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 "protocol.h"
16
17 #if 0
18 #define CHECK_SLAB_OKAY(X) \
19 BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
20 (POISON_FREE << 8 | POISON_FREE))
21 #else
22 #define CHECK_SLAB_OKAY(X) do {} while (0)
23 #endif
24
25 #define FCRYPT_BSIZE 8
26 struct rxrpc_crypt {
27 union {
28 u8 x[FCRYPT_BSIZE];
29 __be32 n[2];
30 };
31 } __attribute__((aligned(8)));
32
33 #define rxrpc_queue_work(WS) queue_work(rxrpc_workqueue, (WS))
34 #define rxrpc_queue_delayed_work(WS,D) \
35 queue_delayed_work(rxrpc_workqueue, (WS), (D))
36
37 struct rxrpc_connection;
38
39 /*
40 * Mark applied to socket buffers in skb->mark. skb->priority is used
41 * to pass supplementary information.
42 */
43 enum rxrpc_skb_mark {
44 RXRPC_SKB_MARK_REJECT_BUSY, /* Reject with BUSY */
45 RXRPC_SKB_MARK_REJECT_ABORT, /* Reject with ABORT (code in skb->priority) */
46 };
47
48 /*
49 * sk_state for RxRPC sockets
50 */
51 enum {
52 RXRPC_UNBOUND = 0,
53 RXRPC_CLIENT_UNBOUND, /* Unbound socket used as client */
54 RXRPC_CLIENT_BOUND, /* client local address bound */
55 RXRPC_SERVER_BOUND, /* server local address bound */
56 RXRPC_SERVER_BOUND2, /* second server local address bound */
57 RXRPC_SERVER_LISTENING, /* server listening for connections */
58 RXRPC_SERVER_LISTEN_DISABLED, /* server listening disabled */
59 RXRPC_CLOSE, /* socket is being closed */
60 };
61
62 /*
63 * Per-network namespace data.
64 */
65 struct rxrpc_net {
66 struct proc_dir_entry *proc_net; /* Subdir in /proc/net */
67 u32 epoch; /* Local epoch for detecting local-end reset */
68 struct list_head calls; /* List of calls active in this namespace */
69 rwlock_t call_lock; /* Lock for ->calls */
70 atomic_t nr_calls; /* Count of allocated calls */
71
72 atomic_t nr_conns;
73 struct list_head conn_proc_list; /* List of conns in this namespace for proc */
74 struct list_head service_conns; /* Service conns in this namespace */
75 rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */
76 struct work_struct service_conn_reaper;
77 struct timer_list service_conn_reap_timer;
78
79 bool live;
80
81 bool kill_all_client_conns;
82 atomic_t nr_client_conns;
83 spinlock_t client_conn_cache_lock; /* Lock for ->*_client_conns */
84 spinlock_t client_conn_discard_lock; /* Prevent multiple discarders */
85 struct list_head idle_client_conns;
86 struct work_struct client_conn_reaper;
87 struct timer_list client_conn_reap_timer;
88
89 struct list_head local_endpoints;
90 struct mutex local_mutex; /* Lock for ->local_endpoints */
91
92 DECLARE_HASHTABLE (peer_hash, 10);
93 spinlock_t peer_hash_lock; /* Lock for ->peer_hash */
94
95 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
96 u8 peer_keepalive_cursor;
97 time64_t peer_keepalive_base;
98 struct list_head peer_keepalive[32];
99 struct list_head peer_keepalive_new;
100 struct timer_list peer_keepalive_timer;
101 struct work_struct peer_keepalive_work;
102 };
103
104 /*
105 * Service backlog preallocation.
106 *
107 * This contains circular buffers of preallocated peers, connections and calls
108 * for incoming service calls and their head and tail pointers. This allows
109 * calls to be set up in the data_ready handler, thereby avoiding the need to
110 * shuffle packets around so much.
111 */
112 struct rxrpc_backlog {
113 unsigned short peer_backlog_head;
114 unsigned short peer_backlog_tail;
115 unsigned short conn_backlog_head;
116 unsigned short conn_backlog_tail;
117 unsigned short call_backlog_head;
118 unsigned short call_backlog_tail;
119 #define RXRPC_BACKLOG_MAX 32
120 struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX];
121 struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
122 struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX];
123 };
124
125 /*
126 * RxRPC socket definition
127 */
128 struct rxrpc_sock {
129 /* WARNING: sk has to be the first member */
130 struct sock sk;
131 rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
132 rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
133 struct rxrpc_local *local; /* local endpoint */
134 struct rxrpc_backlog *backlog; /* Preallocation for services */
135 spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */
136 struct list_head sock_calls; /* List of calls owned by this socket */
137 struct list_head to_be_accepted; /* calls awaiting acceptance */
138 struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */
139 rwlock_t recvmsg_lock; /* Lock for recvmsg_q */
140 struct key *key; /* security for this socket */
141 struct key *securities; /* list of server security descriptors */
142 struct rb_root calls; /* User ID -> call mapping */
143 unsigned long flags;
144 #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */
145 rwlock_t call_lock; /* lock for calls */
146 u32 min_sec_level; /* minimum security level */
147 #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT
148 bool exclusive; /* Exclusive connection for a client socket */
149 u16 second_service; /* Additional service bound to the endpoint */
150 struct {
151 /* Service upgrade information */
152 u16 from; /* Service ID to upgrade (if not 0) */
153 u16 to; /* service ID to upgrade to */
154 } service_upgrade;
155 sa_family_t family; /* Protocol family created with */
156 struct sockaddr_rxrpc srx; /* Primary Service/local addresses */
157 struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */
158 };
159
160 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
161
162 /*
163 * CPU-byteorder normalised Rx packet header.
164 */
165 struct rxrpc_host_header {
166 u32 epoch; /* client boot timestamp */
167 u32 cid; /* connection and channel ID */
168 u32 callNumber; /* call ID (0 for connection-level packets) */
169 u32 seq; /* sequence number of pkt in call stream */
170 u32 serial; /* serial number of pkt sent to network */
171 u8 type; /* packet type */
172 u8 flags; /* packet flags */
173 u8 userStatus; /* app-layer defined status */
174 u8 securityIndex; /* security protocol ID */
175 union {
176 u16 _rsvd; /* reserved */
177 u16 cksum; /* kerberos security checksum */
178 };
179 u16 serviceId; /* service ID */
180 } __packed;
181
182 /*
183 * RxRPC socket buffer private variables
184 * - max 48 bytes (struct sk_buff::cb)
185 */
186 struct rxrpc_skb_priv {
187 atomic_t nr_ring_pins; /* Number of rxtx ring pins */
188 u8 nr_subpackets; /* Number of subpackets */
189 u8 rx_flags; /* Received packet flags */
190 #define RXRPC_SKB_INCL_LAST 0x01 /* - Includes last packet */
191 #define RXRPC_SKB_TX_BUFFER 0x02 /* - Is transmit buffer */
192 union {
193 int remain; /* amount of space remaining for next write */
194
195 /* List of requested ACKs on subpackets */
196 unsigned long rx_req_ack[(RXRPC_MAX_NR_JUMBO + BITS_PER_LONG - 1) /
197 BITS_PER_LONG];
198 };
199
200 struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */
201 };
202
203 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
204
205 /*
206 * RxRPC security module interface
207 */
208 struct rxrpc_security {
209 const char *name; /* name of this service */
210 u8 security_index; /* security type provided */
211 u32 no_key_abort; /* Abort code indicating no key */
212
213 /* Initialise a security service */
214 int (*init)(void);
215
216 /* Clean up a security service */
217 void (*exit)(void);
218
219 /* initialise a connection's security */
220 int (*init_connection_security)(struct rxrpc_connection *);
221
222 /* prime a connection's packet security */
223 int (*prime_packet_security)(struct rxrpc_connection *);
224
225 /* impose security on a packet */
226 int (*secure_packet)(struct rxrpc_call *,
227 struct sk_buff *,
228 size_t,
229 void *);
230
231 /* verify the security on a received packet */
232 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
233 unsigned int, unsigned int, rxrpc_seq_t, u16);
234
235 /* Free crypto request on a call */
236 void (*free_call_crypto)(struct rxrpc_call *);
237
238 /* Locate the data in a received packet that has been verified. */
239 void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
240 unsigned int *, unsigned int *);
241
242 /* issue a challenge */
243 int (*issue_challenge)(struct rxrpc_connection *);
244
245 /* respond to a challenge */
246 int (*respond_to_challenge)(struct rxrpc_connection *,
247 struct sk_buff *,
248 u32 *);
249
250 /* verify a response */
251 int (*verify_response)(struct rxrpc_connection *,
252 struct sk_buff *,
253 u32 *);
254
255 /* clear connection security */
256 void (*clear)(struct rxrpc_connection *);
257 };
258
259 /*
260 * RxRPC local transport endpoint description
261 * - owned by a single AF_RXRPC socket
262 * - pointed to by transport socket struct sk_user_data
263 */
264 struct rxrpc_local {
265 struct rcu_head rcu;
266 atomic_t active_users; /* Number of users of the local endpoint */
267 atomic_t usage; /* Number of references to the structure */
268 struct rxrpc_net *rxnet; /* The network ns in which this resides */
269 struct list_head link;
270 struct socket *socket; /* my UDP socket */
271 struct work_struct processor;
272 struct rxrpc_sock __rcu *service; /* Service(s) listening on this endpoint */
273 struct rw_semaphore defrag_sem; /* control re-enablement of IP DF bit */
274 struct sk_buff_head reject_queue; /* packets awaiting rejection */
275 struct sk_buff_head event_queue; /* endpoint event packets awaiting processing */
276 struct rb_root client_bundles; /* Client connection bundles by socket params */
277 spinlock_t client_bundles_lock; /* Lock for client_bundles */
278 spinlock_t lock; /* access lock */
279 rwlock_t services_lock; /* lock for services list */
280 int debug_id; /* debug ID for printks */
281 bool dead;
282 bool service_closed; /* Service socket closed */
283 struct sockaddr_rxrpc srx; /* local address */
284 };
285
286 /*
287 * RxRPC remote transport endpoint definition
288 * - matched by local endpoint, remote port, address and protocol type
289 */
290 struct rxrpc_peer {
291 struct rcu_head rcu; /* This must be first */
292 atomic_t usage;
293 unsigned long hash_key;
294 struct hlist_node hash_link;
295 struct rxrpc_local *local;
296 struct hlist_head error_targets; /* targets for net error distribution */
297 struct rb_root service_conns; /* Service connections */
298 struct list_head keepalive_link; /* Link in net->peer_keepalive[] */
299 time64_t last_tx_at; /* Last time packet sent here */
300 seqlock_t service_conn_lock;
301 spinlock_t lock; /* access lock */
302 unsigned int if_mtu; /* interface MTU for this peer */
303 unsigned int mtu; /* network MTU for this peer */
304 unsigned int maxdata; /* data size (MTU - hdrsize) */
305 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */
306 int debug_id; /* debug ID for printks */
307 struct sockaddr_rxrpc srx; /* remote address */
308
309 /* calculated RTT cache */
310 #define RXRPC_RTT_CACHE_SIZE 32
311 spinlock_t rtt_input_lock; /* RTT lock for input routine */
312 ktime_t rtt_last_req; /* Time of last RTT request */
313 unsigned int rtt_count; /* Number of samples we've got */
314
315 u32 srtt_us; /* smoothed round trip time << 3 in usecs */
316 u32 mdev_us; /* medium deviation */
317 u32 mdev_max_us; /* maximal mdev for the last rtt period */
318 u32 rttvar_us; /* smoothed mdev_max */
319 u32 rto_j; /* Retransmission timeout in jiffies */
320 u8 backoff; /* Backoff timeout */
321
322 u8 cong_cwnd; /* Congestion window size */
323 };
324
325 /*
326 * Keys for matching a connection.
327 */
328 struct rxrpc_conn_proto {
329 union {
330 struct {
331 u32 epoch; /* epoch of this connection */
332 u32 cid; /* connection ID */
333 };
334 u64 index_key;
335 };
336 };
337
338 struct rxrpc_conn_parameters {
339 struct rxrpc_local *local; /* Representation of local endpoint */
340 struct rxrpc_peer *peer; /* Remote endpoint */
341 struct key *key; /* Security details */
342 bool exclusive; /* T if conn is exclusive */
343 bool upgrade; /* T if service ID can be upgraded */
344 u16 service_id; /* Service ID for this connection */
345 u32 security_level; /* Security level selected */
346 };
347
348 /*
349 * Bits in the connection flags.
350 */
351 enum rxrpc_conn_flag {
352 RXRPC_CONN_HAS_IDR, /* Has a client conn ID assigned */
353 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */
354 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */
355 RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */
356 RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */
357 RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */
358 RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */
359 RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */
360 };
361
362 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \
363 (1UL << RXRPC_CONN_FINAL_ACK_1) | \
364 (1UL << RXRPC_CONN_FINAL_ACK_2) | \
365 (1UL << RXRPC_CONN_FINAL_ACK_3))
366
367 /*
368 * Events that can be raised upon a connection.
369 */
370 enum rxrpc_conn_event {
371 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */
372 };
373
374 /*
375 * The connection protocol state.
376 */
377 enum rxrpc_conn_proto_state {
378 RXRPC_CONN_UNUSED, /* Connection not yet attempted */
379 RXRPC_CONN_CLIENT, /* Client connection */
380 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */
381 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */
382 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
383 RXRPC_CONN_SERVICE, /* Service secured connection */
384 RXRPC_CONN_REMOTELY_ABORTED, /* Conn aborted by peer */
385 RXRPC_CONN_LOCALLY_ABORTED, /* Conn aborted locally */
386 RXRPC_CONN__NR_STATES
387 };
388
389 /*
390 * RxRPC client connection bundle.
391 */
392 struct rxrpc_bundle {
393 struct rxrpc_conn_parameters params;
394 atomic_t usage;
395 unsigned int debug_id;
396 bool try_upgrade; /* True if the bundle is attempting upgrade */
397 bool alloc_conn; /* True if someone's getting a conn */
398 short alloc_error; /* Error from last conn allocation */
399 spinlock_t channel_lock;
400 struct rb_node local_node; /* Node in local->client_conns */
401 struct list_head waiting_calls; /* Calls waiting for channels */
402 unsigned long avail_chans; /* Mask of available channels */
403 struct rxrpc_connection *conns[4]; /* The connections in the bundle (max 4) */
404 };
405
406 /*
407 * RxRPC connection definition
408 * - matched by { local, peer, epoch, conn_id, direction }
409 * - each connection can only handle four simultaneous calls
410 */
411 struct rxrpc_connection {
412 struct rxrpc_conn_proto proto;
413 struct rxrpc_conn_parameters params;
414
415 atomic_t usage;
416 struct rcu_head rcu;
417 struct list_head cache_link;
418
419 unsigned char act_chans; /* Mask of active channels */
420 struct rxrpc_channel {
421 unsigned long final_ack_at; /* Time at which to issue final ACK */
422 struct rxrpc_call __rcu *call; /* Active call */
423 unsigned int call_debug_id; /* call->debug_id */
424 u32 call_id; /* ID of current call */
425 u32 call_counter; /* Call ID counter */
426 u32 last_call; /* ID of last call */
427 u8 last_type; /* Type of last packet */
428 union {
429 u32 last_seq;
430 u32 last_abort;
431 };
432 } channels[RXRPC_MAXCALLS];
433
434 struct timer_list timer; /* Conn event timer */
435 struct work_struct processor; /* connection event processor */
436 struct rxrpc_bundle *bundle; /* Client connection bundle */
437 struct rb_node service_node; /* Node in peer->service_conns */
438 struct list_head proc_link; /* link in procfs list */
439 struct list_head link; /* link in master connection list */
440 struct sk_buff_head rx_queue; /* received conn-level packets */
441 const struct rxrpc_security *security; /* applied security module */
442 struct key *server_key; /* security for this service */
443 struct crypto_sync_skcipher *cipher; /* encryption handle */
444 struct rxrpc_crypt csum_iv; /* packet checksum base */
445 unsigned long flags;
446 unsigned long events;
447 unsigned long idle_timestamp; /* Time at which last became idle */
448 spinlock_t state_lock; /* state-change lock */
449 enum rxrpc_conn_proto_state state; /* current state of connection */
450 u32 abort_code; /* Abort code of connection abort */
451 int debug_id; /* debug ID for printks */
452 atomic_t serial; /* packet serial number counter */
453 unsigned int hi_serial; /* highest serial number received */
454 u32 security_nonce; /* response re-use preventer */
455 u32 service_id; /* Service ID, possibly upgraded */
456 u8 size_align; /* data size alignment (for security) */
457 u8 security_size; /* security header size */
458 u8 security_ix; /* security type */
459 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
460 u8 bundle_shift; /* Index into bundle->avail_chans */
461 short error; /* Local error code */
462 };
463
rxrpc_to_server(const struct rxrpc_skb_priv * sp)464 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
465 {
466 return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
467 }
468
rxrpc_to_client(const struct rxrpc_skb_priv * sp)469 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
470 {
471 return !rxrpc_to_server(sp);
472 }
473
474 /*
475 * Flags in call->flags.
476 */
477 enum rxrpc_call_flag {
478 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */
479 RXRPC_CALL_HAS_USERID, /* has a user ID attached */
480 RXRPC_CALL_IS_SERVICE, /* Call is service call */
481 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */
482 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */
483 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */
484 RXRPC_CALL_SEND_PING, /* A ping will need to be sent */
485 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */
486 RXRPC_CALL_BEGAN_RX_TIMER, /* We began the expect_rx_by timer */
487 RXRPC_CALL_RX_HEARD, /* The peer responded at least once to this call */
488 RXRPC_CALL_RX_UNDERRUN, /* Got data underrun */
489 RXRPC_CALL_DISCONNECTED, /* The call has been disconnected */
490 RXRPC_CALL_KERNEL, /* The call was made by the kernel */
491 RXRPC_CALL_UPGRADE, /* Service upgrade was requested for the call */
492 };
493
494 /*
495 * Events that can be raised on a call.
496 */
497 enum rxrpc_call_event {
498 RXRPC_CALL_EV_ACK, /* need to generate ACK */
499 RXRPC_CALL_EV_ABORT, /* need to generate abort */
500 RXRPC_CALL_EV_RESEND, /* Tx resend required */
501 RXRPC_CALL_EV_PING, /* Ping send required */
502 RXRPC_CALL_EV_EXPIRED, /* Expiry occurred */
503 RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */
504 };
505
506 /*
507 * The states that a call can be in.
508 */
509 enum rxrpc_call_state {
510 RXRPC_CALL_UNINITIALISED,
511 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */
512 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
513 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */
514 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */
515 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */
516 RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */
517 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
518 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */
519 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */
520 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */
521 RXRPC_CALL_COMPLETE, /* - call complete */
522 NR__RXRPC_CALL_STATES
523 };
524
525 /*
526 * Call completion condition (state == RXRPC_CALL_COMPLETE).
527 */
528 enum rxrpc_call_completion {
529 RXRPC_CALL_SUCCEEDED, /* - Normal termination */
530 RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */
531 RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */
532 RXRPC_CALL_LOCAL_ERROR, /* - call failed due to local error */
533 RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */
534 NR__RXRPC_CALL_COMPLETIONS
535 };
536
537 /*
538 * Call Tx congestion management modes.
539 */
540 enum rxrpc_congest_mode {
541 RXRPC_CALL_SLOW_START,
542 RXRPC_CALL_CONGEST_AVOIDANCE,
543 RXRPC_CALL_PACKET_LOSS,
544 RXRPC_CALL_FAST_RETRANSMIT,
545 NR__RXRPC_CONGEST_MODES
546 };
547
548 /*
549 * RxRPC call definition
550 * - matched by { connection, call_id }
551 */
552 struct rxrpc_call {
553 struct rcu_head rcu;
554 struct rxrpc_connection *conn; /* connection carrying call */
555 struct rxrpc_peer *peer; /* Peer record for remote address */
556 struct rxrpc_sock __rcu *socket; /* socket responsible */
557 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */
558 const struct rxrpc_security *security; /* applied security module */
559 struct mutex user_mutex; /* User access mutex */
560 unsigned long ack_at; /* When deferred ACK needs to happen */
561 unsigned long ack_lost_at; /* When ACK is figured as lost */
562 unsigned long resend_at; /* When next resend needs to happen */
563 unsigned long ping_at; /* When next to send a ping */
564 unsigned long keepalive_at; /* When next to send a keepalive ping */
565 unsigned long expect_rx_by; /* When we expect to get a packet by */
566 unsigned long expect_req_by; /* When we expect to get a request DATA packet by */
567 unsigned long expect_term_by; /* When we expect call termination by */
568 u32 next_rx_timo; /* Timeout for next Rx packet (jif) */
569 u32 next_req_timo; /* Timeout for next Rx request packet (jif) */
570 struct skcipher_request *cipher_req; /* Packet cipher request buffer */
571 struct timer_list timer; /* Combined event timer */
572 struct work_struct processor; /* Event processor */
573 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */
574 struct list_head link; /* link in master call list */
575 struct list_head chan_wait_link; /* Link in conn->bundle->waiting_calls */
576 struct hlist_node error_link; /* link in error distribution list */
577 struct list_head accept_link; /* Link in rx->acceptq */
578 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */
579 struct list_head sock_link; /* Link in rx->sock_calls */
580 struct rb_node sock_node; /* Node in rx->calls */
581 struct sk_buff *tx_pending; /* Tx socket buffer being filled */
582 wait_queue_head_t waitq; /* Wait queue for channel or Tx */
583 s64 tx_total_len; /* Total length left to be transmitted (or -1) */
584 __be32 crypto_buf[2]; /* Temporary packet crypto buffer */
585 unsigned long user_call_ID; /* user-defined call ID */
586 unsigned long flags;
587 unsigned long events;
588 spinlock_t lock;
589 spinlock_t notify_lock; /* Kernel notification lock */
590 rwlock_t state_lock; /* lock for state transition */
591 u32 abort_code; /* Local/remote abort code */
592 int error; /* Local error incurred */
593 enum rxrpc_call_state state; /* current state of call */
594 enum rxrpc_call_completion completion; /* Call completion condition */
595 atomic_t usage;
596 u16 service_id; /* service ID */
597 u8 security_ix; /* Security type */
598 enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */
599 u32 call_id; /* call ID on connection */
600 u32 cid; /* connection ID plus channel index */
601 int debug_id; /* debug ID for printks */
602 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */
603 unsigned short rx_pkt_len; /* Current recvmsg packet len */
604 bool rx_pkt_last; /* Current recvmsg packet is last */
605
606 /* Rx/Tx circular buffer, depending on phase.
607 *
608 * In the Rx phase, packets are annotated with 0 or the number of the
609 * segment of a jumbo packet each buffer refers to. There can be up to
610 * 47 segments in a maximum-size UDP packet.
611 *
612 * In the Tx phase, packets are annotated with which buffers have been
613 * acked.
614 */
615 #define RXRPC_RXTX_BUFF_SIZE 64
616 #define RXRPC_RXTX_BUFF_MASK (RXRPC_RXTX_BUFF_SIZE - 1)
617 #define RXRPC_INIT_RX_WINDOW_SIZE 63
618 struct sk_buff **rxtx_buffer;
619 u8 *rxtx_annotations;
620 #define RXRPC_TX_ANNO_ACK 0
621 #define RXRPC_TX_ANNO_UNACK 1
622 #define RXRPC_TX_ANNO_NAK 2
623 #define RXRPC_TX_ANNO_RETRANS 3
624 #define RXRPC_TX_ANNO_MASK 0x03
625 #define RXRPC_TX_ANNO_LAST 0x04
626 #define RXRPC_TX_ANNO_RESENT 0x08
627
628 #define RXRPC_RX_ANNO_SUBPACKET 0x3f /* Subpacket number in jumbogram */
629 #define RXRPC_RX_ANNO_VERIFIED 0x80 /* Set if verified and decrypted */
630 rxrpc_seq_t tx_hard_ack; /* Dead slot in buffer; the first transmitted but
631 * not hard-ACK'd packet follows this.
632 */
633 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */
634 u16 tx_backoff; /* Delay to insert due to Tx failure */
635
636 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS
637 * is fixed, we keep these numbers in terms of segments (ie. DATA
638 * packets) rather than bytes.
639 */
640 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN
641 u8 cong_cwnd; /* Congestion window size */
642 u8 cong_extra; /* Extra to send for congestion management */
643 u8 cong_ssthresh; /* Slow-start threshold */
644 enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */
645 u8 cong_dup_acks; /* Count of ACKs showing missing packets */
646 u8 cong_cumul_acks; /* Cumulative ACK count */
647 ktime_t cong_tstamp; /* Last time cwnd was changed */
648
649 rxrpc_seq_t rx_hard_ack; /* Dead slot in buffer; the first received but not
650 * consumed packet follows this.
651 */
652 rxrpc_seq_t rx_top; /* Highest Rx slot allocated. */
653 rxrpc_seq_t rx_expect_next; /* Expected next packet sequence number */
654 rxrpc_serial_t rx_serial; /* Highest serial received for this call */
655 u8 rx_winsize; /* Size of Rx window */
656 u8 tx_winsize; /* Maximum size of Tx window */
657 bool tx_phase; /* T if transmission phase, F if receive phase */
658 u8 nr_jumbo_bad; /* Number of jumbo dups/exceeds-windows */
659
660 spinlock_t input_lock; /* Lock for packet input to this call */
661
662 /* receive-phase ACK management */
663 u8 ackr_reason; /* reason to ACK */
664 rxrpc_serial_t ackr_serial; /* serial of packet being ACK'd */
665 rxrpc_serial_t ackr_first_seq; /* first sequence number received */
666 rxrpc_seq_t ackr_prev_seq; /* previous sequence number received */
667 rxrpc_seq_t ackr_consumed; /* Highest packet shown consumed */
668 rxrpc_seq_t ackr_seen; /* Highest packet shown seen */
669
670 /* RTT management */
671 rxrpc_serial_t rtt_serial[4]; /* Serial number of DATA or PING sent */
672 ktime_t rtt_sent_at[4]; /* Time packet sent */
673 unsigned long rtt_avail; /* Mask of available slots in bits 0-3,
674 * Mask of pending samples in 8-11 */
675 #define RXRPC_CALL_RTT_AVAIL_MASK 0xf
676 #define RXRPC_CALL_RTT_PEND_SHIFT 8
677
678 /* transmission-phase ACK management */
679 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */
680 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
681 rxrpc_seq_t acks_lost_top; /* tx_top at the time lost-ack ping sent */
682 rxrpc_serial_t acks_lost_ping; /* Serial number of probe ACK */
683 };
684
685 /*
686 * Summary of a new ACK and the changes it made to the Tx buffer packet states.
687 */
688 struct rxrpc_ack_summary {
689 u8 ack_reason;
690 u8 nr_acks; /* Number of ACKs in packet */
691 u8 nr_nacks; /* Number of NACKs in packet */
692 u8 nr_new_acks; /* Number of new ACKs in packet */
693 u8 nr_new_nacks; /* Number of new NACKs in packet */
694 u8 nr_rot_new_acks; /* Number of rotated new ACKs */
695 bool new_low_nack; /* T if new low NACK found */
696 bool retrans_timeo; /* T if reTx due to timeout happened */
697 u8 flight_size; /* Number of unreceived transmissions */
698 /* Place to stash values for tracing */
699 enum rxrpc_congest_mode mode:8;
700 u8 cwnd;
701 u8 ssthresh;
702 u8 dup_acks;
703 u8 cumulative_acks;
704 };
705
706 /*
707 * sendmsg() cmsg-specified parameters.
708 */
709 enum rxrpc_command {
710 RXRPC_CMD_SEND_DATA, /* send data message */
711 RXRPC_CMD_SEND_ABORT, /* request abort generation */
712 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */
713 RXRPC_CMD_CHARGE_ACCEPT, /* [server] charge accept preallocation */
714 };
715
716 struct rxrpc_call_params {
717 s64 tx_total_len; /* Total Tx data length (if send data) */
718 unsigned long user_call_ID; /* User's call ID */
719 struct {
720 u32 hard; /* Maximum lifetime (sec) */
721 u32 idle; /* Max time since last data packet (msec) */
722 u32 normal; /* Max time since last call packet (msec) */
723 } timeouts;
724 u8 nr_timeouts; /* Number of timeouts specified */
725 bool kernel; /* T if kernel is making the call */
726 enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */
727 };
728
729 struct rxrpc_send_params {
730 struct rxrpc_call_params call;
731 u32 abort_code; /* Abort code to Tx (if abort) */
732 enum rxrpc_command command : 8; /* The command to implement */
733 bool exclusive; /* Shared or exclusive call */
734 bool upgrade; /* If the connection is upgradeable */
735 };
736
737 #include <trace/events/rxrpc.h>
738
739 /*
740 * af_rxrpc.c
741 */
742 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
743 extern struct workqueue_struct *rxrpc_workqueue;
744
745 /*
746 * call_accept.c
747 */
748 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
749 void rxrpc_discard_prealloc(struct rxrpc_sock *);
750 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
751 struct rxrpc_sock *,
752 struct sk_buff *);
753 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
754 int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long);
755
756 /*
757 * call_event.c
758 */
759 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u32, bool, bool,
760 enum rxrpc_propose_ack_trace);
761 void rxrpc_process_call(struct work_struct *);
762
rxrpc_reduce_call_timer(struct rxrpc_call * call,unsigned long expire_at,unsigned long now,enum rxrpc_timer_trace why)763 static inline void rxrpc_reduce_call_timer(struct rxrpc_call *call,
764 unsigned long expire_at,
765 unsigned long now,
766 enum rxrpc_timer_trace why)
767 {
768 trace_rxrpc_timer(call, why, now);
769 timer_reduce(&call->timer, expire_at);
770 }
771
772 /*
773 * call_object.c
774 */
775 extern const char *const rxrpc_call_states[];
776 extern const char *const rxrpc_call_completions[];
777 extern unsigned int rxrpc_max_call_lifetime;
778 extern struct kmem_cache *rxrpc_call_jar;
779
780 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
781 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
782 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
783 struct rxrpc_conn_parameters *,
784 struct sockaddr_rxrpc *,
785 struct rxrpc_call_params *, gfp_t,
786 unsigned int);
787 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
788 struct sk_buff *);
789 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
790 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
791 bool __rxrpc_queue_call(struct rxrpc_call *);
792 bool rxrpc_queue_call(struct rxrpc_call *);
793 void rxrpc_see_call(struct rxrpc_call *);
794 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
795 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
796 void rxrpc_cleanup_call(struct rxrpc_call *);
797 void rxrpc_destroy_all_calls(struct rxrpc_net *);
798
rxrpc_is_service_call(const struct rxrpc_call * call)799 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
800 {
801 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
802 }
803
rxrpc_is_client_call(const struct rxrpc_call * call)804 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
805 {
806 return !rxrpc_is_service_call(call);
807 }
808
809 /*
810 * conn_client.c
811 */
812 extern unsigned int rxrpc_reap_client_connections;
813 extern unsigned long rxrpc_conn_idle_client_expiry;
814 extern unsigned long rxrpc_conn_idle_client_fast_expiry;
815 extern struct idr rxrpc_client_conn_ids;
816
817 void rxrpc_destroy_client_conn_ids(void);
818 struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *);
819 void rxrpc_put_bundle(struct rxrpc_bundle *);
820 int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_call *,
821 struct rxrpc_conn_parameters *, struct sockaddr_rxrpc *,
822 gfp_t);
823 void rxrpc_expose_client_call(struct rxrpc_call *);
824 void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *);
825 void rxrpc_put_client_conn(struct rxrpc_connection *);
826 void rxrpc_discard_expired_client_conns(struct work_struct *);
827 void rxrpc_destroy_all_client_connections(struct rxrpc_net *);
828 void rxrpc_clean_up_local_conns(struct rxrpc_local *);
829
830 /*
831 * conn_event.c
832 */
833 void rxrpc_process_connection(struct work_struct *);
834 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool);
835
836 /*
837 * conn_object.c
838 */
839 extern unsigned int rxrpc_connection_expiry;
840 extern unsigned int rxrpc_closed_conn_expiry;
841
842 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
843 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
844 struct sk_buff *,
845 struct rxrpc_peer **);
846 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
847 void rxrpc_disconnect_call(struct rxrpc_call *);
848 void rxrpc_kill_connection(struct rxrpc_connection *);
849 bool rxrpc_queue_conn(struct rxrpc_connection *);
850 void rxrpc_see_connection(struct rxrpc_connection *);
851 struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *);
852 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
853 void rxrpc_put_service_conn(struct rxrpc_connection *);
854 void rxrpc_service_connection_reaper(struct work_struct *);
855 void rxrpc_destroy_all_connections(struct rxrpc_net *);
856
rxrpc_conn_is_client(const struct rxrpc_connection * conn)857 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
858 {
859 return conn->out_clientflag;
860 }
861
rxrpc_conn_is_service(const struct rxrpc_connection * conn)862 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
863 {
864 return !rxrpc_conn_is_client(conn);
865 }
866
rxrpc_put_connection(struct rxrpc_connection * conn)867 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
868 {
869 if (!conn)
870 return;
871
872 if (rxrpc_conn_is_client(conn))
873 rxrpc_put_client_conn(conn);
874 else
875 rxrpc_put_service_conn(conn);
876 }
877
rxrpc_reduce_conn_timer(struct rxrpc_connection * conn,unsigned long expire_at)878 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
879 unsigned long expire_at)
880 {
881 timer_reduce(&conn->timer, expire_at);
882 }
883
884 /*
885 * conn_service.c
886 */
887 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
888 struct sk_buff *);
889 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
890 void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *,
891 const struct rxrpc_security *, struct key *,
892 struct sk_buff *);
893 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
894
895 /*
896 * input.c
897 */
898 int rxrpc_input_packet(struct sock *, struct sk_buff *);
899
900 /*
901 * insecure.c
902 */
903 extern const struct rxrpc_security rxrpc_no_security;
904
905 /*
906 * key.c
907 */
908 extern struct key_type key_type_rxrpc;
909 extern struct key_type key_type_rxrpc_s;
910
911 int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int);
912 int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int);
913 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
914 u32);
915
916 /*
917 * local_event.c
918 */
919 extern void rxrpc_process_local_events(struct rxrpc_local *);
920
921 /*
922 * local_object.c
923 */
924 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
925 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *);
926 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *);
927 void rxrpc_put_local(struct rxrpc_local *);
928 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *);
929 void rxrpc_unuse_local(struct rxrpc_local *);
930 void rxrpc_queue_local(struct rxrpc_local *);
931 void rxrpc_destroy_all_locals(struct rxrpc_net *);
932
__rxrpc_unuse_local(struct rxrpc_local * local)933 static inline bool __rxrpc_unuse_local(struct rxrpc_local *local)
934 {
935 return atomic_dec_return(&local->active_users) == 0;
936 }
937
__rxrpc_use_local(struct rxrpc_local * local)938 static inline bool __rxrpc_use_local(struct rxrpc_local *local)
939 {
940 return atomic_fetch_add_unless(&local->active_users, 1, 0) != 0;
941 }
942
943 /*
944 * misc.c
945 */
946 extern unsigned int rxrpc_max_backlog __read_mostly;
947 extern unsigned long rxrpc_requested_ack_delay;
948 extern unsigned long rxrpc_soft_ack_delay;
949 extern unsigned long rxrpc_idle_ack_delay;
950 extern unsigned int rxrpc_rx_window_size;
951 extern unsigned int rxrpc_rx_mtu;
952 extern unsigned int rxrpc_rx_jumbo_max;
953
954 extern const s8 rxrpc_ack_priority[];
955
956 /*
957 * net_ns.c
958 */
959 extern unsigned int rxrpc_net_id;
960 extern struct pernet_operations rxrpc_net_ops;
961
rxrpc_net(struct net * net)962 static inline struct rxrpc_net *rxrpc_net(struct net *net)
963 {
964 return net_generic(net, rxrpc_net_id);
965 }
966
967 /*
968 * output.c
969 */
970 int rxrpc_send_ack_packet(struct rxrpc_call *, bool, rxrpc_serial_t *);
971 int rxrpc_send_abort_packet(struct rxrpc_call *);
972 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
973 void rxrpc_reject_packets(struct rxrpc_local *);
974 void rxrpc_send_keepalive(struct rxrpc_peer *);
975
976 /*
977 * peer_event.c
978 */
979 void rxrpc_error_report(struct sock *);
980 void rxrpc_peer_keepalive_worker(struct work_struct *);
981
982 /*
983 * peer_object.c
984 */
985 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
986 const struct sockaddr_rxrpc *);
987 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *, struct rxrpc_local *,
988 struct sockaddr_rxrpc *, gfp_t);
989 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
990 void rxrpc_new_incoming_peer(struct rxrpc_sock *, struct rxrpc_local *,
991 struct rxrpc_peer *);
992 void rxrpc_destroy_all_peers(struct rxrpc_net *);
993 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *);
994 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *);
995 void rxrpc_put_peer(struct rxrpc_peer *);
996 void rxrpc_put_peer_locked(struct rxrpc_peer *);
997
998 /*
999 * proc.c
1000 */
1001 extern const struct seq_operations rxrpc_call_seq_ops;
1002 extern const struct seq_operations rxrpc_connection_seq_ops;
1003 extern const struct seq_operations rxrpc_peer_seq_ops;
1004
1005 /*
1006 * recvmsg.c
1007 */
1008 void rxrpc_notify_socket(struct rxrpc_call *);
1009 bool __rxrpc_set_call_completion(struct rxrpc_call *, enum rxrpc_call_completion, u32, int);
1010 bool rxrpc_set_call_completion(struct rxrpc_call *, enum rxrpc_call_completion, u32, int);
1011 bool __rxrpc_call_completed(struct rxrpc_call *);
1012 bool rxrpc_call_completed(struct rxrpc_call *);
1013 bool __rxrpc_abort_call(const char *, struct rxrpc_call *, rxrpc_seq_t, u32, int);
1014 bool rxrpc_abort_call(const char *, struct rxrpc_call *, rxrpc_seq_t, u32, int);
1015 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1016
1017 /*
1018 * Abort a call due to a protocol error.
1019 */
__rxrpc_abort_eproto(struct rxrpc_call * call,struct sk_buff * skb,const char * eproto_why,const char * why,u32 abort_code)1020 static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
1021 struct sk_buff *skb,
1022 const char *eproto_why,
1023 const char *why,
1024 u32 abort_code)
1025 {
1026 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
1027
1028 trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
1029 return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
1030 }
1031
1032 #define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
1033 __rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
1034 (abort_why), (abort_code))
1035
1036 /*
1037 * rtt.c
1038 */
1039 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, int,
1040 rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1041 unsigned long rxrpc_get_rto_backoff(struct rxrpc_peer *, bool);
1042 void rxrpc_peer_init_rtt(struct rxrpc_peer *);
1043
1044 /*
1045 * rxkad.c
1046 */
1047 #ifdef CONFIG_RXKAD
1048 extern const struct rxrpc_security rxkad;
1049 #endif
1050
1051 /*
1052 * security.c
1053 */
1054 int __init rxrpc_init_security(void);
1055 void rxrpc_exit_security(void);
1056 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1057 bool rxrpc_look_up_server_security(struct rxrpc_local *, struct rxrpc_sock *,
1058 const struct rxrpc_security **, struct key **,
1059 struct sk_buff *);
1060
1061 /*
1062 * sendmsg.c
1063 */
1064 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1065
1066 /*
1067 * skbuff.c
1068 */
1069 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1070 void rxrpc_packet_destructor(struct sk_buff *);
1071 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1072 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1073 void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace);
1074 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1075 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1076 void rxrpc_purge_queue(struct sk_buff_head *);
1077
1078 /*
1079 * sysctl.c
1080 */
1081 #ifdef CONFIG_SYSCTL
1082 extern int __init rxrpc_sysctl_init(void);
1083 extern void rxrpc_sysctl_exit(void);
1084 #else
rxrpc_sysctl_init(void)1085 static inline int __init rxrpc_sysctl_init(void) { return 0; }
rxrpc_sysctl_exit(void)1086 static inline void rxrpc_sysctl_exit(void) {}
1087 #endif
1088
1089 /*
1090 * utils.c
1091 */
1092 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1093
before(u32 seq1,u32 seq2)1094 static inline bool before(u32 seq1, u32 seq2)
1095 {
1096 return (s32)(seq1 - seq2) < 0;
1097 }
before_eq(u32 seq1,u32 seq2)1098 static inline bool before_eq(u32 seq1, u32 seq2)
1099 {
1100 return (s32)(seq1 - seq2) <= 0;
1101 }
after(u32 seq1,u32 seq2)1102 static inline bool after(u32 seq1, u32 seq2)
1103 {
1104 return (s32)(seq1 - seq2) > 0;
1105 }
after_eq(u32 seq1,u32 seq2)1106 static inline bool after_eq(u32 seq1, u32 seq2)
1107 {
1108 return (s32)(seq1 - seq2) >= 0;
1109 }
1110
1111 /*
1112 * debug tracing
1113 */
1114 extern unsigned int rxrpc_debug;
1115
1116 #define dbgprintk(FMT,...) \
1117 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1118
1119 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1120 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1121 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1122 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
1123 #define knet(FMT,...) dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1124
1125
1126 #if defined(__KDEBUG)
1127 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1128 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1129 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1130 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
1131 #define _net(FMT,...) knet(FMT,##__VA_ARGS__)
1132
1133 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1134 #define RXRPC_DEBUG_KENTER 0x01
1135 #define RXRPC_DEBUG_KLEAVE 0x02
1136 #define RXRPC_DEBUG_KDEBUG 0x04
1137 #define RXRPC_DEBUG_KPROTO 0x08
1138 #define RXRPC_DEBUG_KNET 0x10
1139
1140 #define _enter(FMT,...) \
1141 do { \
1142 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1143 kenter(FMT,##__VA_ARGS__); \
1144 } while (0)
1145
1146 #define _leave(FMT,...) \
1147 do { \
1148 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1149 kleave(FMT,##__VA_ARGS__); \
1150 } while (0)
1151
1152 #define _debug(FMT,...) \
1153 do { \
1154 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1155 kdebug(FMT,##__VA_ARGS__); \
1156 } while (0)
1157
1158 #define _proto(FMT,...) \
1159 do { \
1160 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
1161 kproto(FMT,##__VA_ARGS__); \
1162 } while (0)
1163
1164 #define _net(FMT,...) \
1165 do { \
1166 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET)) \
1167 knet(FMT,##__VA_ARGS__); \
1168 } while (0)
1169
1170 #else
1171 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1172 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1173 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1174 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
1175 #define _net(FMT,...) no_printk("@@@ "FMT ,##__VA_ARGS__)
1176 #endif
1177
1178 /*
1179 * debug assertion checking
1180 */
1181 #if 1 // defined(__KDEBUGALL)
1182
1183 #define ASSERT(X) \
1184 do { \
1185 if (unlikely(!(X))) { \
1186 pr_err("Assertion failed\n"); \
1187 BUG(); \
1188 } \
1189 } while (0)
1190
1191 #define ASSERTCMP(X, OP, Y) \
1192 do { \
1193 __typeof__(X) _x = (X); \
1194 __typeof__(Y) _y = (__typeof__(X))(Y); \
1195 if (unlikely(!(_x OP _y))) { \
1196 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1197 (unsigned long)_x, (unsigned long)_x, #OP, \
1198 (unsigned long)_y, (unsigned long)_y); \
1199 BUG(); \
1200 } \
1201 } while (0)
1202
1203 #define ASSERTIF(C, X) \
1204 do { \
1205 if (unlikely((C) && !(X))) { \
1206 pr_err("Assertion failed\n"); \
1207 BUG(); \
1208 } \
1209 } while (0)
1210
1211 #define ASSERTIFCMP(C, X, OP, Y) \
1212 do { \
1213 __typeof__(X) _x = (X); \
1214 __typeof__(Y) _y = (__typeof__(X))(Y); \
1215 if (unlikely((C) && !(_x OP _y))) { \
1216 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1217 (unsigned long)_x, (unsigned long)_x, #OP, \
1218 (unsigned long)_y, (unsigned long)_y); \
1219 BUG(); \
1220 } \
1221 } while (0)
1222
1223 #else
1224
1225 #define ASSERT(X) \
1226 do { \
1227 } while (0)
1228
1229 #define ASSERTCMP(X, OP, Y) \
1230 do { \
1231 } while (0)
1232
1233 #define ASSERTIF(C, X) \
1234 do { \
1235 } while (0)
1236
1237 #define ASSERTIFCMP(C, X, OP, Y) \
1238 do { \
1239 } while (0)
1240
1241 #endif /* __KDEBUGALL */
1242
