 | RXRPC_CALL_DISCONNECTED, /* The call has been disconnected */ |
| 455 | }; |
| 456 | |
| 457 | /* |
| 458 | * Events that can be raised on a call. |
| 459 | */ |
| 460 | enum rxrpc_call_event { |
| 461 | RXRPC_CALL_EV_ACK, /* need to generate ACK */ |
| 462 | RXRPC_CALL_EV_ABORT, /* need to generate abort */ |
| 463 | RXRPC_CALL_EV_TIMER, /* Timer expired */ |
| 464 | RXRPC_CALL_EV_RESEND, /* Tx resend required */ |
| 465 | RXRPC_CALL_EV_PING, /* Ping send required */ |
| 466 | }; |
| 467 | |
| 468 | /* |
| 469 | * The states that a call can be in. |
| 470 | */ |
| 471 | enum rxrpc_call_state { |
| 472 | RXRPC_CALL_UNINITIALISED, |
| 473 | RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */ |
| 474 | RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */ |
| 475 | RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */ |
| 476 | RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */ |
| 477 | RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */ |
| 478 | RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */ |
| 479 | RXRPC_CALL_SERVER_ACCEPTING, /* - server accepting request */ |
| 480 | RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */ |
| 481 | RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */ |
| 482 | RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */ |
| 483 | RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */ |
| 484 | RXRPC_CALL_COMPLETE, /* - call complete */ |
| 485 | NR__RXRPC_CALL_STATES |
| 486 | }; |
| 487 | |
| 488 | /* |
| 489 | * Call Tx congestion management modes. |
| 490 | */ |
| 491 | enum rxrpc_congest_mode { |
| 492 | RXRPC_CALL_SLOW_START, |
| 493 | RXRPC_CALL_CONGEST_AVOIDANCE, |
| 494 | RXRPC_CALL_PACKET_LOSS, |
| 495 | RXRPC_CALL_FAST_RETRANSMIT, |
| 496 | NR__RXRPC_CONGEST_MODES |
| 497 | }; |
| 498 | |
| 499 | /* |
| 500 | * RxRPC call definition |
| 501 | * - matched by { connection, call_id } |
| 502 | */ |
| 503 | struct rxrpc_call { |
| 504 | struct rcu_head rcu; |
| 505 | struct rxrpc_connection *conn; /* connection carrying call */ |
| 506 | struct rxrpc_peer *peer; /* Peer record for remote address */ |
| 507 | struct rxrpc_sock __rcu *socket; /* socket responsible */ |
| 508 | struct mutex user_mutex; /* User access mutex */ |
| 509 | ktime_t ack_at; /* When deferred ACK needs to happen */ |
| 510 | ktime_t resend_at; /* When next resend needs to happen */ |
| 511 | ktime_t ping_at; /* When next to send a ping */ |
| 512 | ktime_t expire_at; /* When the call times out */ |
| 513 | struct timer_list timer; /* Combined event timer */ |
| 514 | struct work_struct processor; /* Event processor */ |
| 515 | rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */ |
| 516 | struct list_head link; /* link in master call list */ |
| 517 | struct list_head chan_wait_link; /* Link in conn->waiting_calls */ |
| 518 | struct hlist_node error_link; /* link in error distribution list */ |
| 519 | struct list_head accept_link; /* Link in rx->acceptq */ |
| 520 | struct list_head recvmsg_link; /* Link in rx->recvmsg_q */ |
| 521 | struct list_head sock_link; /* Link in rx->sock_calls */ |
| 522 | struct rb_node sock_node; /* Node in rx->calls */ |
| 523 | struct sk_buff *tx_pending; /* Tx socket buffer being filled */ |
| 524 | wait_queue_head_t waitq; /* Wait queue for channel or Tx */ |
| 525 | s64 tx_total_len; /* Total length left to be transmitted (or -1) */ |
| 526 | __be32 crypto_buf[2]; /* Temporary packet crypto buffer */ |
| 527 | unsigned long user_call_ID; /* user-defined call ID */ |
| 528 | unsigned long flags; |
| 529 | unsigned long events; |
| 530 | spinlock_t lock; |
| 531 | rwlock_t state_lock; /* lock for state transition */ |
| 532 | u32 abort_code; /* Local/remote abort code */ |
| 533 | int error; /* Local error incurred */ |
| 534 | enum rxrpc_call_state state; /* current state of call */ |
| 535 | enum rxrpc_call_completion completion; /* Call completion condition */ |
| 536 | atomic_t usage; |
| 537 | u16 service_id; /* service ID */ |
| 538 | u8 security_ix; /* Security type */ |
| 539 | u32 call_id; /* call ID on connection */ |
| 540 | u32 cid; /* connection ID plus channel index */ |
| 541 | int debug_id; /* debug ID for printks */ |
| 542 | unsigned short rx_pkt_offset; /* Current recvmsg packet offset */ |
| 543 | unsigned short rx_pkt_len; /* Current recvmsg packet len */ |
| 544 | |
| 545 | /* Rx/Tx circular buffer, depending on phase. |
| 546 | * |
| 547 | * In the Rx phase, packets are annotated with 0 or the number of the |
| 548 | * segment of a jumbo packet each buffer refers to. There can be up to |
| 549 | * 47 segments in a maximum-size UDP packet. |
| 550 | * |
| 551 | * In the Tx phase, packets are annotated with which buffers have been |
| 552 | * acked. |
| 553 | */ |
| 554 | #define RXRPC_RXTX_BUFF_SIZE 64 |
| 555 | #define RXRPC_RXTX_BUFF_MASK (RXRPC_RXTX_BUFF_SIZE - 1) |
| 556 | #define RXRPC_INIT_RX_WINDOW_SIZE 32 |
| 557 | struct sk_buff **rxtx_buffer; |
| 558 | u8 *rxtx_annotations; |
| 559 | #define RXRPC_TX_ANNO_ACK 0 |
| 560 | #define RXRPC_TX_ANNO_UNACK 1 |
| 561 | #define RXRPC_TX_ANNO_NAK 2 |
| 562 | #define RXRPC_TX_ANNO_RETRANS 3 |
| 563 | #define RXRPC_TX_ANNO_MASK 0x03 |
| 564 | #define RXRPC_TX_ANNO_LAST 0x04 |
| 565 | #define RXRPC_TX_ANNO_RESENT 0x08 |
| 566 | |
| 567 | #define RXRPC_RX_ANNO_JUMBO 0x3f /* Jumbo subpacket number + 1 if not zero */ |
| 568 | #define RXRPC_RX_ANNO_JLAST 0x40 /* Set if last element of a jumbo packet */ |
| 569 | #define RXRPC_RX_ANNO_VERIFIED 0x80 /* Set if verified and decrypted */ |
| 570 | rxrpc_seq_t tx_hard_ack; /* Dead slot in buffer; the first transmitted but |
| 571 | * not hard-ACK'd packet follows this. |
| 572 | */ |
| 573 | rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */ |
| 574 | |
| 575 | /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS |
| 576 | * is fixed, we keep these numbers in terms of segments (ie. DATA |
| 577 | * packets) rather than bytes. |
| 578 | */ |
| 579 | #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN |
| 580 | u8 cong_cwnd; /* Congestion window size */ |
| 581 | u8 cong_extra; /* Extra to send for congestion management */ |
| 582 | u8 cong_ssthresh; /* Slow-start threshold */ |
| 583 | enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */ |
| 584 | u8 cong_dup_acks; /* Count of ACKs showing missing packets */ |
| 585 | u8 cong_cumul_acks; /* Cumulative ACK count */ |
| 586 | ktime_t cong_tstamp; /* Last time cwnd was changed */ |
| 587 | |
| 588 | rxrpc_seq_t rx_hard_ack; /* Dead slot in buffer; the first received but not |
| 589 | * consumed packet follows this. |
| 590 | */ |
| 591 | rxrpc_seq_t rx_top; /* Highest Rx slot allocated. */ |
| 592 | rxrpc_seq_t rx_expect_next; /* Expected next packet sequence number */ |
| 593 | u8 rx_winsize; /* Size of Rx window */ |
| 594 | u8 tx_winsize; /* Maximum size of Tx window */ |
| 595 | bool tx_phase; /* T if transmission phase, F if receive phase */ |
| 596 | u8 nr_jumbo_bad; /* Number of jumbo dups/exceeds-windows */ |
| 597 | |
| 598 | /* receive-phase ACK management */ |
| 599 | u8 ackr_reason; /* reason to ACK */ |
| 600 | u16 ackr_skew; /* skew on packet being ACK'd */ |
| 601 | rxrpc_serial_t ackr_serial; /* serial of packet being ACK'd */ |
| 602 | rxrpc_seq_t ackr_prev_seq; /* previous sequence number received */ |
| 603 | rxrpc_seq_t ackr_consumed; /* Highest packet shown consumed */ |
| 604 | rxrpc_seq_t ackr_seen; /* Highest packet shown seen */ |
| 605 | |
| 606 | /* ping management */ |
| 607 | rxrpc_serial_t ping_serial; /* Last ping sent */ |
| 608 | ktime_t ping_time; /* Time last ping sent */ |
| 609 | |
| 610 | /* transmission-phase ACK management */ |
| 611 | ktime_t acks_latest_ts; /* Timestamp of latest ACK received */ |
| 612 | rxrpc_serial_t acks_latest; /* serial number of latest ACK received */ |
| 613 | rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */ |
| 614 | }; |
| 615 | |
| 616 | /* |
| 617 | * Summary of a new ACK and the changes it made to the Tx buffer packet states. |
| 618 | */ |
| 619 | struct rxrpc_ack_summary { |
| 620 | u8 ack_reason; |
| 621 | u8 nr_acks; /* Number of ACKs in packet */ |
| 622 | u8 nr_nacks; /* Number of NACKs in packet */ |
| 623 | u8 nr_new_acks; /* Number of new ACKs in packet */ |
| 624 | u8 nr_new_nacks; /* Number of new NACKs in packet */ |
| 625 | u8 nr_rot_new_acks; /* Number of rotated new ACKs */ |
| 626 | bool new_low_nack; /* T if new low NACK found */ |
| 627 | bool retrans_timeo; /* T if reTx due to timeout happened */ |
| 628 | u8 flight_size; /* Number of unreceived transmissions */ |
| 629 | /* Place to stash values for tracing */ |
| 630 | enum rxrpc_congest_mode mode:8; |
| 631 | u8 cwnd; |
| 632 | u8 ssthresh; |
| 633 | u8 dup_acks; |
| 634 | u8 cumulative_acks; |
| 635 | }; |
| 636 | |
| 637 | #include <trace/events/rxrpc.h> |
| 638 | |
| 639 | /* |
| 640 | * af_rxrpc.c |
| 641 | */ |
| 642 | extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs; |
| 643 | extern atomic_t rxrpc_debug_id; |
| 644 | extern struct workqueue_struct *rxrpc_workqueue; |
| 645 | |
| 646 | /* |
| 647 | * call_accept.c |
| 648 | */ |
| 649 | int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t); |
| 650 | void rxrpc_discard_prealloc(struct rxrpc_sock *); |
| 651 | struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *, |
| 652 | struct rxrpc_connection *, |
| 653 | struct sk_buff *); |
| 654 | void rxrpc_accept_incoming_calls(struct rxrpc_local *); |
| 655 | struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long, |
| 656 | rxrpc_notify_rx_t); |
| 657 | int rxrpc_reject_call(struct rxrpc_sock *); |
| 658 | |
| 659 | /* |
| 660 | * call_event.c |
| 661 | */ |
| 662 | void __rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t); |
| 663 | void rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace, ktime_t); |
| 664 | void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool, |
| 665 | enum rxrpc_propose_ack_trace); |
| 666 | void rxrpc_process_call(struct work_struct *); |
| 667 | |
| 668 | /* |
| 669 | * call_object.c |
| 670 | */ |
| 671 | extern const char *const rxrpc_call_states[]; |
| 672 | extern const char *const rxrpc_call_completions[]; |
| 673 | extern unsigned int rxrpc_max_call_lifetime; |
| 674 | extern struct kmem_cache *rxrpc_call_jar; |
| 675 | |
| 676 | struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long); |
| 677 | struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t); |
| 678 | struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *, |
| 679 | struct rxrpc_conn_parameters *, |
| 680 | struct sockaddr_rxrpc *, |
| 681 | unsigned long, s64, gfp_t); |
| 682 | int rxrpc_retry_client_call(struct rxrpc_sock *, |
| 683 | struct rxrpc_call *, |
| 684 | struct rxrpc_conn_parameters *, |
| 685 | struct sockaddr_rxrpc *, |
| 686 | gfp_t); |
| 687 | void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *, |
| 688 | struct sk_buff *); |
| 689 | void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *); |
| 690 | int rxrpc_prepare_call_for_retry(struct rxrpc_sock *, struct rxrpc_call *); |
| 691 | void rxrpc_release_calls_on_socket(struct rxrpc_sock *); |
| 692 | bool __rxrpc_queue_call(struct rxrpc_call *); |
| 693 | bool rxrpc_queue_call(struct rxrpc_call *); |
| 694 | void rxrpc_see_call(struct rxrpc_call *); |
| 695 | void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace); |
| 696 | void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace); |
| 697 | void rxrpc_cleanup_call(struct rxrpc_call *); |
| 698 | void rxrpc_destroy_all_calls(struct rxrpc_net *); |
| 699 | |
| 700 | static inline bool rxrpc_is_service_call(const struct rxrpc_call *call) |
| 701 | { |
| 702 | return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags); |
| 703 | } |
| 704 | |
| 705 | static inline bool rxrpc_is_client_call(const struct rxrpc_call *call) |
| 706 | { |
| 707 | return !rxrpc_is_service_call(call); |
| 708 | } |
| 709 | |
| 710 | /* |
| 711 | * Transition a call to the complete state. |
| 712 | */ |
| 713 | static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call, |
| 714 | enum rxrpc_call_completion compl, |
| 715 | u32 abort_code, |
| 716 | int error) |
| 717 | { |
| 718 | if (call->state < RXRPC_CALL_COMPLETE) { |
| 719 | call->abort_code = abort_code; |
| 720 | call->error = error; |
| 721 | call->completion = compl, |
| 722 | call->state = RXRPC_CALL_COMPLETE; |
| 723 | wake_up(&call->waitq); |
| 724 | return true; |
| 725 | } |
| 726 | return false; |
| 727 | } |
| 728 | |
| 729 | static inline bool rxrpc_set_call_completion(struct rxrpc_call *call, |
| 730 | enum rxrpc_call_completion compl, |
| 731 | u32 abort_code, |
| 732 | int error) |
| 733 | { |
| 734 | bool ret; |
| 735 | |
| 736 | write_lock_bh(&call->state_lock); |
| 737 | ret = __rxrpc_set_call_completion(call, compl, abort_code, error); |
| 738 | write_unlock_bh(&call->state_lock); |
| 739 | return ret; |
| 740 | } |
| 741 | |
| 742 | /* |
| 743 | * Record that a call successfully completed. |
| 744 | */ |
| 745 | static inline bool __rxrpc_call_completed(struct rxrpc_call *call) |
| 746 | { |
| 747 | return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0); |
| 748 | } |
| 749 | |
| 750 | static inline bool rxrpc_call_completed(struct rxrpc_call *call) |
| 751 | { |
| 752 | bool ret; |
| 753 | |
| 754 | write_lock_bh(&call->state_lock); |
| 755 | ret = __rxrpc_call_completed(call); |
| 756 | write_unlock_bh(&call->state_lock); |
| 757 | return ret; |
| 758 | } |
| 759 | |
| 760 | /* |
| 761 | * Record that a call is locally aborted. |
| 762 | */ |
| 763 | static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call, |
| 764 | rxrpc_seq_t seq, |
| 765 | u32 abort_code, int error) |
| 766 | { |
| 767 | trace_rxrpc_abort(why, call->cid, call->call_id, seq, |
| 768 | abort_code, error); |
| 769 | return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED, |
| 770 | abort_code, error); |
| 771 | } |
| 772 | |
| 773 | static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call, |
| 774 | rxrpc_seq_t seq, u32 abort_code, int error) |
| 775 | { |
| 776 | bool ret; |
| 777 | |
| 778 | write_lock_bh(&call->state_lock); |
| 779 | ret = __rxrpc_abort_call(why, call, seq, abort_code, error); |
| 780 | write_unlock_bh(&call->state_lock); |
| 781 | return ret; |
| 782 | } |
| 783 | |
| 784 | /* |
| 785 | * Abort a call due to a protocol error. |
| 786 | */ |
| 787 | static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call, |
| 788 | struct sk_buff *skb, |
| 789 | const char *eproto_why, |
| 790 | const char *why, |
| 791 | u32 abort_code) |
| 792 | { |
| 793 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
| 794 | |
| 795 | trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why); |
| 796 | return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO); |
| 797 | } |
| 798 | |
| 799 | #define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \ |
| 800 | __rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \ |
| 801 | (abort_why), (abort_code)) |
| 802 | |
| 803 | /* |
| 804 | * conn_client.c |
| 805 | */ |
| 806 | extern unsigned int rxrpc_max_client_connections; |
| 807 | extern unsigned int rxrpc_reap_client_connections; |
| 808 | extern unsigned int rxrpc_conn_idle_client_expiry; |
| 809 | extern unsigned int rxrpc_conn_idle_client_fast_expiry; |
| 810 | extern struct idr rxrpc_client_conn_ids; |
| 811 | |
| 812 | void rxrpc_destroy_client_conn_ids(void); |
| 813 | int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *, |
| 814 | struct sockaddr_rxrpc *, gfp_t); |
| 815 | void rxrpc_expose_client_call(struct rxrpc_call *); |
| 816 | void rxrpc_disconnect_client_call(struct rxrpc_call *); |
| 817 | void rxrpc_put_client_conn(struct rxrpc_connection *); |
| 818 | void rxrpc_discard_expired_client_conns(struct work_struct *); |
| 819 | void rxrpc_destroy_all_client_connections(struct rxrpc_net *); |
| 820 | |
| 821 | /* |
| 822 | * conn_event.c |
| 823 | */ |
| 824 | void rxrpc_process_connection(struct work_struct *); |
| 825 | |
| 826 | /* |
| 827 | * conn_object.c |
| 828 | */ |
| 829 | extern unsigned int rxrpc_connection_expiry; |
| 830 | extern unsigned int rxrpc_closed_conn_expiry; |
| 831 | |
| 832 | struct rxrpc_connection *rxrpc_alloc_connection(gfp_t); |
| 833 | struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *, |
| 834 | struct sk_buff *); |
| 835 | void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *); |
| 836 | void rxrpc_disconnect_call(struct rxrpc_call *); |
| 837 | void rxrpc_kill_connection(struct rxrpc_connection *); |
| 838 | bool rxrpc_queue_conn(struct rxrpc_connection *); |
| 839 | void rxrpc_see_connection(struct rxrpc_connection *); |
| 840 | void rxrpc_get_connection(struct rxrpc_connection *); |
| 841 | struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *); |
| 842 | void rxrpc_put_service_conn(struct rxrpc_connection *); |
| 843 | void rxrpc_service_connection_reaper(struct work_struct *); |
| 844 | void rxrpc_destroy_all_connections(struct rxrpc_net *); |
| 845 | |
| 846 | static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn) |
| 847 | { |
| 848 | return conn->out_clientflag; |
| 849 | } |
| 850 | |
| 851 | static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn) |
| 852 | { |
| 853 | return !rxrpc_conn_is_client(conn); |
| 854 | } |
| 855 | |
| 856 | static inline void rxrpc_put_connection(struct rxrpc_connection *conn) |
| 857 | { |
| 858 | if (!conn) |
| 859 | return; |
| 860 | |
| 861 | if (rxrpc_conn_is_client(conn)) |
| 862 | rxrpc_put_client_conn(conn); |
| 863 | else |
| 864 | rxrpc_put_service_conn(conn); |
| 865 | } |
| 866 | |
| 867 | /* |
| 868 | * conn_service.c |
| 869 | */ |
| 870 | struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *, |
| 871 | struct sk_buff *); |
| 872 | struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t); |
| 873 | void rxrpc_new_incoming_connection(struct rxrpc_sock *, |
| 874 | struct rxrpc_connection *, struct sk_buff *); |
| 875 | void rxrpc_unpublish_service_conn(struct rxrpc_connection *); |
| 876 | |
| 877 | /* |
| 878 | * input.c |
| 879 | */ |
| 880 | void rxrpc_data_ready(struct sock *); |
| 881 | |
| 882 | /* |
| 883 | * insecure.c |
| 884 | */ |
| 885 | extern const struct rxrpc_security rxrpc_no_security; |
| 886 | |
| 887 | /* |
| 888 | * key.c |
| 889 | */ |
| 890 | extern struct key_type key_type_rxrpc; |
| 891 | extern struct key_type key_type_rxrpc_s; |
| 892 | |
| 893 | int rxrpc_request_key(struct rxrpc_sock *, char __user *, int); |
| 894 | int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int); |
| 895 | int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t, |
| 896 | u32); |
| 897 | |
| 898 | /* |
| 899 | * local_event.c |
| 900 | */ |
| 901 | extern void rxrpc_process_local_events(struct rxrpc_local *); |
| 902 | |
| 903 | /* |
| 904 | * local_object.c |
| 905 | */ |
| 906 | struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *); |
| 907 | void __rxrpc_put_local(struct rxrpc_local *); |
| 908 | void rxrpc_destroy_all_locals(struct rxrpc_net *); |
| 909 | |
| 910 | static inline void rxrpc_get_local(struct rxrpc_local *local) |
| 911 | { |
| 912 | atomic_inc(&local->usage); |
| 913 | } |
| 914 | |
| 915 | static inline |
| 916 | struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local) |
| 917 | { |
| 918 | return atomic_inc_not_zero(&local->usage) ? local : NULL; |
| 919 | } |
| 920 | |
| 921 | static inline void rxrpc_put_local(struct rxrpc_local *local) |
| 922 | { |
| 923 | if (local && atomic_dec_and_test(&local->usage)) |
| 924 | __rxrpc_put_local(local); |
| 925 | } |
| 926 | |
| 927 | static inline void rxrpc_queue_local(struct rxrpc_local *local) |
| 928 | { |
| 929 | rxrpc_queue_work(&local->processor); |
| 930 | } |
| 931 | |
| 932 | /* |
| 933 | * misc.c |
| 934 | */ |
| 935 | extern unsigned int rxrpc_max_backlog __read_mostly; |
| 936 | extern unsigned int rxrpc_requested_ack_delay; |
| 937 | extern unsigned int rxrpc_soft_ack_delay; |
| 938 | extern unsigned int rxrpc_idle_ack_delay; |
| 939 | extern unsigned int rxrpc_rx_window_size; |
| 940 | extern unsigned int rxrpc_rx_mtu; |
| 941 | extern unsigned int rxrpc_rx_jumbo_max; |
| 942 | extern unsigned int rxrpc_resend_timeout; |
| 943 | |
| 944 | extern const s8 rxrpc_ack_priority[]; |
| 945 | |
| 946 | /* |
| 947 | * net_ns.c |
| 948 | */ |
| 949 | extern unsigned int rxrpc_net_id; |
| 950 | extern struct pernet_operations rxrpc_net_ops; |
| 951 | |
| 952 | static inline struct rxrpc_net *rxrpc_net(struct net *net) |
| 953 | { |
| 954 | return net_generic(net, rxrpc_net_id); |
| 955 | } |
| 956 | |
| 957 | /* |
| 958 | * output.c |
| 959 | */ |
| 960 | int rxrpc_send_ack_packet(struct rxrpc_call *, bool); |
| 961 | int rxrpc_send_abort_packet(struct rxrpc_call *); |
| 962 | int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool); |
| 963 | void rxrpc_reject_packets(struct rxrpc_local *); |
| 964 | |
| 965 | /* |
| 966 | * peer_event.c |
| 967 | */ |
| 968 | void rxrpc_error_report(struct sock *); |
| 969 | void rxrpc_peer_error_distributor(struct work_struct *); |
| 970 | void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, |
| 971 | rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t); |
| 972 | |
| 973 | /* |
| 974 | * peer_object.c |
| 975 | */ |
| 976 | struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *, |
| 977 | const struct sockaddr_rxrpc *); |
| 978 | struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *, |
| 979 | struct sockaddr_rxrpc *, gfp_t); |
| 980 | struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t); |
| 981 | struct rxrpc_peer *rxrpc_lookup_incoming_peer(struct rxrpc_local *, |
| 982 | struct rxrpc_peer *); |
| 983 | |
| 984 | static inline struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer) |
| 985 | { |
| 986 | atomic_inc(&peer->usage); |
| 987 | return peer; |
| 988 | } |
| 989 | |
| 990 | static inline |
| 991 | struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer) |
| 992 | { |
| 993 | return atomic_inc_not_zero(&peer->usage) ? peer : NULL; |
| 994 | } |
| 995 | |
| 996 | extern void __rxrpc_put_peer(struct rxrpc_peer *peer); |
| 997 | static inline void rxrpc_put_peer(struct rxrpc_peer *peer) |
| 998 | { |
| 999 | if (peer && atomic_dec_and_test(&peer->usage)) |
| 1000 | __rxrpc_put_peer(peer); |
| 1001 | } |
| 1002 | |
| 1003 | /* |
| 1004 | * proc.c |
| 1005 | */ |
| 1006 | extern const struct file_operations rxrpc_call_seq_fops; |
| 1007 | extern const struct file_operations rxrpc_connection_seq_fops; |
| 1008 | |
| 1009 | /* |
| 1010 | * recvmsg.c |
| 1011 | */ |
| 1012 | void rxrpc_notify_socket(struct rxrpc_call *); |
| 1013 | int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int); |
| 1014 | |
| 1015 | /* |
| 1016 | * rxkad.c |
| 1017 | */ |
| 1018 | #ifdef CONFIG_RXKAD |
| 1019 | extern const struct rxrpc_security rxkad; |
| 1020 | #endif |
| 1021 | |
| 1022 | /* |
| 1023 | * security.c |
| 1024 | */ |
| 1025 | int __init rxrpc_init_security(void); |
| 1026 | void rxrpc_exit_security(void); |
| 1027 | int rxrpc_init_client_conn_security(struct rxrpc_connection *); |
| 1028 | int rxrpc_init_server_conn_security(struct rxrpc_connection *); |
| 1029 | |
| 1030 | /* |
| 1031 | * sendmsg.c |
| 1032 | */ |
| 1033 | int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t); |
| 1034 | |
| 1035 | /* |
| 1036 | * skbuff.c |
| 1037 | */ |
| 1038 | void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *); |
| 1039 | void rxrpc_packet_destructor(struct sk_buff *); |
| 1040 | void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace); |
| 1041 | void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace); |
| 1042 | void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace); |
| 1043 | void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace); |
| 1044 | void rxrpc_lose_skb(struct sk_buff *, enum rxrpc_skb_trace); |
| 1045 | void rxrpc_purge_queue(struct sk_buff_head *); |
| 1046 | |
| 1047 | /* |
| 1048 | * sysctl.c |
| 1049 | */ |
| 1050 | #ifdef CONFIG_SYSCTL |
| 1051 | extern int __init rxrpc_sysctl_init(void); |
| 1052 | extern void rxrpc_sysctl_exit(void); |
| 1053 | #else |
| 1054 | static inline int __init rxrpc_sysctl_init(void) { return 0; } |
| 1055 | static inline void rxrpc_sysctl_exit(void) {} |
| 1056 | #endif |
| 1057 | |
| 1058 | /* |
| 1059 | * utils.c |
| 1060 | */ |
| 1061 | int rxrpc_extract_addr_from_skb(struct rxrpc_local *, struct sockaddr_rxrpc *, |
| 1062 | struct sk_buff *); |
| 1063 | |
| 1064 | static inline bool before(u32 seq1, u32 seq2) |
| 1065 | { |
| 1066 | return (s32)(seq1 - seq2) < 0; |
| 1067 | } |
| 1068 | static inline bool before_eq(u32 seq1, u32 seq2) |
| 1069 | { |
| 1070 | return (s32)(seq1 - seq2) <= 0; |
| 1071 | } |
| 1072 | static inline bool after(u32 seq1, u32 seq2) |
| 1073 | { |
| 1074 | return (s32)(seq1 - seq2) > 0; |
| 1075 | } |
| 1076 | static inline bool after_eq(u32 seq1, u32 seq2) |
| 1077 | { |
| 1078 | return (s32)(seq1 - seq2) >= 0; |
| 1079 | } |
| 1080 | |
| 1081 | /* |
| 1082 | * debug tracing |
| 1083 | */ |
| 1084 | extern unsigned int rxrpc_debug; |
| 1085 | |
| 1086 | #define dbgprintk(FMT,...) \ |
| 1087 | printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) |
| 1088 | |
| 1089 | #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) |
| 1090 | #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) |
| 1091 | #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) |
| 1092 | #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__) |
| 1093 | #define knet(FMT,...) dbgprintk("@@@ "FMT ,##__VA_ARGS__) |
| 1094 | |
| 1095 | |
| 1096 | #if defined(__KDEBUG) |
| 1097 | #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) |
| 1098 | #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) |
| 1099 | #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) |
| 1100 | #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__) |
| 1101 | #define _net(FMT,...) knet(FMT,##__VA_ARGS__) |
| 1102 | |
| 1103 | #elif defined(CONFIG_AF_RXRPC_DEBUG) |
| 1104 | #define RXRPC_DEBUG_KENTER 0x01 |
| 1105 | #define RXRPC_DEBUG_KLEAVE 0x02 |
| 1106 | #define RXRPC_DEBUG_KDEBUG 0x04 |
| 1107 | #define RXRPC_DEBUG_KPROTO 0x08 |
| 1108 | #define RXRPC_DEBUG_KNET 0x10 |
| 1109 | |
| 1110 | #define _enter(FMT,...) \ |
| 1111 | do { \ |
| 1112 | if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \ |
| 1113 | kenter(FMT,##__VA_ARGS__); \ |
| 1114 | } while (0) |
| 1115 | |
| 1116 | #define _leave(FMT,...) \ |
| 1117 | do { \ |
| 1118 | if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \ |
| 1119 | kleave(FMT,##__VA_ARGS__); \ |
| 1120 | } while (0) |
| 1121 | |
| 1122 | #define _debug(FMT,...) \ |
| 1123 | do { \ |
| 1124 | if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \ |
| 1125 | kdebug(FMT,##__VA_ARGS__); \ |
| 1126 | } while (0) |
| 1127 | |
| 1128 | #define _proto(FMT,...) \ |
| 1129 | do { \ |
| 1130 | if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \ |
| 1131 | kproto(FMT,##__VA_ARGS__); \ |
| 1132 | } while (0) |
| 1133 | |
| 1134 | #define _net(FMT,...) \ |
| 1135 | do { \ |
| 1136 | if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET)) \ |
| 1137 | knet(FMT,##__VA_ARGS__); \ |
| 1138 | } while (0) |
| 1139 | |
| 1140 | #else |
| 1141 | #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) |
| 1142 | #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) |
| 1143 | #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) |
| 1144 | #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__) |
| 1145 | #define _net(FMT,...) no_printk("@@@ "FMT ,##__VA_ARGS__) |
| 1146 | #endif |
| 1147 | |
| 1148 | /* |
| 1149 | * debug assertion checking |
| 1150 | */ |
| 1151 | #if 1 // defined(__KDEBUGALL) |
| 1152 | |
| 1153 | #define ASSERT(X) \ |
| 1154 | do { \ |
| 1155 | if (unlikely(!(X))) { \ |
| 1156 | pr_err("Assertion failed\n"); \ |
| 1157 | BUG(); \ |
| 1158 | } \ |
| 1159 | } while (0) |
| 1160 | |
| 1161 | #define ASSERTCMP(X, OP, Y) \ |
| 1162 | do { \ |
| 1163 | __typeof__(X) _x = (X); \ |
| 1164 | __typeof__(Y) _y = (__typeof__(X))(Y); \ |
| 1165 | if (unlikely(!(_x OP _y))) { \ |
| 1166 | pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ |
| 1167 | (unsigned long)_x, (unsigned long)_x, #OP, \ |
| 1168 | (unsigned long)_y, (unsigned long)_y); \ |
| 1169 | BUG(); \ |
| 1170 | } \ |
| 1171 | } while (0) |
| 1172 | |
| 1173 | #define ASSERTIF(C, X) \ |
| 1174 | do { \ |
| 1175 | if (unlikely((C) && !(X))) { \ |
| 1176 | pr_err("Assertion failed\n"); \ |
| 1177 | BUG(); \ |
| 1178 | } \ |
| 1179 | } while (0) |
| 1180 | |
| 1181 | #define ASSERTIFCMP(C, X, OP, Y) \ |
| 1182 | do { \ |
| 1183 | __typeof__(X) _x = (X); \ |
| 1184 | __typeof__(Y) _y = (__typeof__(X))(Y); \ |
| 1185 | if (unlikely((C) && !(_x OP _y))) { \ |
| 1186 | pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ |
| 1187 | (unsigned long)_x, (unsigned long)_x, #OP, \ |
| 1188 | (unsigned long)_y, (unsigned long)_y); \ |
| 1189 | BUG(); \ |
| 1190 | } \ |
| 1191 | } while (0) |
| 1192 | |
| 1193 | #else |
| 1194 | |
| 1195 | #define ASSERT(X) \ |
| 1196 | do { \ |
| 1197 | } while (0) |
| 1198 | |
| 1199 | #define ASSERTCMP(X, OP, Y) \ |
| 1200 | do { \ |
| 1201 | } while (0) |
| 1202 | |
| 1203 | #define ASSERTIF(C, X) \ |
| 1204 | do { \ |
| 1205 | } while (0) |
| 1206 | |
| 1207 | #define ASSERTIFCMP(C, X, OP, Y) \ |
| 1208 | do { \ |
| 1209 | } while (0) |
| 1210 | |
| 1211 | #endif /* __KDEBUGALL */ |