| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 2 | /* AF_RXRPC internal definitions |
| 3 | * |
| 4 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| 5 | * Written by David Howells (dhowells@redhat.com) |
| 6 | */ |
| 7 | |
| 8 | #include <linux/atomic.h> |
| 9 | #include <linux/seqlock.h> |
| 10 | #include <linux/win_minmax.h> |
| 11 | #include <net/net_namespace.h> |
| 12 | #include <net/netns/generic.h> |
| 13 | #include <net/sock.h> |
| 14 | #include <net/af_rxrpc.h> |
| 15 | #include <keys/rxrpc-type.h> |
| 16 | #include "protocol.h" |
| 17 | |
| 18 | #define FCRYPT_BSIZE 8 |
| 19 | struct rxrpc_crypt { |
| 20 | union { |
| 21 | u8 x[FCRYPT_BSIZE]; |
| 22 | __be32 n[2]; |
| 23 | }; |
| 24 | } __attribute__((aligned(8))); |
| 25 | |
| 26 | #define rxrpc_queue_work(WS) queue_work(rxrpc_workqueue, (WS)) |
| 27 | #define rxrpc_queue_delayed_work(WS,D) \ |
| 28 | queue_delayed_work(rxrpc_workqueue, (WS), (D)) |
| 29 | |
| 30 | struct key_preparsed_payload; |
| 31 | struct rxrpc_connection; |
| 32 | struct rxrpc_txbuf; |
| 33 | struct rxrpc_txqueue; |
| 34 | struct rxgk_context; |
| 35 | |
| 36 | /* |
| 37 | * Mark applied to socket buffers in skb->mark. skb->priority is used |
| 38 | * to pass supplementary information. |
| 39 | */ |
| 40 | enum rxrpc_skb_mark { |
| 41 | RXRPC_SKB_MARK_PACKET, /* Received packet */ |
| 42 | RXRPC_SKB_MARK_ERROR, /* Error notification */ |
| 43 | RXRPC_SKB_MARK_CHALLENGE, /* Challenge notification */ |
| 44 | RXRPC_SKB_MARK_SERVICE_CONN_SECURED, /* Service connection response has been verified */ |
| 45 | RXRPC_SKB_MARK_REJECT_BUSY, /* Reject with BUSY */ |
| 46 | RXRPC_SKB_MARK_REJECT_ABORT, /* Reject with ABORT (code in skb->priority) */ |
| 47 | }; |
| 48 | |
| 49 | /* |
| 50 | * sk_state for RxRPC sockets |
| 51 | */ |
| 52 | enum { |
| 53 | RXRPC_UNBOUND = 0, |
| 54 | RXRPC_CLIENT_UNBOUND, /* Unbound socket used as client */ |
| 55 | RXRPC_CLIENT_BOUND, /* client local address bound */ |
| 56 | RXRPC_SERVER_BOUND, /* server local address bound */ |
| 57 | RXRPC_SERVER_BOUND2, /* second server local address bound */ |
| 58 | RXRPC_SERVER_LISTENING, /* server listening for connections */ |
| 59 | RXRPC_SERVER_LISTEN_DISABLED, /* server listening disabled */ |
| 60 | RXRPC_CLOSE, /* socket is being closed */ |
| 61 | }; |
| 62 | |
| 63 | /* |
| 64 | * Per-network namespace data. |
| 65 | */ |
| 66 | struct rxrpc_net { |
| 67 | struct proc_dir_entry *proc_net; /* Subdir in /proc/net */ |
| 68 | u32 epoch; /* Local epoch for detecting local-end reset */ |
| 69 | struct list_head calls; /* List of calls active in this namespace */ |
| 70 | spinlock_t call_lock; /* Lock for ->calls */ |
| 71 | atomic_t nr_calls; /* Count of allocated calls */ |
| 72 | |
| 73 | atomic_t nr_conns; |
| 74 | struct list_head bundle_proc_list; /* List of bundles for proc */ |
| 75 | struct list_head conn_proc_list; /* List of conns in this namespace for proc */ |
| 76 | struct list_head service_conns; /* Service conns in this namespace */ |
| 77 | rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */ |
| 78 | struct work_struct service_conn_reaper; |
| 79 | struct timer_list service_conn_reap_timer; |
| 80 | |
| 81 | bool live; |
| 82 | |
| 83 | atomic_t nr_client_conns; |
| 84 | |
| 85 | struct hlist_head local_endpoints; |
| 86 | struct mutex local_mutex; /* Lock for ->local_endpoints */ |
| 87 | |
| 88 | DECLARE_HASHTABLE (peer_hash, 10); |
| 89 | spinlock_t peer_hash_lock; /* Lock for ->peer_hash */ |
| 90 | |
| 91 | #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */ |
| 92 | u8 peer_keepalive_cursor; |
| 93 | time64_t peer_keepalive_base; |
| 94 | struct list_head peer_keepalive[32]; |
| 95 | struct list_head peer_keepalive_new; |
| 96 | struct timer_list peer_keepalive_timer; |
| 97 | struct work_struct peer_keepalive_work; |
| 98 | |
| 99 | atomic_t stat_tx_data; |
| 100 | atomic_t stat_tx_data_retrans; |
| 101 | atomic_t stat_tx_data_send; |
| 102 | atomic_t stat_tx_data_send_frag; |
| 103 | atomic_t stat_tx_data_send_fail; |
| 104 | atomic_t stat_tx_data_send_msgsize; |
| 105 | atomic_t stat_tx_data_underflow; |
| 106 | atomic_t stat_tx_data_cwnd_reset; |
| 107 | atomic_t stat_rx_data; |
| 108 | atomic_t stat_rx_data_reqack; |
| 109 | atomic_t stat_rx_data_jumbo; |
| 110 | |
| 111 | atomic_t stat_tx_ack_fill; |
| 112 | atomic_t stat_tx_ack_send; |
| 113 | atomic_t stat_tx_ack_skip; |
| 114 | atomic_t stat_tx_acks[256]; |
| 115 | atomic_t stat_rx_acks[256]; |
| 116 | atomic_t stat_tx_jumbo[10]; |
| 117 | atomic_t stat_rx_jumbo[10]; |
| 118 | |
| 119 | atomic_t stat_why_req_ack[8]; |
| 120 | |
| 121 | atomic_t stat_io_loop; |
| 122 | }; |
| 123 | |
| 124 | /* |
| 125 | * Service backlog preallocation. |
| 126 | * |
| 127 | * This contains circular buffers of preallocated peers, connections and calls |
| 128 | * for incoming service calls and their head and tail pointers. This allows |
| 129 | * calls to be set up in the data_ready handler, thereby avoiding the need to |
| 130 | * shuffle packets around so much. |
| 131 | */ |
| 132 | struct rxrpc_backlog { |
| 133 | unsigned short peer_backlog_head; |
| 134 | unsigned short peer_backlog_tail; |
| 135 | unsigned short conn_backlog_head; |
| 136 | unsigned short conn_backlog_tail; |
| 137 | unsigned short call_backlog_head; |
| 138 | unsigned short call_backlog_tail; |
| 139 | #define RXRPC_BACKLOG_MAX 32 |
| 140 | struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX]; |
| 141 | struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX]; |
| 142 | struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX]; |
| 143 | }; |
| 144 | |
| 145 | /* |
| 146 | * RxRPC socket definition |
| 147 | */ |
| 148 | struct rxrpc_sock { |
| 149 | /* WARNING: sk has to be the first member */ |
| 150 | struct sock sk; |
| 151 | const struct rxrpc_kernel_ops *app_ops; /* Table of kernel app notification funcs */ |
| 152 | struct rxrpc_local *local; /* local endpoint */ |
| 153 | struct rxrpc_backlog *backlog; /* Preallocation for services */ |
| 154 | struct sk_buff_head recvmsg_oobq; /* OOB messages for recvmsg to pick up */ |
| 155 | struct rb_root pending_oobq; /* OOB messages awaiting userspace to respond to */ |
| 156 | u64 oob_id_counter; /* OOB message ID counter */ |
| 157 | spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */ |
| 158 | struct list_head sock_calls; /* List of calls owned by this socket */ |
| 159 | struct list_head to_be_accepted; /* calls awaiting acceptance */ |
| 160 | struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */ |
| 161 | spinlock_t recvmsg_lock; /* Lock for recvmsg_q */ |
| 162 | struct key *key; /* security for this socket */ |
| 163 | struct key *securities; /* list of server security descriptors */ |
| 164 | struct rb_root calls; /* User ID -> call mapping */ |
| 165 | unsigned long flags; |
| 166 | #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */ |
| 167 | #define RXRPC_SOCK_MANAGE_RESPONSE 1 /* User wants to manage RESPONSE packets */ |
| 168 | rwlock_t call_lock; /* lock for calls */ |
| 169 | u32 min_sec_level; /* minimum security level */ |
| 170 | #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT |
| 171 | bool exclusive; /* Exclusive connection for a client socket */ |
| 172 | u16 second_service; /* Additional service bound to the endpoint */ |
| 173 | struct { |
| 174 | /* Service upgrade information */ |
| 175 | u16 from; /* Service ID to upgrade (if not 0) */ |
| 176 | u16 to; /* service ID to upgrade to */ |
| 177 | } service_upgrade; |
| 178 | sa_family_t family; /* Protocol family created with */ |
| 179 | struct sockaddr_rxrpc srx; /* Primary Service/local addresses */ |
| 180 | struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */ |
| 181 | }; |
| 182 | |
| 183 | #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk) |
| 184 | |
| 185 | /* |
| 186 | * CPU-byteorder normalised Rx packet header. |
| 187 | */ |
| 188 | struct rxrpc_host_header { |
| 189 | u32 epoch; /* client boot timestamp */ |
| 190 | u32 cid; /* connection and channel ID */ |
| 191 | u32 callNumber; /* call ID (0 for connection-level packets) */ |
| 192 | u32 seq; /* sequence number of pkt in call stream */ |
| 193 | u32 serial; /* serial number of pkt sent to network */ |
| 194 | u8 type; /* packet type */ |
| 195 | u8 flags; /* packet flags */ |
| 196 | u8 userStatus; /* app-layer defined status */ |
| 197 | u8 securityIndex; /* security protocol ID */ |
| 198 | union { |
| 199 | u16 _rsvd; /* reserved */ |
| 200 | u16 cksum; /* kerberos security checksum */ |
| 201 | }; |
| 202 | u16 serviceId; /* service ID */ |
| 203 | } __packed; |
| 204 | |
| 205 | /* |
| 206 | * RxRPC socket buffer private variables |
| 207 | * - max 48 bytes (struct sk_buff::cb) |
| 208 | */ |
| 209 | struct rxrpc_skb_priv { |
| 210 | union { |
| 211 | struct rxrpc_connection *poke_conn; /* Conn referred to (poke packet) */ |
| 212 | struct { |
| 213 | u16 offset; /* Offset of data */ |
| 214 | u16 len; /* Length of data */ |
| 215 | u8 flags; |
| 216 | #define RXRPC_RX_VERIFIED 0x01 |
| 217 | }; |
| 218 | struct { |
| 219 | rxrpc_seq_t first_ack; /* First packet in acks table */ |
| 220 | rxrpc_seq_t prev_ack; /* Highest seq seen */ |
| 221 | rxrpc_serial_t acked_serial; /* Packet in response to (or 0) */ |
| 222 | u16 nr_acks; /* Number of acks+nacks */ |
| 223 | u8 reason; /* Reason for ack */ |
| 224 | } ack; |
| 225 | struct { |
| 226 | struct rxrpc_connection *conn; /* Connection referred to */ |
| 227 | union { |
| 228 | u32 rxkad_nonce; |
| 229 | }; |
| 230 | } chall; |
| 231 | struct { |
| 232 | rxrpc_serial_t challenge_serial; |
| 233 | u32 kvno; |
| 234 | u32 version; |
| 235 | u16 len; |
| 236 | u16 ticket_len; |
| 237 | } resp; |
| 238 | }; |
| 239 | struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */ |
| 240 | }; |
| 241 | |
| 242 | #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb) |
| 243 | |
| 244 | /* |
| 245 | * RxRPC security module interface |
| 246 | */ |
| 247 | struct rxrpc_security { |
| 248 | const char *name; /* name of this service */ |
| 249 | u8 security_index; /* security type provided */ |
| 250 | u32 no_key_abort; /* Abort code indicating no key */ |
| 251 | |
| 252 | /* Initialise a security service */ |
| 253 | int (*init)(void); |
| 254 | |
| 255 | /* Clean up a security service */ |
| 256 | void (*exit)(void); |
| 257 | |
| 258 | /* Parse the information from a server key */ |
| 259 | int (*preparse_server_key)(struct key_preparsed_payload *); |
| 260 | |
| 261 | /* Clean up the preparse buffer after parsing a server key */ |
| 262 | void (*free_preparse_server_key)(struct key_preparsed_payload *); |
| 263 | |
| 264 | /* Destroy the payload of a server key */ |
| 265 | void (*destroy_server_key)(struct key *); |
| 266 | |
| 267 | /* Describe a server key */ |
| 268 | void (*describe_server_key)(const struct key *, struct seq_file *); |
| 269 | |
| 270 | /* initialise a connection's security */ |
| 271 | int (*init_connection_security)(struct rxrpc_connection *, |
| 272 | struct rxrpc_key_token *); |
| 273 | |
| 274 | /* Work out how much data we can store in a packet, given an estimate |
| 275 | * of the amount of data remaining and allocate a data buffer. |
| 276 | */ |
| 277 | struct rxrpc_txbuf *(*alloc_txbuf)(struct rxrpc_call *call, size_t remaining, gfp_t gfp); |
| 278 | |
| 279 | /* impose security on a packet */ |
| 280 | int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *); |
| 281 | |
| 282 | /* verify the security on a received packet */ |
| 283 | int (*verify_packet)(struct rxrpc_call *, struct sk_buff *); |
| 284 | |
| 285 | /* Free crypto request on a call */ |
| 286 | void (*free_call_crypto)(struct rxrpc_call *); |
| 287 | |
| 288 | /* issue a challenge */ |
| 289 | int (*issue_challenge)(struct rxrpc_connection *); |
| 290 | |
| 291 | /* Validate a challenge packet */ |
| 292 | bool (*validate_challenge)(struct rxrpc_connection *conn, |
| 293 | struct sk_buff *skb); |
| 294 | |
| 295 | /* Fill out the cmsg for recvmsg() to pass on a challenge to userspace. |
| 296 | * The security class gets to add additional information. |
| 297 | */ |
| 298 | int (*challenge_to_recvmsg)(struct rxrpc_connection *conn, |
| 299 | struct sk_buff *challenge, |
| 300 | struct msghdr *msg); |
| 301 | |
| 302 | /* Parse sendmsg() control message and respond to challenge. */ |
| 303 | int (*sendmsg_respond_to_challenge)(struct sk_buff *challenge, |
| 304 | struct msghdr *msg); |
| 305 | |
| 306 | /* respond to a challenge */ |
| 307 | int (*respond_to_challenge)(struct rxrpc_connection *conn, |
| 308 | struct sk_buff *challenge); |
| 309 | |
| 310 | /* verify a response */ |
| 311 | int (*verify_response)(struct rxrpc_connection *, |
| 312 | struct sk_buff *); |
| 313 | |
| 314 | /* clear connection security */ |
| 315 | void (*clear)(struct rxrpc_connection *); |
| 316 | |
| 317 | /* Default ticket -> key decoder */ |
| 318 | int (*default_decode_ticket)(struct rxrpc_connection *conn, struct sk_buff *skb, |
| 319 | unsigned int ticket_offset, unsigned int ticket_len, |
| 320 | struct key **_key); |
| 321 | }; |
| 322 | |
| 323 | /* |
| 324 | * RxRPC local transport endpoint description |
| 325 | * - owned by a single AF_RXRPC socket |
| 326 | * - pointed to by transport socket struct sk_user_data |
| 327 | */ |
| 328 | struct rxrpc_local { |
| 329 | struct rcu_head rcu; |
| 330 | atomic_t active_users; /* Number of users of the local endpoint */ |
| 331 | refcount_t ref; /* Number of references to the structure */ |
| 332 | struct net *net; /* The network namespace */ |
| 333 | struct rxrpc_net *rxnet; /* Our bits in the network namespace */ |
| 334 | struct hlist_node link; |
| 335 | struct socket *socket; /* my UDP socket */ |
| 336 | struct task_struct *io_thread; |
| 337 | struct completion io_thread_ready; /* Indication that the I/O thread started */ |
| 338 | struct page_frag_cache tx_alloc; /* Tx control packet allocation (I/O thread only) */ |
| 339 | struct rxrpc_sock *service; /* Service(s) listening on this endpoint */ |
| 340 | #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY |
| 341 | struct sk_buff_head rx_delay_queue; /* Delay injection queue */ |
| 342 | #endif |
| 343 | struct sk_buff_head rx_queue; /* Received packets */ |
| 344 | struct list_head conn_attend_q; /* Conns requiring immediate attention */ |
| 345 | struct list_head call_attend_q; /* Calls requiring immediate attention */ |
| 346 | |
| 347 | struct rb_root client_bundles; /* Client connection bundles by socket params */ |
| 348 | spinlock_t client_bundles_lock; /* Lock for client_bundles */ |
| 349 | bool kill_all_client_conns; |
| 350 | struct list_head idle_client_conns; |
| 351 | struct timer_list client_conn_reap_timer; |
| 352 | unsigned long client_conn_flags; |
| 353 | #define RXRPC_CLIENT_CONN_REAP_TIMER 0 /* The client conn reap timer expired */ |
| 354 | |
| 355 | spinlock_t lock; /* access lock */ |
| 356 | rwlock_t services_lock; /* lock for services list */ |
| 357 | int debug_id; /* debug ID for printks */ |
| 358 | bool dead; |
| 359 | bool service_closed; /* Service socket closed */ |
| 360 | struct idr conn_ids; /* List of connection IDs */ |
| 361 | struct list_head new_client_calls; /* Newly created client calls need connection */ |
| 362 | spinlock_t client_call_lock; /* Lock for ->new_client_calls */ |
| 363 | struct sockaddr_rxrpc srx; /* local address */ |
| 364 | union { |
| 365 | /* Provide a kvec table sufficiently large to manage either a |
| 366 | * DATA packet with a maximum set of jumbo subpackets or a PING |
| 367 | * ACK padded out to 64K with zeropages for PMTUD. |
| 368 | */ |
| 369 | struct kvec kvec[1 + RXRPC_MAX_NR_JUMBO > 3 + 16 ? |
| 370 | 1 + RXRPC_MAX_NR_JUMBO : 3 + 16]; |
| 371 | struct bio_vec bvec[3 + 16]; |
| 372 | }; |
| 373 | }; |
| 374 | |
| 375 | /* |
| 376 | * RxRPC remote transport endpoint definition |
| 377 | * - matched by local endpoint, remote port, address and protocol type |
| 378 | */ |
| 379 | struct rxrpc_peer { |
| 380 | struct rcu_head rcu; /* This must be first */ |
| 381 | refcount_t ref; |
| 382 | unsigned long hash_key; |
| 383 | struct hlist_node hash_link; |
| 384 | struct rxrpc_local *local; |
| 385 | struct hlist_head error_targets; /* targets for net error distribution */ |
| 386 | struct rb_root service_conns; /* Service connections */ |
| 387 | struct list_head keepalive_link; /* Link in net->peer_keepalive[] */ |
| 388 | unsigned long app_data; /* Application data (e.g. afs_server) */ |
| 389 | time64_t last_tx_at; /* Last time packet sent here */ |
| 390 | seqlock_t service_conn_lock; |
| 391 | spinlock_t lock; /* access lock */ |
| 392 | int debug_id; /* debug ID for printks */ |
| 393 | struct sockaddr_rxrpc srx; /* remote address */ |
| 394 | |
| 395 | /* Path MTU discovery [RFC8899] */ |
| 396 | unsigned int pmtud_trial; /* Current MTU probe size */ |
| 397 | unsigned int pmtud_good; /* Largest working MTU probe we've tried */ |
| 398 | unsigned int pmtud_bad; /* Smallest non-working MTU probe we've tried */ |
| 399 | bool pmtud_lost; /* T if MTU probe was lost */ |
| 400 | bool pmtud_probing; /* T if we have an active probe outstanding */ |
| 401 | bool pmtud_pending; /* T if a call to this peer should send a probe */ |
| 402 | u8 pmtud_jumbo; /* Max jumbo packets for the MTU */ |
| 403 | bool ackr_adv_pmtud; /* T if the peer advertises path-MTU */ |
| 404 | unsigned int ackr_max_data; /* Maximum data advertised by peer */ |
| 405 | unsigned int if_mtu; /* Local interface MTU (- hdrsize) for this peer */ |
| 406 | unsigned int max_data; /* Maximum packet data capacity for this peer */ |
| 407 | unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */ |
| 408 | unsigned short tx_seg_max; /* Maximum number of transmissable segments */ |
| 409 | |
| 410 | /* Calculated RTT cache */ |
| 411 | unsigned int recent_srtt_us; |
| 412 | unsigned int recent_rto_us; |
| 413 | |
| 414 | u8 cong_ssthresh; /* Congestion slow-start threshold */ |
| 415 | }; |
| 416 | |
| 417 | /* |
| 418 | * Keys for matching a connection. |
| 419 | */ |
| 420 | struct rxrpc_conn_proto { |
| 421 | union { |
| 422 | struct { |
| 423 | u32 epoch; /* epoch of this connection */ |
| 424 | u32 cid; /* connection ID */ |
| 425 | }; |
| 426 | u64 index_key; |
| 427 | }; |
| 428 | }; |
| 429 | |
| 430 | struct rxrpc_conn_parameters { |
| 431 | struct rxrpc_local *local; /* Representation of local endpoint */ |
| 432 | struct rxrpc_peer *peer; /* Representation of remote endpoint */ |
| 433 | struct key *key; /* Security details */ |
| 434 | bool exclusive; /* T if conn is exclusive */ |
| 435 | bool upgrade; /* T if service ID can be upgraded */ |
| 436 | u16 service_id; /* Service ID for this connection */ |
| 437 | u32 security_level; /* Security level selected */ |
| 438 | }; |
| 439 | |
| 440 | /* |
| 441 | * Call completion condition (state == RXRPC_CALL_COMPLETE). |
| 442 | */ |
| 443 | enum rxrpc_call_completion { |
| 444 | RXRPC_CALL_SUCCEEDED, /* - Normal termination */ |
| 445 | RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */ |
| 446 | RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */ |
| 447 | RXRPC_CALL_LOCAL_ERROR, /* - call failed due to local error */ |
| 448 | RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */ |
| 449 | NR__RXRPC_CALL_COMPLETIONS |
| 450 | }; |
| 451 | |
| 452 | /* |
| 453 | * Bits in the connection flags. |
| 454 | */ |
| 455 | enum rxrpc_conn_flag { |
| 456 | RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */ |
| 457 | RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */ |
| 458 | RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */ |
| 459 | RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */ |
| 460 | RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */ |
| 461 | RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */ |
| 462 | RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */ |
| 463 | }; |
| 464 | |
| 465 | #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \ |
| 466 | (1UL << RXRPC_CONN_FINAL_ACK_1) | \ |
| 467 | (1UL << RXRPC_CONN_FINAL_ACK_2) | \ |
| 468 | (1UL << RXRPC_CONN_FINAL_ACK_3)) |
| 469 | |
| 470 | /* |
| 471 | * Events that can be raised upon a connection. |
| 472 | */ |
| 473 | enum rxrpc_conn_event { |
| 474 | RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */ |
| 475 | RXRPC_CONN_EV_ABORT_CALLS, /* Abort attached calls */ |
| 476 | }; |
| 477 | |
| 478 | /* |
| 479 | * The connection protocol state. |
| 480 | */ |
| 481 | enum rxrpc_conn_proto_state { |
| 482 | RXRPC_CONN_UNUSED, /* Connection not yet attempted */ |
| 483 | RXRPC_CONN_CLIENT_UNSECURED, /* Client connection needs security init */ |
| 484 | RXRPC_CONN_CLIENT, /* Client connection */ |
| 485 | RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */ |
| 486 | RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */ |
| 487 | RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */ |
| 488 | RXRPC_CONN_SERVICE, /* Service secured connection */ |
| 489 | RXRPC_CONN_ABORTED, /* Conn aborted */ |
| 490 | RXRPC_CONN__NR_STATES |
| 491 | }; |
| 492 | |
| 493 | /* |
| 494 | * RxRPC client connection bundle. |
| 495 | */ |
| 496 | struct rxrpc_bundle { |
| 497 | struct rxrpc_local *local; /* Representation of local endpoint */ |
| 498 | struct rxrpc_peer *peer; /* Remote endpoint */ |
| 499 | struct key *key; /* Security details */ |
| 500 | struct list_head proc_link; /* Link in net->bundle_proc_list */ |
| 501 | const struct rxrpc_security *security; /* applied security module */ |
| 502 | refcount_t ref; |
| 503 | atomic_t active; /* Number of active users */ |
| 504 | unsigned int debug_id; |
| 505 | u32 security_level; /* Security level selected */ |
| 506 | u16 service_id; /* Service ID for this connection */ |
| 507 | bool try_upgrade; /* True if the bundle is attempting upgrade */ |
| 508 | bool exclusive; /* T if conn is exclusive */ |
| 509 | bool upgrade; /* T if service ID can be upgraded */ |
| 510 | unsigned short alloc_error; /* Error from last conn allocation */ |
| 511 | struct rb_node local_node; /* Node in local->client_conns */ |
| 512 | struct list_head waiting_calls; /* Calls waiting for channels */ |
| 513 | unsigned long avail_chans; /* Mask of available channels */ |
| 514 | unsigned int conn_ids[4]; /* Connection IDs. */ |
| 515 | struct rxrpc_connection *conns[4]; /* The connections in the bundle (max 4) */ |
| 516 | }; |
| 517 | |
| 518 | /* |
| 519 | * RxRPC connection definition |
| 520 | * - matched by { local, peer, epoch, conn_id, direction } |
| 521 | * - each connection can only handle four simultaneous calls |
| 522 | */ |
| 523 | struct rxrpc_connection { |
| 524 | struct rxrpc_conn_proto proto; |
| 525 | struct rxrpc_local *local; /* Representation of local endpoint */ |
| 526 | struct rxrpc_peer *peer; /* Remote endpoint */ |
| 527 | struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ |
| 528 | struct key *key; /* Security details */ |
| 529 | struct list_head attend_link; /* Link in local->conn_attend_q */ |
| 530 | |
| 531 | refcount_t ref; |
| 532 | atomic_t active; /* Active count for service conns */ |
| 533 | struct rcu_head rcu; |
| 534 | struct list_head cache_link; |
| 535 | |
| 536 | unsigned char act_chans; /* Mask of active channels */ |
| 537 | struct rxrpc_channel { |
| 538 | unsigned long final_ack_at; /* Time at which to issue final ACK */ |
| 539 | struct rxrpc_call *call; /* Active call */ |
| 540 | unsigned int call_debug_id; /* call->debug_id */ |
| 541 | u32 call_id; /* ID of current call */ |
| 542 | u32 call_counter; /* Call ID counter */ |
| 543 | u32 last_call; /* ID of last call */ |
| 544 | u8 last_type; /* Type of last packet */ |
| 545 | union { |
| 546 | u32 last_seq; |
| 547 | u32 last_abort; |
| 548 | }; |
| 549 | } channels[RXRPC_MAXCALLS]; |
| 550 | |
| 551 | struct timer_list timer; /* Conn event timer */ |
| 552 | struct work_struct processor; /* connection event processor */ |
| 553 | struct work_struct destructor; /* In-process-context destroyer */ |
| 554 | struct rxrpc_bundle *bundle; /* Client connection bundle */ |
| 555 | struct rb_node service_node; /* Node in peer->service_conns */ |
| 556 | struct list_head proc_link; /* link in procfs list */ |
| 557 | struct list_head link; /* link in master connection list */ |
| 558 | struct sk_buff_head rx_queue; /* received conn-level packets */ |
| 559 | struct page_frag_cache tx_data_alloc; /* Tx DATA packet allocation */ |
| 560 | struct mutex tx_data_alloc_lock; |
| 561 | |
| 562 | struct mutex security_lock; /* Lock for security management */ |
| 563 | const struct rxrpc_security *security; /* applied security module */ |
| 564 | union { |
| 565 | struct { |
| 566 | struct crypto_sync_skcipher *cipher; /* encryption handle */ |
| 567 | struct rxrpc_crypt csum_iv; /* packet checksum base */ |
| 568 | u32 nonce; /* response re-use preventer */ |
| 569 | } rxkad; |
| 570 | struct { |
| 571 | struct rxgk_context *keys[4]; /* (Re-)keying buffer */ |
| 572 | u64 start_time; /* The start time for TK derivation */ |
| 573 | u8 nonce[20]; /* Response re-use preventer */ |
| 574 | u32 enctype; /* Kerberos 5 encoding type */ |
| 575 | u32 key_number; /* Current key number */ |
| 576 | } rxgk; |
| 577 | }; |
| 578 | rwlock_t security_use_lock; /* Security use/modification lock */ |
| 579 | struct sk_buff *tx_response; /* Response packet to be transmitted */ |
| 580 | |
| 581 | unsigned long flags; |
| 582 | unsigned long events; |
| 583 | unsigned long idle_timestamp; /* Time at which last became idle */ |
| 584 | spinlock_t state_lock; /* state-change lock */ |
| 585 | enum rxrpc_conn_proto_state state; /* current state of connection */ |
| 586 | enum rxrpc_call_completion completion; /* Completion condition */ |
| 587 | s32 abort_code; /* Abort code of connection abort */ |
| 588 | int debug_id; /* debug ID for printks */ |
| 589 | rxrpc_serial_t tx_serial; /* Outgoing packet serial number counter */ |
| 590 | unsigned int hi_serial; /* highest serial number received */ |
| 591 | rxrpc_serial_t pmtud_probe; /* Serial of MTU probe (or 0) */ |
| 592 | unsigned int pmtud_call; /* ID of call used for probe */ |
| 593 | u32 service_id; /* Service ID, possibly upgraded */ |
| 594 | u32 security_level; /* Security level selected */ |
| 595 | u8 security_ix; /* security type */ |
| 596 | u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */ |
| 597 | u8 bundle_shift; /* Index into bundle->avail_chans */ |
| 598 | bool exclusive; /* T if conn is exclusive */ |
| 599 | bool upgrade; /* T if service ID can be upgraded */ |
| 600 | u16 orig_service_id; /* Originally requested service ID */ |
| 601 | short error; /* Local error code */ |
| 602 | }; |
| 603 | |
| 604 | static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp) |
| 605 | { |
| 606 | return sp->hdr.flags & RXRPC_CLIENT_INITIATED; |
| 607 | } |
| 608 | |
| 609 | static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp) |
| 610 | { |
| 611 | return !rxrpc_to_server(sp); |
| 612 | } |
| 613 | |
| 614 | /* |
| 615 | * Flags in call->flags. |
| 616 | */ |
| 617 | enum rxrpc_call_flag { |
| 618 | RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */ |
| 619 | RXRPC_CALL_HAS_USERID, /* has a user ID attached */ |
| 620 | RXRPC_CALL_IS_SERVICE, /* Call is service call */ |
| 621 | RXRPC_CALL_EXPOSED, /* The call was exposed to the world */ |
| 622 | RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */ |
| 623 | RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */ |
| 624 | RXRPC_CALL_TX_ALL_ACKED, /* Last packet has been hard-acked */ |
| 625 | RXRPC_CALL_TX_NO_MORE, /* No more data to transmit (MSG_MORE deasserted) */ |
| 626 | RXRPC_CALL_SEND_PING, /* A ping will need to be sent */ |
| 627 | RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */ |
| 628 | RXRPC_CALL_BEGAN_RX_TIMER, /* We began the expect_rx_by timer */ |
| 629 | RXRPC_CALL_RX_HEARD, /* The peer responded at least once to this call */ |
| 630 | RXRPC_CALL_DISCONNECTED, /* The call has been disconnected */ |
| 631 | RXRPC_CALL_KERNEL, /* The call was made by the kernel */ |
| 632 | RXRPC_CALL_UPGRADE, /* Service upgrade was requested for the call */ |
| 633 | RXRPC_CALL_EXCLUSIVE, /* The call uses a once-only connection */ |
| 634 | RXRPC_CALL_RX_IS_IDLE, /* recvmsg() is idle - send an ACK */ |
| 635 | RXRPC_CALL_RECVMSG_READ_ALL, /* recvmsg() read all of the received data */ |
| 636 | RXRPC_CALL_CONN_CHALLENGING, /* The connection is being challenged */ |
| 637 | }; |
| 638 | |
| 639 | /* |
| 640 | * Events that can be raised on a call. |
| 641 | */ |
| 642 | enum rxrpc_call_event { |
| 643 | RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */ |
| 644 | RXRPC_CALL_EV_INITIAL_PING, /* Send initial ping for a new service call */ |
| 645 | }; |
| 646 | |
| 647 | /* |
| 648 | * The states that a call can be in. |
| 649 | */ |
| 650 | enum rxrpc_call_state { |
| 651 | RXRPC_CALL_UNINITIALISED, |
| 652 | RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */ |
| 653 | RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */ |
| 654 | RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */ |
| 655 | RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */ |
| 656 | RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */ |
| 657 | RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */ |
| 658 | RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */ |
| 659 | RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */ |
| 660 | RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */ |
| 661 | RXRPC_CALL_COMPLETE, /* - call complete */ |
| 662 | NR__RXRPC_CALL_STATES |
| 663 | }; |
| 664 | |
| 665 | /* |
| 666 | * Call Tx congestion management modes. |
| 667 | */ |
| 668 | enum rxrpc_ca_state { |
| 669 | RXRPC_CA_SLOW_START, |
| 670 | RXRPC_CA_CONGEST_AVOIDANCE, |
| 671 | RXRPC_CA_PACKET_LOSS, |
| 672 | RXRPC_CA_FAST_RETRANSMIT, |
| 673 | NR__RXRPC_CA_STATES |
| 674 | } __mode(byte); |
| 675 | |
| 676 | /* |
| 677 | * Current purpose of call RACK timer. According to the RACK-TLP protocol |
| 678 | * [RFC8985], the transmission timer (call->rack_timo_at) may only be used for |
| 679 | * one of these at once. |
| 680 | */ |
| 681 | enum rxrpc_rack_timer_mode { |
| 682 | RXRPC_CALL_RACKTIMER_OFF, /* Timer not running */ |
| 683 | RXRPC_CALL_RACKTIMER_RACK_REORDER, /* RACK reordering timer */ |
| 684 | RXRPC_CALL_RACKTIMER_TLP_PTO, /* TLP timeout */ |
| 685 | RXRPC_CALL_RACKTIMER_RTO, /* Retransmission timeout */ |
| 686 | } __mode(byte); |
| 687 | |
| 688 | /* |
| 689 | * RxRPC call definition |
| 690 | * - matched by { connection, call_id } |
| 691 | */ |
| 692 | struct rxrpc_call { |
| 693 | struct rcu_head rcu; |
| 694 | struct rxrpc_connection *conn; /* connection carrying call */ |
| 695 | struct rxrpc_bundle *bundle; /* Connection bundle to use */ |
| 696 | struct rxrpc_peer *peer; /* Peer record for remote address */ |
| 697 | struct rxrpc_local *local; /* Representation of local endpoint */ |
| 698 | struct rxrpc_sock __rcu *socket; /* socket responsible */ |
| 699 | struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ |
| 700 | struct key *key; /* Security details */ |
| 701 | const struct rxrpc_security *security; /* applied security module */ |
| 702 | struct mutex user_mutex; /* User access mutex */ |
| 703 | struct sockaddr_rxrpc dest_srx; /* Destination address */ |
| 704 | ktime_t delay_ack_at; /* When DELAY ACK needs to happen */ |
| 705 | ktime_t rack_timo_at; /* When ACK is figured as lost */ |
| 706 | ktime_t ping_at; /* When next to send a ping */ |
| 707 | ktime_t keepalive_at; /* When next to send a keepalive ping */ |
| 708 | ktime_t expect_rx_by; /* When we expect to get a packet by */ |
| 709 | ktime_t expect_req_by; /* When we expect to get a request DATA packet by */ |
| 710 | ktime_t expect_term_by; /* When we expect call termination by */ |
| 711 | u32 next_rx_timo; /* Timeout for next Rx packet (ms) */ |
| 712 | u32 next_req_timo; /* Timeout for next Rx request packet (ms) */ |
| 713 | u32 hard_timo; /* Maximum lifetime or 0 (s) */ |
| 714 | struct timer_list timer; /* Combined event timer */ |
| 715 | struct work_struct destroyer; /* In-process-context destroyer */ |
| 716 | rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */ |
| 717 | struct list_head link; /* link in master call list */ |
| 718 | struct list_head wait_link; /* Link in local->new_client_calls */ |
| 719 | struct hlist_node error_link; /* link in error distribution list */ |
| 720 | struct list_head accept_link; /* Link in rx->acceptq */ |
| 721 | struct list_head recvmsg_link; /* Link in rx->recvmsg_q */ |
| 722 | struct list_head sock_link; /* Link in rx->sock_calls */ |
| 723 | struct rb_node sock_node; /* Node in rx->calls */ |
| 724 | struct list_head attend_link; /* Link in local->call_attend_q */ |
| 725 | struct rxrpc_txbuf *tx_pending; /* Tx buffer being filled */ |
| 726 | wait_queue_head_t waitq; /* Wait queue for channel or Tx */ |
| 727 | s64 tx_total_len; /* Total length left to be transmitted (or -1) */ |
| 728 | unsigned long user_call_ID; /* user-defined call ID */ |
| 729 | unsigned long flags; |
| 730 | unsigned long events; |
| 731 | spinlock_t notify_lock; /* Kernel notification lock */ |
| 732 | unsigned int send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */ |
| 733 | s32 send_abort; /* Abort code to be sent */ |
| 734 | short send_abort_err; /* Error to be associated with the abort */ |
| 735 | rxrpc_seq_t send_abort_seq; /* DATA packet that incurred the abort (or 0) */ |
| 736 | s32 abort_code; /* Local/remote abort code */ |
| 737 | int error; /* Local error incurred */ |
| 738 | enum rxrpc_call_state _state; /* Current state of call (needs barrier) */ |
| 739 | enum rxrpc_call_completion completion; /* Call completion condition */ |
| 740 | refcount_t ref; |
| 741 | u8 security_ix; /* Security type */ |
| 742 | enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */ |
| 743 | u32 call_id; /* call ID on connection */ |
| 744 | u32 cid; /* connection ID plus channel index */ |
| 745 | u32 security_level; /* Security level selected */ |
| 746 | u32 security_enctype; /* Security-specific encoding type (or 0) */ |
| 747 | int debug_id; /* debug ID for printks */ |
| 748 | unsigned short rx_pkt_offset; /* Current recvmsg packet offset */ |
| 749 | unsigned short rx_pkt_len; /* Current recvmsg packet len */ |
| 750 | |
| 751 | /* Sendmsg data tracking. */ |
| 752 | rxrpc_seq_t send_top; /* Highest Tx slot filled by sendmsg. */ |
| 753 | struct rxrpc_txqueue *send_queue; /* Queue that sendmsg is writing into */ |
| 754 | |
| 755 | /* Transmitted data tracking. */ |
| 756 | struct rxrpc_txqueue *tx_queue; /* Start of transmission buffers */ |
| 757 | struct rxrpc_txqueue *tx_qtail; /* End of transmission buffers */ |
| 758 | rxrpc_seq_t tx_qbase; /* First slot in tx_queue */ |
| 759 | rxrpc_seq_t tx_bottom; /* First packet in buffer */ |
| 760 | rxrpc_seq_t tx_transmitted; /* Highest packet transmitted */ |
| 761 | rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */ |
| 762 | rxrpc_serial_t tx_last_serial; /* Serial of last DATA transmitted */ |
| 763 | u16 tx_backoff; /* Delay to insert due to Tx failure (ms) */ |
| 764 | u16 tx_nr_sent; /* Number of packets sent, but unacked */ |
| 765 | u16 tx_nr_lost; /* Number of packets marked lost */ |
| 766 | u16 tx_nr_resent; /* Number of packets resent, but unacked */ |
| 767 | u16 tx_winsize; /* Maximum size of Tx window */ |
| 768 | #define RXRPC_TX_MAX_WINDOW 128 |
| 769 | u8 tx_jumbo_max; /* Maximum subpkts peer will accept */ |
| 770 | ktime_t tx_last_sent; /* Last time a transmission occurred */ |
| 771 | |
| 772 | /* Received data tracking */ |
| 773 | struct sk_buff_head recvmsg_queue; /* Queue of packets ready for recvmsg() */ |
| 774 | struct sk_buff_head rx_queue; /* Queue of packets for this call to receive */ |
| 775 | struct sk_buff_head rx_oos_queue; /* Queue of out of sequence packets */ |
| 776 | |
| 777 | rxrpc_seq_t rx_highest_seq; /* Higest sequence number received */ |
| 778 | rxrpc_seq_t rx_consumed; /* Highest packet consumed */ |
| 779 | rxrpc_serial_t rx_serial; /* Highest serial received for this call */ |
| 780 | u8 rx_winsize; /* Size of Rx window */ |
| 781 | |
| 782 | /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS |
| 783 | * is fixed, we keep these numbers in terms of segments (ie. DATA |
| 784 | * packets) rather than bytes. |
| 785 | */ |
| 786 | #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN |
| 787 | #define RXRPC_MIN_CWND 4 |
| 788 | enum rxrpc_ca_state cong_ca_state; /* Congestion control state */ |
| 789 | u8 cong_extra; /* Extra to send for congestion management */ |
| 790 | u16 cong_cwnd; /* Congestion window size */ |
| 791 | u16 cong_ssthresh; /* Slow-start threshold */ |
| 792 | u16 cong_dup_acks; /* Count of ACKs showing missing packets */ |
| 793 | u16 cong_cumul_acks; /* Cumulative ACK count */ |
| 794 | ktime_t cong_tstamp; /* Last time cwnd was changed */ |
| 795 | |
| 796 | /* RACK-TLP [RFC8985] state. */ |
| 797 | ktime_t rack_xmit_ts; /* Latest transmission timestamp */ |
| 798 | ktime_t rack_rtt; /* RTT of most recently ACK'd segment */ |
| 799 | ktime_t rack_rtt_ts; /* Timestamp of rack_rtt */ |
| 800 | ktime_t rack_reo_wnd; /* Reordering window */ |
| 801 | unsigned int rack_reo_wnd_mult; /* Multiplier applied to rack_reo_wnd */ |
| 802 | int rack_reo_wnd_persist; /* Num loss recoveries before reset reo_wnd */ |
| 803 | rxrpc_seq_t rack_fack; /* Highest sequence so far ACK'd */ |
| 804 | rxrpc_seq_t rack_end_seq; /* Highest sequence seen */ |
| 805 | rxrpc_seq_t rack_dsack_round; /* DSACK opt recv'd in latest roundtrip */ |
| 806 | bool rack_dsack_round_none; /* T if dsack_round is "None" */ |
| 807 | bool rack_reordering_seen; /* T if detected reordering event */ |
| 808 | enum rxrpc_rack_timer_mode rack_timer_mode; /* Current mode of RACK timer */ |
| 809 | bool tlp_is_retrans; /* T if unacked TLP retransmission */ |
| 810 | rxrpc_serial_t tlp_serial; /* Serial of TLP probe (or 0 if none in progress) */ |
| 811 | rxrpc_seq_t tlp_seq; /* Sequence of TLP probe */ |
| 812 | unsigned int tlp_rtt_taken; /* Last time RTT taken */ |
| 813 | ktime_t tlp_max_ack_delay; /* Sender budget for max delayed ACK interval */ |
| 814 | |
| 815 | /* Receive-phase ACK management (ACKs we send). */ |
| 816 | u8 ackr_reason; /* reason to ACK */ |
| 817 | u16 ackr_sack_base; /* Starting slot in SACK table ring */ |
| 818 | rxrpc_seq_t ackr_window; /* Base of SACK window */ |
| 819 | rxrpc_seq_t ackr_wtop; /* Base of SACK window */ |
| 820 | unsigned int ackr_nr_unacked; /* Number of unacked packets */ |
| 821 | atomic_t ackr_nr_consumed; /* Number of packets needing hard ACK */ |
| 822 | struct { |
| 823 | #define RXRPC_SACK_SIZE 256 |
| 824 | /* SACK table for soft-acked packets */ |
| 825 | u8 ackr_sack_table[RXRPC_SACK_SIZE]; |
| 826 | } __aligned(8); |
| 827 | |
| 828 | /* RTT management */ |
| 829 | rxrpc_serial_t rtt_serial[4]; /* Serial number of DATA or PING sent */ |
| 830 | ktime_t rtt_sent_at[4]; /* Time packet sent */ |
| 831 | unsigned long rtt_avail; /* Mask of available slots in bits 0-3, |
| 832 | * Mask of pending samples in 8-11 */ |
| 833 | #define RXRPC_CALL_RTT_AVAIL_MASK 0xf |
| 834 | #define RXRPC_CALL_RTT_PEND_SHIFT 8 |
| 835 | |
| 836 | /* Transmission-phase ACK management (ACKs we've received). */ |
| 837 | ktime_t acks_latest_ts; /* Timestamp of latest ACK received */ |
| 838 | rxrpc_seq_t acks_hard_ack; /* Highest sequence hard acked */ |
| 839 | rxrpc_seq_t acks_prev_seq; /* Highest previousPacket received */ |
| 840 | rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */ |
| 841 | rxrpc_serial_t acks_highest_serial; /* Highest serial number ACK'd */ |
| 842 | unsigned short acks_nr_sacks; /* Number of soft acks recorded */ |
| 843 | unsigned short acks_nr_snacks; /* Number of soft nacks recorded */ |
| 844 | |
| 845 | /* Calculated RTT cache */ |
| 846 | ktime_t rtt_last_req; /* Time of last RTT request */ |
| 847 | unsigned int rtt_count; /* Number of samples we've got */ |
| 848 | unsigned int rtt_taken; /* Number of samples taken (wrapping) */ |
| 849 | struct minmax min_rtt; /* Estimated minimum RTT */ |
| 850 | u32 srtt_us; /* smoothed round trip time << 3 in usecs */ |
| 851 | u32 mdev_us; /* medium deviation */ |
| 852 | u32 mdev_max_us; /* maximal mdev for the last rtt period */ |
| 853 | u32 rttvar_us; /* smoothed mdev_max */ |
| 854 | u32 rto_us; /* Retransmission timeout in usec */ |
| 855 | u8 backoff; /* Backoff timeout (as shift) */ |
| 856 | }; |
| 857 | |
| 858 | /* |
| 859 | * Summary of a new ACK and the changes it made to the Tx buffer packet states. |
| 860 | */ |
| 861 | struct rxrpc_ack_summary { |
| 862 | rxrpc_serial_t ack_serial; /* Serial number of ACK */ |
| 863 | rxrpc_serial_t acked_serial; /* Serial number ACK'd */ |
| 864 | u16 in_flight; /* Number of unreceived transmissions */ |
| 865 | u16 nr_new_hacks; /* Number of rotated new ACKs */ |
| 866 | u16 nr_new_sacks; /* Number of new soft ACKs in packet */ |
| 867 | u16 nr_new_snacks; /* Number of new soft nacks in packet */ |
| 868 | u8 ack_reason; |
| 869 | bool new_low_snack:1; /* T if new low soft NACK found */ |
| 870 | bool retrans_timeo:1; /* T if reTx due to timeout happened */ |
| 871 | bool need_retransmit:1; /* T if we need transmission */ |
| 872 | bool rtt_sample_avail:1; /* T if RTT sample available */ |
| 873 | bool in_fast_or_rto_recovery:1; |
| 874 | bool exiting_fast_or_rto_recovery:1; |
| 875 | bool tlp_probe_acked:1; /* T if the TLP probe seq was acked */ |
| 876 | u8 /*enum rxrpc_congest_change*/ change; |
| 877 | }; |
| 878 | |
| 879 | /* |
| 880 | * sendmsg() cmsg-specified parameters. |
| 881 | */ |
| 882 | enum rxrpc_command { |
| 883 | RXRPC_CMD_SEND_DATA, /* send data message */ |
| 884 | RXRPC_CMD_SEND_ABORT, /* request abort generation */ |
| 885 | RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */ |
| 886 | RXRPC_CMD_CHARGE_ACCEPT, /* [server] charge accept preallocation */ |
| 887 | }; |
| 888 | |
| 889 | struct rxrpc_call_params { |
| 890 | s64 tx_total_len; /* Total Tx data length (if send data) */ |
| 891 | unsigned long user_call_ID; /* User's call ID */ |
| 892 | struct { |
| 893 | u32 hard; /* Maximum lifetime (sec) */ |
| 894 | u32 idle; /* Max time since last data packet (msec) */ |
| 895 | u32 normal; /* Max time since last call packet (msec) */ |
| 896 | } timeouts; |
| 897 | u8 nr_timeouts; /* Number of timeouts specified */ |
| 898 | bool kernel; /* T if kernel is making the call */ |
| 899 | enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */ |
| 900 | }; |
| 901 | |
| 902 | struct rxrpc_send_params { |
| 903 | struct rxrpc_call_params call; |
| 904 | u32 abort_code; /* Abort code to Tx (if abort) */ |
| 905 | enum rxrpc_command command : 8; /* The command to implement */ |
| 906 | bool exclusive; /* Shared or exclusive call */ |
| 907 | bool upgrade; /* If the connection is upgradeable */ |
| 908 | }; |
| 909 | |
| 910 | /* |
| 911 | * Buffer of data to be output as a packet. |
| 912 | */ |
| 913 | struct rxrpc_txbuf { |
| 914 | refcount_t ref; |
| 915 | rxrpc_seq_t seq; /* Sequence number of this packet */ |
| 916 | rxrpc_serial_t serial; /* Last serial number transmitted with */ |
| 917 | unsigned int call_debug_id; |
| 918 | unsigned int debug_id; |
| 919 | unsigned short len; /* Amount of data in buffer */ |
| 920 | unsigned short space; /* Remaining data space */ |
| 921 | unsigned short offset; /* Offset of fill point */ |
| 922 | unsigned short crypto_header; /* Size of crypto header */ |
| 923 | unsigned short sec_header; /* Size of security header */ |
| 924 | unsigned short pkt_len; /* Size of packet content */ |
| 925 | unsigned short alloc_size; /* Amount of bufferage allocated */ |
| 926 | unsigned int flags; |
| 927 | #define RXRPC_TXBUF_WIRE_FLAGS 0xff /* The wire protocol flags */ |
| 928 | #define RXRPC_TXBUF_RESENT 0x100 /* Set if has been resent */ |
| 929 | __be16 cksum; /* Checksum to go in header */ |
| 930 | bool jumboable; /* Can be non-terminal jumbo subpacket */ |
| 931 | void *data; /* Data with preceding jumbo header */ |
| 932 | }; |
| 933 | |
| 934 | static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb) |
| 935 | { |
| 936 | return txb->flags & RXRPC_CLIENT_INITIATED; |
| 937 | } |
| 938 | |
| 939 | static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb) |
| 940 | { |
| 941 | return !rxrpc_sending_to_server(txb); |
| 942 | } |
| 943 | |
| 944 | /* |
| 945 | * Transmit queue element, including RACK [RFC8985] per-segment metadata. The |
| 946 | * transmission timestamp is in usec from the base. |
| 947 | */ |
| 948 | struct rxrpc_txqueue { |
| 949 | /* Start with the members we want to prefetch. */ |
| 950 | struct rxrpc_txqueue *next; |
| 951 | ktime_t xmit_ts_base; |
| 952 | rxrpc_seq_t qbase; |
| 953 | u8 nr_reported_acks; /* Number of segments explicitly acked/nacked */ |
| 954 | unsigned long segment_acked; /* Bit-per-buf: Set if ACK'd */ |
| 955 | unsigned long segment_lost; /* Bit-per-buf: Set if declared lost */ |
| 956 | unsigned long segment_retransmitted; /* Bit-per-buf: Set if retransmitted */ |
| 957 | unsigned long rtt_samples; /* Bit-per-buf: Set if available for RTT */ |
| 958 | unsigned long ever_retransmitted; /* Bit-per-buf: Set if ever retransmitted */ |
| 959 | |
| 960 | /* The arrays we want to pack into as few cache lines as possible. */ |
| 961 | struct { |
| 962 | #define RXRPC_NR_TXQUEUE BITS_PER_LONG |
| 963 | #define RXRPC_TXQ_MASK (RXRPC_NR_TXQUEUE - 1) |
| 964 | struct rxrpc_txbuf *bufs[RXRPC_NR_TXQUEUE]; |
| 965 | unsigned int segment_serial[RXRPC_NR_TXQUEUE]; |
| 966 | unsigned int segment_xmit_ts[RXRPC_NR_TXQUEUE]; |
| 967 | } ____cacheline_aligned; |
| 968 | }; |
| 969 | |
| 970 | /* |
| 971 | * Data transmission request. |
| 972 | */ |
| 973 | struct rxrpc_send_data_req { |
| 974 | ktime_t now; /* Current time */ |
| 975 | struct rxrpc_txqueue *tq; /* Tx queue segment holding first DATA */ |
| 976 | rxrpc_seq_t seq; /* Sequence of first data */ |
| 977 | int n; /* Number of DATA packets to glue into jumbo */ |
| 978 | bool retrans; /* T if this is a retransmission */ |
| 979 | bool did_send; /* T if did actually send */ |
| 980 | bool tlp_probe; /* T if this is a TLP probe */ |
| 981 | int /* enum rxrpc_txdata_trace */ trace; |
| 982 | }; |
| 983 | |
| 984 | #include <trace/events/rxrpc.h> |
| 985 | |
| 986 | /* |
| 987 | * Allocate the next serial number on a connection. 0 must be skipped. |
| 988 | */ |
| 989 | static inline rxrpc_serial_t rxrpc_get_next_serial(struct rxrpc_connection *conn) |
| 990 | { |
| 991 | rxrpc_serial_t serial; |
| 992 | |
| 993 | serial = conn->tx_serial; |
| 994 | if (serial == 0) |
| 995 | serial = 1; |
| 996 | conn->tx_serial = serial + 1; |
| 997 | return serial; |
| 998 | } |
| 999 | |
| 1000 | /* |
| 1001 | * Allocate the next serial n numbers on a connection. 0 must be skipped. |
| 1002 | */ |
| 1003 | static inline rxrpc_serial_t rxrpc_get_next_serials(struct rxrpc_connection *conn, |
| 1004 | unsigned int n) |
| 1005 | { |
| 1006 | rxrpc_serial_t serial; |
| 1007 | |
| 1008 | serial = conn->tx_serial; |
| 1009 | if (serial + n <= n) |
| 1010 | serial = 1; |
| 1011 | conn->tx_serial = serial + n; |
| 1012 | return serial; |
| 1013 | } |
| 1014 | |
| 1015 | /* |
| 1016 | * af_rxrpc.c |
| 1017 | */ |
| 1018 | extern atomic_t rxrpc_n_rx_skbs; |
| 1019 | extern struct workqueue_struct *rxrpc_workqueue; |
| 1020 | |
| 1021 | /* |
| 1022 | * call_accept.c |
| 1023 | */ |
| 1024 | int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t); |
| 1025 | void rxrpc_discard_prealloc(struct rxrpc_sock *); |
| 1026 | bool rxrpc_new_incoming_call(struct rxrpc_local *local, |
| 1027 | struct rxrpc_peer *peer, |
| 1028 | struct rxrpc_connection *conn, |
| 1029 | struct sockaddr_rxrpc *peer_srx, |
| 1030 | struct sk_buff *skb); |
| 1031 | int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long); |
| 1032 | |
| 1033 | /* |
| 1034 | * call_event.c |
| 1035 | */ |
| 1036 | void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial, |
| 1037 | enum rxrpc_propose_ack_trace why); |
| 1038 | void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t, |
| 1039 | enum rxrpc_propose_ack_trace); |
| 1040 | void rxrpc_resend_tlp(struct rxrpc_call *call); |
| 1041 | void rxrpc_transmit_some_data(struct rxrpc_call *call, unsigned int limit, |
| 1042 | enum rxrpc_txdata_trace trace); |
| 1043 | bool rxrpc_input_call_event(struct rxrpc_call *call); |
| 1044 | |
| 1045 | /* |
| 1046 | * call_object.c |
| 1047 | */ |
| 1048 | extern const char *const rxrpc_call_states[]; |
| 1049 | extern const char *const rxrpc_call_completions[]; |
| 1050 | extern struct kmem_cache *rxrpc_call_jar; |
| 1051 | |
| 1052 | void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what); |
| 1053 | struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long); |
| 1054 | struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int); |
| 1055 | struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *, |
| 1056 | struct rxrpc_conn_parameters *, |
| 1057 | struct rxrpc_call_params *, gfp_t, |
| 1058 | unsigned int) |
| 1059 | __releases(&rx->sk.sk_lock) |
| 1060 | __acquires(&call->user_mutex); |
| 1061 | void rxrpc_start_call_timer(struct rxrpc_call *call); |
| 1062 | void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *, |
| 1063 | struct sk_buff *); |
| 1064 | void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *); |
| 1065 | void rxrpc_release_calls_on_socket(struct rxrpc_sock *); |
| 1066 | void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace); |
| 1067 | struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace); |
| 1068 | void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace); |
| 1069 | void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace); |
| 1070 | void rxrpc_cleanup_call(struct rxrpc_call *); |
| 1071 | void rxrpc_destroy_all_calls(struct rxrpc_net *); |
| 1072 | |
| 1073 | static inline bool rxrpc_is_service_call(const struct rxrpc_call *call) |
| 1074 | { |
| 1075 | return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags); |
| 1076 | } |
| 1077 | |
| 1078 | static inline bool rxrpc_is_client_call(const struct rxrpc_call *call) |
| 1079 | { |
| 1080 | return !rxrpc_is_service_call(call); |
| 1081 | } |
| 1082 | |
| 1083 | /* |
| 1084 | * call_state.c |
| 1085 | */ |
| 1086 | bool rxrpc_set_call_completion(struct rxrpc_call *call, |
| 1087 | enum rxrpc_call_completion compl, |
| 1088 | u32 abort_code, |
| 1089 | int error); |
| 1090 | bool rxrpc_call_completed(struct rxrpc_call *call); |
| 1091 | bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq, |
| 1092 | u32 abort_code, int error, enum rxrpc_abort_reason why); |
| 1093 | void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl, |
| 1094 | int error); |
| 1095 | |
| 1096 | static inline void rxrpc_set_call_state(struct rxrpc_call *call, |
| 1097 | enum rxrpc_call_state state) |
| 1098 | { |
| 1099 | /* Order write of completion info before write of ->state. */ |
| 1100 | smp_store_release(&call->_state, state); |
| 1101 | wake_up(&call->waitq); |
| 1102 | } |
| 1103 | |
| 1104 | static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call) |
| 1105 | { |
| 1106 | return call->_state; /* Only inside I/O thread */ |
| 1107 | } |
| 1108 | |
| 1109 | static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call) |
| 1110 | { |
| 1111 | return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; |
| 1112 | } |
| 1113 | |
| 1114 | static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call) |
| 1115 | { |
| 1116 | /* Order read ->state before read of completion info. */ |
| 1117 | return smp_load_acquire(&call->_state); |
| 1118 | } |
| 1119 | |
| 1120 | static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call) |
| 1121 | { |
| 1122 | return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE; |
| 1123 | } |
| 1124 | |
| 1125 | static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call) |
| 1126 | { |
| 1127 | return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED; |
| 1128 | } |
| 1129 | |
| 1130 | /* |
| 1131 | * conn_client.c |
| 1132 | */ |
| 1133 | extern unsigned int rxrpc_reap_client_connections; |
| 1134 | extern unsigned long rxrpc_conn_idle_client_expiry; |
| 1135 | extern unsigned long rxrpc_conn_idle_client_fast_expiry; |
| 1136 | |
| 1137 | void rxrpc_purge_client_connections(struct rxrpc_local *local); |
| 1138 | struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); |
| 1139 | void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace); |
| 1140 | int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp); |
| 1141 | void rxrpc_connect_client_calls(struct rxrpc_local *local); |
| 1142 | void rxrpc_expose_client_call(struct rxrpc_call *); |
| 1143 | void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *); |
| 1144 | void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle); |
| 1145 | void rxrpc_discard_expired_client_conns(struct rxrpc_local *local); |
| 1146 | void rxrpc_clean_up_local_conns(struct rxrpc_local *); |
| 1147 | |
| 1148 | /* |
| 1149 | * conn_event.c |
| 1150 | */ |
| 1151 | void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb, |
| 1152 | unsigned int channel); |
| 1153 | int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb, |
| 1154 | s32 abort_code, int err, enum rxrpc_abort_reason why); |
| 1155 | void rxrpc_process_connection(struct work_struct *); |
| 1156 | void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool); |
| 1157 | bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb); |
| 1158 | void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb); |
| 1159 | |
| 1160 | static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn) |
| 1161 | { |
| 1162 | /* Order reading the abort info after the state check. */ |
| 1163 | return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED; |
| 1164 | } |
| 1165 | |
| 1166 | /* |
| 1167 | * conn_object.c |
| 1168 | */ |
| 1169 | extern unsigned int rxrpc_connection_expiry; |
| 1170 | extern unsigned int rxrpc_closed_conn_expiry; |
| 1171 | |
| 1172 | void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why); |
| 1173 | struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t); |
| 1174 | struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *, |
| 1175 | struct sockaddr_rxrpc *, |
| 1176 | struct sk_buff *); |
| 1177 | void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *); |
| 1178 | void rxrpc_disconnect_call(struct rxrpc_call *); |
| 1179 | void rxrpc_kill_client_conn(struct rxrpc_connection *); |
| 1180 | void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace); |
| 1181 | void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); |
| 1182 | struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *, |
| 1183 | enum rxrpc_conn_trace); |
| 1184 | struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *, |
| 1185 | enum rxrpc_conn_trace); |
| 1186 | void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace); |
| 1187 | void rxrpc_service_connection_reaper(struct work_struct *); |
| 1188 | void rxrpc_destroy_all_connections(struct rxrpc_net *); |
| 1189 | |
| 1190 | static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn) |
| 1191 | { |
| 1192 | return conn->out_clientflag; |
| 1193 | } |
| 1194 | |
| 1195 | static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn) |
| 1196 | { |
| 1197 | return !rxrpc_conn_is_client(conn); |
| 1198 | } |
| 1199 | |
| 1200 | static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn, |
| 1201 | unsigned long expire_at) |
| 1202 | { |
| 1203 | timer_reduce(&conn->timer, expire_at); |
| 1204 | } |
| 1205 | |
| 1206 | /* |
| 1207 | * conn_service.c |
| 1208 | */ |
| 1209 | struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *, |
| 1210 | struct sk_buff *); |
| 1211 | struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t); |
| 1212 | void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *, |
| 1213 | const struct rxrpc_security *, struct sk_buff *); |
| 1214 | void rxrpc_unpublish_service_conn(struct rxrpc_connection *); |
| 1215 | |
| 1216 | /* |
| 1217 | * input.c |
| 1218 | */ |
| 1219 | void rxrpc_congestion_degrade(struct rxrpc_call *); |
| 1220 | void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *); |
| 1221 | void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *); |
| 1222 | |
| 1223 | /* |
| 1224 | * input_rack.c |
| 1225 | */ |
| 1226 | void rxrpc_input_rack_one(struct rxrpc_call *call, |
| 1227 | struct rxrpc_ack_summary *summary, |
| 1228 | struct rxrpc_txqueue *tq, |
| 1229 | unsigned int ix); |
| 1230 | void rxrpc_input_rack(struct rxrpc_call *call, |
| 1231 | struct rxrpc_ack_summary *summary, |
| 1232 | struct rxrpc_txqueue *tq, |
| 1233 | unsigned long new_acks); |
| 1234 | void rxrpc_rack_detect_loss_and_arm_timer(struct rxrpc_call *call, |
| 1235 | struct rxrpc_ack_summary *summary); |
| 1236 | ktime_t rxrpc_tlp_calc_pto(struct rxrpc_call *call, ktime_t now); |
| 1237 | void rxrpc_tlp_send_probe(struct rxrpc_call *call); |
| 1238 | void rxrpc_tlp_process_ack(struct rxrpc_call *call, struct rxrpc_ack_summary *summary); |
| 1239 | void rxrpc_rack_timer_expired(struct rxrpc_call *call, ktime_t overran_by); |
| 1240 | |
| 1241 | /* Initialise TLP state [RFC8958 7.1]. */ |
| 1242 | static inline void rxrpc_tlp_init(struct rxrpc_call *call) |
| 1243 | { |
| 1244 | call->tlp_serial = 0; |
| 1245 | call->tlp_seq = call->acks_hard_ack; |
| 1246 | call->tlp_is_retrans = false; |
| 1247 | } |
| 1248 | |
| 1249 | /* |
| 1250 | * io_thread.c |
| 1251 | */ |
| 1252 | int rxrpc_encap_rcv(struct sock *, struct sk_buff *); |
| 1253 | void rxrpc_error_report(struct sock *); |
| 1254 | bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why, |
| 1255 | s32 abort_code, int err); |
| 1256 | int rxrpc_io_thread(void *data); |
| 1257 | void rxrpc_post_response(struct rxrpc_connection *conn, struct sk_buff *skb); |
| 1258 | static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local) |
| 1259 | { |
| 1260 | if (!local->io_thread) |
| 1261 | return; |
| 1262 | wake_up_process(READ_ONCE(local->io_thread)); |
| 1263 | } |
| 1264 | |
| 1265 | static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why) |
| 1266 | { |
| 1267 | return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO); |
| 1268 | } |
| 1269 | |
| 1270 | /* |
| 1271 | * insecure.c |
| 1272 | */ |
| 1273 | extern const struct rxrpc_security rxrpc_no_security; |
| 1274 | |
| 1275 | /* |
| 1276 | * key.c |
| 1277 | */ |
| 1278 | extern struct key_type key_type_rxrpc; |
| 1279 | |
| 1280 | int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int); |
| 1281 | int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t, |
| 1282 | u32); |
| 1283 | |
| 1284 | /* |
| 1285 | * local_event.c |
| 1286 | */ |
| 1287 | void rxrpc_gen_version_string(void); |
| 1288 | void rxrpc_send_version_request(struct rxrpc_local *local, |
| 1289 | struct rxrpc_host_header *hdr, |
| 1290 | struct sk_buff *skb); |
| 1291 | |
| 1292 | /* |
| 1293 | * local_object.c |
| 1294 | */ |
| 1295 | void rxrpc_local_dont_fragment(const struct rxrpc_local *local, bool set); |
| 1296 | struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *); |
| 1297 | struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace); |
| 1298 | struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace); |
| 1299 | void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace); |
| 1300 | struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace); |
| 1301 | void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace); |
| 1302 | void rxrpc_destroy_local(struct rxrpc_local *local); |
| 1303 | void rxrpc_destroy_all_locals(struct rxrpc_net *); |
| 1304 | |
| 1305 | static inline bool __rxrpc_use_local(struct rxrpc_local *local, |
| 1306 | enum rxrpc_local_trace why) |
| 1307 | { |
| 1308 | int r, u; |
| 1309 | |
| 1310 | r = refcount_read(&local->ref); |
| 1311 | u = atomic_fetch_add_unless(&local->active_users, 1, 0); |
| 1312 | trace_rxrpc_local(local->debug_id, why, r, u); |
| 1313 | return u != 0; |
| 1314 | } |
| 1315 | |
| 1316 | static inline void rxrpc_see_local(struct rxrpc_local *local, |
| 1317 | enum rxrpc_local_trace why) |
| 1318 | { |
| 1319 | int r, u; |
| 1320 | |
| 1321 | r = refcount_read(&local->ref); |
| 1322 | u = atomic_read(&local->active_users); |
| 1323 | trace_rxrpc_local(local->debug_id, why, r, u); |
| 1324 | } |
| 1325 | |
| 1326 | /* |
| 1327 | * misc.c |
| 1328 | */ |
| 1329 | extern unsigned int rxrpc_max_backlog __read_mostly; |
| 1330 | extern unsigned long rxrpc_soft_ack_delay; |
| 1331 | extern unsigned long rxrpc_idle_ack_delay; |
| 1332 | extern unsigned int rxrpc_rx_window_size; |
| 1333 | extern unsigned int rxrpc_rx_mtu; |
| 1334 | extern unsigned int rxrpc_rx_jumbo_max; |
| 1335 | #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY |
| 1336 | extern unsigned long rxrpc_inject_rx_delay; |
| 1337 | #endif |
| 1338 | |
| 1339 | /* |
| 1340 | * net_ns.c |
| 1341 | */ |
| 1342 | extern unsigned int rxrpc_net_id; |
| 1343 | extern struct pernet_operations rxrpc_net_ops; |
| 1344 | |
| 1345 | static inline struct rxrpc_net *rxrpc_net(struct net *net) |
| 1346 | { |
| 1347 | return net_generic(net, rxrpc_net_id); |
| 1348 | } |
| 1349 | |
| 1350 | /* |
| 1351 | * out_of_band.c |
| 1352 | */ |
| 1353 | void rxrpc_notify_socket_oob(struct rxrpc_call *call, struct sk_buff *skb); |
| 1354 | void rxrpc_add_pending_oob(struct rxrpc_sock *rx, struct sk_buff *skb); |
| 1355 | int rxrpc_sendmsg_oob(struct rxrpc_sock *rx, struct msghdr *msg, size_t len); |
| 1356 | |
| 1357 | /* |
| 1358 | * output.c |
| 1359 | */ |
| 1360 | ssize_t do_udp_sendmsg(struct socket *socket, struct msghdr *msg, size_t len); |
| 1361 | void rxrpc_send_ACK(struct rxrpc_call *call, u8 ack_reason, |
| 1362 | rxrpc_serial_t serial, enum rxrpc_propose_ack_trace why); |
| 1363 | void rxrpc_send_probe_for_pmtud(struct rxrpc_call *call); |
| 1364 | int rxrpc_send_abort_packet(struct rxrpc_call *); |
| 1365 | void rxrpc_send_data_packet(struct rxrpc_call *call, struct rxrpc_send_data_req *req); |
| 1366 | void rxrpc_send_conn_abort(struct rxrpc_connection *conn); |
| 1367 | void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb); |
| 1368 | void rxrpc_send_keepalive(struct rxrpc_peer *); |
| 1369 | void rxrpc_send_response(struct rxrpc_connection *conn, struct sk_buff *skb); |
| 1370 | |
| 1371 | /* |
| 1372 | * peer_event.c |
| 1373 | */ |
| 1374 | void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *); |
| 1375 | void rxrpc_peer_keepalive_worker(struct work_struct *); |
| 1376 | void rxrpc_input_probe_for_pmtud(struct rxrpc_connection *conn, rxrpc_serial_t acked_serial, |
| 1377 | bool sendmsg_fail); |
| 1378 | |
| 1379 | /* |
| 1380 | * peer_object.c |
| 1381 | */ |
| 1382 | struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *, |
| 1383 | const struct sockaddr_rxrpc *); |
| 1384 | struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local, |
| 1385 | struct sockaddr_rxrpc *srx, gfp_t gfp); |
| 1386 | struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t, |
| 1387 | enum rxrpc_peer_trace); |
| 1388 | void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer); |
| 1389 | void rxrpc_destroy_all_peers(struct rxrpc_net *); |
| 1390 | struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); |
| 1391 | struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace); |
| 1392 | void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace); |
| 1393 | |
| 1394 | /* |
| 1395 | * proc.c |
| 1396 | */ |
| 1397 | extern const struct seq_operations rxrpc_call_seq_ops; |
| 1398 | extern const struct seq_operations rxrpc_connection_seq_ops; |
| 1399 | extern const struct seq_operations rxrpc_bundle_seq_ops; |
| 1400 | extern const struct seq_operations rxrpc_peer_seq_ops; |
| 1401 | extern const struct seq_operations rxrpc_local_seq_ops; |
| 1402 | |
| 1403 | /* |
| 1404 | * recvmsg.c |
| 1405 | */ |
| 1406 | void rxrpc_notify_socket(struct rxrpc_call *); |
| 1407 | int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int); |
| 1408 | |
| 1409 | /* |
| 1410 | * Abort a call due to a protocol error. |
| 1411 | */ |
| 1412 | static inline int rxrpc_abort_eproto(struct rxrpc_call *call, |
| 1413 | struct sk_buff *skb, |
| 1414 | s32 abort_code, |
| 1415 | enum rxrpc_abort_reason why) |
| 1416 | { |
| 1417 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
| 1418 | |
| 1419 | rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why); |
| 1420 | return -EPROTO; |
| 1421 | } |
| 1422 | |
| 1423 | /* |
| 1424 | * rtt.c |
| 1425 | */ |
| 1426 | void rxrpc_call_add_rtt(struct rxrpc_call *call, enum rxrpc_rtt_rx_trace why, |
| 1427 | int rtt_slot, |
| 1428 | rxrpc_serial_t send_serial, rxrpc_serial_t resp_serial, |
| 1429 | ktime_t send_time, ktime_t resp_time); |
| 1430 | ktime_t rxrpc_get_rto_backoff(struct rxrpc_call *call, bool retrans); |
| 1431 | void rxrpc_call_init_rtt(struct rxrpc_call *call); |
| 1432 | |
| 1433 | /* |
| 1434 | * rxgk.c |
| 1435 | */ |
| 1436 | extern const struct rxrpc_security rxgk_yfs; |
| 1437 | |
| 1438 | /* |
| 1439 | * rxkad.c |
| 1440 | */ |
| 1441 | #ifdef CONFIG_RXKAD |
| 1442 | extern const struct rxrpc_security rxkad; |
| 1443 | #endif |
| 1444 | |
| 1445 | /* |
| 1446 | * security.c |
| 1447 | */ |
| 1448 | int __init rxrpc_init_security(void); |
| 1449 | const struct rxrpc_security *rxrpc_security_lookup(u8); |
| 1450 | void rxrpc_exit_security(void); |
| 1451 | int rxrpc_init_client_call_security(struct rxrpc_call *); |
| 1452 | int rxrpc_init_client_conn_security(struct rxrpc_connection *); |
| 1453 | const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *, |
| 1454 | struct sk_buff *); |
| 1455 | struct key *rxrpc_look_up_server_security(struct rxrpc_connection *, |
| 1456 | struct sk_buff *, u32, u32); |
| 1457 | |
| 1458 | /* |
| 1459 | * sendmsg.c |
| 1460 | */ |
| 1461 | bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error, |
| 1462 | enum rxrpc_abort_reason why); |
| 1463 | int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t); |
| 1464 | |
| 1465 | /* |
| 1466 | * server_key.c |
| 1467 | */ |
| 1468 | extern struct key_type key_type_rxrpc_s; |
| 1469 | |
| 1470 | int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int); |
| 1471 | |
| 1472 | /* |
| 1473 | * skbuff.c |
| 1474 | */ |
| 1475 | void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *); |
| 1476 | void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace); |
| 1477 | void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace); |
| 1478 | void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace); |
| 1479 | void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace); |
| 1480 | void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace); |
| 1481 | void rxrpc_purge_queue(struct sk_buff_head *); |
| 1482 | |
| 1483 | /* |
| 1484 | * stats.c |
| 1485 | */ |
| 1486 | int rxrpc_stats_show(struct seq_file *seq, void *v); |
| 1487 | int rxrpc_stats_clear(struct file *file, char *buf, size_t size); |
| 1488 | |
| 1489 | #define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s) |
| 1490 | #define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s) |
| 1491 | |
| 1492 | /* |
| 1493 | * sysctl.c |
| 1494 | */ |
| 1495 | #ifdef CONFIG_SYSCTL |
| 1496 | extern int __init rxrpc_sysctl_init(void); |
| 1497 | extern void rxrpc_sysctl_exit(void); |
| 1498 | #else |
| 1499 | static inline int __init rxrpc_sysctl_init(void) { return 0; } |
| 1500 | static inline void rxrpc_sysctl_exit(void) {} |
| 1501 | #endif |
| 1502 | |
| 1503 | /* |
| 1504 | * txbuf.c |
| 1505 | */ |
| 1506 | extern atomic_t rxrpc_nr_txbuf; |
| 1507 | struct rxrpc_txbuf *rxrpc_alloc_data_txbuf(struct rxrpc_call *call, size_t data_size, |
| 1508 | size_t data_align, gfp_t gfp); |
| 1509 | void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); |
| 1510 | void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what); |
| 1511 | |
| 1512 | /* |
| 1513 | * utils.c |
| 1514 | */ |
| 1515 | int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *); |
| 1516 | |
| 1517 | static inline bool before(u32 seq1, u32 seq2) |
| 1518 | { |
| 1519 | return (s32)(seq1 - seq2) < 0; |
| 1520 | } |
| 1521 | static inline bool before_eq(u32 seq1, u32 seq2) |
| 1522 | { |
| 1523 | return (s32)(seq1 - seq2) <= 0; |
| 1524 | } |
| 1525 | static inline bool after(u32 seq1, u32 seq2) |
| 1526 | { |
| 1527 | return (s32)(seq1 - seq2) > 0; |
| 1528 | } |
| 1529 | static inline bool after_eq(u32 seq1, u32 seq2) |
| 1530 | { |
| 1531 | return (s32)(seq1 - seq2) >= 0; |
| 1532 | } |
| 1533 | |
| 1534 | static inline u32 earliest(u32 seq1, u32 seq2) |
| 1535 | { |
| 1536 | return before(seq1, seq2) ? seq1 : seq2; |
| 1537 | } |
| 1538 | |
| 1539 | static inline u32 latest(u32 seq1, u32 seq2) |
| 1540 | { |
| 1541 | return after(seq1, seq2) ? seq1 : seq2; |
| 1542 | } |
| 1543 | |
| 1544 | static inline bool rxrpc_seq_in_txq(const struct rxrpc_txqueue *tq, rxrpc_seq_t seq) |
| 1545 | { |
| 1546 | return (seq & (RXRPC_NR_TXQUEUE - 1)) == tq->qbase; |
| 1547 | } |
| 1548 | |
| 1549 | static inline void rxrpc_queue_rx_call_packet(struct rxrpc_call *call, struct sk_buff *skb) |
| 1550 | { |
| 1551 | rxrpc_get_skb(skb, rxrpc_skb_get_call_rx); |
| 1552 | __skb_queue_tail(&call->rx_queue, skb); |
| 1553 | rxrpc_poke_call(call, rxrpc_call_poke_rx_packet); |
| 1554 | } |
| 1555 | |
| 1556 | /* |
| 1557 | * Calculate how much space there is for transmitting more DATA packets. |
| 1558 | */ |
| 1559 | static inline unsigned int rxrpc_tx_window_space(const struct rxrpc_call *call) |
| 1560 | { |
| 1561 | int winsize = umin(call->tx_winsize, call->cong_cwnd + call->cong_extra); |
| 1562 | int transmitted = call->tx_top - call->tx_bottom; |
| 1563 | |
| 1564 | return max(winsize - transmitted, 0); |
| 1565 | } |
| 1566 | |
| 1567 | static inline unsigned int rxrpc_left_out(const struct rxrpc_call *call) |
| 1568 | { |
| 1569 | return call->acks_nr_sacks + call->tx_nr_lost; |
| 1570 | } |
| 1571 | |
| 1572 | /* |
| 1573 | * Calculate the number of transmitted DATA packets assumed to be in flight |
| 1574 | * [approx RFC6675]. |
| 1575 | */ |
| 1576 | static inline unsigned int rxrpc_tx_in_flight(const struct rxrpc_call *call) |
| 1577 | { |
| 1578 | return call->tx_nr_sent - rxrpc_left_out(call) + call->tx_nr_resent; |
| 1579 | } |
| 1580 | |
| 1581 | /* |
| 1582 | * debug tracing |
| 1583 | */ |
| 1584 | extern unsigned int rxrpc_debug; |
| 1585 | |
| 1586 | #define dbgprintk(FMT,...) \ |
| 1587 | printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__) |
| 1588 | |
| 1589 | #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__) |
| 1590 | #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) |
| 1591 | #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__) |
| 1592 | |
| 1593 | |
| 1594 | #if defined(__KDEBUG) |
| 1595 | #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__) |
| 1596 | #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__) |
| 1597 | #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__) |
| 1598 | |
| 1599 | #elif defined(CONFIG_AF_RXRPC_DEBUG) |
| 1600 | #define RXRPC_DEBUG_KENTER 0x01 |
| 1601 | #define RXRPC_DEBUG_KLEAVE 0x02 |
| 1602 | #define RXRPC_DEBUG_KDEBUG 0x04 |
| 1603 | |
| 1604 | #define _enter(FMT,...) \ |
| 1605 | do { \ |
| 1606 | if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \ |
| 1607 | kenter(FMT,##__VA_ARGS__); \ |
| 1608 | } while (0) |
| 1609 | |
| 1610 | #define _leave(FMT,...) \ |
| 1611 | do { \ |
| 1612 | if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \ |
| 1613 | kleave(FMT,##__VA_ARGS__); \ |
| 1614 | } while (0) |
| 1615 | |
| 1616 | #define _debug(FMT,...) \ |
| 1617 | do { \ |
| 1618 | if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \ |
| 1619 | kdebug(FMT,##__VA_ARGS__); \ |
| 1620 | } while (0) |
| 1621 | |
| 1622 | #else |
| 1623 | #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__) |
| 1624 | #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__) |
| 1625 | #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__) |
| 1626 | #endif |
| 1627 | |
| 1628 | /* |
| 1629 | * debug assertion checking |
| 1630 | */ |
| 1631 | #if 1 // defined(__KDEBUGALL) |
| 1632 | |
| 1633 | #define ASSERT(X) \ |
| 1634 | do { \ |
| 1635 | if (unlikely(!(X))) { \ |
| 1636 | pr_err("Assertion failed\n"); \ |
| 1637 | BUG(); \ |
| 1638 | } \ |
| 1639 | } while (0) |
| 1640 | |
| 1641 | #define ASSERTCMP(X, OP, Y) \ |
| 1642 | do { \ |
| 1643 | __typeof__(X) _x = (X); \ |
| 1644 | __typeof__(Y) _y = (__typeof__(X))(Y); \ |
| 1645 | if (unlikely(!(_x OP _y))) { \ |
| 1646 | pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ |
| 1647 | (unsigned long)_x, (unsigned long)_x, #OP, \ |
| 1648 | (unsigned long)_y, (unsigned long)_y); \ |
| 1649 | BUG(); \ |
| 1650 | } \ |
| 1651 | } while (0) |
| 1652 | |
| 1653 | #define ASSERTIF(C, X) \ |
| 1654 | do { \ |
| 1655 | if (unlikely((C) && !(X))) { \ |
| 1656 | pr_err("Assertion failed\n"); \ |
| 1657 | BUG(); \ |
| 1658 | } \ |
| 1659 | } while (0) |
| 1660 | |
| 1661 | #define ASSERTIFCMP(C, X, OP, Y) \ |
| 1662 | do { \ |
| 1663 | __typeof__(X) _x = (X); \ |
| 1664 | __typeof__(Y) _y = (__typeof__(X))(Y); \ |
| 1665 | if (unlikely((C) && !(_x OP _y))) { \ |
| 1666 | pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \ |
| 1667 | (unsigned long)_x, (unsigned long)_x, #OP, \ |
| 1668 | (unsigned long)_y, (unsigned long)_y); \ |
| 1669 | BUG(); \ |
| 1670 | } \ |
| 1671 | } while (0) |
| 1672 | |
| 1673 | #else |
| 1674 | |
| 1675 | #define ASSERT(X) \ |
| 1676 | do { \ |
| 1677 | } while (0) |
| 1678 | |
| 1679 | #define ASSERTCMP(X, OP, Y) \ |
| 1680 | do { \ |
| 1681 | } while (0) |
| 1682 | |
| 1683 | #define ASSERTIF(C, X) \ |
| 1684 | do { \ |
| 1685 | } while (0) |
| 1686 | |
| 1687 | #define ASSERTIFCMP(C, X, OP, Y) \ |
| 1688 | do { \ |
| 1689 | } while (0) |
| 1690 | |
| 1691 | #endif /* __KDEBUGALL */ |